router: support random value for cluster specifier plugin (#39979)

wbpcode · web-flow · commit cd2f72c653c8 · 2025-06-27T14:40:43.000-04:00
Now, the cluster specifier plugin could also use the random value to select cluster. Risk Level: low. Testing: n/a. Docs Changes: n/a. Release Notes: n/a. Platform Specific Features: [Optional Runtime guard:] [Optional Fixes #Issue] [Optional Fixes commit #PR or SHA] [Optional Deprecated:] [Optional [API Considerations](https://github.com/envoyproxy/envoy/blob/main/api/review_checklist.md):] --------- Signed-off-by: wangbaiping(wbpcode) <wbphub@gmail.com>
diff --git a/contrib/golang/router/cluster_specifier/source/BUILD b/contrib/golang/router/cluster_specifier/source/BUILD
@@ -25,7 +25,7 @@ envoy_cc_library(
         "//envoy/router:cluster_specifier_plugin_interface",
         "//source/common/common:utility_lib",
         "//source/common/http:utility_lib",
-        "//source/common/router:config_lib",
+        "//source/common/router:delegating_route_lib",
         "@envoy_api//contrib/envoy/extensions/router/cluster_specifier/golang/v3alpha:pkg_cc_proto",
     ],
 )
diff --git a/contrib/golang/router/cluster_specifier/source/golang_cluster_specifier.cc b/contrib/golang/router/cluster_specifier/source/golang_cluster_specifier.cc
@@ -2,7 +2,7 @@
 
 #include <chrono>
 
-#include "source/common/router/config_impl.h"
+#include "source/common/router/delegating_route_impl.h"
 
 namespace Envoy {
 namespace Router {
@@ -46,7 +46,8 @@ ClusterConfig::ClusterConfig(const GolangClusterProto& config)
 
 RouteConstSharedPtr GolangClusterSpecifierPlugin::route(RouteEntryAndRouteConstSharedPtr parent,
                                                         const Http::RequestHeaderMap& header,
-                                                        const StreamInfo::StreamInfo&) const {
+                                                        const StreamInfo::StreamInfo&,
+                                                        uint64_t) const {
   int buffer_len = 256;
   std::string buffer;
   std::string cluster;
@@ -77,7 +78,7 @@ RouteConstSharedPtr GolangClusterSpecifierPlugin::route(RouteEntryAndRouteConstS
     }
   }
 
-  return std::make_shared<RouteEntryImplBase::DynamicRouteEntry>(std::move(parent), cluster);
+  return std::make_shared<Router::DynamicRouteEntry>(std::move(parent), std::move(cluster));
 }
 
 void GolangClusterSpecifierPlugin::log(absl::string_view& msg) const {
diff --git a/contrib/golang/router/cluster_specifier/source/golang_cluster_specifier.h b/contrib/golang/router/cluster_specifier/source/golang_cluster_specifier.h
@@ -38,7 +38,8 @@ class GolangClusterSpecifierPlugin : public ClusterSpecifierPlugin,
 
   RouteConstSharedPtr route(RouteEntryAndRouteConstSharedPtr parent,
                             const Http::RequestHeaderMap& header,
-                            const StreamInfo::StreamInfo& stream_info) const override;
+                            const StreamInfo::StreamInfo& stream_info,
+                            uint64_t random) const override;
 
   void log(absl::string_view& msg) const;
 
diff --git a/envoy/router/cluster_specifier_plugin.h b/envoy/router/cluster_specifier_plugin.h
@@ -25,11 +25,13 @@ class ClusterSpecifierPlugin {
    * @param parent related route.
    * @param headers request headers.
    * @param stream_info stream info of the downstream request.
+   * @param random random value for cluster selection.
    * @return RouteConstSharedPtr final route with specific cluster.
    */
   virtual RouteConstSharedPtr route(RouteEntryAndRouteConstSharedPtr parent,
                                     const Http::RequestHeaderMap& headers,
-                                    const StreamInfo::StreamInfo& stream_info) const PURE;
+                                    const StreamInfo::StreamInfo& stream_info,
+                                    uint64_t random) const PURE;
 };
 
