feat:support gateway metadata delivery

spring-cloud-tencent-dependencies/pom.xml

@@ -121,6 +121,12 @@
                 <version>${revision}</version>
             </dependency>
 
+            <dependency>
+                <groupId>com.tencent.cloud</groupId>
+                <artifactId>spring-cloud-tencent-polaris-gateway</artifactId>
+                <version>${revision}</version>
+            </dependency>
+
             <dependency>
                 <groupId>com.tencent.cloud</groupId>
                 <artifactId>spring-cloud-tencent-metadata</artifactId>

spring-cloud-tencent-examples/polaris-gateway-example/gateway-callee-service/pom.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>polaris-gateway-example</artifactId>
+        <groupId>com.tencent.cloud</groupId>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>gateway-callee-service</artifactId>
+    <name>Spring Cloud Starter Tencent Polaris Gateway Callee Example</name>
+
+    <dependencies>
+        <dependency>
+            <artifactId>spring-cloud-starter-tencent-polaris-discovery</artifactId>
+            <groupId>com.tencent.cloud</groupId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+    </dependencies>
+</project>

spring-cloud-tencent-examples/polaris-gateway-example/gateway-callee-service/src/main/java/com/tencent/cloud/polaris/gateway/example/callee/GatewayCalleeApplication.java

@@ -0,0 +1,33 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed
+ * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+
+package com.tencent.cloud.polaris.gateway.example.callee;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * @author Haotian Zhang
+ */
+@SpringBootApplication
+public class GatewayCalleeApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(GatewayCalleeApplication.class, args);
+    }
+
+}

spring-cloud-tencent-examples/polaris-gateway-example/gateway-callee-service/src/main/java/com/tencent/cloud/polaris/gateway/example/callee/GatewayCalleeController.java

@@ -0,0 +1,62 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed
+ * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+
+package com.tencent.cloud.polaris.gateway.example.callee;
+
+import com.tencent.cloud.metadata.constant.MetadataConstant;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.web.bind.annotation.RequestHeader;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.io.UnsupportedEncodingException;
+import java.net.URLDecoder;
+
+/**
+ * @author Haotian Zhang
+ */
+@RestController
+@RequestMapping("/gateway/example/callee")
+public class GatewayCalleeController {
+
+    private static Logger logger = LoggerFactory.getLogger(GatewayCalleeController.class);
+
+    /**
+     * Get info string
+     *
+     * @return 返回服务信息
+     */
+    @RequestMapping("/info")
+    public String info() {
+        return "Gateway Example Callee";
+    }
+
+    /**
+     * Get metadata in HTTP header
+     *
+     * @param metadataStr
+     * @return
+     * @throws UnsupportedEncodingException
+     */
+    @RequestMapping("/echo")
+    public String echoHeader(@RequestHeader(MetadataConstant.HeaderName.CUSTOM_METADATA) String metadataStr) throws UnsupportedEncodingException {
+        logger.info(URLDecoder.decode(metadataStr, "UTF-8"));
+        return URLDecoder.decode(metadataStr, "UTF-8");
+    }
+
+}

spring-cloud-tencent-examples/polaris-gateway-example/gateway-callee-service/src/main/resources/application.yaml

@@ -0,0 +1,9 @@
+server:
+  session-timeout: 1800
+  port: 48081
+spring:
+  application:
+    name: GatewayCalleeService
+  cloud:
+    polaris:
+      address: grpc://127.0.0.1:8081

spring-cloud-tencent-examples/polaris-gateway-example/gateway-scg-service/pom.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>polaris-gateway-example</artifactId>
+        <groupId>com.tencent.cloud</groupId>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>gateway-scg-service</artifactId>
+    <name>Spring Cloud Starter Tencent Polaris Gateway SCG Example</name>
+
+    <dependencies>
+        <dependency>
+            <artifactId>spring-cloud-starter-tencent-polaris-discovery</artifactId>
+            <groupId>com.tencent.cloud</groupId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.tencent.cloud</groupId>
+            <artifactId>spring-cloud-tencent-polaris-gateway</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-gateway</artifactId>
+        </dependency>
+    </dependencies>
+</project>

spring-cloud-tencent-examples/polaris-gateway-example/gateway-scg-service/src/main/java/com/tencent/cloud/polaris/gateway/example/scg/GatewayScgApplication.java

@@ -0,0 +1,33 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed
+ * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+
+package com.tencent.cloud.polaris.gateway.example.scg;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * @author Haotian Zhang
+ */
+@SpringBootApplication
+public class GatewayScgApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(GatewayScgApplication.class, args);
+    }
+
+}

spring-cloud-tencent-examples/polaris-gateway-example/gateway-scg-service/src/main/resources/application.yml

