Merge remote-tracking branch 'upstream/master' into filter_call_init_failure

10 files changed, 374 insertions, 85 deletions

diff --git a/test/core/end2end/bad_server_response_test.c b/test/core/end2end/bad_server_response_test.c
index cca75f54a5..ab80adf0e0 100644
--- a/test/core/end2end/bad_server_response_test.c
+++ b/test/core/end2end/bad_server_response_test.c
@@ -71,6 +71,8 @@
 
 #define UNPARSEABLE_DETAIL_MSG "Failed parsing HTTP/2"
 
+#define HTTP1_DETAIL_MSG "Trying to connect an http1.x server"
+
 /* TODO(zyc) Check the content of incomming data instead of using this length */
 #define EXPECTED_INCOMING_DATA_LENGTH (size_t)310
 
@@ -334,7 +336,7 @@ int main(int argc, char **argv) {
 
   /* http1 response */
   run_test(HTTP1_RESP, sizeof(HTTP1_RESP) - 1, GRPC_STATUS_UNAVAILABLE,
-           UNPARSEABLE_DETAIL_MSG);
+           HTTP1_DETAIL_MSG);
 
   return 0;
 }
diff --git a/test/core/end2end/cq_verifier.c b/test/core/end2end/cq_verifier.c
index 890309c44a..b77568058c 100644
--- a/test/core/end2end/cq_verifier.c
+++ b/test/core/end2end/cq_verifier.c
@@ -259,9 +259,10 @@ void cq_verify(cq_verifier *v) {
   gpr_strvec_destroy(&have_tags);
 }
 
-void cq_verify_empty(cq_verifier *v) {
-  gpr_timespec deadline = gpr_time_add(gpr_now(GPR_CLOCK_REALTIME),
-                                       gpr_time_from_seconds(1, GPR_TIMESPAN));
+void cq_verify_empty_timeout(cq_verifier *v, int timeout_sec) {
+  gpr_timespec deadline =
+      gpr_time_add(gpr_now(GPR_CLOCK_REALTIME),
+                   gpr_time_from_seconds(timeout_sec, GPR_TIMESPAN));
   grpc_event ev;
 
   GPR_ASSERT(v->expect.next == &v->expect && "expectation queue must be empty");
@@ -275,6 +276,8 @@ void cq_verify_empty(cq_verifier *v) {
   }
 }
 
+void cq_verify_empty(cq_verifier *v) { cq_verify_empty_timeout(v, 1); }
+
 static expectation *add(cq_verifier *v, grpc_completion_type type, void *tag) {
   expectation *e = gpr_malloc(sizeof(expectation));
   e->type = type;
diff --git a/test/core/end2end/cq_verifier.h b/test/core/end2end/cq_verifier.h
index 8c9a85c218..bf82468c9a 100644
--- a/test/core/end2end/cq_verifier.h
+++ b/test/core/end2end/cq_verifier.h
@@ -55,6 +55,9 @@ void cq_verify(cq_verifier *v);
 /* ensure that the completion queue is empty */
 void cq_verify_empty(cq_verifier *v);
 
