/*
* Copyright 2013-2017 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.cloud.netflix.ribbon.okhttp;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import java.net.URI;
import org.apache.commons.lang.BooleanUtils;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalancedRetryContext;
import org.springframework.cloud.client.loadbalancer.LoadBalancedRetryPolicy;
import org.springframework.cloud.client.loadbalancer.LoadBalancedRetryPolicyFactory;
import org.springframework.cloud.client.loadbalancer.ServiceInstanceChooser;
import org.springframework.cloud.netflix.feign.ribbon.FeignRetryPolicy;
import org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient;
import org.springframework.cloud.netflix.ribbon.ServerIntrospector;
import org.springframework.cloud.netflix.ribbon.support.RetryableStatusCodeException;
import org.springframework.http.HttpRequest;
import org.springframework.retry.RetryCallback;
import org.springframework.retry.RetryContext;
import org.springframework.retry.policy.NeverRetryPolicy;
import org.springframework.retry.support.RetryTemplate;
import org.springframework.web.util.UriComponentsBuilder;
import com.netflix.client.RequestSpecificRetryHandler;
import com.netflix.client.RetryHandler;
import com.netflix.client.config.IClientConfig;
import com.netflix.loadbalancer.Server;
/**
* An OK HTTP client which leverages Spring Retry to retry failed request.
* @author Ryan Baxter
*/
public class RetryableOkHttpLoadBalancingClient extends OkHttpLoadBalancingClient implements ServiceInstanceChooser {
private LoadBalancedRetryPolicyFactory loadBalancedRetryPolicyFactory;
public RetryableOkHttpLoadBalancingClient(IClientConfig config, ServerIntrospector serverIntrospector,
LoadBalancedRetryPolicyFactory loadBalancedRetryPolicyFactory) {
super(config, serverIntrospector);
this.loadBalancedRetryPolicyFactory = loadBalancedRetryPolicyFactory;
}
private OkHttpRibbonResponse executeWithRetry(OkHttpRibbonRequest request, LoadBalancedRetryPolicy retryPolicy,
RetryCallback<OkHttpRibbonResponse, Exception> callback)
throws Exception {
RetryTemplate retryTemplate = new RetryTemplate();
boolean retryable = request.getContext() == null ? true :
BooleanUtils.toBooleanDefaultIfNull(request.getContext().getRetryable(), true);
retryTemplate.setRetryPolicy(retryPolicy == null || !retryable ? new NeverRetryPolicy()
: new RetryPolicy(request, retryPolicy, this, this.getClientName()));
return retryTemplate.execute(callback);
}
@Override
public OkHttpRibbonResponse execute(final OkHttpRibbonRequest ribbonRequest,
final IClientConfig configOverride) throws Exception {
final LoadBalancedRetryPolicy retryPolicy = loadBalancedRetryPolicyFactory.create(this.getClientName(), this);
RetryCallback<OkHttpRibbonResponse, Exception> retryCallback = new RetryCallback<OkHttpRibbonResponse, Exception>() {
@Override
public OkHttpRibbonResponse doWithRetry(RetryContext context) throws Exception {
//on retries the policy will choose the server and set it in the context
//extract the server and update the request being made
OkHttpRibbonRequest newRequest = ribbonRequest;
if(context instanceof LoadBalancedRetryContext) {
ServiceInstance service = ((LoadBalancedRetryContext)context).getServiceInstance();
if(service != null) {
//Reconstruct the request URI using the host and port set in the retry context
newRequest = newRequest.withNewUri(new URI(service.getUri().getScheme(),
newRequest.getURI().getUserInfo(), service.getHost(), service.getPort(),
newRequest.getURI().getPath(), newRequest.getURI().getQuery(),
newRequest.getURI().getFragment()));
}
}
if (isSecure(configOverride)) {
final URI secureUri = UriComponentsBuilder.fromUri(newRequest.getUri())
.scheme("https").build().toUri();
newRequest = newRequest.withNewUri(secureUri);
}
OkHttpClient httpClient = getOkHttpClient(configOverride, secure);
final Request request = newRequest.toRequest();
Response response = httpClient.newCall(request).execute();
if(retryPolicy.retryableStatusCode(response.code())) {
throw new RetryableStatusCodeException(RetryableOkHttpLoadBalancingClient.this.clientName, response.code());
}
return new OkHttpRibbonResponse(response, newRequest.getUri());
}
};
return this.executeWithRetry(ribbonRequest, retryPolicy, retryCallback);
}
@Override
public ServiceInstance choose(String serviceId) {
Server server = this.getLoadBalancer().chooseServer(serviceId);
return new RibbonLoadBalancerClient.RibbonServer(serviceId,
server);
}
@Override
public RequestSpecificRetryHandler getRequestSpecificRetryHandler(OkHttpRibbonRequest request, IClientConfig requestConfig) {
return new RequestSpecificRetryHandler(false, false, RetryHandler.DEFAULT, null);
}
static class RetryPolicy extends FeignRetryPolicy {
public RetryPolicy(HttpRequest request, LoadBalancedRetryPolicy policy, ServiceInstanceChooser serviceInstanceChooser, String serviceName) {
super(request, policy, serviceInstanceChooser, serviceName);
}
}
}