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server.cc
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#include "source/server/server.h"
#include <csignal>
#include <cstdint>
#include <ctime>
#include <functional>
#include <memory>
#include <string>
#include "envoy/admin/v3/config_dump.pb.h"
#include "envoy/common/exception.h"
#include "envoy/common/time.h"
#include "envoy/config/bootstrap/v3/bootstrap.pb.h"
#include "envoy/config/bootstrap/v3/bootstrap.pb.validate.h"
#include "envoy/event/dispatcher.h"
#include "envoy/event/signal.h"
#include "envoy/event/timer.h"
#include "envoy/network/dns.h"
#include "envoy/registry/registry.h"
#include "envoy/server/bootstrap_extension_config.h"
#include "envoy/server/instance.h"
#include "envoy/server/options.h"
#include "envoy/stats/histogram.h"
#include "envoy/stats/stats.h"
#include "envoy/upstream/cluster_manager.h"
#include "source/common/api/api_impl.h"
#include "source/common/api/os_sys_calls_impl.h"
#include "source/common/common/enum_to_int.h"
#include "source/common/common/mutex_tracer_impl.h"
#include "source/common/common/utility.h"
#include "source/common/config/utility.h"
#include "source/common/config/well_known_names.h"
#include "source/common/config/xds_resource.h"
#include "source/common/http/codes.h"
#include "source/common/http/headers.h"
#include "source/common/local_info/local_info_impl.h"
#include "source/common/memory/stats.h"
#include "source/common/network/address_impl.h"
#include "source/common/network/dns_resolver/dns_factory_util.h"
#include "source/common/network/socket_interface.h"
#include "source/common/network/socket_interface_impl.h"
#include "source/common/protobuf/utility.h"
#include "source/common/router/rds_impl.h"
#include "source/common/runtime/runtime_impl.h"
#include "source/common/runtime/runtime_keys.h"
#include "source/common/signal/fatal_error_handler.h"
#include "source/common/singleton/manager_impl.h"
#include "source/common/stats/stats_matcher_impl.h"
#include "source/common/stats/thread_local_store.h"
#include "source/common/stats/timespan_impl.h"
#include "source/common/upstream/cluster_manager_impl.h"
#include "source/common/version/version.h"
#include "source/server/configuration_impl.h"
#include "source/server/listener_hooks.h"
#include "source/server/listener_manager_factory.h"
#include "source/server/regex_engine.h"
#include "source/server/ssl_context_manager.h"
#include "source/server/utils.h"
namespace Envoy {
namespace Server {
namespace {
std::unique_ptr<ConnectionHandler> getHandler(Event::Dispatcher& dispatcher) {
auto* factory = Config::Utility::getFactoryByName<ConnectionHandlerFactory>(
"envoy.connection_handler.default");
if (factory) {
return factory->createConnectionHandler(dispatcher, absl::nullopt);
}
ENVOY_LOG_MISC(debug, "Unable to find envoy.connection_handler.default factory");
return nullptr;
}
} // namespace
InstanceBase::InstanceBase(Init::Manager& init_manager, const Options& options,
Event::TimeSystem& time_system, ListenerHooks& hooks,
HotRestart& restarter, Stats::StoreRoot& store,
Thread::BasicLockable& access_log_lock,
Random::RandomGeneratorPtr&& random_generator,
ThreadLocal::Instance& tls, Thread::ThreadFactory& thread_factory,
Filesystem::Instance& file_system,
std::unique_ptr<ProcessContext> process_context,
Buffer::WatermarkFactorySharedPtr watermark_factory)
: init_manager_(init_manager), live_(false), options_(options),
validation_context_(options_.allowUnknownStaticFields(),
!options.rejectUnknownDynamicFields(),
options.ignoreUnknownDynamicFields()),
time_source_(time_system), restarter_(restarter), start_time_(time(nullptr)),
original_start_time_(start_time_), stats_store_(store), thread_local_(tls),
random_generator_(std::move(random_generator)),
api_(new Api::Impl(
thread_factory, store, time_system, file_system, *random_generator_, bootstrap_,
process_context ? ProcessContextOptRef(std::ref(*process_context)) : absl::nullopt,
watermark_factory)),
dispatcher_(api_->allocateDispatcher("main_thread")),
access_log_manager_(options.fileFlushIntervalMsec(), *api_, *dispatcher_, access_log_lock,
store),
singleton_manager_(new Singleton::ManagerImpl(api_->threadFactory())),
handler_(getHandler(*dispatcher_)), worker_factory_(thread_local_, *api_, hooks),
mutex_tracer_(options.mutexTracingEnabled() ? &Envoy::MutexTracerImpl::getOrCreateTracer()
: nullptr),
grpc_context_(store.symbolTable()), http_context_(store.symbolTable()),
router_context_(store.symbolTable()), process_context_(std::move(process_context)),
hooks_(hooks), quic_stat_names_(store.symbolTable()), server_contexts_(*this),
enable_reuse_port_default_(true), stats_flush_in_progress_(false) {}
InstanceBase::~InstanceBase() {
terminate();
// Stop logging to file before all the AccessLogManager and its dependencies are
// destructed to avoid crashing at shutdown.
file_logger_.reset();
// Destruct the ListenerManager explicitly, before InstanceBase's local init_manager_ is
// destructed.
