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overload_integration_test.cc
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overload_integration_test.cc
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#include <unordered_map>
#include "envoy/config/bootstrap/v3/bootstrap.pb.h"
#include "envoy/config/overload/v3/overload.pb.h"
#include "test/integration/base_overload_integration_test.h"
#include "test/integration/http_protocol_integration.h"
#include "test/integration/ssl_utility.h"
#include "test/test_common/test_runtime.h"
#include "absl/strings/str_cat.h"
using testing::InvokeWithoutArgs;
namespace Envoy {
using testing::HasSubstr;
class OverloadIntegrationTest : public BaseOverloadIntegrationTest,
public HttpProtocolIntegrationTest {
protected:
void initializeOverloadManager(const envoy::config::overload::v3::OverloadAction& overload_action,
absl::optional<bool> appendLocalOverloadHeader = absl::nullopt) {
setupOverloadManagerConfig(overload_action);
config_helper_.addConfigModifier([this](envoy::config::bootstrap::v3::Bootstrap& bootstrap) {
*bootstrap.mutable_overload_manager() = this->overload_manager_config_;
});
if (appendLocalOverloadHeader.has_value() && appendLocalOverloadHeader.value()) {
config_helper_.addConfigModifier(
[=](envoy::extensions::filters::network::http_connection_manager::v3::
HttpConnectionManager& cm) -> void { cm.set_append_local_overload(true); });
}
initialize();
updateResource(0);
}
void initializeWithBypassOverloadManager(
const envoy::config::overload::v3::OverloadAction& overload_action) {
setupOverloadManagerConfig(overload_action);
config_helper_.addConfigModifier([this](envoy::config::bootstrap::v3::Bootstrap& bootstrap) {
*bootstrap.mutable_overload_manager() = this->overload_manager_config_;
});
config_helper_.addConfigModifier([](envoy::config::bootstrap::v3::Bootstrap& bootstrap) {
auto* listener = bootstrap.mutable_static_resources()->mutable_listeners(0);
listener->set_bypass_overload_manager(true);
auto* new_listener = bootstrap.mutable_static_resources()->add_listeners();
new_listener->CopyFrom(*listener);
new_listener->set_name("http_2");
new_listener->set_bypass_overload_manager(false);
});
initialize();
updateResource(0);
}
};
INSTANTIATE_TEST_SUITE_P(Protocols, OverloadIntegrationTest,
testing::ValuesIn(HttpProtocolIntegrationTest::getProtocolTestParams(
{Http::CodecClient::Type::HTTP1, Http::CodecClient::Type::HTTP2,
Http::CodecClient::Type::HTTP3},
{FakeHttpConnection::Type::HTTP1, FakeHttpConnection::Type::HTTP2})),
HttpProtocolIntegrationTest::protocolTestParamsToString);
TEST_P(OverloadIntegrationTest, CloseStreamsWhenOverloaded) {
initializeOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::OverloadAction>(R"EOF(
name: "envoy.overload_actions.stop_accepting_requests"
triggers:
- name: "envoy.resource_monitors.testonly.fake_resource_monitor"
threshold:
value: 0.9
)EOF"));
// Put envoy in overloaded state and check that it drops new requests.
// Test both header-only and header+body requests since the code paths are slightly different.
updateResource(0.9);
test_server_->waitForGaugeEq("overload.envoy.overload_actions.stop_accepting_requests.active", 1);
Http::TestRequestHeaderMapImpl request_headers{{":method", "GET"},
{":path", "/test/long/url"},
{":scheme", "http"},
{":authority", "sni.lyft.com"}};
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
auto response = codec_client_->makeRequestWithBody(request_headers, 10);
ASSERT_TRUE(response->waitForEndStream());
EXPECT_TRUE(response->complete());
EXPECT_EQ("503", response->headers().getStatusValue());
// Verify that no local overload header is added by default
EXPECT_EQ(true, response->headers().get(Http::Headers::get().EnvoyLocalOverloaded).empty());
EXPECT_EQ("envoy overloaded", response->body());
codec_client_->close();
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
response = codec_client_->makeHeaderOnlyRequest(request_headers);
ASSERT_TRUE(response->waitForEndStream());
EXPECT_TRUE(response->complete());
EXPECT_EQ("503", response->headers().getStatusValue());
EXPECT_EQ(true, response->headers().get(Http::Headers::get().EnvoyLocalOverloaded).empty());
EXPECT_EQ("envoy overloaded", response->body());
codec_client_->close();
// Deactivate overload state and check that new requests are accepted.
updateResource(0.8);
test_server_->waitForGaugeEq("overload.envoy.overload_actions.stop_accepting_requests.active", 0);
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
response = sendRequestAndWaitForResponse(request_headers, 0, default_response_headers_, 0);
EXPECT_TRUE(upstream_request_->complete());
EXPECT_EQ(0U, upstream_request_->bodyLength());
EXPECT_TRUE(response->complete());
EXPECT_EQ("200", response->headers().getStatusValue());
EXPECT_EQ(0U, response->body().size());
}
TEST_P(OverloadIntegrationTest, AppendLocalOverloadHeader) {
initializeOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::OverloadAction>(R"EOF(
name: "envoy.overload_actions.stop_accepting_requests"
triggers:
- name: "envoy.resource_monitors.testonly.fake_resource_monitor"
threshold:
value: 0.9
)EOF"),
true);
// Put envoy in overloaded state and check that it drops new requests and the local overload is
// correctly added. Test both header-only and header+body requests since the code paths are
// slightly different.
