aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/cpp/client/channel_cc.cc
blob: f2d9bb07c95fe4d138e7eb336c7b8898bc360a84 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
/*
 *
 * Copyright 2015 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 <grpc++/channel.h>

#include <memory>

#include <grpc++/client_context.h>
#include <grpc++/completion_queue.h>
#include <grpc++/impl/call.h>
#include <grpc++/impl/codegen/completion_queue_tag.h>
#include <grpc++/impl/grpc_library.h>
#include <grpc++/impl/rpc_method.h>
#include <grpc++/security/credentials.h>
#include <grpc++/support/channel_arguments.h>
#include <grpc++/support/config.h>
#include <grpc++/support/status.h>
#include <grpc++/support/time.h>
#include <grpc/grpc.h>
#include <grpc/slice.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include "src/core/lib/profiling/timers.h"

namespace grpc {

static internal::GrpcLibraryInitializer g_gli_initializer;
Channel::Channel(const grpc::string& host, grpc_channel* channel)
    : host_(host), c_channel_(channel) {
  g_gli_initializer.summon();
}

Channel::~Channel() { grpc_channel_destroy(c_channel_); }

namespace {

grpc::string GetChannelInfoField(grpc_channel* channel,
                                 grpc_channel_info* channel_info,
                                 char*** channel_info_field) {
  char* value = NULL;
  memset(channel_info, 0, sizeof(*channel_info));
  *channel_info_field = &value;
  grpc_channel_get_info(channel, channel_info);
  if (value == NULL) return "";
  grpc::string result = value;
  gpr_free(value);
  return result;
}

}  // namespace

grpc::string Channel::GetLoadBalancingPolicyName() const {
  grpc_channel_info channel_info;
  return GetChannelInfoField(c_channel_, &channel_info,
                             &channel_info.lb_policy_name);
}

grpc::string Channel::GetServiceConfigJSON() const {
  grpc_channel_info channel_info;
  return GetChannelInfoField(c_channel_, &channel_info,
                             &channel_info.service_config_json);
}

Call Channel::CreateCall(const RpcMethod& method, ClientContext* context,
                         CompletionQueue* cq) {
  const bool kRegistered = method.channel_tag() && context->authority().empty();
  grpc_call* c_call = NULL;
  if (kRegistered) {
    c_call = grpc_channel_create_registered_call(
        c_channel_, context->propagate_from_call_,
        context->propagation_options_.c_bitmask(), cq->cq(),
        method.channel_tag(), context->raw_deadline(), nullptr);
  } else {
    const char* host_str = NULL;
    if (!context->authority().empty()) {
      host_str = context->authority_.c_str();
    } else if (!host_.empty()) {
      host_str = host_.c_str();
    }
    grpc_slice method_slice = SliceFromCopiedString(method.name());
    grpc_slice host_slice;
    if (host_str != nullptr) {
      host_slice = SliceFromCopiedString(host_str);
    }
    c_call = grpc_channel_create_call(
        c_channel_, context->propagate_from_call_,
        context->propagation_options_.c_bitmask(), cq->cq(), method_slice,
        host_str == nullptr ? nullptr : &host_slice, context->raw_deadline(),
        nullptr);
    grpc_slice_unref(method_slice);
    if (host_str != nullptr) {
      grpc_slice_unref(host_slice);
    }
  }
  grpc_census_call_set_context(c_call, context->census_context());
  context->set_call(c_call, shared_from_this());
  return Call(c_call, this, cq);
}

void Channel::PerformOpsOnCall(CallOpSetInterface* ops, Call* call) {
  static const size_t MAX_OPS = 8;
  size_t nops = 0;
  grpc_op cops[MAX_OPS];
  ops->FillOps(call->call(), cops, &nops);
  GPR_ASSERT(GRPC_CALL_OK ==
             grpc_call_start_batch(call->call(), cops, nops, ops, nullptr));
}

void* Channel::RegisterMethod(const char* method) {
  return grpc_channel_register_call(
      c_channel_, method, host_.empty() ? NULL : host_.c_str(), nullptr);
}

grpc_connectivity_state Channel::GetState(bool try_to_connect) {
  return grpc_channel_check_connectivity_state(c_channel_, try_to_connect);
}

namespace {
class TagSaver final : public CompletionQueueTag {
 public:
  explicit TagSaver(void* tag) : tag_(tag) {}
  ~TagSaver() override {}
  bool FinalizeResult(void** tag, bool* status) override {
    *tag = tag_;
    delete this;
    return true;
  }

 private:
  void* tag_;
};

}  // namespace

void Channel::NotifyOnStateChangeImpl(grpc_connectivity_state last_observed,
                                      gpr_timespec deadline,
                                      CompletionQueue* cq, void* tag) {
  TagSaver* tag_saver = new TagSaver(tag);
  grpc_channel_watch_connectivity_state(c_channel_, last_observed, deadline,
                                        cq->cq(), tag_saver);
}

bool Channel::WaitForStateChangeImpl(grpc_connectivity_state last_observed,
                                     gpr_timespec deadline) {
  CompletionQueue cq;
  bool ok = false;
  void* tag = NULL;
  NotifyOnStateChangeImpl(last_observed, deadline, &cq, NULL);
  cq.Next(&tag, &ok);
  GPR_ASSERT(tag == NULL);
  return ok;
}

}  // namespace grpc