3 * Copyright 2015-2016 gRPC authors.
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
9 * http://www.apache.org/licenses/LICENSE-2.0
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.
21 #include <grpc/support/cpu.h>
22 #include <grpc/support/log.h>
23 #include <grpcpp/impl/service_type.h>
24 #include <grpcpp/resource_quota.h>
25 #include <grpcpp/server.h>
26 #include <grpcpp/server_builder.h>
28 #include "src/core/lib/channel/channel_args.h"
29 #include "src/core/lib/gpr/string.h"
30 #include "src/core/lib/gpr/useful.h"
31 #include "src/cpp/server/external_connection_acceptor_impl.h"
32 #include "src/cpp/server/thread_pool_interface.h"
36 static std::vector<std::unique_ptr<ServerBuilderPlugin> (*)()>*
37 g_plugin_factory_list;
38 static gpr_once once_init_plugin_list = GPR_ONCE_INIT;
40 static void do_plugin_list_init(void) {
41 g_plugin_factory_list =
42 new std::vector<std::unique_ptr<ServerBuilderPlugin> (*)()>();
45 ServerBuilder::ServerBuilder()
46 : max_receive_message_size_(INT_MIN),
47 max_send_message_size_(INT_MIN),
48 sync_server_settings_(SyncServerSettings()),
49 resource_quota_(nullptr) {
50 gpr_once_init(&once_init_plugin_list, do_plugin_list_init);
51 for (const auto& value : *g_plugin_factory_list) {
52 plugins_.emplace_back(value());
55 // all compression algorithms enabled by default.
56 enabled_compression_algorithms_bitset_ =
57 (1u << GRPC_COMPRESS_ALGORITHMS_COUNT) - 1;
58 memset(&maybe_default_compression_level_, 0,
59 sizeof(maybe_default_compression_level_));
60 memset(&maybe_default_compression_algorithm_, 0,
61 sizeof(maybe_default_compression_algorithm_));
64 ServerBuilder::~ServerBuilder() {
65 if (resource_quota_ != nullptr) {
66 grpc_resource_quota_unref(resource_quota_);
70 std::unique_ptr<grpc::ServerCompletionQueue> ServerBuilder::AddCompletionQueue(
71 bool is_frequently_polled) {
72 grpc::ServerCompletionQueue* cq = new grpc::ServerCompletionQueue(
74 is_frequently_polled ? GRPC_CQ_DEFAULT_POLLING : GRPC_CQ_NON_LISTENING,
77 return std::unique_ptr<grpc::ServerCompletionQueue>(cq);
80 ServerBuilder& ServerBuilder::RegisterService(Service* service) {
81 services_.emplace_back(new NamedService(service));
85 ServerBuilder& ServerBuilder::RegisterService(const std::string& host,
87 services_.emplace_back(new NamedService(host, service));
91 ServerBuilder& ServerBuilder::RegisterAsyncGenericService(
92 AsyncGenericService* service) {
93 if (generic_service_ || callback_generic_service_) {
95 "Adding multiple generic services is unsupported for now. "
96 "Dropping the service %p",
99 generic_service_ = service;
104 ServerBuilder& ServerBuilder::RegisterCallbackGenericService(
105 CallbackGenericService* service) {
106 if (generic_service_ || callback_generic_service_) {
108 "Adding multiple generic services is unsupported for now. "
109 "Dropping the service %p",
112 callback_generic_service_ = service;
117 ServerBuilder& ServerBuilder::SetContextAllocator(
118 std::unique_ptr<grpc::ContextAllocator> context_allocator) {
119 context_allocator_ = std::move(context_allocator);
123 std::unique_ptr<grpc::experimental::ExternalConnectionAcceptor>
124 ServerBuilder::experimental_type::AddExternalConnectionAcceptor(
125 experimental_type::ExternalConnectionType type,
126 std::shared_ptr<ServerCredentials> creds) {
127 std::string name_prefix("external:");
128 char count_str[GPR_LTOA_MIN_BUFSIZE];
129 gpr_ltoa(static_cast<long>(builder_->acceptors_.size()), count_str);
130 builder_->acceptors_.emplace_back(
131 std::make_shared<grpc::internal::ExternalConnectionAcceptorImpl>(
132 name_prefix.append(count_str), type, creds));
133 return builder_->acceptors_.back()->GetAcceptor();
136 void ServerBuilder::experimental_type::SetAuthorizationPolicyProvider(
137 std::shared_ptr<experimental::AuthorizationPolicyProviderInterface>
139 builder_->authorization_provider_ = std::move(provider);
142 ServerBuilder& ServerBuilder::SetOption(