 using ClusterSpecifierPluginSharedPtr = std::shared_ptr<ClusterSpecifierPlugin>;
diff --git a/source/common/router/config_impl.cc b/source/common/router/config_impl.cc
@@ -174,7 +174,7 @@ getHeaderParsers(const HeaderParser* global_route_config_header_parser,
 class NullClusterSpecifierPlugin : public ClusterSpecifierPlugin {
 public:
   RouteConstSharedPtr route(RouteEntryAndRouteConstSharedPtr, const Http::RequestHeaderMap&,
-                            const StreamInfo::StreamInfo&) const override {
+                            const StreamInfo::StreamInfo&, uint64_t) const override {
     return nullptr;
   }
 };
@@ -1390,7 +1390,8 @@ RouteConstSharedPtr RouteEntryImplBase::clusterEntry(const Http::RequestHeaderMa
       // TODO(wbpcode): make the weighted clusters an implementation of the
       // cluster specifier plugin.
       ASSERT(cluster_specifier_plugin_ != nullptr);
-      return cluster_specifier_plugin_->route(shared_from_this(), headers, stream_info);
+      return cluster_specifier_plugin_->route(shared_from_this(), headers, stream_info,
+                                              random_value);
     }
   }
   return pickWeightedCluster(headers, random_value);
diff --git a/source/common/router/header_cluster_specifier.cc b/source/common/router/header_cluster_specifier.cc
@@ -10,7 +10,8 @@ HeaderClusterSpecifierPlugin::HeaderClusterSpecifierPlugin(absl::string_view clu
 
 RouteConstSharedPtr HeaderClusterSpecifierPlugin::route(RouteEntryAndRouteConstSharedPtr parent,
                                                         const Http::RequestHeaderMap& headers,
-                                                        const StreamInfo::StreamInfo&) const {
+                                                        const StreamInfo::StreamInfo&,
+                                                        uint64_t) const {
 
   const auto entry = headers.get(cluster_header_);
   absl::string_view cluster_name;
diff --git a/source/common/router/header_cluster_specifier.h b/source/common/router/header_cluster_specifier.h
@@ -11,7 +11,8 @@ class HeaderClusterSpecifierPlugin : public ClusterSpecifierPlugin {
 
   RouteConstSharedPtr route(RouteEntryAndRouteConstSharedPtr parent,
                             const Http::RequestHeaderMap& headers,
-                            const StreamInfo::StreamInfo& stream_info) const override;
+                            const StreamInfo::StreamInfo& stream_info,
+                            uint64_t random) const override;
 
 private:
   const Http::LowerCaseString cluster_header_;
diff --git a/source/extensions/router/cluster_specifiers/lua/BUILD b/source/extensions/router/cluster_specifiers/lua/BUILD
@@ -24,6 +24,7 @@ envoy_cc_library(
         "//source/common/common:utility_lib",
         "//source/common/http:utility_lib",
         "//source/common/router:config_lib",
+        "//source/common/router:delegating_route_lib",
         "//source/common/runtime:runtime_features_lib",
         "//source/extensions/filters/common/lua:lua_lib",
         "//source/extensions/filters/common/lua:wrappers_lib",
diff --git a/source/extensions/router/cluster_specifiers/lua/lua_cluster_specifier.cc b/source/extensions/router/cluster_specifiers/lua/lua_cluster_specifier.cc
@@ -1,6 +1,7 @@
 #include "source/extensions/router/cluster_specifiers/lua/lua_cluster_specifier.h"
 
