Merge github.com:google/grpc into deprecate-c++

Conflicts:
	test/cpp/end2end/async_end2end_test.cc
	test/cpp/end2end/end2end_test.cc

59 files changed, 4731 insertions, 1412 deletions

diff --git a/src/compiler/cpp_generator.cc b/src/compiler/cpp_generator.cc
index f10824e6b0..891032343b 100644
--- a/src/compiler/cpp_generator.cc
+++ b/src/compiler/cpp_generator.cc
@@ -183,34 +183,40 @@ void PrintHeaderClientMethod(google::protobuf::io::Printer *printer,
     printer->Print(*vars,
                    "::grpc::Status $Method$(::grpc::ClientContext* context, "
                    "const $Request$& request, $Response$* response);\n");
-    printer->Print(*vars,
-                   "::grpc::ClientAsyncResponseReader< $Response$>* "
-                   "$Method$(::grpc::ClientContext* context, "
-                   "const $Request$& request, "
-                   "::grpc::CompletionQueue* cq, void* tag);\n");
+    printer->Print(
+        *vars,
+        "std::unique_ptr< ::grpc::ClientAsyncResponseReader< $Response$>> "
+        "$Method$(::grpc::ClientContext* context, "
+        "const $Request$& request, "
+        "::grpc::CompletionQueue* cq, void* tag);\n");
   } else if (ClientOnlyStreaming(method)) {
-    printer->Print(*vars,
-                   "::grpc::ClientWriter< $Request$>* $Method$("
-                   "::grpc::ClientContext* context, $Response$* response);\n");
-    printer->Print(*vars,
-                   "::grpc::ClientAsyncWriter< $Request$>* $Method$("
-                   "::grpc::ClientContext* context, $Response$* response, "
-                   "::grpc::CompletionQueue* cq, void* tag);\n");
+    printer->Print(
+        *vars,
+        "std::unique_ptr< ::grpc::ClientWriter< $Request$>> $Method$("
+        "::grpc::ClientContext* context, $Response$* response);\n");
+    printer->Print(
+        *vars,
+        "std::unique_ptr< ::grpc::ClientAsyncWriter< $Request$>> $Method$("
+        "::grpc::ClientContext* context, $Response$* response, "
+        "::grpc::CompletionQueue* cq, void* tag);\n");
   } else if (ServerOnlyStreaming(method)) {
     printer->Print(
         *vars,
-        "::grpc::ClientReader< $Response$>* $Method$("
+        "std::unique_ptr< ::grpc::ClientReader< $Response$>> $Method$("
         "::grpc::ClientContext* context, const $Request$& request);\n");
-    printer->Print(*vars,
-                   "::grpc::ClientAsyncReader< $Response$>* $Method$("
-                   "::grpc::ClientContext* context, const $Request$& request, "
-                   "::grpc::CompletionQueue* cq, void* tag);\n");
+    printer->Print(
+        *vars,
+        "std::unique_ptr< ::grpc::ClientAsyncReader< $Response$>> $Method$("
+        "::grpc::ClientContext* context, const $Request$& request, "
+        "::grpc::CompletionQueue* cq, void* tag);\n");
   } else if (BidiStreaming(method)) {
+    printer->Print(
+        *vars,
+        "std::unique_ptr< ::grpc::ClientReaderWriter< $Request$, $Response$>> "
+        "$Method$(::grpc::ClientContext* context);\n");
     printer->Print(*vars,
-                   "::grpc::ClientReaderWriter< $Request$, $Response$>* "
-                   "$Method$(::grpc::ClientContext* context);\n");
-    printer->Print(*vars,
-                   "::grpc::ClientAsyncReaderWriter< $Request$, $Response$>* "
+                   "std::unique_ptr<  ::grpc::ClientAsyncReaderWriter< "
+                   "$Request$, $Response$>> "
                    "$Method$(::grpc::ClientContext* context, "
                    "::grpc::CompletionQueue* cq, void* tag);\n");
   }
@@ -309,7 +315,8 @@ void PrintHeaderService(google::protobuf::io::Printer *printer,
   printer->Outdent();
   printer->Print("};\n");
   printer->Print(
-      "static Stub* NewStub(const std::shared_ptr< ::grpc::ChannelInterface>& "
+      "static std::unique_ptr<Stub> NewStub(const std::shared_ptr< "
+      "::grpc::ChannelInterface>& "
       "channel);\n");
 
   printer->Print("\n");
@@ -380,91 +387,101 @@ void PrintSourceClientMethod(google::protobuf::io::Printer *printer,
                    "::grpc::RpcMethod($Service$_method_names[$Idx$]), "
                    "context, request, response);\n"
                    "}\n\n");
+    printer->Print(
+        *vars,
+        "std::unique_ptr< ::grpc::ClientAsyncResponseReader< $Response$>> "
+        "$Service$::Stub::$Method$(::grpc::ClientContext* context, "
+        "const $Request$& request, "
+        "::grpc::CompletionQueue* cq, void* tag) {\n");
     printer->Print(*vars,
-                   "::grpc::ClientAsyncResponseReader< $Response$>* "
-                   "$Service$::Stub::$Method$(::grpc::ClientContext* context, "
-                   "const $Request$& request, "
-                   "::grpc::CompletionQueue* cq, void* tag) {\n");
-    printer->Print(*vars,
-                   "  return new ::grpc::ClientAsyncResponseReader< $Response$>("
+                   "  return std::unique_ptr< "
+                   "::grpc::ClientAsyncResponseReader< $Response$>>(new "
+                   "::grpc::ClientAsyncResponseReader< $Response$>("
                    "channel(), cq, "
                    "::grpc::RpcMethod($Service$_method_names[$Idx$]), "
-                   "context, request, tag);\n"
+                   "context, request, tag));\n"
                    "}\n\n");
   } else if (ClientOnlyStreaming(method)) {
-    printer->Print(
-        *vars,
-        "::grpc::ClientWriter< $Request$>* $Service$::Stub::$Method$("
-        "::grpc::ClientContext* context, $Response$* response) {\n");
     printer->Print(*vars,
-                   "  return new ::grpc::ClientWriter< $Request$>("
+                   "std::unique_ptr< ::grpc::ClientWriter< $Request$>> "
+                   "$Service$::Stub::$Method$("
+                   "::grpc::ClientContext* context, $Response$* response) {\n");
+    printer->Print(*vars,
+                   "  return std::unique_ptr< ::grpc::ClientWriter< "
+                   "$Request$>>(new ::grpc::ClientWriter< $Request$>("
                    "channel(),"
                    "::grpc::RpcMethod($Service$_method_names[$Idx$], "
                    "::grpc::RpcMethod::RpcType::CLIENT_STREAMING), "
-                   "context, response);\n"
+                   "context, response));\n"
                    "}\n\n");
-    printer->Print(
-        *vars,
-        "::grpc::ClientAsyncWriter< $Request$>* $Service$::Stub::$Method$("
-        "::grpc::ClientContext* context, $Response$* response, "
-        "::grpc::CompletionQueue* cq, void* tag) {\n");
     printer->Print(*vars,
-                   "  return new ::grpc::ClientAsyncWriter< $Request$>("
+                   "std::unique_ptr< ::grpc::ClientAsyncWriter< $Request$>> "
+                   "$Service$::Stub::$Method$("
+                   "::grpc::ClientContext* context, $Response$* response, "
+                   "::grpc::CompletionQueue* cq, void* tag) {\n");
+    printer->Print(*vars,
+                   "  return std::unique_ptr< ::grpc::ClientAsyncWriter< "
+                   "$Request$>>(new ::grpc::ClientAsyncWriter< $Request$>("
                    "channel(), cq, "
                    "::grpc::RpcMethod($Service$_method_names[$Idx$], "
                    "::grpc::RpcMethod::RpcType::CLIENT_STREAMING), "
-                   "context, response, tag);\n"
+                   "context, response, tag));\n"
                    "}\n\n");
   } else if (ServerOnlyStreaming(method)) {
     printer->Print(
         *vars,
-        "::grpc::ClientReader< $Response$>* $Service$::Stub::$Method$("
+        "std::unique_ptr< ::grpc::ClientReader< $Response$>> "
+        "$Service$::Stub::$Method$("
         "::grpc::ClientContext* context, const $Request$& request) {\n");
     printer->Print(*vars,
-                   "  return new ::grpc::ClientReader< $Response$>("
+                   "  return std::unique_ptr< ::grpc::ClientReader< "
+                   "$Response$>>(new ::grpc::ClientReader< $Response$>("
                    "channel(),"
                    "::grpc::RpcMethod($Service$_method_names[$Idx$], "
                    "::grpc::RpcMethod::RpcType::SERVER_STREAMING), "
-                   "context, request);\n"
+                   "context, request));\n"
                    "}\n\n");
-    printer->Print(
-        *vars,
-        "::grpc::ClientAsyncReader< $Response$>* $Service$::Stub::$Method$("
-        "::grpc::ClientContext* context, const $Request$& request, "
-        "::grpc::CompletionQueue* cq, void* tag) {\n");
     printer->Print(*vars,
-                   "  return new ::grpc::ClientAsyncReader< $Response$>("
+                   "std::unique_ptr< ::grpc::ClientAsyncReader< $Response$>> "
+                   "$Service$::Stub::$Method$("
+                   "::grpc::ClientContext* context, const $Request$& request, "
+                   "::grpc::CompletionQueue* cq, void* tag) {\n");
+    printer->Print(*vars,
+                   "  return std::unique_ptr< ::grpc::ClientAsyncReader< "
+                   "$Response$>>(new ::grpc::ClientAsyncReader< $Response$>("
                    "channel(), cq, "
                    "::grpc::RpcMethod($Service$_method_names[$Idx$], "
                    "::grpc::RpcMethod::RpcType::SERVER_STREAMING), "
-                   "context, request, tag);\n"
+                   "context, request, tag));\n"
                    "}\n\n");
   } else if (BidiStreaming(method)) {
     printer->Print(
         *vars,
-        "::grpc::ClientReaderWriter< $Request$, $Response$>* "
+        "std::unique_ptr< ::grpc::ClientReaderWriter< $Request$, $Response$>> "
         "$Service$::Stub::$Method$(::grpc::ClientContext* context) {\n");
-    printer->Print(
-        *vars,
-        "  return new ::grpc::ClientReaderWriter< $Request$, $Response$>("
-        "channel(),"
-        "::grpc::RpcMethod($Service$_method_names[$Idx$], "
-        "::grpc::RpcMethod::RpcType::BIDI_STREAMING), "
-        "context);\n"
-        "}\n\n");
-    printer->Print(
-        *vars,
-        "::grpc::ClientAsyncReaderWriter< $Request$, $Response$>* "
-        "$Service$::Stub::$Method$(::grpc::ClientContext* context, "
-        "::grpc::CompletionQueue* cq, void* tag) {\n");
-    printer->Print(
-        *vars,
-        "  return new ::grpc::ClientAsyncReaderWriter< $Request$, $Response$>("
-        "channel(), cq, "
-        "::grpc::RpcMethod($Service$_method_names[$Idx$], "
-        "::grpc::RpcMethod::RpcType::BIDI_STREAMING), "
-        "context, tag);\n"
-        "}\n\n");
+    printer->Print(*vars,
+                   "  return std::unique_ptr< ::grpc::ClientReaderWriter< "
+                   "$Request$, $Response$>>(new ::grpc::ClientReaderWriter< "
+                   "$Request$, $Response$>("
+                   "channel(),"
+                   "::grpc::RpcMethod($Service$_method_names[$Idx$], "
+                   "::grpc::RpcMethod::RpcType::BIDI_STREAMING), "
+                   "context));\n"
+                   "}\n\n");
+    printer->Print(*vars,
+                   "std::unique_ptr< ::grpc::ClientAsyncReaderWriter< "
+                   "$Request$, $Response$>> "
+                   "$Service$::Stub::$Method$(::grpc::ClientContext* context, "
+                   "::grpc::CompletionQueue* cq, void* tag) {\n");
+    printer->Print(*vars,
+                   "  return std::unique_ptr< ::grpc::ClientAsyncReaderWriter< "
+                   "$Request$, $Response$>>(new "
+                   "::grpc::ClientAsyncReaderWriter< $Request$, $Response$>("
+                   "channel(), cq, "
+                   "::grpc::RpcMethod($Service$_method_names[$Idx$], "
+                   "::grpc::RpcMethod::RpcType::BIDI_STREAMING), "
+                   "context, tag));\n"
+                   "}\n\n");
   }
 }
 
@@ -587,9 +604,9 @@ void PrintSourceService(google::protobuf::io::Printer *printer,
 
   printer->Print(
       *vars,
-      "$Service$::Stub* $Service$::NewStub("
+      "std::unique_ptr< $Service$::Stub> $Service$::NewStub("
       "const std::shared_ptr< ::grpc::ChannelInterface>& channel) {\n"
-      "  $Service$::Stub* stub = new $Service$::Stub();\n"
+      "  std::unique_ptr< $Service$::Stub> stub(new $Service$::Stub());\n"
       "  stub->set_channel(channel);\n"
       "  return stub;\n"
       "};\n\n");
diff --git a/src/core/httpcli/httpcli.c b/src/core/httpcli/httpcli.c
index d372e694e9..d2cf09a8df 100644
--- a/src/core/httpcli/httpcli.c
+++ b/src/core/httpcli/httpcli.c
@@ -216,6 +216,7 @@ static void on_resolved(void *arg, grpc_resolved_addresses *addresses) {
   gpr_log(GPR_DEBUG, "%s", __FUNCTION__);
   if (!addresses) {
     finish(req, 0);
+    return;
   }
   req->addresses = addresses;
   req->next_address = 0;
diff --git a/src/core/json/json.c b/src/core/json/json.c
index df7108a94d..96e11eebb1 100644
--- a/src/core/json/json.c
+++ b/src/core/json/json.c
@@ -38,8 +38,8 @@
 #include "src/core/json/json.h"
 
 grpc_json *grpc_json_create(grpc_json_type type) {
-  grpc_json *json = gpr_malloc(sizeof(grpc_json));
-  memset(json, 0, sizeof(grpc_json));
+  grpc_json *json = gpr_malloc(sizeof(*json));
+  memset(json, 0, sizeof(*json));
   json->type = type;
 
   return json;
diff --git a/src/core/json/json_reader.c b/src/core/json/json_reader.c
index 774faa5f23..5ea4e9569c 100644
--- a/src/core/json/json_reader.c
+++ b/src/core/json/json_reader.c
@@ -93,7 +93,7 @@ static void json_reader_set_null(grpc_json_reader* reader) {
 /* Call this function to initialize the reader structure. */
 void grpc_json_reader_init(grpc_json_reader* reader,
                            grpc_json_reader_vtable* vtable, void* userdata) {
-  memset(reader, 0, sizeof(grpc_json_reader));
+  memset(reader, 0, sizeof(*reader));
   reader->vtable = vtable;
   reader->userdata = userdata;
   json_reader_string_clear(reader);
diff --git a/src/core/json/json_writer.c b/src/core/json/json_writer.c
index 4c0bf30780..a40bf1733e 100644
--- a/src/core/json/json_writer.c
+++ b/src/core/json/json_writer.c
@@ -51,7 +51,7 @@ static void json_writer_output_string_with_len(grpc_json_writer* writer, const c
 
 void grpc_json_writer_init(grpc_json_writer* writer, int indent,
                            grpc_json_writer_vtable* vtable, void* userdata) {
-  memset(writer, 0, sizeof(grpc_json_writer));
+  memset(writer, 0, sizeof(*writer));
   writer->container_empty = 1;
   writer->indent = indent;
   writer->vtable = vtable;
@@ -77,7 +77,7 @@ static void json_writer_output_indent(
 
   while (spaces >= (sizeof(spacesstr) - 1)) {
     json_writer_output_string_with_len(writer, spacesstr,
-                                            sizeof(spacesstr) - 1);
+                                       sizeof(spacesstr) - 1);
     spaces -= (sizeof(spacesstr) - 1);
   }
 