+/* ensure that the completion queue is empty, waiting up to \a timeout secs. */
+void cq_verify_empty_timeout(cq_verifier *v, int timeout_sec);
+
 /* Various expectation matchers
    Any functions taking ... expect a NULL terminated list of key/value pairs
    (each pair using two parameter slots) of metadata that MUST be present in
diff --git a/test/core/end2end/end2end_nosec_tests.c b/test/core/end2end/end2end_nosec_tests.c
index f91d018dc8..3efd18cf2e 100644
--- a/test/core/end2end/end2end_nosec_tests.c
+++ b/test/core/end2end/end2end_nosec_tests.c
@@ -85,6 +85,8 @@ extern void invoke_large_request(grpc_end2end_test_config config);
 extern void invoke_large_request_pre_init(void);
 extern void large_metadata(grpc_end2end_test_config config);
 extern void large_metadata_pre_init(void);
+extern void load_reporting_hook(grpc_end2end_test_config config);
+extern void load_reporting_hook_pre_init(void);
 extern void max_concurrent_streams(grpc_end2end_test_config config);
 extern void max_concurrent_streams_pre_init(void);
 extern void max_message_length(grpc_end2end_test_config config);
@@ -148,6 +150,7 @@ void grpc_end2end_tests_pre_init(void) {
   idempotent_request_pre_init();
   invoke_large_request_pre_init();
   large_metadata_pre_init();
+  load_reporting_hook_pre_init();
   max_concurrent_streams_pre_init();
   max_message_length_pre_init();
   negative_deadline_pre_init();
@@ -197,6 +200,7 @@ void grpc_end2end_tests(int argc, char **argv,
     idempotent_request(config);
     invoke_large_request(config);
     large_metadata(config);
+    load_reporting_hook(config);
     max_concurrent_streams(config);
     max_message_length(config);
     negative_deadline(config);
@@ -304,6 +308,10 @@ void grpc_end2end_tests(int argc, char **argv,
       large_metadata(config);
       continue;
     }
+    if (0 == strcmp("load_reporting_hook", argv[i])) {
+      load_reporting_hook(config);
+      continue;
+    }
     if (0 == strcmp("max_concurrent_streams", argv[i])) {
       max_concurrent_streams(config);
       continue;
diff --git a/test/core/end2end/end2end_tests.c b/test/core/end2end/end2end_tests.c
index 1347043bd5..e3d791abc1 100644
--- a/test/core/end2end/end2end_tests.c
+++ b/test/core/end2end/end2end_tests.c
@@ -87,6 +87,8 @@ extern void invoke_large_request(grpc_end2end_test_config config);
 extern void invoke_large_request_pre_init(void);
 extern void large_metadata(grpc_end2end_test_config config);
 extern void large_metadata_pre_init(void);
+extern void load_reporting_hook(grpc_end2end_test_config config);
+extern void load_reporting_hook_pre_init(void);
 extern void max_concurrent_streams(grpc_end2end_test_config config);
 extern void max_concurrent_streams_pre_init(void);
 extern void max_message_length(grpc_end2end_test_config config);
@@ -151,6 +153,7 @@ void grpc_end2end_tests_pre_init(void) {
   idempotent_request_pre_init();
   invoke_large_request_pre_init();
   large_metadata_pre_init();
+  load_reporting_hook_pre_init();
   max_concurrent_streams_pre_init();
   max_message_length_pre_init();
   negative_deadline_pre_init();
@@ -201,6 +204,7 @@ void grpc_end2end_tests(int argc, char **argv,
     idempotent_request(config);
     invoke_large_request(config);
     large_metadata(config);
+    load_reporting_hook(config);
     max_concurrent_streams(config);
     max_message_length(config);
     negative_deadline(config);
@@ -312,6 +316,10 @@ void grpc_end2end_tests(int argc, char **argv,
       large_metadata(config);
       continue;
     }
+    if (0 == strcmp("load_reporting_hook", argv[i])) {
+      load_reporting_hook(config);
+      continue;
+    }
     if (0 == strcmp("max_concurrent_streams", argv[i])) {
       max_concurrent_streams(config);
       continue;
diff --git a/test/core/end2end/fixtures/h2_loadreporting.c b/test/core/end2end/fixtures/h2_load_reporting.c
index 4ed02f9728..f6d3923db9 100644
--- a/test/core/end2end/fixtures/h2_loadreporting.c
+++ b/test/core/end2end/fixtures/h2_load_reporting.c
@@ -52,18 +52,16 @@
 #include "test/core/util/port.h"
 #include "test/core/util/test_config.h"
 
-static grpc_load_reporting_config *g_client_lrc;
-static grpc_load_reporting_config *g_server_lrc;
-
-typedef struct fullstack_fixture_data {
+typedef struct load_reporting_fixture_data {
   char *localaddr;
-} fullstack_fixture_data;
+} load_reporting_fixture_data;
 
