legacy-libs/grpc/deps/grpc/src/core/lib/iomgr/tcp_client_custom.cc

   1 /*
   2  *
   3  * Copyright 2018 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/iomgr/port.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/iomgr/error.h"
  29 #include "src/core/lib/iomgr/iomgr_custom.h"
  30 #include "src/core/lib/iomgr/sockaddr_utils.h"
  31 #include "src/core/lib/iomgr/tcp_client.h"
  32 #include "src/core/lib/iomgr/tcp_custom.h"
  33 #include "src/core/lib/iomgr/timer.h"
  34
  35 extern grpc_core::TraceFlag grpc_tcp_trace;
  36 extern grpc_socket_vtable* grpc_custom_socket_vtable;
  37
  38 struct grpc_custom_tcp_connect {
  39   grpc_custom_socket* socket;
  40   grpc_timer alarm;
  41   grpc_closure on_alarm;
  42   grpc_closure* closure;
  43   grpc_endpoint** endpoint;
  44   int refs;
  45   char* addr_name;
  46   grpc_resource_quota* resource_quota;
  47 };
  48
  49 static void custom_tcp_connect_cleanup(grpc_custom_tcp_connect* connect) {
  50   grpc_custom_socket* socket = connect->socket;
  51   grpc_resource_quota_unref_internal(connect->resource_quota);
  52   gpr_free(connect->addr_name);
  53   gpr_free(connect);
  54   socket->refs--;
  55   if (socket->refs == 0) {
  56     grpc_custom_socket_vtable->destroy(socket);
  57     gpr_free(socket);
  58   }
  59 }
  60
  61 static void custom_close_callback(grpc_custom_socket* socket) {}
  62
  63 static void on_alarm(void* acp, grpc_error* error) {
  64   int done;
  65   grpc_custom_socket* socket = (grpc_custom_socket*)acp;
  66   grpc_custom_tcp_connect* connect = socket->connector;
  67   if (GRPC_TRACE_FLAG_ENABLED(grpc_tcp_trace)) {
  68     const char* str = grpc_error_string(error);
  69     gpr_log(GPR_INFO, "CLIENT_CONNECT: %s: on_alarm: error=%s",
  70             connect->addr_name, str);
  71   }
  72   if (error == GRPC_ERROR_NONE) {
  73     /* error == NONE implies that the timer ran out, and wasn't cancelled. If
  74        it was cancelled, then the handler that cancelled it also should close
  75        the handle, if applicable */
  76     grpc_custom_socket_vtable->close(socket, custom_close_callback);
  77   }
  78   done = (--connect->refs == 0);
  79   if (done) {
  80     custom_tcp_connect_cleanup(connect);
  81   }
  82 }
  83
  84 static void custom_connect_callback_internal(grpc_custom_socket* socket,
  85                                              grpc_error* error) {
  86   grpc_custom_tcp_connect* connect = socket->connector;
  87   int done;
  88   grpc_closure* closure = connect->closure;
  89   grpc_timer_cancel(&connect->alarm);
  90   if (error == GRPC_ERROR_NONE) {
  91     *connect->endpoint = custom_tcp_endpoint_create(
  92         socket, connect->resource_quota, connect->addr_name);
  93   }
  94   done = (--connect->refs == 0);
  95   if (done) {
  96     grpc_core::ExecCtx::Get()->Flush();
  97     custom_tcp_connect_cleanup(connect);
  98   }
  99   GRPC_CLOSURE_SCHED(closure, error);
 100 }
 101
 102 static void custom_connect_callback(grpc_custom_socket* socket,
 103                                     grpc_error* error) {
 104   grpc_core::ApplicationCallbackExecCtx callback_exec_ctx;
 105   if (grpc_core::ExecCtx::Get() == nullptr) {
 106     /* If we are being run on a thread which does not have an exec_ctx created
 107      * yet, we should create one. */
 108     grpc_core::ExecCtx exec_ctx;
 109     custom_connect_callback_internal(socket, error);
 110   } else {
 111     custom_connect_callback_internal(socket, error);
 112   }
 113 }
 114
 115 static void tcp_connect(grpc_closure* closure, grpc_endpoint** ep,
 116                         grpc_pollset_set* interested_parties,
 117                         const grpc_channel_args* channel_args,
 118                         const grpc_resolved_address* resolved_addr,
 119                         grpc_millis deadline) {
 120   GRPC_CUSTOM_IOMGR_ASSERT_SAME_THREAD();
 121   (void)channel_args;
 122   (void)interested_parties;
 123   grpc_custom_tcp_connect* connect;
 124   grpc_resource_quota* resource_quota = grpc_resource_quota_create(nullptr);
 125   if (channel_args != nullptr) {
 126     for (size_t i = 0; i < channel_args->num_args; i++) {
 127       if (0 == strcmp(channel_args->args[i].key, GRPC_ARG_RESOURCE_QUOTA)) {
 128         grpc_resource_quota_unref_internal(resource_quota);
 129         resource_quota = grpc_resource_quota_ref_internal(
 130             (grpc_resource_quota*)channel_args->args[i].value.pointer.p);
 131       }
 132     }
 133   }
 134   grpc_custom_socket* socket =
 135       (grpc_custom_socket*)gpr_malloc(sizeof(grpc_custom_socket));
 136   socket->refs = 2;
 137   grpc_custom_socket_vtable->init(socket, GRPC_AF_UNSPEC);
 138   connect =
 139       (grpc_custom_tcp_connect*)gpr_malloc(sizeof(grpc_custom_tcp_connect));
 140   connect->closure = closure;
 141   connect->endpoint = ep;
 142   connect->addr_name = grpc_sockaddr_to_uri(resolved_addr);
 143   connect->resource_quota = resource_quota;
 144   connect->socket = socket;
 145   socket->connector = connect;
 146   socket->endpoint = nullptr;
 147   socket->listener = nullptr;
 148   connect->refs = 2;
 149
 150   if (GRPC_TRACE_FLAG_ENABLED(grpc_tcp_trace)) {
 151     gpr_log(GPR_INFO, "CLIENT_CONNECT: %p %s: asynchronously connecting",
 152             socket, connect->addr_name);
 153   }
 154
 155   GRPC_CLOSURE_INIT(&connect->on_alarm, on_alarm, socket,
 156                     grpc_schedule_on_exec_ctx);
 157   grpc_timer_init(&connect->alarm, deadline, &connect->on_alarm);
 158   grpc_custom_socket_vtable->connect(
 159       socket, (const grpc_sockaddr*)resolved_addr->addr, resolved_addr->len,
 160       custom_connect_callback);
 161 }
 162
 163 grpc_tcp_client_vtable custom_tcp_client_vtable = {tcp_connect};