-#include "source/common/router/config_impl.h"
+#include "source/common/http/header_utility.h"
+#include "source/common/router/delegating_route_impl.h"
 
 namespace Envoy {
 namespace Extensions {
@@ -123,10 +124,10 @@ std::string LuaClusterSpecifierPlugin::startLua(const Http::HeaderMap& headers)
 Envoy::Router::RouteConstSharedPtr
 LuaClusterSpecifierPlugin::route(Envoy::Router::RouteEntryAndRouteConstSharedPtr parent,
                                  const Http::RequestHeaderMap& headers,
-                                 const StreamInfo::StreamInfo&) const {
-  return std::make_shared<Envoy::Router::RouteEntryImplBase::DynamicRouteEntry>(std::move(parent),
-                                                                                startLua(headers));
+                                 const StreamInfo::StreamInfo&, uint64_t) const {
+  return std::make_shared<Envoy::Router::DynamicRouteEntry>(std::move(parent), startLua(headers));
 }
+
 } // namespace Lua
 } // namespace Router
 } // namespace Extensions
diff --git a/source/extensions/router/cluster_specifiers/lua/lua_cluster_specifier.h b/source/extensions/router/cluster_specifiers/lua/lua_cluster_specifier.h
@@ -134,10 +134,9 @@ class LuaClusterSpecifierPlugin : public Envoy::Router::ClusterSpecifierPlugin,
                                   Logger::Loggable<Logger::Id::lua> {
 public:
   LuaClusterSpecifierPlugin(LuaClusterSpecifierConfigSharedPtr config);
-  Envoy::Router::RouteConstSharedPtr
-  route(Envoy::Router::RouteEntryAndRouteConstSharedPtr parent,
-        const Http::RequestHeaderMap& header,
-        const StreamInfo::StreamInfo& stream_info) const override;
+  Envoy::Router::RouteConstSharedPtr route(Envoy::Router::RouteEntryAndRouteConstSharedPtr parent,
+                                           const Http::RequestHeaderMap& header,
+                                           const StreamInfo::StreamInfo&, uint64_t) const override;
 
 private:
   std::string startLua(const Http::HeaderMap& headers) const;
diff --git a/source/extensions/router/cluster_specifiers/matcher/matcher_cluster_specifier.cc b/source/extensions/router/cluster_specifiers/matcher/matcher_cluster_specifier.cc
@@ -56,7 +56,7 @@ class MatcherRouteEntry : public Envoy::Router::DelegatingRouteEntry {
 Envoy::Router::RouteConstSharedPtr
 MatcherClusterSpecifierPlugin::route(Envoy::Router::RouteEntryAndRouteConstSharedPtr parent,
                                      const Http::RequestHeaderMap& headers,
-                                     const StreamInfo::StreamInfo& stream_info) const {
+                                     const StreamInfo::StreamInfo& stream_info, uint64_t) const {
   auto matcher_route = std::make_shared<MatcherRouteEntry>(parent, match_tree_);
   matcher_route->refreshRouteCluster(headers, stream_info);
   return matcher_route;
diff --git a/source/extensions/router/cluster_specifiers/matcher/matcher_cluster_specifier.h b/source/extensions/router/cluster_specifiers/matcher/matcher_cluster_specifier.h
@@ -58,10 +58,10 @@ class MatcherClusterSpecifierPlugin : public Envoy::Router::ClusterSpecifierPlug
   MatcherClusterSpecifierPlugin(
       Envoy::Matcher::MatchTreeSharedPtr<Http::HttpMatchingData> match_tree)
       : match_tree_(match_tree) {}
-  Envoy::Router::RouteConstSharedPtr
-  route(Envoy::Router::RouteEntryAndRouteConstSharedPtr parent,
-        const Http::RequestHeaderMap& headers,
-        const StreamInfo::StreamInfo& stream_info) const override;
+  Envoy::Router::RouteConstSharedPtr route(Envoy::Router::RouteEntryAndRouteConstSharedPtr parent,
+                                           const Http::RequestHeaderMap& headers,
+                                           const StreamInfo::StreamInfo& stream_info,
+                                           uint64_t) const override;
 
 private:
   Envoy::Matcher::MatchTreeSharedPtr<Http::HttpMatchingData> match_tree_;
diff --git a/test/common/router/config_impl_integration_test.cc b/test/common/router/config_impl_integration_test.cc
@@ -25,8 +25,8 @@ class FakeClusterSpecifierPluginFactoryConfig : public ClusterSpecifierPluginFac
     FakeClusterSpecifierPlugin(absl::string_view cluster) : cluster_name_(cluster) {}
 
