github.com/polarismesh/polaris@v1.17.8/service/event.go (about)

     1  /**
     2   * Tencent is pleased to support the open source community by making Polaris available.
     3   *
     4   * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
     5   *
     6   * Licensed under the BSD 3-Clause License (the "License");
     7   * you may not use this file except in compliance with the License.
     8   * You may obtain a copy of the License at
     9   *
    10   * https://opensource.org/licenses/BSD-3-Clause
    11   *
    12   * Unless required by applicable law or agreed to in writing, software distributed
    13   * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
    14   * CONDITIONS OF ANY KIND, either express or implied. See the License for the
    15   * specific language governing permissions and limitations under the License.
    16   */
    17  
    18  package service
    19  
    20  import (
    21  	"context"
    22  	"time"
    23  
    24  	"github.com/polarismesh/polaris/common/model"
    25  )
    26  
    27  type serviceNameResolver func(string) *model.Service
    28  
    29  const maxRetryGetServiceName = 5
    30  
    31  type BaseInstanceEventHandler struct {
    32  	namingServer DiscoverServer
    33  	svcResolver  serviceNameResolver
    34  }
    35  
    36  func NewBaseInstanceEventHandler(namingServer DiscoverServer) *BaseInstanceEventHandler {
    37  	eventHandler := &BaseInstanceEventHandler{namingServer: namingServer}
    38  	eventHandler.svcResolver = eventHandler.resolveService
    39  	return eventHandler
    40  }
    41  
    42  func (b *BaseInstanceEventHandler) resolveService(svcId string) *model.Service {
    43  	return b.namingServer.Cache().Service().GetServiceByID(svcId)
    44  }
    45  
    46  // PreProcess do preprocess logic for event
    47  func (b *BaseInstanceEventHandler) PreProcess(ctx context.Context, value any) any {
    48  	instEvent, ok := value.(model.InstanceEvent)
    49  	if !ok {
    50  		return value
    51  	}
    52  	b.resolveServiceName(&instEvent)
    53  	return instEvent
    54  }
    55  
    56  func (b *BaseInstanceEventHandler) resolveServiceName(event *model.InstanceEvent) {
    57  	if len(event.Service) == 0 && len(event.SvcId) > 0 {
    58  		for i := 0; i < maxRetryGetServiceName; i++ {
    59  			svcObject := b.svcResolver(event.SvcId)
    60  			if nil == svcObject {
    61  				time.Sleep(500 * time.Millisecond)
    62  				continue
    63  			}
    64  			event.Service = svcObject.Name
    65  			event.Namespace = svcObject.Namespace
    66  			break
    67  		}
    68  	}
    69  }