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overload_manager_impl_test.cc
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#include <chrono>
#include <initializer_list>
#include "envoy/config/overload/v3/overload.pb.h"
#include "envoy/event/scaled_range_timer_manager.h"
#include "envoy/server/overload/overload_manager.h"
#include "envoy/server/overload/thread_local_overload_state.h"
#include "envoy/server/resource_monitor.h"
#include "envoy/server/resource_monitor_config.h"
#include "source/common/stats/isolated_store_impl.h"
#include "source/extensions/resource_monitors/common/factory_base.h"
#include "source/server/overload_manager_impl.h"
#include "test/common/stats/stat_test_utility.h"
#include "test/mocks/event/mocks.h"
#include "test/mocks/protobuf/mocks.h"
#include "test/mocks/server/options.h"
#include "test/mocks/thread_local/mocks.h"
#include "test/test_common/registry.h"
#include "test/test_common/simulated_time_system.h"
#include "test/test_common/test_runtime.h"
#include "test/test_common/utility.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
using testing::_;
using testing::AllOf;
using testing::AnyNumber;
using testing::ByMove;
using testing::DoAll;
using testing::FloatNear;
using testing::Invoke;
using testing::NiceMock;
using testing::Pointee;
using testing::Property;
using testing::Return;
using testing::SaveArg;
using testing::UnorderedElementsAreArray;
namespace Envoy {
namespace Server {
namespace {
using TimerType = Event::ScaledTimerType;
class FakeResourceMonitor : public ResourceMonitor {
public:
FakeResourceMonitor(Event::Dispatcher& dispatcher) : dispatcher_(dispatcher), response_(0.0) {}
void setPressure(double pressure) { response_ = pressure; }
void setError() { response_ = EnvoyException("fake_error"); }
void setUpdateAsync(bool new_update_async) {
callbacks_.reset();
update_async_ = new_update_async;
}
void updateResourceUsage(ResourceUpdateCallbacks& callbacks) override {
if (update_async_) {
callbacks_.emplace(callbacks);
} else {
publishUpdate(callbacks);
}
}
void publishUpdate() {
if (update_async_) {
ASSERT(callbacks_.has_value());
publishUpdate(*callbacks_);
callbacks_.reset();
}
}
private:
void publishUpdate(ResourceUpdateCallbacks& callbacks) {
if (absl::holds_alternative<double>(response_)) {
Server::ResourceUsage usage;
usage.resource_pressure_ = absl::get<double>(response_);
dispatcher_.post([&, usage]() { callbacks.onSuccess(usage); });
} else {
EnvoyException& error = absl::get<EnvoyException>(response_);
dispatcher_.post([&, error]() { callbacks.onFailure(error); });
}
}
Event::Dispatcher& dispatcher_;
absl::variant<double, EnvoyException> response_;
bool update_async_ = false;
absl::optional<std::reference_wrapper<ResourceUpdateCallbacks>> callbacks_;
};
class FakeProactiveResourceMonitor : public ProactiveResourceMonitor {
public:
FakeProactiveResourceMonitor(uint64_t max) : max_(max), current_(0){};
bool tryAllocateResource(int64_t increment) override {
int64_t new_val = (current_ += increment);
if (new_val > static_cast<int64_t>(max_) || new_val < 0) {
current_ -= increment;
return false;
}
return true;
}
bool tryDeallocateResource(int64_t decrement) override {
RELEASE_ASSERT(decrement <= current_,
"Cannot deallocate resource, current resource usage is lower than decrement");
int64_t new_val = (current_ -= decrement);
if (new_val < 0) {
current_ += decrement;
return false;
}
return true;
}
int64_t currentResourceUsage() const override { return current_.load(); }
int64_t maxResourceUsage() const override { return max_; }
private:
int64_t max_;
std::atomic<int64_t> current_;
};
template <class ConfigType>
class FakeResourceMonitorFactory : public Server::Configuration::ResourceMonitorFactory {
public:
FakeResourceMonitorFactory(const std::string& name) : name_(name) {}
Server::ResourceMonitorPtr
createResourceMonitor(const Protobuf::Message&,
Server::Configuration::ResourceMonitorFactoryContext& context) override {
auto monitor = std::make_unique<FakeResourceMonitor>(context.mainThreadDispatcher());
monitor_ = monitor.get();
return monitor;
}
ProtobufTypes::MessagePtr createEmptyConfigProto() override {
return ProtobufTypes::MessagePtr{new ConfigType()};
}
std::string name() const override { return name_; }
FakeResourceMonitor* monitor_{nullptr}; // not owned
const std::string name_;
};
