├── .gitignore ├── LICENSE ├── README.md ├── img ├── nacos-console-push-empty-rules.png ├── nacos-console-push-new-rule.png ├── sd-add-rule-initial.png ├── sd-monitoring-after-initial.png ├── sd-monitoring-changed.png ├── sd-monitoring-no-block.png ├── sd-resource-chain.png ├── sd-rule-list-changed.png ├── sd-rules-after-initial.png ├── sentinel-dashboard-machine-list.png └── sentinel-dashboard-overview.png ├── pom.xml └── src └── main ├── java └── com │ └── alibaba │ └── csp │ └── demo │ └── sc │ ├── DemoApplication.java │ ├── config │ └── SentinelConfig.java │ └── controller │ └── DemoController.java └── resources └── application.properties /.gitignore: -------------------------------------------------------------------------------- 1 | # Created by .ignore support plugin (hsz.mobi) 2 | ### Maven template 3 | target/ 4 | pom.xml.tag 5 | pom.xml.releaseBackup 6 | pom.xml.versionsBackup 7 | pom.xml.next 8 | release.properties 9 | dependency-reduced-pom.xml 10 | buildNumber.properties 11 | .mvn/timing.properties 12 | .mvn/wrapper/maven-wrapper.jar 13 | ### macOS template 14 | # General 15 | .DS_Store 16 | .AppleDouble 17 | .LSOverride 18 | 19 | # Icon must end with two \r 20 | Icon 21 | 22 | # Thumbnails 23 | ._* 24 | 25 | # Files that might appear in the root of a volume 26 | .DocumentRevisions-V100 27 | .fseventsd 28 | .Spotlight-V100 29 | .TemporaryItems 30 | .Trashes 31 | .VolumeIcon.icns 32 | .com.apple.timemachine.donotpresent 33 | 34 | # Directories potentially created on remote AFP share 35 | .AppleDB 36 | .AppleDesktop 37 | Network Trash Folder 38 | Temporary Items 39 | .apdisk 40 | 41 | # IntelliJ project files 42 | .idea 43 | *.iml 44 | out 45 | gen 46 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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For example, we're going to register a Nacos datasource. It just needs 3 steps: 44 | 45 | - (1) Add `sentinel-datasource-nacos` dependency: 46 | 47 | ```xml 48 | 49 | com.alibaba.csp 50 | sentinel-datasource-nacos 51 | 1.3.0-GA 52 | 53 | ``` 54 | 55 | - (2) Add the datasource config to `application.properties` so that the Nacos datasource can be automatically created and registered to Sentinel. 56 | 57 | ``` 58 | # Sentinel datasource 59 | spring.cloud.sentinel.datasource.type=nacos 60 | spring.cloud.sentinel.datasource.serverAddr=localhost:8848 61 | spring.cloud.sentinel.datasource.groupId=DEFAULT_GROUP 62 | spring.cloud.sentinel.datasource.dataId=sentinel-demo-flow-rules 63 | spring.cloud.sentinel.datasource.converter=flowConverter 64 | ``` 65 | 66 | - (3) Create a config class to bind properties and provide converter: 67 | 68 | ```java 69 | @Configuration 70 | public class SentinelConfig { 71 | 72 | @SentinelDataSource("spring.cloud.sentinel.datasource") 73 | private ReadableDataSource dataSource; 74 | 75 | @Bean 76 | public Converter> flowConverter() { 77 | return source -> JSON.parseObject(source, new TypeReference>() {}); 78 | } 79 | } 80 | ``` 81 | 82 | Now it's ready. We can run the demo to see the effects of flow control in Sentinel. 83 | 84 | ## Run the demo 85 | 86 | First we need to start the Nacos server (see [instruction](https://nacos.io/en-us/docs/quick-start.html)). And push empty flow rule list in Nacos console: 87 | 88 | ![nacos-console-push-empty-rules](./img/nacos-console-push-empty-rules.png) 89 | 90 | Now let's run the demo in IDE. After the demo has been started, we can see our application (`sentinel-spring-cloud-demo`) in Sentinel Dashboard. All machines of the application are listed in **Machine List** page: 91 | 92 | ![sentinel-dashboard-machine-list](./img/sentinel-dashboard-machine-list.png) 93 | 94 | Then we write a script or using tools (e.g. `ab`) to initiate batch requests to our demo server. An example script: 95 | 96 | ```bash 97 | while true 98 | do 99 | curl -s "http://localhost:18181/hello" 100 | echo "" 101 | done 102 | ``` 103 | 104 | Now we execute the script or command to initiate requests. We can see the real-time traffic monitoring in **Monitoring** page: 105 | 106 | ![sd-monitoring-no-block](./img/sd-monitoring-no-block.png) 107 | 108 | All of the invocation resources are showed in **Resource Chain** page: 109 | 110 | ![sd-resource-chain](./img/sd-resource-chain.png) 111 | 112 | Assuming that our API can only afford 5 QPS, but incoming surge requests are more than the threshold. If we don't take some actions, our service might suffer from high load and fail. So we need to configure flow rules to limit requests to guarantee reliability of our service. 