//
// The ListenerManager's DestinationPortsMap contains FilterChainSharedPtrs. There is a rare race
// condition where one of these FilterChains contains an HttpConnectionManager, which contains an
// RdsRouteConfigProvider, which contains an RdsRouteConfigSubscriptionSharedPtr. Since
// RdsRouteConfigSubscription is an Init::Target, ~RdsRouteConfigSubscription triggers a callback
// set at initialization, which goes to unregister it from the top-level InitManager, which has
// already been destructed (use-after-free) causing a segfault.
ENVOY_LOG(debug, "destroying listener manager");
listener_manager_.reset();
ENVOY_LOG(debug, "destroyed listener manager");
dispatcher_->shutdown();
#ifdef ENVOY_PERFETTO
if (tracing_session_ != nullptr) {
// Flush the trace data.
perfetto::TrackEvent::Flush();
// Disable tracing and block until tracing has stopped.
tracing_session_->StopBlocking();
close(tracing_fd_);
}
#endif
}
Upstream::ClusterManager& InstanceBase::clusterManager() {
ASSERT(config_.clusterManager() != nullptr);
return *config_.clusterManager();
}
const Upstream::ClusterManager& InstanceBase::clusterManager() const {
ASSERT(config_.clusterManager() != nullptr);
return *config_.clusterManager();
}
void InstanceBase::drainListeners(OptRef<const Network::ExtraShutdownListenerOptions> options) {
ENVOY_LOG(info, "closing and draining listeners");
listener_manager_->stopListeners(ListenerManager::StopListenersType::All,
options.has_value() ? *options
: Network::ExtraShutdownListenerOptions{});
drain_manager_->startDrainSequence([] {});
}
void InstanceBase::failHealthcheck(bool fail) {
live_.store(!fail);
server_stats_->live_.set(live_.load());
}
MetricSnapshotImpl::MetricSnapshotImpl(Stats::Store& store,
Upstream::ClusterManager& cluster_manager,
TimeSource& time_source) {
store.forEachSinkedCounter(
[this](std::size_t size) {
snapped_counters_.reserve(size);
counters_.reserve(size);
},
[this](Stats::Counter& counter) {
snapped_counters_.push_back(Stats::CounterSharedPtr(&counter));
counters_.push_back({counter.latch(), counter});
});
store.forEachSinkedGauge(
[this](std::size_t size) {
snapped_gauges_.reserve(size);
gauges_.reserve(size);
},
[this](Stats::Gauge& gauge) {
snapped_gauges_.push_back(Stats::GaugeSharedPtr(&gauge));
gauges_.push_back(gauge);
});
store.forEachSinkedHistogram(
[this](std::size_t size) {
snapped_histograms_.reserve(size);
histograms_.reserve(size);
},
[this](Stats::ParentHistogram& histogram) {
snapped_histograms_.push_back(Stats::ParentHistogramSharedPtr(&histogram));
histograms_.push_back(histogram);
});
store.forEachSinkedTextReadout(
[this](std::size_t size) {
snapped_text_readouts_.reserve(size);
text_readouts_.reserve(size);
},
[this](Stats::TextReadout& text_readout) {
snapped_text_readouts_.push_back(Stats::TextReadoutSharedPtr(&text_readout));
text_readouts_.push_back(text_readout);
});
Upstream::HostUtility::forEachHostMetric(
cluster_manager,
[this](Stats::PrimitiveCounterSnapshot&& metric) {
host_counters_.emplace_back(std::move(metric));
},
[this](Stats::PrimitiveGaugeSnapshot&& metric) {
host_gauges_.emplace_back(std::move(metric));
});
snapshot_time_ = time_source.systemTime();
}
void InstanceUtil::flushMetricsToSinks(const std::list<Stats::SinkPtr>& sinks, Stats::Store& store,
Upstream::ClusterManager& cm, TimeSource& time_source) {
// Create a snapshot and flush to all sinks.
// NOTE: Even if there are no sinks, creating the snapshot has the important property that it
// latches all counters on a periodic basis. The hot restart code assumes this is being
// done so this should not be removed.
MetricSnapshotImpl snapshot(store, cm, time_source);
for (const auto& sink : sinks) {
sink->flush(snapshot);
}
}
void InstanceBase::flushStats() {
if (stats_flush_in_progress_) {
ENVOY_LOG(debug, "skipping stats flush as flush is already in progress");
server_stats_->dropped_stat_flushes_.inc();
return;
}
stats_flush_in_progress_ = true;
ENVOY_LOG(debug, "flushing stats");
// If Envoy is not fully initialized, workers will not be started and mergeHistograms
// completion callback is not called immediately. As a result of this server stats will
// not be updated and flushed to stat sinks. So skip mergeHistograms call if workers are
// not started yet.
if (initManager().state() == Init::Manager::State::Initialized) {
// A shutdown initiated before this callback may prevent this from being called as per
// the semantics documented in ThreadLocal's runOnAllThreads method.
stats_store_.mergeHistograms([this]() -> void { flushStatsInternal(); });
} else {
ENVOY_LOG(debug, "Envoy is not fully initialized, skipping histogram merge and flushing stats");
flushStatsInternal();
}
}
void InstanceBase::updateServerStats() {
// mergeParentStatsIfAny() does nothing and returns a struct of 0s if there is no parent.
