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