Add OkHttp integration (#1456)

sentinel-adapter/pom.xml

@@ -27,6 +27,7 @@
         <module>sentinel-spring-cloud-gateway-adapter</module>
         <module>sentinel-spring-webmvc-adapter</module>
         <module>sentinel-zuul2-adapter</module>
+        <module>sentinel-okhttp-adapter</module>
         <module>sentinel-jax-rs-adapter</module>
     </modules>
 

sentinel-adapter/sentinel-okhttp-adapter/README.md

@@ -0,0 +1,63 @@
+# Sentinel OkHttp Adapter
+
+## Introduction
+
+Sentinel provides integration for OkHttp client to enable flow control for web requests.
+
+Add the following dependency in `pom.xml` (if you are using Maven):
+
+```xml
+<dependency>
+    <groupId>com.alibaba.csp</groupId>
+    <artifactId>sentinel-okhttp-adapter</artifactId>
+    <version>x.y.z</version>
+</dependency>
+```
+
+We can add the `SentinelOkHttpInterceptor` interceptor when `OkHttpClient` at initialization, for example:
+
+```java
+OkHttpClient client = new OkHttpClient.Builder()
+        .addInterceptor(new SentinelOkHttpInterceptor())
+        .build();
+```
+
+## Configuration
+
+- `SentinelOkHttpConfig` configuration:
+
+| name | description | type | default value |
+|------|------------|------|-------|
+| extractor | custom resource extractor | `OkHttpResourceExtractor` | `DefaultOkHttpResourceExtractor` |
+| fallback | handle request when it is blocked | `OkHttpFallback` | `DefaultOkHttpFallback` |
+
+### extractor (resource extractor)
+
+We can define `OkHttpResourceExtractor` to custom resource extractor replace `DefaultOkHttpResourceExtractor`, for example: okhttp:GET:ip:port/okhttp/back/1 ==> /okhttp/back/{id}
+
+```java
+OkHttpResourceExtractor extractor = (request, connection) -> {
+    String resource = request.url().toString();
+    String regex = "/okhttp/back/";
+    if (resource.contains(regex)) {
+        resource = resource.substring(0, resource.indexOf(regex) + regex.length()) + "{id}";
+    }
+    return resource;
+};
+SentinelOkHttpConfig.setExtractor(extractor);
+```
+
+### fallback (Block handling)
+
+We can define `OkHttpFallback` to handle request is blocked according to the actual scenario, for example:
+
+```java
+public class DefaultOkHttpFallback implements OkHttpFallback {
+
+    @Override
+    public Response handle(Request request, Connection connection, BlockException e) {
+        // Just wrap and throw the exception.
+        throw new SentinelRpcException(e);
+    }
+}
+```

sentinel-adapter/sentinel-okhttp-adapter/pom.xml

@@ -0,0 +1,68 @@
+<?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>sentinel-adapter</artifactId>
+        <groupId>com.alibaba.csp</groupId>
+        <version>1.8.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>sentinel-okhttp-adapter</artifactId>
+    <packaging>jar</packaging>
+
+    <properties>
+        <okhttp.version>3.6.0</okhttp.version>
+        <spring.boot.version>2.1.3.RELEASE</spring.boot.version>
+        <spring-test.version>5.1.5.RELEASE</spring-test.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.alibaba.csp</groupId>
+            <artifactId>sentinel-core</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.squareup.okhttp3</groupId>
+            <artifactId>okhttp</artifactId>
+            <version>${okhttp.version}</version>
+            <scope>provided</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.alibaba</groupId>
+            <artifactId>fastjson</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+            <version>${spring.boot.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-test</artifactId>
+            <version>${spring.boot.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+            <version>${spring-test.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+</project>

sentinel-adapter/sentinel-okhttp-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/okhttp/SentinelOkHttpInterceptor.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 1999-2020 Alibaba Group Holding Ltd.
+ *
+ * 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
+ *
+ *      http://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 com.alibaba.csp.sentinel.adapter.okhttp;
+
+import com.alibaba.csp.sentinel.*;
+import com.alibaba.csp.sentinel.adapter.okhttp.config.SentinelOkHttpConfig;
+import com.alibaba.csp.sentinel.slots.block.BlockException;
+import com.alibaba.csp.sentinel.util.StringUtil;
+import okhttp3.Interceptor;
+import okhttp3.Request;
+import okhttp3.Response;
+
+import java.io.IOException;
+
+/**
+ * @author zhaoyuguang
+ */
+public class SentinelOkHttpInterceptor implements Interceptor {
+
+    @Override
+    public Response intercept(Chain chain) throws IOException {
+        Entry entry = null;
+        try {
+            Request request = chain.request();
+            String name = SentinelOkHttpConfig.getExtractor().extract(request.url().toString(), request, chain.connection());
+            if (!StringUtil.isEmpty(SentinelOkHttpConfig.getPrefix())) {
+                name = SentinelOkHttpConfig.getPrefix() + name;
+            }
+            entry = SphU.entry(name, ResourceTypeConstants.COMMON_WEB, EntryType.OUT);
+            return chain.proceed(request);
+        } catch (BlockException e) {
+            return SentinelOkHttpConfig.getFallback().handle(chain.request(), chain.connection(), e);
+        } catch (Throwable t) {
+            Tracer.traceEntry(t, entry);
+            throw t;
+        } finally {
+            if (entry != null) {
+                entry.exit();
+            }
+        }
+    }
+}