HotRestart::ServerStatsFromParent parent_stats = restarter_.mergeParentStatsIfAny(stats_store_);
server_stats_->uptime_.set(time(nullptr) - original_start_time_);
server_stats_->memory_allocated_.set(Memory::Stats::totalCurrentlyAllocated() +
parent_stats.parent_memory_allocated_);
server_stats_->memory_heap_size_.set(Memory::Stats::totalCurrentlyReserved());
server_stats_->memory_physical_size_.set(Memory::Stats::totalPhysicalBytes());
server_stats_->parent_connections_.set(parent_stats.parent_connections_);
server_stats_->total_connections_.set(listener_manager_->numConnections() +
parent_stats.parent_connections_);
server_stats_->days_until_first_cert_expiring_.set(
sslContextManager().daysUntilFirstCertExpires().value_or(0));
auto secs_until_ocsp_response_expires =
sslContextManager().secondsUntilFirstOcspResponseExpires();
if (secs_until_ocsp_response_expires) {
server_stats_->seconds_until_first_ocsp_response_expiring_.set(
secs_until_ocsp_response_expires.value());
}
server_stats_->state_.set(
enumToInt(Utility::serverState(initManager().state(), healthCheckFailed())));
server_stats_->stats_recent_lookups_.set(
stats_store_.symbolTable().getRecentLookups([](absl::string_view, uint64_t) {}));
}
void InstanceBase::flushStatsInternal() {
updateServerStats();
auto& stats_config = config_.statsConfig();
InstanceUtil::flushMetricsToSinks(stats_config.sinks(), stats_store_, clusterManager(),
timeSource());
// TODO(ramaraochavali): consider adding different flush interval for histograms.
if (stat_flush_timer_ != nullptr) {
stat_flush_timer_->enableTimer(stats_config.flushInterval());
}
stats_flush_in_progress_ = false;
}
bool InstanceBase::healthCheckFailed() { return !live_.load(); }
ProcessContextOptRef InstanceBase::processContext() {
if (process_context_ == nullptr) {
return absl::nullopt;
}
return *process_context_;
}
namespace {
bool canBeRegisteredAsInlineHeader(const Http::LowerCaseString& header_name) {
// 'set-cookie' cannot currently be registered as an inline header.
if (header_name == Http::Headers::get().SetCookie) {
return false;
}
return true;
}
void registerCustomInlineHeadersFromBootstrap(
const envoy::config::bootstrap::v3::Bootstrap& bootstrap) {
for (const auto& inline_header : bootstrap.inline_headers()) {
const Http::LowerCaseString lower_case_name(inline_header.inline_header_name());
if (!canBeRegisteredAsInlineHeader(lower_case_name)) {
throwEnvoyExceptionOrPanic(fmt::format("Header {} cannot be registered as an inline header.",
inline_header.inline_header_name()));
}
switch (inline_header.inline_header_type()) {
case envoy::config::bootstrap::v3::CustomInlineHeader::REQUEST_HEADER:
Http::CustomInlineHeaderRegistry::registerInlineHeader<
Http::RequestHeaderMap::header_map_type>(lower_case_name);
break;
case envoy::config::bootstrap::v3::CustomInlineHeader::REQUEST_TRAILER:
Http::CustomInlineHeaderRegistry::registerInlineHeader<
Http::RequestTrailerMap::header_map_type>(lower_case_name);
break;
case envoy::config::bootstrap::v3::CustomInlineHeader::RESPONSE_HEADER:
Http::CustomInlineHeaderRegistry::registerInlineHeader<
Http::ResponseHeaderMap::header_map_type>(lower_case_name);
break;
case envoy::config::bootstrap::v3::CustomInlineHeader::RESPONSE_TRAILER:
Http::CustomInlineHeaderRegistry::registerInlineHeader<
Http::ResponseTrailerMap::header_map_type>(lower_case_name);
break;
default:
PANIC("not implemented");
}
}
}
} // namespace
void InstanceUtil::loadBootstrapConfig(envoy::config::bootstrap::v3::Bootstrap& bootstrap,
const Options& options,
ProtobufMessage::ValidationVisitor& validation_visitor,
Api::Api& api) {
const std::string& config_path = options.configPath();
const std::string& config_yaml = options.configYaml();
const envoy::config::bootstrap::v3::Bootstrap& config_proto = options.configProto();
// One of config_path and config_yaml or bootstrap should be specified.
if (config_path.empty() && config_yaml.empty() && config_proto.ByteSizeLong() == 0) {
throwEnvoyExceptionOrPanic(
"At least one of --config-path or --config-yaml or Options::configProto() "
"should be non-empty");
}
if (!config_path.empty()) {
#ifdef ENVOY_ENABLE_YAML
MessageUtil::loadFromFile(config_path, bootstrap, validation_visitor, api);
#else
if (!config_path.empty()) {
throwEnvoyExceptionOrPanic("Cannot load from file with YAML disabled\n");
}
UNREFERENCED_PARAMETER(api);
#endif
}
if (!config_yaml.empty()) {
#ifdef ENVOY_ENABLE_YAML
envoy::config::bootstrap::v3::Bootstrap bootstrap_override;
MessageUtil::loadFromYaml(config_yaml, bootstrap_override, validation_visitor);
// TODO(snowp): The fact that we do a merge here doesn't seem to be covered under test.