@@ -0,0 +1,31 @@
+server:
+  session-timeout: 1800
+  port: 48083
+spring:
+  application:
+    name: GatewayScgService
+  cloud:
+    polaris:
+      address: grpc://127.0.0.1:8081
+    tencent:
+      metadata:
+        content:
+          a: 1
+        transitive:
+          - a
+    gateway:
+      discovery:
+        locator:
+          enabled: true
+          lowerCaseServiceId: false
+      routes:
+        - id: GatewayCalleeService
+          uri: lb://GatewayCalleeService
+          predicates:
+            - Path=/GatewayCalleeService/**
+          filters:
+            - StripPrefix=1
+
+logging:
+  level:
+    org.springframework.cloud.gateway: trace

spring-cloud-tencent-examples/polaris-gateway-example/gateway-zuul-service/pom.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>polaris-gateway-example</artifactId>
+        <groupId>com.tencent.cloud</groupId>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>gateway-zuul-service</artifactId>
+    <name>Spring Cloud Starter Tencent Polaris Gateway Zuul Example</name>
+
+    <dependencies>
+        <dependency>
+            <artifactId>spring-cloud-starter-tencent-polaris-discovery</artifactId>
+            <groupId>com.tencent.cloud</groupId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.tencent.cloud</groupId>
+            <artifactId>spring-cloud-tencent-polaris-gateway</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+    </dependencies>
+
+</project>

spring-cloud-tencent-examples/polaris-gateway-example/gateway-zuul-service/src/main/java/com/tencent/cloud/polaris/gateway/example/zuul/GatewayZuulApplication.java

@@ -0,0 +1,35 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed
+ * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+
+package com.tencent.cloud.polaris.gateway.example.zuul;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.netflix.zuul.EnableZuulProxy;
+
+/**
+ * @author Haotian Zhang
+ */
+@SpringBootApplication
+@EnableZuulProxy
+public class GatewayZuulApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(GatewayZuulApplication.class, args);
+    }
+
+}

spring-cloud-tencent-examples/polaris-gateway-example/gateway-zuul-service/src/main/resources/application.yaml

@@ -0,0 +1,20 @@
+server:
+  session-timeout: 1800
+  port: 48082
+spring:
+  application:
+    name: GatewayZuulService
+  cloud:
+    polaris:
+      address: grpc://127.0.0.1:8081
+    tencent:
+      metadata:
+        content:
+          a: 1
+        transitive:
+          - a
+zuul:
+  routes:
+    GatewayCalleeService:
+      serviceId: GatewayCalleeService
+      path: /GatewayCalleeService/**

spring-cloud-tencent-examples/polaris-gateway-example/pom.xml

@@ -0,0 +1,70 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>spring-cloud-tencent-examples</artifactId>
+        <groupId>com.tencent.cloud</groupId>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>polaris-gateway-example</artifactId>
+    <packaging>pom</packaging>
+    <name>Spring Cloud Starter Tencent Polaris Gateway Example</name>
+
+    <modules>
+        <module>gateway-zuul-service</module>
+        <module>gateway-scg-service</module>
+        <module>gateway-callee-service</module>
+    </modules>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <!-- feign客户端依赖  -->
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-openfeign</artifactId>
+        </dependency>
+
+        <!-- 熔断依赖 -->
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
+        </dependency>
+
+        <!-- 负载均衡依赖-->
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
+        </dependency>
+
+        <!-- 熔断超时后，重试机制依赖-->
+        <dependency>
+            <groupId>org.springframework.retry</groupId>
+            <artifactId>spring-retry</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>repackage</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

spring-cloud-tencent-examples/pom.xml

@@ -19,6 +19,7 @@
         <module>polaris-discovery-example</module>
         <module>polaris-ratelimit-example</module>
         <module>polaris-circuitbreaker-example</module>
+        <module>polaris-gateway-example</module>
     </modules>
 
     <properties>

spring-cloud-tencent-starters/pom.xml

@@ -24,6 +24,7 @@
         <module>spring-cloud-starter-tencent-polaris-ratelimit</module>
         <module>spring-cloud-starter-tencent-polaris-circuitbreaker</module>
         <module>spring-cloud-starter-tencent-polaris-router</module>
+        <module>spring-cloud-tencent-polaris-gateway</module>
     </modules>
 
     <build>

spring-cloud-tencent-starters/spring-cloud-starter-tencent-polaris-discovery/pom.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">

spring-cloud-tencent-starters/spring-cloud-tencent-metadata/src/main/java/com/tencent/cloud/metadata/config/MetadataConfiguration.java