template <class ConfigType>
class FakeProactiveResourceMonitorFactory
: public Server::Configuration::ProactiveResourceMonitorFactory {
public:
FakeProactiveResourceMonitorFactory(const std::string& name) : name_(name) {}
Server::ProactiveResourceMonitorPtr
createProactiveResourceMonitor(const Protobuf::Message&,
Server::Configuration::ResourceMonitorFactoryContext&) override {
auto monitor = std::make_unique<FakeProactiveResourceMonitor>(3);
monitor_ = monitor.get();
return monitor;
}
ProtobufTypes::MessagePtr createEmptyConfigProto() override {
return ProtobufTypes::MessagePtr{new ConfigType()};
}
std::string name() const override { return name_; }
FakeProactiveResourceMonitor* monitor_{nullptr}; // not owned
const std::string name_;
};
class TestOverloadManager : public OverloadManagerImpl {
public:
TestOverloadManager(Event::Dispatcher& dispatcher, Stats::Scope& stats_scope,
ThreadLocal::SlotAllocator& slot_allocator,
const envoy::config::overload::v3::OverloadManager& config,
ProtobufMessage::ValidationVisitor& validation_visitor, Api::Api& api,
const Server::MockOptions& options)
: OverloadManagerImpl(dispatcher, stats_scope, slot_allocator, config, validation_visitor,
api, options) {
EXPECT_CALL(*this, createScaledRangeTimerManager)
.Times(AnyNumber())
.WillRepeatedly(Invoke(this, &TestOverloadManager::createDefaultScaledRangeTimerManager));
}
MOCK_METHOD(Event::ScaledRangeTimerManagerPtr, createScaledRangeTimerManager,
(Event::Dispatcher&, const Event::ScaledTimerTypeMapConstSharedPtr&),
(const, override));
private:
Event::ScaledRangeTimerManagerPtr createDefaultScaledRangeTimerManager(
Event::Dispatcher& dispatcher,
const Event::ScaledTimerTypeMapConstSharedPtr& timer_minimums) const {
return OverloadManagerImpl::createScaledRangeTimerManager(dispatcher, timer_minimums);
}
};
class OverloadManagerImplTest : public testing::Test {
protected:
OverloadManagerImplTest()
: factory1_("envoy.resource_monitors.fake_resource1"),
factory2_("envoy.resource_monitors.fake_resource2"),
factory3_("envoy.resource_monitors.fake_resource3"),
factory4_("envoy.resource_monitors.fake_resource4"),
factory5_("envoy.resource_monitors.global_downstream_max_connections"),
register_factory1_(factory1_), register_factory2_(factory2_), register_factory3_(factory3_),
register_factory4_(factory4_), register_factory5_(factory5_),
api_(Api::createApiForTest(stats_)) {
scoped_runtime_.mergeValues(
{{"envoy.reloadable_features.no_extension_lookup_by_name", "false"}});
}
void setDispatcherExpectation() {
timer_ = new NiceMock<Event::MockTimer>();
EXPECT_CALL(dispatcher_, createTimer_(_)).WillOnce(Invoke([&](Event::TimerCb cb) {
timer_cb_ = cb;
return timer_;
}));
}
envoy::config::overload::v3::OverloadManager parseConfig(const std::string& config) {
envoy::config::overload::v3::OverloadManager proto;
TestUtility::loadFromYaml(config, proto);
return proto;
}
std::unique_ptr<TestOverloadManager> createOverloadManager(const std::string& config) {
return std::make_unique<TestOverloadManager>(dispatcher_, *stats_.rootScope(), thread_local_,
parseConfig(config), validation_visitor_, *api_,
options_);
}
FakeResourceMonitorFactory<Envoy::ProtobufWkt::Struct> factory1_;
FakeResourceMonitorFactory<Envoy::ProtobufWkt::Timestamp> factory2_;
FakeResourceMonitorFactory<Envoy::ProtobufWkt::Duration> factory3_;
FakeResourceMonitorFactory<Envoy::ProtobufWkt::StringValue> factory4_;
FakeProactiveResourceMonitorFactory<Envoy::ProtobufWkt::Timestamp> factory5_;
Registry::InjectFactory<Configuration::ResourceMonitorFactory> register_factory1_;
Registry::InjectFactory<Configuration::ResourceMonitorFactory> register_factory2_;
Registry::InjectFactory<Configuration::ResourceMonitorFactory> register_factory3_;
Registry::InjectFactory<Configuration::ResourceMonitorFactory> register_factory4_;
Registry::InjectFactory<Configuration::ProactiveResourceMonitorFactory> register_factory5_;
NiceMock<Event::MockDispatcher> dispatcher_;
NiceMock<Event::MockTimer>* timer_; // not owned
Stats::TestUtil::TestStore stats_;
NiceMock<ThreadLocal::MockInstance> thread_local_;
Event::TimerCb timer_cb_;
NiceMock<ProtobufMessage::MockValidationVisitor> validation_visitor_;
Api::ApiPtr api_;
Server::MockOptions options_;
TestScopedRuntime scoped_runtime_;
};
constexpr char kRegularStateConfig[] = R"YAML(
refresh_interval:
seconds: 1
resource_monitors:
- name: envoy.resource_monitors.fake_resource1
- name: envoy.resource_monitors.fake_resource2
- name: envoy.resource_monitors.fake_resource3
- name: envoy.resource_monitors.fake_resource4
actions:
- name: envoy.overload_actions.stop_accepting_requests
triggers:
- name: envoy.resource_monitors.fake_resource1
threshold:
value: 0.9
- name: envoy.resource_monitors.fake_resource2
threshold:
value: 0.8
- name: envoy.resource_monitors.fake_resource3
scaled:
scaling_threshold: 0.5
saturation_threshold: 0.8
- name: envoy.resource_monitors.fake_resource4
scaled:
scaling_threshold: 0.5
saturation_threshold: 0.8
)YAML";
constexpr char proactiveResourceConfig[] = R"YAML(
refresh_interval:
seconds: 1
resource_monitors:
- name: envoy.resource_monitors.fake_resource1
- name: envoy.resource_monitors.global_downstream_max_connections
actions:
- name: envoy.overload_actions.shrink_heap
triggers:
- name: envoy.resource_monitors.fake_resource1
threshold:
value: 0.9
)YAML";
TEST_F(OverloadManagerImplTest, CallbackOnlyFiresWhenStateChanges) {
setDispatcherExpectation();
auto manager(createOverloadManager(kRegularStateConfig));
bool is_active = false;
int cb_count = 0;
manager->registerForAction("envoy.overload_actions.stop_accepting_requests", dispatcher_,
[&](OverloadActionState state) {
is_active = state.isSaturated();
cb_count++;
});
// This overload action callback should never be fired as the action is
// unknown and unconfigured to a trigger.
manager->registerForAction("envoy.overload_actions.unknown_action", dispatcher_,
[&](OverloadActionState) { EXPECT_TRUE(false); });
manager->start();
EXPECT_FALSE(manager->getThreadLocalOverloadState().isResourceMonitorEnabled(
OverloadProactiveResourceName::GlobalDownstreamMaxConnections));
Stats::Gauge& active_gauge =
stats_.gauge("overload.envoy.overload_actions.stop_accepting_requests.active",
Stats::Gauge::ImportMode::Accumulate);
Stats::Gauge& scale_percent_gauge =
stats_.gauge("overload.envoy.overload_actions.stop_accepting_requests.scale_percent",
Stats::Gauge::ImportMode::Accumulate);
Stats::Gauge& pressure_gauge1 =
stats_.gauge("overload.envoy.resource_monitors.fake_resource1.pressure",
Stats::Gauge::ImportMode::NeverImport);
Stats::Gauge& pressure_gauge2 =
stats_.gauge("overload.envoy.resource_monitors.fake_resource2.pressure",
Stats::Gauge::ImportMode::NeverImport);
const OverloadActionState& action_state = manager->getThreadLocalOverloadState().getState(
"envoy.overload_actions.stop_accepting_requests");
// Update does not exceed fake_resource1 trigger threshold, no callback expected
factory1_.monitor_->setPressure(0.5);
timer_cb_();
EXPECT_FALSE(is_active);
EXPECT_THAT(action_state, AllOf(Property(&OverloadActionState::isSaturated, false),
Property(&OverloadActionState::value, UnitFloat::min())));
EXPECT_EQ(0, cb_count);
EXPECT_EQ(0, active_gauge.value());
EXPECT_EQ(0, scale_percent_gauge.value());
EXPECT_EQ(50, pressure_gauge1.value());
// Update exceeds fake_resource1 trigger threshold, callback is expected
factory1_.monitor_->setPressure(0.95);
timer_cb_();
EXPECT_TRUE(is_active);
EXPECT_TRUE(action_state.isSaturated());
EXPECT_EQ(1, cb_count);
EXPECT_EQ(1, active_gauge.value());
EXPECT_EQ(100, scale_percent_gauge.value());
EXPECT_EQ(95, pressure_gauge1.value());
// Callback should not be invoked if action state does not change
factory1_.monitor_->setPressure(0.94);
timer_cb_();
EXPECT_TRUE(is_active);
EXPECT_TRUE(action_state.isSaturated());
EXPECT_EQ(1, cb_count);
EXPECT_EQ(94, pressure_gauge1.value());
// The action is already active for fake_resource1 so no callback expected
factory2_.monitor_->setPressure(0.9);
timer_cb_();
EXPECT_TRUE(is_active);
EXPECT_TRUE(action_state.isSaturated());
EXPECT_EQ(1, cb_count);
EXPECT_EQ(90, pressure_gauge2.value());
// The action remains active for fake_resource2 so no callback expected
factory1_.monitor_->setPressure(0.5);
timer_cb_();
EXPECT_TRUE(is_active);
EXPECT_TRUE(action_state.isSaturated());
EXPECT_EQ(1, cb_count);
EXPECT_EQ(50, pressure_gauge1.value());
EXPECT_EQ(90, pressure_gauge2.value());
// Both become inactive so callback is expected
factory2_.monitor_->setPressure(0.3);
timer_cb_();
EXPECT_FALSE(is_active);
EXPECT_THAT(action_state, AllOf(Property(&OverloadActionState::isSaturated, false),
Property(&OverloadActionState::value, UnitFloat::min())));