bootstrap.MergeFrom(bootstrap_override);
#else
throwEnvoyExceptionOrPanic("Cannot load from YAML with YAML disabled\n");
#endif
}
if (config_proto.ByteSizeLong() != 0) {
bootstrap.MergeFrom(config_proto);
}
MessageUtil::validate(bootstrap, validation_visitor);
}
void InstanceBase::initialize(Network::Address::InstanceConstSharedPtr local_address,
ComponentFactory& component_factory) {
std::function set_up_logger = [&] {
TRY_ASSERT_MAIN_THREAD {
file_logger_ = std::make_unique<Logger::FileSinkDelegate>(
options_.logPath(), access_log_manager_, Logger::Registry::getSink());
}
END_TRY
CATCH(const EnvoyException& e, {
throw EnvoyException(
fmt::format("Failed to open log-file '{}'. e.what(): {}", options_.logPath(), e.what()));
});
};
TRY_ASSERT_MAIN_THREAD {
if (!options_.logPath().empty()) {
set_up_logger();
}
restarter_.initialize(*dispatcher_, *this);
drain_manager_ = component_factory.createDrainManager(*this);
initializeOrThrow(std::move(local_address), component_factory);
}
END_TRY
MULTI_CATCH(
const EnvoyException& e,
{
ENVOY_LOG(critical, "error initializing config '{} {} {}': {}",
options_.configProto().DebugString(), options_.configYaml(),
options_.configPath(), e.what());
terminate();
throw;
},
{
ENVOY_LOG(critical, "error initializing due to unknown exception");
terminate();
throw;
});
}
void InstanceBase::initializeOrThrow(Network::Address::InstanceConstSharedPtr local_address,
ComponentFactory& component_factory) {
ENVOY_LOG(info, "initializing epoch {} (base id={}, hot restart version={})",
options_.restartEpoch(), restarter_.baseId(), restarter_.version());
ENVOY_LOG(info, "statically linked extensions:");
for (const auto& ext : Envoy::Registry::FactoryCategoryRegistry::registeredFactories()) {
ENVOY_LOG(info, " {}: {}", ext.first, absl::StrJoin(ext.second->registeredNames(), ", "));
}
// Handle configuration that needs to take place prior to the main configuration load.
InstanceUtil::loadBootstrapConfig(bootstrap_, options_,
messageValidationContext().staticValidationVisitor(), *api_);
bootstrap_config_update_time_ = time_source_.systemTime();
if (bootstrap_.has_application_log_config()) {
THROW_IF_NOT_OK(
Utility::assertExclusiveLogFormatMethod(options_, bootstrap_.application_log_config()));
THROW_IF_NOT_OK(Utility::maybeSetApplicationLogFormat(bootstrap_.application_log_config()));
}
#ifdef ENVOY_PERFETTO
perfetto::TracingInitArgs args;
// Include in-process events only.
args.backends = perfetto::kInProcessBackend;
perfetto::Tracing::Initialize(args);
perfetto::TrackEvent::Register();
// Prepare a configuration for a new "Perfetto" tracing session.
perfetto::TraceConfig cfg;
// TODO(rojkov): make the tracer configurable with either "Perfetto"'s native
// message or custom one embedded into Bootstrap.
cfg.add_buffers()->set_size_kb(1024);
auto* ds_cfg = cfg.add_data_sources()->mutable_config();
ds_cfg->set_name("track_event");
const std::string pftrace_path =
PROTOBUF_GET_STRING_OR_DEFAULT(bootstrap_, perf_tracing_file_path, "envoy.pftrace");
// Instantiate a new tracing session.
tracing_session_ = perfetto::Tracing::NewTrace();
tracing_fd_ = open(pftrace_path.c_str(), O_RDWR | O_CREAT | O_TRUNC, 0600);
if (tracing_fd_ == -1) {
throwEnvoyExceptionOrPanic(
fmt::format("unable to open tracing file {}: {}", pftrace_path, errorDetails(errno)));
}
// Configure the tracing session.
tracing_session_->Setup(cfg, tracing_fd_);
// Enable tracing and block until tracing has started.
tracing_session_->StartBlocking();
#endif
// Immediate after the bootstrap has been loaded, override the header prefix, if configured to
// do so. This must be set before any other code block references the HeaderValues ConstSingleton.
if (!bootstrap_.header_prefix().empty()) {
// setPrefix has a release assert verifying that setPrefix() is not called after prefix()
ThreadSafeSingleton<Http::PrefixValue>::get().setPrefix(bootstrap_.header_prefix().c_str());
}
// Register Custom O(1) headers from bootstrap.
registerCustomInlineHeadersFromBootstrap(bootstrap_);
ENVOY_LOG(info, "HTTP header map info:");
for (const auto& info : Http::HeaderMapImplUtility::getAllHeaderMapImplInfo()) {
ENVOY_LOG(info, " {}: {} bytes: {}", info.name_, info.size_,
absl::StrJoin(info.registered_headers_, ","));
}
// Initialize the regex engine and inject to singleton.
// Needs to happen before stats store initialization because the stats
// matcher config can include regexes.
regex_engine_ = createRegexEngine(
bootstrap_, messageValidationContext().staticValidationVisitor(), serverFactoryContext());
// Needs to happen as early as possible in the instantiation to preempt the objects that require
// stats.
