SpringCloud初体验：五、Sidecar 将 PHP 这类非 Java 生态语言的服务接入 Spring Cloud

先起一个 Sidecar 服务，一个PHP服务一个应用，和PHP服务部署在同一台机子，通过 localhost 访问，这样就解决了网络开销，相当于本地进程间调用

Sidecar 服务比较简单，

1、这里记录下 maven 的配置

<?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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.taxiong</groupId>
    <artifactId>tx_php_server_side_car</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>tx_php_server_side_car</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <!--配置仓库-->
    <repositories>
        <repository>
            <id>aliRepository</id>
            <name>aliRepository</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

    <!-- cloud -->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-netflix-sidecar</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

2、sidecar 相关的配置，及注册中心的配置

spring:
  application:
    name: tx-php-server-sidecar

#服务注册中心端口号
server:
  port: 8203

#服务注册中心实例的主机名、端口
#是否向服务注册中心注册自己
#是否检索服务
#服务注册中心的配置内容，指定服务注册中心的位置
eureka:
  port: 8200
  instance:
    hostname: localhost
  client:
    register-with-eureka: true
    fetch-registry: true
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${eureka.port}/eureka/

sidecar:
  port: 1215
  instance:
    hostname: localhost
  health-uri: http://${sidecar.instance.hostname}:${sidecar.port}/health

3、服务启动类 @EnableSidecar

4、还需要在PHP服务一个检查服务的接口或文件， 注意响应头类型 Content-Type

以 laravel 框架为例子，配置后的地址是 http://127.0.0.1:1215/health

Route::get('health', function () {
    $content = '{ "status" : "UP" }';
    $status = 200;
    $value = 'application/json; charset=utf-8';
    return response($content, $status)
        ->header('Content-Type', $value);
});

这是通过 Eureka 中心页面，看见 Sidecar 已经注册上去，注意如果 PHP 的 health 页面的响应内容或者响应头不对的话， Sidecar 服务的 UP 状态会显示 DOWN

这里是 PHP 服务的默认页面

这里是通过 Spring Cloud gateway 转发后的 PHP 服务页面

服务间调用

一、PHP 服务调用 Java 服务的用法（调用host地址是Sidecar的地址，URi为服务名加接口地址，URi的拼装和Feign一样）

<?php
/**
 * Created by PhpStorm.
 * User: liugx
 * Date: 2018/9/9
 * Time: 下午12:57
 */

namespace App\Http\Controllers;

use App\Exceptions\BusinessException;
use GuzzleHttp\Client;

class TestController extends Controller
{
    /**
     * @return \Psr\Http\Message\StreamInterface
     * @throws BusinessException
     */
    public function test()
    {
        // Sidecar的端口号（本地调用）
        $host = 'http://localhost:8203';
        // 注册到Eureka的服务名称
        $javaServiceName = 'tx-java-server';
        // 要调用服务的接口URL
        $func = '/';
        // 通过Sidecar调用服务的URL
        $uri = "/{$javaServiceName}{$func}";

        $base_uri = $host;
        $client = new Client([
            // Base URI is used with relative requests
            'base_uri' => $base_uri,
            'timeout' => 3.0,
        ]);
        $params = [];
        try {
            $response = $client->request('GET', $uri, [
                'query' => $params
            ]);
        } catch (\GuzzleHttp\Exception\GuzzleException  $ex) {

            throw new BusinessException("抱歉，网络异常:{$ex->getMessage()}");
        }

        return $response->getBody();
    }
}

二、Java 服务调用 PHP 服务的用法

直接用FeignClient做服务间调用

SpringCloud初体验：三、Feign 服务间调用(FeignClient)、负载均衡(Ribbon)、容错/降级处理(Hystrix)