@@ -117,10 +117,10 @@ static void json_writer_escape_string(grpc_json_writer* writer,
     gpr_uint8 c = (gpr_uint8)*string++;
     if (c == 0) {
       break;
-    } else if ((c >= 32) && (c <= 127)) {
+    } else if ((c >= 32) && (c <= 126)) {
       if ((c == '\\') || (c == '"')) json_writer_output_char(writer, '\\');
       json_writer_output_char(writer, c);
-    } else if (c < 32) {
+    } else if ((c < 32) || (c == 127)) {
       switch (c) {
         case '\b':
           json_writer_output_string_with_len(writer, "\\b", 2);
@@ -161,6 +161,7 @@ static void json_writer_escape_string(grpc_json_writer* writer,
       for (i = 0; i < extra; i++) {
         utf32 <<= 6;
         c = *string++;
+        /* Breaks out and bail on any invalid UTF-8 sequence, including \0. */
         if ((c & 0xc0) != 0x80) {
           valid = 0;
           break;
diff --git a/src/core/security/auth.c b/src/core/security/auth.c
index 92878e3b7e..9b67d59cb8 100644
--- a/src/core/security/auth.c
+++ b/src/core/security/auth.c
@@ -234,6 +234,9 @@ static void destroy_call_elem(grpc_call_element *elem) {
   if (calld->host != NULL) {
     grpc_mdstr_unref(calld->host);
   }
+  if (calld->method != NULL) {
+    grpc_mdstr_unref(calld->method);
+  }
 }
 
 /* Constructor for channel_data */
@@ -276,6 +279,9 @@ static void destroy_channel_elem(grpc_channel_element *elem) {
   if (channeld->error_msg_key != NULL) {
     grpc_mdstr_unref(channeld->error_msg_key);
   }
+  if (channeld->path_string != NULL) {
+    grpc_mdstr_unref(channeld->path_string);
+  }
 }
 
 const grpc_channel_filter grpc_client_auth_filter = {
diff --git a/src/core/security/credentials.c b/src/core/security/credentials.c
index 42d1a900fc..7e72b238c8 100644
--- a/src/core/security/credentials.c
+++ b/src/core/security/credentials.c
@@ -1076,7 +1076,3 @@ grpc_credentials *grpc_iam_credentials_create(const char *token,
       c->md_ctx, GRPC_IAM_AUTHORITY_SELECTOR_METADATA_KEY, authority_selector);
   return &c->base;
 }
-
-/* -- Default credentials TODO(jboeuf). -- */
-
-grpc_credentials *grpc_default_credentials_create(void) { return NULL; }
diff --git a/src/core/security/credentials.h b/src/core/security/credentials.h
index 7b8929492b..0a0074c1d5 100644
--- a/src/core/security/credentials.h
+++ b/src/core/security/credentials.h
@@ -60,8 +60,15 @@ typedef enum {
   "x-goog-iam-authorization-token"
 #define GRPC_IAM_AUTHORITY_SELECTOR_METADATA_KEY "x-goog-iam-authority-selector"
 
+#define GRPC_GOOGLE_CLOUD_SDK_CONFIG_DIRECTORY "gcloud"
+#define GRPC_GOOGLE_WELL_KNOWN_CREDENTIALS_FILE \
+  "application_default_credentials.json"
+
 /* --- grpc_credentials. --- */
 
+/* It is the caller's responsibility to gpr_free the result if not NULL. */
+char *grpc_get_well_known_google_credentials_file_path(void);
+
 typedef void (*grpc_credentials_metadata_cb)(void *user_data,
                                              grpc_mdelem **md_elems,
                                              size_t num_md,
diff --git a/src/core/security/credentials_posix.c b/src/core/security/credentials_posix.c
new file mode 100644
index 0000000000..79622cb024
--- /dev/null
+++ b/src/core/security/credentials_posix.c
@@ -0,0 +1,60 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <grpc/support/port_platform.h>
+
+#ifdef GPR_POSIX_FILE
+
+#include "src/core/security/credentials.h"
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+
+#include "src/core/support/env.h"
+#include "src/core/support/string.h"
+
+char *grpc_get_well_known_google_credentials_file_path(void) {
+  char *result = NULL;
+  char *home = gpr_getenv("HOME");
+  if (home == NULL) {
+    gpr_log(GPR_ERROR, "Could not get HOME environment variable.");
+    return NULL;
+  }
+  gpr_asprintf(&result, "%s/.config/%s/%s", home,
+               GRPC_GOOGLE_CLOUD_SDK_CONFIG_DIRECTORY,
+               GRPC_GOOGLE_WELL_KNOWN_CREDENTIALS_FILE);
+  gpr_free(home);
+  return result;
+}
+
+#endif /* GPR_POSIX_FILE */
diff --git a/src/core/security/credentials_win32.c b/src/core/security/credentials_win32.c
new file mode 100644
index 0000000000..ddb310468b
--- /dev/null
+++ b/src/core/security/credentials_win32.c
@@ -0,0 +1,60 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <grpc/support/port_platform.h>
+
+#ifdef GPR_WIN32
+
+#include "src/core/security/credentials.h"
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+
+#include "src/core/support/env.h"
+#include "src/core/support/string.h"
+
+char *grpc_get_well_known_google_credentials_file_path(void) {
+  char *result = NULL;
+  char *appdata_path = gpr_getenv("APPDATA");
+  if (appdata_path == NULL) {
+    gpr_log(GPR_ERROR, "Could not get APPDATA environment variable.");
+    return NULL;
+  }
+  gpr_asprintf(&result, "%s/%s/%s", appdata_path,
+               GRPC_GOOGLE_CLOUD_SDK_CONFIG_DIRECTORY,
+               GRPC_GOOGLE_WELL_KNOWN_CREDENTIALS_FILE);
+  gpr_free(appdata_path);
+  return result;
+}
+
+#endif /* GPR_WIN32 */
diff --git a/src/core/security/google_default_credentials.c b/src/core/security/google_default_credentials.c
new file mode 100644
index 0000000000..dc0e453b87
--- /dev/null
+++ b/src/core/security/google_default_credentials.c
@@ -0,0 +1,185 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "src/core/security/credentials.h"
+
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/sync.h>
+
+#include "src/core/httpcli/httpcli.h"
+#include "src/core/support/env.h"
+#include "src/core/support/file.h"
+
+/* -- Constants. -- */
+
+#define GRPC_COMPUTE_ENGINE_DETECTION_HOST "metadata.google.internal"
+#define GRPC_GOOGLE_CREDENTIALS_ENV_VAR "GOOGLE_APPLICATION_CREDENTIALS"
+
+/* -- Default credentials. -- */
+
+static grpc_credentials *default_credentials = NULL;
+static int compute_engine_detection_done = 0;
+static gpr_mu g_mu;
+static gpr_once g_once = GPR_ONCE_INIT;
+
+static void init_default_credentials(void) {
+  gpr_mu_init(&g_mu);
+}
+
+typedef struct {
+  gpr_cv cv;
+  gpr_mu mu;
+  int is_done;
+  int success;
+} compute_engine_detector;
+
+static void on_compute_engine_detection_http_response(
+    void *user_data, const grpc_httpcli_response *response) {
+  compute_engine_detector *detector = (compute_engine_detector *)user_data;
+  if (response != NULL && response->status == 200 && response->hdr_count > 0) {
+    /* Internet providers can return a generic response to all requests, so
+       it is necessary to check that metadata header is present also. */
+    size_t i;
+    for (i = 0; i < response->hdr_count; i++) {
+      grpc_httpcli_header *header = &response->hdrs[i];
+      if (!strcmp(header->key, "Metadata-Flavor") &&
+          !strcmp(header->value, "Google")) {
+        detector->success = 1;
+        break;
+      }
+    }
+  }
+  gpr_mu_lock(&detector->mu);
+  detector->is_done = 1;
+  gpr_mu_unlock(&detector->mu);
+  gpr_cv_signal(&detector->cv);
+}
+
+static int is_stack_running_on_compute_engine(void) {
+  compute_engine_detector detector;
+  grpc_httpcli_request request;
+
+  /* The http call is local. If it takes more than one sec, it is for sure not
+     on compute engine. */
+  gpr_timespec max_detection_delay = {1, 0};
+
+  gpr_mu_init(&detector.mu);
+  gpr_cv_init(&detector.cv);
+  detector.is_done = 0;
+  detector.success = 0;
+
+  memset(&request, 0, sizeof(grpc_httpcli_request));
+  request.host = GRPC_COMPUTE_ENGINE_DETECTION_HOST;
+  request.path = "/";
+
+  grpc_httpcli_get(&request, gpr_time_add(gpr_now(), max_detection_delay),
+                   on_compute_engine_detection_http_response, &detector);
+
+  /* Block until we get the response. This is not ideal but this should only be
+     called once for the lifetime of the process by the default credentials. */
+  gpr_mu_lock(&detector.mu);
+  while (!detector.is_done) {
+    gpr_cv_wait(&detector.cv, &detector.mu, gpr_inf_future);
+  }
+  gpr_mu_unlock(&detector.mu);
+
+  gpr_mu_destroy(&detector.mu);
+  gpr_cv_destroy(&detector.cv);
+  return detector.success;
+}
+
+/* Takes ownership of creds_path if not NULL. */
+static grpc_credentials *create_jwt_creds_from_path(char *creds_path) {
+  grpc_credentials *result = NULL;
+  gpr_slice creds_data;
+  int file_ok = 0;
+  if (creds_path == NULL) return NULL;
+  creds_data = gpr_load_file(creds_path, &file_ok);
+  gpr_free(creds_path);
+  if (file_ok) {
+    result = grpc_jwt_credentials_create(
+        (const char *)GPR_SLICE_START_PTR(creds_data),
+        grpc_max_auth_token_lifetime);
+    gpr_slice_unref(creds_data);
+  }
+  return result;
+}
+
+grpc_credentials *grpc_google_default_credentials_create(void) {
+  grpc_credentials *result = NULL;
+  int serving_cached_credentials = 0;
+  gpr_once_init(&g_once, init_default_credentials);
+
+  gpr_mu_lock(&g_mu);
+
+  if (default_credentials != NULL) {
+    result = default_credentials;
+    serving_cached_credentials = 1;
+    goto end;
+  }
+
+  /* First, try the environment variable. */
+  result =
+      create_jwt_creds_from_path(gpr_getenv(GRPC_GOOGLE_CREDENTIALS_ENV_VAR));
+  if (result != NULL) goto end;
+
+  /* Then the well-known file. */
+  result = create_jwt_creds_from_path(
+      grpc_get_well_known_google_credentials_file_path());
+  if (result != NULL) goto end;
+
+  /* At last try to see if we're on compute engine (do the detection only once
+     since it requires a network test). */
+  if (!compute_engine_detection_done) {
+    int need_compute_engine_creds = is_stack_running_on_compute_engine();
+    compute_engine_detection_done = 1;
+    if (need_compute_engine_creds) {
+      result = grpc_compute_engine_credentials_create();
+    }
+  }
+
+end:
+  if (!serving_cached_credentials && result != NULL) {
+    /* Blend with default ssl credentials and add a global reference so that it
+       can be cached and re-served. */
+    result = grpc_composite_credentials_create(
+        grpc_ssl_credentials_create(NULL, NULL), result);
+    GPR_ASSERT(result != NULL);
+    default_credentials = grpc_credentials_ref(result);
+  }
+  gpr_mu_unlock(&g_mu);
+  return result;
+}
diff --git a/src/core/security/security_context.c b/src/core/security/security_context.c
index fd8baff539..9dce5af740 100644
--- a/src/core/security/security_context.c
+++ b/src/core/security/security_context.c
@@ -641,9 +641,3 @@ grpc_channel *grpc_secure_channel_create_with_factories(
           creds->type);
   return grpc_lame_client_channel_create();
 }
-
-grpc_channel *grpc_default_secure_channel_create(
-    const char *target, const grpc_channel_args *args) {
-  return grpc_secure_channel_create(grpc_default_credentials_create(), target,
-                                    args);
-}
diff --git a/src/core/support/log_win32.c b/src/core/support/log_win32.c
index cff130ae18..720dc141f5 100644
--- a/src/core/support/log_win32.c
+++ b/src/core/support/log_win32.c
@@ -90,7 +90,7 @@ void gpr_default_log(gpr_log_func_args *args) {
     strcpy(time_buffer, "error:strftime");
   }
 
-  fprintf(stderr, "%s%s.%09u %5u %s:%d: %s\n",
+  fprintf(stderr, "%s%s.%09u %5u %s:%d] %s\n",
           gpr_log_severity_string(args->severity), time_buffer,
           (int)(now.tv_nsec), GetCurrentThreadId(),
           args->file, args->line, args->message);
diff --git a/src/core/support/string_posix.c b/src/core/support/string_posix.c
index 8a678b3103..25c333db4e 100644
--- a/src/core/support/string_posix.c
+++ b/src/core/support/string_posix.c
@@ -51,7 +51,7 @@ int gpr_asprintf(char **strp, const char *format, ...) {
   va_start(args, format);
   ret = vsnprintf(buf, sizeof(buf), format, args);
   va_end(args);
-  if (!(0 <= ret)) {
+  if (ret < 0) {
     *strp = NULL;
     return -1;
   }
diff --git a/src/core/support/sync.c b/src/core/support/sync.c
index 1a5cf57c4f..ccfe1e25f4 100644
--- a/src/core/support/sync.c
+++ b/src/core/support/sync.c
@@ -41,7 +41,7 @@
    Should be a prime. */
 enum { event_sync_partitions = 31 };
 