@@ -81,7 +81,7 @@ public class MetadataConfiguration {
 
         @Bean
         public MetadataServletFilter metadataServletFilter(MetadataLocalProperties metadataLocalProperties) {
-            return new MetadataServletFilter(metadataLocalProperties);
+            return new MetadataServletFilter();
         }
     }
 
@@ -94,7 +94,7 @@ public class MetadataConfiguration {
 
         @Bean
         public MetadataReactiveFilter metadataReactiveFilter(MetadataLocalProperties metadataLocalProperties) {
-            return new MetadataReactiveFilter(metadataLocalProperties);
+            return new MetadataReactiveFilter();
         }
     }
 

spring-cloud-tencent-starters/spring-cloud-tencent-metadata/src/main/java/com/tencent/cloud/metadata/core/filter/MetadataReactiveFilter.java

@@ -17,7 +17,6 @@
 
 package com.tencent.cloud.metadata.core.filter;
 
-import com.tencent.cloud.metadata.config.MetadataLocalProperties;
 import com.tencent.cloud.metadata.constant.MetadataConstant;
 import com.tencent.cloud.metadata.context.MetadataContextHolder;
 import com.tencent.cloud.metadata.util.JacksonUtils;
@@ -50,12 +49,6 @@ public class MetadataReactiveFilter implements WebFilter, Ordered {
 
     private static final Logger LOG = LoggerFactory.getLogger(MetadataReactiveFilter.class);
 
-    private MetadataLocalProperties metadataLocalProperties;
-
-    public MetadataReactiveFilter(MetadataLocalProperties metadataLocalProperties) {
-        this.metadataLocalProperties = metadataLocalProperties;
-    }
-
     @Override
     public int getOrder() {
         return MetadataConstant.OrderConstant.FILTER_ORDER;

spring-cloud-tencent-starters/spring-cloud-tencent-metadata/src/main/java/com/tencent/cloud/metadata/core/filter/MetadataServletFilter.java

@@ -19,7 +19,6 @@ package com.tencent.cloud.metadata.core.filter;
 
 import com.tencent.cloud.metadata.constant.MetadataConstant;
 import com.tencent.cloud.metadata.context.MetadataContextHolder;
-import com.tencent.cloud.metadata.config.MetadataLocalProperties;
 import com.tencent.cloud.metadata.util.JacksonUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -49,12 +48,6 @@ public class MetadataServletFilter extends OncePerRequestFilter {
 
     private static final Logger LOG = LoggerFactory.getLogger(MetadataServletFilter.class);
 
-    private MetadataLocalProperties metadataLocalProperties;
-
-    public MetadataServletFilter(MetadataLocalProperties metadataLocalProperties) {
-        this.metadataLocalProperties = metadataLocalProperties;
-    }
-
     @Override
     protected void doFilterInternal(HttpServletRequest httpServletRequest,
                                     HttpServletResponse httpServletResponse,

spring-cloud-tencent-starters/spring-cloud-tencent-metadata/src/main/java/com/tencent/cloud/metadata/util/JacksonUtils.java

@@ -67,7 +67,7 @@ public class JacksonUtils {
             }
             return new HashMap<>();
         } catch (JsonProcessingException e) {
-            LOG.error("Json to map failed. {}", jsonStr, e);
+            LOG.error("Json to map failed. check if the format of the json string[{}] is correct.", jsonStr, e);
             throw new RuntimeException("Json to map failed.", e);
         }
     }

spring-cloud-tencent-starters/spring-cloud-tencent-metadata/src/test/java/com/tencent/cloud/metadata/core/filter/MetadataReactiveFilterTest.java

@@ -52,7 +52,7 @@ public class MetadataReactiveFilterTest {
 
     @Before
     public void setUp() {
-        this.metadataReactiveFilter = new MetadataReactiveFilter(this.metadataLocalProperties);
+        this.metadataReactiveFilter = new MetadataReactiveFilter();
     }
 
     @Test
@@ -64,12 +64,7 @@ public class MetadataReactiveFilterTest {
     @Test
     public void test2() {
         // Create mock WebFilterChain
-        WebFilterChain webFilterChain = new WebFilterChain() {
+        WebFilterChain webFilterChain = serverWebExchange -> Mono.empty();
-            @Override
-            public Mono<Void> filter(ServerWebExchange serverWebExchange) {
-                return Mono.empty();
-            }
-        };
 
         // Mock request
         MockServerHttpRequest request = MockServerHttpRequest

spring-cloud-tencent-starters/spring-cloud-tencent-metadata/src/test/java/com/tencent/cloud/metadata/core/filter/MetadataServletFilterTest.java