updateResource(0.9);
test_server_->waitForGaugeEq("overload.envoy.overload_actions.stop_accepting_requests.active", 1);
Http::TestRequestHeaderMapImpl request_headers{{":method", "GET"},
{":path", "/test/long/url"},
{":scheme", "http"},
{":authority", "sni.lyft.com"}};
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
auto response = codec_client_->makeRequestWithBody(request_headers, 10);
ASSERT_TRUE(response->waitForEndStream());
EXPECT_TRUE(response->complete());
EXPECT_EQ("503", response->headers().getStatusValue());
EXPECT_EQ(Http::Headers::get().EnvoyOverloadedValues.True,
response->headers()
.get(Http::Headers::get().EnvoyLocalOverloaded)[0]
->value()
.getStringView());
EXPECT_EQ("envoy overloaded", response->body());
codec_client_->close();
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
response = codec_client_->makeHeaderOnlyRequest(request_headers);
ASSERT_TRUE(response->waitForEndStream());
EXPECT_TRUE(response->complete());
EXPECT_EQ("503", response->headers().getStatusValue());
EXPECT_EQ(Http::Headers::get().EnvoyOverloadedValues.True,
response->headers()
.get(Http::Headers::get().EnvoyLocalOverloaded)[0]
->value()
.getStringView());
EXPECT_EQ("envoy overloaded", response->body());
codec_client_->close();
}
TEST_P(OverloadIntegrationTest, DisableKeepaliveWhenOverloaded) {
if (downstreamProtocol() != Http::CodecType::HTTP1) {
return; // only relevant for downstream HTTP1.x connections
}
initializeOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::OverloadAction>(R"EOF(
name: "envoy.overload_actions.disable_http_keepalive"
triggers:
- name: "envoy.resource_monitors.testonly.fake_resource_monitor"
threshold:
value: 0.8
)EOF"));
// Put envoy in overloaded state and check that it disables keepalive
updateResource(0.8);
test_server_->waitForGaugeEq("overload.envoy.overload_actions.disable_http_keepalive.active", 1);
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
Http::TestRequestHeaderMapImpl request_headers{{":method", "GET"},
{":path", "/test/long/url"},
{":scheme", "http"},
{":authority", "sni.lyft.com"}};
auto response = sendRequestAndWaitForResponse(request_headers, 1, default_response_headers_, 1);
ASSERT_TRUE(codec_client_->waitForDisconnect());
EXPECT_TRUE(response->complete());
EXPECT_EQ("200", response->headers().getStatusValue());
EXPECT_EQ("close", response->headers().getConnectionValue());
// Deactivate overload state and check that keepalive is not disabled
updateResource(0.7);
test_server_->waitForGaugeEq("overload.envoy.overload_actions.disable_http_keepalive.active", 0);
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
response = sendRequestAndWaitForResponse(request_headers, 1, default_response_headers_, 1);
EXPECT_TRUE(response->complete());
EXPECT_EQ("200", response->headers().getStatusValue());
EXPECT_EQ(nullptr, response->headers().Connection());
}
TEST_P(OverloadIntegrationTest, StopAcceptingConnectionsWhenOverloaded) {
initializeOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::OverloadAction>(R"EOF(
name: "envoy.overload_actions.stop_accepting_connections"
triggers:
- name: "envoy.resource_monitors.testonly.fake_resource_monitor"
threshold:
value: 0.95
)EOF"));
// Put envoy in overloaded state and check that it doesn't accept the new client connection.
updateResource(0.95);
test_server_->waitForGaugeEq("overload.envoy.overload_actions.stop_accepting_connections.active",
1);
IntegrationStreamDecoderPtr response;
if (downstreamProtocol() == Http::CodecClient::Type::HTTP3) {
// For HTTP/3, excess connections are force-rejected.
codec_client_ =
makeRawHttpConnection(makeClientConnection((lookupPort("http"))), absl::nullopt);
EXPECT_TRUE(codec_client_->disconnected());
} else {
// For HTTP/2 and below, excess connection won't be accepted, but will hang out
// in a pending state and resume below.
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
response = codec_client_->makeRequestWithBody(default_request_headers_, 10);
EXPECT_FALSE(fake_upstreams_[0]->waitForHttpConnection(*dispatcher_, fake_upstream_connection_,
std::chrono::milliseconds(1000)));
}
// Reduce load a little to allow the connection to be accepted.
updateResource(0.9);
test_server_->waitForGaugeEq("overload.envoy.overload_actions.stop_accepting_connections.active",
0);
if (downstreamProtocol() == Http::CodecClient::Type::HTTP3) {
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
response = codec_client_->makeRequestWithBody(default_request_headers_, 10);
}
EXPECT_TRUE(fake_upstreams_[0]->waitForHttpConnection(*dispatcher_, fake_upstream_connection_));
EXPECT_TRUE(fake_upstream_connection_->waitForNewStream(*dispatcher_, upstream_request_));
ASSERT_TRUE(upstream_request_->waitForHeadersComplete());
ASSERT_TRUE(upstream_request_->waitForData(*dispatcher_, 10));
upstream_request_->encodeHeaders(Http::TestResponseHeaderMapImpl{{":status", "202"}}, true);
ASSERT_TRUE(response->waitForEndStream());
EXPECT_TRUE(response->complete());
EXPECT_EQ("202", response->headers().getStatusValue());
codec_client_->close();
}
TEST_P(OverloadIntegrationTest, BypassOverloadManagerTest) {
initializeWithBypassOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::OverloadAction>(R"EOF(
name: "envoy.overload_actions.stop_accepting_requests"
triggers:
- name: "envoy.resource_monitors.testonly.fake_resource_monitor"
threshold:
value: 0.9
)EOF"));
// Put envoy in overloaded state and validate that it doesn't drop new requests
// because we chose to bypass the overload manager on this listener.