-static grpc_end2end_test_fixture chttp2_create_fixture_fullstack(
+static grpc_end2end_test_fixture chttp2_create_fixture_load_reporting(
     grpc_channel_args *client_args, grpc_channel_args *server_args) {
   grpc_end2end_test_fixture f;
   int port = grpc_pick_unused_port_or_die();
-  fullstack_fixture_data *ffd = gpr_malloc(sizeof(fullstack_fixture_data));
+  load_reporting_fixture_data *ffd =
+      gpr_malloc(sizeof(load_reporting_fixture_data));
   memset(&f, 0, sizeof(f));
 
   gpr_join_host_port(&ffd->localaddr, "localhost", port);
@@ -74,47 +72,20 @@ static grpc_end2end_test_fixture chttp2_create_fixture_fullstack(
   return f;
 }
 
-typedef struct {
-  int64_t total_bytes;
-  bool fully_processed;
-  uint32_t initial_token;
-  uint32_t final_token;
-} aggregated_bw_stats;
-
-static void sample_fn(const grpc_load_reporting_call_data *call_data,
-                      void *user_data) {
-  GPR_ASSERT(user_data != NULL);
-  aggregated_bw_stats *custom_stats = (aggregated_bw_stats *)user_data;
-  if (call_data == NULL) {
-    /* initial invocation */
-    custom_stats->initial_token = 0xDEADBEEF;
-  } else {
-    /* final invocation */
-    custom_stats->total_bytes =
-        (int64_t)(call_data->stats->transport_stream_stats.outgoing.data_bytes +
-                  call_data->stats->transport_stream_stats.incoming.data_bytes);
-    custom_stats->final_token = 0xCAFED00D;
-    custom_stats->fully_processed = true;
-  }
-}
-
-void chttp2_init_client_fullstack(grpc_end2end_test_fixture *f,
-                                  grpc_channel_args *client_args) {
-  fullstack_fixture_data *ffd = f->fixture_data;
-  grpc_arg arg = grpc_load_reporting_config_create_arg(g_client_lrc);
-  client_args = grpc_channel_args_copy_and_add(client_args, &arg, 1);
+void chttp2_init_client_load_reporting(grpc_end2end_test_fixture *f,
+                                       grpc_channel_args *client_args) {
+  load_reporting_fixture_data *ffd = f->fixture_data;
   f->client = grpc_insecure_channel_create(ffd->localaddr, client_args, NULL);
-  grpc_channel_args_destroy(client_args);
   GPR_ASSERT(f->client);
 }
 
-void chttp2_init_server_fullstack(grpc_end2end_test_fixture *f,
-                                  grpc_channel_args *server_args) {
-  fullstack_fixture_data *ffd = f->fixture_data;
+void chttp2_init_server_load_reporting(grpc_end2end_test_fixture *f,
+                                       grpc_channel_args *server_args) {
+  load_reporting_fixture_data *ffd = f->fixture_data;
+  grpc_arg arg = grpc_load_reporting_enable_arg();
   if (f->server) {
     grpc_server_destroy(f->server);
   }
-  grpc_arg arg = grpc_load_reporting_config_create_arg(g_server_lrc);
   server_args = grpc_channel_args_copy_and_add(server_args, &arg, 1);
   f->server = grpc_server_create(server_args, NULL);
   grpc_channel_args_destroy(server_args);
@@ -123,36 +94,23 @@ void chttp2_init_server_fullstack(grpc_end2end_test_fixture *f,
   grpc_server_start(f->server);
 }
 
-void chttp2_tear_down_fullstack(grpc_end2end_test_fixture *f) {
-  fullstack_fixture_data *ffd = f->fixture_data;
+void chttp2_tear_down_load_reporting(grpc_end2end_test_fixture *f) {
+  load_reporting_fixture_data *ffd = f->fixture_data;
   gpr_free(ffd->localaddr);
   gpr_free(ffd);
 }
 
 /* All test configurations */
 static grpc_end2end_test_config configs[] = {
-    {"chttp2/fullstack+loadreporting", FEATURE_MASK_SUPPORTS_DELAYED_CONNECTION,
-     chttp2_create_fixture_fullstack, chttp2_init_client_fullstack,
-     chttp2_init_server_fullstack, chttp2_tear_down_fullstack},
+    {"chttp2/fullstack+load_reporting",
+     FEATURE_MASK_SUPPORTS_DELAYED_CONNECTION,
+     chttp2_create_fixture_load_reporting, chttp2_init_client_load_reporting,
+     chttp2_init_server_load_reporting, chttp2_tear_down_load_reporting},
 };
 
 int main(int argc, char **argv) {
   size_t i;
 