143 std::unique_ptr<ServerBuilderOption> option) {
144 options_.push_back(std::move(option));
148 ServerBuilder& ServerBuilder::SetSyncServerOption(
149 ServerBuilder::SyncServerOption option, int val) {
152 sync_server_settings_.num_cqs = val;
155 sync_server_settings_.min_pollers = val;
158 sync_server_settings_.max_pollers = val;
160 case CQ_TIMEOUT_MSEC:
161 sync_server_settings_.cq_timeout_msec = val;
167 ServerBuilder& ServerBuilder::SetCompressionAlgorithmSupportStatus(
168 grpc_compression_algorithm algorithm, bool enabled) {
170 GPR_BITSET(&enabled_compression_algorithms_bitset_, algorithm);
172 GPR_BITCLEAR(&enabled_compression_algorithms_bitset_, algorithm);
177 ServerBuilder& ServerBuilder::SetDefaultCompressionLevel(
178 grpc_compression_level level) {
179 maybe_default_compression_level_.is_set = true;
180 maybe_default_compression_level_.level = level;
184 ServerBuilder& ServerBuilder::SetDefaultCompressionAlgorithm(
185 grpc_compression_algorithm algorithm) {
186 maybe_default_compression_algorithm_.is_set = true;
187 maybe_default_compression_algorithm_.algorithm = algorithm;
191 ServerBuilder& ServerBuilder::SetResourceQuota(
192 const grpc::ResourceQuota& resource_quota) {
193 if (resource_quota_ != nullptr) {
194 grpc_resource_quota_unref(resource_quota_);
196 resource_quota_ = resource_quota.c_resource_quota();
197 grpc_resource_quota_ref(resource_quota_);
201 ServerBuilder& ServerBuilder::AddListeningPort(
202 const std::string& addr_uri, std::shared_ptr<ServerCredentials> creds,
203 int* selected_port) {
204 const std::string uri_scheme = "dns:";
205 std::string addr = addr_uri;
206 if (addr_uri.compare(0, uri_scheme.size(), uri_scheme) == 0) {
207 size_t pos = uri_scheme.size();
208 while (addr_uri[pos] == '/') ++pos; // Skip slashes.
209 addr = addr_uri.substr(pos);
211 Port port = {addr, std::move(creds), selected_port};
212 ports_.push_back(port);
216 ChannelArguments ServerBuilder::BuildChannelArgs() {
217 ChannelArguments args;
218 if (max_receive_message_size_ >= -1) {
219 args.SetInt(GRPC_ARG_MAX_RECEIVE_MESSAGE_LENGTH, max_receive_message_size_);
221 if (max_send_message_size_ >= -1) {
222 args.SetInt(GRPC_ARG_MAX_SEND_MESSAGE_LENGTH, max_send_message_size_);
224 for (const auto& option : options_) {
225 option->UpdateArguments(&args);
226 option->UpdatePlugins(&plugins_);
228 args.SetInt(GRPC_COMPRESSION_CHANNEL_ENABLED_ALGORITHMS_BITSET,
229 enabled_compression_algorithms_bitset_);
230 if (maybe_default_compression_level_.is_set) {
231 args.SetInt(GRPC_COMPRESSION_CHANNEL_DEFAULT_LEVEL,
232 maybe_default_compression_level_.level);
234 if (maybe_default_compression_algorithm_.is_set) {
235 args.SetInt(GRPC_COMPRESSION_CHANNEL_DEFAULT_ALGORITHM,
236 maybe_default_compression_algorithm_.algorithm);
238 if (resource_quota_ != nullptr) {
239 args.SetPointerWithVtable(GRPC_ARG_RESOURCE_QUOTA, resource_quota_,
240 grpc_resource_quota_arg_vtable());
242 for (const auto& plugin : plugins_) {
243 plugin->UpdateServerBuilder(this);
244 plugin->UpdateChannelArguments(&args);
246 if (authorization_provider_ != nullptr) {
247 args.SetPointerWithVtable(GRPC_ARG_AUTHORIZATION_POLICY_PROVIDER,
248 authorization_provider_->c_provider(),
249 grpc_authorization_policy_provider_arg_vtable());
254 std::unique_ptr<grpc::Server> ServerBuilder::BuildAndStart() {
255 ChannelArguments args = BuildChannelArgs();
257 // == Determine if the server has any syncrhonous methods ==
258 bool has_sync_methods = false;
259 for (const auto& value : services_) {
260 if (value->service->has_synchronous_methods()) {
261 has_sync_methods = true;
266 if (!has_sync_methods) {
267 for (const auto& value : plugins_) {
268 if (value->has_sync_methods()) {
269 has_sync_methods = true;
275 // If this is a Sync server, i.e a server expositing sync API, then the server
276 // needs to create some completion queues to listen for incoming requests.
277 // 'sync_server_cqs' are those internal completion queues.