@@ -57,11 +57,8 @@ public class MetadataServletFilterTest {
     @Test
     public void test1() throws ServletException, IOException {
         // Create mock FilterChain
-        FilterChain filterChain = new FilterChain() {
+        FilterChain filterChain = (servletRequest, servletResponse) -> {
-            @Override
-            public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse) {
 
-            }
         };
 
         // Mock request

spring-cloud-tencent-starters/spring-cloud-tencent-polaris-gateway/pom.xml

@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>spring-cloud-tencent-starters</artifactId>
+        <groupId>com.tencent.cloud</groupId>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>spring-cloud-tencent-polaris-gateway</artifactId>
+    <name>Spring Cloud Tencent Polaris Gateway</name>
+
+    <dependencies>
+        <!-- Spring Cloud Tencent dependencies start -->
+        <dependency>
+            <groupId>com.tencent.cloud</groupId>
+            <artifactId>spring-cloud-tencent-commons</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.tencent.cloud</groupId>
+            <artifactId>spring-cloud-tencent-metadata</artifactId>
+        </dependency>
+        <!-- Spring Cloud Tencent dependencies end -->
+
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-gateway</artifactId>
+            <optional>true</optional>
+        </dependency>
+    </dependencies>
+
+</project>

spring-cloud-tencent-starters/spring-cloud-tencent-polaris-gateway/src/main/java/com/tencent/cloud/polaris/gateway/config/PolarisGatewayAutoConfiguration.java

@@ -0,0 +1,55 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed
+ * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+
+package com.tencent.cloud.polaris.gateway.config;
+
+import com.netflix.zuul.ZuulFilter;
+import com.netflix.zuul.http.ZuulServlet;
+import com.tencent.cloud.polaris.gateway.core.scg.filter.MetadataScgFilter;
+import com.tencent.cloud.polaris.gateway.core.zuul.filter.MetadataZuulFilter;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.cloud.gateway.filter.GlobalFilter;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Polaris Gateway Auto Configuration
+ *
+ * @author skyehtzhang
+ */
+@Configuration
+public class PolarisGatewayAutoConfiguration {
+
+    @Configuration(proxyBeanMethods = false)
+    @ConditionalOnClass(ZuulServlet.class)
+    static class PolarisGatewayZuulAutoConfiguration {
+        @Bean
+        public ZuulFilter metadataZuulFilter() {
+            return new MetadataZuulFilter();
+        }
+    }
+
+    @Configuration(proxyBeanMethods = false)
+    @ConditionalOnClass(GlobalFilter.class)
+    static class PolarisGatewayScgAutoConfiguration {
+        @Bean
+        public GlobalFilter metadataScgFilter() {
+            return new MetadataScgFilter();
+        }
+    }
+
+}

spring-cloud-tencent-starters/spring-cloud-tencent-polaris-gateway/src/main/java/com/tencent/cloud/polaris/gateway/core/scg/filter/AbstractGlobalFilter.java

@@ -0,0 +1,49 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed
+ * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+
+package com.tencent.cloud.polaris.gateway.core.scg.filter;
+
+import org.springframework.cloud.gateway.filter.GatewayFilterChain;
+import org.springframework.cloud.gateway.filter.GlobalFilter;
+import org.springframework.core.Ordered;
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+
+/**
+ * Abstract Global filter for ordering and checking if shouldFilter.
+ *
+ * @author Haotian Zhang
+ */
+public abstract class AbstractGlobalFilter  implements GlobalFilter, Ordered {
+
+    @Override
+    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
+        if (shouldFilter(exchange, chain)) {
+            return doFilter(exchange, chain);
+        } else {
+            return chain.filter(exchange);
+        }
+    }
+
+    @Override
+    abstract public int getOrder();
+
+    abstract public boolean shouldFilter(ServerWebExchange exchange, GatewayFilterChain chain);
+
+    abstract public Mono<Void> doFilter(ServerWebExchange exchange, GatewayFilterChain chain);
+}
+

spring-cloud-tencent-starters/spring-cloud-tencent-polaris-gateway/src/main/java/com/tencent/cloud/polaris/gateway/core/scg/filter/MetadataScgFilter.java