sentinel-adapter/sentinel-okhttp-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/okhttp/config/SentinelOkHttpConfig.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright 1999-2020 Alibaba Group Holding Ltd.
+ *
+ * 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
+ *
+ *      http://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 com.alibaba.csp.sentinel.adapter.okhttp.config;
+
+import com.alibaba.csp.sentinel.adapter.okhttp.extractor.DefaultOkHttpResourceExtractor;
+import com.alibaba.csp.sentinel.adapter.okhttp.extractor.OkHttpResourceExtractor;
+import com.alibaba.csp.sentinel.adapter.okhttp.fallback.DefaultOkHttpFallback;
+import com.alibaba.csp.sentinel.adapter.okhttp.fallback.OkHttpFallback;
+import com.alibaba.csp.sentinel.util.AssertUtil;
+
+/**
+ * @author zhaoyuguang
+ */
+public final class SentinelOkHttpConfig {
+
+    private static volatile String prefix = "okhttp:";
+    private static volatile OkHttpResourceExtractor extractor = new DefaultOkHttpResourceExtractor();
+    private static volatile OkHttpFallback fallback = new DefaultOkHttpFallback();
+
+    public static String getPrefix() {
+        return prefix;
+    }
+
+    public static void setPrefix(String prefix) {
+        AssertUtil.notNull(prefix, "prefix cannot be null");
+        SentinelOkHttpConfig.prefix = prefix;
+    }
+
+    public static OkHttpResourceExtractor getExtractor() {
+        return extractor;
+    }
+
+    public static void setExtractor(OkHttpResourceExtractor extractor) {
+        AssertUtil.notNull(extractor, "extractor cannot be null");
+        SentinelOkHttpConfig.extractor = extractor;
+    }
+
+    public static OkHttpFallback getFallback() {
+        return fallback;
+    }
+
+    public static void setFallback(OkHttpFallback fallback) {
+        AssertUtil.notNull(fallback, "fallback cannot be null");
+        SentinelOkHttpConfig.fallback = fallback;
+    }
+}

sentinel-adapter/sentinel-okhttp-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/okhttp/extractor/DefaultOkHttpResourceExtractor.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 1999-2020 Alibaba Group Holding Ltd.
+ *
+ * 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
+ *
+ *      http://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 com.alibaba.csp.sentinel.adapter.okhttp.extractor;
+
+import okhttp3.Connection;
+import okhttp3.Request;
+
+/**
+ * @author zhaoyuguang
+ */
+public class DefaultOkHttpResourceExtractor implements OkHttpResourceExtractor {
+
+    @Override
+    public String extract(String url, Request request, Connection connection) {
+        return request.method() + ":" + request.url().toString();
+    }
+}

sentinel-adapter/sentinel-okhttp-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/okhttp/extractor/OkHttpResourceExtractor.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright 1999-2020 Alibaba Group Holding Ltd.
+ *
+ * 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
+ *
+ *      http://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 com.alibaba.csp.sentinel.adapter.okhttp.extractor;
+
+import okhttp3.Connection;
+import okhttp3.Request;
+
+/**
+ * @author zhaoyuguang
+ */
+public interface OkHttpResourceExtractor {
+
+    String extract(String url, Request request, Connection connection);
+}

sentinel-adapter/sentinel-okhttp-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/okhttp/fallback/DefaultOkHttpFallback.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright 1999-2020 Alibaba Group Holding Ltd.
+ *
+ * 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
+ *
+ *      http://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 com.alibaba.csp.sentinel.adapter.okhttp.fallback;
+
+import com.alibaba.csp.sentinel.slots.block.BlockException;
+import com.alibaba.csp.sentinel.slots.block.SentinelRpcException;
+import okhttp3.Connection;
+import okhttp3.Request;
+import okhttp3.Response;
+
+/**
+ * @author zhaoyuguang
+ */
+public class DefaultOkHttpFallback implements OkHttpFallback {
+
+    @Override
+    public Response handle(Request request, Connection connection, BlockException e) {
+        // Just wrap and throw the exception.
+        throw new SentinelRpcException(e);
+    }
+}

sentinel-adapter/sentinel-okhttp-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/okhttp/fallback/OkHttpFallback.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 1999-2020 Alibaba Group Holding Ltd.
+ *
+ * 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
+ *
+ *      http://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 com.alibaba.csp.sentinel.adapter.okhttp.fallback;
+
+import com.alibaba.csp.sentinel.slots.block.BlockException;
+import okhttp3.Connection;
+import okhttp3.Request;
+import okhttp3.Response;
+
+/**
+ * @author zhaoyuguang
+ */
+public interface OkHttpFallback {
+
+    Response handle(Request request, Connection connection, BlockException e);
+}