EXPECT_EQ(2, cb_count);
EXPECT_EQ(30, pressure_gauge2.value());
// Different triggers, both become active, only one callback expected
factory1_.monitor_->setPressure(0.97);
factory2_.monitor_->setPressure(0.96);
timer_cb_();
EXPECT_TRUE(is_active);
EXPECT_TRUE(action_state.isSaturated());
EXPECT_EQ(3, cb_count);
EXPECT_EQ(97, pressure_gauge1.value());
EXPECT_EQ(96, pressure_gauge2.value());
// Different triggers, both become inactive, only one callback expected
factory1_.monitor_->setPressure(0.41);
factory2_.monitor_->setPressure(0.42);
timer_cb_();
EXPECT_FALSE(is_active);
EXPECT_THAT(action_state, AllOf(Property(&OverloadActionState::isSaturated, false),
Property(&OverloadActionState::value, UnitFloat::min())));
EXPECT_EQ(4, cb_count);
EXPECT_EQ(41, pressure_gauge1.value());
EXPECT_EQ(42, pressure_gauge2.value());
manager->stop();
}
TEST_F(OverloadManagerImplTest, ScaledTrigger) {
setDispatcherExpectation();
auto manager(createOverloadManager(kRegularStateConfig));
manager->start();
const auto& action_state = manager->getThreadLocalOverloadState().getState(
"envoy.overload_actions.stop_accepting_requests");
Stats::Gauge& active_gauge =
stats_.gauge("overload.envoy.overload_actions.stop_accepting_requests.active",
Stats::Gauge::ImportMode::Accumulate);
Stats::Gauge& scale_percent_gauge =
stats_.gauge("overload.envoy.overload_actions.stop_accepting_requests.scale_percent",
Stats::Gauge::ImportMode::Accumulate);
factory3_.monitor_->setPressure(0.5);
timer_cb_();
EXPECT_THAT(action_state, AllOf(Property(&OverloadActionState::isSaturated, false),
Property(&OverloadActionState::value, UnitFloat::min())));
EXPECT_EQ(0, active_gauge.value());
EXPECT_EQ(0, scale_percent_gauge.value());
// The trigger for fake_resource3 is a scaled trigger with a min of 0.5 and a max of 0.8. Set
// the current pressure value to halfway in that range.
factory3_.monitor_->setPressure(0.65);
timer_cb_();
EXPECT_EQ(action_state.value(), UnitFloat(0.5) /* = 0.65 / (0.8 - 0.5) */);
EXPECT_EQ(0, active_gauge.value());
EXPECT_EQ(50, scale_percent_gauge.value());
factory3_.monitor_->setPressure(0.8);
timer_cb_();
EXPECT_TRUE(action_state.isSaturated());
EXPECT_EQ(1, active_gauge.value());
EXPECT_EQ(100, scale_percent_gauge.value());
factory3_.monitor_->setPressure(0.9);
timer_cb_();
EXPECT_TRUE(action_state.isSaturated());
EXPECT_EQ(1, active_gauge.value());
EXPECT_EQ(100, scale_percent_gauge.value());
}
TEST_F(OverloadManagerImplTest, FailedUpdates) {
setDispatcherExpectation();
auto manager(createOverloadManager(kRegularStateConfig));
manager->start();
Stats::Counter& failed_updates =
stats_.counter("overload.envoy.resource_monitors.fake_resource1.failed_updates");
factory1_.monitor_->setError();
timer_cb_();
EXPECT_EQ(1, failed_updates.value());
timer_cb_();
EXPECT_EQ(2, failed_updates.value());
manager->stop();
}
TEST_F(OverloadManagerImplTest, AggregatesMultipleResourceUpdates) {
setDispatcherExpectation();
auto manager(createOverloadManager(kRegularStateConfig));
manager->start();
const OverloadActionState& action_state = manager->getThreadLocalOverloadState().getState(
"envoy.overload_actions.stop_accepting_requests");
factory1_.monitor_->setUpdateAsync(true);
// Monitor 2 will respond immediately at the timer callback, but that won't push an update to
// the thread-local state because monitor 1 hasn't finished its update yet.
factory2_.monitor_->setPressure(1.0);
timer_cb_();
EXPECT_FALSE(action_state.isSaturated());
// Once the last monitor publishes, the change to the action takes effect.
factory1_.monitor_->publishUpdate();
EXPECT_TRUE(action_state.isSaturated());
}
TEST_F(OverloadManagerImplTest, DelayedUpdatesAreCoalesced) {
setDispatcherExpectation();
auto manager(createOverloadManager(kRegularStateConfig));
manager->start();
const OverloadActionState& action_state = manager->getThreadLocalOverloadState().getState(
"envoy.overload_actions.stop_accepting_requests");
factory3_.monitor_->setUpdateAsync(true);
factory4_.monitor_->setUpdateAsync(true);
timer_cb_();
// When monitor 3 publishes its update, the action won't be visible to the thread-local state
factory3_.monitor_->setPressure(0.6);
factory3_.monitor_->publishUpdate();
EXPECT_EQ(action_state.value(), UnitFloat::min());
// Now when monitor 4 publishes a larger value, the update from monitor 3 is skipped.