-  aggregated_bw_stats *aggr_stats_client =
-      gpr_malloc(sizeof(aggregated_bw_stats));
-  aggr_stats_client->total_bytes = -1;
-  aggr_stats_client->fully_processed = false;
-  aggregated_bw_stats *aggr_stats_server =
-      gpr_malloc(sizeof(aggregated_bw_stats));
-  aggr_stats_server->total_bytes = -1;
-  aggr_stats_server->fully_processed = false;
-
-  g_client_lrc =
-      grpc_load_reporting_config_create(sample_fn, aggr_stats_client);
-  g_server_lrc =
-      grpc_load_reporting_config_create(sample_fn, aggr_stats_server);
-
   grpc_test_init(argc, argv);
   grpc_end2end_tests_pre_init();
   grpc_init();
@@ -163,22 +121,5 @@ int main(int argc, char **argv) {
 
   grpc_shutdown();
 
-  grpc_load_reporting_config_destroy(g_client_lrc);
-  grpc_load_reporting_config_destroy(g_server_lrc);
-
-  if (aggr_stats_client->fully_processed) {
-    GPR_ASSERT(aggr_stats_client->total_bytes >= 0);
-    GPR_ASSERT(aggr_stats_client->initial_token == 0xDEADBEEF);
-    GPR_ASSERT(aggr_stats_client->final_token == 0xCAFED00D);
-  }
-  if (aggr_stats_server->fully_processed) {
-    GPR_ASSERT(aggr_stats_server->total_bytes >= 0);
-    GPR_ASSERT(aggr_stats_server->initial_token == 0xDEADBEEF);
-    GPR_ASSERT(aggr_stats_server->final_token == 0xCAFED00D);
-  }
-
-  gpr_free(aggr_stats_client);
-  gpr_free(aggr_stats_server);
-
   return 0;
 }
diff --git a/test/core/end2end/fuzzers/hpack.dictionary b/test/core/end2end/fuzzers/hpack.dictionary
index 097e9a8922..af075c09ef 100644
--- a/test/core/end2end/fuzzers/hpack.dictionary
+++ b/test/core/end2end/fuzzers/hpack.dictionary
@@ -63,7 +63,8 @@
 "\x13if-unmodified-since"
 "\x0Dlast-modified"
 "\x04link"
-"\x0Eload-reporting"
+"\x16load-reporting-initial"
+"\x17load-reporting-trailing"
 "\x08location"
 "\x0Cmax-forwards"
 "\x07:method"
@@ -137,7 +138,8 @@
 "\x00\x13if-unmodified-since\x00"
 "\x00\x0Dlast-modified\x00"
 "\x00\x04link\x00"
-"\x00\x0Eload-reporting\x00"
+"\x00\x16load-reporting-initial\x00"
+"\x00\x17load-reporting-trailing\x00"
 "\x00\x08location\x00"
 "\x00\x0Cmax-forwards\x00"
 "\x00\x07:method\x03GET"
diff --git a/test/core/end2end/gen_build_yaml.py b/test/core/end2end/gen_build_yaml.py
index 8655da65d9..e59b7dc9fb 100755
--- a/test/core/end2end/gen_build_yaml.py
+++ b/test/core/end2end/gen_build_yaml.py
@@ -53,13 +53,13 @@ fd_unsecure_fixture_options = default_unsecure_fixture_options._replace(
 END2END_FIXTURES = {
     'h2_compress': default_unsecure_fixture_options,
     'h2_census': default_unsecure_fixture_options,
+    'h2_load_reporting': default_unsecure_fixture_options,
     'h2_fakesec': default_secure_fixture_options._replace(ci_mac=False),
     'h2_fd': fd_unsecure_fixture_options,
     'h2_full': default_unsecure_fixture_options,
     'h2_full+pipe': default_unsecure_fixture_options._replace(
         platforms=['linux']),
     'h2_full+trace': default_unsecure_fixture_options._replace(tracing=True),
-    'h2_loadreporting': default_unsecure_fixture_options,
     'h2_oauth2': default_secure_fixture_options._replace(ci_mac=False),
     'h2_proxy': default_unsecure_fixture_options._replace(includes_proxy=True,
                                                           ci_mac=False),
@@ -116,6 +116,7 @@ END2END_TESTS = {
     'network_status_change': default_test_options,
     'no_op': default_test_options,
     'payload': default_test_options,
+    'load_reporting_hook': default_test_options,
     'ping_pong_streaming': default_test_options,
     'ping': connectivity_test_options._replace(proxyable=False),
     'registered_call': default_test_options,
diff --git a/test/core/end2end/tests/filter_causes_close.c b/test/core/end2end/tests/filter_causes_close.c
index 8b0c8dba61..c6c36d668b 100644
--- a/test/core/end2end/tests/filter_causes_close.c
+++ b/test/core/end2end/tests/filter_causes_close.c
@@ -240,7 +240,7 @@ static grpc_error *init_call_elem(grpc_exec_ctx *exec_ctx,
 }
 
