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RibbonClient.java
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/**
* Copyright 2012-2020 The Feign 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 feign.ribbon;
import com.netflix.client.ClientException;
import com.netflix.client.config.CommonClientConfigKey;
import com.netflix.client.config.DefaultClientConfigImpl;
import feign.Client;
import feign.Request;
import feign.Response;
import java.io.IOException;
import java.net.URI;
/**
* RibbonClient can be used in Feign builder to activate smart routing and resiliency capabilities
* provided by Ribbon. Ex.
*
* <pre>
* MyService api = Feign.builder.client(RibbonClient.create()).target(MyService.class,
* "http://myAppProd");
* </pre>
*
* Where {@code myAppProd} is the ribbon client name and {@code myAppProd.ribbon.listOfServers}
* configuration is set.
*/
public class RibbonClient implements Client {
private final Client delegate;
private final LBClientFactory lbClientFactory;
public static RibbonClient create() {
return builder().build();
}
public static Builder builder() {
return new Builder();
}
/**
* @deprecated Use the {@link RibbonClient#create()}
*/
@Deprecated
public RibbonClient() {
this(new Client.Default(null, null));
}
/**
* @deprecated Use the {@link RibbonClient#create()}
*/
@Deprecated
public RibbonClient(Client delegate) {
this(delegate, new LBClientFactory.Default());
}
RibbonClient(Client delegate, LBClientFactory lbClientFactory) {
this.delegate = delegate;
this.lbClientFactory = lbClientFactory;
}
@Override
public Response execute(Request request, Request.Options options) throws IOException {
try {
URI asUri = URI.create(request.url());
String clientName = asUri.getHost();
URI uriWithoutHost = cleanUrl(request.url(), clientName);
LBClient.RibbonRequest ribbonRequest =
new LBClient.RibbonRequest(delegate, request, uriWithoutHost);
return lbClient(clientName).executeWithLoadBalancer(ribbonRequest,
new FeignOptionsClientConfig(options)).toResponse();
} catch (ClientException e) {
propagateFirstIOException(e);
throw new RuntimeException(e);
}
}
static void propagateFirstIOException(Throwable throwable) throws IOException {
while (throwable != null) {
if (throwable instanceof IOException) {
throw (IOException) throwable;
}
throwable = throwable.getCause();
}
}
static URI cleanUrl(String originalUrl, String host) {
return URI.create(originalUrl.replaceFirst(host, ""));
}
private LBClient lbClient(String clientName) {
return lbClientFactory.create(clientName);
}
static class FeignOptionsClientConfig extends DefaultClientConfigImpl {
public FeignOptionsClientConfig(Request.Options options) {
setProperty(CommonClientConfigKey.ConnectTimeout, options.connectTimeoutMillis());
setProperty(CommonClientConfigKey.ReadTimeout, options.readTimeoutMillis());
setProperty(CommonClientConfigKey.FollowRedirects, options.isFollowRedirects());
}
@Override
public void loadProperties(String clientName) {
}
@Override
public void loadDefaultValues() {
}
}
public static final class Builder {
Builder() {}
private Client delegate;
private LBClientFactory lbClientFactory;
public Builder delegate(Client delegate) {
this.delegate = delegate;
return this;
}
public Builder lbClientFactory(LBClientFactory lbClientFactory) {
this.lbClientFactory = lbClientFactory;
return this;
}
public RibbonClient build() {
return new RibbonClient(
delegate != null ? delegate : new Client.Default(null, null),
lbClientFactory != null ? lbClientFactory : new LBClientFactory.Default());
}
}
}