EXPECT_FALSE(action_state.isSaturated());
factory4_.monitor_->setPressure(0.65);
factory4_.monitor_->publishUpdate();
EXPECT_EQ(action_state.value(), UnitFloat(0.5) /* = (0.65 - 0.5) / (0.8 - 0.5) */);
}
TEST_F(OverloadManagerImplTest, FlushesUpdatesEvenWithOneUnresponsive) {
setDispatcherExpectation();
auto manager(createOverloadManager(kRegularStateConfig));
manager->start();
const OverloadActionState& action_state = manager->getThreadLocalOverloadState().getState(
"envoy.overload_actions.stop_accepting_requests");
// Set monitor 1 to async, but never publish updates for it.
factory1_.monitor_->setUpdateAsync(true);
// Monitor 2 will respond immediately at the timer callback, but that won't push an update to
// the thread-local state because monitor 1 hasn't finished its update yet.
factory2_.monitor_->setPressure(1.0);
timer_cb_();
EXPECT_FALSE(action_state.isSaturated());
// A second timer callback will flush the update from monitor 2, even though monitor 1 is
// unresponsive.
timer_cb_();
EXPECT_TRUE(action_state.isSaturated());
}
TEST_F(OverloadManagerImplTest, SkippedUpdates) {
setDispatcherExpectation();
auto manager(createOverloadManager(kRegularStateConfig));
manager->start();
Stats::Counter& skipped_updates =
stats_.counter("overload.envoy.resource_monitors.fake_resource1.skipped_updates");
Stats::Gauge& pressure_gauge1 =
stats_.gauge("overload.envoy.resource_monitors.fake_resource1.pressure",
Stats::Gauge::ImportMode::NeverImport);
factory1_.monitor_->setUpdateAsync(true);
EXPECT_EQ(0, pressure_gauge1.value());
factory1_.monitor_->setPressure(0.3);
timer_cb_();
EXPECT_EQ(0, skipped_updates.value());
timer_cb_();
EXPECT_EQ(1, skipped_updates.value());
timer_cb_();
EXPECT_EQ(2, skipped_updates.value());
factory1_.monitor_->publishUpdate();
EXPECT_EQ(30, pressure_gauge1.value());
timer_cb_();
EXPECT_EQ(2, skipped_updates.value());
manager->stop();
}
constexpr char kReducedTimeoutsConfig[] = R"YAML(
refresh_interval:
seconds: 1
resource_monitors:
- name: envoy.resource_monitors.fake_resource1
actions:
- name: envoy.overload_actions.reduce_timeouts
typed_config:
"@type": type.googleapis.com/envoy.config.overload.v3.ScaleTimersOverloadActionConfig
timer_scale_factors:
- timer: HTTP_DOWNSTREAM_CONNECTION_IDLE
min_timeout: 2s
- timer: HTTP_DOWNSTREAM_STREAM_IDLE
min_scale: { value: 10 } # percent
- timer: TRANSPORT_SOCKET_CONNECT
min_scale: { value: 40 } # percent
triggers:
- name: "envoy.resource_monitors.fake_resource1"
scaled:
scaling_threshold: 0.5
saturation_threshold: 1.0
)YAML";
// These are the timer types according to the reduced timeouts config above.
