如何使基于HTTP方法的Zuul动态路由和通过"serviceId"解析目标主机?

问题描述

如何基于 HTTP方法(GET/POST/PUT ...)使Zuul动态路由?例如，当您需要将 POST 请求路由到不同的主机而不是" zuul.routes.* "中描述的默认请求时. ...

How to make Zuul dynamic routing based on HTTP method (GET/POST/PUT...)?For example, when you need to route the POST request to the different host instead of the default one described in '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'第一服务'，但是如果我们请求' POST/first "，然后Zuul将请求路由到"第二项服务".

I.e. when we request 'GET /first' then Zuul route the request to the 'first-service', but if we request 'POST /first' then Zuul route the request to the 'second-service'.

推荐答案

要实现基于HTTP方法的动态路由，我们可以创建自定义的' 路由 "，键入ZuulFilter并通过DiscoveryClient解析"serviceId".例如:

To implement dynamic routing based on HTTP method we can create a custom 'route' type ZuulFilter and resolve 'serviceId' through DiscoveryClient. Fore example:

@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;
    }
}

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