stats_store_.setTagProducer(Config::Utility::createTagProducer(bootstrap_, options_.statsTags()));
stats_store_.setStatsMatcher(std::make_unique<Stats::StatsMatcherImpl>(
bootstrap_.stats_config(), stats_store_.symbolTable()));
stats_store_.setHistogramSettings(
std::make_unique<Stats::HistogramSettingsImpl>(bootstrap_.stats_config()));
const std::string server_stats_prefix = "server.";
const std::string server_compilation_settings_stats_prefix = "server.compilation_settings";
server_stats_ = std::make_unique<ServerStats>(
ServerStats{ALL_SERVER_STATS(POOL_COUNTER_PREFIX(stats_store_, server_stats_prefix),
POOL_GAUGE_PREFIX(stats_store_, server_stats_prefix),
POOL_HISTOGRAM_PREFIX(stats_store_, server_stats_prefix))});
server_compilation_settings_stats_ =
std::make_unique<CompilationSettings::ServerCompilationSettingsStats>(
CompilationSettings::ServerCompilationSettingsStats{ALL_SERVER_COMPILATION_SETTINGS_STATS(
POOL_COUNTER_PREFIX(stats_store_, server_compilation_settings_stats_prefix),
POOL_GAUGE_PREFIX(stats_store_, server_compilation_settings_stats_prefix),
POOL_HISTOGRAM_PREFIX(stats_store_, server_compilation_settings_stats_prefix))});
validation_context_.setCounters(server_stats_->static_unknown_fields_,
server_stats_->dynamic_unknown_fields_,
server_stats_->wip_protos_);
initialization_timer_ = std::make_unique<Stats::HistogramCompletableTimespanImpl>(
server_stats_->initialization_time_ms_, timeSource());
server_stats_->concurrency_.set(options_.concurrency());
server_stats_->hot_restart_epoch_.set(options_.restartEpoch());
InstanceBase::failHealthcheck(false);
// Check if bootstrap has server version override set, if yes, we should use that as
// 'server.version' stat.
uint64_t version_int;
if (bootstrap_.stats_server_version_override().value() > 0) {
version_int = bootstrap_.stats_server_version_override().value();
} else {
if (!StringUtil::atoull(VersionInfo::revision().substr(0, 6).c_str(), version_int, 16)) {
throwEnvoyExceptionOrPanic("compiled GIT SHA is invalid. Invalid build.");
}
}
server_stats_->version_.set(version_int);
if (VersionInfo::sslFipsCompliant()) {
server_compilation_settings_stats_->fips_mode_.set(1);
} else {
// Set this explicitly so that "used" flag is set so that it can be pushed to stats sinks.
server_compilation_settings_stats_->fips_mode_.set(0);
}
// If user has set user_agent_name in the bootstrap config, use it.
// Default to "envoy" if unset.
if (bootstrap_.node().user_agent_name().empty()) {
bootstrap_.mutable_node()->set_user_agent_name("envoy");
}
// If user has set user_agent_build_version in the bootstrap config, use it.
// Default to the internal server version.
if (!bootstrap_.node().user_agent_build_version().has_version()) {
*bootstrap_.mutable_node()->mutable_user_agent_build_version() = VersionInfo::buildVersion();
}
for (const auto& ext : Envoy::Registry::FactoryCategoryRegistry::registeredFactories()) {
auto registered_types = ext.second->registeredTypes();
for (const auto& name : ext.second->allRegisteredNames()) {
auto* extension = bootstrap_.mutable_node()->add_extensions();
extension->set_name(std::string(name));
extension->set_category(ext.first);
auto const version = ext.second->getFactoryVersion(name);
if (version) {
*extension->mutable_version() = version.value();
}
extension->set_disabled(ext.second->isFactoryDisabled(name));
auto it = registered_types.find(name);
if (it != registered_types.end()) {
std::sort(it->second.begin(), it->second.end());
for (const auto& type_url : it->second) {
extension->add_type_urls(type_url);
}
}
}
}
local_info_ = std::make_unique<LocalInfo::LocalInfoImpl>(
stats().symbolTable(), bootstrap_.node(), bootstrap_.node_context_params(), local_address,
options_.serviceZone(), options_.serviceClusterName(), options_.serviceNodeName());
absl::Status creation_status;
Configuration::InitialImpl initial_config(bootstrap_, creation_status);
THROW_IF_NOT_OK(creation_status);
// Learn original_start_time_ if our parent is still around to inform us of it.
const auto parent_admin_shutdown_response = restarter_.sendParentAdminShutdownRequest();
if (parent_admin_shutdown_response.has_value()) {
original_start_time_ = parent_admin_shutdown_response.value().original_start_time_;
// TODO(soulxu): This is added for switching the reuse port default value as true (#17259).
// It ensures the same default value during the hot restart. This can be removed when
// everyone switches to the new default value.
enable_reuse_port_default_ =
parent_admin_shutdown_response.value().enable_reuse_port_default_ ? true : false;
}
OptRef<Server::ConfigTracker> config_tracker;
#ifdef ENVOY_ADMIN_FUNCTIONALITY
admin_ = std::make_unique<AdminImpl>(initial_config.admin().profilePath(), *this,
initial_config.admin().ignoreGlobalConnLimit());
config_tracker = admin_->getConfigTracker();
#endif
secret_manager_ = std::make_unique<Secret::SecretManagerImpl>(config_tracker);
loadServerFlags(initial_config.flagsPath());
// Initialize the overload manager early so other modules can register for actions.
overload_manager_ = createOverloadManager();
maybeCreateHeapShrinker();
for (const auto& bootstrap_extension : bootstrap_.bootstrap_extensions()) {
auto& factory = Config::Utility::getAndCheckFactory<Configuration::BootstrapExtensionFactory>(
bootstrap_extension);
auto config = Config::Utility::translateAnyToFactoryConfig(
bootstrap_extension.typed_config(), messageValidationContext().staticValidationVisitor(),
factory);
bootstrap_extensions_.push_back(
factory.createBootstrapExtension(*config, serverFactoryContext()));
}
// Register the fatal actions.
