Merge with master

1 files changed, 141 insertions, 0 deletions

diff --git a/test/core/channel/channel_stack_builder_test.cc b/test/core/channel/channel_stack_builder_test.cc
new file mode 100644
index 0000000000..3ed73242a7
--- /dev/null
+++ b/test/core/channel/channel_stack_builder_test.cc
@@ -0,0 +1,141 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include "src/core/lib/channel/channel_stack_builder.h"
+
+#include <limits.h>
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
+
+#include "src/core/lib/slice/slice_internal.h"
+#include "src/core/lib/surface/channel_init.h"
+#include "test/core/util/test_config.h"
+
+static grpc_error* channel_init_func(grpc_channel_element* elem,
+                                     grpc_channel_element_args* args) {
+  return GRPC_ERROR_NONE;
+}
+
+static grpc_error* call_init_func(grpc_call_element* elem,
+                                  const grpc_call_element_args* args) {
+  return GRPC_ERROR_NONE;
+}
+
+static void channel_destroy_func(grpc_channel_element* elem) {}
+
+static void call_destroy_func(grpc_call_element* elem,
+                              const grpc_call_final_info* final_info,
+                              grpc_closure* ignored) {}
+
+static void call_func(grpc_call_element* elem,
+                      grpc_transport_stream_op_batch* op) {}
+
+static void channel_func(grpc_channel_element* elem, grpc_transport_op* op) {
+  if (op->disconnect_with_error != GRPC_ERROR_NONE) {
+    GRPC_ERROR_UNREF(op->disconnect_with_error);
+  }
+  GRPC_CLOSURE_SCHED(op->on_consumed, GRPC_ERROR_NONE);
+}
+
+bool g_replacement_fn_called = false;
+bool g_original_fn_called = false;
+void set_arg_once_fn(grpc_channel_stack* channel_stack,
+                     grpc_channel_element* elem, void* arg) {
+  bool* called = static_cast<bool*>(arg);
+  // Make sure this function is only called once per arg.
+  GPR_ASSERT(*called == false);
+  *called = true;
+}
+
+static void test_channel_stack_builder_filter_replace(void) {
+  grpc_channel* channel =
+      grpc_insecure_channel_create("target name isn't used", NULL, NULL);
+  GPR_ASSERT(channel != NULL);
+  // Make sure the high priority filter has been created.
+  GPR_ASSERT(g_replacement_fn_called);
+  // ... and that the low priority one hasn't.
+  GPR_ASSERT(!g_original_fn_called);
+  grpc_channel_destroy(channel);
+}
+
+const grpc_channel_filter replacement_filter = {
+    call_func,
+    channel_func,
+    0,
+    call_init_func,
+    grpc_call_stack_ignore_set_pollset_or_pollset_set,
+    call_destroy_func,
+    0,
+    channel_init_func,
+    channel_destroy_func,
+    grpc_channel_next_get_info,
+    "filter_name"};
+
+const grpc_channel_filter original_filter = {
+    call_func,
+    channel_func,
+    0,
+    call_init_func,
+    grpc_call_stack_ignore_set_pollset_or_pollset_set,
+    call_destroy_func,
+    0,
+    channel_init_func,
+    channel_destroy_func,
+    grpc_channel_next_get_info,
+    "filter_name"};
+
+static bool add_replacement_filter(grpc_channel_stack_builder* builder,
+                                   void* arg) {
+  const grpc_channel_filter* filter =
+      static_cast<const grpc_channel_filter*>(arg);
+  // Get rid of any other version of the filter, as determined by having the
+  // same name.
+  GPR_ASSERT(grpc_channel_stack_builder_remove_filter(builder, filter->name));
+  return grpc_channel_stack_builder_prepend_filter(
+      builder, filter, set_arg_once_fn, &g_replacement_fn_called);
+}
+
+static bool add_original_filter(grpc_channel_stack_builder* builder,
+                                void* arg) {
+  return grpc_channel_stack_builder_prepend_filter(
+      builder, (const grpc_channel_filter*)arg, set_arg_once_fn,
+      &g_original_fn_called);
+}
+
+static void init_plugin(void) {
+  grpc_channel_init_register_stage(GRPC_CLIENT_CHANNEL, INT_MAX,
+                                   add_original_filter,
+                                   (void*)&original_filter);
+  grpc_channel_init_register_stage(GRPC_CLIENT_CHANNEL, INT_MAX,
+                                   add_replacement_filter,
+                                   (void*)&replacement_filter);
+}
+
+static void destroy_plugin(void) {}
+
+int main(int argc, char** argv) {
+  grpc_test_init(argc, argv);
+  grpc_register_plugin(init_plugin, destroy_plugin);
+  grpc_init();
+  test_channel_stack_builder_filter_replace();
+  grpc_shutdown();
+  return 0;
+}