constexpr std::pair<TimerType, Event::ScaledTimerMinimum> kReducedTimeoutsMinimums[]{
{TimerType::HttpDownstreamIdleConnectionTimeout,
Event::AbsoluteMinimum(std::chrono::seconds(2))},
{TimerType::HttpDownstreamIdleStreamTimeout, Event::ScaledMinimum(UnitFloat(0.1))},
{TimerType::TransportSocketConnectTimeout, Event::ScaledMinimum(UnitFloat(0.4))},
};
TEST_F(OverloadManagerImplTest, CreateScaledTimerManager) {
auto manager(createOverloadManager(kReducedTimeoutsConfig));
auto* mock_scaled_timer_manager = new Event::MockScaledRangeTimerManager();
Event::ScaledTimerTypeMapConstSharedPtr timer_minimums;
EXPECT_CALL(*manager, createScaledRangeTimerManager)
.WillOnce(
DoAll(SaveArg<1>(&timer_minimums),
Return(ByMove(Event::ScaledRangeTimerManagerPtr{mock_scaled_timer_manager}))));
Event::MockDispatcher mock_dispatcher;
auto scaled_timer_manager = manager->scaledTimerFactory()(mock_dispatcher);
EXPECT_EQ(scaled_timer_manager.get(), mock_scaled_timer_manager);
EXPECT_THAT(timer_minimums, Pointee(UnorderedElementsAreArray(kReducedTimeoutsMinimums)));
}
TEST_F(OverloadManagerImplTest, AdjustScaleFactor) {
setDispatcherExpectation();
auto manager(createOverloadManager(kReducedTimeoutsConfig));
auto* mock_scaled_timer_manager = new Event::MockScaledRangeTimerManager();
EXPECT_CALL(*manager, createScaledRangeTimerManager)
.WillOnce(Return(ByMove(Event::ScaledRangeTimerManagerPtr{mock_scaled_timer_manager})));
Event::MockDispatcher mock_dispatcher;
auto scaled_timer_manager = manager->scaledTimerFactory()(mock_dispatcher);
manager->start();
EXPECT_CALL(mock_dispatcher, post).WillOnce([](Event::PostCb cb) { cb(); });
// The scaled trigger has range [0.5, 1.0] so 0.6 should map to a scale value of 0.2, which means
// a timer scale factor of 0.8 (1 - 0.2).
EXPECT_CALL(*mock_scaled_timer_manager,
setScaleFactor(Property(&UnitFloat::value, FloatNear(0.8, 0.00001))));
factory1_.monitor_->setPressure(0.6);
timer_cb_();
}
TEST_F(OverloadManagerImplTest, DuplicateResourceMonitor) {
const std::string config = R"EOF(
resource_monitors:
- name: "envoy.resource_monitors.fake_resource1"
- name: "envoy.resource_monitors.fake_resource1"
)EOF";
EXPECT_THROW_WITH_REGEX(createOverloadManager(config), EnvoyException,
"Duplicate resource monitor .*");
}
TEST_F(OverloadManagerImplTest, DuplicateProactiveResourceMonitor) {
const std::string config = R"EOF(
resource_monitors:
- name: "envoy.resource_monitors.global_downstream_max_connections"
- name: "envoy.resource_monitors.global_downstream_max_connections"
)EOF";
EXPECT_THROW_WITH_REGEX(createOverloadManager(config), EnvoyException,
"Duplicate resource monitor .*");
}
TEST_F(OverloadManagerImplTest, DuplicateOverloadAction) {
const std::string config = R"EOF(
actions:
- name: "envoy.overload_actions.shrink_heap"
- name: "envoy.overload_actions.shrink_heap"
)EOF";
EXPECT_THROW_WITH_REGEX(createOverloadManager(config), EnvoyException,
"Duplicate overload action .*");
}
TEST_F(OverloadManagerImplTest, ActionWithUnexpectedTypedConfig) {
const std::string config = R"EOF(
actions:
- name: "envoy.overload_actions.shrink_heap"
typed_config:
"@type": type.googleapis.com/google.protobuf.Empty
)EOF";
EXPECT_THROW_WITH_REGEX(createOverloadManager(config), EnvoyException,
".* unexpected .* typed_config .*");
}
TEST_F(OverloadManagerImplTest, ReduceTimeoutsWithoutAction) {
const std::string config = R"EOF(
actions:
- name: "envoy.overload_actions.reduce_timeouts"
)EOF";
EXPECT_THROW_WITH_REGEX(createOverloadManager(config), EnvoyException,
"Unable to unpack as .*ScaleTimersOverloadActionConfig");
}
TEST_F(OverloadManagerImplTest, ReduceTimeoutsWithWrongTypedConfigMessage) {
const std::string config = R"EOF(
actions:
- name: "envoy.overload_actions.reduce_timeouts"
typed_config:
"@type": type.googleapis.com/google.protobuf.Empty
)EOF";
EXPECT_THROW_WITH_REGEX(createOverloadManager(config), EnvoyException,
"Unable to unpack as .*ScaleTimersOverloadActionConfig");
}
TEST_F(OverloadManagerImplTest, ReduceTimeoutsWithNoTimersSpecified) {
const std::string config = R"EOF(
actions:
- name: "envoy.overload_actions.reduce_timeouts"
typed_config:
"@type": type.googleapis.com/envoy.config.overload.v3.ScaleTimersOverloadActionConfig
)EOF";
EXPECT_THROW_WITH_REGEX(createOverloadManager(config), EnvoyException,
".* constraint validation failed.*");
}
// A scaled trigger action's thresholds must conform to scaling < saturation.
TEST_F(OverloadManagerImplTest, ScaledTriggerSaturationLessThanScalingThreshold) {
const std::string config = R"EOF(
resource_monitors:
- name: "envoy.resource_monitors.fake_resource1"
actions:
- name: "envoy.overload_actions.shrink_heap"
triggers:
- name: "envoy.resource_monitors.fake_resource1"
scaled:
scaling_threshold: 0.9
saturation_threshold: 0.8
)EOF";
EXPECT_THROW_WITH_REGEX(createOverloadManager(config), EnvoyException,
"scaling_threshold must be less than saturation_threshold.*");
}
// A scaled trigger action can't have threshold values that are equal.