-/* Event are partitioned by address to avoid lock contention. */
+/* Events are partitioned by address to avoid lock contention. */
 static struct sync_array_s {
   gpr_mu mu;
   gpr_cv cv;
@@ -71,10 +71,10 @@ void gpr_event_set(gpr_event *ev, void *value) {
   struct sync_array_s *s = hash(ev);
   gpr_mu_lock(&s->mu);
   GPR_ASSERT(gpr_atm_acq_load(&ev->state) == 0);
-  GPR_ASSERT(value != NULL);
   gpr_atm_rel_store(&ev->state, (gpr_atm)value);
   gpr_cv_broadcast(&s->cv);
   gpr_mu_unlock(&s->mu);
+  GPR_ASSERT(value != NULL);
 }
 
 void *gpr_event_get(gpr_event *ev) {
diff --git a/src/core/support/time.c b/src/core/support/time.c
index 67f7665650..7dbf95059f 100644
--- a/src/core/support/time.c
+++ b/src/core/support/time.c
@@ -85,12 +85,12 @@ gpr_timespec gpr_time_from_nanos(long ns) {
   } else if (ns == LONG_MIN) {
     result = gpr_inf_past;
   } else if (ns >= 0) {
-    result.tv_sec = ns / 1000000000;
-    result.tv_nsec = ns - result.tv_sec * 1000000000;
+    result.tv_sec = ns / GPR_NS_PER_SEC;
+    result.tv_nsec = ns - result.tv_sec * GPR_NS_PER_SEC;
   } else {
     /* Calculation carefully formulated to avoid any possible under/overflow. */
-    result.tv_sec = (-(999999999 - (ns + 1000000000)) / 1000000000) - 1;
-    result.tv_nsec = ns - result.tv_sec * 1000000000;
+    result.tv_sec = (-(999999999 - (ns + GPR_NS_PER_SEC)) / GPR_NS_PER_SEC) - 1;
+    result.tv_nsec = ns - result.tv_sec * GPR_NS_PER_SEC;
   }
   return result;
 }
@@ -172,8 +172,8 @@ gpr_timespec gpr_time_add(gpr_timespec a, gpr_timespec b) {
   gpr_timespec sum;
   int inc = 0;
   sum.tv_nsec = a.tv_nsec + b.tv_nsec;
-  if (sum.tv_nsec >= 1000000000) {
-    sum.tv_nsec -= 1000000000;
+  if (sum.tv_nsec >= GPR_NS_PER_SEC) {
+    sum.tv_nsec -= GPR_NS_PER_SEC;
     inc++;
   }
   if (a.tv_sec == TYPE_MAX(time_t) || a.tv_sec == TYPE_MIN(time_t)) {
@@ -200,7 +200,7 @@ gpr_timespec gpr_time_sub(gpr_timespec a, gpr_timespec b) {
   int dec = 0;
   diff.tv_nsec = a.tv_nsec - b.tv_nsec;
   if (diff.tv_nsec < 0) {
-    diff.tv_nsec += 1000000000;
+    diff.tv_nsec += GPR_NS_PER_SEC;
     dec++;
   }
   if (a.tv_sec == TYPE_MAX(time_t) || a.tv_sec == TYPE_MIN(time_t)) {
diff --git a/src/cpp/client/credentials.cc b/src/cpp/client/credentials.cc
index 66571cad73..a140f551e0 100644
--- a/src/cpp/client/credentials.cc
+++ b/src/cpp/client/credentials.cc
@@ -45,8 +45,8 @@ Credentials::Credentials(grpc_credentials *c_creds) : creds_(c_creds) {}
 Credentials::~Credentials() { grpc_credentials_release(creds_); }
 grpc_credentials *Credentials::GetRawCreds() { return creds_; }
 
-std::unique_ptr<Credentials> CredentialsFactory::DefaultCredentials() {
-  grpc_credentials *c_creds = grpc_default_credentials_create();
+std::unique_ptr<Credentials> CredentialsFactory::GoogleDefaultCredentials() {
+  grpc_credentials *c_creds = grpc_google_default_credentials_create();
   std::unique_ptr<Credentials> cpp_creds(new Credentials(c_creds));
   return cpp_creds;
 }
@@ -86,6 +86,18 @@ std::unique_ptr<Credentials> CredentialsFactory::ServiceAccountCredentials(
   return cpp_creds;
 }
 
+// Builds JWT credentials.
+std::unique_ptr<Credentials> CredentialsFactory::JWTCredentials(
+    const grpc::string &json_key, std::chrono::seconds token_lifetime) {
+  gpr_timespec lifetime = gpr_time_from_seconds(
+      token_lifetime.count() > 0 ? token_lifetime.count() : 0);
+  grpc_credentials *c_creds =
+      grpc_jwt_credentials_create(json_key.c_str(), lifetime);
+  std::unique_ptr<Credentials> cpp_creds(
+      c_creds == nullptr ? nullptr : new Credentials(c_creds));
+  return cpp_creds;
+}
+
 // Builds IAM credentials.
 std::unique_ptr<Credentials> CredentialsFactory::IAMCredentials(
     const grpc::string &authorization_token,
@@ -98,7 +110,7 @@ std::unique_ptr<Credentials> CredentialsFactory::IAMCredentials(
 }
 
 // Combines two credentials objects into a composite credentials.
-std::unique_ptr<Credentials> CredentialsFactory::ComposeCredentials(
+std::unique_ptr<Credentials> CredentialsFactory::CompositeCredentials(
     const std::unique_ptr<Credentials> &creds1,
     const std::unique_ptr<Credentials> &creds2) {
   // Note that we are not saving unique_ptrs to the two credentials
diff --git a/src/cpp/server/thread_pool.cc b/src/cpp/server/thread_pool.cc
index 1ca98129d3..fa11ddd04c 100644
--- a/src/cpp/server/thread_pool.cc
+++ b/src/cpp/server/thread_pool.cc
@@ -37,11 +37,11 @@ namespace grpc {
 
