/*
* Copyright 2015 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.feign.ribbon;
import feign.Client;
import feign.Request;
import feign.Response;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.springframework.cloud.netflix.ribbon.ServerIntrospector;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpRequest;
import com.netflix.client.AbstractLoadBalancerAwareClient;
import com.netflix.client.ClientException;
import com.netflix.client.ClientRequest;
import com.netflix.client.IResponse;
import com.netflix.client.RequestSpecificRetryHandler;
import com.netflix.client.RetryHandler;
import com.netflix.client.config.CommonClientConfigKey;
import com.netflix.client.config.IClientConfig;
import com.netflix.loadbalancer.ILoadBalancer;
import com.netflix.loadbalancer.Server;
import static org.springframework.cloud.netflix.ribbon.RibbonUtils.updateToHttpsIfNeeded;
public class FeignLoadBalancer extends
AbstractLoadBalancerAwareClient<FeignLoadBalancer.RibbonRequest, FeignLoadBalancer.RibbonResponse> {
protected int connectTimeout;
protected int readTimeout;
protected IClientConfig clientConfig;
protected ServerIntrospector serverIntrospector;
public FeignLoadBalancer(ILoadBalancer lb, IClientConfig clientConfig,
ServerIntrospector serverIntrospector) {
super(lb, clientConfig);
this.setRetryHandler(RetryHandler.DEFAULT);
this.clientConfig = clientConfig;
this.connectTimeout = clientConfig.get(CommonClientConfigKey.ConnectTimeout);
this.readTimeout = clientConfig.get(CommonClientConfigKey.ReadTimeout);
this.serverIntrospector = serverIntrospector;
}
@Override
public RibbonResponse execute(RibbonRequest request, IClientConfig configOverride)
throws IOException {
Request.Options options;
if (configOverride != null) {
options = new Request.Options(
configOverride.get(CommonClientConfigKey.ConnectTimeout,
this.connectTimeout),
(configOverride.get(CommonClientConfigKey.ReadTimeout,
this.readTimeout)));
}
else {
options = new Request.Options(this.connectTimeout, this.readTimeout);
}
Response response = request.client().execute(request.toRequest(), options);
return new RibbonResponse(request.getUri(), response);
}
@Override
public RequestSpecificRetryHandler getRequestSpecificRetryHandler(
RibbonRequest request, IClientConfig requestConfig) {
if (this.clientConfig.get(CommonClientConfigKey.OkToRetryOnAllOperations,
false)) {
return new RequestSpecificRetryHandler(true, true, this.getRetryHandler(),
requestConfig);
}
if (!request.toRequest().method().equals("GET")) {
return new RequestSpecificRetryHandler(true, false, this.getRetryHandler(),
requestConfig);
}
else {
return new RequestSpecificRetryHandler(true, true, this.getRetryHandler(),
requestConfig);
}
}
@Override
public URI reconstructURIWithServer(Server server, URI original) {
URI uri = updateToHttpsIfNeeded(original, this.clientConfig, this.serverIntrospector, server);
return super.reconstructURIWithServer(server, uri);
}
static class RibbonRequest extends ClientRequest implements Cloneable {
private final Request request;
private final Client client;
RibbonRequest(Client client, Request request, URI uri) {
this.client = client;
setUri(uri);
this.request = toRequest(request);
}
private Request toRequest(Request request) {
Map<String, Collection<String>> headers = new LinkedHashMap<>(
request.headers());
return Request.create(request.method(),getUri().toASCIIString(),headers,request.body(),request.charset());
}
Request toRequest() {
return toRequest(this.request);
}
Client client() {
return this.client;
}
HttpRequest toHttpRequest() {
return new HttpRequest() {
@Override
public HttpMethod getMethod() {
return HttpMethod.resolve(RibbonRequest.this.toRequest().method());
}
@Override
public URI getURI() {
return RibbonRequest.this.getUri();
}
@Override
public HttpHeaders getHeaders() {
Map<String, List<String>> headers = new HashMap<String, List<String>>();
Map<String, Collection<String>> feignHeaders = RibbonRequest.this.toRequest().headers();
for(String key : feignHeaders.keySet()) {
headers.put(key, new ArrayList<String>(feignHeaders.get(key)));
}
HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.putAll(headers);
return httpHeaders;
}
};
}
@Override
public Object clone() {
return new RibbonRequest(this.client, this.request, getUri());
}
}
static class RibbonResponse implements IResponse {
private final URI uri;
private final Response response;
RibbonResponse(URI uri, Response response) {
this.uri = uri;
this.response = response;
}
@Override
public Object getPayload() throws ClientException {
return this.response.body();
}
@Override
public boolean hasPayload() {
return this.response.body() != null;
}
@Override
public boolean isSuccess() {
return this.response.status() == 200;
}
@Override
public URI getRequestedURI() {
return this.uri;
}
@Override
public Map<String, Collection<String>> getHeaders() {
return this.response.headers();
}
Response toResponse() {
return this.response;
}
@Override
public void close() throws IOException {
if (this.response != null && this.response.body() != null) {
this.response.body().close();
}
}
}
}