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
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 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
custom_close_callback(grpc_custom_socket * socket)61 static void custom_close_callback(grpc_custom_socket* socket) {}
62
on_alarm(void * acp,grpc_error * error)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_tcp_trace.enabled()) {
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
custom_connect_callback(grpc_custom_socket * socket,grpc_error * error)84 static void custom_connect_callback(grpc_custom_socket* socket,
85 grpc_error* error) {
86 grpc_core::ExecCtx exec_ctx;
87 grpc_custom_tcp_connect* connect = socket->connector;
88 int done;
89 grpc_closure* closure = connect->closure;
90 grpc_timer_cancel(&connect->alarm);
91 if (error == GRPC_ERROR_NONE) {
92 *connect->endpoint = custom_tcp_endpoint_create(
93 socket, connect->resource_quota, connect->addr_name);
94 }
95 done = (--connect->refs == 0);
96 if (done) {
97 grpc_core::ExecCtx::Get()->Flush();
98 custom_tcp_connect_cleanup(connect);
99 }
100 GRPC_CLOSURE_SCHED(closure, error);
101 }
102
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)103 static void tcp_connect(grpc_closure* closure, grpc_endpoint** ep,
104 grpc_pollset_set* interested_parties,
105 const grpc_channel_args* channel_args,
106 const grpc_resolved_address* resolved_addr,
107 grpc_millis deadline) {
108 GRPC_CUSTOM_IOMGR_ASSERT_SAME_THREAD();
109 (void)channel_args;
110 (void)interested_parties;
111 grpc_custom_tcp_connect* connect;
112 grpc_resource_quota* resource_quota = grpc_resource_quota_create(nullptr);
113 if (channel_args != nullptr) {
114 for (size_t i = 0; i < channel_args->num_args; i++) {
115 if (0 == strcmp(channel_args->args[i].key, GRPC_ARG_RESOURCE_QUOTA)) {
116 grpc_resource_quota_unref_internal(resource_quota);
117 resource_quota = grpc_resource_quota_ref_internal(
118 (grpc_resource_quota*)channel_args->args[i].value.pointer.p);
119 }
120 }
121 }
122 grpc_custom_socket* socket =
123 (grpc_custom_socket*)gpr_malloc(sizeof(grpc_custom_socket));
124 socket->refs = 2;
125 grpc_custom_socket_vtable->init(socket, GRPC_AF_UNSPEC);
126 connect =
127 (grpc_custom_tcp_connect*)gpr_malloc(sizeof(grpc_custom_tcp_connect));
128 connect->closure = closure;
129 connect->endpoint = ep;
130 connect->addr_name = grpc_sockaddr_to_uri(resolved_addr);
131 connect->resource_quota = resource_quota;
132 connect->socket = socket;
133 socket->connector = connect;
134 socket->endpoint = nullptr;
135 socket->listener = nullptr;
136 connect->refs = 2;
137
138 if (grpc_tcp_trace.enabled()) {
139 gpr_log(GPR_INFO, "CLIENT_CONNECT: %p %s: asynchronously connecting",
140 socket, connect->addr_name);
141 }
142
143 GRPC_CLOSURE_INIT(&connect->on_alarm, on_alarm, socket,
144 grpc_schedule_on_exec_ctx);
145 grpc_timer_init(&connect->alarm, deadline, &connect->on_alarm);
146 grpc_custom_socket_vtable->connect(
147 socket, (const grpc_sockaddr*)resolved_addr->addr, resolved_addr->len,
148 custom_connect_callback);
149 }
150
151 grpc_tcp_client_vtable custom_tcp_client_vtable = {tcp_connect};
152