Protect timeout feature under a flag and added testing.

src/core/ext/xds/xds_api.cc

@@ -88,6 +88,17 @@
 
 namespace grpc_core {
 
+// TODO (donnadionne): Check to see if timeout is enabled, this will be
+// removed once timeout feature is fully integration-tested and enabled by
+// default.
+bool XdsTimeoutEnabled() {
+  char* value = gpr_getenv("GRPC_XDS_EXPERIMENTAL_ENABLE_TIMEOUT");
+  bool parsed_value;
+  bool parse_succeeded = gpr_parse_bool_value(value, &parsed_value);
+  gpr_free(value);
+  return parse_succeeded && parsed_value;
+}
+
 //
 // XdsApi::Route::Matchers::PathMatcher
 //
@@ -1129,7 +1140,7 @@ grpc_error* RouteActionParse(const envoy_config_route_v3_Route* route_msg,
     // No cluster or weighted_clusters found in RouteAction, ignore this route.
     *ignore_route = true;
   }
-  if (!*ignore_route) {
+  if (XdsTimeoutEnabled() && !*ignore_route) {
     const envoy_config_route_v3_RouteAction_MaxStreamDuration*
         max_stream_duration =
             envoy_config_route_v3_RouteAction_max_stream_duration(route_action);
@@ -1278,18 +1289,21 @@ grpc_error* LdsResponseParse(
       return GRPC_ERROR_CREATE_FROM_STATIC_STRING(
           "Could not parse HttpConnectionManager config from ApiListener");
     }
-    // Obtain max_stream_duration from Http Protocol Options.
-    const envoy_config_core_v3_HttpProtocolOptions* options =
-        envoy_extensions_filters_network_http_connection_manager_v3_HttpConnectionManager_common_http_protocol_options(
-            http_connection_manager);
-    if (options != nullptr) {
-      const google_protobuf_Duration* duration =
-          envoy_config_core_v3_HttpProtocolOptions_max_stream_duration(options);
-      if (duration != nullptr) {
-        lds_update.http_max_stream_duration.seconds =
-            google_protobuf_Duration_seconds(duration);
-        lds_update.http_max_stream_duration.nanos =
-            google_protobuf_Duration_nanos(duration);
+    if (XdsTimeoutEnabled()) {
+      // Obtain max_stream_duration from Http Protocol Options.
+      const envoy_config_core_v3_HttpProtocolOptions* options =
+          envoy_extensions_filters_network_http_connection_manager_v3_HttpConnectionManager_common_http_protocol_options(
+              http_connection_manager);
+      if (options != nullptr) {
+        const google_protobuf_Duration* duration =
+            envoy_config_core_v3_HttpProtocolOptions_max_stream_duration(
+                options);
+        if (duration != nullptr) {
+          lds_update.http_max_stream_duration.seconds =
+              google_protobuf_Duration_seconds(duration);
+          lds_update.http_max_stream_duration.nanos =
+              google_protobuf_Duration_nanos(duration);
+        }
       }
     }
     // Found inlined route_config. Parse it to find the cluster_name.

test/cpp/end2end/xds_end2end_test.cc

@@ -4251,6 +4251,7 @@ TEST_P(LdsRdsTest, XdsRoutingApplyXdsTimeout) {
   // TODO(https://github.com/grpc/grpc/issues/24549): TSAN won't work here.
   if (BuiltUnderAsan() || BuiltUnderTsan()) return;
 
