dubbo.apache.org/dubbo-go/v3@v3.1.1/registry/event/protocol_ports_metadata_customizer.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 event
    19  
    20  import (
    21  	"encoding/json"
    22  	"strconv"
    23  )
    24  
    25  import (
    26  	"github.com/dubbogo/gost/log/logger"
    27  )
    28  
    29  import (
    30  	"dubbo.apache.org/dubbo-go/v3/common/constant"
    31  	"dubbo.apache.org/dubbo-go/v3/common/extension"
    32  	"dubbo.apache.org/dubbo-go/v3/metadata/service/local"
    33  	"dubbo.apache.org/dubbo-go/v3/registry"
    34  )
    35  
    36  func init() {
    37  	extension.AddCustomizers(&ProtocolPortsMetadataCustomizer{})
    38  }
    39  
    40  // ProtocolPortsMetadataCustomizer will update the endpoints
    41  type ProtocolPortsMetadataCustomizer struct {
    42  }
    43  
    44  // GetPriority will return 0, which means it will be invoked at the beginning
    45  func (p *ProtocolPortsMetadataCustomizer) GetPriority() int {
    46  	return 0
    47  }
    48  
    49  // Customize put the the string like [{"protocol": "dubbo", "port": 123}] into instance's metadata
    50  func (p *ProtocolPortsMetadataCustomizer) Customize(instance registry.ServiceInstance) {
    51  	metadataService, err := local.GetLocalMetadataService()
    52  	if err != nil {
    53  		logger.Errorf("Could not init the MetadataService", err)
    54  		return
    55  	}
    56  
    57  	// 4 is enough... we don't have many protocol
    58  	protocolMap := make(map[string]int, 4)
    59  
    60  	list, err := metadataService.GetExportedServiceURLs()
    61  	if list == nil || len(list) == 0 || err != nil {
    62  		logger.Debugf("Could not find exported urls", err)
    63  		return
    64  	}
    65  
    66  	for _, u := range list {
    67  		if err != nil || len(u.Protocol) == 0 {
    68  			logger.Errorf("the url string is invalid: %s", u, err)
    69  			continue
    70  		}
    71  
    72  		port, err := strconv.Atoi(u.Port)
    73  		if err != nil {
    74  			logger.Errorf("Could not customize the metadata of port. ", err)
    75  		}
    76  		protocolMap[u.Protocol] = port
    77  	}
    78  
    79  	instance.GetMetadata()[constant.ServiceInstanceEndpoints] = endpointsStr(protocolMap)
    80  }
    81  
    82  // endpointsStr convert the map to json like [{"protocol": "dubbo", "port": 123}]
    83  func endpointsStr(protocolMap map[string]int) string {
    84  	if len(protocolMap) == 0 {
    85  		return ""
    86  	}
    87  
    88  	endpoints := make([]registry.Endpoint, 0, len(protocolMap))
    89  	for k, v := range protocolMap {
    90  		endpoints = append(endpoints, registry.Endpoint{
    91  			Port:     v,
    92  			Protocol: k,
    93  		})
    94  	}
    95  
    96  	str, err := json.Marshal(endpoints)
    97  	if err != nil {
    98  		logger.Errorf("could not convert the endpoints to json", err)
    99  		return ""
   100  	}
   101  	return string(str)
   102  }