     RouteConstSharedPtr route(RouteEntryAndRouteConstSharedPtr parent,
-                              const Http::RequestHeaderMap&,
-                              const StreamInfo::StreamInfo&) const override {
+                              const Http::RequestHeaderMap&, const StreamInfo::StreamInfo&,
+                              uint64_t) const override {
       ASSERT(dynamic_cast<const RouteEntryImplBase*>(parent.get()) != nullptr);
       return std::make_shared<RouteEntryImplBase::DynamicRouteEntry>(
           dynamic_cast<const RouteEntryImplBase*>(parent.get()), parent, cluster_name_);
diff --git a/test/common/router/config_impl_test.cc b/test/common/router/config_impl_test.cc
@@ -3669,7 +3669,7 @@ TEST_F(RouteMatcherTest, InlineClusterSpecifierPlugin) {
 
   auto mock_route = std::make_shared<NiceMock<MockRoute>>();
 
-  EXPECT_CALL(*mock_cluster_specifier_plugin, route(_, _, _)).WillOnce(Return(mock_route));
+  EXPECT_CALL(*mock_cluster_specifier_plugin, route(_, _, _, _)).WillOnce(Return(mock_route));
 
   EXPECT_EQ(mock_route.get(), config.route(genHeaders("some_cluster", "/foo", "GET"), 0).get());
 }
@@ -3799,10 +3799,10 @@ TEST_F(RouteMatcherTest, ClusterSpecifierPlugin) {
 
   auto mock_route = std::make_shared<NiceMock<MockRoute>>();
 
-  EXPECT_CALL(*mock_cluster_specifier_plugin_2, route(_, _, _)).WillOnce(Return(mock_route));
+  EXPECT_CALL(*mock_cluster_specifier_plugin_2, route(_, _, _, _)).WillOnce(Return(mock_route));
   EXPECT_EQ(mock_route.get(), config.route(genHeaders("some_cluster", "/foo", "GET"), 0).get());
 
-  EXPECT_CALL(*mock_cluster_specifier_plugin_3, route(_, _, _)).WillOnce(Return(mock_route));
+  EXPECT_CALL(*mock_cluster_specifier_plugin_3, route(_, _, _, _)).WillOnce(Return(mock_route));
   EXPECT_EQ(mock_route.get(), config.route(genHeaders("some_cluster", "/bar", "GET"), 0).get());
 }
 
@@ -5025,7 +5025,8 @@ TEST_F(RouteMatcherTest, InvalidRetryBackOff) {
 )EOF";
 
   factory_context_.cluster_manager_.initializeClusters({"backoff"}, {});
-  TestConfigImpl(parseRouteConfigurationFromYaml(yaml), factory_context_, true, creation_status_);
+  TestConfigImpl config(parseRouteConfigurationFromYaml(yaml), factory_context_, true,
+                        creation_status_);
   EXPECT_EQ(creation_status_.message(),
             "retry_policy.max_interval must greater than or equal to the base_interval");
 }
diff --git a/test/extensions/router/cluster_specifiers/lua/lua_cluster_specifier_test.cc b/test/extensions/router/cluster_specifiers/lua/lua_cluster_specifier_test.cc
@@ -78,15 +78,15 @@ TEST_F(LuaClusterSpecifierPluginTest, NormalLuaCode) {
   auto mock_route = std::make_shared<NiceMock<Envoy::Router::MockRoute>>();
   {
     Http::TestRequestHeaderMapImpl headers{{":path", "/"}, {"header_key", "fake"}};
-    auto route = plugin_->route(mock_route, headers, stream_info_);
+    auto route = plugin_->route(mock_route, headers, stream_info_, 0);
     EXPECT_EQ("fake_service", route->routeEntry()->clusterName());
     // Force the runtime to gc and destroy all the userdata.
     config_->perLuaCodeSetup()->runtimeGC();
   }
 
