Merge pull request #16649 from ncteisen/channelz

Channelz Part 6: Basic Socket Support

13 files changed, 212 insertions, 10 deletions

diff --git a/grpc.def b/grpc.def
index b7ba2c5d10..345c0a786c 100644
--- a/grpc.def
+++ b/grpc.def
@@ -77,6 +77,7 @@ EXPORTS
     grpc_channelz_get_servers
     grpc_channelz_get_channel
     grpc_channelz_get_subchannel
+    grpc_channelz_get_socket
     grpc_insecure_channel_create_from_fd
     grpc_server_add_insecure_channel_from_fd
     grpc_use_signal
diff --git a/include/grpc/grpc.h b/include/grpc/grpc.h
index 787d6ae6d7..a9beee1c9e 100644
--- a/include/grpc/grpc.h
+++ b/include/grpc/grpc.h
@@ -511,6 +511,10 @@ GRPCAPI char* grpc_channelz_get_channel(intptr_t channel_id);
    is allocated and must be freed by the application. */
 GRPCAPI char* grpc_channelz_get_subchannel(intptr_t subchannel_id);
 
+/* Returns a single Socket, or else a NOT_FOUND code. The returned string
+   is allocated and must be freed by the application. */
+GRPCAPI char* grpc_channelz_get_socket(intptr_t socket_id);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/core/ext/transport/chttp2/transport/chttp2_transport.cc b/src/core/ext/transport/chttp2/transport/chttp2_transport.cc
index 26cad2cc9a..d3232f4d26 100644
--- a/src/core/ext/transport/chttp2/transport/chttp2_transport.cc
+++ b/src/core/ext/transport/chttp2/transport/chttp2_transport.cc
@@ -157,6 +157,10 @@ bool g_flow_control_enabled = true;
 static void destruct_transport(grpc_chttp2_transport* t) {
   size_t i;
 
+  if (t->channelz_socket != nullptr) {
+    t->channelz_socket.reset();
+  }
+
   grpc_endpoint_destroy(t->ep);
 
   grpc_slice_buffer_destroy_internal(&t->qbuf);
@@ -335,6 +339,10 @@ static bool read_channel_args(grpc_chttp2_transport* t,
                 GRPC_ARG_OPTIMIZATION_TARGET,
                 channel_args->args[i].value.string);
       }
+    } else if (0 ==
+               strcmp(channel_args->args[i].key, GRPC_ARG_ENABLE_CHANNELZ)) {
+      t->channelz_socket =
+          grpc_core::MakeRefCounted<grpc_core::channelz::SocketNode>();
     } else {
       static const struct {
         const char* channel_arg_name;
@@ -720,6 +728,14 @@ static void destroy_stream_locked(void* sp, grpc_error* error) {
   grpc_chttp2_stream* s = static_cast<grpc_chttp2_stream*>(sp);
   grpc_chttp2_transport* t = s->t;
 
+  if (t->channelz_socket != nullptr) {
+    if ((t->is_client && s->eos_received) || (!t->is_client && s->eos_sent)) {
+      t->channelz_socket->RecordStreamSucceeded();
+    } else {
+      t->channelz_socket->RecordStreamFailed();
+    }
+  }
+
   GPR_ASSERT((s->write_closed && s->read_closed) || s->id == 0);
   if (s->id != 0) {
     GPR_ASSERT(grpc_chttp2_stream_map_find(&t->stream_map, s->id) == nullptr);
@@ -1407,6 +1423,9 @@ static void perform_stream_op_locked(void* stream_op,
   }
 
   if (op->send_initial_metadata) {
+    if (t->is_client && t->channelz_socket != nullptr) {
+      t->channelz_socket->RecordStreamStartedFromLocal();
+    }
     GRPC_STATS_INC_HTTP2_OP_SEND_INITIAL_METADATA();
     GPR_ASSERT(s->send_initial_metadata_finished == nullptr);
     on_complete->next_data.scratch |= CLOSURE_BARRIER_MAY_COVER_WRITE;
@@ -1492,6 +1511,7 @@ static void perform_stream_op_locked(void* stream_op,
 
