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# Spring Cloud Polaris Gray Release Example
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[English](./README.md) | 简体中文
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## 项目说明
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本项目演示如何使用 Spring Cloud Tencent 的路由和标签透传功能 完成 Spring Cloud 应用的全链路灰度。
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## 示例架构
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本示例请求都通过最上层网关进行分发，分发的目的地主要涉及3个环境：
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- 灰度环境1（只针对uid=1的请求放开），环境标识为env=green（绿色环境）
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- 灰度环境2（只针对uid=2的请求放开），环境标识为env=purple（紫色环境）
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- 基线环境（稳定的业务版本，针对其他请求放开），环境标识为env=blue（蓝色环境）
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## 如何接入
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### 启动网关服务
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1. 添加环境变量
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- 北极星服务端地址：polaris_address=grpc://127.0.0.1:8091
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- 可观测性PushGateway地址：prometheus_address=127.0.0.1:9091
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2. 启动router-grayrelease-gateway应用
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- IDE直接启动：找到主类 `GrayReleaseGatewayApplication`，执行 main 方法启动应用。
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- 打包编译后启动：首先执行 `mvn clean package` 将工程编译打包，然后执行 `java -jar router-grayrelease-gateway-${verion}.jar`启动应用。
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3. 添加路由规则
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通过往北极星接口发送以下数据，为网关服务添加路由规则，路由规则可以针对用户ID进行环境的分发。
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````
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POST /naming/v1/routings
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[{
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"service": "gray-release-gateway",
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"namespace": "default",
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"outbounds": [
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{
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"sources": [
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{
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"service": "gray-release-gateway",
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"namespace": "default",
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"metadata": {
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"${http.header.uid}": {
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"type": "EXACT",
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"value": "2"
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}
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}
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}],
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"destinations": [
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{
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"service": "*",
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"namespace": "*",
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"metadata": {
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"env": {
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"type": "EXACT",
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"value": "purple"
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}
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},
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"priority": 0,
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"weight": 100,
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"isolate": false
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}]
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},
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{
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"sources": [
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{
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"service": "gray-release-gateway",
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"namespace": "default",
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"metadata": {
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"${http.header.uid}": {
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"type": "EXACT",
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"value": "1"
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}
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}
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}],
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"destinations": [
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{
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"service": "*",
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"namespace": "*",
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"metadata": {
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"env": {
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"type": "EXACT",
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"value": "green"
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}
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},
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"priority": 0,
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"weight": 100,
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"isolate": false
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}]
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},
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{
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"sources": [
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{
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"service": "gray-release-gateway",
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"namespace": "default",
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"metadata": {
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"*": {
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"type": "EXACT",
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"value": "*"
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}
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}
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}],
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"destinations": [
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{
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"service": "*",
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"namespace": "*",
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"metadata": {
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"env": {
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"type": "EXACT",
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"value": "blue"
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}
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},
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"priority": 0,
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"weight": 100,
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"isolate": false
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}]
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}
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]
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}]
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````
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路由规则也可以通过北极星控制台进行定义，最终控制台效果如下：