   {
     Http::TestRequestHeaderMapImpl headers{{":path", "/"}, {"header_key", "header_value"}};
-    auto route = plugin_->route(mock_route, headers, stream_info_);
+    auto route = plugin_->route(mock_route, headers, stream_info_, 0);
     EXPECT_EQ("web_service", route->routeEntry()->clusterName());
     // Force the runtime to gc and destroy all the userdata.
     config_->perLuaCodeSetup()->runtimeGC();
@@ -100,15 +100,15 @@ TEST_F(LuaClusterSpecifierPluginTest, ErrorLuaCode) {
   auto mock_route = std::make_shared<NiceMock<Envoy::Router::MockRoute>>();
   {
     Http::TestRequestHeaderMapImpl headers{{":path", "/"}, {"header_key", "fake"}};
-    auto route = plugin_->route(mock_route, headers, stream_info_);
+    auto route = plugin_->route(mock_route, headers, stream_info_, 0);
     EXPECT_EQ("default_service", route->routeEntry()->clusterName());
     // Force the runtime to gc and destroy all the userdata.
     config_->perLuaCodeSetup()->runtimeGC();
   }
 
   {
     Http::TestRequestHeaderMapImpl headers{{":path", "/"}, {"header_key", "header_value"}};
-    auto route = plugin_->route(mock_route, headers, stream_info_);
+    auto route = plugin_->route(mock_route, headers, stream_info_, 0);
     EXPECT_EQ("default_service", route->routeEntry()->clusterName());
     // Force the runtime to gc and destroy all the userdata.
     config_->perLuaCodeSetup()->runtimeGC();
@@ -122,15 +122,15 @@ TEST_F(LuaClusterSpecifierPluginTest, ReturnTypeNotStringLuaCode) {
   auto mock_route = std::make_shared<NiceMock<Envoy::Router::MockRoute>>();
   {
     Http::TestRequestHeaderMapImpl headers{{":path", "/"}, {"header_key", "fake"}};
-    auto route = plugin_->route(mock_route, headers, stream_info_);
+    auto route = plugin_->route(mock_route, headers, stream_info_, 0);
     EXPECT_EQ("fake_service", route->routeEntry()->clusterName());
     // Force the runtime to gc and destroy all the userdata.
     config_->perLuaCodeSetup()->runtimeGC();
   }
 
   {
     Http::TestRequestHeaderMapImpl headers{{":path", "/"}, {"header_key", "header_value"}};
-    auto route = plugin_->route(mock_route, headers, stream_info_);
+    auto route = plugin_->route(mock_route, headers, stream_info_, 0);
     EXPECT_EQ("default_service", route->routeEntry()->clusterName());
     // Force the runtime to gc and destroy all the userdata.
     config_->perLuaCodeSetup()->runtimeGC();
@@ -167,7 +167,7 @@ TEST_F(LuaClusterSpecifierPluginTest, GetClustersBadArg) {
 
   auto mock_route = std::make_shared<NiceMock<Envoy::Router::MockRoute>>();
   Http::TestRequestHeaderMapImpl headers{{":path", "/"}};
-  auto route = plugin_->route(mock_route, headers, stream_info_);
+  auto route = plugin_->route(mock_route, headers, stream_info_, 0);
   EXPECT_EQ("default_service", route->routeEntry()->clusterName());
 }
 
