Initial checkin of gRPC to third_party/

third_party/grpc/src/core/surface/lame_client.c

+/*
+ *
+ * Copyright 2015-2016, 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 <grpc/grpc.h>
+
+#include <string.h>
+
+#include "src/core/channel/channel_stack.h"
+#include "src/core/support/string.h"
+#include "src/core/surface/api_trace.h"
+#include "src/core/surface/channel.h"
+#include "src/core/surface/call.h"
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+
+typedef struct {
+  grpc_linked_mdelem status;
+  grpc_linked_mdelem details;
+} call_data;
+
+typedef struct {
+  grpc_status_code error_code;
+  const char *error_message;
+} channel_data;
+
+static void fill_metadata(grpc_call_element *elem, grpc_metadata_batch *mdb) {
+  call_data *calld = elem->call_data;
+  channel_data *chand = elem->channel_data;
+  char tmp[GPR_LTOA_MIN_BUFSIZE];
+  gpr_ltoa(chand->error_code, tmp);
+  calld->status.md = grpc_mdelem_from_strings("grpc-status", tmp);
+  calld->details.md =
+      grpc_mdelem_from_strings("grpc-message", 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->deadline = gpr_inf_future(GPR_CLOCK_REALTIME);
+}
+
+static void lame_start_transport_stream_op(grpc_exec_ctx *exec_ctx,
+                                           grpc_call_element *elem,
+                                           grpc_transport_stream_op *op) {
+  GRPC_CALL_LOG_OP(GPR_INFO, elem, op);
+  if (op->recv_initial_metadata != NULL) {
+    fill_metadata(elem, op->recv_initial_metadata);
+  } else if (op->recv_trailing_metadata != NULL) {
+    fill_metadata(elem, op->recv_trailing_metadata);
+  }
+  grpc_transport_stream_op_finish_with_failure(exec_ctx, op);
+}
+
+static char *lame_get_peer(grpc_exec_ctx *exec_ctx, grpc_call_element *elem) {
+  return NULL;
+}
+
+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_FATAL_FAILURE);
+    *op->connectivity_state = GRPC_CHANNEL_FATAL_FAILURE;
+    op->on_connectivity_state_change->cb(
+        exec_ctx, op->on_connectivity_state_change->cb_arg, 1);
+  }
+  if (op->on_consumed != NULL) {
+    op->on_consumed->cb(exec_ctx, op->on_consumed->cb_arg, 1);
+  }
+}
+
+static void init_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
+                           grpc_call_element_args *args) {}
+
+static void destroy_call_elem(grpc_exec_ctx *exec_ctx,
+                              grpc_call_element *elem) {}
+
+static void 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);
+}
+
+static void destroy_channel_elem(grpc_exec_ctx *exec_ctx,
+                                 grpc_channel_element *elem) {}
+
+static const grpc_channel_filter lame_filter = {
+    lame_start_transport_stream_op, lame_start_transport_op, sizeof(call_data),
+    init_call_elem, grpc_call_stack_ignore_set_pollset, destroy_call_elem,
+    sizeof(channel_data), init_channel_elem, destroy_channel_elem,
+    lame_get_peer, "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_channel *channel;
+  grpc_channel_element *elem;
+  channel_data *chand;
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  static const grpc_channel_filter *filters[] = {&lame_filter};
+  channel =
+      grpc_channel_create_from_filters(&exec_ctx, target, filters, 1, NULL, 1);
+  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 == &lame_filter);
+  chand = (channel_data *)elem->channel_data;
+  chand->error_code = error_code;
+  chand->error_message = error_message;
+  grpc_exec_ctx_finish(&exec_ctx);
+  return channel;
+}