TEST_F(OverloadManagerImplTest, ScaledTriggerThresholdsEqual) {
const std::string config = R"EOF(
resource_monitors:
- name: "envoy.resource_monitors.fake_resource1"
actions:
- name: "envoy.overload_actions.shrink_heap"
triggers:
- name: "envoy.resource_monitors.fake_resource1"
scaled:
scaling_threshold: 0.9
saturation_threshold: 0.9
)EOF";
EXPECT_THROW_WITH_REGEX(createOverloadManager(config), EnvoyException,
"scaling_threshold must be less than saturation_threshold.*");
}
TEST_F(OverloadManagerImplTest, UnknownActionShouldError) {
const std::string config = R"EOF(
resource_monitors:
- name: "envoy.resource_monitors.fake_resource1"
actions:
- name: "envoy.overload_actions.not_a_valid_action"
triggers:
- name: "envoy.resource_monitors.fake_resource1"
threshold:
value: 0.9
)EOF";
EXPECT_THROW_WITH_REGEX(createOverloadManager(config), EnvoyException,
"Unknown Overload Manager Action .*");
}
TEST_F(OverloadManagerImplTest, UnknownTrigger) {
const std::string config = R"EOF(
actions:
- name: "envoy.overload_actions.shrink_heap"
triggers:
- name: "envoy.resource_monitors.fake_resource1"
threshold:
value: 0.9
)EOF";
EXPECT_THROW_WITH_REGEX(createOverloadManager(config), EnvoyException,
"Unknown trigger resource .*");
}
TEST_F(OverloadManagerImplTest, DuplicateTrigger) {
const std::string config = R"EOF(
resource_monitors:
- name: "envoy.resource_monitors.fake_resource1"
actions:
- name: "envoy.overload_actions.shrink_heap"
triggers:
- name: "envoy.resource_monitors.fake_resource1"
threshold:
value: 0.9
- name: "envoy.resource_monitors.fake_resource1"
threshold:
value: 0.8
)EOF";
EXPECT_THROW_WITH_REGEX(createOverloadManager(config), EnvoyException, "Duplicate trigger .*");
}
TEST_F(OverloadManagerImplTest, ShouldThrowIfUsingResetStreamsWithoutBufferFactoryConfig) {
const std::string lower_greater_than_upper_config = R"EOF(
actions:
- name: envoy.overload_actions.reset_high_memory_stream
)EOF";
EXPECT_THROW_WITH_REGEX(createOverloadManager(lower_greater_than_upper_config), EnvoyException,
"Overload action .* requires buffer_factory_config.");
}
TEST_F(OverloadManagerImplTest, Shutdown) {
setDispatcherExpectation();
auto manager(createOverloadManager(kRegularStateConfig));
manager->start();
EXPECT_CALL(*timer_, disableTimer());
manager->stop();
}
TEST_F(OverloadManagerImplTest, MissingConfigTriggerType) {
constexpr char missingTriggerTypeConfig[] = R"YAML(
actions:
- name: envoy.overload_actions.shrink_heap
triggers:
- name: envoy.resource_monitors.fake_resource1
)YAML";
EXPECT_THROW_WITH_REGEX(createOverloadManager(missingTriggerTypeConfig), EnvoyException,
"action not set for trigger.*");
}
TEST_F(OverloadManagerImplTest, ProactiveResourceAllocateAndDeallocateResourceTest) {
setDispatcherExpectation();
auto manager(createOverloadManager(proactiveResourceConfig));
Stats::Counter& failed_updates =
stats_.counter("overload.envoy.resource_monitors.global_downstream_max_connections."
