legacy-libs/grpc/deps/grpc/src/core/lib/surface/channel_ping.cc

   1 /*
   2  *
   3  * Copyright 2015 gRPC authors.
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  *
  17  */
  18
  19 #include <grpc/support/port_platform.h>
  20
  21 #include "src/core/lib/surface/channel.h"
  22
  23 #include <string.h>
  24
  25 #include <grpc/support/alloc.h>
  26 #include <grpc/support/log.h>
  27
  28 #include "src/core/lib/surface/api_trace.h"
  29 #include "src/core/lib/surface/completion_queue.h"
  30
  31 typedef struct {
  32   grpc_closure closure;
  33   void* tag;
  34   grpc_completion_queue* cq;
  35   grpc_cq_completion completion_storage;
  36 } ping_result;
  37
  38 static void ping_destroy(void* arg, grpc_cq_completion* storage) {
  39   gpr_free(arg);
  40 }
  41
  42 static void ping_done(void* arg, grpc_error* error) {
  43   ping_result* pr = static_cast<ping_result*>(arg);
  44   grpc_cq_end_op(pr->cq, pr->tag, GRPC_ERROR_REF(error), ping_destroy, pr,
  45                  &pr->completion_storage);
  46 }
  47
  48 void grpc_channel_ping(grpc_channel* channel, grpc_completion_queue* cq,
  49                        void* tag, void* reserved) {
  50   GRPC_API_TRACE("grpc_channel_ping(channel=%p, cq=%p, tag=%p, reserved=%p)", 4,
  51                  (channel, cq, tag, reserved));
  52   grpc_transport_op* op = grpc_make_transport_op(nullptr);
  53   ping_result* pr = static_cast<ping_result*>(gpr_malloc(sizeof(*pr)));
  54   grpc_channel_element* top_elem =
  55       grpc_channel_stack_element(grpc_channel_get_channel_stack(channel), 0);
  56   grpc_core::ExecCtx exec_ctx;
  57   GPR_ASSERT(reserved == nullptr);
  58   pr->tag = tag;
  59   pr->cq = cq;
  60   GRPC_CLOSURE_INIT(&pr->closure, ping_done, pr, grpc_schedule_on_exec_ctx);
  61   op->send_ping.on_ack = &pr->closure;
  62   op->bind_pollset = grpc_cq_pollset(cq);
  63   GPR_ASSERT(grpc_cq_begin_op(cq, tag));
  64   top_elem->filter->start_transport_op(top_elem, op);
  65 }