序

ribbon的超时设置，只能按转发的serviceId来分的，无法像nginx那样直接在每个转发的链接里头设置超时时间。这里hack一下，实现url基本的ribbon超时时间设置。具体的思路就是重写RibbonApacheHttpRequest的toRequest方法，然后进行设置。

CustomRibbonApacheHttpRequest

public class CustomRibbonApacheHttpRequest extends RibbonApacheHttpRequest {
    public CustomRibbonApacheHttpRequest(RibbonCommandContext context) {
        super(context);
    }

    @Override
    public HttpUriRequest toRequest(RequestConfig requestConfig) {
        final RequestBuilder builder = RequestBuilder.create(this.context.getMethod());
        builder.setUri(this.uri);
        for (final String name : this.context.getHeaders().keySet()) {
            final List<String> values = this.context.getHeaders().get(name);
            for (final String value : values) {
                builder.addHeader(name, value);
            }
        }

        for (final String name : this.context.getParams().keySet()) {
            final List<String> values = this.context.getParams().get(name);
            for (final String value : values) {
                builder.addParameter(name, value);
            }
        }

        if (this.context.getRequestEntity() != null) {
            final BasicHttpEntity entity;
            entity = new BasicHttpEntity();
            entity.setContent(this.context.getRequestEntity());
            // if the entity contentLength isn't set, transfer-encoding will be set
            // to chunked in org.apache.http.protocol.RequestContent. See gh-1042
            if (this.context.getContentLength() != null) {
                entity.setContentLength(this.context.getContentLength());
            } else if ("GET".equals(this.context.getMethod())) {
                entity.setContentLength(0);
            }
            builder.setEntity(entity);
        }

        customize(this.context.getRequestCustomizers(), builder);

        //todo 这里处理个性的timeout信息
        if(uri.getPath().equals("/review/timeout")){
            RequestConfig.Builder configBuilder = RequestConfig.copy(builder.getConfig());
            configBuilder.setConnectionRequestTimeout(30*1000);
            configBuilder.setConnectTimeout(30*1000);
            configBuilder.setSocketTimeout(30*1000);
            builder.setConfig(configBuilder.build());
        }else{
            builder.setConfig(requestConfig);
        }

        return builder.build();
    }
}

CustomHttpClientRibbonCommand

public class CustomHttpClientRibbonCommand extends HttpClientRibbonCommand {

    public CustomHttpClientRibbonCommand(String commandKey, RibbonLoadBalancingHttpClient client, RibbonCommandContext context, ZuulProperties zuulProperties) {
        super(commandKey, client, context, zuulProperties);
    }

    public CustomHttpClientRibbonCommand(String commandKey, RibbonLoadBalancingHttpClient client, RibbonCommandContext context, ZuulProperties zuulProperties, ZuulFallbackProvider zuulFallbackProvider) {
        super(commandKey, client, context, zuulProperties, zuulFallbackProvider);
    }

    @Override
    protected RibbonApacheHttpRequest createRequest() throws Exception {
        RibbonApacheHttpRequest ribbonApacheHttpRequest = new CustomRibbonApacheHttpRequest(this.context);
        return ribbonApacheHttpRequest;
    }
}

CustomHttpClientRibbonCommandFactory

public class CustomHttpClientRibbonCommandFactory extends HttpClientRibbonCommandFactory{

    private final SpringClientFactory clientFactory;

    private final ZuulProperties zuulProperties;

    public CustomHttpClientRibbonCommandFactory(SpringClientFactory clientFactory, ZuulProperties zuulProperties) {
        super(clientFactory, zuulProperties);
        this.clientFactory = clientFactory;
        this.zuulProperties = zuulProperties;
    }

    public CustomHttpClientRibbonCommandFactory(SpringClientFactory clientFactory, ZuulProperties zuulProperties, Set<ZuulFallbackProvider> fallbackProviders) {
        super(clientFactory, zuulProperties, fallbackProviders);
        this.clientFactory = clientFactory;
        this.zuulProperties = zuulProperties;
    }

    @Override
    public HttpClientRibbonCommand create(RibbonCommandContext context) {
        ZuulFallbackProvider zuulFallbackProvider = getFallbackProvider(context.getServiceId());
        final String serviceId = context.getServiceId();
        final RibbonLoadBalancingHttpClient client = this.clientFactory.getClient(
                serviceId, RibbonLoadBalancingHttpClient.class);
        client.setLoadBalancer(this.clientFactory.getLoadBalancer(serviceId));

        return new CustomHttpClientRibbonCommand(serviceId, client, context, zuulProperties, zuulFallbackProvider);
    }
}

配置

@Autowired(required = false)
    private Set<ZuulFallbackProvider> zuulFallbackProviders = Collections.emptySet();

    @Bean
    @ConditionalOnMissingBean
    public RibbonCommandFactory<?> ribbonCommandFactory(
            SpringClientFactory clientFactory, ZuulProperties zuulProperties) {
        return new CustomHttpClientRibbonCommandFactory(clientFactory, zuulProperties, zuulFallbackProviders);
    }

网关的超时层级

zuul

zuul:
  max:
    host:
      connections: 500
  host:
    socket-timeout-millis: 60000
    connect-timeout-millis: 60000

ribbon

ribbon:
  ReadTimeout: 10000
  ConnectTimeout: 10000
  MaxAutoRetries: 0
  MaxAutoRetriesNextServer: 1
  eureka:
    enabled: true

hystrix

hystrix:
  command:
    default:
      execution:
        timeout:
          enabled: true
        isolation:
          thread:
            timeoutInMilliseconds: 60000

小结

走网关的话，有三层的超时时间，一个是zuul的，一个是ribbon的，还有一个是hystrix的。hystrix的超时设置，AbstractRibbonCommand这个类没有暴露设置hystrix的Setter方法出来，所以无法通过继承的方式来扩展。因此要自定义ribbon超时的话，需要这个超时时间是小于hystrix的，不然就提前被hystrix超时了，无法起到效果。