113 | 114 | ### Configure rules in Sentinel Dashboard 115 | 116 | We can manage rules in Sentinel Dashboard directly. Now let's add a flow rule from **Resource Chain** page. Just click "Add Flow" button in the line of target API resource. 117 | 118 | Sentinel supports [flow control](https://github.com/alibaba/Sentinel/wiki/Flow-Control) in multiple dimensions (resource granularity, metric type, invocation relationship and traffic shaping effect). In *Add New Flow Rule* dialog, we can choose and configure all of these. Here we simply add a rule limiting the max QPS of our API to 5: 119 | 120 | ![sd-add-rule-initial](./img/sd-add-rule-initial.png) 121 | 122 | Click "Add" button, then we can see the rule in **Flow Rules** page: 123 | 124 | ![sd-rules-after-initial](./img/sd-rules-after-initial.png) 125 | 126 | The flow rule will take effect immediately. Wait a short time and back to the **Monitoring** page. Now we can see the passed QPS curve has been decrased to 5 visually. Exceeded requests are blocked (the blue curve). 127 | 128 | ![sd-monitoring-after-initial](./img/sd-monitoring-after-initial.png) 129 | 130 | For more details of Sentinel Dashboard, please refer to [dashboard document](https://github.com/alibaba/Sentinel/wiki/Dashboard). 131 | 132 | > Note: Rules pushed from Sentinel dashboard are stored in memory. If dynamic rule datasource is registered, 133 | the old rules will be replaced by rule changes from datasource. 134 | 135 | ### Configure rules in Nacos console 136 | 137 | If our application consists of plenty of machines (or containers), it's not a good idea to push rules to each machine one by one. 138 | 139 | In production it's common to use config center to store the rules. So usually we can leverage [dynamic rule datasource of Sentinel](https://github.com/alibaba/Sentinel/wiki/Dynamic-Rule-Configuration) in production. Sentinel provides extensions for various config center, e.g. Nacos, ZooKeeper and Redis. 140 | 141 | Now let's configure the rules in Nacos console. After pushing the rules to Nacos, all instances will receive the updated rules. 142 | 143 | We choose the entry of groupId `DEFAULT_GROUP` and dataId `sentinel-demo-flow-rules` and click "Edit". In the *Edit Configuration* page, we change the rule content to the following list: 144 | 145 | ```json 146 | [ 147 | { 148 | "resource": "/hello", 149 | "count": 8.0 150 | } 151 | ] 152 | ``` 153 | 154 | This rule represents flow control for resource `/hello` (our web API), limit max QPS at 8. 155 | 156 | ![nacos-console-push-new-rule](./img/nacos-console-push-new-rule.png) 157 | 158 | Click "Publish" button to publish the configuration. We can notice that old rules have been replaced by new rules in Sentinel rule page: 159 | 160 | ![sd-rule-list-changed](./img/sd-rule-list-changed.png) 161 | 162 | Now let'g go back to the **Monitoring** page. 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-------------------------------------------------------------------------------- /pom.xml: -------------------------------------------------------------------------------- 1 | 2 | 5 | 4.0.0 6 | 7 | com.alibaba.csp 8 | sentinel-spring-cloud-demo 9 | 1.3.0 10 | 11 | A simple demo for using Sentinel with Spring Cloud Alibaba 12 | 13 | 14 | org.springframework.boot 15 | spring-boot-starter-parent 16 | 2.0.6.RELEASE 17 | 18 | 19 | 20 | 21 | UTF-8 22 | UTF-8 23 | 1.8 24 | Finchley.SR2 25 | 1.3.0-GA 26 | 27 | 28 | 29 | 30 | org.springframework.boot 31 | spring-boot-starter-web 