@@ -192,7 +192,7 @@ TEST_F(LuaClusterSpecifierPluginTest, GetClustersMissing) {
 
   auto mock_route = std::make_shared<NiceMock<Envoy::Router::MockRoute>>();
   Http::TestRequestHeaderMapImpl headers{{":path", "/"}};
-  auto route = plugin_->route(mock_route, headers, stream_info_);
+  auto route = plugin_->route(mock_route, headers, stream_info_, 0);
   EXPECT_EQ("nil", route->routeEntry()->clusterName());
 }
 
@@ -242,7 +242,7 @@ TEST_F(LuaClusterSpecifierPluginTest, ClusterMethods) {
 
   auto mock_route = std::make_shared<NiceMock<Envoy::Router::MockRoute>>();
   Http::TestRequestHeaderMapImpl headers{{":path", "/"}};
-  auto route = plugin_->route(mock_route, headers, stream_info_);
+  auto route = plugin_->route(mock_route, headers, stream_info_, 0);
   EXPECT_EQ("pass", route->routeEntry()->clusterName());
 
   // Force the runtime to gc and destroy all the userdata.
@@ -279,7 +279,7 @@ TEST_F(LuaClusterSpecifierPluginTest, ClusterRef) {
 
   auto mock_route = std::make_shared<NiceMock<Envoy::Router::MockRoute>>();
   Http::TestRequestHeaderMapImpl headers{{":path", "/"}};
-  auto route = plugin_->route(mock_route, headers, stream_info_);
+  auto route = plugin_->route(mock_route, headers, stream_info_, 0);
   EXPECT_EQ("pass", route->routeEntry()->clusterName());
 
   // Force the runtime to gc and destroy all the userdata.
@@ -310,7 +310,7 @@ TEST_F(LuaClusterSpecifierPluginTest, Logging) {
                                                          {"warn", "log test"},
                                                          {"error", "log test"},
                                                          {"critical", "log test"}}),
-                             { plugin_->route(mock_route, headers, stream_info_); });
+                             { plugin_->route(mock_route, headers, stream_info_, 0); });
 }
 
 } // namespace Lua
diff --git a/test/extensions/router/cluster_specifiers/matcher/matcher_cluster_specifier_test.cc b/test/extensions/router/cluster_specifiers/matcher/matcher_cluster_specifier_test.cc
@@ -116,19 +116,19 @@ TEST_F(MatcherClusterSpecifierPluginTest, NormalConfigTest) {
   auto mock_route = std::make_shared<NiceMock<Envoy::Router::MockRoute>>();
   {
     Http::TestRequestHeaderMapImpl headers{{":path", "/"}, {"env", "staging"}};
-    auto route = plugin_->route(mock_route, headers, stream_info_);
+    auto route = plugin_->route(mock_route, headers, stream_info_, 0);
     EXPECT_EQ("staging-cluster", route->routeEntry()->clusterName());
   }
 
   {
     Http::TestRequestHeaderMapImpl headers{{":path", "/"}, {"env", "prod"}};
-    auto route = plugin_->route(mock_route, headers, stream_info_);
+    auto route = plugin_->route(mock_route, headers, stream_info_, 0);
     EXPECT_EQ("prod-cluster", route->routeEntry()->clusterName());
   }
 
   {
     Http::TestRequestHeaderMapImpl headers{{":path", "/"}, {"env", "not-exist"}};
-    auto route = plugin_->route(mock_route, headers, stream_info_);
+    auto route = plugin_->route(mock_route, headers, stream_info_, 0);
     EXPECT_EQ("default-cluster", route->routeEntry()->clusterName());
   }
 }
@@ -139,13 +139,13 @@ TEST_F(MatcherClusterSpecifierPluginTest, NormalConfigWithoutDefaultCluster) {
   auto mock_route = std::make_shared<NiceMock<Envoy::Router::MockRoute>>();
   {
     Http::TestRequestHeaderMapImpl headers{{":path", "/"}, {"env", "staging"}};
-    auto route = plugin_->route(mock_route, headers, stream_info_);
+    auto route = plugin_->route(mock_route, headers, stream_info_, 0);
     EXPECT_EQ("staging-cluster", route->routeEntry()->clusterName());
   }
 
