Zuul如何实现基于HTTP方式的动态路由，通过'serviceId'解析目标主机？

Question

如何基于HTTP方式做Zuul动态路由(GET/POST/PUT...)？例如，当您需要将 POST 请求路由到 不同的主机 而不是 '[=18 中描述的默认主机时=]zuul.routes.*'...

zuul:
  routes:
    first-service:
      path: /first/**
      serviceId: first-service
      stripPrefix: false

    second-service:
      path: /second/**
      serviceId: second-service
      stripPrefix: false

即当我们请求 'GET /first' 时，Zuul 将请求路由到 'first-service'，但是如果我们请求 'POST /first' 然后 Zuul 将请求路由到 'second-service'.

Answer 1

要实现基于 HTTP 方法的动态路由，我们可以创建自定义“route”类型 ZuulFilter 并通过 [ 解析 'serviceId' =12=]。例如：

@Component
public class PostFilter extends ZuulFilter {

    private static final String REQUEST_PATH = "/first";
    private static final String TARGET_SERVICE = "second-service";
    private static final String HTTP_METHOD = "POST";

    private final DiscoveryClient discoveryClient;

    public PostOrdersFilter(DiscoveryClient discoveryClient) {
        this.discoveryClient = discoveryClient;
    }

    @Override
    public String filterType() {
        return "route";
    }

    @Override
    public int filterOrder() {
        return 0;
    }

    @Override
    public boolean shouldFilter() {
        RequestContext context = RequestContext.getCurrentContext();
        HttpServletRequest request = context.getRequest();
        String method = request.getMethod();
        String requestURI = request.getRequestURI();
        return HTTP_METHOD.equalsIgnoreCase(method) && requestURI.startsWith(REQUEST_PATH);
    }

    @Override
    public Object run() {

        RequestContext context = RequestContext.getCurrentContext();
        List<ServiceInstance> instances = discoveryClient.getInstances(TARGET_SERVICE);
        try {
            if (instances != null && instances.size() > 0) {
                context.setRouteHost(instances.get(0).getUri().toURL());
            } else {
                throw new IllegalStateException("Target service instance not found!");
            }
        } catch (Exception e) {
            throw new IllegalArgumentException("Couldn't get service URL!", e);
        }
        return null;
    }
}

Answer 2

是对的。在这里，我只提出一种更简单的方法（没有服务发现）。假设你有那条路线：

zuul:
    routes:
        first:
            path: /first/**
            # No need for service id or url

然后你可以在'route'类型过滤器中路由'/first'路由的请求，只需将位置设置为请求上下文。

@Component
    public class RoutingFilter extends ZuulFilter {

    @Override
    public String filterType() {
        return ROUTE_TYPE;
    }

    @Override
    public int filterOrder() {
        return 0;
    }

    @Override
    public boolean shouldFilter() {
        return true;
    }

    @Override
    public Object run() throws ZuulException {
        /* Routing logic goes here */
        URL location = getRightLocationForRequest();
        ctx.setRouteHost(location);

        return null;
    }
}

Zuul如何实现基于HTTP方式的动态路由，通过'serviceId'解析目标主机？

How to make Zuul dynamic routing based on HTTP method and resolve target host by 'serviceId'?

spring

spring-cloud

netflix-zuul

spring-cloud-netflix