1 //
2 // Copyright 2015 gRPC authors.
3 //
4 // Licensed under the Apache License, Version 2.0 (the "License");
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
7 //
8 // http://www.apache.org/licenses/LICENSE-2.0
9 //
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
15 //
16
17 #include <grpc/support/port_platform.h>
18
19 #include <grpc/grpc.h>
20 #include <grpc/impl/channel_arg_names.h>
21 #include <grpc/support/log.h>
22
23 #include "src/core/lib/channel/channel_args.h"
24 #include "src/core/lib/channel/channelz.h"
25 #include "src/core/lib/config/core_configuration.h"
26 #include "src/core/lib/debug/stats.h"
27 #include "src/core/lib/debug/stats_data.h"
28 #include "src/core/lib/surface/channel.h"
29 #include "src/core/lib/surface/lame_client.h"
30 #include "src/core/lib/surface/legacy_channel.h"
31
32 namespace grpc_core {
33
ChannelCreate(std::string target,ChannelArgs args,grpc_channel_stack_type channel_stack_type,Transport * optional_transport)34 absl::StatusOr<OrphanablePtr<Channel>> ChannelCreate(
35 std::string target, ChannelArgs args,
36 grpc_channel_stack_type channel_stack_type, Transport* optional_transport) {
37 global_stats().IncrementClientChannelsCreated();
38 // For client channels, canonify target string and add channel arg.
39 // Note: We don't do this for direct channels or lame channels.
40 if (channel_stack_type == GRPC_CLIENT_CHANNEL) {
41 target =
42 CoreConfiguration::Get().resolver_registry().AddDefaultPrefixIfNeeded(
43 target);
44 args = args.Set(GRPC_ARG_SERVER_URI, target);
45 }
46 // Set default authority if needed.
47 if (!args.GetString(GRPC_ARG_DEFAULT_AUTHORITY).has_value()) {
48 auto ssl_override = args.GetString(GRPC_SSL_TARGET_NAME_OVERRIDE_ARG);
49 if (ssl_override.has_value()) {
50 args = args.Set(GRPC_ARG_DEFAULT_AUTHORITY,
51 std::string(ssl_override.value()));
52 }
53 }
54 // Check whether channelz is enabled.
55 if (args.GetBool(GRPC_ARG_ENABLE_CHANNELZ)
56 .value_or(GRPC_ENABLE_CHANNELZ_DEFAULT)) {
57 // Get parameters needed to create the channelz node.
58 const size_t channel_tracer_max_memory = std::max(
59 0, args.GetInt(GRPC_ARG_MAX_CHANNEL_TRACE_EVENT_MEMORY_PER_NODE)
60 .value_or(GRPC_MAX_CHANNEL_TRACE_EVENT_MEMORY_PER_NODE_DEFAULT));
61 const bool is_internal_channel =
62 args.GetBool(GRPC_ARG_CHANNELZ_IS_INTERNAL_CHANNEL).value_or(false);
63 // Create the channelz node.
64 std::string channelz_node_target{target.empty() ? "unknown" : target};
65 auto channelz_node = MakeRefCounted<channelz::ChannelNode>(
66 channelz_node_target, channel_tracer_max_memory, is_internal_channel);
67 channelz_node->AddTraceEvent(
68 channelz::ChannelTrace::Severity::Info,
69 grpc_slice_from_static_string("Channel created"));
70 // Add channelz node to channel args.
71 // We remove the is_internal_channel arg, since we no longer need it.
72 args = args.Remove(GRPC_ARG_CHANNELZ_IS_INTERNAL_CHANNEL)
73 .SetObject(std::move(channelz_node));
74 }
75 // Add transport to args.
76 if (optional_transport != nullptr) {
77 args = args.SetObject(optional_transport);
78 }
79 // Delegate to legacy channel impl.
80 return LegacyChannel::Create(std::move(target), std::move(args),
81 channel_stack_type);
82 }
83
84 } // namespace grpc_core
85
grpc_lame_client_channel_create(const char * target,grpc_status_code error_code,const char * error_message)86 grpc_channel* grpc_lame_client_channel_create(const char* target,
87 grpc_status_code error_code,
88 const char* error_message) {
89 grpc_core::ExecCtx exec_ctx;
90 GRPC_API_TRACE(
91 "grpc_lame_client_channel_create(target=%s, error_code=%d, "
92 "error_message=%s)",
93 3, (target, (int)error_code, error_message));
94 if (error_code == GRPC_STATUS_OK) error_code = GRPC_STATUS_UNKNOWN;
95 grpc_core::ChannelArgs args =
96 grpc_core::CoreConfiguration::Get()
97 .channel_args_preconditioning()
98 .PreconditionChannelArgs(nullptr)
99 .Set(GRPC_ARG_LAME_FILTER_ERROR,
100 grpc_core::ChannelArgs::Pointer(
101 new absl::Status(static_cast<absl::StatusCode>(error_code),
102 error_message),
103 &grpc_core::kLameFilterErrorArgVtable));
104 auto channel =
105 grpc_core::ChannelCreate(target == nullptr ? "" : target, std::move(args),
106 GRPC_CLIENT_LAME_CHANNEL, nullptr);
107 GPR_ASSERT(channel.ok());
108 return channel->release()->c_ptr();
109 }
110