聊聊springcloud项目同时存在多个注册中心客户端采坑记

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

Field registration in org.springframework.cloud.client.serviceregistry.ServiceRegistryAutoConfiguration$ServiceRegistryEndpointConfiguration required a single bean, but 2 were found:
  - nacosRegistration: defined by method 'nacosRegistration' in class path resource [com/alibaba/cloud/nacos/NacosDiscoveryAutoConfiguration.class]
  - eurekaRegistration: defined in BeanDefinition defined in class path resource [org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.class]

Field registration in org.springframework.cloud.client.serviceregistry.ServiceRegistryAutoConfiguration$ServiceRegistryEndpointConfiguration required a single bean, but 2 were found:
  - nacosRegistration: defined by method 'nacosRegistration' in class path resource [com/alibaba/cloud/nacos/NacosDiscoveryAutoConfiguration.class]
  - eurekaRegistration: defined in BeanDefinition defined in class path resource [org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.class

protected AutoConfigurationEntry getAutoConfigurationEntry(AutoConfigurationMetadata autoConfigurationMetadata,
      AnnotationMetadata annotationMetadata) {
    if (!isEnabled(annotationMetadata)) {
      return EMPTY_ENTRY;
    }
    AnnotationAttributes attributes = getAttributes(annotationMetadata);
    List<String> configurations = getCandidateConfigurations(annotationMetadata, attributes);
    configurations = removeDuplicates(configurations);
    Set<String> exclusions = getExclusions(annotationMetadata, attributes);
    checkExcludedClasses(configurations, exclusions);
    configurations.removeAll(exclusions);
    configurations = filter(configurations, autoConfigurationMetadata);
    fireAutoConfigurationImportEvents(configurations, exclusions);
    return new AutoConfigurationEntry(configurations, exclusions);
  }

private List<String> filter(List<String> configurations, AutoConfigurationMetadata autoConfigurationMetadata) {
    long startTime = System.nanoTime();
    String[] candidates = StringUtils.toStringArray(configurations);
    boolean[] skip = new boolean[candidates.length];
    boolean skipped = false;
    for (AutoConfigurationImportFilter filter : getAutoConfigurationImportFilters()) {
      invokeAwareMethods(filter);
      boolean[] match = filter.match(candidates, autoConfigurationMetadata);
      for (int i = 0; i < match.length; i++) {
        if (!match[i]) {
          skip[i] = true;
          candidates[i] = null;
          skipped = true;
        }
      }
    }
    if (!skipped) {
      return configurations;
    }
    List<String> result = new ArrayList<>(candidates.length);
    for (int i = 0; i < candidates.length; i++) {
      if (!skip[i]) {
        result.add(candidates[i]);
      }
    }
    if (logger.isTraceEnabled()) {
      int numberFiltered = configurations.size() - result.size();
      logger.trace("Filtered " + numberFiltered + " auto configuration class in "
          + TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startTime) + " ms");
    }
    return new ArrayList<>(result);
  }

public class RegistrationCenterAutoConfigurationImportFilter implements AutoConfigurationImportFilter, EnvironmentAware {

    private Environment environment;

    /**
     * 因为springboot自动装配，默认会把spring.factories的配置的类先全部加载到候选集合中，
     * 因此当我们代码配置启用nacos，则需把其他注册中心，比如eureka先从候选集合排除
     * @param autoConfigurationClasses
     * @param autoConfigurationMetadata
     * @return
     */
    @Override
    public boolean[] match(String[] autoConfigurationClasses, AutoConfigurationMetadata autoConfigurationMetadata) {
        Set<String> activeProfiles = Arrays.stream(environment.getActiveProfiles()).collect(Collectors.toSet());

        if(activeProfiles.contains(RegistrationCenterConstants.ACTIVE_PROFILE_NACOS)){
            return excludeMissMatchRegistrationAutoConfiguration(autoConfigurationClasses, new String[]{RegistrationCenterConstants.EUREKA_AUTO_CONFIGURATION_CLASSES});

        }else if (activeProfiles.contains(RegistrationCenterConstants.ACTIVE_PROFILE_EUREKA)){
            return excludeMissMatchRegistrationAutoConfiguration(autoConfigurationClasses, new String[]{RegistrationCenterConstants.NACOS_DISCOVERY_AUTO_CONFIGURATION_CLASSES,RegistrationCenterConstants.NACOS_DISCOVERY_CLIENT_AUTO_CONFIGURATION_CLASSES,RegistrationCenterConstants.NACOS_DISCOVERY_ENDPOINT_AUTO_CONFIGURATION_CLASSES});
        }


        return new boolean[0];
    }

    private boolean[] excludeMissMatchRegistrationAutoConfiguration(String[] autoConfigurationClasses,String[] needExcludeRegistrationAutoConfigurationClasse) {
        Map<String,Boolean> needExcludeRegistrationAutoConfigurationClzMap = initNeedExcludeRegistrationAutoConfigurationClzMap(needExcludeRegistrationAutoConfigurationClasse);
        boolean[] match = new boolean[autoConfigurationClasses.length];
        for (int i = 0; i < autoConfigurationClasses.length; i++) {
            String autoConfigurationClz = autoConfigurationClasses[i];
            match[i] = !needExcludeRegistrationAutoConfigurationClzMap.containsKey(autoConfigurationClz);

        }

        return match;
    }

    private Map<String,Boolean> initNeedExcludeRegistrationAutoConfigurationClzMap(String[] needExcludeRegistrationAutoConfigurationClasse){
        Map<String,Boolean> needExcludeRegistrationAutoConfigurationClzMap = new HashMap<>();
        for (String needExcludeRegistrationAutoConfigurationClz : needExcludeRegistrationAutoConfigurationClasse) {
            needExcludeRegistrationAutoConfigurationClzMap.put(needExcludeRegistrationAutoConfigurationClz,false);
        }

        return needExcludeRegistrationAutoConfigurationClzMap;

    }

    @Override
    public void setEnvironment(Environment environment) {
         this.environment = environment;
    }


}

org.springframework.boot.autoconfigure.AutoConfigurationImportFilter=\
com.github.lybgeek.registration.autoconfigure.filter.RegistrationCenterAutoConfigurationImportFilter

spring:
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848

# 禁用eureka客户端自动注册
eureka:
  client:
    enabled: false

spring:
  application:
    name: springboot-registration-client
  profiles:
    active: nacos