微服务⽹关Spring Cloud Gateway

单块应⽤时代

单块+API时代

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⽹关职责

关于Zuul1

基于blocking servlet API

不⽀持SSE或者WebSocket

路由灵活度⼀般

Netflix专有功能

Spring Cloud Gateway

基于Spring, Reactor, Boot 2

⽀持基于配置或Java代码⽅式的灵活路由

路由⽀持path/host/header/parameters等

⽀持过滤器

https://cloud.spring.io/spring-cloud-gateway/spring-cloud-gateway.html

架构

简单过滤器

@Slf4j
public class SimpleFilter implements GatewayFilter {

@Override
public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
 log.info("BEFORE");
 return chain.filter(exchange)
 .then(Mono.fromRunnable(() -> {
 log.info("AFTER");
 }));
 }
}

YAML配置

spring:
 cloud:
  gateway:
   - id: foo_route
     uri: lb://foo
     predicates:
     - Host=**.foo.org
     - Path=/headers
     - Method=GET
     - Header=X-Request-Id, \d+
     - Query=foo, ba.
     - Query=baz
     - Cookie=chocolate, ch.p
     - After=1900-01-20T17:42:47.789-07:00[America/Denver]
     filters:
     - AddRequestHeader=X-Request-Foo, Bar
     - AddResponseHeader=X-Response-Foo, Bar
     - Hystrix=foo
     - SecureHeaders
     - RewritePath=/foo/(?<segment>.*), /$\{segment}

Java配置

@Bean
public RouteLocator customRouteLocator(RouteLocatorBuilder builder,
 ThrottleGatewayFilterFactory throttle) {
 return builder.routes()
 .route(r -> r.host("**.abc.org").and().path("/image/png")
 .filters(f -> f.addResponseHeader("X-TestHeader", "foobar"))
 .uri("http://httpbin.org:80")
 )
 .route(r -> r.path("/image/webp")
 .filters(f -> f.addResponseHeader("X-AnotherHeader", "baz"))
 .uri("http://httpbin.org:80")
 )
 .route(r -> r.order(-1)
 .host("**.throttle.org").and().path("/get")
 .filters(f -> f.filter(throttle.apply(1, 1, 10,
 TimeUnit.SECONDS)))
 .uri("http://httpbin.org:80")
 )
 .build();
}