+  gpr_setenv("GRPC_XDS_EXPERIMENTAL_ENABLE_TIMEOUT", "true");
   const int64_t kTimeoutNano = 500000000;
   const int64_t kTimeoutGrpcTimeoutHeaderMaxSecond = 1;
   const int64_t kTimeoutMaxStreamDurationSecond = 2;
@@ -4393,9 +4394,100 @@ TEST_P(LdsRdsTest, XdsRoutingApplyXdsTimeout) {
             kTimeoutHttpMaxStreamDurationSecond * 1000000000 + kTimeoutNano);
   EXPECT_LT(ellapsed_nano_seconds.count(),
             kTimeoutApplicationSecond * 1000000000);
+  gpr_unsetenv("GRPC_XDS_EXPERIMENTAL_ENABLE_TIMEOUT");
+}
+
+TEST_P(LdsRdsTest, XdsRoutingXdsTimeoutDisabled) {
+  const int64_t kTimeoutMillis = 500;
+  const int64_t kTimeoutNano = kTimeoutMillis * 1000000;
+  const int64_t kTimeoutGrpcTimeoutHeaderMaxSecond = 1;
+  const int64_t kTimeoutApplicationSecond = 4;
+  SetNextResolution({});
+  SetNextResolutionForLbChannelAllBalancers();
+  // Populate new EDS resources.
+  AdsServiceImpl::EdsResourceArgs args({
+      {"locality0", {g_port_saver->GetPort()}},
+  });
+  balancers_[0]->ads_service()->SetEdsResource(BuildEdsResource(args));
+  RouteConfiguration new_route_config =
+      balancers_[0]->ads_service()->default_route_config();
+  // route 1: Set grpc_timeout_header_max of 1.5
+  auto* route1 = new_route_config.mutable_virtual_hosts(0)->mutable_routes(0);
+  auto* max_stream_duration =
+      route1->mutable_route()->mutable_max_stream_duration();
+  auto* duration = max_stream_duration->mutable_grpc_timeout_header_max();
+  duration->set_seconds(kTimeoutGrpcTimeoutHeaderMaxSecond);
+  duration->set_nanos(kTimeoutNano);
+  SetRouteConfiguration(0, new_route_config);
+  // Test grpc_timeout_header_max of 1.5 seconds is not applied
+  gpr_timespec t0 = gpr_now(GPR_CLOCK_MONOTONIC);
+  gpr_timespec est_timeout_time = gpr_time_add(
+      t0, gpr_time_from_millis(
+              kTimeoutGrpcTimeoutHeaderMaxSecond * 1000 + kTimeoutMillis,
+              GPR_TIMESPAN));
+  CheckRpcSendFailure(1,
+                      RpcOptions()
+                          .set_rpc_service(SERVICE_ECHO1)
+                          .set_rpc_method(METHOD_ECHO1)
+                          .set_wait_for_ready(true)
+                          .set_timeout_ms(kTimeoutApplicationSecond * 1000),
+                      StatusCode::DEADLINE_EXCEEDED);
+  gpr_timespec timeout_time = gpr_now(GPR_CLOCK_MONOTONIC);
+  EXPECT_GT(gpr_time_cmp(timeout_time, est_timeout_time), 0);
+}
+
+TEST_P(LdsRdsTest, XdsRoutingHttpTimeoutDisabled) {
+  const int64_t kTimeoutMillis = 500;
+  const int64_t kTimeoutNano = kTimeoutMillis * 1000000;
+  const int64_t kTimeoutHttpMaxStreamDurationSecond = 3;
+  const int64_t kTimeoutApplicationSecond = 4;
+  SetNextResolution({});
+  SetNextResolutionForLbChannelAllBalancers();
+  // Populate new EDS resources.
+  AdsServiceImpl::EdsResourceArgs args({
+      {"locality0", {g_port_saver->GetPort()}},
+  });
+  HttpConnectionManager http_connection_manager;
+  // Set up HTTP max_stream_duration of 3.5 seconds
+  auto* duration =
+      http_connection_manager.mutable_common_http_protocol_options()
+          ->mutable_max_stream_duration();
+  duration->set_seconds(kTimeoutHttpMaxStreamDurationSecond);
+  duration->set_nanos(kTimeoutNano);
+  RouteConfiguration new_route_config =
+      balancers_[0]->ads_service()->default_route_config();
+  if (GetParam().enable_rds_testing()) {
+    auto* rds = http_connection_manager.mutable_rds();
+    rds->set_route_config_name(kDefaultRouteConfigurationName);
+    rds->mutable_config_source()->mutable_ads();
+    auto listener = balancers_[0]->ads_service()->default_listener();
+    listener.mutable_api_listener()->mutable_api_listener()->PackFrom(
+        http_connection_manager);
+    balancers_[0]->ads_service()->SetLdsResource(listener);
+    SetRouteConfiguration(0, new_route_config);
+  } else {
+    *http_connection_manager.mutable_route_config() = new_route_config;
+    auto listener = balancers_[0]->ads_service()->default_listener();
+    listener.mutable_api_listener()->mutable_api_listener()->PackFrom(
+        http_connection_manager);
+    balancers_[0]->ads_service()->SetLdsResource(listener);
+  }
+  // Test http_stream_duration of 3.5 seconds is not applied
+  auto t0 = gpr_now(GPR_CLOCK_MONOTONIC);
+  auto est_timeout_time = gpr_time_add(
+      t0, gpr_time_from_millis(
+              kTimeoutHttpMaxStreamDurationSecond * 1000 + kTimeoutMillis,
+              GPR_TIMESPAN));
+  CheckRpcSendFailure(1,
+                      RpcOptions().set_wait_for_ready(true).set_timeout_ms(
+                          kTimeoutApplicationSecond * 1000),
+                      StatusCode::DEADLINE_EXCEEDED);
+  auto timeout_time = gpr_now(GPR_CLOCK_MONOTONIC);
+  EXPECT_GT(gpr_time_cmp(timeout_time, est_timeout_time), 0);
 }
 