 static void destroy_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
-                              const grpc_call_stats *stats,
+                              const grpc_call_final_info *final_info,
                               void *and_free_memory) {}
 
 static void init_channel_elem(grpc_exec_ctx *exec_ctx,
diff --git a/test/core/end2end/tests/load_reporting_hook.c b/test/core/end2end/tests/load_reporting_hook.c
new file mode 100644
index 0000000000..2c6519881a
--- /dev/null
+++ b/test/core/end2end/tests/load_reporting_hook.c
@@ -0,0 +1,321 @@
+/*
+ *
+ * Copyright 2016, 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 "test/core/end2end/end2end_tests.h"
+
+#include <string.h>
+
+#include <grpc/byte_buffer.h>
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
+#include <grpc/support/time.h>
+#include <grpc/support/useful.h>
+#include "test/core/end2end/cq_verifier.h"
+
+#include "src/core/ext/load_reporting/load_reporting.h"
+#include "src/core/ext/load_reporting/load_reporting_filter.h"
+#include "src/core/lib/channel/channel_args.h"
+#include "src/core/lib/transport/static_metadata.h"
+
+enum { TIMEOUT = 200000 };
+
+static void *tag(intptr_t t) { return (void *)t; }
+
+typedef struct {
+  gpr_mu mu;
+  intptr_t channel_id;
+  intptr_t call_id;
+
+  char *initial_md_str;
+  char *trailing_md_str;
+  char *method_name;
+
+  uint64_t incoming_bytes;
+  uint64_t outgoing_bytes;
+
+  grpc_status_code call_final_status;
+
+  bool fully_processed;
+} load_reporting_data;
+
+static grpc_end2end_test_fixture begin_test(grpc_end2end_test_config config,
+                                            const char *test_name,
+                                            grpc_channel_args *client_args,
+                                            grpc_channel_args *server_args) {
+  grpc_end2end_test_fixture f;
+  gpr_log(GPR_INFO, "%s/%s", test_name, config.name);
+
+  f = config.create_fixture(client_args, server_args);
+  config.init_server(&f, server_args);
+  config.init_client(&f, client_args);
+
+  return f;
+}
+
+static gpr_timespec n_seconds_time(int n) {
+  return GRPC_TIMEOUT_SECONDS_TO_DEADLINE(n);
+}
+
+static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
+
+static void drain_cq(grpc_completion_queue *cq) {
+  grpc_event ev;
+  do {
+    ev = grpc_completion_queue_next(cq, five_seconds_time(), NULL);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
+}
+
+static void shutdown_server(grpc_end2end_test_fixture *f) {
+  if (!f->server) return;
+  grpc_server_shutdown_and_notify(f->server, f->cq, tag(1000));
+  GPR_ASSERT(grpc_completion_queue_pluck(
+                 f->cq, tag(1000), GRPC_TIMEOUT_SECONDS_TO_DEADLINE(5), NULL)
+                 .type == GRPC_OP_COMPLETE);
+  grpc_server_destroy(f->server);
+  f->server = NULL;
+}
+
+static void shutdown_client(grpc_end2end_test_fixture *f) {
+  if (!f->client) return;
+  grpc_channel_destroy(f->client);
+  f->client = NULL;
+}
+
+static void end_test(grpc_end2end_test_fixture *f) {
+  shutdown_server(f);
+  shutdown_client(f);
+
+  grpc_completion_queue_shutdown(f->cq);
+  drain_cq(f->cq);
+  grpc_completion_queue_destroy(f->cq);
+}
+
+static void request_response_with_payload(grpc_end2end_test_fixture f,
+                                          const char *method_name,
+                                          const char *request_msg,
+                                          const char *response_msg,
