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com.github.linyuzai.dynamicfeign.factory.DynamicFeignClientFactoryBean Maven / Gradle / Ivy
package com.github.linyuzai.dynamicfeign.factory;
import java.util.Map;
import java.util.Objects;
import com.github.linyuzai.dynamicfeign.mapper.DynamicFeignClientMapper;
import com.github.linyuzai.dynamicfeign.proxy.DynamicFeignProxy;
import com.github.linyuzai.dynamicfeign.targeter.FakeTargeter;
import com.github.linyuzai.dynamicfeign.targeter.Targeter;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.cloud.openfeign.FeignClientProperties;
import org.springframework.cloud.openfeign.FeignContext;
import org.springframework.cloud.openfeign.FeignLoggerFactory;
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;
public class DynamicFeignClientFactoryBean implements FactoryBean, 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
configureFeign(context, builder);
return builder;
}
protected void configureFeign(FeignContext context, Feign.Builder builder) {
FeignClientProperties properties = applicationContext.getBean(FeignClientProperties.class);
if (properties != null) {
if (properties.isDefaultToProperties()) {
configureUsingConfiguration(context, builder);
configureUsingProperties(properties.getConfig().get(properties.getDefaultConfig()), builder);
configureUsingProperties(properties.getConfig().get(this.name), builder);
} else {
configureUsingProperties(properties.getConfig().get(properties.getDefaultConfig()), builder);
configureUsingProperties(properties.getConfig().get(this.name), builder);
configureUsingConfiguration(context, builder);
}
} else {
configureUsingConfiguration(context, builder);
}
}
protected void configureUsingConfiguration(FeignContext context, Feign.Builder builder) {
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 requestInterceptors = context.getInstances(
this.name, RequestInterceptor.class);
if (requestInterceptors != null) {
builder.requestInterceptors(requestInterceptors.values());
}
if (decode404) {
builder.decode404();
}
}
protected void configureUsingProperties(FeignClientProperties.FeignClientConfiguration config, Feign.Builder builder) {
if (config == null) {
return;
}
if (config.getLoggerLevel() != null) {
builder.logLevel(config.getLoggerLevel());
}
if (config.getConnectTimeout() != null && config.getReadTimeout() != null) {
builder.options(new Request.Options(config.getConnectTimeout(), config.getReadTimeout()));
}
if (config.getRetryer() != null) {
Retryer retryer = getOrInstantiate(config.getRetryer());
builder.retryer(retryer);
}
if (config.getErrorDecoder() != null) {
ErrorDecoder errorDecoder = getOrInstantiate(config.getErrorDecoder());
builder.errorDecoder(errorDecoder);
}
if (config.getRequestInterceptors() != null && !config.getRequestInterceptors().isEmpty()) {
// this will add request interceptor to builder, not replace existing
for (Class bean : config.getRequestInterceptors()) {
RequestInterceptor interceptor = getOrInstantiate(bean);
builder.requestInterceptor(interceptor);
}
}
if (config.getDecode404() != null) {
if (config.getDecode404()) {
builder.decode404();
}
}
if (Objects.nonNull(config.getEncoder())) {
builder.encoder(getOrInstantiate(config.getEncoder()));
}
if (Objects.nonNull(config.getDecoder())) {
builder.decoder(getOrInstantiate(config.getDecoder()));
}
if (Objects.nonNull(config.getContract())) {
builder.contract(getOrInstantiate(config.getContract()));
}
}
private T getOrInstantiate(Class tClass) {
try {
return applicationContext.getBean(tClass);
} catch (NoSuchBeanDefinitionException e) {
return BeanUtils.instantiateClass(tClass);
}
}
protected T get(FeignContext context, Class 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 getOptional(FeignContext context, Class type) {
return context.getInstance(this.name, type);
}
protected T loadBalance(Feign.Builder builder, FeignContext context,
HardCodedTarget 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-netflix-ribbon?");
}
@Override
public F getObject() throws Exception {
return getTarget();
}
/**
* @return a {@link Feign} client created with the specified data and the context information
*/
F getTarget() throws ClassNotFoundException {
FeignContext context = applicationContext.getBean(FeignContext.class);
Feign.Builder builder = feign(context);
Client client = getOptional(context, Client.class);
Targeter targeter = FakeTargeter.fake(get(context, Class.forName("org.springframework.cloud.openfeign.Targeter")));
DynamicFeignClientMapper.ConfigurableFeignClient feignClient =
new DynamicFeignClientMapper.ConfigurableFeignClient(context, builder, client, targeter, this);
feignClient.getEntity().setFeignOut(false);
feignClient.getEntity().setFeignMethod(false);
feignClient.getEntity().setKey(this.name);
feignClient.getEntity().setType(this.type);
feignClient.getEntity().setInUrl("http://" + this.name);
if (StringUtils.hasText(this.url)) {
feignClient.getEntity().setOutUrl(this.url);
}
DynamicFeignClientMapper.add(feignClient);
return new DynamicFeignProxy<>(type, feignClient).get();
}
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;
}
public Class getType() {
return type;
}
public void setType(Class type) {
this.type = type;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getPath() {
return path;
}
public void setPath(String path) {
this.path = path;
}
public boolean isDecode404() {
return decode404;
}
public void setDecode404(boolean decode404) {
this.decode404 = decode404;
}
public ApplicationContext getApplicationContext() {
return applicationContext;
}
public Class getFallback() {
return fallback;
}
public void setFallback(Class fallback) {
this.fallback = fallback;
}
public Class getFallbackFactory() {
return fallbackFactory;
}
public void setFallbackFactory(Class fallbackFactory) {
this.fallbackFactory = fallbackFactory;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
DynamicFeignClientFactoryBean that = (DynamicFeignClientFactoryBean) o;
return Objects.equals(applicationContext, that.applicationContext) &&
decode404 == that.decode404 &&
Objects.equals(fallback, that.fallback) &&
Objects.equals(fallbackFactory, that.fallbackFactory) &&
Objects.equals(name, that.name) &&
Objects.equals(path, that.path) &&
Objects.equals(type, that.type) &&
Objects.equals(url, that.url);
}
@Override
public int hashCode() {
return Objects.hash(applicationContext, decode404, fallback, fallbackFactory,
name, path, type, url);
}
@Override
public String toString() {
return "DynamicFeignClientFactoryBean{" +
"type=" + type + ", " +
"name='" + name + "', " +
"url='" + url + "', " +
"path='" + path + "', " +
"decode404=" + decode404 + ", " +
"applicationContext=" + applicationContext + ", " +
"fallback=" + fallback + ", " +
"fallbackFactory=" + fallbackFactory +
"}";
}
}