 TEST_P(LdsRdsTest, XdsRoutingApplyApplicationTimeoutWhenXdsTimeoutExplicit0) {
+  gpr_setenv("GRPC_XDS_EXPERIMENTAL_ENABLE_TIMEOUT", "true");
   const int64_t kTimeoutNano = 500000000;
   const int64_t kTimeoutMaxStreamDurationSecond = 2;
   const int64_t kTimeoutHttpMaxStreamDurationSecond = 3;
@@ -4505,9 +4597,11 @@ TEST_P(LdsRdsTest, XdsRoutingApplyApplicationTimeoutWhenXdsTimeoutExplicit0) {
       system_clock::now() - t0);
   EXPECT_GT(ellapsed_nano_seconds.count(),
             kTimeoutApplicationSecond * 1000000000);
+  gpr_unsetenv("GRPC_XDS_EXPERIMENTAL_ENABLE_TIMEOUT");
 }
 
 TEST_P(LdsRdsTest, XdsRoutingApplyApplicationTimeoutWhenHttpTimeoutExplicit0) {
+  gpr_setenv("GRPC_XDS_EXPERIMENTAL_ENABLE_TIMEOUT", "true");
   const int64_t kTimeoutApplicationSecond = 4;
   SetNextResolution({});
   SetNextResolutionForLbChannelAllBalancers();
@@ -4552,11 +4646,13 @@ TEST_P(LdsRdsTest, XdsRoutingApplyApplicationTimeoutWhenHttpTimeoutExplicit0) {
                                                            t0);
   EXPECT_GT(ellapsed_nano_seconds.count(),
             kTimeoutApplicationSecond * 1000000000);
+  gpr_unsetenv("GRPC_XDS_EXPERIMENTAL_ENABLE_TIMEOUT");
 }
 
 // Test to ensure application-specified deadline won't be affected when
 // the xDS config does not specify a timeout.
 TEST_P(LdsRdsTest, XdsRoutingWithOnlyApplicationTimeout) {
+  gpr_setenv("GRPC_XDS_EXPERIMENTAL_ENABLE_TIMEOUT", "true");
   const int64_t kTimeoutApplicationSecond = 4;
   SetNextResolution({});
   SetNextResolutionForLbChannelAllBalancers();
@@ -4575,6 +4671,7 @@ TEST_P(LdsRdsTest, XdsRoutingWithOnlyApplicationTimeout) {
                                                            t0);
   EXPECT_GT(ellapsed_nano_seconds.count(),
             kTimeoutApplicationSecond * 1000000000);
+  gpr_unsetenv("GRPC_XDS_EXPERIMENTAL_ENABLE_TIMEOUT");
 }
 
 TEST_P(LdsRdsTest, XdsRoutingHeadersMatching) {