updateResource(1);
test_server_->waitForGaugeEq("overload.envoy.overload_actions.stop_accepting_requests.active", 1);
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
auto response =
sendRequestAndWaitForResponse(default_request_headers_, 0, default_response_headers_, 0);
EXPECT_TRUE(upstream_request_->complete());
EXPECT_EQ(0U, upstream_request_->bodyLength());
EXPECT_TRUE(response->complete());
EXPECT_EQ("200", response->headers().getStatusValue());
EXPECT_EQ(0U, response->body().size());
codec_client_->close();
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http_2"))));
response = codec_client_->makeRequestWithBody(default_request_headers_, 10);
ASSERT_TRUE(response->waitForEndStream());
EXPECT_TRUE(response->complete());
EXPECT_EQ("503", response->headers().getStatusValue());
// Verify that no local overload header is added by default
EXPECT_EQ(true, response->headers().get(Http::Headers::get().EnvoyLocalOverloaded).empty());
EXPECT_EQ("envoy overloaded", response->body());
codec_client_->close();
}
class OverloadScaledTimerIntegrationTest : public OverloadIntegrationTest {
protected:
void initializeOverloadManager(
const envoy::config::overload::v3::ScaleTimersOverloadActionConfig& config) {
envoy::config::overload::v3::OverloadAction overload_action =
TestUtility::parseYaml<envoy::config::overload::v3::OverloadAction>(R"EOF(
name: "envoy.overload_actions.reduce_timeouts"
triggers:
- name: "envoy.resource_monitors.testonly.fake_resource_monitor"
scaled:
scaling_threshold: 0.5
saturation_threshold: 0.9
)EOF");
overload_action.mutable_typed_config()->PackFrom(config);
OverloadIntegrationTest::initializeOverloadManager(overload_action);
}
};
INSTANTIATE_TEST_SUITE_P(Protocols, OverloadScaledTimerIntegrationTest,
testing::ValuesIn(HttpProtocolIntegrationTest::getProtocolTestParams()),
HttpProtocolIntegrationTest::protocolTestParamsToString);
TEST_P(OverloadScaledTimerIntegrationTest, CloseIdleHttpConnections) {
initializeOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::ScaleTimersOverloadActionConfig>(R"EOF(
timer_scale_factors:
- timer: HTTP_DOWNSTREAM_CONNECTION_IDLE
min_timeout: 5s
)EOF"));
const Http::TestRequestHeaderMapImpl request_headers{{":method", "GET"},
{":path", "/test/long/url"},
{":scheme", "http"},
{":authority", "sni.lyft.com"}};
// Create an HTTP connection and complete a request.
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
auto response = codec_client_->makeRequestWithBody(request_headers, 10);
ASSERT_TRUE(fake_upstreams_[0]->waitForHttpConnection(*dispatcher_, fake_upstream_connection_));
ASSERT_TRUE(fake_upstream_connection_->waitForNewStream(*dispatcher_, upstream_request_));
ASSERT_TRUE(upstream_request_->waitForHeadersComplete());
ASSERT_TRUE(upstream_request_->waitForData(*dispatcher_, 10));
upstream_request_->encodeHeaders(Http::TestResponseHeaderMapImpl{{":status", "200"}}, true);
ASSERT_TRUE(response->waitForEndStream());
// At this point, the connection should be idle but still open.
ASSERT_TRUE(codec_client_->connected());
// Set the load so the timer is reduced but not to the minimum value.
updateResource(0.8);
test_server_->waitForGaugeGe("overload.envoy.overload_actions.reduce_timeouts.scale_percent", 50);
// Advancing past the minimum time shouldn't close the connection.
timeSystem().advanceTimeWait(std::chrono::seconds(5));
// Increase load so that the minimum time has now elapsed.
updateResource(0.9);
test_server_->waitForGaugeEq("overload.envoy.overload_actions.reduce_timeouts.scale_percent",
100);
// Wait for the proxy to notice and take action for the overload.
test_server_->waitForCounterGe("http.config_test.downstream_cx_idle_timeout", 1);
dispatcher_->run(Event::Dispatcher::RunType::NonBlock);
if (GetParam().downstream_protocol == Http::CodecType::HTTP1) {
// For HTTP1, Envoy will start draining but will wait to close the
// connection. If a new stream comes in, it will set the connection header
// to "close" on the response and close the connection after.