+                                          grpc_metadata *initial_lr_metadata,
+                                          grpc_metadata *trailing_lr_metadata) {
+  gpr_slice request_payload_slice = gpr_slice_from_static_string(request_msg);
+  gpr_slice response_payload_slice = gpr_slice_from_static_string(response_msg);
+  grpc_call *c;
+  grpc_call *s;
+  grpc_byte_buffer *request_payload =
+      grpc_raw_byte_buffer_create(&request_payload_slice, 1);
+  grpc_byte_buffer *response_payload =
+      grpc_raw_byte_buffer_create(&response_payload_slice, 1);
+  gpr_timespec deadline = five_seconds_time();
+  cq_verifier *cqv = cq_verifier_create(f.cq);
+  grpc_op ops[6];
+  grpc_op *op;
+  grpc_metadata_array initial_metadata_recv;
+  grpc_metadata_array trailing_metadata_recv;
+  grpc_metadata_array request_metadata_recv;
+  grpc_byte_buffer *request_payload_recv = NULL;
+  grpc_byte_buffer *response_payload_recv = NULL;
+  grpc_call_details call_details;
+  grpc_status_code status;
+  grpc_call_error error;
+  char *details = NULL;
+  size_t details_capacity = 0;
+  int was_cancelled = 2;
+
+  c = grpc_channel_create_call(f.client, NULL, GRPC_PROPAGATE_DEFAULTS, f.cq,
+                               method_name, "foo.test.google.fr", deadline,
+                               NULL);
+  GPR_ASSERT(c);
+
+  grpc_metadata_array_init(&initial_metadata_recv);
+  grpc_metadata_array_init(&trailing_metadata_recv);
+  grpc_metadata_array_init(&request_metadata_recv);
+  grpc_call_details_init(&call_details);
+
+  memset(ops, 0, sizeof(ops));
+  op = ops;
+  op->op = GRPC_OP_SEND_INITIAL_METADATA;
+  GPR_ASSERT(initial_lr_metadata != NULL);
+  op->data.send_initial_metadata.count = 1;
+  op->data.send_initial_metadata.metadata = initial_lr_metadata;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  op->op = GRPC_OP_SEND_MESSAGE;
+  op->data.send_message = request_payload;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  op->op = GRPC_OP_SEND_CLOSE_FROM_CLIENT;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  op->op = GRPC_OP_RECV_INITIAL_METADATA;
+  op->data.recv_initial_metadata = &initial_metadata_recv;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  op->op = GRPC_OP_RECV_MESSAGE;
+  op->data.recv_message = &response_payload_recv;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  op->op = GRPC_OP_RECV_STATUS_ON_CLIENT;
+  op->data.recv_status_on_client.trailing_metadata = &trailing_metadata_recv;
+  op->data.recv_status_on_client.status = &status;
+  op->data.recv_status_on_client.status_details = &details;
+  op->data.recv_status_on_client.status_details_capacity = &details_capacity;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
+  GPR_ASSERT(GRPC_CALL_OK == error);
+
+  error =
+      grpc_server_request_call(f.server, &s, &call_details,
+                               &request_metadata_recv, f.cq, f.cq, tag(101));
+  GPR_ASSERT(GRPC_CALL_OK == error);
+  cq_expect_completion(cqv, tag(101), 1);
+  cq_verify(cqv);
+
+  memset(ops, 0, sizeof(ops));
+  op = ops;
+  op->op = GRPC_OP_SEND_INITIAL_METADATA;
+  op->data.send_initial_metadata.count = 0;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  op->op = GRPC_OP_RECV_MESSAGE;
+  op->data.recv_message = &request_payload_recv;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
+  GPR_ASSERT(GRPC_CALL_OK == error);
+