   if (op->send_message) {
     GRPC_STATS_INC_HTTP2_OP_SEND_MESSAGE();
+    t->num_messages_in_next_write++;
     GRPC_STATS_INC_HTTP2_SEND_MESSAGE_SIZE(
         op->payload->send_message.send_message->length());
     on_complete->next_data.scratch |= CLOSURE_BARRIER_MAY_COVER_WRITE;
@@ -2707,6 +2727,9 @@ static void start_keepalive_ping_locked(void* arg, grpc_error* error) {
   if (error != GRPC_ERROR_NONE) {
     return;
   }
+  if (t->channelz_socket != nullptr) {
+    t->channelz_socket->RecordKeepaliveSent();
+  }
   GRPC_CHTTP2_REF_TRANSPORT(t, "keepalive watchdog");
   grpc_timer_init(&t->keepalive_watchdog_timer,
                   grpc_core::ExecCtx::Get()->Now() + t->keepalive_timeout,
diff --git a/src/core/ext/transport/chttp2/transport/frame_data.cc b/src/core/ext/transport/chttp2/transport/frame_data.cc
index f8f06f6789..933b32c03c 100644
--- a/src/core/ext/transport/chttp2/transport/frame_data.cc
+++ b/src/core/ext/transport/chttp2/transport/frame_data.cc
@@ -62,6 +62,7 @@ grpc_error* grpc_chttp2_data_parser_begin_frame(grpc_chttp2_data_parser* parser,
 
   if (flags & GRPC_CHTTP2_DATA_FLAG_END_STREAM) {
     s->received_last_frame = true;
+    s->eos_received = true;
   } else {
     s->received_last_frame = false;
   }
@@ -191,6 +192,9 @@ grpc_error* grpc_deframe_unprocessed_incoming_frames(
         GPR_ASSERT(stream_out != nullptr);
         GPR_ASSERT(p->parsing_frame == nullptr);
         p->frame_size |= (static_cast<uint32_t>(*cur));
+        if (t->channelz_socket != nullptr) {
+          t->channelz_socket->RecordMessageReceived();
+        }
         p->state = GRPC_CHTTP2_DATA_FRAME;
         ++cur;
         message_flags = 0;
diff --git a/src/core/ext/transport/chttp2/transport/internal.h b/src/core/ext/transport/chttp2/transport/internal.h
index 6b5309bab4..ff26dd9255 100644
--- a/src/core/ext/transport/chttp2/transport/internal.h
+++ b/src/core/ext/transport/chttp2/transport/internal.h
@@ -36,6 +36,7 @@
 #include "src/core/ext/transport/chttp2/transport/hpack_parser.h"
 #include "src/core/ext/transport/chttp2/transport/incoming_metadata.h"
 #include "src/core/ext/transport/chttp2/transport/stream_map.h"
+#include "src/core/lib/channel/channelz.h"
 #include "src/core/lib/compression/stream_compression.h"
 #include "src/core/lib/gprpp/manual_constructor.h"
 #include "src/core/lib/iomgr/combiner.h"
@@ -471,6 +472,9 @@ struct grpc_chttp2_transport {
   bool keepalive_permit_without_calls;
   /** keep-alive state machine state */
   grpc_chttp2_keepalive_state keepalive_state;
+
+  grpc_core::RefCountedPtr<grpc_core::channelz::SocketNode> channelz_socket;
+  uint32_t num_messages_in_next_write;
 };
 
 typedef enum {
@@ -534,6 +538,10 @@ struct grpc_chttp2_stream {
   /** Has trailing metadata been received. */
   bool received_trailing_metadata;
 
+  /* have we sent or received the EOS bit? */
+  bool eos_received;
+  bool eos_sent;
+
   /** the error that resulted in this stream being read-closed */
   grpc_error* read_closed_error;
   /** the error that resulted in this stream being write-closed */
diff --git a/src/core/ext/transport/chttp2/transport/parsing.cc b/src/core/ext/transport/chttp2/transport/parsing.cc
index 8e9aa613a6..f532b084c9 100644
--- a/src/core/ext/transport/chttp2/transport/parsing.cc
+++ b/src/core/ext/transport/chttp2/transport/parsing.cc
@@ -623,6 +623,9 @@ static grpc_error* init_header_frame_parser(grpc_chttp2_transport* t,
           gpr_log(GPR_ERROR, "grpc_chttp2_stream not accepted"));
       return init_skip_frame_parser(t, 1);
     }
+    if (t->channelz_socket != nullptr) {
+      t->channelz_socket->RecordStreamStartedFromRemote();
+    }
   } else {
     t->incoming_stream = s;
   }
@@ -636,6 +639,9 @@ static grpc_error* init_header_frame_parser(grpc_chttp2_transport* t,
   }
   t->parser = grpc_chttp2_header_parser_parse;
   t->parser_data = &t->hpack_parser;
+  if (t->header_eof) {
+    s->eos_received = true;
+  }
   switch (s->header_frames_received) {
     case 0:
       if (t->is_client && t->header_eof) {
diff --git a/src/core/ext/transport/chttp2/transport/writing.cc b/src/core/ext/transport/chttp2/transport/writing.cc
index 8b73b01dea..d533989444 100644
--- a/src/core/ext/transport/chttp2/transport/writing.cc
+++ b/src/core/ext/transport/chttp2/transport/writing.cc
@@ -569,6 +569,7 @@ class StreamWriteContext {
   void SentLastFrame() {
     s_->send_trailing_metadata = nullptr;
     s_->sent_trailing_metadata = true;
+    s_->eos_sent = true;
 