{
FatalAction::FatalActionPtrList safe_actions;
FatalAction::FatalActionPtrList unsafe_actions;
for (const auto& action_config : bootstrap_.fatal_actions()) {
auto& factory =
Config::Utility::getAndCheckFactory<Server::Configuration::FatalActionFactory>(
action_config.config());
auto action = factory.createFatalActionFromProto(action_config, this);
if (action->isAsyncSignalSafe()) {
safe_actions.push_back(std::move(action));
} else {
unsafe_actions.push_back(std::move(action));
}
}
Envoy::FatalErrorHandler::registerFatalActions(
std::move(safe_actions), std::move(unsafe_actions), api_->threadFactory());
}
if (!bootstrap_.default_socket_interface().empty()) {
auto& sock_name = bootstrap_.default_socket_interface();
auto sock = const_cast<Network::SocketInterface*>(Network::socketInterface(sock_name));
if (sock != nullptr) {
Network::SocketInterfaceSingleton::clear();
Network::SocketInterfaceSingleton::initialize(sock);
}
}
ListenerManagerFactory* listener_manager_factory = nullptr;
if (bootstrap_.has_listener_manager()) {
listener_manager_factory = Config::Utility::getAndCheckFactory<ListenerManagerFactory>(
bootstrap_.listener_manager(), false);
} else {
listener_manager_factory = &Config::Utility::getAndCheckFactoryByName<ListenerManagerFactory>(
Config::ServerExtensionValues::get().DEFAULT_LISTENER);
}
// Workers get created first so they register for thread local updates.
listener_manager_ = listener_manager_factory->createListenerManager(
*this, nullptr, worker_factory_, bootstrap_.enable_dispatcher_stats(), quic_stat_names_);
// The main thread is also registered for thread local updates so that code that does not care
// whether it runs on the main thread or on workers can still use TLS.
thread_local_.registerThread(*dispatcher_, true);
// We can now initialize stats for threading.
stats_store_.initializeThreading(*dispatcher_, thread_local_);
// It's now safe to start writing stats from the main thread's dispatcher.
if (bootstrap_.enable_dispatcher_stats()) {
dispatcher_->initializeStats(*stats_store_.rootScope(), "server.");
}
// The broad order of initialization from this point on is the following:
// 1. Statically provisioned configuration (bootstrap) are loaded.
// 2. Cluster manager is created and all primary clusters (i.e. with endpoint assignments
// provisioned statically in bootstrap, discovered through DNS or file based CDS) are
// initialized.
// 3. Various services are initialized and configured using the bootstrap config.
// 4. RTDS is initialized using primary clusters. This allows runtime overrides to be fully
// configured before the rest of xDS configuration is provisioned.
// 5. Secondary clusters (with endpoint assignments provisioned by xDS servers) are initialized.
// 6. The rest of the dynamic configuration is provisioned.
//
// Please note: this order requires that RTDS is provisioned using a primary cluster. If RTDS is
// provisioned through ADS then ADS must use primary cluster as well. This invariant is enforced
// during RTDS initialization and invalid configuration will be rejected.
// Runtime gets initialized before the main configuration since during main configuration
// load things may grab a reference to the loader for later use.
runtime_ = component_factory.createRuntime(*this, initial_config);
validation_context_.setRuntime(runtime());
if (!runtime().snapshot().getBoolean("envoy.disallow_global_stats", false)) {
assert_action_registration_ = Assert::addDebugAssertionFailureRecordAction(
[this](const char*) { server_stats_->debug_assertion_failures_.inc(); });
envoy_bug_action_registration_ = Assert::addEnvoyBugFailureRecordAction(
[this](const char*) { server_stats_->envoy_bug_failures_.inc(); });
}
if (initial_config.admin().address()) {
#ifdef ENVOY_ADMIN_FUNCTIONALITY
// Admin instance always be created if admin support is not compiled out.
RELEASE_ASSERT(admin_ != nullptr, "Admin instance should be created but actually not.");
auto typed_admin = dynamic_cast<AdminImpl*>(admin_.get());
RELEASE_ASSERT(typed_admin != nullptr, "Admin implementation is not an AdminImpl.");
initial_config.initAdminAccessLog(bootstrap_, typed_admin->factoryContext());
admin_->startHttpListener(initial_config.admin().accessLogs(), initial_config.admin().address(),
initial_config.admin().socketOptions());
#else
throwEnvoyExceptionOrPanic("Admin address configured but admin support compiled out");
#endif
} else {
ENVOY_LOG(info, "No admin address given, so no admin HTTP server started.");
}
if (admin_) {
config_tracker_entry_ = admin_->getConfigTracker().add(
"bootstrap", [this](const Matchers::StringMatcher&) { return dumpBootstrapConfig(); });
}
if (initial_config.admin().address()) {
admin_->addListenerToHandler(handler_.get());
}
// Once we have runtime we can initialize the SSL context manager.
ssl_context_manager_ = createContextManager("ssl_context_manager", time_source_);
cluster_manager_factory_ = std::make_unique<Upstream::ProdClusterManagerFactory>(
serverFactoryContext(), stats_store_, thread_local_, http_context_,
[this]() -> Network::DnsResolverSharedPtr { return this->getOrCreateDnsResolver(); },
*ssl_context_manager_, *secret_manager_, quic_stat_names_, *this);
// Now the configuration gets parsed. The configuration may start setting
// thread local data per above. See MainImpl::initialize() for why ConfigImpl
// is constructed as part of the InstanceBase and then populated once
// cluster_manager_factory_ is available.