 ThreadPool::ThreadPool(int num_threads) {
   for (int i = 0; i < num_threads; i++) {
-    threads_.push_back(std::thread([=]() {
+    threads_.push_back(std::thread([this]() {
       for (;;) {
-        std::unique_lock<std::mutex> lock(mu_);
         // Wait until work is available or we are shutting down.
-        auto have_work = [=]() { return shutdown_ || !callbacks_.empty(); };
+        auto have_work = [this]() { return shutdown_ || !callbacks_.empty(); };
+        std::unique_lock<std::mutex> lock(mu_);
         if (!have_work()) {
           cv_.wait(lock, have_work);
         }
diff --git a/src/node/examples/pubsub/empty.proto b/src/node/examples/pubsub/empty.proto
new file mode 100644
index 0000000000..5d6eb10841
--- /dev/null
+++ b/src/node/examples/pubsub/empty.proto
@@ -0,0 +1,44 @@
+// This file will be moved to a new location.
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto2";
+
+package proto2;
+
+// An empty message that you can re-use to avoid defining duplicated empty
+// messages in your project. A typical example is to use it as argument or the
+// return value of a service API. For instance:
+//
+//   service Foo {
+//     rpc Bar (proto2.Empty) returns (proto2.Empty) { };
+//   };
+//
+message Empty {}
diff --git a/src/node/examples/pubsub/label.proto b/src/node/examples/pubsub/label.proto
new file mode 100644
index 0000000000..0af15a25a6
--- /dev/null
+++ b/src/node/examples/pubsub/label.proto
@@ -0,0 +1,79 @@
+// This file will be moved to a new location.
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Labels provide a way to associate user-defined metadata with various
+// objects.  Labels may be used to organize objects into non-hierarchical
+// groups; think metadata tags attached to mp3s.
+
+syntax = "proto2";
+
+package tech.label;
+
+// A key-value pair applied to a given object.
+message Label {
+  // The key of a label is a syntactically valid URL (as per RFC 1738) with
+  // the "scheme" and initial slashes omitted and with the additional
+  // restrictions noted below.  Each key should be globally unique.  The
+  // "host" portion is called the "namespace" and is not necessarily
+  // resolvable to a network endpoint.  Instead, the namespace indicates what
+  // system or entity defines the semantics of the label.  Namespaces do not
+  // restrict the set of objects to which a label may be associated.
+  //
+  // Keys are defined by the following grammar:
+  //
+  //   key          = hostname "/" kpath
+  //   kpath        = ksegment *[ "/" ksegment ]
+  //   ksegment     = alphadigit | *[ alphadigit | "-" | "_" | "." ]
+  //
+  // where "hostname" and "alphadigit" are defined as in RFC 1738.
+  //
+  // Example key:
+  //   spanner.google.com/universe
+  required string key = 1;
+
+  // The value of the label.
+  oneof value {
+    // A string value.
+    string str_value = 2;
+    // An integer value.
+    int64 num_value = 3;
+  }
+}
+
+// A collection of labels, such as the set of all labels attached to an
+// object.  Each label in the set must have a different key.
+//
+// Users should prefer to embed "repeated Label" directly when possible.
+// This message should only be used in cases where that isn't possible (e.g.
+// with oneof).
+message Labels {
+  repeated Label label = 1;
+}
diff --git a/src/node/examples/pubsub/pubsub.proto b/src/node/examples/pubsub/pubsub.proto
new file mode 100644
index 0000000000..41a354773f
--- /dev/null
+++ b/src/node/examples/pubsub/pubsub.proto
@@ -0,0 +1,734 @@
+// This file will be moved to a new location.
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// Specification of the Pubsub API.
+
+syntax = "proto2";
+
+import "empty.proto";
+import "label.proto";
+
+package tech.pubsub;
+
+// -----------------------------------------------------------------------------
+// Overview of the Pubsub API
+// -----------------------------------------------------------------------------
+
+// This file describes an API for a Pubsub system.  This system provides a
+// reliable many-to-many communication mechanism between independently written
+// publishers and subscribers where the publisher publishes messages to "topics"
+// and each subscriber creates a "subscription" and consumes messages from it.
+//
+// (a) The pubsub system maintains bindings between topics and subscriptions.
+// (b) A publisher publishes messages into a topic.
+// (c) The pubsub system delivers messages from topics into relevant
+//     subscriptions.
+// (d) A subscriber receives pending messages from its subscription and
+//     acknowledges or nacks each one to the pubsub system.
+// (e) The pubsub system removes acknowledged messages from that subscription.
+
+// -----------------------------------------------------------------------------
+// Data Model
+// -----------------------------------------------------------------------------
+
+// The data model consists of the following:
+//
+// * Topic: A topic is a resource to which messages are published by publishers.
+//     Topics are named, and the name of the topic is unique within the pubsub
+//     system.
+//
+// * Subscription: A subscription records the subscriber's interest in a topic.
+//     It can optionally include a query to select a subset of interesting
+//     messages.  The pubsub system maintains a logical cursor tracking the
+//     matching messages which still need to be delivered and acked so that
+//     they can retried as needed.  The set of messages that have not been
+//     acknowledged is called the subscription backlog.
+//
+// * Message: A message is a unit of data that flows in the system.  It contains
+//     opaque data from the publisher along with its labels.
+//
+// * Message Labels (optional): A set of opaque key, value pairs assigned
+//     by the publisher which the subscriber can use for filtering out messages
+//     in the topic.  For example, a label with key "foo.com/device_type" and
+//     value "mobile" may be added for messages that are only relevant for a
+//     mobile subscriber; a subscriber on a phone may decide to create a
+//     subscription only for messages that have this label.
+
+// -----------------------------------------------------------------------------
+// Publisher Flow
+// -----------------------------------------------------------------------------
+
+// A publisher publishes messages to the topic using the Publish request:
+//
+//   PubsubMessage message;
+//   message.set_data("....");
+//   Label label;
+//   label.set_key("foo.com/key1");
+//   label.set_str_value("value1");
+//   message.add_label(label);
+//   PublishRequest request;
+//   request.set_topic("topicName");
+//   request.set_message(message);
+//   PublisherService.Publish(request);
+
+// -----------------------------------------------------------------------------
+// Subscriber Flow
+// -----------------------------------------------------------------------------
+
+// The subscriber part of the API is richer than the publisher part and has a
+// number of concepts w.r.t. subscription creation and monitoring:
+//
+// (1) A subscriber creates a subscription using the CreateSubscription call.
+//     It may specify an optional "query" to indicate that it wants to receive
+//     only messages with a certain set of labels using the label query syntax.
+//     It may also specify an optional truncation policy to indicate when old
+//     messages from the subcription can be removed.
+//
+// (2) A subscriber receives messages in one of two ways: via push or pull.
+//
+// (a) To receive messages via push, the PushConfig field must be specified in
+//     the Subscription parameter when creating a subscription.  The PushConfig
+//     specifies an endpoint at which the subscriber must expose the
+//     PushEndpointService.  Messages are received via the HandlePubsubEvent
+//     method.  The push subscriber responds to the HandlePubsubEvent method
+//     with a result code that indicates one of three things: Ack (the message
+//     has been successfully processed and the Pubsub system may delete it),
+//     Nack (the message has been rejected, the Pubsub system should resend it
+//     at a later time), or Push-Back (this is a Nack with the additional
+//     semantics that the subscriber is overloaded and the pubsub system should
+//     back off on the rate at which it is invoking HandlePubsubEvent).  The
+//     endpoint may be a load balancer for better scalability.
+//
+// (b) To receive messages via pull a subscriber calls the Pull method on the
+//     SubscriberService to get messages from the subscription.  For each
+//     individual message, the subscriber may use the ack_id received in the
+//     PullResponse to Ack the message, Nack the message, or modify the ack
+//     deadline with ModifyAckDeadline.  See the
+//     Subscription.ack_deadline_seconds field documentation for details on the
+//     ack deadline behavior.
+//
+//     Note: Messages may be consumed in parallel by multiple subscribers making
+//       Pull calls to the same subscription; this will result in the set of
+//       messages from the subscription being shared and each subscriber
+//       receiving a subset of the messages.
+//
+// (4) The subscriber can explicitly truncate the current subscription.
+//
+// (5) "Truncated" events are delivered when a subscription is
+//     truncated, whether due to the subscription's truncation policy
+//     or an explicit request from the subscriber.
+//
+// Subscription creation:
+//
+//   Subscription subscription;
+//   subscription.set_topic("topicName");
+//   subscription.set_name("subscriptionName");
+//   subscription.push_config().set_push_endpoint("machinename:8888");
+//   SubscriberService.CreateSubscription(subscription);
+//
+// Consuming messages via push:
+//
+//  TODO(eschapira): Add HTTP push example.
+//
+//  The port 'machinename:8888' must be bound to a stubby server that implements
+//  the PushEndpointService with the following method:
+//
+//   int HandlePubsubEvent(PubsubEvent event) {
+//     if (event.subscription().equals("subscriptionName")) {
+//       if (event.has_message()) {
+//         Process(event.message().data());
+//       } else if (event.truncated()) {
+//         ProcessTruncatedEvent();
+//       }
+//     }
+//     return OK;  // This return code implies an acknowledgment
+//   }
+//
+// Consuming messages via pull:
+//
+//  The subscription must be created without setting the push_config field.
+//
+//   PullRequest pull_request;
+//   pull_request.set_subscription("subscriptionName");
+//   pull_request.set_return_immediately(false);
+//   while (true) {
+//     PullResponse pull_response;
+//     if (SubscriberService.Pull(pull_request, pull_response) == OK) {
+//       PubsubEvent event = pull_response.pubsub_event();
+//       if (event.has_message()) {
+//         Process(event.message().data());
+//       } else if (event.truncated()) {
+//         ProcessTruncatedEvent();
+//       }
+//       AcknowledgeRequest ack_request;
+//       ackRequest.set_subscription("subscriptionName");
+//       ackRequest.set_ack_id(pull_response.ack_id());
+//       SubscriberService.Acknowledge(ack_request);
+//     }
+//   }
+
+// -----------------------------------------------------------------------------
+// Reliability Semantics
+// -----------------------------------------------------------------------------
+
+// When a subscriber successfully creates a subscription using
+// Subscriber.CreateSubscription, it establishes a "subscription point" with
+// respect to that subscription - the subscriber is guaranteed to receive any
+// message published after this subscription point that matches the
+// subscription's query.  Note that messages published before the Subscription
+// point may or may not be delivered.
+//
+// If the system truncates the subscription according to the specified
+// truncation policy, the system delivers a subscription status event with the
+// "truncated" field set to true.  We refer to such events as "truncation
+// events".  A truncation event:
+//
+// * Informs the subscriber that part of the subscription messages have been
+//   discarded.  The subscriber may want to recover from the message loss, e.g.,
+//   by resyncing its state with its backend.
+// * Establishes a new subscription point, i.e., the subscriber is guaranteed to
+//   receive all changes published after the trunction event is received (or
+//   until another truncation event is received).
+//
+// Note that messages are not delivered in any particular order by the pubsub
+// system.  Furthermore, the system guarantees at-least-once delivery
+// of each message or truncation events until acked.
+
+// -----------------------------------------------------------------------------
+// Deletion
+// -----------------------------------------------------------------------------
+
+// Both topics and subscriptions may be deleted.  Deletion of a topic implies
+// deletion of all attached subscriptions.
+//
+// When a subscription is deleted directly by calling DeleteSubscription, all
+// messages are immediately dropped.  If it is a pull subscriber, future pull
+// requests will return NOT_FOUND.
+//
+// When a topic is deleted all corresponding subscriptions are immediately
+// deleted, and subscribers experience the same behavior as directly deleting
+// the subscription.
+
+// -----------------------------------------------------------------------------
+// The Publisher service and its protos.
+// -----------------------------------------------------------------------------
+
+// The service that an application uses to manipulate topics, and to send
+// messages to a topic.
+service PublisherService {
+
+  // Creates the given topic with the given name.
+  rpc CreateTopic(Topic) returns (Topic) {
+  }
+
+  // Adds a message to the topic.  Returns NOT_FOUND if the topic does not
+  // exist.
+  // (-- For different error code values returned via Stubby, see
+  // util/task/codes.proto. --)
+  rpc Publish(PublishRequest) returns (proto2.Empty) {
+  }
+
+  // Adds one or more messages to the topic. Returns NOT_FOUND if the topic does
+  // not exist.
+  rpc PublishBatch(PublishBatchRequest) returns (PublishBatchResponse) {
+  }
+
+  // Gets the configuration of a topic. Since the topic only has the name
+  // attribute, this method is only useful to check the existence of a topic.
+  // If other attributes are added in the future, they will be returned here.
+  rpc GetTopic(GetTopicRequest) returns (Topic) {
+  }
+
+  // Lists matching topics.
+  rpc ListTopics(ListTopicsRequest) returns (ListTopicsResponse) {
+  }
+
+  // Deletes the topic with the given name.  All subscriptions to this topic
+  // are also deleted. Returns NOT_FOUND if the topic does not exist.
+  // After a topic is deleted, a new topic may be created with the same name.
+  rpc DeleteTopic(DeleteTopicRequest) returns (proto2.Empty)  {
+  }
+}
+
+// A topic resource.
+message Topic {
+  // Name of the topic.
+  optional string name = 1;
+}
+
+// A message data and its labels.
+message PubsubMessage {
+  // The message payload.
+  optional bytes data = 1;
+
+  // Optional list of labels for this message. Keys in this collection must
+  // be unique.
+  //(-- TODO(eschapira): Define how key namespace may be scoped to the topic.--)
+  repeated tech.label.Label label = 2;
+
+  // ID of this message assigned by the server at publication time. Guaranteed
+  // to be unique within the topic. This value may be read by a subscriber
+  // that receives a PubsubMessage via a Pull call or a push delivery. It must
+  // not be populated by a publisher in a Publish call.
+  optional string message_id = 3;
+}
+
+// Request for the GetTopic method.
+message GetTopicRequest {
+  // The name of the topic to get.
+  optional string topic = 1;
+}
+
+// Request for the Publish method.
+message PublishRequest {
+  // The message in the request will be published on this topic.
+  optional string topic = 1;
+
+  // The message to publish.
+  optional PubsubMessage message = 2;
+}
+
+// Request for the PublishBatch method.
+message PublishBatchRequest {
+  // The messages in the request will be published on this topic.
+  optional string topic = 1;
+
+  // The messages to publish.
+  repeated PubsubMessage messages = 2;
+}
+
+// Response for the PublishBatch method.
+message PublishBatchResponse {
+  // The server-assigned ID of each published message, in the same order as
+  // the messages in the request. IDs are guaranteed to be unique within
+  // the topic.
+  repeated string message_ids = 1;
+}
+
+// Request for the ListTopics method.
+message ListTopicsRequest {
+  // A valid label query expression.
+  //
+  optional string query = 1;
+
+  // Maximum number of topics to return.
+  // (-- If not specified or <= 0, the implementation will select a reasonable
+  // value. --)
+  optional int32 max_results = 2;
+
+  // The value obtained in the last <code>ListTopicsResponse</code>
+  // for continuation.
+  optional string page_token = 3;
+
+}
+
+// Response for the ListTopics method.
+message ListTopicsResponse {
+  // The resulting topics.
+  repeated Topic topic = 1;
+
+  // If not empty, indicates that there are more topics that match the request,
+  // and this value should be passed to the next <code>ListTopicsRequest</code>
+  // to continue.
+  optional string next_page_token = 2;
+}
+
+// Request for the Delete method.
+message DeleteTopicRequest {
+  // Name of the topic to delete.
+  optional string topic = 1;
+}
+
+// -----------------------------------------------------------------------------
+// The Subscriber service and its protos.
+// -----------------------------------------------------------------------------
+
+// The service that an application uses to manipulate subscriptions and to
+// consume messages from a subscription via the pull method.
+service SubscriberService {
+
+  // Creates a subscription on a given topic for a given subscriber.
+  // If the subscription already exists, returns ALREADY_EXISTS.
+  // If the corresponding topic doesn't exist, returns NOT_FOUND.
+  //
+  // If the name is not provided in the request, the server will assign a random
+  // name for this subscription on the same project as the topic.
+  rpc CreateSubscription(Subscription) returns (Subscription) {
+  }
+
+  // Gets the configuration details of a subscription.
+  rpc GetSubscription(GetSubscriptionRequest) returns (Subscription) {
+  }
+
+  // Lists matching subscriptions.
+  rpc ListSubscriptions(ListSubscriptionsRequest)
+      returns (ListSubscriptionsResponse) {
+  }
+
+  // Deletes an existing subscription. All pending messages in the subscription
+  // are immediately dropped. Calls to Pull after deletion will return
+  // NOT_FOUND.
+  rpc DeleteSubscription(DeleteSubscriptionRequest) returns (proto2.Empty) {
+  }
+
+  // Removes all the pending messages in the subscription and releases the
+  // storage associated with them. Results in a truncation event to be sent to
+  // the subscriber. Messages added after this call returns are stored in the
+  // subscription as before.
+  rpc TruncateSubscription(TruncateSubscriptionRequest) returns (proto2.Empty) {
+  }
+
+  //
+  // Push subscriber calls.
+  //
+
+  // Modifies the <code>PushConfig</code> for a specified subscription.
+  // This method can be used to suspend the flow of messages to an endpoint
+  // by clearing the <code>PushConfig</code> field in the request. Messages
+  // will be accumulated for delivery even if no push configuration is
+  // defined or while the configuration is modified.
+  rpc ModifyPushConfig(ModifyPushConfigRequest) returns (proto2.Empty) {
+  }
+
+  //
+  // Pull Subscriber calls
+  //
+
+  // Pulls a single message from the server.
+  // If return_immediately is true, and no messages are available in the
+  // subscription, this method returns FAILED_PRECONDITION. The system is free
+  // to return an UNAVAILABLE error if no messages are available in a
+  // reasonable amount of time (to reduce system load).
+  rpc Pull(PullRequest) returns (PullResponse) {
+  }
+
+  // Pulls messages from the server. Returns an empty list if there are no
+  // messages available in the backlog. The system is free to return UNAVAILABLE
+  // if there are too many pull requests outstanding for the given subscription.
+  rpc PullBatch(PullBatchRequest) returns (PullBatchResponse) {
+  }
+
+  // Modifies the Ack deadline for a message received from a pull request.
+  rpc ModifyAckDeadline(ModifyAckDeadlineRequest) returns (proto2.Empty) {
+  }
+
+  // Acknowledges a particular received message: the Pub/Sub system can remove
+  // the given message from the subscription. Acknowledging a message whose
+  // Ack deadline has expired may succeed, but the message could have been
+  // already redelivered. Acknowledging a message more than once will not
+  // result in an error. This is only used for messages received via pull.
+  rpc Acknowledge(AcknowledgeRequest) returns (proto2.Empty) {
+  }
+
+  // Refuses processing a particular received message. The system will
+  // redeliver this message to some consumer of the subscription at some
+  // future time. This is only used for messages received via pull.
+  rpc Nack(NackRequest) returns (proto2.Empty) {
+  }
+}
+
+// A subscription resource.
+message Subscription {
+  // Name of the subscription.
+  optional string name = 1;
+
+  // The name of the topic from which this subscription is receiving messages.
+  optional string topic = 2;
+
+  // If <code>query</code> is non-empty, only messages on the subscriber's
+  // topic whose labels match the query will be returned. Otherwise all
+  // messages on the topic will be returned.
+  //
+  optional string query = 3;
+
+  // The subscriber may specify requirements for truncating unacknowledged
+  // subscription entries. The system will honor the
+  // <code>CreateSubscription</code> request only if it can meet these
+  // requirements. If this field is not specified, messages are never truncated
+  // by the system.
+  optional TruncationPolicy truncation_policy = 4;
+
+  // Specifies which messages can be truncated by the system.
+  message TruncationPolicy {
+    oneof policy {
+      // If <code>max_bytes</code> is specified, the system is allowed to drop
+      // old messages to keep the combined size of stored messages under
+      // <code>max_bytes</code>. This is a hint; the system may keep more than
+      // this many bytes, but will make a best effort to keep the size from
+      // growing much beyond this parameter.
+      int64 max_bytes = 1;
+
+      // If <code>max_age_seconds</code> is specified, the system is allowed to
+      // drop messages that have been stored for at least this many seconds.
+      // This is a hint; the system may keep these messages, but will make a
+      // best effort to remove them when their maximum age is reached.
+      int64 max_age_seconds = 2;
+    }
+  }
+
+  // If push delivery is used with this subscription, this field is
+  // used to configure it.
+  optional PushConfig push_config = 5;
+
+  // For either push or pull delivery, the value is the maximum time after a
+  // subscriber receives a message before the subscriber should acknowledge or
+  // Nack the message. If the Ack deadline for a message passes without an
+  // Ack or a Nack, the Pub/Sub system will eventually redeliver the message.
+  // If a subscriber acknowledges after the deadline, the Pub/Sub system may
+  // accept the Ack, but it is possible that the message has been already
+  // delivered again. Multiple Acks to the message are allowed and will
+  // succeed.
+  //
+  // For push delivery, this value is used to set the request timeout for
+  // the call to the push endpoint.
+  //
+  // For pull delivery, this value is used as the initial value for the Ack
+  // deadline. It may be overridden for a specific pull request (message) with
+  // <code>ModifyAckDeadline</code>.
+  // While a message is outstanding (i.e. it has been delivered to a pull
+  // subscriber and the subscriber has not yet Acked or Nacked), the Pub/Sub
+  // system will not deliver that message to another pull subscriber
+  // (on a best-effort basis).
+  optional int32 ack_deadline_seconds = 6;
+
+  // If this parameter is set to n, the system is allowed to (but not required
+  // to) delete the subscription when at least n seconds have elapsed since the
+  // client presence was detected. (Presence is detected through any
+  // interaction using the subscription ID, including Pull(), Get(), or
+  // acknowledging a message.)
+  //
+  // If this parameter is not set, the subscription will stay live until
+  // explicitly deleted.
+  //
+  // Clients can detect such garbage collection when a Get call or a Pull call
+  // (for pull subscribers only) returns NOT_FOUND.
+  optional int64 garbage_collect_seconds = 7;
+}
+
+// Configuration for a push delivery endpoint.
+message PushConfig {
+  // A URL locating the endpoint to which messages should be pushed.
+  // For example, a Webhook endpoint might use "https://example.com/push".
+  // (-- An Android application might use "gcm:<REGID>", where <REGID> is a
+  // GCM registration id allocated for pushing messages to the application. --)
+  optional string push_endpoint = 1;
+}
+
+// An event indicating a received message or truncation event.
+message PubsubEvent {
+  // The subscription that received the event.
+  optional string subscription = 1;
+
+  oneof type {
+    // A received message.
+    PubsubMessage message = 2;
+
+    // Indicates that this subscription has been truncated.
+    bool truncated = 3;
+
+    // Indicates that this subscription has been deleted. (Note that pull
+    // subscribers will always receive NOT_FOUND in response in their pull
+    // request on the subscription, rather than seeing this boolean.)
+    bool deleted = 4;
+  }
+}
+
+// Request for the GetSubscription method.
+message GetSubscriptionRequest {
+  // The name of the subscription to get.
+  optional string subscription = 1;
+}
+
+// Request for the ListSubscriptions method.
+message ListSubscriptionsRequest {
+  // A valid label query expression.
+  // (-- Which labels are required or supported is implementation-specific.
+  // TODO(eschapira): This method must support to query by topic. We must
+  // define the key URI for the "topic" label. --)
+  optional string query = 1;
+
+  // Maximum number of subscriptions to return.
+  // (-- If not specified or <= 0, the implementation will select a reasonable
+  // value. --)
+  optional int32 max_results = 3;
+
+  // The value obtained in the last <code>ListSubscriptionsResponse</code>
+  // for continuation.
+  optional string page_token = 4;
+}
+
+// Response for the ListSubscriptions method.
+message ListSubscriptionsResponse {
+  // The subscriptions that match the request.
+  repeated Subscription subscription = 1;
+
+  // If not empty, indicates that there are more subscriptions that match the
+  // request and this value should be passed to the next
+  // <code>ListSubscriptionsRequest</code> to continue.
+  optional string next_page_token = 2;
+}
+
+// Request for the TruncateSubscription method.
+message TruncateSubscriptionRequest {
+  // The subscription that is being truncated.
+  optional string subscription = 1;
+}
+
+// Request for the DeleteSubscription method.
+message DeleteSubscriptionRequest {
+  // The subscription to delete.
+  optional string subscription = 1;
+}
+
+// Request for the ModifyPushConfig method.
+message ModifyPushConfigRequest {
+  // The name of the subscription.
+  optional string subscription = 1;
+
+  // An empty <code>push_config</code> indicates that the Pub/Sub system should
+  // pause pushing messages from the given subscription.
+  optional PushConfig push_config = 2;
+}
+
+// -----------------------------------------------------------------------------
+// The protos used by a pull subscriber.
+// -----------------------------------------------------------------------------
+
+// Request for the Pull method.
+message PullRequest {
+  // The subscription from which a message should be pulled.
+  optional string subscription = 1;
+
+  // If this is specified as true the system will respond immediately even if
+  // it is not able to return a message in the Pull response. Otherwise the
+  // system is allowed to wait until at least one message is available rather
+  // than returning FAILED_PRECONDITION. The client may cancel the request if
+  // it does not wish to wait any longer for the response.
+  optional bool return_immediately = 2;
+}
+
+// Either a <code>PubsubMessage</code> or a truncation event. One of these two
+// must be populated.
+message PullResponse {
+  // This ID must be used to acknowledge the received event or message.
+  optional string ack_id = 1;
+
+  // A pubsub message or truncation event.
+  optional PubsubEvent pubsub_event = 2;
+}
+
+// Request for the PullBatch method.
+message PullBatchRequest {
+  // The subscription from which messages should be pulled.
+  optional string subscription = 1;
+
+  // If this is specified as true the system will respond immediately even if
+  // it is not able to return a message in the Pull response. Otherwise the
+  // system is allowed to wait until at least one message is available rather
+  // than returning no messages. The client may cancel the request if it does
+  // not wish to wait any longer for the response.
+  optional bool return_immediately = 2;
+
+  // The maximum number of PubsubEvents returned for this request. The Pub/Sub
+  // system may return fewer than the number of events specified.
+  optional int32 max_events = 3;
+}
+
+// Response for the PullBatch method.
+message PullBatchResponse {
+
+  // Received Pub/Sub messages or status events. The Pub/Sub system will return
+  // zero messages if there are no more messages available in the backlog. The
+  // Pub/Sub system may return fewer than the max_events requested even if
+  // there are more messages available in the backlog.
+  repeated PullResponse pull_responses = 2;
+}
+
+// Request for the ModifyAckDeadline method.
+message ModifyAckDeadlineRequest {
+  // The name of the subscription from which messages are being pulled.
+  optional string subscription = 1;
+
+  // The acknowledgment ID.
+  optional string ack_id = 2;
+
+  // The new Ack deadline. Must be >= 0.
+  optional int32 ack_deadline_seconds = 3;
+}
+
+// Request for the Acknowledge method.
+message AcknowledgeRequest {
+  // The subscription whose message is being acknowledged.
+  optional string subscription = 1;
+
+  // The acknowledgment ID for the message being acknowledged. This was
+  // returned by the Pub/Sub system in the Pull response.
+  repeated string ack_id = 2;
+}
+
+// Request for the Nack method.
+message NackRequest {
+  // The subscription whose message is being Nacked.
+  optional string subscription = 1;
+
+  // The acknowledgment ID for the message being refused. This was returned by
+  // the Pub/Sub system in the Pull response.
+  repeated string ack_id = 2;
+}
+
+// -----------------------------------------------------------------------------
+// The service and protos used by a push subscriber.
+// -----------------------------------------------------------------------------
+
+// The service that a subscriber uses to handle messages sent via push
+// delivery.
+// This service is not currently exported for HTTP clients.
+// TODO(eschapira): Explain HTTP subscribers.
+service PushEndpointService {
+  // Sends a <code>PubsubMessage</code> or a subscription status event to a
+  // push endpoint.
+  // The push endpoint responds with an empty message and a code from
+  // util/task/codes.proto. The following codes have a particular meaning to the
+  // Pub/Sub system:
+  // OK          - This is interpreted by Pub/Sub as Ack.
+  // ABORTED     - This is intepreted by Pub/Sub as a Nack, without implying
+  //               pushback for congestion control.  The Pub/Sub system will
+  //               retry this message at a later time.
+  // UNAVAILABLE - This is intepreted by Pub/Sub as a Nack, with the additional
+  //               semantics of push-back.  The Pub/Sub system will use an AIMD
+  //               congestion control algorithm to backoff the rate of sending
+  //               messages from this subscription.
+  // Any other code, or a failure to respond, will be interpreted in the same
+  // way as ABORTED; i.e. the system will retry the message at a later time to
+  // ensure reliable delivery.
+  rpc HandlePubsubEvent(PubsubEvent) returns (proto2.Empty);
+}
diff --git a/src/node/examples/pubsub/pubsub_demo.js b/src/node/examples/pubsub/pubsub_demo.js
new file mode 100644
index 0000000000..a9b6acbd7e
--- /dev/null
+++ b/src/node/examples/pubsub/pubsub_demo.js
@@ -0,0 +1,277 @@
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+var async = require('async');
+var fs = require('fs');
+var GoogleAuth = require('googleauth');
+var parseArgs = require('minimist');
+var strftime = require('strftime');
+var _ = require('underscore');
+var grpc = require('../..');
+var PROTO_PATH = __dirname + '/pubsub.proto';
+var pubsub = grpc.load(PROTO_PATH).tech.pubsub;
+
+function PubsubRunner(pub, sub, args) {
+  this.pub = pub;
+  this.sub = sub;
+  this.args = args;
+}
+
+PubsubRunner.prototype.getTestTopicName = function() {
+  var base_name = '/topics/' + this.args.project_id + '/';
+  if (this.args.topic_name) {
+    return base_name + this.args.topic_name;
+  }
+  var now_text = strftime('%Y%m%d%H%M%S%L');
+  return base_name + process.env.USER + '-' + now_text;
+};
+
+PubsubRunner.prototype.getTestSubName = function() {
+  var base_name = '/subscriptions/' + this.args.project_id + '/';
+  if (this.args.sub_name) {
+    return base_name + this.args.sub_name;
+  }
+  var now_text = strftime('%Y%m%d%H%M%S%L');
+  return base_name + process.env.USER + '-' + now_text;
+};
+
+PubsubRunner.prototype.listProjectTopics = function(callback) {
+  var q = ('cloud.googleapis.com/project in (/projects/' +
+      this.args.project_id + ')');
+  this.pub.listTopics({query: q}, callback);
+};
+
+PubsubRunner.prototype.topicExists = function(name, callback) {
+  this.listProjectTopics(function(err, response) {
+    if (err) {
+      callback(err);
+    } else {
+      callback(null, _.some(response.topic, function(t) {
+        return t.name === name;
+      }));
+    }
+  });
+};
+
+PubsubRunner.prototype.createTopicIfNeeded = function(name, callback) {
+  var self = this;
+  this.topicExists(name, function(err, exists) {
+    if (err) {
+      callback(err);
+    } else{
+      if (exists) {
+        callback(null);
+      } else {
+        self.pub.createTopic({name: name}, callback);
+      }
+    }
+  });
+};
+
+PubsubRunner.prototype.removeTopic = function(callback) {
+  var name = this.getTestTopicName();
+  console.log('... removing Topic', name);
+  this.pub.deleteTopic({topic: name}, function(err, value) {
+    if (err) {
+      console.log('Could not delete a topic: rpc failed with', err);
+      callback(err);
+    } else {
+      console.log('removed Topic', name, 'OK');
+      callback(null);
+    }
+  });
+};
+
+PubsubRunner.prototype.createTopic = function(callback) {
+  var name = this.getTestTopicName();
+  console.log('... creating Topic', name);
+  this.pub.createTopic({name: name}, function(err, value) {
+    if (err) {
+      console.log('Could not create a topic: rpc failed with', err);
+      callback(err);
+    } else {
+      console.log('created Topic', name, 'OK');
+      callback(null);
+    }
+  });
+};
+
+PubsubRunner.prototype.listSomeTopics = function(callback) {
+  console.log('Listing topics');
+  console.log('-------------_');
+  this.listProjectTopics(function(err, response) {
+    if (err) {
+      console.log('Could not list topic: rpc failed with', err);
+      callback(err);
+    } else {
+      _.each(response.topic, function(t) {
+        console.log(t.name);
+      });
+      callback(null);
+    }
+  });
+};
+
+PubsubRunner.prototype.checkExists = function(callback) {
+  var name = this.getTestTopicName();
+  console.log('... checking for topic', name);
+  this.topicExists(name, function(err, exists) {
+    if (err) {
+      console.log('Could not check for a topics: rpc failed with', err);
+      callback(err);
+    } else {
+      if (exists) {
+        console.log(name, 'is a topic');
+      } else {
+        console.log(name, 'is not a topic');
+      }
+      callback(null);
+    }
+  });
+};
+
+PubsubRunner.prototype.randomPubSub = function(callback) {
+  var self = this;
+  var topic_name = this.getTestTopicName();
+  var sub_name = this.getTestSubName();
+  var subscription = {name: sub_name, topic: topic_name};
+  async.waterfall([
+    _.bind(this.createTopicIfNeeded, this, topic_name),
+    _.bind(this.sub.createSubscription, this.sub, subscription),
+    function(resp, cb) {
+      var msg_count = _.random(10, 30);
+      // Set up msg_count messages to publish
+      var message_senders = _.times(msg_count, function(n) {
+        return _.bind(self.pub.publish, self.pub, {
+          topic: topic_name,
+          message: {data: new Buffer('message ' + n)}
+        });
+      });
+      async.parallel(message_senders, function(err, result) {
+        cb(err, result, msg_count);
+      });
+    },
+    function(result, msg_count, cb) {
+      console.log('Sent', msg_count, 'messages to', topic_name + ',',
+                  'checking for them now.');
+      var batch_request = {
+        subscription: sub_name,
+        max_events: msg_count
+      };
+      self.sub.pullBatch(batch_request, cb);
+    },
+    function(batch, cb) {
+      var ack_id = _.pluck(batch.pull_responses, 'ack_id');
+      console.log('Got', ack_id.length, 'messages, acknowledging them...');
+      var ack_request = {
+        subscription: sub_name,
+        ack_id: ack_id
+      };
+      self.sub.acknowledge(ack_request, cb);
+    },
+    function(result, cb) {
+      console.log(
+          'Test messages were acknowledged OK, deleting the subscription');
+      self.sub.deleteSubscription({subscription: sub_name}, cb);
+    }
+  ], function (err, result) {
+    if (err) {
+      console.log('Could not do random pub sub: rpc failed with', err);
+    }
+    callback(err, result);
+  });
+};
+
+function main(callback) {
+  var argv = parseArgs(process.argv, {
+    string: [
+      'host',
+      'oauth_scope',
+      'port',
+      'action',
+      'project_id',
+      'topic_name',
+      'sub_name'
+    ],
+    default: {
+      host: 'pubsub-staging.googleapis.com',
+      oauth_scope: 'https://www.googleapis.com/auth/pubsub',
+      port: 443,
+      action: 'listSomeTopics',
+      project_id: 'stoked-keyword-656'
+    }
+  });
+  var valid_actions = [
+    'createTopic',
+    'removeTopic',
+    'listSomeTopics',
+    'checkExists',
+    'randomPubSub'
+  ];
+  if (_.some(valid_actions, function(action) {
+    return action === argv.action;
+  })) {
+    callback(new Error('Action was not valid'));
+  }
+  var address = argv.host + ':' + argv.port;
+  (new GoogleAuth()).getApplicationDefault(function(err, credential) {
+    if (err) {
+      callback(err);
+      return;
+    }
+    if (credential.createScopedRequired()) {
+      credential = credential.createScoped(argv.oauth_scope);
+    }
+    var updateMetadata = grpc.getGoogleAuthDelegate(credential);
+    var ca_path = process.env.SSL_CERT_FILE;
+    fs.readFile(ca_path, function(err, ca_data) {
+      if (err) {
+        callback(err);
+        return;
+      }
+      var ssl_creds = grpc.Credentials.createSsl(ca_data);
+      var options = {
+        credentials: ssl_creds,
+        'grpc.ssl_target_name_override': argv.host
+      };
+      var pub = new pubsub.PublisherService(address, options, updateMetadata);
+      var sub = new pubsub.SubscriberService(address, options, updateMetadata);
+      var runner = new PubsubRunner(pub, sub, argv);
+      runner[argv.action](callback);
+    });
+  });
+}
+
+if (require.main === module) {
+  main(function(err) {
+    if (err) throw err;
+  });
+}
+
+module.exports = PubsubRunner;
diff --git a/src/node/package.json b/src/node/package.json
index 70327941ee..e6ac550554 100644
--- a/src/node/package.json
+++ b/src/node/package.json
@@ -18,7 +18,8 @@
     "async": "^0.9.0",
     "googleauth": "google/google-auth-library-nodejs",
     "minimist": "^1.1.0",
-    "mocha": "~1.21.0"
+    "mocha": "~1.21.0",
+    "strftime": "^0.8.2"
   },
   "files": [
     "README.md",
diff --git a/src/objective-c/GRPCClient/GRPCClient.podspec b/src/objective-c/GRPCClient/GRPCClient.podspec
new file mode 100644
index 0000000000..a34c50b54e
--- /dev/null
+++ b/src/objective-c/GRPCClient/GRPCClient.podspec
@@ -0,0 +1,14 @@
+Pod::Spec.new do |s|
+  s.name         = 'GRPCClient'
+  s.version      = '0.0.1'
+  s.summary      = 'Generic gRPC client library for iOS'
+  s.author = {
+    'Jorge Canizales' => 'jcanizales@google.com'
+  }
+  s.source_files = '*.{h,m}', 'private/*.{h,m}'
+  s.private_header_files = 'private/*.h'
+  s.platform = :ios
+  s.ios.deployment_target = '6.0'
+  s.requires_arc = true
+  s.dependency 'RxLibrary', '~> 0.0'
+end
diff --git a/src/objective-c/examples/Sample/Podfile b/src/objective-c/examples/Sample/Podfile
index fa98987910..2b142a67d0 100644
--- a/src/objective-c/examples/Sample/Podfile
+++ b/src/objective-c/examples/Sample/Podfile
@@ -2,6 +2,7 @@ source 'https://github.com/CocoaPods/Specs.git'
 platform :ios, '8.0'
 