   {
     Http::TestRequestHeaderMapImpl headers{{":path", "/"}, {"env", "not-exist"}};
-    auto route = plugin_->route(mock_route, headers, stream_info_);
+    auto route = plugin_->route(mock_route, headers, stream_info_, 0);
     EXPECT_EQ("", route->routeEntry()->clusterName());
   }
 }
diff --git a/test/mocks/router/mocks.cc b/test/mocks/router/mocks.cc
@@ -217,7 +217,7 @@ MockGenericConnectionPoolCallbacks::MockGenericConnectionPoolCallbacks() {
 }
 
 MockClusterSpecifierPlugin::MockClusterSpecifierPlugin() {
-  ON_CALL(*this, route(_, _, _)).WillByDefault(Return(nullptr));
+  ON_CALL(*this, route(_, _, _, _)).WillByDefault(Return(nullptr));
 }
 
 MockClusterSpecifierPluginFactoryConfig::MockClusterSpecifierPluginFactoryConfig() {
diff --git a/test/mocks/router/mocks.h b/test/mocks/router/mocks.h
@@ -739,7 +739,7 @@ class MockClusterSpecifierPlugin : public ClusterSpecifierPlugin {
 
   MOCK_METHOD(RouteConstSharedPtr, route,
               (RouteEntryAndRouteConstSharedPtr parent, const Http::RequestHeaderMap& headers,
-               const StreamInfo::StreamInfo& stream_info),
+               const StreamInfo::StreamInfo& stream_info, uint64_t random),
               (const));
 };
 

Original file line number	Diff line number	Diff line change
`@@ -25,7 +25,7 @@ envoy_cc_library(`
`25`	`25`	`"//envoy/router:cluster_specifier_plugin_interface",`
`26`	`26`	`"//source/common/common:utility_lib",`
`27`	`27`	`"//source/common/http:utility_lib",`
`28`		`- "//source/common/router:config_lib",`
	`28`	`+ "//source/common/router:delegating_route_lib",`
`29`	`29`	`"@envoy_api//contrib/envoy/extensions/router/cluster_specifier/golang/v3alpha:pkg_cc_proto",`
`30`	`30`	`],`
`31`	`31`	`)`
Original file line number	Diff line number	Diff line change
`@@ -174,7 +174,7 @@ getHeaderParsers(const HeaderParser* global_route_config_header_parser,`
`174`	`174`	`class NullClusterSpecifierPlugin : public ClusterSpecifierPlugin {`
`175`	`175`	`public:`
`176`	`176`	`RouteConstSharedPtr route(RouteEntryAndRouteConstSharedPtr, const Http::RequestHeaderMap&,`
`177`		`- const StreamInfo::StreamInfo&) const override {`
	`177`	`+ const StreamInfo::StreamInfo&, uint64_t) const override {`
`178`	`178`	`return nullptr;`
`179`	`179`	`}`
`180`	`180`	`};`
`@@ -1390,7 +1390,8 @@ RouteConstSharedPtr RouteEntryImplBase::clusterEntry(const Http::RequestHeaderMa`
`1390`	`1390`	`// TODO(wbpcode): make the weighted clusters an implementation of the`
`1391`	`1391`	`// cluster specifier plugin.`
`1392`	`1392`	`ASSERT(cluster_specifier_plugin_ != nullptr);`
`1393`		`- return cluster_specifier_plugin_->route(shared_from_this(), headers, stream_info);`
	`1393`	`+ return cluster_specifier_plugin_->route(shared_from_this(), headers, stream_info,`
	`1394`	`+ random_value);`
`1394`	`1395`	`}`
`1395`	`1396`	`}`
`1396`	`1397`	`return pickWeightedCluster(headers, random_value);`