Spring Cloud GatewaySpencer Gibb - @spencerbgibbRyan Baxter @ryanjbaxterStephane Maldini - @smaldini

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Spencer Gibb

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Spring Cloud Gateway

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Spring Cloud Gateway

Run on Spring Framework 5+

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Spring Cloud Gateway

Run on Spring Boot 2+&

Feature a cloud-native pattern

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Spring Cloud Gateway

That cloud-native pattern isAPI Gateway

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What is an API Gateway ?http://microservices.io/patterns/apigateway.html

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Routing

Security

Monitoring

Canary-ing

Monolith Strangling

Resiliency

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Gateway Types

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Appliance

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SAAS

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Web Server

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Mesh

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Developer Oriented

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Zuul 1

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Zuul 1Zuul 2

https://medium.com/netflix-techblog/zuul-2-the-netflix-journey-to-asynchronous-non-blocking-systems-45947377fb5c

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Spring Cloud Gateway

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Built on…

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Project Reactor

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Project Reactor

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Non-Blocking

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Inside the Gateway

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Inside the GatewayPredicates

PathHostDate/TimeMethodHeadersQuery ParamsCookiesRead Body….

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Inside the GatewayPre-Filters

HeadersPathRate LimitingCookiesHystrixModify Body…

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Inside the Gateway

Global Filters

Netty RouterWeb SocketsLoad BalancerMetrics…

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Inside the Gateway

Post Filters

Set statusHeadersCookies…

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spring:cloud:

gateway:- id: foo_route

uri: lb://foopredicates:- 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}

Route Configuration: YAML

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spring:cloud:

gateway:- id: foo_route

uri: lb://foopredicates:- 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}

Route Configuration: YAML

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Route Configuration: Java@Beanpublic 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();

}

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Custom Filterspublic class SetStatusWebFilterFactory implements GatewayFilterFactory {

@Overridepublic GatewayFilter apply(Config config) {

final HttpStatus status = parse(config.status);

return (exchange, chain) -> chain.filter(exchange).doOnComplete(() -> setResponseStatus(exchange, status));

}

}

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Demo

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Design Ideas

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Embedded

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Embedded

Sample Use Case

When latency is essential> no added network hops

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Embedded

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Embedded

Sample Use Case

Fine-grained access control for pay-per-use service or fragile backing service

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Facade

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Facade

Sample Use Cases

Prevent direct access to apps

Polyglot compatible

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Facade

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Facade

Sample Use Cases

Cross-cutting concerns

Present common API to clients

Shield clients from app refactoring (monolith → microservices)

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Cross-Cutting + App-Specific

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Cross-Cutting + App-Specific

Sample Use Case

Delegate cross-cutting concerns to a separate common gateway (and a separate dev team!)

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What Else Do We Have For Free ?

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Remember ?

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Spring Security

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Micrometer Support

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Micrometer Support

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Zipkin Support

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Demo

https://github.com/spring-cloud/spring-cloud-gateway

https://github.com/spring-cloud-samples/spring-cloud-gateway-sample

http://slides.com/spencer/spring-cloud-gateway

https://github.com/ryanjbaxter/gateway-s1p-2018

Spencer Gibb - @spencerbgibbRyan Baxter @ryanjbaxterStephane Maldini - @smaldini

Questions?