auto response = codec_client_->makeRequestWithBody(request_headers, 10);
ASSERT_TRUE(fake_upstream_connection_->waitForNewStream(*dispatcher_, upstream_request_));
ASSERT_TRUE(upstream_request_->waitForHeadersComplete());
ASSERT_TRUE(upstream_request_->waitForData(*dispatcher_, 10));
upstream_request_->encodeHeaders(Http::TestResponseHeaderMapImpl{{":status", "200"}}, true);
ASSERT_TRUE(response->waitForEndStream());
EXPECT_EQ(response->headers().getConnectionValue(), "close");
} else {
ASSERT_TRUE(codec_client_->waitForDisconnect());
EXPECT_TRUE(codec_client_->sawGoAway());
}
codec_client_->close();
}
TEST_P(OverloadScaledTimerIntegrationTest, HTTP3CloseIdleHttpConnectionsDuringHandshake) {
if (downstreamProtocol() != Http::CodecClient::Type::HTTP3) {
return;
}
TestScopedRuntime scoped_runtime;
config_helper_.addConfigModifier([](envoy::config::bootstrap::v3::Bootstrap& bootstrap) {
auto* proof_source_config = bootstrap.mutable_static_resources()
->mutable_listeners(0)
->mutable_udp_listener_config()
->mutable_quic_options()
->mutable_proof_source_config();
proof_source_config->set_name("envoy.quic.proof_source.pending_signing");
proof_source_config->mutable_typed_config();
});
initializeOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::ScaleTimersOverloadActionConfig>(R"EOF(
timer_scale_factors:
- timer: HTTP_DOWNSTREAM_CONNECTION_IDLE
min_timeout: 3s
)EOF"));
// Set the load so the timer is reduced but not to the minimum value.
updateResource(0.8);
test_server_->waitForGaugeGe("overload.envoy.overload_actions.reduce_timeouts.scale_percent", 50);
// Create an HTTP connection without finishing the handshake.
codec_client_ = makeRawHttpConnection(makeClientConnection((lookupPort("http"))), absl::nullopt,
/*wait_till_connected=*/false);
EXPECT_FALSE(codec_client_->connected());
// Advancing past the minimum time shouldn't close the connection.
timeSystem().advanceTimeWait(std::chrono::seconds(3));
dispatcher_->run(Event::Dispatcher::RunType::NonBlock);
EXPECT_FALSE(codec_client_->connected());
EXPECT_FALSE(codec_client_->disconnected());
// Increase load more so that the timer is reduced to the minimum.
updateResource(0.9);
test_server_->waitForGaugeEq("overload.envoy.overload_actions.reduce_timeouts.scale_percent",
100);
// Create another HTTP connection without finishing handshake.
IntegrationCodecClientPtr codec_client2 = makeRawHttpConnection(
makeClientConnection((lookupPort("http"))), absl::nullopt, /*wait_till_connected=*/false);
EXPECT_FALSE(codec_client2->connected());
// Advancing past the minimum time and wait for the proxy to notice and close both connections.
timeSystem().advanceTimeWait(std::chrono::seconds(3));
test_server_->waitForCounterGe("http.config_test.downstream_cx_idle_timeout", 2);
ASSERT_TRUE(codec_client_->waitForDisconnect());
EXPECT_FALSE(codec_client_->sawGoAway());
EXPECT_FALSE(codec_client2->connected());
ASSERT_TRUE(codec_client2->waitForDisconnect());
EXPECT_FALSE(codec_client2->sawGoAway());
}
TEST_P(OverloadScaledTimerIntegrationTest, CloseIdleHttpStream) {
initializeOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::ScaleTimersOverloadActionConfig>(R"EOF(
timer_scale_factors:
- timer: HTTP_DOWNSTREAM_STREAM_IDLE
min_timeout: 5s
)EOF"));
const Http::TestRequestHeaderMapImpl request_headers{{":method", "GET"},
{":path", "/test/long/url"},
{":scheme", "http"},
{":authority", "sni.lyft.com"}};
// Create an HTTP connection and start a request.
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
auto response = codec_client_->makeRequestWithBody(request_headers, 10);
ASSERT_TRUE(fake_upstreams_[0]->waitForHttpConnection(*dispatcher_, fake_upstream_connection_));
ASSERT_TRUE(fake_upstream_connection_->waitForNewStream(*dispatcher_, upstream_request_));
ASSERT_TRUE(upstream_request_->waitForHeadersComplete());
// At this point, Envoy is waiting for the upstream to respond, but that won't
// happen before it hits the stream timeout.
// Set the load so the timer is reduced but not to the minimum value.
updateResource(0.8);
test_server_->waitForGaugeGe("overload.envoy.overload_actions.reduce_timeouts.scale_percent", 50);
// Advancing past the minimum time shouldn't end the stream.
timeSystem().advanceTimeWait(std::chrono::seconds(5));
// Increase load so that the minimum time has now elapsed.
updateResource(0.9);
test_server_->waitForGaugeEq("overload.envoy.overload_actions.reduce_timeouts.scale_percent",
100);
// Wait for the proxy to notice and take action for the overload.
test_server_->waitForCounterGe("http.config_test.downstream_rq_idle_timeout", 1);
ASSERT_TRUE(response->waitForEndStream());
EXPECT_EQ(response->headers().getStatusValue(), "504");
EXPECT_THAT(response->body(), HasSubstr("stream timeout"));
}
TEST_P(OverloadScaledTimerIntegrationTest, TlsHandshakeTimeout) {
if (downstreamProtocol() == Http::CodecClient::Type::HTTP3 ||
upstreamProtocol() == Http::CodecClient::Type::HTTP3) {
// TODO(#26236): Fix this test for H3.
return;
}
// Set up the Envoy to expect a TLS connection, with a 20 second timeout that can scale down to 5
// seconds.
config_helper_.addSslConfig();
config_helper_.addConfigModifier([&](envoy::config::bootstrap::v3::Bootstrap& bootstrap) -> void {
auto* filter_chain =
bootstrap.mutable_static_resources()->mutable_listeners(0)->mutable_filter_chains(0);
auto* connect_timeout = filter_chain->mutable_transport_socket_connect_timeout();
connect_timeout->set_seconds(20);
connect_timeout->set_nanos(0);
});
initializeOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::ScaleTimersOverloadActionConfig>(R"EOF(
timer_scale_factors:
- timer: TRANSPORT_SOCKET_CONNECT
min_timeout: 5s
)EOF"));
// Set up a delinquent transport socket that causes the dispatcher to exit on every read & write
// instead of actually doing anything useful.
