1 files changed, 199 insertions, 0 deletions
diff --git a/src/core/lib/surface/lame_client.cc b/src/core/lib/surface/lame_client.cc
new file mode 100644
index 0000000000..88f4eaac08
--- /dev/null
+++ b/src/core/lib/surface/lame_client.cc
@@ -0,0 +1,199 @@
+/*
+ *
+ * Copyright 2015, 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 <grpc/grpc.h>
+
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+
+#include "src/core/lib/support/atomic.h"
+
+extern "C" {
+#include "src/core/lib/channel/channel_stack.h"
+#include "src/core/lib/support/string.h"
+#include "src/core/lib/surface/api_trace.h"
+#include "src/core/lib/surface/call.h"
+#include "src/core/lib/surface/channel.h"
+#include "src/core/lib/surface/lame_client.h"
+#include "src/core/lib/transport/static_metadata.h"
+}
+
+namespace grpc_core {
+
+namespace {
+
+struct CallData {
+  grpc_linked_mdelem status;
+  grpc_linked_mdelem details;
+  grpc_core::atomic<bool> filled_metadata;
+};
+
+struct ChannelData {
+  grpc_status_code error_code;
+  const char *error_message;
+};
+
+static void fill_metadata(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
+                          grpc_metadata_batch *mdb) {
+  CallData *calld = static_cast<CallData *>(elem->call_data);
+  bool expected = false;
+  if (!calld->filled_metadata.compare_exchange_strong(
+          expected, true, grpc_core::memory_order_relaxed,
+          grpc_core::memory_order_relaxed)) {
+    return;
+  }
+  ChannelData *chand = static_cast<ChannelData *>(elem->channel_data);
+  char tmp[GPR_LTOA_MIN_BUFSIZE];
+  gpr_ltoa(chand->error_code, tmp);
+  calld->status.md = grpc_mdelem_from_slices(
+      exec_ctx, GRPC_MDSTR_GRPC_STATUS, grpc_slice_from_copied_string(tmp));
+  calld->details.md = grpc_mdelem_from_slices(
+      exec_ctx, GRPC_MDSTR_GRPC_MESSAGE,
+      grpc_slice_from_copied_string(chand->error_message));
+  calld->status.prev = calld->details.next = NULL;
+  calld->status.next = &calld->details;
+  calld->details.prev = &calld->status;
+  mdb->list.head = &calld->status;
+  mdb->list.tail = &calld->details;
+  mdb->list.count = 2;
+  mdb->deadline = gpr_inf_future(GPR_CLOCK_REALTIME);
+}
+
+static void lame_start_transport_stream_op_batch(
+    grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
+    grpc_transport_stream_op_batch *op) {
+  if (op->recv_initial_metadata) {
+    fill_metadata(exec_ctx, elem,
+                  op->payload->recv_initial_metadata.recv_initial_metadata);
+  } else if (op->recv_trailing_metadata) {
+    fill_metadata(exec_ctx, elem,
+                  op->payload->recv_trailing_metadata.recv_trailing_metadata);
+  }
+  grpc_transport_stream_op_batch_finish_with_failure(
+      exec_ctx, op,
+      GRPC_ERROR_CREATE_FROM_STATIC_STRING("lame client channel"));
+}
+
+static char *lame_get_peer(grpc_exec_ctx *exec_ctx, grpc_call_element *elem) {
+  return NULL;
+}
+
+static void lame_get_channel_info(grpc_exec_ctx *exec_ctx,
+                                  grpc_channel_element *elem,
+                                  const grpc_channel_info *channel_info) {}
+
+static void lame_start_transport_op(grpc_exec_ctx *exec_ctx,
+                                    grpc_channel_element *elem,
+                                    grpc_transport_op *op) {
+  if (op->on_connectivity_state_change) {
+    GPR_ASSERT(*op->connectivity_state != GRPC_CHANNEL_SHUTDOWN);
+    *op->connectivity_state = GRPC_CHANNEL_SHUTDOWN;
+    grpc_closure_sched(exec_ctx, op->on_connectivity_state_change,
+                       GRPC_ERROR_NONE);
+  }
+  if (op->send_ping != NULL) {
+    grpc_closure_sched(
+        exec_ctx, op->send_ping,
+        GRPC_ERROR_CREATE_FROM_STATIC_STRING("lame client channel"));
+  }
+  GRPC_ERROR_UNREF(op->disconnect_with_error);
+  if (op->on_consumed != NULL) {
+    grpc_closure_sched(exec_ctx, op->on_consumed, GRPC_ERROR_NONE);
+  }
+}
+
+static grpc_error *init_call_elem(grpc_exec_ctx *exec_ctx,
+                                  grpc_call_element *elem,
+                                  const grpc_call_element_args *args) {
+  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 *then_schedule_closure) {
+  grpc_closure_sched(exec_ctx, then_schedule_closure, GRPC_ERROR_NONE);
+}
+
+static grpc_error *init_channel_elem(grpc_exec_ctx *exec_ctx,
+                                     grpc_channel_element *elem,
+                                     grpc_channel_element_args *args) {
+  GPR_ASSERT(args->is_first);
+  GPR_ASSERT(args->is_last);
+  return GRPC_ERROR_NONE;
+}
+
+static void destroy_channel_elem(grpc_exec_ctx *exec_ctx,
+                                 grpc_channel_element *elem) {}
+
+}  // namespace
+
+}  // namespace grpc_core
+
+extern "C" const grpc_channel_filter grpc_lame_filter = {
+    grpc_core::lame_start_transport_stream_op_batch,
+    grpc_core::lame_start_transport_op,
+    sizeof(grpc_core::CallData),
+    grpc_core::init_call_elem,
+    grpc_call_stack_ignore_set_pollset_or_pollset_set,
+    grpc_core::destroy_call_elem,
+    sizeof(grpc_core::ChannelData),
+    grpc_core::init_channel_elem,
+    grpc_core::destroy_channel_elem,
+    grpc_core::lame_get_peer,
+    grpc_core::lame_get_channel_info,
+    "lame-client",
+};
+
+#define CHANNEL_STACK_FROM_CHANNEL(c) ((grpc_channel_stack *)((c) + 1))
+
+grpc_channel *grpc_lame_client_channel_create(const char *target,
+                                              grpc_status_code error_code,
+                                              const char *error_message) {
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_channel_element *elem;
+  grpc_channel *channel = grpc_channel_create(&exec_ctx, target, NULL,
+                                              GRPC_CLIENT_LAME_CHANNEL, NULL);
+  elem = grpc_channel_stack_element(grpc_channel_get_channel_stack(channel), 0);
+  GRPC_API_TRACE(
+      "grpc_lame_client_channel_create(target=%s, error_code=%d, "
+      "error_message=%s)",
+      3, (target, (int)error_code, error_message));
+  GPR_ASSERT(elem->filter == &grpc_lame_filter);
+  auto chand = static_cast<grpc_core::ChannelData *>(elem->channel_data);
+  chand->error_code = error_code;
+  chand->error_message = error_message;
+  grpc_exec_ctx_finish(&exec_ctx);
+  return channel;
+}