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### 启动Front服务
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#### 启动基线环境（蓝色）
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1. 添加环境变量
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- 北极星服务端地址：polaris_address=grpc://127.0.0.1:8091
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- 可观测性PushGateway地址：prometheus_address=127.0.0.1:9091
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- 环境标识：SCT_METADATA_CONTENT_env=blue
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- 透传环境标识：SCT_METADATA_CONTENT_TRANSITIVE=env
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2. 启动router-grayrelease-frontend应用
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- IDE直接启动：找到主类 `GrayReleaseFrontApplication`，执行 main 方法启动应用。
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- 打包编译后启动：首先执行 `mvn clean package` 将工程编译打包，然后执行 `java -jar router-grayrelease-frontend-${verion}.jar`启动应用。
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#### 启动灰度环境1（绿色）
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1. 添加环境变量
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- 北极星服务端地址：polaris_address=grpc://127.0.0.1:8091
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- 可观测性PushGateway地址：prometheus_address=127.0.0.1:9091
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- 环境标识：SCT_METADATA_CONTENT_env=green
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- 透传环境标识：SCT_METADATA_CONTENT_TRANSITIVE=env
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2. 启动router-grayrelease-frontend应用（与前面一致）
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如果遇到端口冲突，可以通过-Dserver.port来指定端口
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#### 启动灰度环境2（紫色）
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1. 添加环境变量
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- 北极星服务端地址：polaris_address=grpc://127.0.0.1:8091
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- 可观测性PushGateway地址：prometheus_address=127.0.0.1:9091
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- 环境标识：SCT_METADATA_CONTENT_env=purple
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- 透传环境标识：SCT_METADATA_CONTENT_TRANSITIVE=env
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2. 启动router-grayrelease-frontend应用（与前面一致）
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#### 启动后效果
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在北极星控制台，可以看到gray-release-front服务下有3个节点，每个节点有不同的环境标识。
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### 启动middle服务
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#### 启动基线环境（蓝色）
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1. 添加环境变量
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- 北极星服务端地址：polaris_address=grpc://127.0.0.1:8091
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- 可观测性PushGateway地址：prometheus_address=127.0.0.1:9091
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- 环境标识：SCT_METADATA_CONTENT_env=blue
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- 透传环境标识：SCT_METADATA_CONTENT_TRANSITIVE=env
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2. 启动router-grayrelease-middle应用
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- IDE直接启动：找到主类 `GrayReleaseMiddleApplication`，执行 main 方法启动应用。
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- 打包编译后启动：首先执行 `mvn clean package` 将工程编译打包，然后执行 `java -jar router-grayrelease-middle-${verion}.jar`启动应用。
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#### 启动灰度环境2（紫色）
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1. 添加环境变量
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- 北极星服务端地址：polaris_address=grpc://127.0.0.1:8091
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- 可观测性PushGateway地址：prometheus_address=127.0.0.1:9091
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- 环境标识：SCT_METADATA_CONTENT_env=purple
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- 透传环境标识：SCT_METADATA_CONTENT_TRANSITIVE=env
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2. 启动router-grayrelease-middle应用（与前面一致）
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### 启动back服务
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#### 启动基线环境（蓝色）
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1. 添加环境变量
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- 北极星服务端地址：polaris_address=grpc://127.0.0.1:8091
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- 可观测性PushGateway地址：prometheus_address=127.0.0.1:9091
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- 环境标识：SCT_METADATA_CONTENT_env=blue
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- 透传环境标识：SCT_METADATA_CONTENT_TRANSITIVE=env
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2. 启动router-grayrelease-backend应用
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- IDE直接启动：找到主类 `GrayReleaseBackendApplication`，执行 main 方法启动应用。
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- 打包编译后启动：首先执行 `mvn clean package` 将工程编译打包，然后执行 `java -jar router-grayrelease-backend-${verion}.jar`启动应用。
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#### 启动灰度环境1（绿色）
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1. 添加环境变量
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- 北极星服务端地址：polaris_address=grpc://127.0.0.1:8091
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- 可观测性PushGateway地址：prometheus_address=127.0.0.1:9091
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- 环境标识：SCT_METADATA_CONTENT_env=green
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- 透传环境标识：SCT_METADATA_CONTENT_TRANSITIVE=env
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2. 启动router-grayrelease-backend应用（与前面一致）
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### 测试
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#### 基线环境路由
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````
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curl -H'uid:0' 127.0.0.1:59100/router/gray/route_rule
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````
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获取结果
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````
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gray-release-gateway -> gray-release-front[blue] -> gray-release-middle[blue] -> gray-release-back[blue]
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````
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#### 灰度环境1（绿色）路由
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````
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curl -H'uid:1' 127.0.0.1:59100/router/gray/route_rule
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````
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获取结果
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````
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gray-release-gateway -> gray-release-front[green] -> gray-release-middle[blue] -> gray-release-back[green]
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````
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#### 灰度环境2（紫色）路由
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````
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curl -H'uid:2' 127.0.0.1:59100/router/gray/route_rule
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````
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获取结果
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````
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gray-release-gateway -> gray-release-front[purple] -> gray-release-middle[purple] -> gray-release-back[blue]
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````
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