@@ -0,0 +1,77 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed
+ * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+
+package com.tencent.cloud.polaris.gateway.core.scg.filter;
+
+import com.tencent.cloud.metadata.constant.MetadataConstant;
+import com.tencent.cloud.metadata.context.MetadataContext;
+import com.tencent.cloud.metadata.context.MetadataContextHolder;
+import com.tencent.cloud.metadata.util.JacksonUtils;
+import org.springframework.cloud.gateway.filter.GatewayFilterChain;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.util.CollectionUtils;
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+
+import java.io.UnsupportedEncodingException;
+import java.net.URLEncoder;
+import java.util.Map;
+
+/**
+ * Scg filter used for writing metadata in HTTP request header.
+ *
+ * @author Haotian Zhang
+ */
+public class MetadataScgFilter extends AbstractGlobalFilter {
+
+    private static final int METADATA_SCG_FILTER_ORDER = 10151;
+
+    @Override
+    public int getOrder() {
+        return METADATA_SCG_FILTER_ORDER;
+    }
+
+    @Override
+    public boolean shouldFilter(ServerWebExchange exchange, GatewayFilterChain chain) {
+        return true;
+    }
+
+    @Override
+    public Mono<Void> doFilter(ServerWebExchange exchange, GatewayFilterChain chain) {
+        // get request builder
+        ServerHttpRequest.Builder builder = exchange.getRequest().mutate();
+
+        // get metadata of current thread
+        MetadataContext metadataContext = exchange.getAttribute(MetadataConstant.HeaderName.METADATA_CONTEXT);
+
+        // add new metadata and cover old
+        if (metadataContext == null) {
+            metadataContext = MetadataContextHolder.get();
+        }
+        Map<String, String> customMetadata = metadataContext.getAllTransitiveCustomMetadata();
+        if (!CollectionUtils.isEmpty(customMetadata)) {
+            String metadataStr = JacksonUtils.serializeToJson(customMetadata);
+            try {
+                builder.header(MetadataConstant.HeaderName.CUSTOM_METADATA, URLEncoder.encode(metadataStr, "UTF-8"));
+            } catch (UnsupportedEncodingException e) {
+                builder.header(MetadataConstant.HeaderName.CUSTOM_METADATA, metadataStr);
+            }
+        }
+
+        return chain.filter(exchange.mutate().request(builder.build()).build());
+    }
+}

spring-cloud-tencent-starters/spring-cloud-tencent-polaris-gateway/src/main/java/com/tencent/cloud/polaris/gateway/core/zuul/filter/MetadataZuulFilter.java

@@ -0,0 +1,79 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed
+ * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+
+package com.tencent.cloud.polaris.gateway.core.zuul.filter;
+
+import com.netflix.zuul.ZuulFilter;
+import com.netflix.zuul.context.RequestContext;
+import com.tencent.cloud.metadata.constant.MetadataConstant;
+import com.tencent.cloud.metadata.context.MetadataContext;
+import com.tencent.cloud.metadata.context.MetadataContextHolder;
+import com.tencent.cloud.metadata.util.JacksonUtils;
+import org.springframework.util.CollectionUtils;
+
+
+import java.io.UnsupportedEncodingException;
+import java.net.URLEncoder;
+import java.util.Map;
+
+import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.RIBBON_ROUTING_FILTER_ORDER;
+import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.ROUTE_TYPE;
+
+/**
+ * Zuul filter used for writing metadata in HTTP request header.
+ *
+ * @author skyehtzhang
+ */
+public class MetadataZuulFilter extends ZuulFilter {
+
+    @Override
+    public String filterType() {
+        return ROUTE_TYPE;
+    }
+
+    @Override
+    public int filterOrder() {
+        return RIBBON_ROUTING_FILTER_ORDER - 1;
+    }
+
+    @Override
+    public boolean shouldFilter() {
+        return true;
+    }
+
+    @Override
+    public Object run() {
+        // get request context
+        RequestContext requestContext = RequestContext.getCurrentContext();
+
+        // get metadata of current thread
+        MetadataContext metadataContext = MetadataContextHolder.get();
+
+        // add new metadata and cover old
+        Map<String, String> customMetadata = metadataContext.getAllTransitiveCustomMetadata();
+        if (!CollectionUtils.isEmpty(customMetadata)) {
+            String metadataStr = JacksonUtils.serializeToJson(customMetadata);
+            try {
+                requestContext.addZuulRequestHeader(MetadataConstant.HeaderName.CUSTOM_METADATA,
+                        URLEncoder.encode(metadataStr, "UTF-8"));
+            } catch (UnsupportedEncodingException e) {
+                requestContext.addZuulRequestHeader(MetadataConstant.HeaderName.CUSTOM_METADATA, metadataStr);
+            }
+        }
+        return null;
+    }
+}

spring-cloud-tencent-starters/spring-cloud-tencent-polaris-gateway/src/main/resources/META-INF/spring.factories

@@ -0,0 +1,2 @@
+org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
+  com.tencent.cloud.polaris.gateway.config.PolarisGatewayAutoConfiguration