dubbo.apache.org/dubbo-go/v3@v3.1.1/common/extension/service_discovery.go (about)

     1  /*
     2   * Licensed to the Apache Software Foundation (ASF) under one or more
     3   * contributor license agreements.  See the NOTICE file distributed with
     4   * this work for additional information regarding copyright ownership.
     5   * The ASF licenses this file to You under the Apache License, Version 2.0
     6   * (the "License"); you may not use this file except in compliance with
     7   * the License.  You may obtain a copy of the License at
     8   *
     9   *     http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17  
    18  package extension
    19  
    20  import (
    21  	perrors "github.com/pkg/errors"
    22  )
    23  
    24  import (
    25  	"dubbo.apache.org/dubbo-go/v3/common"
    26  	"dubbo.apache.org/dubbo-go/v3/common/constant"
    27  	"dubbo.apache.org/dubbo-go/v3/registry"
    28  )
    29  
    30  var discoveryCreatorMap = make(map[string]func(url *common.URL) (registry.ServiceDiscovery, error), 4)
    31  
    32  // SetServiceDiscovery will store the @creator and @name
    33  // protocol indicate the implementation, like nacos
    34  // the name like nacos-1...
    35  func SetServiceDiscovery(protocol string, creator func(url *common.URL) (registry.ServiceDiscovery, error)) {
    36  	discoveryCreatorMap[protocol] = creator
    37  }
    38  
    39  // GetServiceDiscovery will return the registry.ServiceDiscovery
    40  // protocol indicate the implementation, like nacos
    41  // the name like nacos-1...
    42  // if not found, or initialize instance failed, it will return error.
    43  func GetServiceDiscovery(url *common.URL) (registry.ServiceDiscovery, error) {
    44  	protocol := url.GetParam(constant.RegistryKey, "")
    45  	creator, ok := discoveryCreatorMap[protocol]
    46  	if !ok {
    47  		return nil, perrors.New("Could not find the service discovery with discovery protocol: " + protocol)
    48  	}
    49  	return creator(url)
    50  }