"failed_updates");
manager->start();
EXPECT_TRUE(manager->getThreadLocalOverloadState().isResourceMonitorEnabled(
OverloadProactiveResourceName::GlobalDownstreamMaxConnections));
bool resource_allocated = manager->getThreadLocalOverloadState().tryAllocateResource(
Server::OverloadProactiveResourceName::GlobalDownstreamMaxConnections, 1);
EXPECT_TRUE(resource_allocated);
auto monitor = manager->getThreadLocalOverloadState().getProactiveResourceMonitorForTest(
Server::OverloadProactiveResourceName::GlobalDownstreamMaxConnections);
EXPECT_NE(absl::nullopt, monitor);
EXPECT_EQ(1, monitor->currentResourceUsage());
resource_allocated = manager->getThreadLocalOverloadState().tryAllocateResource(
Server::OverloadProactiveResourceName::GlobalDownstreamMaxConnections, 3);
EXPECT_FALSE(resource_allocated);
EXPECT_EQ(1, failed_updates.value());
bool resource_deallocated = manager->getThreadLocalOverloadState().tryDeallocateResource(
Server::OverloadProactiveResourceName::GlobalDownstreamMaxConnections, 1);
EXPECT_TRUE(resource_deallocated);
EXPECT_DEATH(manager->getThreadLocalOverloadState().tryDeallocateResource(
Server::OverloadProactiveResourceName::GlobalDownstreamMaxConnections, 1),
".*Cannot deallocate resource, current resource usage is lower than decrement.*");
manager->stop();
}
class OverloadManagerSimulatedTimeTest : public OverloadManagerImplTest,
public Envoy::Event::TestUsingSimulatedTime {};
TEST_F(OverloadManagerSimulatedTimeTest, RefreshLoopDelay) {
setDispatcherExpectation();
auto manager(createOverloadManager(kRegularStateConfig));
manager->start();
simTime().advanceTimeWait(Envoy::Seconds(1));
timer_cb_();
// Check the first reading
const std::vector<uint64_t> first_reading =
stats_.histogramValues("overload.refresh_interval_delay", false);
EXPECT_EQ(first_reading.size(), 1);
EXPECT_EQ(first_reading[0], 1000);
simTime().advanceTimeWait(Envoy::Seconds(2));
timer_cb_();
// Check the second reading
const std::vector<uint64_t> second_reading =
stats_.histogramValues("overload.refresh_interval_delay", false);
EXPECT_EQ(second_reading.size(), 2);
EXPECT_EQ(second_reading[1], 2000);
manager->stop();
}
class OverloadManagerLoadShedPointImplTest : public OverloadManagerImplTest {};
TEST_F(OverloadManagerLoadShedPointImplTest, DuplicateLoadShedPoints) {
const std::string config = R"EOF(
loadshed_points:
- name: "envoy.load_shed_point.dummy_point"
- name: "envoy.load_shed_point.dummy_point"
)EOF";
EXPECT_THROW_WITH_REGEX(createOverloadManager(config), EnvoyException,
"Duplicate loadshed point .*");
}
TEST_F(OverloadManagerLoadShedPointImplTest, UnknownResource) {
const std::string config = R"EOF(
loadshed_points:
- name: "envoy.load_shed_point.dummy_point"
triggers:
- name: "envoy.resource_monitors.unknown_resource"
threshold:
value: 0.9
)EOF";
EXPECT_THROW_WITH_REGEX(createOverloadManager(config), EnvoyException,
"Unknown trigger resource .* for loadshed point .*");
}
TEST_F(OverloadManagerLoadShedPointImplTest, ThrowsIfDuplicateTrigger) {
const std::string config = R"EOF(
resource_monitors:
- name: envoy.resource_monitors.fake_resource1
loadshed_points:
- name: "envoy.load_shed_point.dummy_point"
triggers:
- name: "envoy.resource_monitors.fake_resource1"
threshold:
value: 0.9
- name: "envoy.resource_monitors.fake_resource1"
threshold:
value: 0.7
)EOF";
EXPECT_THROW_WITH_REGEX(createOverloadManager(config), EnvoyException,
"Duplicate trigger resource for LoadShedPoint .*");
}
TEST_F(OverloadManagerLoadShedPointImplTest, ReturnsNullIfNonExistentLoadShedPointRequested) {
setDispatcherExpectation();
const std::string config = R"EOF(
resource_monitors:
- name: envoy.resource_monitors.fake_resource1
loadshed_points:
- name: "test_point"
triggers:
- name: "envoy.resource_monitors.fake_resource1"
threshold:
value: 0.9
)EOF";
auto manager{createOverloadManager(config)};
manager->start();
LoadShedPoint* point = manager->getLoadShedPoint("non_existent_point");
EXPECT_EQ(point, nullptr);
}
TEST_F(OverloadManagerLoadShedPointImplTest, PointUsesTriggerToDetermineWhetherToLoadShed) {
setDispatcherExpectation();
const std::string config = R"EOF(
resource_monitors:
- name: envoy.resource_monitors.fake_resource1
loadshed_points:
- name: "test_point"
triggers:
- name: "envoy.resource_monitors.fake_resource1"
threshold:
value: 0.9
)EOF";
auto manager{createOverloadManager(config)};
manager->start();
LoadShedPoint* point = manager->getLoadShedPoint("test_point");
ASSERT_NE(point, nullptr);
Stats::Gauge& scale_percent =
stats_.gauge("overload.test_point.scale_percent", Stats::Gauge::ImportMode::Accumulate);
EXPECT_EQ(0, scale_percent.value());
EXPECT_FALSE(point->shouldShedLoad());
factory1_.monitor_->setPressure(0.65);
timer_cb_();
EXPECT_EQ(0, scale_percent.value());
EXPECT_FALSE(point->shouldShedLoad());
factory1_.monitor_->setPressure(0.95);
timer_cb_();
EXPECT_TRUE(point->shouldShedLoad());
EXPECT_EQ(100, scale_percent.value());
factory1_.monitor_->setPressure(0.7);
timer_cb_();