 pod 'RxLibrary', :path => "../../RxLibrary"
+pod 'GRPCClient', :path => "../../GRPCClient"
 
 target 'Sample' do
 
diff --git a/src/objective-c/examples/Sample/Podfile.lock b/src/objective-c/examples/Sample/Podfile.lock
index fee4b43bec..7fa4f5d547 100644
--- a/src/objective-c/examples/Sample/Podfile.lock
+++ b/src/objective-c/examples/Sample/Podfile.lock
@@ -1,14 +1,20 @@
 PODS:
+  - GRPCClient (0.0.1):
+    - RxLibrary (~> 0.0)
   - RxLibrary (0.0.1)
 
 DEPENDENCIES:
+  - GRPCClient (from `../../GRPCClient`)
   - RxLibrary (from `../../RxLibrary`)
 
 EXTERNAL SOURCES:
+  GRPCClient:
+    :path: ../../GRPCClient
   RxLibrary:
     :path: ../../RxLibrary
 
 SPEC CHECKSUMS:
+  GRPCClient: 05c58faab99661384178bb7c5f93b60c2bfc89f8
   RxLibrary: 70cfcf1573ec16a375b4fe61d976a3188aab9303
 
 COCOAPODS: 0.35.0
diff --git a/src/objective-c/examples/Sample/Pods/Headers/Public/GRPCClient/GRPCCall.h b/src/objective-c/examples/Sample/Pods/Headers/Public/GRPCClient/GRPCCall.h
new file mode 120000
index 0000000000..cacb26174f
--- /dev/null
+++ b/src/objective-c/examples/Sample/Pods/Headers/Public/GRPCClient/GRPCCall.h
@@ -0,0 +1 @@
+../../../../../../GRPCClient/GRPCCall.h
\ No newline at end of file
diff --git a/src/objective-c/examples/Sample/Pods/Headers/Public/GRPCClient/GRPCMethodName.h b/src/objective-c/examples/Sample/Pods/Headers/Public/GRPCClient/GRPCMethodName.h
new file mode 120000
index 0000000000..4dddbd8955
--- /dev/null
+++ b/src/objective-c/examples/Sample/Pods/Headers/Public/GRPCClient/GRPCMethodName.h
@@ -0,0 +1 @@
+../../../../../../GRPCClient/GRPCMethodName.h
\ No newline at end of file
diff --git a/src/objective-c/examples/Sample/Pods/Local Podspecs/GRPCClient.podspec b/src/objective-c/examples/Sample/Pods/Local Podspecs/GRPCClient.podspec
new file mode 100644
index 0000000000..a34c50b54e
--- /dev/null
+++ b/src/objective-c/examples/Sample/Pods/Local Podspecs/GRPCClient.podspec
@@ -0,0 +1,14 @@
+Pod::Spec.new do |s|
+  s.name         = 'GRPCClient'
+  s.version      = '0.0.1'
+  s.summary      = 'Generic gRPC client library for iOS'
+  s.author = {
+    'Jorge Canizales' => 'jcanizales@google.com'
+  }
+  s.source_files = '*.{h,m}', 'private/*.{h,m}'
+  s.private_header_files = 'private/*.h'
+  s.platform = :ios
+  s.ios.deployment_target = '6.0'
+  s.requires_arc = true
+  s.dependency 'RxLibrary', '~> 0.0'
+end
diff --git a/src/objective-c/examples/Sample/Pods/Manifest.lock b/src/objective-c/examples/Sample/Pods/Manifest.lock
index fee4b43bec..7fa4f5d547 100644
--- a/src/objective-c/examples/Sample/Pods/Manifest.lock
+++ b/src/objective-c/examples/Sample/Pods/Manifest.lock
@@ -1,14 +1,20 @@
 PODS:
+  - GRPCClient (0.0.1):
+    - RxLibrary (~> 0.0)
   - RxLibrary (0.0.1)
 
