Merge github.com:grpc/grpc into hiertune

1 files changed, 153 insertions, 0 deletions

diff --git a/src/core/ext/filters/client_channel/lb_policy/grpclb/client_load_reporting_filter.c b/src/core/ext/filters/client_channel/lb_policy/grpclb/client_load_reporting_filter.c
new file mode 100644
index 0000000000..67baa46de7
--- /dev/null
+++ b/src/core/ext/filters/client_channel/lb_policy/grpclb/client_load_reporting_filter.c
@@ -0,0 +1,153 @@
+/*
+ *
+ * Copyright 2017, 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/ext/filters/client_channel/lb_policy/grpclb/client_load_reporting_filter.h"
+
+#include <grpc/support/atm.h>
+#include <grpc/support/log.h>
+
+#include "src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb_client_stats.h"
+#include "src/core/lib/iomgr/error.h"
+#include "src/core/lib/profiling/timers.h"
+
+static grpc_error *init_channel_elem(grpc_exec_ctx *exec_ctx,
+                                     grpc_channel_element *elem,
+                                     grpc_channel_element_args *args) {
+  return GRPC_ERROR_NONE;
+}
+
+static void destroy_channel_elem(grpc_exec_ctx *exec_ctx,
+                                 grpc_channel_element *elem) {}
+
+typedef struct {
+  // Stats object to update.
+  grpc_grpclb_client_stats *client_stats;
+  // State for intercepting send_initial_metadata.
+  grpc_closure on_complete_for_send;
+  grpc_closure *original_on_complete_for_send;
+  bool send_initial_metadata_succeeded;
+  // State for intercepting recv_initial_metadata.
+  grpc_closure recv_initial_metadata_ready;
+  grpc_closure *original_recv_initial_metadata_ready;
+  bool recv_initial_metadata_succeeded;
+} call_data;
+
+static void on_complete_for_send(grpc_exec_ctx *exec_ctx, void *arg,
+                                 grpc_error *error) {
+  call_data *calld = arg;
+  if (error == GRPC_ERROR_NONE) {
+    calld->send_initial_metadata_succeeded = true;
+  }
+  grpc_closure_run(exec_ctx, calld->original_on_complete_for_send,
+                   GRPC_ERROR_REF(error));
+}
+
+static void recv_initial_metadata_ready(grpc_exec_ctx *exec_ctx, void *arg,
+                                        grpc_error *error) {
+  call_data *calld = arg;
+  if (error == GRPC_ERROR_NONE) {
+    calld->recv_initial_metadata_succeeded = true;
+  }
+  grpc_closure_run(exec_ctx, calld->original_recv_initial_metadata_ready,
+                   GRPC_ERROR_REF(error));
+}
+
+static grpc_error *init_call_elem(grpc_exec_ctx *exec_ctx,
+                                  grpc_call_element *elem,
+                                  const grpc_call_element_args *args) {
+  call_data *calld = elem->call_data;
+  // Get stats object from context and take a ref.
+  GPR_ASSERT(args->context != NULL);
+  GPR_ASSERT(args->context[GRPC_GRPCLB_CLIENT_STATS].value != NULL);
+  calld->client_stats = grpc_grpclb_client_stats_ref(
+      args->context[GRPC_GRPCLB_CLIENT_STATS].value);
+  // Record call started.
+  grpc_grpclb_client_stats_add_call_started(calld->client_stats);
+  return GRPC_ERROR_NONE;
+}
+
+static void destroy_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
+                              const grpc_call_final_info *final_info,
+                              grpc_closure *ignored) {
+  call_data *calld = elem->call_data;
+  // Record call finished, optionally setting client_failed_to_send and
+  // received.
+  grpc_grpclb_client_stats_add_call_finished(
+      false /* drop_for_rate_limiting */, false /* drop_for_load_balancing */,
+      !calld->send_initial_metadata_succeeded /* client_failed_to_send */,
+      calld->recv_initial_metadata_succeeded /* known_received */,
+      calld->client_stats);
+  // All done, so unref the stats object.
+  grpc_grpclb_client_stats_unref(calld->client_stats);
+}
+
+static void start_transport_stream_op_batch(
+    grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
+    grpc_transport_stream_op_batch *batch) {
+  call_data *calld = elem->call_data;
+  GPR_TIMER_BEGIN("clr_start_transport_stream_op_batch", 0);
+  // Intercept send_initial_metadata.
+  if (batch->send_initial_metadata) {
+    calld->original_on_complete_for_send = batch->on_complete;
+    grpc_closure_init(&calld->on_complete_for_send, on_complete_for_send, calld,
+                      grpc_schedule_on_exec_ctx);
+    batch->on_complete = &calld->on_complete_for_send;
+  }
+  // Intercept recv_initial_metadata.
+  if (batch->recv_initial_metadata) {
+    calld->original_recv_initial_metadata_ready =
+        batch->payload->recv_initial_metadata.recv_initial_metadata_ready;
+    grpc_closure_init(&calld->recv_initial_metadata_ready,
+                      recv_initial_metadata_ready, calld,
+                      grpc_schedule_on_exec_ctx);
+    batch->payload->recv_initial_metadata.recv_initial_metadata_ready =
+        &calld->recv_initial_metadata_ready;
+  }
+  // Chain to next filter.
+  grpc_call_next_op(exec_ctx, elem, batch);
+  GPR_TIMER_END("clr_start_transport_stream_op_batch", 0);
+}
+
+const grpc_channel_filter grpc_client_load_reporting_filter = {
+    start_transport_stream_op_batch,
+    grpc_channel_next_op,
+    sizeof(call_data),
+    init_call_elem,
+    grpc_call_stack_ignore_set_pollset_or_pollset_set,
+    destroy_call_elem,
+    0,  // sizeof(channel_data)
+    init_channel_elem,
+    destroy_channel_elem,
+    grpc_call_next_get_peer,
+    grpc_channel_next_get_info,
+    "client_load_reporting"};