279 // This is different from the completion queues added to the server via
280 // ServerBuilder's AddCompletionQueue() method (those completion queues
281 // are in 'cqs_' member variable of ServerBuilder object)
282 std::shared_ptr<std::vector<std::unique_ptr<grpc::ServerCompletionQueue>>>
285 std::vector<std::unique_ptr<grpc::ServerCompletionQueue>>>());
287 bool has_frequently_polled_cqs = false;
288 for (const auto& cq : cqs_) {
289 if (cq->IsFrequentlyPolled()) {
290 has_frequently_polled_cqs = true;
295 // == Determine if the server has any callback methods ==
296 bool has_callback_methods = false;
297 for (const auto& service : services_) {
298 if (service->service->has_callback_methods()) {
299 has_callback_methods = true;
300 has_frequently_polled_cqs = true;
305 if (callback_generic_service_ != nullptr) {
306 has_frequently_polled_cqs = true;
309 const bool is_hybrid_server = has_sync_methods && has_frequently_polled_cqs;
311 if (has_sync_methods) {
312 grpc_cq_polling_type polling_type =
313 is_hybrid_server ? GRPC_CQ_NON_POLLING : GRPC_CQ_DEFAULT_POLLING;
315 // Create completion queues to listen to incoming rpc requests
316 for (int i = 0; i < sync_server_settings_.num_cqs; i++) {
317 sync_server_cqs->emplace_back(
318 new grpc::ServerCompletionQueue(GRPC_CQ_NEXT, polling_type, nullptr));
322 // TODO(vjpai): Add a section here for plugins once they can support callback
325 if (has_sync_methods) {
326 // This is a Sync server
328 "Synchronous server. Num CQs: %d, Min pollers: %d, Max Pollers: "
329 "%d, CQ timeout (msec): %d",
330 sync_server_settings_.num_cqs, sync_server_settings_.min_pollers,
331 sync_server_settings_.max_pollers,
332 sync_server_settings_.cq_timeout_msec);
335 if (has_callback_methods) {
336 gpr_log(GPR_INFO, "Callback server.");
339 std::unique_ptr<grpc::Server> server(new grpc::Server(
340 &args, sync_server_cqs, sync_server_settings_.min_pollers,
341 sync_server_settings_.max_pollers, sync_server_settings_.cq_timeout_msec,
342 std::move(acceptors_), server_config_fetcher_, resource_quota_,
343 std::move(interceptor_creators_)));
345 ServerInitializer* initializer = server->initializer();
347 // Register all the completion queues with the server. i.e
348 // 1. sync_server_cqs: internal completion queues created IF this is a sync
350 // 2. cqs_: Completion queues added via AddCompletionQueue() call
352 for (const auto& cq : *sync_server_cqs) {
353 grpc_server_register_completion_queue(server->server_, cq->cq(), nullptr);
354 has_frequently_polled_cqs = true;
357 if (has_callback_methods || callback_generic_service_ != nullptr) {
358 auto* cq = server->CallbackCQ();
359 grpc_server_register_completion_queue(server->server_, cq->cq(), nullptr);
362 // cqs_ contains the completion queue added by calling the ServerBuilder's
363 // AddCompletionQueue() API. Some of them may not be frequently polled (i.e by
364 // calling Next() or AsyncNext()) and hence are not safe to be used for
365 // listening to incoming channels. Such completion queues must be registered
366 // as non-listening queues. In debug mode, these should have their server list
367 // tracked since these are provided the user and must be Shutdown by the user
368 // after the server is shutdown.
369 for (const auto& cq : cqs_) {
370 grpc_server_register_completion_queue(server->server_, cq->cq(), nullptr);
371 cq->RegisterServer(server.get());
374 if (!has_frequently_polled_cqs) {
376 "At least one of the completion queues must be frequently polled");
380 server->RegisterContextAllocator(std::move(context_allocator_));
382 for (const auto& value : services_) {
383 if (!server->RegisterService(value->host.get(), value->service)) {
388 for (const auto& value : plugins_) {
389 value->InitServer(initializer);
392 if (generic_service_) {
393 server->RegisterAsyncGenericService(generic_service_);
394 } else if (callback_generic_service_) {
395 server->RegisterCallbackGenericService(callback_generic_service_);
397 for (const auto& value : services_) {
398 if (value->service->has_generic_methods()) {
400 "Some methods were marked generic but there is no "
401 "generic service registered.");
407 bool added_port = false;
408 for (auto& port : ports_) {
409 int r = server->AddListeningPort(port.addr, port.creds.get());
411 if (added_port) server->Shutdown();
415 if (port.selected_port != nullptr) {
416 *port.selected_port = r;
420 auto cqs_data = cqs_.empty() ? nullptr : &cqs_[0];
421 server->Start(cqs_data, cqs_.size());
423 for (const auto& value : plugins_) {
424 value->Finish(initializer);
430 void ServerBuilder::InternalAddPluginFactory(
431 std::unique_ptr<ServerBuilderPlugin> (*CreatePlugin)()) {
432 gpr_once_init(&once_init_plugin_list, do_plugin_list_init);
433 (*g_plugin_factory_list).push_back(CreatePlugin);
436 ServerBuilder& ServerBuilder::EnableWorkaround(grpc_workaround_list id) {
438 case GRPC_WORKAROUND_ID_CRONET_COMPRESSION:
439 return AddChannelArgument(GRPC_ARG_WORKAROUND_CRONET_COMPRESSION, 1);
441 gpr_log(GPR_ERROR, "Workaround %u does not exist or is obsolete.", id);