 DEPENDENCIES:
+  - GRPCClient (from `../../GRPCClient`)
   - RxLibrary (from `../../RxLibrary`)
 
 EXTERNAL SOURCES:
+  GRPCClient:
+    :path: ../../GRPCClient
   RxLibrary:
     :path: ../../RxLibrary
 
 SPEC CHECKSUMS:
+  GRPCClient: 05c58faab99661384178bb7c5f93b60c2bfc89f8
   RxLibrary: 70cfcf1573ec16a375b4fe61d976a3188aab9303
 
 COCOAPODS: 0.35.0
diff --git a/src/objective-c/examples/Sample/Pods/Pods.xcodeproj/project.pbxproj b/src/objective-c/examples/Sample/Pods/Pods.xcodeproj/project.pbxproj
index 68290dd5e8..b6f4c37b93 100644
--- a/src/objective-c/examples/Sample/Pods/Pods.xcodeproj/project.pbxproj
+++ b/src/objective-c/examples/Sample/Pods/Pods.xcodeproj/project.pbxproj
@@ -10,54 +10,186 @@
 	<string>46</string>
 	<key>objects</key>
 	<dict>
-		<key>00949E44051CD97851DEFF3B</key>
+		<key>00303CC3049D1C9E8709A044</key>
+		<dict>
+			<key>explicitFileType</key>
+			<string>archive.ar</string>
+			<key>includeInIndex</key>
+			<string>0</string>
+			<key>isa</key>
+			<string>PBXFileReference</string>
+			<key>path</key>
+			<string>libPods-RxLibrary.a</string>
+			<key>sourceTree</key>
+			<string>BUILT_PRODUCTS_DIR</string>
+		</dict>
+		<key>003D718984A073D9C6C71422</key>
+		<dict>
+			<key>includeInIndex</key>
+			<string>1</string>
+			<key>isa</key>
+			<string>PBXFileReference</string>
+			<key>lastKnownFileType</key>
+			<string>sourcecode.c.h</string>
+			<key>name</key>
+			<string>GRPCDelegateWrapper.h</string>
+			<key>path</key>
+			<string>private/GRPCDelegateWrapper.h</string>
+			<key>sourceTree</key>
+			<string>&lt;group&gt;</string>
+		</dict>
+		<key>0041F7F38D0B99E977EC7A9B</key>
+		<dict>
+			<key>baseConfigurationReference</key>
+			<string>02396B6B22E0450EA29193E9</string>
+			<key>buildSettings</key>
+			<dict>
+				<key>ALWAYS_SEARCH_USER_PATHS</key>
+				<string>NO</string>
+				<key>COPY_PHASE_STRIP</key>
+				<string>YES</string>
+				<key>DSTROOT</key>
+				<string>/tmp/xcodeproj.dst</string>
+				<key>GCC_PRECOMPILE_PREFIX_HEADER</key>
+				<string>YES</string>
+				<key>GCC_PREFIX_HEADER</key>
+				<string>Target Support Files/Pods-RxLibrary/Pods-RxLibrary-prefix.pch</string>
+				<key>INSTALL_PATH</key>
+				<string>$(BUILT_PRODUCTS_DIR)</string>
+				<key>IPHONEOS_DEPLOYMENT_TARGET</key>
+				<string>8.0</string>
+				<key>OTHER_CFLAGS</key>
+				<array>
+					<string>-DNS_BLOCK_ASSERTIONS=1</string>
+					<string>$(inherited)</string>
+				</array>
+				<key>OTHER_CPLUSPLUSFLAGS</key>
+				<array>
+					<string>-DNS_BLOCK_ASSERTIONS=1</string>
+					<string>$(inherited)</string>
+				</array>
+				<key>OTHER_LDFLAGS</key>
+				<string></string>
+				<key>OTHER_LIBTOOLFLAGS</key>
+				<string></string>
+				<key>PRODUCT_NAME</key>
+				<string>$(TARGET_NAME)</string>
+				<key>PUBLIC_HEADERS_FOLDER_PATH</key>
+				<string>$(TARGET_NAME)</string>
+				<key>SDKROOT</key>
+				<string>iphoneos</string>
+				<key>SKIP_INSTALL</key>
+				<string>YES</string>
+				<key>VALIDATE_PRODUCT</key>
+				<string>YES</string>
+			</dict>
+			<key>isa</key>
+			<string>XCBuildConfiguration</string>
+			<key>name</key>
+			<string>Release</string>
+		</dict>
+		<key>00669D4383CB42C429D06591</key>
 		<dict>
 			<key>fileRef</key>
-			<string>9CFAC09E370EA1C96C8D2880</string>
+			<string>D0641C22EEADF13905743122</string>
 			<key>isa</key>
 			<string>PBXBuildFile</string>
 		</dict>
-		<key>01F5B724A99ADB3547023C72</key>
+		<key>0104C23B56A2F6D406AD513A</key>
+		<dict>
+			<key>includeInIndex</key>
+			<string>1</string>
+			<key>isa</key>
+			<string>PBXFileReference</string>
+			<key>lastKnownFileType</key>
+			<string>sourcecode.c.h</string>
+			<key>name</key>
+			<string>Pods-Sample-GRPCClient-prefix.pch</string>
+			<key>path</key>
+			<string>../Pods-Sample-GRPCClient/Pods-Sample-GRPCClient-prefix.pch</string>
+			<key>sourceTree</key>
+			<string>&lt;group&gt;</string>
+		</dict>
+		<key>01E37BE5C7114E128C4664FB</key>
 		<dict>
 			<key>fileRef</key>
-			<string>1868370C0050315A6B835D42</string>
+			<string>9470FB5E010191C87542871D</string>
 			<key>isa</key>
 			<string>PBXBuildFile</string>
 		</dict>
-		<key>0239F1B46D24E21A8042F47F</key>
+		<key>02396B6B22E0450EA29193E9</key>
 		<dict>
-			<key>buildConfigurationList</key>
-			<string>8919AE774852DD128A7CB510</string>
-			<key>buildPhases</key>
-			<array>
-				<string>A71CC1B520D2DFF451839FE2</string>
-				<string>896F697BD1BEAF8A081337EB</string>
-			</array>
-			<key>buildRules</key>
-			<array/>
-			<key>dependencies</key>
-			<array>
-				<string>6EB14BC96525C955FBD5CC75</string>
-			</array>
+			<key>includeInIndex</key>
+			<string>1</string>
 			<key>isa</key>
-			<string>PBXNativeTarget</string>
+			<string>PBXFileReference</string>
+			<key>lastKnownFileType</key>
+			<string>text.xcconfig</string>
+			<key>path</key>
+			<string>Pods-RxLibrary-Private.xcconfig</string>
+			<key>sourceTree</key>
+			<string>&lt;group&gt;</string>
+		</dict>
+		<key>03289193476D7E6EE456FAA8</key>
+		<dict>
+			<key>fileRef</key>
+			<string>16D5B426090D302B58B8FF40</string>
+			<key>isa</key>
+			<string>PBXBuildFile</string>
+		</dict>
+		<key>041582131ADE9EA5C2A319BB</key>
+		<dict>
+			<key>isa</key>
+			<string>PBXTargetDependency</string>
 			<key>name</key>
-			<string>Pods-Sample</string>
-			<key>productName</key>
-			<string>Pods-Sample</string>
-			<key>productReference</key>
-			<string>DF94410F5DC0A0AB69336DF4</string>
-			<key>productType</key>
-			<string>com.apple.product-type.library.static</string>
+			<string>Pods-SampleTests-RxLibrary</string>
+			<key>target</key>
+			<string>474A50F85C06F74769FAD474</string>
+			<key>targetProxy</key>
+			<string>FBC9D2D66DA1B0B501961B55</string>
+		</dict>
+		<key>048EFCCABBC3F25828644716</key>
+		<dict>
+			<key>includeInIndex</key>
+			<string>1</string>
+			<key>isa</key>
+			<string>PBXFileReference</string>
+			<key>lastKnownFileType</key>
+			<string>text.xcconfig</string>
+			<key>path</key>
+			<string>Pods-SampleTests.debug.xcconfig</string>
+			<key>sourceTree</key>
+			<string>&lt;group&gt;</string>
 		</dict>
-		<key>024F840533A6674922DB7899</key>
+		<key>077EB8C42818FBCCF960B6A2</key>
 		<dict>
 			<key>fileRef</key>
-			<string>46513F4AD14CBD2377C1E7A1</string>
+			<string>0B083D6614A831642ECCDB95</string>
 			<key>isa</key>
 			<string>PBXBuildFile</string>
 		</dict>
-		<key>0260773D27B4AE159FB0B22D</key>
+		<key>078103DC988BEF03083FEB98</key>
+		<dict>
+			<key>fileRef</key>
+			<string>D0641C22EEADF13905743122</string>
+			<key>isa</key>
+			<string>PBXBuildFile</string>
+		</dict>
+		<key>07DA0CCF4F2346740326BD7D</key>
+		<dict>
+			<key>fileRef</key>
+			<string>9470FB5E010191C87542871D</string>
+			<key>isa</key>
+			<string>PBXBuildFile</string>
+		</dict>
+		<key>0843899658450810B81AC1DD</key>
+		<dict>
+			<key>fileRef</key>
+			<string>66A375345A9F319AE182BDBD</string>
+			<key>isa</key>
+			<string>PBXBuildFile</string>
+		</dict>
+		<key>09759845E529CE5CD00BECA5</key>
 		<dict>
 			<key>includeInIndex</key>
 			<string>1</string>
@@ -65,32 +197,117 @@
 			<string>PBXFileReference</string>
 			<key>lastKnownFileType</key>
 			<string>sourcecode.c.h</string>
+			<key>name</key>
+			<string>Pods-SampleTests-RxLibrary-prefix.pch</string>
 			<key>path</key>
-			<string>GRXWriter+Immediate.h</string>
+			<string>../Pods-SampleTests-RxLibrary/Pods-SampleTests-RxLibrary-prefix.pch</string>
+			<key>sourceTree</key>
+			<string>&lt;group&gt;</string>
+		</dict>
+		<key>098BE814C7B5F9F21878CDE6</key>
+		<dict>
+			<key>baseConfigurationReference</key>
+			<string>3369A2EF668725CAF3F75D1F</string>
+			<key>buildSettings</key>
+			<dict>
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-			<string>Targets Support Files</string>
-			<key>sourceTree</key>
-			<string>&lt;group&gt;</string>
+			<string>PBXSourcesBuildPhase</string>
+			<key>runOnlyForDeploymentPostprocessing</key>
+			<string>0</string>
 		</dict>
-		<key>F2C6AACFE46FFA8DC383DE43</key>
+		<key>F156B1B8573809A342E0AE1F</key>
 		<dict>
 			<key>fileRef</key>
-			<string>0D53085043D992DC00E29F0A</string>
+			<string>CEA794A7056AFAB8256CC44D</string>
 			<key>isa</key>
 			<string>PBXBuildFile</string>
 		</dict>
-		<key>F6383D21195A5BEFC51F6618</key>
+		<key>F2B5B896D8C7E13B5E8ADA28</key>
 		<dict>
 			<key>fileRef</key>
-			<string>BDA58E5E1AE450540A2B0227</string>
+			<string>E0CF2237012441B69E760029</string>
 			<key>isa</key>
 			<string>PBXBuildFile</string>
 		</dict>
-		<key>F6C59E5B4CFE053E9F98000E</key>
+		<key>F37E3DFDFA20082CBC4E2257</key>
 		<dict>
-			<key>buildConfigurationList</key>
-			<string>17F4C2F25813E7A4588FF233</string>
-			<key>buildPhases</key>
-			<array>
-				<string>BFE770FF3C0847AB995A82CA</string>
-				<string>1146D04C598DEBA045C96C2F</string>
-				<string>9E8DC61269B141639DA7F859</string>
-			</array>
-			<key>buildRules</key>
-			<array/>
-			<key>dependencies</key>
-			<array/>
+			<key>fileRef</key>
+			<string>6BBDA0AD2955451BBF881052</string>
 			<key>isa</key>
-			<string>PBXNativeTarget</string>
-			<key>name</key>
-			<string>Pods-Sample-RxLibrary</string>
-			<key>productName</key>
-			<string>Pods-Sample-RxLibrary</string>
-			<key>productReference</key>
-			<string>EF2EE4BC906FF9909348DAB5</string>
-			<key>productType</key>
-			<string>com.apple.product-type.library.static</string>
+			<string>PBXBuildFile</string>
 		</dict>
-		<key>F763F3DF1B47888E75D0ED9C</key>
+		<key>F4586BA420EA562FECC43A3A</key>
+		<dict>
+			<key>fileRef</key>
+			<string>A7CE4BCE7B6959BCDC54B854</string>
+			<key>isa</key>
+			<string>PBXBuildFile</string>
+		</dict>
+		<key>F541961867C9493F07D54B8E</key>
 		<dict>
 			<key>includeInIndex</key>
 			<string>1</string>
@@ -2780,109 +4416,167 @@
 			<string>PBXFileReference</string>
 			<key>lastKnownFileType</key>
 			<string>sourcecode.c.objc</string>
+			<key>name</key>
+			<string>GRPCDelegateWrapper.m</string>
 			<key>path</key>
-			<string>GRXWriter+Transformations.m</string>
+			<string>private/GRPCDelegateWrapper.m</string>
 			<key>sourceTree</key>
 			<string>&lt;group&gt;</string>
 		</dict>
-		<key>F779618174957BE31FCCDE56</key>
+		<key>F636FFBF62AFF197BE3CB427</key>
 		<dict>
-			<key>buildActionMask</key>
-			<string>2147483647</string>
-			<key>files</key>
+			<key>fileRef</key>
+			<string>34373F1941450D17C3F85B57</string>
+			<key>isa</key>
+			<string>PBXBuildFile</string>
+		</dict>
+		<key>F6A0AD6C190915DD52886BE2</key>
+		<dict>
+			<key>buildConfigurations</key>
 			<array>
-				<string>2B49DCA723ECBC0F2777B960</string>
-				<string>22531AF83592134D3879C3E1</string>
-				<string>0C57EED724EBF58759F9F6DF</string>
-				<string>8CD061F02F905957F4C1D188</string>
-				<string>458FF1EEF4EB9646C699F3DD</string>
-				<string>2B341576464148A01DCFB28B</string>
-				<string>36FF37EAC7E918C4CD867776</string>
-				<string>594F98D43B96AB5C11E61C10</string>
-				<string>B78477CA74AEFC96C25B49B4</string>
-				<string>9CCBE9A628C305B3B089B8DD</string>
-				<string>801BBA7A538CFAE6746966A7</string>
+				<string>EE85C49640E6202C2A33CDF6</string>
+				<string>ED9460BEAAB47A2752887CE9</string>
 			</array>
-			<key>isa</key>
-			<string>PBXSourcesBuildPhase</string>
-			<key>runOnlyForDeploymentPostprocessing</key>
+			<key>defaultConfigurationIsVisible</key>
 			<string>0</string>
+			<key>defaultConfigurationName</key>
+			<string>Release</string>
+			<key>isa</key>
+			<string>XCConfigurationList</string>
 		</dict>
-		<key>F8B4778EF3030EEC2E9927CE</key>
+		<key>F6B6558E339AD89F764A6D88</key>
 		<dict>
+			<key>includeInIndex</key>
+			<string>1</string>
 			<key>isa</key>
-			<string>PBXTargetDependency</string>
+			<string>PBXFileReference</string>
+			<key>lastKnownFileType</key>
+			<string>text.xcconfig</string>
 			<key>name</key>
-			<string>Pods-SampleTests-RxLibrary</string>
-			<key>target</key>
-			<string>3800855A656C8D0813062074</string>
-			<key>targetProxy</key>
-			<string>7DA2A517A18D85B390FB122A</string>
+			<string>Pods-Sample-RxLibrary.xcconfig</string>
+			<key>path</key>
+			<string>../Pods-Sample-RxLibrary/Pods-Sample-RxLibrary.xcconfig</string>
+			<key>sourceTree</key>
+			<string>&lt;group&gt;</string>
 		</dict>
-		<key>FBF79DDF04ADEAED54BA2286</key>
+		<key>F776B445ABD393C908B02302</key>
 		<dict>
-			<key>attributes</key>
-			<dict>
-				<key>LastUpgradeCheck</key>
-				<string>0510</string>
-			</dict>
-			<key>buildConfigurationList</key>
-			<string>3749A34D3DFA6E2F3539E546</string>
-			<key>compatibilityVersion</key>
-			<string>Xcode 3.2</string>
-			<key>developmentRegion</key>
-			<string>English</string>
-			<key>hasScannedForEncodings</key>
-			<string>0</string>
+			<key>includeInIndex</key>
+			<string>1</string>
 			<key>isa</key>
-			<string>PBXProject</string>
-			<key>knownRegions</key>
-			<array>
-				<string>en</string>
-			</array>
-			<key>mainGroup</key>
-			<string>397A12919FB4BDD608FE207C</string>
-			<key>productRefGroup</key>
-			<string>8B05D39455D5B23720961FA4</string>
-			<key>projectDirPath</key>
-			<string></string>
-			<key>projectReferences</key>
-			<array/>
-			<key>projectRoot</key>
-			<string></string>
-			<key>targets</key>
-			<array>
-				<string>26E6ACBF137DBC325B4E7DA7</string>
-				<string>6BFD156F312F6CAA1E5B00CA</string>
-				<string>0239F1B46D24E21A8042F47F</string>
-				<string>F6C59E5B4CFE053E9F98000E</string>
-				<string>14D92BB2ED12213381BD2EB9</string>
-				<string>3800855A656C8D0813062074</string>
-			</array>
+			<string>PBXFileReference</string>
+			<key>lastKnownFileType</key>
+			<string>sourcecode.c.h</string>
+			<key>path</key>
+			<string>GRXWriter+Transformations.h</string>
+			<key>sourceTree</key>
+			<string>&lt;group&gt;</string>
 		</dict>
-		<key>FC1BEDED07CA4D91AFEB56BD</key>
+		<key>F84427B4C72738E045D44E6C</key>
 		<dict>
 			<key>fileRef</key>
-			<string>57AC9BF19B9635D7476CA5FA</string>
+			<string>E0CF2237012441B69E760029</string>
 			<key>isa</key>
 			<string>PBXBuildFile</string>
 		</dict>
-		<key>FDC6B84EAC9989F0827EA4F3</key>
+		<key>F911880EC1D908050569F8AF</key>
 		<dict>
 			<key>fileRef</key>
-			<string>0260773D27B4AE159FB0B22D</string>
+			<string>3E850442224A3D7C7540C6C5</string>
 			<key>isa</key>
 			<string>PBXBuildFile</string>
 		</dict>
-		<key>FDC939796E70DC7D141E29FC</key>
+		<key>FA5E9BC13067F1E32D6311E6</key>
 		<dict>
 			<key>fileRef</key>
-			<string>DB0257E62EC33F3F316EF017</string>
+			<string>FB880554D85130C733402058</string>
 			<key>isa</key>
 			<string>PBXBuildFile</string>
 		</dict>
+		<key>FB880554D85130C733402058</key>
+		<dict>
+			<key>includeInIndex</key>
+			<string>1</string>
+			<key>isa</key>
+			<string>PBXFileReference</string>
+			<key>lastKnownFileType</key>
+			<string>sourcecode.c.objc</string>
+			<key>name</key>
+			<string>GRPCChannel.m</string>
+			<key>path</key>
+			<string>private/GRPCChannel.m</string>
+			<key>sourceTree</key>
+			<string>&lt;group&gt;</string>
+		</dict>
+		<key>FBC9D2D66DA1B0B501961B55</key>
+		<dict>
+			<key>containerPortal</key>
+			<string>E61F9CBEB0CA9A172C4AA56B</string>
+			<key>isa</key>
+			<string>PBXContainerItemProxy</string>
+			<key>proxyType</key>
+			<string>1</string>
+			<key>remoteGlobalIDString</key>
+			<string>474A50F85C06F74769FAD474</string>
+			<key>remoteInfo</key>
+			<string>Pods-SampleTests-RxLibrary</string>
+		</dict>
+		<key>FD9953A9B079B03396B2FEA3</key>
+		<dict>
+			<key>fileRef</key>
+			<string>F541961867C9493F07D54B8E</string>
+			<key>isa</key>
+			<string>PBXBuildFile</string>
+		</dict>
+		<key>FE333C59E3BD0F9986105E29</key>
+		<dict>
+			<key>containerPortal</key>
+			<string>E61F9CBEB0CA9A172C4AA56B</string>
+			<key>isa</key>
+			<string>PBXContainerItemProxy</string>
+			<key>proxyType</key>
+			<string>1</string>
+			<key>remoteGlobalIDString</key>
+			<string>474A50F85C06F74769FAD474</string>
+			<key>remoteInfo</key>
+			<string>Pods-SampleTests-RxLibrary</string>
+		</dict>
+		<key>FF34F6701990B0955422EC9C</key>
+		<dict>
+			<key>buildConfigurations</key>
+			<array>
+				<string>EBB8787CD50E6221A0ABA3AE</string>
+				<string>0041F7F38D0B99E977EC7A9B</string>
+			</array>
+			<key>defaultConfigurationIsVisible</key>
+			<string>0</string>
+			<key>defaultConfigurationName</key>
+			<string>Release</string>
+			<key>isa</key>
+			<string>XCConfigurationList</string>
+		</dict>
+		<key>FF378D56A81AE6EFC739CDE6</key>
+		<dict>
+			<key>fileRef</key>
+			<string>617AA57F150724B1881EC92E</string>
+			<key>isa</key>
+			<string>PBXBuildFile</string>
+		</dict>
+		<key>FFC668E9994CC6407B338F9D</key>
+		<dict>
+			<key>includeInIndex</key>
+			<string>1</string>
+			<key>isa</key>
+			<string>PBXFileReference</string>
+			<key>lastKnownFileType</key>
+			<string>text.plist.xml</string>
+			<key>path</key>
+			<string>Pods-acknowledgements.plist</string>
+			<key>sourceTree</key>
+			<string>&lt;group&gt;</string>
+		</dict>
 	</dict>
 	<key>rootObject</key>
-	<string>FBF79DDF04ADEAED54BA2286</string>
+	<string>E61F9CBEB0CA9A172C4AA56B</string>
 </dict>
 </plist>
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-GRPCClient/Pods-GRPCClient-Private.xcconfig b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-GRPCClient/Pods-GRPCClient-Private.xcconfig
new file mode 100644
index 0000000000..27df354315
--- /dev/null
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-GRPCClient/Pods-GRPCClient-Private.xcconfig
@@ -0,0 +1,5 @@
+#include "Pods-GRPCClient.xcconfig"
+GCC_PREPROCESSOR_DEFINITIONS = $(inherited) COCOAPODS=1
+HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Build" "${PODS_ROOT}/Headers/Build/GRPCClient" "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/GRPCClient" "${PODS_ROOT}/Headers/Public/RxLibrary"
+OTHER_LDFLAGS = -ObjC
+PODS_ROOT = ${SRCROOT}
\ No newline at end of file
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-GRPCClient/Pods-GRPCClient-dummy.m b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-GRPCClient/Pods-GRPCClient-dummy.m
new file mode 100644
index 0000000000..8cac89bb84
--- /dev/null
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-GRPCClient/Pods-GRPCClient-dummy.m
@@ -0,0 +1,5 @@
+#import <Foundation/Foundation.h>
+@interface PodsDummy_Pods_GRPCClient : NSObject
+@end
+@implementation PodsDummy_Pods_GRPCClient
+@end
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-GRPCClient/Pods-GRPCClient-prefix.pch b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-GRPCClient/Pods-GRPCClient-prefix.pch
new file mode 100644
index 0000000000..95cf11d9fb
--- /dev/null
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-GRPCClient/Pods-GRPCClient-prefix.pch
@@ -0,0 +1,5 @@
+#ifdef __OBJC__
+#import <UIKit/UIKit.h>
+#endif
+
+#import "Pods-environment.h"
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-GRPCClient/Pods-GRPCClient.xcconfig b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-GRPCClient/Pods-GRPCClient.xcconfig
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-GRPCClient/Pods-GRPCClient.xcconfig
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-RxLibrary/Pods-RxLibrary-Private.xcconfig b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-RxLibrary/Pods-RxLibrary-Private.xcconfig
index 5c1a7097be..a1c3897b81 100644
--- a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-RxLibrary/Pods-RxLibrary-Private.xcconfig
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-RxLibrary/Pods-RxLibrary-Private.xcconfig
@@ -1,5 +1,5 @@
 #include "Pods-RxLibrary.xcconfig"
 GCC_PREPROCESSOR_DEFINITIONS = $(inherited) COCOAPODS=1
-HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Build" "${PODS_ROOT}/Headers/Build/RxLibrary" "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/RxLibrary"
+HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Build" "${PODS_ROOT}/Headers/Build/RxLibrary" "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/GRPCClient" "${PODS_ROOT}/Headers/Public/RxLibrary"
 OTHER_LDFLAGS = -ObjC
 PODS_ROOT = ${SRCROOT}
\ No newline at end of file
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample-GRPCClient/Pods-Sample-GRPCClient-Private.xcconfig b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample-GRPCClient/Pods-Sample-GRPCClient-Private.xcconfig
new file mode 100644
index 0000000000..e23f7be66f
--- /dev/null
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample-GRPCClient/Pods-Sample-GRPCClient-Private.xcconfig
@@ -0,0 +1,5 @@
+#include "Pods-Sample-GRPCClient.xcconfig"
+GCC_PREPROCESSOR_DEFINITIONS = $(inherited) COCOAPODS=1
+HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Build" "${PODS_ROOT}/Headers/Build/GRPCClient" "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/GRPCClient" "${PODS_ROOT}/Headers/Public/RxLibrary"
+OTHER_LDFLAGS = -ObjC
+PODS_ROOT = ${SRCROOT}
\ No newline at end of file
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample-GRPCClient/Pods-Sample-GRPCClient-dummy.m b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample-GRPCClient/Pods-Sample-GRPCClient-dummy.m
new file mode 100644
index 0000000000..2bf2682a72
--- /dev/null
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample-GRPCClient/Pods-Sample-GRPCClient-dummy.m
@@ -0,0 +1,5 @@
+#import <Foundation/Foundation.h>
+@interface PodsDummy_Pods_Sample_GRPCClient : NSObject
+@end
+@implementation PodsDummy_Pods_Sample_GRPCClient
+@end
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample-GRPCClient/Pods-Sample-GRPCClient-prefix.pch b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample-GRPCClient/Pods-Sample-GRPCClient-prefix.pch
new file mode 100644
index 0000000000..0e807f67a3
--- /dev/null
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample-GRPCClient/Pods-Sample-GRPCClient-prefix.pch
@@ -0,0 +1,5 @@
+#ifdef __OBJC__
+#import <UIKit/UIKit.h>
+#endif
+
+#import "Pods-Sample-environment.h"
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample-GRPCClient/Pods-Sample-GRPCClient.xcconfig b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample-GRPCClient/Pods-Sample-GRPCClient.xcconfig
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample-GRPCClient/Pods-Sample-GRPCClient.xcconfig
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample-RxLibrary/Pods-Sample-RxLibrary-Private.xcconfig b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample-RxLibrary/Pods-Sample-RxLibrary-Private.xcconfig
index 2cc81f729d..023a22eb14 100644
--- a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample-RxLibrary/Pods-Sample-RxLibrary-Private.xcconfig
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample-RxLibrary/Pods-Sample-RxLibrary-Private.xcconfig
@@ -1,5 +1,5 @@
 #include "Pods-Sample-RxLibrary.xcconfig"
 GCC_PREPROCESSOR_DEFINITIONS = $(inherited) COCOAPODS=1
-HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Build" "${PODS_ROOT}/Headers/Build/RxLibrary" "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/RxLibrary"
+HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Build" "${PODS_ROOT}/Headers/Build/RxLibrary" "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/GRPCClient" "${PODS_ROOT}/Headers/Public/RxLibrary"
 OTHER_LDFLAGS = -ObjC
 PODS_ROOT = ${SRCROOT}
\ No newline at end of file
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample/Pods-Sample-environment.h b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample/Pods-Sample-environment.h
index b4fd16b369..d0acfc70ec 100644
--- a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample/Pods-Sample-environment.h
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample/Pods-Sample-environment.h
@@ -6,6 +6,12 @@
 // project.
 
