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 <grpc/grpc.h>
22
23 #include <string.h>
24
25 #include <grpc/support/alloc.h>
26 #include <grpc/support/string_util.h>
27
28 #include "src/core/ext/filters/client_channel/client_channel.h"
29 #include "src/core/ext/filters/client_channel/resolver_registry.h"
30 #include "src/core/ext/transport/chttp2/client/authority.h"
31 #include "src/core/ext/transport/chttp2/client/chttp2_connector.h"
32 #include "src/core/lib/channel/channel_args.h"
33 #include "src/core/lib/surface/api_trace.h"
34 #include "src/core/lib/surface/channel.h"
35
client_channel_factory_ref(grpc_client_channel_factory * cc_factory)36 static void client_channel_factory_ref(
37 grpc_client_channel_factory* cc_factory) {}
38
client_channel_factory_unref(grpc_client_channel_factory * cc_factory)39 static void client_channel_factory_unref(
40 grpc_client_channel_factory* cc_factory) {}
41
client_channel_factory_create_subchannel(grpc_client_channel_factory * cc_factory,const grpc_subchannel_args * args)42 static grpc_subchannel* client_channel_factory_create_subchannel(
43 grpc_client_channel_factory* cc_factory, const grpc_subchannel_args* args) {
44 grpc_subchannel_args final_sc_args;
45 memcpy(&final_sc_args, args, sizeof(*args));
46 final_sc_args.args = grpc_default_authority_add_if_not_present(args->args);
47 grpc_connector* connector = grpc_chttp2_connector_create();
48 grpc_subchannel* s = grpc_subchannel_create(connector, &final_sc_args);
49 grpc_connector_unref(connector);
50 grpc_channel_args_destroy(const_cast<grpc_channel_args*>(final_sc_args.args));
51 return s;
52 }
53
client_channel_factory_create_channel(grpc_client_channel_factory * cc_factory,const char * target,grpc_client_channel_type type,const grpc_channel_args * args)54 static grpc_channel* client_channel_factory_create_channel(
55 grpc_client_channel_factory* cc_factory, const char* target,
56 grpc_client_channel_type type, const grpc_channel_args* args) {
57 if (target == nullptr) {
58 gpr_log(GPR_ERROR, "cannot create channel with NULL target name");
59 return nullptr;
60 }
61 // Add channel arg containing the server URI.
62 grpc_core::UniquePtr<char> canonical_target =
63 grpc_core::ResolverRegistry::AddDefaultPrefixIfNeeded(target);
64 grpc_arg arg = grpc_channel_arg_string_create(
65 const_cast<char*>(GRPC_ARG_SERVER_URI), canonical_target.get());
66 const char* to_remove[] = {GRPC_ARG_SERVER_URI};
67 grpc_channel_args* new_args =
68 grpc_channel_args_copy_and_add_and_remove(args, to_remove, 1, &arg, 1);
69 grpc_channel* channel =
70 grpc_channel_create(target, new_args, GRPC_CLIENT_CHANNEL, nullptr);
71 grpc_channel_args_destroy(new_args);
72 return channel;
73 }
74
75 static const grpc_client_channel_factory_vtable client_channel_factory_vtable =
76 {client_channel_factory_ref, client_channel_factory_unref,
77 client_channel_factory_create_subchannel,
78 client_channel_factory_create_channel};
79
80 static grpc_client_channel_factory client_channel_factory = {
81 &client_channel_factory_vtable};
82
83 /* Create a client channel:
84 Asynchronously: - resolve target
85 - connect to it (trying alternatives as presented)
86 - perform handshakes */
grpc_insecure_channel_create(const char * target,const grpc_channel_args * args,void * reserved)87 grpc_channel* grpc_insecure_channel_create(const char* target,
88 const grpc_channel_args* args,
89 void* reserved) {
90 grpc_core::ExecCtx exec_ctx;
91 GRPC_API_TRACE(
92 "grpc_insecure_channel_create(target=%s, args=%p, reserved=%p)", 3,
93 (target, args, reserved));
94 GPR_ASSERT(reserved == nullptr);
95 // Add channel arg containing the client channel factory.
96 grpc_arg arg =
97 grpc_client_channel_factory_create_channel_arg(&client_channel_factory);
98 grpc_channel_args* new_args = grpc_channel_args_copy_and_add(args, &arg, 1);
99 // Create channel.
100 grpc_channel* channel = client_channel_factory_create_channel(
101 &client_channel_factory, target, GRPC_CLIENT_CHANNEL_TYPE_REGULAR,
102 new_args);
103 // Clean up.
104 grpc_channel_args_destroy(new_args);
105
106 return channel != nullptr ? channel
107 : grpc_lame_client_channel_create(
108 target, GRPC_STATUS_INTERNAL,
109 "Failed to create client channel");
110 }
111