auto bad_transport_socket = std::make_unique<NiceMock<Network::MockTransportSocket>>();
Network::TransportSocketCallbacks* transport_callbacks;
EXPECT_CALL(*bad_transport_socket, setTransportSocketCallbacks)
.WillOnce(SaveArgAddress(&transport_callbacks));
ON_CALL(*bad_transport_socket, doRead).WillByDefault(InvokeWithoutArgs([&] {
Buffer::OwnedImpl buffer;
transport_callbacks->connection().dispatcher().exit();
// Read some amount of data; what's more important is whether the socket was remote-closed. That
// needs to be propagated to the socket.
return Network::IoResult{transport_callbacks->ioHandle().read(buffer, 2 * 1024).return_value_ ==
0
? Network::PostIoAction::Close
: Network::PostIoAction::KeepOpen,
0, false};
}));
ON_CALL(*bad_transport_socket, doWrite).WillByDefault(InvokeWithoutArgs([&] {
transport_callbacks->connection().dispatcher().exit();
return Network::IoResult{Network::PostIoAction::KeepOpen, 0, false};
}));
ConnectionStatusCallbacks connect_callbacks;
Network::Address::InstanceConstSharedPtr address =
Ssl::getSslAddress(version_, lookupPort("http"));
auto bad_ssl_client =
dispatcher_->createClientConnection(address, Network::Address::InstanceConstSharedPtr(),
std::move(bad_transport_socket), nullptr, nullptr);
bad_ssl_client->addConnectionCallbacks(connect_callbacks);
bad_ssl_client->enableHalfClose(true);
bad_ssl_client->connect();
// Run the dispatcher until it exits due to a read/write.
dispatcher_->run(Event::Dispatcher::RunType::RunUntilExit);
// At this point, the connection should be idle but the SSL handshake isn't done.
EXPECT_FALSE(connect_callbacks.connected());
// Set the load so the timer is reduced but not to the minimum value.
updateResource(0.8);
test_server_->waitForGaugeGe("overload.envoy.overload_actions.reduce_timeouts.scale_percent", 50);
// Advancing past the minimum time shouldn't close the connection, but it shouldn't complete it
// either.
timeSystem().advanceTimeWait(std::chrono::seconds(5));
EXPECT_FALSE(connect_callbacks.connected());
// At this point, Envoy has been waiting for the (bad) client to finish the TLS handshake for 5
// seconds. Increase the load so that the minimum time has now elapsed. This should cause Envoy to
// close the connection on its end.
updateResource(0.9);
test_server_->waitForGaugeEq("overload.envoy.overload_actions.reduce_timeouts.scale_percent",
100);
// The bad client will continue attempting to read, eventually noticing the remote close and
// closing the connection.
while (!connect_callbacks.closed()) {
dispatcher_->run(Event::Dispatcher::RunType::NonBlock);
}
// The transport-level connection was never completed, and the connection was closed.
EXPECT_FALSE(connect_callbacks.connected());
EXPECT_TRUE(connect_callbacks.closed());
}
class LoadShedPointIntegrationTest : public BaseOverloadIntegrationTest,
public HttpProtocolIntegrationTest {
protected:
void initializeOverloadManager(const envoy::config::overload::v3::LoadShedPoint& config) {
setupOverloadManagerConfig(config);
config_helper_.addConfigModifier([this](envoy::config::bootstrap::v3::Bootstrap& bootstrap) {
*bootstrap.mutable_overload_manager() = this->overload_manager_config_;
});
initialize();
updateResource(0);
}
void
initializeWithBypassOverloadManager(const envoy::config::overload::v3::LoadShedPoint& config) {
setupOverloadManagerConfig(config);
config_helper_.addConfigModifier([this](envoy::config::bootstrap::v3::Bootstrap& bootstrap) {
*bootstrap.mutable_overload_manager() = this->overload_manager_config_;
});
config_helper_.addConfigModifier([](envoy::config::bootstrap::v3::Bootstrap& bootstrap) {
auto* listener = bootstrap.mutable_static_resources()->mutable_listeners(0);
listener->set_bypass_overload_manager(true);
// add a listener that doesn't bypass overload manager.
auto* new_listener = bootstrap.mutable_static_resources()->add_listeners();
new_listener->CopyFrom(*listener);
new_listener->set_name("http_2");
new_listener->set_bypass_overload_manager(false);
});
initialize();
updateResource(0);
}
};
INSTANTIATE_TEST_SUITE_P(Protocols, LoadShedPointIntegrationTest,
testing::ValuesIn(HttpProtocolIntegrationTest::getProtocolTestParams(
{Http::CodecClient::Type::HTTP1, Http::CodecClient::Type::HTTP2,
Http::CodecClient::Type::HTTP3},
{FakeHttpConnection::Type::HTTP1})),
HttpProtocolIntegrationTest::protocolTestParamsToString);
TEST_P(LoadShedPointIntegrationTest, ListenerAcceptShedsLoad) {
// QUIC uses UDP, not TCP.
if (downstreamProtocol() == Http::CodecClient::Type::HTTP3) {
return;
}
autonomous_upstream_ = true;
initializeOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::LoadShedPoint>(R"EOF(
name: "envoy.load_shed_points.tcp_listener_accept"
triggers:
- name: "envoy.resource_monitors.testonly.fake_resource_monitor"
threshold:
value: 0.90
)EOF"));
// Put envoy in overloaded state and check that it rejects the new client connection.