 
+// GRPCClient
+#define COCOAPODS_POD_AVAILABLE_GRPCClient
+#define COCOAPODS_VERSION_MAJOR_GRPCClient 0
+#define COCOAPODS_VERSION_MINOR_GRPCClient 0
+#define COCOAPODS_VERSION_PATCH_GRPCClient 1
+
 // RxLibrary
 #define COCOAPODS_POD_AVAILABLE_RxLibrary
 #define COCOAPODS_VERSION_MAJOR_RxLibrary 0
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample/Pods-Sample.debug.xcconfig b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample/Pods-Sample.debug.xcconfig
index 776727154c..06aa64cfac 100644
--- a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample/Pods-Sample.debug.xcconfig
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample/Pods-Sample.debug.xcconfig
@@ -1,6 +1,6 @@
 GCC_PREPROCESSOR_DEFINITIONS = $(inherited) COCOAPODS=1
-HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/RxLibrary"
-OTHER_CFLAGS = $(inherited) -isystem "${PODS_ROOT}/Headers/Public" -isystem "${PODS_ROOT}/Headers/Public/RxLibrary"
-OTHER_LDFLAGS = -ObjC -l"Pods-Sample-RxLibrary"
+HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/GRPCClient" "${PODS_ROOT}/Headers/Public/RxLibrary"
+OTHER_CFLAGS = $(inherited) -isystem "${PODS_ROOT}/Headers/Public" -isystem "${PODS_ROOT}/Headers/Public/GRPCClient" -isystem "${PODS_ROOT}/Headers/Public/RxLibrary"
+OTHER_LDFLAGS = -ObjC -l"Pods-Sample-GRPCClient" -l"Pods-Sample-RxLibrary"
 OTHER_LIBTOOLFLAGS = $(OTHER_LDFLAGS)
 PODS_ROOT = ${SRCROOT}/Pods
\ No newline at end of file
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample/Pods-Sample.release.xcconfig b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample/Pods-Sample.release.xcconfig
index 776727154c..06aa64cfac 100644
--- a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample/Pods-Sample.release.xcconfig
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-Sample/Pods-Sample.release.xcconfig
@@ -1,6 +1,6 @@
 GCC_PREPROCESSOR_DEFINITIONS = $(inherited) COCOAPODS=1
-HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/RxLibrary"
-OTHER_CFLAGS = $(inherited) -isystem "${PODS_ROOT}/Headers/Public" -isystem "${PODS_ROOT}/Headers/Public/RxLibrary"
-OTHER_LDFLAGS = -ObjC -l"Pods-Sample-RxLibrary"
+HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/GRPCClient" "${PODS_ROOT}/Headers/Public/RxLibrary"
+OTHER_CFLAGS = $(inherited) -isystem "${PODS_ROOT}/Headers/Public" -isystem "${PODS_ROOT}/Headers/Public/GRPCClient" -isystem "${PODS_ROOT}/Headers/Public/RxLibrary"
+OTHER_LDFLAGS = -ObjC -l"Pods-Sample-GRPCClient" -l"Pods-Sample-RxLibrary"
 OTHER_LIBTOOLFLAGS = $(OTHER_LDFLAGS)
 PODS_ROOT = ${SRCROOT}/Pods
\ No newline at end of file
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests-GRPCClient/Pods-SampleTests-GRPCClient-Private.xcconfig b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests-GRPCClient/Pods-SampleTests-GRPCClient-Private.xcconfig
new file mode 100644
index 0000000000..01e25c4a88
--- /dev/null
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests-GRPCClient/Pods-SampleTests-GRPCClient-Private.xcconfig
@@ -0,0 +1,5 @@
+#include "Pods-SampleTests-GRPCClient.xcconfig"
+GCC_PREPROCESSOR_DEFINITIONS = $(inherited) COCOAPODS=1
+HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Build" "${PODS_ROOT}/Headers/Build/GRPCClient" "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/GRPCClient" "${PODS_ROOT}/Headers/Public/RxLibrary"
+OTHER_LDFLAGS = -ObjC
+PODS_ROOT = ${SRCROOT}
\ No newline at end of file
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests-GRPCClient/Pods-SampleTests-GRPCClient-dummy.m b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests-GRPCClient/Pods-SampleTests-GRPCClient-dummy.m
new file mode 100644
index 0000000000..7ecd57a34b
--- /dev/null
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests-GRPCClient/Pods-SampleTests-GRPCClient-dummy.m
@@ -0,0 +1,5 @@
+#import <Foundation/Foundation.h>
+@interface PodsDummy_Pods_SampleTests_GRPCClient : NSObject
+@end
+@implementation PodsDummy_Pods_SampleTests_GRPCClient
+@end
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests-GRPCClient/Pods-SampleTests-GRPCClient-prefix.pch b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests-GRPCClient/Pods-SampleTests-GRPCClient-prefix.pch
new file mode 100644
index 0000000000..abd5651587
--- /dev/null
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests-GRPCClient/Pods-SampleTests-GRPCClient-prefix.pch
@@ -0,0 +1,5 @@
+#ifdef __OBJC__
+#import <UIKit/UIKit.h>
+#endif
+
+#import "Pods-SampleTests-environment.h"
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests-GRPCClient/Pods-SampleTests-GRPCClient.xcconfig b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests-GRPCClient/Pods-SampleTests-GRPCClient.xcconfig
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests-GRPCClient/Pods-SampleTests-GRPCClient.xcconfig
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests-RxLibrary/Pods-SampleTests-RxLibrary-Private.xcconfig b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests-RxLibrary/Pods-SampleTests-RxLibrary-Private.xcconfig
index a3cd792434..67069bae5d 100644
--- a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests-RxLibrary/Pods-SampleTests-RxLibrary-Private.xcconfig
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests-RxLibrary/Pods-SampleTests-RxLibrary-Private.xcconfig
@@ -1,5 +1,5 @@
 #include "Pods-SampleTests-RxLibrary.xcconfig"
 GCC_PREPROCESSOR_DEFINITIONS = $(inherited) COCOAPODS=1
-HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Build" "${PODS_ROOT}/Headers/Build/RxLibrary" "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/RxLibrary"
+HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Build" "${PODS_ROOT}/Headers/Build/RxLibrary" "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/GRPCClient" "${PODS_ROOT}/Headers/Public/RxLibrary"
 OTHER_LDFLAGS = -ObjC
 PODS_ROOT = ${SRCROOT}
\ No newline at end of file
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests/Pods-SampleTests-environment.h b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests/Pods-SampleTests-environment.h
index b4fd16b369..d0acfc70ec 100644
--- a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests/Pods-SampleTests-environment.h
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests/Pods-SampleTests-environment.h
@@ -6,6 +6,12 @@
 // project.
 