     if (!t_->is_client && !s_->read_closed) {
       grpc_slice_buffer_add(
@@ -632,6 +633,11 @@ void grpc_chttp2_end_write(grpc_chttp2_transport* t, grpc_error* error) {
   GPR_TIMER_SCOPE("grpc_chttp2_end_write", 0);
   grpc_chttp2_stream* s;
 
+  if (t->channelz_socket != nullptr) {
+    t->channelz_socket->RecordMessagesSent(t->num_messages_in_next_write);
+  }
+  t->num_messages_in_next_write = 0;
+
   while (grpc_chttp2_list_pop_writing_stream(t, &s)) {
     if (s->sending_bytes != 0) {
       update_list(t, s, static_cast<int64_t>(s->sending_bytes),
diff --git a/src/core/lib/channel/channelz.cc b/src/core/lib/channel/channelz.cc
index 375cf25cc6..339c827525 100644
--- a/src/core/lib/channel/channelz.cc
+++ b/src/core/lib/channel/channelz.cc
@@ -62,7 +62,7 @@ CallCountingHelper::CallCountingHelper() {
 CallCountingHelper::~CallCountingHelper() {}
 
 void CallCountingHelper::RecordCallStarted() {
-  gpr_atm_no_barrier_fetch_add(&calls_started_, (gpr_atm)1);
+  gpr_atm_no_barrier_fetch_add(&calls_started_, static_cast<gpr_atm>(1));
   gpr_atm_no_barrier_store(&last_call_started_millis_,
                            (gpr_atm)ExecCtx::Get()->Now());
 }
@@ -81,11 +81,13 @@ void CallCountingHelper::PopulateCallCounts(grpc_json* json) {
     json_iterator = grpc_json_add_number_string_child(
         json, json_iterator, "callsFailed", calls_failed_);
   }
-  gpr_timespec ts =
-      grpc_millis_to_timespec(last_call_started_millis_, GPR_CLOCK_REALTIME);
-  json_iterator =
-      grpc_json_create_child(json_iterator, json, "lastCallStartedTimestamp",
-                             gpr_format_timespec(ts), GRPC_JSON_STRING, true);
+  if (calls_started_ != 0) {
+    gpr_timespec ts =
+        grpc_millis_to_timespec(last_call_started_millis_, GPR_CLOCK_REALTIME);
+    json_iterator =
+        grpc_json_create_child(json_iterator, json, "lastCallStartedTimestamp",
+                               gpr_format_timespec(ts), GRPC_JSON_STRING, true);
+  }
 }
 