updateResource(0.95);
test_server_->waitForGaugeEq("overload.envoy.load_shed_points.tcp_listener_accept.scale_percent",
100);
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
if (version_ == Network::Address::IpVersion::v4) {
test_server_->waitForCounterEq("listener.127.0.0.1_0.downstream_cx_overload_reject", 1);
} else {
test_server_->waitForCounterEq("listener.[__1]_0.downstream_cx_overload_reject", 1);
}
ASSERT_TRUE(codec_client_->waitForDisconnect());
// Disable overload, we should allow connections.
updateResource(0.80);
test_server_->waitForGaugeEq("overload.envoy.load_shed_points.tcp_listener_accept.scale_percent",
0);
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
auto response = codec_client_->makeHeaderOnlyRequest(default_request_headers_);
ASSERT_TRUE(response->waitForEndStream());
}
TEST_P(LoadShedPointIntegrationTest, AcceptNewHttpStreamShedsLoad) {
autonomous_upstream_ = true;
initializeOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::LoadShedPoint>(R"EOF(
name: "envoy.load_shed_points.http_connection_manager_decode_headers"
triggers:
- name: "envoy.resource_monitors.testonly.fake_resource_monitor"
threshold:
value: 0.90
)EOF"));
// Put envoy in overloaded state and check that it sends a local reply for the
// new stream.
updateResource(0.95);
test_server_->waitForGaugeEq(
"overload.envoy.load_shed_points.http_connection_manager_decode_headers.scale_percent", 100);
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
auto response_that_will_be_local_reply =
codec_client_->makeHeaderOnlyRequest(default_request_headers_);
test_server_->waitForCounterEq("http.config_test.downstream_rq_overload_close", 1);
ASSERT_TRUE(response_that_will_be_local_reply->waitForEndStream());
EXPECT_EQ(response_that_will_be_local_reply->headers().getStatusValue(), "503");
// Disable overload, Envoy should proxy the request.
updateResource(0.80);
test_server_->waitForGaugeEq(
"overload.envoy.load_shed_points.http_connection_manager_decode_headers.scale_percent", 0);
auto response_that_will_be_proxied =
codec_client_->makeHeaderOnlyRequest(default_request_headers_);
ASSERT_TRUE(response_that_will_be_proxied->waitForEndStream());
EXPECT_EQ(response_that_will_be_proxied->headers().getStatusValue(), "200");
// Should not be incremented as we didn't reject the request.
test_server_->waitForCounterEq("http.config_test.downstream_rq_overload_close", 1);
}
TEST_P(LoadShedPointIntegrationTest, Http1ServerDispatchAbortShedsLoadWhenNewRequest) {
// Test only applies to HTTP1.
if (downstreamProtocol() != Http::CodecClient::Type::HTTP1) {
return;
}
autonomous_upstream_ = true;
initializeOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::LoadShedPoint>(R"EOF(
name: "envoy.load_shed_points.http1_server_abort_dispatch"
triggers:
- name: "envoy.resource_monitors.testonly.fake_resource_monitor"
threshold:
value: 0.90
)EOF"));
test_server_->waitForCounterEq("http.config_test.downstream_rq_overload_close", 0);
// Put envoy in overloaded state and check that the dispatch fails.
updateResource(0.95);
test_server_->waitForGaugeEq(
"overload.envoy.load_shed_points.http1_server_abort_dispatch.scale_percent", 100);
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
auto [encoder, decoder] = codec_client_->startRequest(default_request_headers_);
// We should get rejected local reply and connection close.
test_server_->waitForCounterEq("http.config_test.downstream_rq_overload_close", 1);
ASSERT_TRUE(decoder->waitForEndStream());
EXPECT_EQ(decoder->headers().getStatusValue(), "500");
ASSERT_TRUE(codec_client_->waitForDisconnect());
// Disable overload, we should allow connections.
updateResource(0.80);
test_server_->waitForGaugeEq(
"overload.envoy.load_shed_points.http1_server_abort_dispatch.scale_percent", 0);
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
auto response = codec_client_->makeHeaderOnlyRequest(default_request_headers_);
ASSERT_TRUE(response->waitForEndStream());
EXPECT_EQ(response->headers().getStatusValue(), "200");
}
// Test using 100-continue to start the response before doing triggering Overload.
// Even though Envoy has encoded the 1xx headers, 1xx headers are not the actual response
// so Envoy should still send the local reply when shedding load.
TEST_P(LoadShedPointIntegrationTest,
Http1ServerDispatchAbortShedsLoadWithLocalReplyWhen1xxResponseStarted) {
// Test only applies to HTTP1.
if (downstreamProtocol() != Http::CodecClient::Type::HTTP1) {
return;
}
initializeOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::LoadShedPoint>(R"EOF(
name: "envoy.load_shed_points.http1_server_abort_dispatch"
triggers:
- name: "envoy.resource_monitors.testonly.fake_resource_monitor"
threshold:
value: 0.90
)EOF"));
test_server_->waitForCounterEq("http.config_test.downstream_rq_overload_close", 0);
// Start the 100-continue request
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
auto encoder_decoder =
codec_client_->startRequest(Http::TestRequestHeaderMapImpl{{":method", "POST"},
{":path", "/dynamo/url"},
{":scheme", "http"},
{":authority", "sni.lyft.com"},
{"expect", "100-contINUE"}});
// Wait for 100-continue
request_encoder_ = &encoder_decoder.first;
auto response = std::move(encoder_decoder.second);
ASSERT_TRUE(fake_upstreams_[0]->waitForHttpConnection(*dispatcher_, fake_upstream_connection_));
// The continue headers should arrive immediately.