32 | 33 | 34 | org.springframework.cloud 35 | spring-cloud-starter 36 | 37 | 38 | org.springframework.boot 39 | spring-boot-starter-actuator 40 | 41 | 42 | org.springframework.cloud 43 | spring-cloud-starter-alibaba-sentinel 44 | 45 | 46 | 47 | com.alibaba.csp 48 | sentinel-datasource-nacos 49 | ${sentinel.version} 50 | 51 | 52 | 53 | org.springframework.boot 54 | spring-boot-starter-test 55 | test 56 | 57 | 58 | 59 | 60 | 61 | 62 | org.springframework.cloud 63 | spring-cloud-dependencies 64 | ${spring-cloud.version} 65 | pom 66 | import 67 | 68 | 69 | org.springframework.cloud 70 | spring-cloud-alibaba-dependencies 71 | 0.2.0.RELEASE 72 | pom 73 | import 74 | 75 | 76 | 77 | 78 | 79 | 80 | 81 | org.springframework.boot 82 | spring-boot-maven-plugin 83 | 84 | 85 | 86 | 87 | -------------------------------------------------------------------------------- /src/main/java/com/alibaba/csp/demo/sc/DemoApplication.java: -------------------------------------------------------------------------------- 1 | package com.alibaba.csp.demo.sc; 2 | 3 | import org.springframework.boot.SpringApplication; 4 | import org.springframework.boot.autoconfigure.SpringBootApplication; 5 | 6 | /** 7 | * @author Eric Zhao 8 | */ 9 | @SpringBootApplication 10 | public class DemoApplication { 11 | 12 | public static void main(String[] args) { 13 | SpringApplication.run(DemoApplication.class, args); 14 | } 15 | } 16 | -------------------------------------------------------------------------------- /src/main/java/com/alibaba/csp/demo/sc/config/SentinelConfig.java: -------------------------------------------------------------------------------- 1 | package com.alibaba.csp.demo.sc.config; 2 | 3 | import java.util.List; 4 | 5 | import com.alibaba.csp.sentinel.datasource.Converter; 6 | import com.alibaba.csp.sentinel.datasource.ReadableDataSource; 7 | import com.alibaba.csp.sentinel.slots.block.flow.FlowRule; 8 | import com.alibaba.fastjson.JSON; 9 | import com.alibaba.fastjson.TypeReference; 10 | 11 | import org.springframework.cloud.alibaba.sentinel.datasource.annotation.SentinelDataSource; 12 | import org.springframework.context.annotation.Bean; 13 | import org.springframework.context.annotation.Configuration; 14 | 15 | /** 16 | * @author Eric Zhao 17 | */ 18 | @Configuration 19 | public class SentinelConfig { 20 | 21 | @SentinelDataSource("spring.cloud.sentinel.datasource") 22 | private ReadableDataSource dataSource; 23 | 24 | @Bean 25 | public Converter> flowConverter() { 26 | return source -> JSON.parseObject(source, new TypeReference>() {}); 27 | } 28 | } 29 | -------------------------------------------------------------------------------- /src/main/java/com/alibaba/csp/demo/sc/controller/DemoController.java: -------------------------------------------------------------------------------- 1 | package com.alibaba.csp.demo.sc.controller; 2 | 3 | import org.springframework.web.bind.annotation.GetMapping; 4 | import org.springframework.web.bind.annotation.RestController; 5 | 6 | /** 7 | * @author Eric Zhao 8 | */ 9 | @RestController 10 | public class DemoController { 11 | 12 | @GetMapping("/hello") 13 | public String apiHello() { 14 | return "Hello at " + System.currentTimeMillis(); 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /src/main/resources/application.properties: -------------------------------------------------------------------------------- 1 | spring.application.name=sentinel-spring-cloud-demo 2 | server.port=18181 3 | 4 | # Sentinel related 5 | spring.cloud.sentinel.transport.dashboard=localhost:8080 6 | spring.cloud.sentinel.eager=true 7 | 8 | # Sentinel datasource 9 | spring.cloud.sentinel.datasource.type=nacos 10 | spring.cloud.sentinel.datasource.serverAddr=localhost:8848 11 | spring.cloud.sentinel.datasource.groupId=DEFAULT_GROUP 12 | spring.cloud.sentinel.datasource.dataId=sentinel-demo-flow-rules 13 | spring.cloud.sentinel.datasource.converter=flowConverter --------------------------------------------------------------------------------