 ChannelNode::ChannelNode(grpc_channel* channel, size_t channel_tracer_max_nodes,
@@ -180,7 +182,103 @@ grpc_json* ServerNode::RenderJson() {
   }
   // ask CallCountingHelper to populate trace and call count data.
   call_counter_.PopulateCallCounts(json);
+  return top_level_json;
+}
+
+SocketNode::SocketNode() : BaseNode(EntityType::kSocket) {}
+
+void SocketNode::RecordStreamStartedFromLocal() {
+  gpr_atm_no_barrier_fetch_add(&streams_started_, static_cast<gpr_atm>(1));
+  gpr_atm_no_barrier_store(&last_local_stream_created_millis_,
+                           (gpr_atm)ExecCtx::Get()->Now());
+}
+
+void SocketNode::RecordStreamStartedFromRemote() {
+  gpr_atm_no_barrier_fetch_add(&streams_started_, static_cast<gpr_atm>(1));
+  gpr_atm_no_barrier_store(&last_remote_stream_created_millis_,
+                           (gpr_atm)ExecCtx::Get()->Now());
+}
+
+void SocketNode::RecordMessagesSent(uint32_t num_sent) {
+  gpr_atm_no_barrier_fetch_add(&messages_sent_, static_cast<gpr_atm>(num_sent));
+  gpr_atm_no_barrier_store(&last_message_sent_millis_,
+                           (gpr_atm)ExecCtx::Get()->Now());
+}
+
+void SocketNode::RecordMessageReceived() {
+  gpr_atm_no_barrier_fetch_add(&messages_received_, static_cast<gpr_atm>(1));
+  gpr_atm_no_barrier_store(&last_message_received_millis_,
+                           (gpr_atm)ExecCtx::Get()->Now());
+}
+
+grpc_json* SocketNode::RenderJson() {
+  // We need to track these three json objects to build our object
+  grpc_json* top_level_json = grpc_json_create(GRPC_JSON_OBJECT);
+  grpc_json* json = top_level_json;
+  grpc_json* json_iterator = nullptr;
+  // create and fill the ref child
+  json_iterator = grpc_json_create_child(json_iterator, json, "ref", nullptr,
+                                         GRPC_JSON_OBJECT, false);
+  json = json_iterator;
+  json_iterator = nullptr;
+  json_iterator = grpc_json_add_number_string_child(json, json_iterator,
+                                                    "socketId", uuid());
+  // reset json iterators to top level object
   json = top_level_json;
+  json_iterator = nullptr;
+  // create and fill the data child.
+  grpc_json* data = grpc_json_create_child(json_iterator, json, "data", nullptr,
+                                           GRPC_JSON_OBJECT, false);
+  json = data;
+  json_iterator = nullptr;
+  gpr_timespec ts;
+  if (streams_started_ != 0) {
+    json_iterator = grpc_json_add_number_string_child(
+        json, json_iterator, "streamsStarted", streams_started_);
+    if (last_local_stream_created_millis_ != 0) {
+      ts = grpc_millis_to_timespec(last_local_stream_created_millis_,
+                                   GPR_CLOCK_REALTIME);
+      json_iterator = grpc_json_create_child(
+          json_iterator, json, "lastLocalStreamCreatedTimestamp",
+          gpr_format_timespec(ts), GRPC_JSON_STRING, true);
+    }
+    if (last_remote_stream_created_millis_ != 0) {
+      ts = grpc_millis_to_timespec(last_remote_stream_created_millis_,
+                                   GPR_CLOCK_REALTIME);
+      json_iterator = grpc_json_create_child(
+          json_iterator, json, "lastRemoteStreamCreatedTimestamp",
+          gpr_format_timespec(ts), GRPC_JSON_STRING, true);
+    }
+  }
+  if (streams_succeeded_ != 0) {
+    json_iterator = grpc_json_add_number_string_child(
+        json, json_iterator, "streamsSucceeded", streams_succeeded_);
+  }
+  if (streams_failed_) {
+    json_iterator = grpc_json_add_number_string_child(
+        json, json_iterator, "streamsFailed", streams_failed_);
+  }
+  if (messages_sent_ != 0) {
+    json_iterator = grpc_json_add_number_string_child(
+        json, json_iterator, "messagesSent", messages_sent_);
+    ts = grpc_millis_to_timespec(last_message_sent_millis_, GPR_CLOCK_REALTIME);
+    json_iterator =
+        grpc_json_create_child(json_iterator, json, "lastMessageSentTimestamp",
+                               gpr_format_timespec(ts), GRPC_JSON_STRING, true);
+  }
+  if (messages_received_ != 0) {
+    json_iterator = grpc_json_add_number_string_child(
+        json, json_iterator, "messagesReceived", messages_received_);
+    ts = grpc_millis_to_timespec(last_message_received_millis_,
+                                 GPR_CLOCK_REALTIME);
+    json_iterator = grpc_json_create_child(
+        json_iterator, json, "lastMessageReceivedTimestamp",
+        gpr_format_timespec(ts), GRPC_JSON_STRING, true);
+  }
+  if (keepalives_sent_ != 0) {
+    json_iterator = grpc_json_add_number_string_child(
+        json, json_iterator, "keepAlivesSent", keepalives_sent_);
+  }
   return top_level_json;
 }
 
diff --git a/src/core/lib/channel/channelz.h b/src/core/lib/channel/channelz.h
index 9be256147b..b7ae101238 100644
--- a/src/core/lib/channel/channelz.h
+++ b/src/core/lib/channel/channelz.h
@@ -92,10 +92,10 @@ class CallCountingHelper {
 
   void RecordCallStarted();
   void RecordCallFailed() {
-    gpr_atm_no_barrier_fetch_add(&calls_failed_, (gpr_atm(1)));
+    gpr_atm_no_barrier_fetch_add(&calls_failed_, static_cast<gpr_atm>(1));
   }
   void RecordCallSucceeded() {
-    gpr_atm_no_barrier_fetch_add(&calls_succeeded_, (gpr_atm(1)));
+    gpr_atm_no_barrier_fetch_add(&calls_succeeded_, static_cast<gpr_atm>(1));
   }
 
   // Common rendering of the call count data and last_call_started_timestamp.
@@ -197,11 +197,39 @@ class ServerNode : public BaseNode {
 };
 
 // Handles channelz bookkeeping for sockets
-// TODO(ncteisen): implement in subsequent PR.
 class SocketNode : public BaseNode {
  public:
-  SocketNode() : BaseNode(EntityType::kSocket) {}
+  SocketNode();
   ~SocketNode() override {}
+
+  grpc_json* RenderJson() override;
+
+  void RecordStreamStartedFromLocal();
+  void RecordStreamStartedFromRemote();
+  void RecordStreamSucceeded() {
+    gpr_atm_no_barrier_fetch_add(&streams_succeeded_, static_cast<gpr_atm>(1));
+  }
+  void RecordStreamFailed() {
+    gpr_atm_no_barrier_fetch_add(&streams_failed_, static_cast<gpr_atm>(1));
+  }
+  void RecordMessagesSent(uint32_t num_sent);
+  void RecordMessageReceived();
+  void RecordKeepaliveSent() {
+    gpr_atm_no_barrier_fetch_add(&keepalives_sent_, static_cast<gpr_atm>(1));
+  }
+
+ private:
+  gpr_atm streams_started_ = 0;
+  gpr_atm streams_succeeded_ = 0;
+  gpr_atm streams_failed_ = 0;
+  gpr_atm messages_sent_ = 0;
+  gpr_atm messages_received_ = 0;
+  gpr_atm keepalives_sent_ = 0;
+  gpr_atm last_local_stream_created_millis_ = 0;
+  gpr_atm last_remote_stream_created_millis_ = 0;
+  gpr_atm last_message_sent_millis_ = 0;
+  gpr_atm last_message_received_millis_ = 0;
+  UniquePtr<char> peer_string_;
 };
 
 // Creation functions
diff --git a/src/core/lib/channel/channelz_registry.cc b/src/core/lib/channel/channelz_registry.cc
index adc7b6ba44..841f1c6104 100644
--- a/src/core/lib/channel/channelz_registry.cc
+++ b/src/core/lib/channel/channelz_registry.cc
@@ -197,3 +197,21 @@ char* grpc_channelz_get_subchannel(intptr_t subchannel_id) {
   grpc_json_destroy(top_level_json);
   return json_str;
 }
+
+char* grpc_channelz_get_socket(intptr_t socket_id) {
+  grpc_core::channelz::BaseNode* socket_node =
+      grpc_core::channelz::ChannelzRegistry::Get(socket_id);
+  if (socket_node == nullptr ||
+      socket_node->type() !=
+          grpc_core::channelz::BaseNode::EntityType::kSocket) {
+    return nullptr;
+  }
+  grpc_json* top_level_json = grpc_json_create(GRPC_JSON_OBJECT);
+  grpc_json* json = top_level_json;
+  grpc_json* socket_json = socket_node->RenderJson();
+  socket_json->key = "socket";
+  grpc_json_link_child(json, socket_json, nullptr);
+  char* json_str = grpc_json_dump_to_string(top_level_json, 0);
+  grpc_json_destroy(top_level_json);
+  return json_str;
+}
diff --git a/src/ruby/ext/grpc/rb_grpc_imports.generated.c b/src/ruby/ext/grpc/rb_grpc_imports.generated.c
index 0c46f6c85a..1e7d7f687f 100644
--- a/src/ruby/ext/grpc/rb_grpc_imports.generated.c
+++ b/src/ruby/ext/grpc/rb_grpc_imports.generated.c
@@ -100,6 +100,7 @@ grpc_channelz_get_top_channels_type grpc_channelz_get_top_channels_import;
 grpc_channelz_get_servers_type grpc_channelz_get_servers_import;
 grpc_channelz_get_channel_type grpc_channelz_get_channel_import;
 grpc_channelz_get_subchannel_type grpc_channelz_get_subchannel_import;
+grpc_channelz_get_socket_type grpc_channelz_get_socket_import;
 grpc_insecure_channel_create_from_fd_type grpc_insecure_channel_create_from_fd_import;
 grpc_server_add_insecure_channel_from_fd_type grpc_server_add_insecure_channel_from_fd_import;
 grpc_use_signal_type grpc_use_signal_import;
@@ -356,6 +357,7 @@ void grpc_rb_load_imports(HMODULE library) {
   grpc_channelz_get_servers_import = (grpc_channelz_get_servers_type) GetProcAddress(library, "grpc_channelz_get_servers");
   grpc_channelz_get_channel_import = (grpc_channelz_get_channel_type) GetProcAddress(library, "grpc_channelz_get_channel");
   grpc_channelz_get_subchannel_import = (grpc_channelz_get_subchannel_type) GetProcAddress(library, "grpc_channelz_get_subchannel");
+  grpc_channelz_get_socket_import = (grpc_channelz_get_socket_type) GetProcAddress(library, "grpc_channelz_get_socket");
   grpc_insecure_channel_create_from_fd_import = (grpc_insecure_channel_create_from_fd_type) GetProcAddress(library, "grpc_insecure_channel_create_from_fd");
   grpc_server_add_insecure_channel_from_fd_import = (grpc_server_add_insecure_channel_from_fd_type) GetProcAddress(library, "grpc_server_add_insecure_channel_from_fd");
   grpc_use_signal_import = (grpc_use_signal_type) GetProcAddress(library, "grpc_use_signal");
diff --git a/src/ruby/ext/grpc/rb_grpc_imports.generated.h b/src/ruby/ext/grpc/rb_grpc_imports.generated.h
index 8ea5807e4f..ed4b6264b0 100644
--- a/src/ruby/ext/grpc/rb_grpc_imports.generated.h
+++ b/src/ruby/ext/grpc/rb_grpc_imports.generated.h
@@ -275,6 +275,9 @@ extern grpc_channelz_get_channel_type grpc_channelz_get_channel_import;
 typedef char*(*grpc_channelz_get_subchannel_type)(intptr_t subchannel_id);
 extern grpc_channelz_get_subchannel_type grpc_channelz_get_subchannel_import;
 #define grpc_channelz_get_subchannel grpc_channelz_get_subchannel_import
+typedef char*(*grpc_channelz_get_socket_type)(intptr_t socket_id);
+extern grpc_channelz_get_socket_type grpc_channelz_get_socket_import;
+#define grpc_channelz_get_socket grpc_channelz_get_socket_import
 typedef grpc_channel*(*grpc_insecure_channel_create_from_fd_type)(const char* target, int fd, const grpc_channel_args* args);
 extern grpc_insecure_channel_create_from_fd_type grpc_insecure_channel_create_from_fd_import;
 #define grpc_insecure_channel_create_from_fd grpc_insecure_channel_create_from_fd_import
diff --git a/test/core/surface/public_headers_must_be_c89.c b/test/core/surface/public_headers_must_be_c89.c
index b0af788796..3ebdb88a08 100644
--- a/test/core/surface/public_headers_must_be_c89.c
+++ b/test/core/surface/public_headers_must_be_c89.c
@@ -139,6 +139,7 @@ int main(int argc, char **argv) {
   printf("%lx", (unsigned long) grpc_channelz_get_servers);
   printf("%lx", (unsigned long) grpc_channelz_get_channel);
   printf("%lx", (unsigned long) grpc_channelz_get_subchannel);
+  printf("%lx", (unsigned long) grpc_channelz_get_socket);
   printf("%lx", (unsigned long) grpc_auth_property_iterator_next);
   printf("%lx", (unsigned long) grpc_auth_context_property_iterator);
   printf("%lx", (unsigned long) grpc_auth_context_peer_identity);