response->waitFor1xxHeaders();
ASSERT_TRUE(fake_upstream_connection_->waitForNewStream(*dispatcher_, upstream_request_));
// Put envoy in overloaded state and check that it rejects the continuing
// dispatch.
updateResource(0.95);
test_server_->waitForGaugeEq(
"overload.envoy.load_shed_points.http1_server_abort_dispatch.scale_percent", 100);
codec_client_->sendData(*request_encoder_, 10, true);
ASSERT_TRUE(response->waitForEndStream());
EXPECT_EQ(response->headers().getStatusValue(), "500");
test_server_->waitForCounterEq("http.config_test.downstream_rq_overload_close", 1);
}
TEST_P(LoadShedPointIntegrationTest, Http1ServerDispatchShouldNotAbortEncodingUpstreamResponse) {
// Test only applies to HTTP1.
if (downstreamProtocol() != Http::CodecClient::Type::HTTP1) {
return;
}
initializeOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::LoadShedPoint>(R"EOF(
name: "envoy.load_shed_points.http1_server_abort_dispatch"
triggers:
- name: "envoy.resource_monitors.testonly.fake_resource_monitor"
threshold:
value: 0.90
)EOF"));
test_server_->waitForCounterEq("http.config_test.downstream_rq_overload_close", 0);
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
auto response = codec_client_->makeHeaderOnlyRequest(default_request_headers_);
waitForNextUpstreamRequest();
upstream_request_->encodeHeaders(default_response_headers_, false);
// Put envoy in overloaded state, the response should succeed.
updateResource(0.95);
test_server_->waitForGaugeEq(
"overload.envoy.load_shed_points.http1_server_abort_dispatch.scale_percent", 100);
upstream_request_->encodeData(100, true);
ASSERT_TRUE(response->waitForEndStream());
EXPECT_EQ(response->headers().getStatusValue(), "200");
test_server_->waitForCounterEq("http.config_test.downstream_rq_overload_close", 0);
}
TEST_P(LoadShedPointIntegrationTest, Http1ServerDispatchAbortClosesConnectionWhenResponseStarted) {
// Test only applies to HTTP1.
if (downstreamProtocol() != Http::CodecClient::Type::HTTP1) {
return;
}
initializeOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::LoadShedPoint>(R"EOF(
name: "envoy.load_shed_points.http1_server_abort_dispatch"
triggers:
- name: "envoy.resource_monitors.testonly.fake_resource_monitor"
threshold:
value: 0.90
)EOF"));
test_server_->waitForCounterEq("http.config_test.downstream_rq_overload_close", 0);
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
auto encoder_decoder = codec_client_->startRequest(Http::TestRequestHeaderMapImpl{
{":method", "POST"},
{":path", "/dynamo/url"},
{":scheme", "http"},
{":authority", "sni.lyft.com"},
});
request_encoder_ = &encoder_decoder.first;
auto response = std::move(encoder_decoder.second);
ASSERT_TRUE(fake_upstreams_[0]->waitForHttpConnection(*dispatcher_, fake_upstream_connection_));
ASSERT_TRUE(fake_upstream_connection_->waitForNewStream(*dispatcher_, upstream_request_));
upstream_request_->encodeHeaders(default_response_headers_, false);
response->waitForHeaders();
// Put envoy in overloaded state, the next dispatch should fail.
updateResource(0.95);
test_server_->waitForGaugeEq(
"overload.envoy.load_shed_points.http1_server_abort_dispatch.scale_percent", 100);
Buffer::OwnedImpl data("hello world");
request_encoder_->encodeData(data, true);
ASSERT_TRUE(codec_client_->waitForDisconnect());
EXPECT_FALSE(response->complete());
test_server_->waitForCounterEq("http.config_test.downstream_rq_overload_close", 1);
}
TEST_P(LoadShedPointIntegrationTest, Http2ServerDispatchSendsGoAwayCompletingPendingRequests) {
// Test only applies to HTTP2.
if (downstreamProtocol() != Http::CodecClient::Type::HTTP2) {
return;
}
autonomous_upstream_ = true;
initializeOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::LoadShedPoint>(R"EOF(
name: "envoy.load_shed_points.http2_server_go_away_on_dispatch"
triggers:
- name: "envoy.resource_monitors.testonly.fake_resource_monitor"
threshold:
value: 0.90
)EOF"));
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
auto [first_request_encoder, first_request_decoder] =
codec_client_->startRequest(default_request_headers_);
test_server_->waitForCounterEq("http.config_test.downstream_rq_http2_total", 1);
// Put envoy in overloaded state to send GOAWAY frames.
updateResource(0.95);
test_server_->waitForGaugeEq(
"overload.envoy.load_shed_points.http2_server_go_away_on_dispatch.scale_percent", 100);
auto second_request_decoder = codec_client_->makeHeaderOnlyRequest(default_request_headers_);
// Wait for reply of the first request which should be allowed to complete.
// The downstream should also receive the GOAWAY.
