SpringOne Tour 2018 by Pivotal Spring Cloud Gateway - Craig Walls

1. Craig Walls
Twitter: @habuma
Spring Cloud
Gateway

2. Who is Craig?

3. API Gateway Pattern

4. The Mighty Monolith

5. The Monolithic API

6. Busting the Monolith

7. The Gateway

8. Gateway
Responsibilities
Routing
Canary Routing
Monolith Strangling
Security
Resiliency
Monitoring

9. What about Zuul?
Zuul 1
Based on blocking servlet API
Unable to do SSE or WebSocket
Limited to path-based routing
Proprietary features

10. Spring Cloud
Gateway

11. Spring Cloud Gateway
Based on Spring 5, Reactor, Boot 2
Routes can be configured in Java, configuration,
or with repositories
Can route on path, host, headers, parameters, or
anything in the request
Filters
Born in Colorado!

12. Spring Cloud Gateway

13. Spring Cloud Gateway

14. Spring Cloud Gateway

15. Spring Cloud Gateway

16. Spring Cloud Gateway

17. Simple Filter
@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");
}));
}
}

18. Route Config: YAML
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}

19. Route Config: Java
@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();
}

20. DEMO

21. Thank you!
Craig Walls
Twitter: @habuma