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//
//
// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//
#include <grpc/support/port_platform.h>
#include "src/core/lib/surface/init.h"
#include <limits.h>
#include "y_absl/base/thread_annotations.h"
#include <grpc/fork.h>
#include <grpc/grpc.h>
#include <grpc/grpc_security.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include <grpc/support/time.h>
#include "src/core/ext/filters/client_channel/backup_poller.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/channel/channel_stack_builder.h"
#include "src/core/lib/config/core_configuration.h"
#include "src/core/lib/debug/trace.h"
#include "src/core/lib/event_engine/forkable.h"
#include "src/core/lib/event_engine/posix_engine/timer_manager.h"
#include "src/core/lib/experiments/config.h"
#include "src/core/lib/gprpp/fork.h"
#include "src/core/lib/gprpp/sync.h"
#include "src/core/lib/gprpp/thd.h"
#include "src/core/lib/iomgr/exec_ctx.h"
#include "src/core/lib/iomgr/iomgr.h"
#include "src/core/lib/iomgr/timer_manager.h"
#include "src/core/lib/security/authorization/grpc_server_authz_filter.h"
#include "src/core/lib/security/credentials/credentials.h"
#include "src/core/lib/security/security_connector/security_connector.h"
#include "src/core/lib/security/transport/auth_filters.h"
#include "src/core/lib/surface/api_trace.h"
#include "src/core/lib/surface/channel_stack_type.h"
#include "src/core/lib/surface/init_internally.h"
// Remnants of the old plugin system
void grpc_resolver_dns_ares_init(void);
void grpc_resolver_dns_ares_shutdown(void);
#define MAX_PLUGINS 128
static gpr_once g_basic_init = GPR_ONCE_INIT;
static grpc_core::Mutex* g_init_mu;
static int g_initializations Y_ABSL_GUARDED_BY(g_init_mu) = []() {
grpc_core::CoreConfiguration::SetDefaultBuilder(
grpc_core::BuildCoreConfiguration);
return 0;
}();
static grpc_core::CondVar* g_shutting_down_cv;
static bool g_shutting_down Y_ABSL_GUARDED_BY(g_init_mu) = false;
static bool maybe_prepend_client_auth_filter(
grpc_core::ChannelStackBuilder* builder) {
if (builder->channel_args().Contains(GRPC_ARG_SECURITY_CONNECTOR)) {
builder->PrependFilter(&grpc_core::ClientAuthFilter::kFilter);
}
return true;
}
static bool maybe_prepend_server_auth_filter(
grpc_core::ChannelStackBuilder* builder) {
if (builder->channel_args().Contains(GRPC_SERVER_CREDENTIALS_ARG)) {
builder->PrependFilter(&grpc_core::ServerAuthFilter::kFilter);
}
return true;
}
static bool maybe_prepend_grpc_server_authz_filter(
grpc_core::ChannelStackBuilder* builder) {
if (builder->channel_args().GetPointer<grpc_authorization_policy_provider>(
GRPC_ARG_AUTHORIZATION_POLICY_PROVIDER) != nullptr) {
builder->PrependFilter(&grpc_core::GrpcServerAuthzFilter::kFilterVtable);
}
return true;
}
namespace grpc_core {
void RegisterSecurityFilters(CoreConfiguration::Builder* builder) {
// Register the auth client with a priority < INT_MAX to allow the authority
// filter -on which the auth filter depends- to be higher on the channel
// stack.
builder->channel_init()->RegisterStage(GRPC_CLIENT_SUBCHANNEL, INT_MAX - 1,
maybe_prepend_client_auth_filter);
builder->channel_init()->RegisterStage(GRPC_CLIENT_DIRECT_CHANNEL,
INT_MAX - 1,
maybe_prepend_client_auth_filter);
builder->channel_init()->RegisterStage(GRPC_SERVER_CHANNEL, INT_MAX - 1,
maybe_prepend_server_auth_filter);
// Register the GrpcServerAuthzFilter with a priority less than
// server_auth_filter to allow server_auth_filter on which the grpc filter
// depends on to be higher on the channel stack.