Buffer::OwnedImpl first_request_body{"foo"};
first_request_encoder.encodeData(first_request_body, true);
ASSERT_TRUE(first_request_decoder->waitForEndStream());
EXPECT_TRUE(codec_client_->sawGoAway());
test_server_->waitForCounterEq("http2.goaway_sent", 1);
// The GOAWAY gets submitted with the first created stream as the last stream
// that will be processed on this connection, so the second stream's frames
// are ignored.
EXPECT_FALSE(second_request_decoder->complete());
updateResource(0.80);
test_server_->waitForGaugeEq(
"overload.envoy.load_shed_points.http2_server_go_away_on_dispatch.scale_percent", 0);
}
TEST_P(LoadShedPointIntegrationTest, HttpConnectionMnagerCloseConnectionCreatingCodec) {
if (downstreamProtocol() == Http::CodecClient::Type::HTTP3) {
return;
}
autonomous_upstream_ = true;
initializeOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::LoadShedPoint>(R"EOF(
name: "envoy.load_shed_points.hcm_ondata_creating_codec"
triggers:
- name: "envoy.resource_monitors.testonly.fake_resource_monitor"
threshold:
value: 0.90
)EOF"));
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
updateResource(0.95);
test_server_->waitForGaugeEq(
"overload.envoy.load_shed_points.hcm_ondata_creating_codec.scale_percent", 100);
auto encoder_decoder = codec_client_->startRequest(default_request_headers_);
test_server_->waitForCounterEq("http.config_test.downstream_rq_overload_close", 1);
ASSERT_TRUE(codec_client_->waitForDisconnect());
updateResource(0.80);
test_server_->waitForGaugeEq(
"overload.envoy.load_shed_points.hcm_ondata_creating_codec.scale_percent", 0);
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
auto response = codec_client_->makeHeaderOnlyRequest(default_request_headers_);
test_server_->waitForCounterEq("http.config_test.downstream_rq_overload_close", 1);
ASSERT_TRUE(response->waitForEndStream());
EXPECT_EQ(response->headers().getStatusValue(), "200");
}
TEST_P(LoadShedPointIntegrationTest, HttpDownstreamFilterLoadShed) {
autonomous_upstream_ = true;
initializeOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::LoadShedPoint>(R"EOF(
name: "envoy.load_shed_points.http_downstream_filter_check"
triggers:
- name: "envoy.resource_monitors.testonly.fake_resource_monitor"
threshold:
value: 0.90
)EOF"));
codec_client_ = makeHttpConnection(makeClientConnection((lookupPort("http"))));
// Put envoy in overloaded state and check that it sends a local reply from router.
updateResource(0.95);
test_server_->waitForGaugeEq(
"overload.envoy.load_shed_points.http_downstream_filter_check.scale_percent", 100);
auto response_with_local_reply = codec_client_->makeHeaderOnlyRequest(default_request_headers_);
ASSERT_TRUE(response_with_local_reply->waitForEndStream());
EXPECT_EQ(response_with_local_reply->headers().getStatusValue(), "503");
updateResource(0.80);
test_server_->waitForGaugeEq(
"overload.envoy.load_shed_points.http_downstream_filter_check.scale_percent", 0);
auto response_that_is_proxied = codec_client_->makeHeaderOnlyRequest(default_request_headers_);
ASSERT_TRUE(response_that_is_proxied->waitForEndStream());
EXPECT_EQ(response_that_is_proxied->headers().getStatusValue(), "200");
}
TEST_P(LoadShedPointIntegrationTest, HttpConnManagerDoesNotShedLoadWhenBypassed) {
// QUIC uses UDP, not TCP.
if (downstreamProtocol() == Http::CodecClient::Type::HTTP3) {
return;
}
autonomous_upstream_ = true;
initializeWithBypassOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::LoadShedPoint>(R"EOF(
name: "envoy.load_shed_points.http_connection_manager_decode_headers"
triggers:
- name: "envoy.resource_monitors.testonly.fake_resource_monitor"
threshold:
value: 0.90
)EOF"));
// Put envoy in overloaded state and check that
// the listener that bypasses the overload manager does not reject the new request.
updateResource(0.95);
test_server_->waitForGaugeEq(
"overload.envoy.load_shed_points.http_connection_manager_decode_headers.scale_percent", 100);
auto codec_client = makeHttpConnection(makeClientConnection((lookupPort("http"))));
auto response_that_is_proxied = codec_client->makeHeaderOnlyRequest(default_request_headers_);
ASSERT_TRUE(response_that_is_proxied->waitForEndStream());
EXPECT_EQ(response_that_is_proxied->headers().getStatusValue(), "200");
codec_client->close();
// Check that the other listener gets its requests rejected.
auto codec_client2 = makeHttpConnection(makeClientConnection((lookupPort("http_2"))));
auto response_gets_local_reply = codec_client2->makeHeaderOnlyRequest(default_request_headers_);
ASSERT_TRUE(response_gets_local_reply->waitForEndStream());
EXPECT_EQ(response_gets_local_reply->headers().getStatusValue(), "503");
codec_client2->close();
}
TEST_P(LoadShedPointIntegrationTest, ListenerAcceptDoesNotShedLoadWhenBypassed) {
// QUIC uses UDP, not TCP.
if (downstreamProtocol() == Http::CodecClient::Type::HTTP3) {
return;
}
autonomous_upstream_ = true;
initializeWithBypassOverloadManager(
TestUtility::parseYaml<envoy::config::overload::v3::LoadShedPoint>(R"EOF(
name: "envoy.load_shed_points.tcp_listener_accept"
triggers:
- name: "envoy.resource_monitors.testonly.fake_resource_monitor"
threshold: