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♻️ 重构 feign 导入支持单体版本通过SPI 导入
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@ -34,6 +34,7 @@ import org.springframework.core.env.Environment;
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import org.springframework.core.io.support.SpringFactoriesLoader;
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import org.springframework.core.type.AnnotationMetadata;
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import org.springframework.lang.Nullable;
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import org.springframework.util.ClassUtils;
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import org.springframework.util.StringUtils;
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import java.util.ArrayList;
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@ -48,199 +49,228 @@ import java.util.Map;
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*/
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public class PigFeignClientsRegistrar implements ImportBeanDefinitionRegistrar, BeanClassLoaderAware, EnvironmentAware {
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@Getter
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private ClassLoader beanClassLoader;
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private final static String BASE_URL = "http://127.0.0.1:${server.port}${server.servlet.context-path}";
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@Getter
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private Environment environment;
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@Getter
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private ClassLoader beanClassLoader;
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@Override
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public void registerBeanDefinitions(AnnotationMetadata metadata, BeanDefinitionRegistry registry) {
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registerFeignClients(registry);
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}
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@Getter
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private Environment environment;
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@Override
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public void setBeanClassLoader(ClassLoader classLoader) {
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this.beanClassLoader = classLoader;
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}
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@Override
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public void registerBeanDefinitions(AnnotationMetadata metadata, BeanDefinitionRegistry registry) {
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registerFeignClients(registry);
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}
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private void registerFeignClients(BeanDefinitionRegistry registry) {
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@Override
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public void setBeanClassLoader(ClassLoader classLoader) {
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this.beanClassLoader = classLoader;
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}
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List<String> feignClients = new ArrayList<>(
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SpringFactoriesLoader.loadFactoryNames(getSpringFactoriesLoaderFactoryClass(), getBeanClassLoader()));
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private void registerFeignClients(BeanDefinitionRegistry registry) {
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List<String> feignClients = new ArrayList<>();
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// 支持 springboot 2.7 + 最新版本的配置方式
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ImportCandidates.load(FeignClient.class, getBeanClassLoader()).forEach(feignClients::add);
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// 如果 spring.factories 里为空
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if (feignClients.isEmpty()) {
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return;
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}
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for (String className : feignClients) {
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try {
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Class<?> clazz = beanClassLoader.loadClass(className);
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AnnotationAttributes attributes = AnnotatedElementUtils.getMergedAnnotationAttributes(clazz,
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FeignClient.class);
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if (attributes == null) {
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continue;
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}
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// 如果已经存在该 bean，支持原生的 Feign
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if (registry.containsBeanDefinition(className)) {
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continue;
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}
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registerClientConfiguration(registry, getClientName(attributes), attributes.get("configuration"));
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// 支持 springboot 2.7 + 最新版本的配置方式
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ImportCandidates.load(FeignClient.class, getBeanClassLoader()).forEach(feignClients::add);
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validate(attributes);
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BeanDefinitionBuilder definition = BeanDefinitionBuilder
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.genericBeanDefinition(FeignClientFactoryBean.class);
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definition.addPropertyValue("url", getUrl(attributes));
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definition.addPropertyValue("path", getPath(attributes));
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String name = getName(attributes);
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definition.addPropertyValue("name", name);
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// 如果 spring.factories 里为空
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if (feignClients.isEmpty()) {
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return;
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}
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for (String className : feignClients) {
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try {
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Class<?> clazz = beanClassLoader.loadClass(className);
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AnnotationAttributes attributes = AnnotatedElementUtils.getMergedAnnotationAttributes(clazz,
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FeignClient.class);
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if (attributes == null) {
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continue;
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}
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// 兼容最新版本的 spring-cloud-openfeign，尚未发布
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StringBuilder aliasBuilder = new StringBuilder(18);
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if (attributes.containsKey("contextId")) {
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String contextId = getContextId(attributes);
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aliasBuilder.append(contextId);
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definition.addPropertyValue("contextId", contextId);
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}
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else {
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aliasBuilder.append(name);
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}
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// 如果是单体项目自动注入 & url 为空
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Boolean isMicro = environment.getProperty("spring.cloud.nacos.discovery.enabled", Boolean.class, true);
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// 如果已经存在该 bean，支持原生的 Feign
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if (registry.containsBeanDefinition(className) && isMicro) {
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continue;
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}
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definition.addPropertyValue("type", className);
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definition.addPropertyValue("decode404", attributes.get("decode404"));
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definition.addPropertyValue("fallback", attributes.get("fallback"));
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definition.addPropertyValue("fallbackFactory", attributes.get("fallbackFactory"));
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definition.setAutowireMode(AbstractBeanDefinition.AUTOWIRE_BY_TYPE);
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registerClientConfiguration(registry, getClientName(attributes), className,
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attributes.get("configuration"));
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AbstractBeanDefinition beanDefinition = definition.getBeanDefinition();
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validate(attributes);
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BeanDefinitionBuilder definition = BeanDefinitionBuilder
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.genericBeanDefinition(FeignClientFactoryBean.class);
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definition.addPropertyValue("url", getUrl(registry, attributes));
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definition.addPropertyValue("path", getPath(attributes));
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String name = getName(attributes);
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definition.addPropertyValue("name", name);
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// alias
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String alias = aliasBuilder.append("FeignClient").toString();
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// 兼容最新版本的 spring-cloud-openfeign，尚未发布
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StringBuilder aliasBuilder = new StringBuilder(18);
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if (attributes.containsKey("contextId")) {
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String contextId = getContextId(attributes);
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aliasBuilder.append(contextId);
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definition.addPropertyValue("contextId", contextId);
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} else {
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aliasBuilder.append(name);
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}
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// has a default, won't be null
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boolean primary = (Boolean) attributes.get("primary");
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definition.addPropertyValue("type", className);
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definition.addPropertyValue("dismiss404",
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Boolean.parseBoolean(String.valueOf(attributes.get("dismiss404"))));
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Object fallbackFactory = attributes.get("fallbackFactory");
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if (fallbackFactory != null) {
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definition.addPropertyValue("fallbackFactory", fallbackFactory instanceof Class ? fallbackFactory
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: ClassUtils.resolveClassName(fallbackFactory.toString(), null));
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}
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definition.addPropertyValue("fallbackFactory", attributes.get("fallbackFactory"));
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definition.setAutowireMode(AbstractBeanDefinition.AUTOWIRE_BY_TYPE);
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beanDefinition.setPrimary(primary);
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AbstractBeanDefinition beanDefinition = definition.getBeanDefinition();
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String qualifier = getQualifier(attributes);
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if (StringUtils.hasText(qualifier)) {
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alias = qualifier;
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}
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// alias
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String alias = aliasBuilder.append("FeignClient").toString();
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BeanDefinitionHolder holder = new BeanDefinitionHolder(beanDefinition, className,
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new String[] { alias });
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BeanDefinitionReaderUtils.registerBeanDefinition(holder, registry);
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// has a default, won't be null
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boolean primary = (Boolean) attributes.get("primary");
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}
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catch (ClassNotFoundException e) {
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e.printStackTrace();
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}
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}
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}
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beanDefinition.setPrimary(primary);
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/**
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* Return the class used by {@link SpringFactoriesLoader} to load configuration
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* candidates.
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* @return the factory class
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*/
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private Class<?> getSpringFactoriesLoaderFactoryClass() {
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return PigFeignAutoConfiguration.class;
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}
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String qualifier = getQualifier(attributes);
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if (StringUtils.hasText(qualifier)) {
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alias = qualifier;
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}
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private void validate(Map<String, Object> attributes) {
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AnnotationAttributes annotation = AnnotationAttributes.fromMap(attributes);
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// This blows up if an aliased property is overspecified
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FeignClientsRegistrar.validateFallback(annotation.getClass("fallback"));
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FeignClientsRegistrar.validateFallbackFactory(annotation.getClass("fallbackFactory"));
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}
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BeanDefinitionHolder holder = new BeanDefinitionHolder(beanDefinition, className,
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new String[]{alias});
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BeanDefinitionReaderUtils.registerBeanDefinition(holder, registry);
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private String getName(Map<String, Object> attributes) {
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String name = (String) attributes.get("serviceId");
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if (!StringUtils.hasText(name)) {
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name = (String) attributes.get("name");
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}
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if (!StringUtils.hasText(name)) {
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name = (String) attributes.get("value");
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}
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name = resolve(name);
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return FeignClientsRegistrar.getName(name);
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}
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} catch (ClassNotFoundException e) {
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e.printStackTrace();
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}
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}
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}
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private String getContextId(Map<String, Object> attributes) {
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String contextId = (String) attributes.get("contextId");
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if (!StringUtils.hasText(contextId)) {
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return getName(attributes);
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}
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/**
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* Return the class used by {@link SpringFactoriesLoader} to load configuration
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* candidates.
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*
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* @return the factory class
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*/
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private Class<?> getSpringFactoriesLoaderFactoryClass() {
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return PigFeignAutoConfiguration.class;
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}
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contextId = resolve(contextId);
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return FeignClientsRegistrar.getName(contextId);
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}
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private void validate(Map<String, Object> attributes) {
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AnnotationAttributes annotation = AnnotationAttributes.fromMap(attributes);
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// This blows up if an aliased property is overspecified
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FeignClientsRegistrar.validateFallback(annotation.getClass("fallback"));
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FeignClientsRegistrar.validateFallbackFactory(annotation.getClass("fallbackFactory"));
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}
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private String resolve(String value) {
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if (StringUtils.hasText(value)) {
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return this.environment.resolvePlaceholders(value);
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}
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return value;
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}
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private String getName(Map<String, Object> attributes) {
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String name = (String) attributes.get("serviceId");
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if (!StringUtils.hasText(name)) {
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name = (String) attributes.get("name");
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}
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if (!StringUtils.hasText(name)) {
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name = (String) attributes.get("value");
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}
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name = resolve(name);
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return FeignClientsRegistrar.getName(name);
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}
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private String getUrl(Map<String, Object> attributes) {
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String url = resolve((String) attributes.get("url"));
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return FeignClientsRegistrar.getUrl(url);
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}
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private String getContextId(Map<String, Object> attributes) {
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String contextId = (String) attributes.get("contextId");
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if (!StringUtils.hasText(contextId)) {
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return getName(attributes);
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}
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private String getPath(Map<String, Object> attributes) {
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String path = resolve((String) attributes.get("path"));
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return FeignClientsRegistrar.getPath(path);
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}
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contextId = resolve(contextId);
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return FeignClientsRegistrar.getName(contextId);
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}
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@Nullable
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private String getQualifier(@Nullable Map<String, Object> client) {
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if (client == null) {
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return null;
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}
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String qualifier = (String) client.get("qualifier");
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if (StringUtils.hasText(qualifier)) {
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return qualifier;
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}
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return null;
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}
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private String resolve(String value) {
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if (StringUtils.hasText(value)) {
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return this.environment.resolvePlaceholders(value);
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}
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return value;
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}
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@Nullable
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private String getClientName(@Nullable Map<String, Object> client) {
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if (client == null) {
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return null;
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}
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String value = (String) client.get("contextId");
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if (!StringUtils.hasText(value)) {
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value = (String) client.get("value");
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}
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if (!StringUtils.hasText(value)) {
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value = (String) client.get("name");
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}
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if (!StringUtils.hasText(value)) {
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value = (String) client.get("serviceId");
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}
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if (StringUtils.hasText(value)) {
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return value;
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}
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private String getUrl(BeanDefinitionRegistry registry, Map<String, Object> attributes) {
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throw new IllegalStateException(
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"Either 'name' or 'value' must be provided in @" + FeignClient.class.getSimpleName());
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}
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// 如果是单体项目自动注入 & url 为空
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Boolean isMicro = environment.getProperty("spring.cloud.nacos.discovery.enabled", Boolean.class, true);
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private void registerClientConfiguration(BeanDefinitionRegistry registry, Object name, Object configuration) {
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BeanDefinitionBuilder builder = BeanDefinitionBuilder.genericBeanDefinition(FeignClientSpecification.class);
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builder.addConstructorArgValue(name);
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builder.addConstructorArgValue(configuration);
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registry.registerBeanDefinition(name + "." + FeignClientSpecification.class.getSimpleName(),
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builder.getBeanDefinition());
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}
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if (isMicro) {
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return null;
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}
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@Override
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public void setEnvironment(Environment environment) {
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this.environment = environment;
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}
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String url = resolve(BASE_URL);
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return FeignClientsRegistrar.getUrl(url);
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}
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private String getPath(Map<String, Object> attributes) {
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String path = resolve((String) attributes.get("path"));
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return FeignClientsRegistrar.getPath(path);
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}
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@Nullable
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private String getQualifier(@Nullable Map<String, Object> client) {
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if (client == null) {
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return null;
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}
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String qualifier = (String) client.get("qualifier");
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if (StringUtils.hasText(qualifier)) {
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return qualifier;
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}
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return null;
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}
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@Nullable
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private String getClientName(@Nullable Map<String, Object> client) {
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if (client == null) {
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return null;
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}
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String value = (String) client.get("contextId");
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if (!StringUtils.hasText(value)) {
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value = (String) client.get("value");
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}
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if (!StringUtils.hasText(value)) {
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value = (String) client.get("name");
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}
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if (!StringUtils.hasText(value)) {
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value = (String) client.get("serviceId");
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}
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if (StringUtils.hasText(value)) {
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return value;
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}
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throw new IllegalStateException(
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"Either 'name' or 'value' must be provided in @" + FeignClient.class.getSimpleName());
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}
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private void registerClientConfiguration(BeanDefinitionRegistry registry, Object name, Object configuration) {
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BeanDefinitionBuilder builder = BeanDefinitionBuilder.genericBeanDefinition(FeignClientSpecification.class);
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builder.addConstructorArgValue(name);
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builder.addConstructorArgValue(configuration);
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registry.registerBeanDefinition(name + "." + FeignClientSpecification.class.getSimpleName(),
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builder.getBeanDefinition());
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}
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private void registerClientConfiguration(BeanDefinitionRegistry registry, Object name, Object className,
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Object configuration) {
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BeanDefinitionBuilder builder = BeanDefinitionBuilder.genericBeanDefinition(FeignClientSpecification.class);
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builder.addConstructorArgValue(name);
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builder.addConstructorArgValue(className);
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builder.addConstructorArgValue(configuration);
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registry.registerBeanDefinition(name + "." + FeignClientSpecification.class.getSimpleName(),
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builder.getBeanDefinition());
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}
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@Override
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public void setEnvironment(Environment environment) {
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this.environment = environment;
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}
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}
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