builder->channel_init()->RegisterStage(
GRPC_SERVER_CHANNEL, INT_MAX - 2, maybe_prepend_grpc_server_authz_filter);
}
} // namespace grpc_core
static void do_basic_init(void) {
grpc_core::InitInternally = grpc_init;
grpc_core::ShutdownInternally = grpc_shutdown;
grpc_core::IsInitializedInternally = []() {
return grpc_is_initialized() != 0;
};
gpr_log_verbosity_init();
g_init_mu = new grpc_core::Mutex();
g_shutting_down_cv = new grpc_core::CondVar();
gpr_time_init();
grpc_core::PrintExperimentsList();
grpc_core::Fork::GlobalInit();
grpc_event_engine::experimental::RegisterForkHandlers();
grpc_fork_handlers_auto_register();
grpc_tracer_init();
grpc_client_channel_global_init_backup_polling();
}
void grpc_init(void) {
gpr_once_init(&g_basic_init, do_basic_init);
grpc_core::MutexLock lock(g_init_mu);
if (++g_initializations == 1) {
if (g_shutting_down) {
g_shutting_down = false;
g_shutting_down_cv->SignalAll();
}
grpc_iomgr_init();
grpc_resolver_dns_ares_init();
grpc_iomgr_start();
}
GRPC_API_TRACE("grpc_init(void)", 0, ());
}
void grpc_shutdown_internal_locked(void)
Y_ABSL_EXCLUSIVE_LOCKS_REQUIRED(g_init_mu) {
{
grpc_core::ExecCtx exec_ctx(0);
grpc_iomgr_shutdown_background_closure();
grpc_timer_manager_set_threading(false); // shutdown timer_manager thread
grpc_resolver_dns_ares_shutdown();
grpc_iomgr_shutdown();
}
g_shutting_down = false;
g_shutting_down_cv->SignalAll();
}
void grpc_shutdown_internal(void* /*ignored*/) {
GRPC_API_TRACE("grpc_shutdown_internal", 0, ());
grpc_core::MutexLock lock(g_init_mu);
// We have released lock from the shutdown thread and it is possible that
// another grpc_init has been called, and do nothing if that is the case.
if (--g_initializations != 0) {
return;
}
grpc_shutdown_internal_locked();
}
void grpc_shutdown(void) {
GRPC_API_TRACE("grpc_shutdown(void)", 0, ());
grpc_core::MutexLock lock(g_init_mu);
if (--g_initializations == 0) {
grpc_core::ApplicationCallbackExecCtx* acec =
grpc_core::ApplicationCallbackExecCtx::Get();
if (!grpc_iomgr_is_any_background_poller_thread() &&
!grpc_event_engine::experimental::TimerManager::
IsTimerManagerThread() &&
(acec == nullptr ||
(acec->Flags() & GRPC_APP_CALLBACK_EXEC_CTX_FLAG_IS_INTERNAL_THREAD) ==
0) &&
grpc_core::ExecCtx::Get() == nullptr) {
// just run clean-up when this is called on non-executor thread.
gpr_log(GPR_DEBUG, "grpc_shutdown starts clean-up now");
g_shutting_down = true;
grpc_shutdown_internal_locked();
} else {
// spawn a detached thread to do the actual clean up in case we are
// currently in an executor thread.
gpr_log(GPR_DEBUG, "grpc_shutdown spawns clean-up thread");
g_initializations++;
g_shutting_down = true;
grpc_core::Thread cleanup_thread(
"grpc_shutdown", grpc_shutdown_internal, nullptr, nullptr,
grpc_core::Thread::Options().set_joinable(false).set_tracked(false));
cleanup_thread.Start();
}
}
}
void grpc_shutdown_blocking(void) {
GRPC_API_TRACE("grpc_shutdown_blocking(void)", 0, ());
grpc_core::MutexLock lock(g_init_mu);
if (--g_initializations == 0) {
g_shutting_down = true;
grpc_shutdown_internal_locked();
}
}
int grpc_is_initialized(void) {
int r;
gpr_once_init(&g_basic_init, do_basic_init);
grpc_core::MutexLock lock(g_init_mu);
r = g_initializations > 0;
return r;
}
void grpc_maybe_wait_for_async_shutdown(void) {
gpr_once_init(&g_basic_init, do_basic_init);
grpc_core::MutexLock lock(g_init_mu);
while (g_shutting_down) {
g_shutting_down_cv->Wait(g_init_mu);
}
}
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