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_verify(cqv);
+
+  memset(ops, 0, sizeof(ops));
+  op = ops;
+  op->op = GRPC_OP_RECV_CLOSE_ON_SERVER;
+  op->data.recv_close_on_server.cancelled = &was_cancelled;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  op->op = GRPC_OP_SEND_MESSAGE;
+  op->data.send_message = response_payload;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  op->op = GRPC_OP_SEND_STATUS_FROM_SERVER;
+  GPR_ASSERT(trailing_lr_metadata != NULL);
+  op->data.send_status_from_server.trailing_metadata_count = 1;
+  op->data.send_status_from_server.trailing_metadata = trailing_lr_metadata;
+  op->data.send_status_from_server.status = GRPC_STATUS_OK;
+  op->data.send_status_from_server.status_details = "xyz";
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(103), NULL);
+  GPR_ASSERT(GRPC_CALL_OK == error);
+
+  cq_expect_completion(cqv, tag(103), 1);
+  cq_expect_completion(cqv, tag(1), 1);
+  cq_verify(cqv);
+
+  GPR_ASSERT(status == GRPC_STATUS_OK);
+
+  gpr_free(details);
+  grpc_metadata_array_destroy(&initial_metadata_recv);
+  grpc_metadata_array_destroy(&trailing_metadata_recv);
+  grpc_metadata_array_destroy(&request_metadata_recv);
+  grpc_call_details_destroy(&call_details);
+
+  grpc_call_destroy(c);
+  grpc_call_destroy(s);
+
+  cq_verifier_destroy(cqv);
+
+  grpc_byte_buffer_destroy(request_payload);
+  grpc_byte_buffer_destroy(response_payload);
+  grpc_byte_buffer_destroy(request_payload_recv);
+  grpc_byte_buffer_destroy(response_payload_recv);
+}
+
+/* override the default for testing purposes */
+extern void (*g_load_reporting_fn)(
+    const grpc_load_reporting_call_data *call_data);
+
+static void test_load_reporting_hook(grpc_end2end_test_config config) {
+  /* TODO(dgq): this test is currently a noop until LR is fully defined.
+   * Leaving the rest here, as it'll likely be reusable. */
+
+  /* Introduce load reporting for the server through its arguments */
+  grpc_arg arg = grpc_load_reporting_enable_arg();
+  grpc_channel_args *lr_server_args =
+      grpc_channel_args_copy_and_add(NULL, &arg, 1);
+
+  grpc_end2end_test_fixture f =
+      begin_test(config, "test_load_reporting_hook", NULL, lr_server_args);
+
+  const char *method_name = "/gRPCFTW";
+  const char *request_msg = "the msg from the client";
+  const char *response_msg = "... and the response from the server";
+
+  grpc_metadata initial_lr_metadata;
+  grpc_metadata trailing_lr_metadata;
+
+  initial_lr_metadata.key = GRPC_LOAD_REPORTING_INITIAL_MD_KEY;
+  initial_lr_metadata.value = "client-token";
+  initial_lr_metadata.value_length = strlen(initial_lr_metadata.value);
+  memset(&initial_lr_metadata.internal_data, 0,
+         sizeof(initial_lr_metadata.internal_data));
+
+  trailing_lr_metadata.key = GRPC_LOAD_REPORTING_TRAILING_MD_KEY;
+  trailing_lr_metadata.value = "server-token";
+  trailing_lr_metadata.value_length = strlen(trailing_lr_metadata.value);
+  memset(&trailing_lr_metadata.internal_data, 0,
+         sizeof(trailing_lr_metadata.internal_data));
+
+  request_response_with_payload(f, method_name, request_msg, response_msg,
+                                &initial_lr_metadata, &trailing_lr_metadata);
+  end_test(&f);
+  grpc_channel_args_destroy(lr_server_args);
+  config.tear_down_data(&f);
+}
+
+void load_reporting_hook(grpc_end2end_test_config config) {
+  test_load_reporting_hook(config);
+}
+
+void load_reporting_hook_pre_init(void) {}