/*
* Copyright 2013-2016 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;
import java.util.Map;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.cloud.netflix.feign.ribbon.LoadBalancerFeignClient;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
import feign.Client;
import feign.Contract;
import feign.Feign;
import feign.Logger;
import feign.Request;
import feign.RequestInterceptor;
import feign.Retryer;
import feign.Target.HardCodedTarget;
import feign.codec.Decoder;
import feign.codec.Encoder;
import feign.codec.ErrorDecoder;
import lombok.Data;
import lombok.EqualsAndHashCode;
/**
* @author Spencer Gibb
* @author Venil Noronha
*/
@Data
@EqualsAndHashCode(callSuper = false)
class FeignClientFactoryBean implements FactoryBean<Object>, InitializingBean,
ApplicationContextAware {
/***********************************
* WARNING! Nothing in this class should be @Autowired. It causes NPEs because of some lifecycle race condition.
***********************************/
private Class<?> type;
private String name;
private String url;
private String path;
private boolean decode404;
private ApplicationContext applicationContext;
private Class<?> fallback = void.class;
private Class<?> fallbackFactory = void.class;
@Override
public void afterPropertiesSet() throws Exception {
Assert.hasText(this.name, "Name must be set");
}
@Override
public void setApplicationContext(ApplicationContext context) throws BeansException {
this.applicationContext = context;
}
protected Feign.Builder feign(FeignContext context) {
FeignLoggerFactory loggerFactory = get(context, FeignLoggerFactory.class);
Logger logger = loggerFactory.create(this.type);
// @formatter:off
Feign.Builder builder = get(context, Feign.Builder.class)
// required values
.logger(logger)
.encoder(get(context, Encoder.class))
.decoder(get(context, Decoder.class))
.contract(get(context, Contract.class));
// @formatter:on
// optional values
Logger.Level level = getOptional(context, Logger.Level.class);
if (level != null) {
builder.logLevel(level);
}
Retryer retryer = getOptional(context, Retryer.class);
if (retryer != null) {
builder.retryer(retryer);
}
ErrorDecoder errorDecoder = getOptional(context, ErrorDecoder.class);
if (errorDecoder != null) {
builder.errorDecoder(errorDecoder);
}
Request.Options options = getOptional(context, Request.Options.class);
if (options != null) {
builder.options(options);
}
Map<String, RequestInterceptor> requestInterceptors = context.getInstances(
this.name, RequestInterceptor.class);
if (requestInterceptors != null) {
builder.requestInterceptors(requestInterceptors.values());
}
if (decode404) {
builder.decode404();
}
return builder;
}
protected <T> T get(FeignContext context, Class<T> type) {
T instance = context.getInstance(this.name, type);
if (instance == null) {
throw new IllegalStateException("No bean found of type " + type + " for "
+ this.name);
}
return instance;
}
protected <T> T getOptional(FeignContext context, Class<T> type) {
return context.getInstance(this.name, type);
}
protected <T> T loadBalance(Feign.Builder builder, FeignContext context,
HardCodedTarget<T> target) {
Client client = getOptional(context, Client.class);
if (client != null) {
builder.client(client);
Targeter targeter = get(context, Targeter.class);
return targeter.target(this, builder, context, target);
}
throw new IllegalStateException(
"No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-ribbon?");
}
@Override
public Object getObject() throws Exception {
FeignContext context = applicationContext.getBean(FeignContext.class);
Feign.Builder builder = feign(context);
if (!StringUtils.hasText(this.url)) {
String url;
if (!this.name.startsWith("http")) {
url = "http://" + this.name;
}
else {
url = this.name;
}
url += cleanPath();
return loadBalance(builder, context, new HardCodedTarget<>(this.type,
this.name, url));
}
if (StringUtils.hasText(this.url) && !this.url.startsWith("http")) {
this.url = "http://" + this.url;
}
String url = this.url + cleanPath();
Client client = getOptional(context, Client.class);
if (client != null) {
if (client instanceof LoadBalancerFeignClient) {
// not lod balancing because we have a url,
// but ribbon is on the classpath, so unwrap
client = ((LoadBalancerFeignClient)client).getDelegate();
}
builder.client(client);
}
Targeter targeter = get(context, Targeter.class);
return targeter.target(this, builder, context, new HardCodedTarget<>(
this.type, this.name, url));
}
private String cleanPath() {
String path = this.path.trim();
if (StringUtils.hasLength(path)) {
if (!path.startsWith("/")) {
path = "/" + path;
}
if (path.endsWith("/")) {
path = path.substring(0, path.length() - 1);
}
}
return path;
}
@Override
public Class<?> getObjectType() {
return this.type;
}
@Override
public boolean isSingleton() {
return true;
}
}