THROW_IF_NOT_OK(config_.initialize(bootstrap_, *this, *cluster_manager_factory_));
// Instruct the listener manager to create the LDS provider if needed. This must be done later
// because various items do not yet exist when the listener manager is created.
if (bootstrap_.dynamic_resources().has_lds_config() ||
!bootstrap_.dynamic_resources().lds_resources_locator().empty()) {
std::unique_ptr<xds::core::v3::ResourceLocator> lds_resources_locator;
if (!bootstrap_.dynamic_resources().lds_resources_locator().empty()) {
lds_resources_locator =
std::make_unique<xds::core::v3::ResourceLocator>(Config::XdsResourceIdentifier::decodeUrl(
bootstrap_.dynamic_resources().lds_resources_locator()));
}
listener_manager_->createLdsApi(bootstrap_.dynamic_resources().lds_config(),
lds_resources_locator.get());
}
// We have to defer RTDS initialization until after the cluster manager is
// instantiated (which in turn relies on runtime...).
runtime().initialize(clusterManager());
clusterManager().setPrimaryClustersInitializedCb(
[this]() { onClusterManagerPrimaryInitializationComplete(); });
auto& stats_config = config_.statsConfig();
for (const Stats::SinkPtr& sink : stats_config.sinks()) {
stats_store_.addSink(*sink);
}
if (!stats_config.flushOnAdmin()) {
// Some of the stat sinks may need dispatcher support so don't flush until the main loop starts.
// Just setup the timer.
stat_flush_timer_ = dispatcher_->createTimer([this]() -> void { flushStats(); });
stat_flush_timer_->enableTimer(stats_config.flushInterval());
}
// Now that we are initialized, notify the bootstrap extensions.
for (auto&& bootstrap_extension : bootstrap_extensions_) {
bootstrap_extension->onServerInitialized();
}
// GuardDog (deadlock detection) object and thread setup before workers are
// started and before our own run() loop runs.
main_thread_guard_dog_ = maybeCreateGuardDog("main_thread");
worker_guard_dog_ = maybeCreateGuardDog("workers");
}
void InstanceBase::onClusterManagerPrimaryInitializationComplete() {
// If RTDS was not configured the `onRuntimeReady` callback is immediately invoked.
runtime().startRtdsSubscriptions([this]() { onRuntimeReady(); });
}
void InstanceBase::onRuntimeReady() {
// Begin initializing secondary clusters after RTDS configuration has been applied.
// Initializing can throw exceptions, so catch these.
TRY_ASSERT_MAIN_THREAD {
THROW_IF_NOT_OK(clusterManager().initializeSecondaryClusters(bootstrap_));
}
END_TRY
CATCH(const EnvoyException& e, {
ENVOY_LOG(warn, "Skipping initialization of secondary cluster: {}", e.what());
shutdown();
});
if (bootstrap_.has_hds_config()) {
const auto& hds_config = bootstrap_.hds_config();
async_client_manager_ = std::make_unique<Grpc::AsyncClientManagerImpl>(
*config_.clusterManager(), thread_local_, time_source_, *api_, grpc_context_.statNames(),
bootstrap_.grpc_async_client_manager_config());
TRY_ASSERT_MAIN_THREAD {
THROW_IF_NOT_OK(Config::Utility::checkTransportVersion(hds_config));
auto factory_or_error = Config::Utility::factoryForGrpcApiConfigSource(
*async_client_manager_, hds_config, *stats_store_.rootScope(), false);
THROW_IF_STATUS_NOT_OK(factory_or_error, throw);
hds_delegate_ = std::make_unique<Upstream::HdsDelegate>(
serverFactoryContext(), *stats_store_.rootScope(),
factory_or_error.value()->createUncachedRawAsyncClient(), stats_store_,
*ssl_context_manager_, info_factory_);
}
END_TRY
CATCH(const EnvoyException& e, {
ENVOY_LOG(warn, "Skipping initialization of HDS cluster: {}", e.what());
shutdown();
});
}
}
void InstanceBase::startWorkers() {
// The callback will be called after workers are started.
listener_manager_->startWorkers(makeOptRefFromPtr(worker_guard_dog_.get()), [this]() {
if (isShutdown()) {
return;
}
initialization_timer_->complete();
// Update server stats as soon as initialization is done.
updateServerStats();
workers_started_ = true;
hooks_.onWorkersStarted();
// At this point we are ready to take traffic and all listening ports are up. Notify our
// parent if applicable that they can stop listening and drain.
restarter_.drainParentListeners();
drain_manager_->startParentShutdownSequence();
});
}
Runtime::LoaderPtr InstanceUtil::createRuntime(Instance& server,
Server::Configuration::Initial& config) {
#ifdef ENVOY_ENABLE_YAML
ENVOY_LOG(info, "runtime: {}", MessageUtil::getYamlStringFromMessage(config.runtime()));
#endif
return std::make_unique<Runtime::LoaderImpl>(
server.dispatcher(), server.threadLocal(), config.runtime(), server.localInfo(),
server.stats(), server.api().randomGenerator(),
server.messageValidationContext().dynamicValidationVisitor(), server.api());
}
void InstanceBase::loadServerFlags(const absl::optional<std::string>& flags_path) {
if (!flags_path) {
return;
}
ENVOY_LOG(info, "server flags path: {}", flags_path.value());
if (api_->fileSystem().fileExists(flags_path.value() + "/drain")) {
ENVOY_LOG(info, "starting server in drain mode");
InstanceBase::failHealthcheck(true);
}
}
RunHelper::RunHelper(Instance& instance, const Options& options, Event::Dispatcher& dispatcher,
Upstream::ClusterManager& cm, AccessLog::AccessLogManager& access_log_manager,
Init::Manager& init_manager, OverloadManager& overload_manager,
std::function<void()> post_init_cb)
: init_watcher_("RunHelper", [&instance, post_init_cb]() {
if (!instance.isShutdown()) {
post_init_cb();
}
}) {
// Setup signals.
