Zuul does not provide rateLimit function, If use SentinelRibbonFilter route filter. it wrapped by Hystrix Command. so only provide Service level circuit protect.

Sentinel can provide ServiceId level and API Path level flow control for zuul gateway service. This is simple project for alibaba/Sentinel spring cloud zuul integration sample.

Note: this project is for zuul 1.

eureka-server:

module used for discovery server. when service restart. it should be restart.

• EurekaServiceApplication: runs eureka service on port 8671. access by http:https://localhost:8761/

zuul-backend

backend service after gateway. consist of two application book and coke.

• CokeApplication: hosts a /coke ,/except service on port 9082
• BookApplication: hosts a /coke ,/except service with different implementation on port 9081

zuul-gateway

zuul gateway application.

• GatewayApplication runs zuul on port 8990.

run as spring boot application

curl -i localhost:8990/coke/coke

curl -i localhost:8990/coke/block

curl -i localhost:8990/coke/except

curl -i localhost:8990/book/coke

• SentinelRibbonFilter: extends RibbonRoutingFilter. override run method which add sentinel check. this project also enable Hystrix Circuit.
• SentinelOkHttpRoutingFilter: use okHttp3 as custom routing http client. and without Hystrix bind.

By default use SentinelOkHttpRoutingFilter as route filter:

 // disable filter can be set here.
 public static void main(String[] args) {
        new SpringApplicationBuilder(GatewayApplication.class)
                .properties("zuul.RibbonRoutingFilter.route.disable=true",
                        "zuul.SentinelRibbonFilter.route.disable=true")
                .run(args);
    }
    

Filters create structure like:

1. add vm config: -Dcsp.sentinel.api.port=18990

2. curl http:https://localhost:18990/tree?type=root

EntranceNode: machine-root(t:3 pq:0 bq:0 tq:0 rt:0 prq:0 1mp:0 1mb:0 1mt:0)
-EntranceNode: coke(t:2 pq:0 bq:0 tq:0 rt:0 prq:0 1mp:0 1mb:0 1mt:0)
--coke(t:2 pq:0 bq:0 tq:0 rt:0 prq:0 1mp:0 1mb:0 1mt:0)
---/coke/coke(t:0 pq:0 bq:0 tq:0 rt:0 prq:0 1mp:0 1mb:0 1mt:0)
-EntranceNode: sentinel_default_context(t:0 pq:0 bq:0 tq:0 rt:0 prq:0 1mp:0 1mb:0 1mt:0)
-EntranceNode: book(t:1 pq:0 bq:0 tq:0 rt:0 prq:0 1mp:0 1mb:0 1mt:0)
--book(t:1 pq:0 bq:0 tq:0 rt:0 prq:0 1mp:0 1mb:0 1mt:0)
---/book/coke(t:0 pq:0 bq:0 tq:0 rt:0 prq:0 1mp:0 1mb:0 1mt:0)

book and coke are serviceId.

---/book/coke is api path.

1. start Sentinel DashBord.

2. add vm property to zuul-gateway. -Dcsp.sentinel.dashboard.server=localhost:8088 -Dcsp.sentinel.api.port=18990.

3. Sentinel has full rule config features. see Dynamic-Rule-Configuration

Zuul provide FallbackProvider to cope with fall back logic.