Polish #615, add gateway example

spring-cloud-alibaba-examples/sentinel-example/sentinel-spring-cloud-gateway-example/src/main/java/org/springframework/cloud/alibaba/cloud/examples/MySCGConfiguration.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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 org.springframework.cloud.alibaba.cloud.examples;
+
+import com.alibaba.csp.sentinel.adapter.gateway.sc.callback.BlockRequestHandler;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.MediaType;
+import org.springframework.web.reactive.function.server.ServerResponse;
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+
+import static org.springframework.web.reactive.function.BodyInserters.fromObject;
+
+/**
+ * @author <a href="mailto:fangjian0423@gmail.com">Jim</a>
+ */
+@Configuration
+public class MySCGConfiguration {
+
+    @Bean
+    public BlockRequestHandler blockRequestHandler() {
+        return new BlockRequestHandler() {
+            @Override
+            public Mono<ServerResponse> handleRequest(ServerWebExchange exchange, Throwable t) {
+                return ServerResponse.status(444)
+                    .contentType(MediaType.APPLICATION_JSON_UTF8)
+                    .body(fromObject("SCS Sentinel block"));
+            }
+        };
+    }
+
+}

spring-cloud-alibaba-examples/sentinel-example/sentinel-spring-cloud-gateway-example/src/main/java/org/springframework/cloud/alibaba/cloud/examples/RulesWebFluxController.java

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+/*
+ * Copyright (C) 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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 org.springframework.cloud.alibaba.cloud.examples;
+
+import java.util.List;
+import java.util.Set;
+
+import com.alibaba.csp.sentinel.adapter.gateway.common.api.ApiDefinition;
+import com.alibaba.csp.sentinel.adapter.gateway.common.api.GatewayApiDefinitionManager;
+import com.alibaba.csp.sentinel.adapter.gateway.common.rule.GatewayFlowRule;
+import com.alibaba.csp.sentinel.adapter.gateway.common.rule.GatewayRuleManager;
+import com.alibaba.csp.sentinel.slots.block.flow.FlowRule;
+import com.alibaba.csp.sentinel.slots.block.flow.FlowRuleManager;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+import reactor.core.publisher.Mono;
+
+/**
+ * @author <a href="mailto:fangjian0423@gmail.com">Jim</a>
+ */
+@RestController
+public class RulesWebFluxController {
+
+    @GetMapping("/api")
+    public Mono<Set<ApiDefinition>> apiRules() {
+        return Mono.just(GatewayApiDefinitionManager.getApiDefinitions());
+    }
+
+    @GetMapping("/gateway")
+    public Mono<Set<GatewayFlowRule>> apiGateway() {
+        return Mono.just(GatewayRuleManager.getRules());
+    }
+
+    @GetMapping("/flow")
+    public Mono<List<FlowRule>> apiFlow() {
+        return Mono.just(FlowRuleManager.getRules());
+    }
+
+}

spring-cloud-alibaba-examples/sentinel-example/sentinel-spring-cloud-gateway-example/src/main/java/org/springframework/cloud/alibaba/cloud/examples/SentinelSpringCloudGatewayApplication.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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 org.springframework.cloud.alibaba.cloud.examples;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * @author <a href="mailto:fangjian0423@gmail.com">Jim</a>
+ */
+@SpringBootApplication
+public class SentinelSpringCloudGatewayApplication {
+
+    public static void main(String[] args) {
+        //GatewayCallbackManager.setRequestOriginParser(s -> "123");
+        SpringApplication.run(SentinelSpringCloudGatewayApplication.class, args);
+    }
+
+}

spring-cloud-alibaba-examples/sentinel-example/sentinel-spring-cloud-gateway-example/src/main/resources/api.json

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+[
+  {
+    "apiName": "some_customized_api",
+    "predicateItems": [
+      {
+        "pattern": "/product/baz"
+      },
+      {
+        "pattern": "/product/foo/**",
+        "matchStrategy": 1
+      },
+      {
+        "items": [
+          {
+            "pattern": "/spring-cloud/**"
+          },
+          {
+            "pattern": "/spring-cloud-alibaba/**"
+          }
+        ]
+      }
+    ]
+  },
+  {
+    "apiName": "another_customized_api",
+    "predicateItems": [
+      {
+        "pattern": "/ahas"
+      }
+    ]
+  }
+]

spring-cloud-alibaba-examples/sentinel-example/sentinel-spring-cloud-gateway-example/src/main/resources/application.yaml

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+server:
+  port: 18085
+spring:
+  application:
+    name: sentinel-spring-cloud-gateway
+  cloud:
+    gateway:
+      enabled: true
+      discovery:
+        locator:
+          lower-case-service-id: true
+      routes:
+      # Add your routes here.
+      - id: aliyun_route
+        uri: https://www.aliyun.com/
+        predicates:
+        - Path=/product/**
+      - id: httpbin_route
+        uri: https://httpbin.org
+        predicates:
+        - Path=/httpbin/**
+        filters:
+        - RewritePath=/httpbin/(?<segment>.*), /$\{segment}
+
+    sentinel:
+      datasource.ds2.file:
+        file: "classpath: gateway.json"
+        ruleType: gateway
+      datasource.ds1.file:
+        file: "classpath: api.json"
+        ruleType: api
+      transport:
+        dashboard: localhost:9999
+      filter:
+        enabled: true
+
+management.endpoints.web.exposure.include: "*"

spring-cloud-alibaba-examples/sentinel-example/sentinel-spring-cloud-gateway-example/src/main/resources/gateway.json

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+[
+  {
+    "resource": "some_customized_api",
+    "count": 1
+  },
+  {
+    "resource": "httpbin_route",
+    "count": 0,
+    "paramItem": {
+      "parseStrategy": 2,
+      "fieldName": "Spring-Cloud-Alibaba"
+    }
+  },
+  {
+    "resource": "httpbin_route",
+    "count": 0,
+    "paramItem": {
+      "parseStrategy": 3,
+      "fieldName": "name"
+    }
+  }
+]