// Since signals are not supported on Windows we have an internal definition for `SIGTERM`
// On POSIX it resolves as expected to SIGTERM
// On Windows we use it internally for all the console events that indicate that we should
// terminate the process.
if (options.signalHandlingEnabled()) {
sigterm_ = dispatcher.listenForSignal(ENVOY_SIGTERM, [&instance]() {
ENVOY_LOG(warn, "caught ENVOY_SIGTERM");
instance.shutdown();
});
#ifndef WIN32
sigint_ = dispatcher.listenForSignal(SIGINT, [&instance]() {
ENVOY_LOG(warn, "caught SIGINT");
instance.shutdown();
});
sig_usr_1_ = dispatcher.listenForSignal(SIGUSR1, [&access_log_manager]() {
ENVOY_LOG(info, "caught SIGUSR1. Reopening access logs.");
access_log_manager.reopen();
});
sig_hup_ = dispatcher.listenForSignal(SIGHUP, []() {
ENVOY_LOG(warn, "caught and eating SIGHUP. See documentation for how to hot restart.");
});
#endif
}
// Start overload manager before workers.
overload_manager.start();
// If there is no global limit to the number of active connections, warn on startup.
if (!overload_manager.getThreadLocalOverloadState().isResourceMonitorEnabled(
Server::OverloadProactiveResourceName::GlobalDownstreamMaxConnections) &&
!instance.runtime().snapshot().get(Runtime::Keys::GlobalMaxCxRuntimeKey)) {
ENVOY_LOG(warn, "There is no configured limit to the number of allowed active downstream "
"connections. Configure a "
"limit in `envoy.resource_monitors.downstream_connections` resource monitor.");
}
// Register for cluster manager init notification. We don't start serving worker traffic until
// upstream clusters are initialized which may involve running the event loop. Note however that
// this can fire immediately if all clusters have already initialized. Also note that we need
// to guard against shutdown at two different levels since SIGTERM can come in once the run loop
// starts.
cm.setInitializedCb([&instance, &init_manager, &cm, this]() {
if (instance.isShutdown()) {
return;
}
const auto type_url = Config::getTypeUrl<envoy::config::route::v3::RouteConfiguration>();
// Pause RDS to ensure that we don't send any requests until we've
// subscribed to all the RDS resources. The subscriptions happen in the init callbacks,
// so we pause RDS until we've completed all the callbacks.
Config::ScopedResume maybe_resume_rds;
if (cm.adsMux()) {
maybe_resume_rds = cm.adsMux()->pause(type_url);
}
ENVOY_LOG(info, "all clusters initialized. initializing init manager");
init_manager.initialize(init_watcher_);
// Now that we're execute all the init callbacks we can resume RDS
// as we've subscribed to all the statically defined RDS resources.
// This is done by tearing down the maybe_resume_rds Cleanup object.
});
}
void InstanceBase::run() {
// RunHelper exists primarily to facilitate testing of how we respond to early shutdown during
// startup (see RunHelperTest in server_test.cc).
const auto run_helper = RunHelper(*this, options_, *dispatcher_, clusterManager(),
access_log_manager_, init_manager_, overloadManager(), [this] {
notifyCallbacksForStage(Stage::PostInit);
startWorkers();
});
// Run the main dispatch loop waiting to exit.
ENVOY_LOG(info, "starting main dispatch loop");
WatchDogSharedPtr watchdog;
if (main_thread_guard_dog_) {
watchdog = main_thread_guard_dog_->createWatchDog(api_->threadFactory().currentThreadId(),
"main_thread", *dispatcher_);
}
dispatcher_->post([this] { notifyCallbacksForStage(Stage::Startup); });
dispatcher_->run(Event::Dispatcher::RunType::Block);
ENVOY_LOG(info, "main dispatch loop exited");
if (main_thread_guard_dog_) {
main_thread_guard_dog_->stopWatching(watchdog);
}
watchdog.reset();
terminate();
}
void InstanceBase::terminate() {
if (terminated_) {
return;
}
terminated_ = true;
// Before starting to shutdown anything else, stop slot destruction updates.
thread_local_.shutdownGlobalThreading();
// Before the workers start exiting we should disable stat threading.
stats_store_.shutdownThreading();
// TODO: figure out the correct fix: https://github.com/envoyproxy/envoy/issues/15072.
std::vector<std::string> muxes = {
"envoy.config_mux.new_grpc_mux_factory", "envoy.config_mux.grpc_mux_factory",
"envoy.config_mux.delta_grpc_mux_factory", "envoy.config_mux.sotw_grpc_mux_factory"};
for (const auto& name : muxes) {
auto* factory = Config::Utility::getFactoryByName<Config::MuxFactory>(name);
if (factory) {
factory->shutdownAll();
}
}
if (overload_manager_) {
overload_manager_->stop();
}
// Shutdown all the workers now that the main dispatch loop is done.