Merge github.com:grpc/grpc into write_completion

2 files changed, 164 insertions, 0 deletions

diff --git a/test/core/channel/BUILD b/test/core/channel/BUILD
index ef861cc5e7..5ac77c449b 100644
--- a/test/core/channel/BUILD
+++ b/test/core/channel/BUILD
@@ -41,3 +41,15 @@ grpc_cc_test(
         "//test/core/util:grpc_test_util",
     ],
 )
+
+grpc_cc_test(
+    name = "channel_stack_builder_test",
+    srcs = ["channel_stack_builder_test.c"],
+    language = "C",
+    deps = [
+        "//:gpr",
+        "//:grpc",
+        "//test/core/util:gpr_test_util",
+        "//test/core/util:grpc_test_util",
+    ],
+)
diff --git a/test/core/channel/channel_stack_builder_test.c b/test/core/channel/channel_stack_builder_test.c
new file mode 100644
index 0000000000..be6afb7c07
--- /dev/null
+++ b/test/core/channel/channel_stack_builder_test.c
@@ -0,0 +1,152 @@
+/*
+ *
+ * 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_exec_ctx *exec_ctx,
+                                     grpc_channel_element *elem,
+                                     grpc_channel_element_args *args) {
+  return GRPC_ERROR_NONE;
+}
+
+static grpc_error *call_init_func(grpc_exec_ctx *exec_ctx,
+                                  grpc_call_element *elem,
+                                  const grpc_call_element_args *args) {
+  return GRPC_ERROR_NONE;
+}
+
+static void channel_destroy_func(grpc_exec_ctx *exec_ctx,
+                                 grpc_channel_element *elem) {}
+
+static void call_destroy_func(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
+                              const grpc_call_final_info *final_info,
+                              grpc_closure *ignored) {}
+
+static void call_func(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
+                      grpc_transport_stream_op_batch *op) {}
+
+static void channel_func(grpc_exec_ctx *exec_ctx, 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(exec_ctx, op->on_consumed, GRPC_ERROR_NONE);
+}
+
+static char *get_peer(grpc_exec_ctx *exec_ctx, grpc_call_element *elem) {
+  return gpr_strdup("peer");
+}
+
+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 = 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,
+    get_peer,
+    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,
+    get_peer,
+    grpc_channel_next_get_info,
+    "filter_name"};
+
+static bool add_replacement_filter(grpc_exec_ctx *exec_ctx,
+                                   grpc_channel_stack_builder *builder,
+                                   void *arg) {
+  const grpc_channel_filter *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_exec_ctx *exec_ctx,
+                                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;
+}