 
+// GRPCClient
+#define COCOAPODS_POD_AVAILABLE_GRPCClient
+#define COCOAPODS_VERSION_MAJOR_GRPCClient 0
+#define COCOAPODS_VERSION_MINOR_GRPCClient 0
+#define COCOAPODS_VERSION_PATCH_GRPCClient 1
+
 // RxLibrary
 #define COCOAPODS_POD_AVAILABLE_RxLibrary
 #define COCOAPODS_VERSION_MAJOR_RxLibrary 0
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests/Pods-SampleTests.debug.xcconfig b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests/Pods-SampleTests.debug.xcconfig
index 92a3b7d2bd..892541c53e 100644
--- a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests/Pods-SampleTests.debug.xcconfig
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests/Pods-SampleTests.debug.xcconfig
@@ -1,6 +1,6 @@
 GCC_PREPROCESSOR_DEFINITIONS = $(inherited) COCOAPODS=1
-HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/RxLibrary"
-OTHER_CFLAGS = $(inherited) -isystem "${PODS_ROOT}/Headers/Public" -isystem "${PODS_ROOT}/Headers/Public/RxLibrary"
-OTHER_LDFLAGS = -ObjC -l"Pods-SampleTests-RxLibrary"
+HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/GRPCClient" "${PODS_ROOT}/Headers/Public/RxLibrary"
+OTHER_CFLAGS = $(inherited) -isystem "${PODS_ROOT}/Headers/Public" -isystem "${PODS_ROOT}/Headers/Public/GRPCClient" -isystem "${PODS_ROOT}/Headers/Public/RxLibrary"
+OTHER_LDFLAGS = -ObjC -l"Pods-SampleTests-GRPCClient" -l"Pods-SampleTests-RxLibrary"
 OTHER_LIBTOOLFLAGS = $(OTHER_LDFLAGS)
 PODS_ROOT = ${SRCROOT}/Pods
\ No newline at end of file
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests/Pods-SampleTests.release.xcconfig b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests/Pods-SampleTests.release.xcconfig
index 92a3b7d2bd..892541c53e 100644
--- a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests/Pods-SampleTests.release.xcconfig
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods-SampleTests/Pods-SampleTests.release.xcconfig
@@ -1,6 +1,6 @@
 GCC_PREPROCESSOR_DEFINITIONS = $(inherited) COCOAPODS=1
-HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/RxLibrary"
-OTHER_CFLAGS = $(inherited) -isystem "${PODS_ROOT}/Headers/Public" -isystem "${PODS_ROOT}/Headers/Public/RxLibrary"
-OTHER_LDFLAGS = -ObjC -l"Pods-SampleTests-RxLibrary"
+HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/GRPCClient" "${PODS_ROOT}/Headers/Public/RxLibrary"
+OTHER_CFLAGS = $(inherited) -isystem "${PODS_ROOT}/Headers/Public" -isystem "${PODS_ROOT}/Headers/Public/GRPCClient" -isystem "${PODS_ROOT}/Headers/Public/RxLibrary"
+OTHER_LDFLAGS = -ObjC -l"Pods-SampleTests-GRPCClient" -l"Pods-SampleTests-RxLibrary"
 OTHER_LIBTOOLFLAGS = $(OTHER_LDFLAGS)
 PODS_ROOT = ${SRCROOT}/Pods
\ No newline at end of file
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods/Pods-environment.h b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods/Pods-environment.h
index b4fd16b369..d0acfc70ec 100644
--- a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods/Pods-environment.h
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods/Pods-environment.h
@@ -6,6 +6,12 @@
 // project.
 
 
+// GRPCClient
+#define COCOAPODS_POD_AVAILABLE_GRPCClient
+#define COCOAPODS_VERSION_MAJOR_GRPCClient 0
+#define COCOAPODS_VERSION_MINOR_GRPCClient 0
+#define COCOAPODS_VERSION_PATCH_GRPCClient 1
+
 // RxLibrary
 #define COCOAPODS_POD_AVAILABLE_RxLibrary
 #define COCOAPODS_VERSION_MAJOR_RxLibrary 0
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods/Pods.debug.xcconfig b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods/Pods.debug.xcconfig
index 3c7fe4aa00..e9fafccb07 100644
--- a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods/Pods.debug.xcconfig
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods/Pods.debug.xcconfig
@@ -1,6 +1,6 @@
 GCC_PREPROCESSOR_DEFINITIONS = $(inherited) COCOAPODS=1
-HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/RxLibrary"
-OTHER_CFLAGS = $(inherited) -isystem "${PODS_ROOT}/Headers/Public" -isystem "${PODS_ROOT}/Headers/Public/RxLibrary"
-OTHER_LDFLAGS = -ObjC -l"Pods-RxLibrary"
+HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/GRPCClient" "${PODS_ROOT}/Headers/Public/RxLibrary"
+OTHER_CFLAGS = $(inherited) -isystem "${PODS_ROOT}/Headers/Public" -isystem "${PODS_ROOT}/Headers/Public/GRPCClient" -isystem "${PODS_ROOT}/Headers/Public/RxLibrary"
+OTHER_LDFLAGS = -ObjC -l"Pods-GRPCClient" -l"Pods-RxLibrary"
 OTHER_LIBTOOLFLAGS = $(OTHER_LDFLAGS)
 PODS_ROOT = ${SRCROOT}/Pods
\ No newline at end of file
diff --git a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods/Pods.release.xcconfig b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods/Pods.release.xcconfig
index 3c7fe4aa00..e9fafccb07 100644
--- a/src/objective-c/examples/Sample/Pods/Target Support Files/Pods/Pods.release.xcconfig
+++ b/src/objective-c/examples/Sample/Pods/Target Support Files/Pods/Pods.release.xcconfig
@@ -1,6 +1,6 @@
 GCC_PREPROCESSOR_DEFINITIONS = $(inherited) COCOAPODS=1
-HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/RxLibrary"
-OTHER_CFLAGS = $(inherited) -isystem "${PODS_ROOT}/Headers/Public" -isystem "${PODS_ROOT}/Headers/Public/RxLibrary"
-OTHER_LDFLAGS = -ObjC -l"Pods-RxLibrary"
+HEADER_SEARCH_PATHS = "${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/GRPCClient" "${PODS_ROOT}/Headers/Public/RxLibrary"
+OTHER_CFLAGS = $(inherited) -isystem "${PODS_ROOT}/Headers/Public" -isystem "${PODS_ROOT}/Headers/Public/GRPCClient" -isystem "${PODS_ROOT}/Headers/Public/RxLibrary"
+OTHER_LDFLAGS = -ObjC -l"Pods-GRPCClient" -l"Pods-RxLibrary"
 OTHER_LIBTOOLFLAGS = $(OTHER_LDFLAGS)
 PODS_ROOT = ${SRCROOT}/Pods
\ No newline at end of file
diff --git a/src/objective-c/examples/Sample/Sample/ViewController.m b/src/objective-c/examples/Sample/Sample/ViewController.m
index 70b5d45811..f24d81888b 100644
--- a/src/objective-c/examples/Sample/Sample/ViewController.m
+++ b/src/objective-c/examples/Sample/Sample/ViewController.m
@@ -32,6 +32,10 @@
  */
 
 #import "ViewController.h"
+#import <GRPCClient/GRPCCall.h>
+#import <GRPCClient/GRPCMethodName.h>
+#import <RxLibrary/GRXWriter+Immediate.h>
+#import <RxLibrary/GRXWriteable.h>
 
 @interface ViewController ()
 
@@ -42,6 +46,20 @@
 - (void)viewDidLoad {
   [super viewDidLoad];
   // Do any additional setup after loading the view, typically from a nib.
+
+  GRPCMethodName *method = [[GRPCMethodName alloc] initWithPackage:@"grpc.testing"
+                                                         interface:@"TestService"
+                                                            method:@"EmptyCall"];
+
+  GRPCCall *call = [[GRPCCall alloc] initWithHost:@"localhost"
+                                           method:method
+                                   requestsWriter:[GRXWriter writerWithValue:[NSData data]]];
+
+  [call startWithWriteable:[[GRXWriteable alloc] initWithValueHandler:^(NSData *value) {
+    NSLog(@"Received response: %@", value);
+  } completionHandler:^(NSError *errorOrNil) {
+    NSLog(@"Finished with error: %@", errorOrNil);
+  }]];
 }
 
 - (void)didReceiveMemoryWarning {
diff --git a/src/python/src/grpc/framework/assembly/implementations.py b/src/python/src/grpc/framework/assembly/implementations.py
index 461aa9c855..b9d314844c 100644
--- a/src/python/src/grpc/framework/assembly/implementations.py
+++ b/src/python/src/grpc/framework/assembly/implementations.py
@@ -195,7 +195,7 @@ def _servicer(implementations, pool):
       event_stream_in_stream_out_methods=event_stream_in_stream_out_methods)
 
 
-class _ServiceAssembly(activated.Activated):
+class _ServiceAssembly(interfaces.Server):
 
   def __init__(self, implementations, fore_link):
     self._implementations = implementations
@@ -237,6 +237,10 @@ class _ServiceAssembly(activated.Activated):
   def stop(self):
     self._stop()
 
+  def port(self):
+    with self._lock:
+      return self._fore_link.port()
+
 
 def assemble_face_stub(activated_rear_link):
   """Assembles a face_interfaces.Stub.
@@ -300,6 +304,6 @@ def assemble_service(implementations, activated_fore_link):
       when passed to this method.
 
   Returns:
-    An activated.Activated value encapsulating RPC service.
+    An interfaces.Server encapsulating RPC service.
   """
   return _ServiceAssembly(implementations, activated_fore_link)
diff --git a/src/python/src/grpc/framework/assembly/interfaces.py b/src/python/src/grpc/framework/assembly/interfaces.py
index e5d750b2bc..d1a6aad29e 100644
--- a/src/python/src/grpc/framework/assembly/interfaces.py
+++ b/src/python/src/grpc/framework/assembly/interfaces.py
@@ -37,6 +37,7 @@ import abc
 # module.
 from grpc.framework.common import cardinality  # pylint: disable=unused-import
 from grpc.framework.common import style  # pylint: disable=unused-import
+from grpc.framework.foundation import activated
 from grpc.framework.foundation import stream  # pylint: disable=unused-import
 
 
@@ -89,3 +90,25 @@ class MethodImplementation(object):
       style.Service.EVENT.
   """
   __metaclass__ = abc.ABCMeta
+
+
+class Server(activated.Activated):
+  """The server interface.
+
+  Aside from being able to be activated and deactivated, objects of this type
+  are able to report the port on which they are servicing RPCs.
+  """
+  __metaclass__ = abc.ABCMeta
+
+  # TODO(issue 726): This is an abstraction violation; not every Server is
+  # necessarily serving over a network at all.
+  @abc.abstractmethod
+  def port(self):
+    """Identifies the port on which this Server is servicing RPCs.
+
+    This method may only be called while the server is active.
+
+    Returns:
+      The number of the port on which this Server is servicing RPCs.
+    """
+    raise NotImplementedError()
diff --git a/src/ruby/bin/interop/interop_client.rb b/src/ruby/bin/interop/interop_client.rb
index 50a14e3a96..76402b7c89 100755
--- a/src/ruby/bin/interop/interop_client.rb
+++ b/src/ruby/bin/interop/interop_client.rb
@@ -56,7 +56,7 @@ require 'test/cpp/interop/empty'
 
 require 'signet/ssl_config'
 
-include Google::RPC::Auth
+include GRPC::Auth
 
 # loads the certificates used to access the test server securely.
 def load_test_certs