github.com/polarismesh/polaris@v1.17.8/config/connection_manager.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 config
    19  
    20  import (
    21  	"context"
    22  	"sync"
    23  	"time"
    24  
    25  	apiconfig "github.com/polarismesh/specification/source/go/api/v1/config_manage"
    26  
    27  	api "github.com/polarismesh/polaris/common/api/v1"
    28  	"github.com/polarismesh/polaris/common/hash"
    29  	"github.com/polarismesh/polaris/common/utils"
    30  )
    31  
    32  const (
    33  	defaultLongPollingTimeout = 30000 * time.Millisecond
    34  )
    35  
    36  type ClientConn struct {
    37  	once             sync.Once
    38  	finishTime       time.Time
    39  	finishChan       chan *apiconfig.ConfigClientResponse
    40  	watchConfigFiles []*apiconfig.ClientConfigFileInfo
    41  }
    42  
    43  func (c *ClientConn) reply(rsp *apiconfig.ConfigClientResponse) {
    44  	c.once.Do(func() {
    45  		c.finishChan <- rsp
    46  		close(c.finishChan)
    47  	})
    48  }
    49  
    50  type connManager struct {
    51  	watchCenter    *watchCenter
    52  	conns          *utils.SegmentMap[string, *ClientConn] // client -> ClientConn
    53  	stopWorkerFunc context.CancelFunc
    54  }
    55  
    56  var (
    57  	notModifiedResponse = &apiconfig.ConfigClientResponse{
    58  		Code:       utils.NewUInt32Value(api.DataNoChange),
    59  		ConfigFile: nil,
    60  	}
    61  
    62  	cm *connManager
    63  )
    64  
    65  // NewConfigConnManager 初始化连接管理器，定时响应超时的请求
    66  func NewConfigConnManager(ctx context.Context, watchCenter *watchCenter) *connManager {
    67  	cm = &connManager{
    68  		conns:       utils.NewSegmentMap[string, *ClientConn](128, hash.Fnv32),
    69  		watchCenter: watchCenter,
    70  	}
    71  
    72  	go cm.startHandleTimeoutRequestWorker(ctx)
    73  
    74  	return cm
    75  }
    76  
    77  func (c *connManager) AddConn(
    78  	clientId string, files []*apiconfig.ClientConfigFileInfo) chan *apiconfig.ConfigClientResponse {
    79  
    80  	finishChan := make(chan *apiconfig.ConfigClientResponse)
    81  
    82  	cm.conns.Put(clientId, &ClientConn{
    83  		finishTime:       time.Now().Add(defaultLongPollingTimeout),
    84  		finishChan:       finishChan,
    85  		watchConfigFiles: files,
    86  	})
    87  
    88  	c.watchCenter.AddWatcher(clientId, files, func(clientId string, rsp *apiconfig.ConfigClientResponse) bool {
    89  		if conn, ok := cm.conns.Get(clientId); ok {
    90  			conn.reply(rsp)
    91  			c.removeConn(clientId)
    92  		}
    93  		return true
    94  	})
    95  
    96  	return finishChan
    97  }
    98  
    99  func (c *connManager) removeConn(clientId string) {
   100  	conn, ok := cm.conns.Get(clientId)
   101  	if !ok {
   102  		return
   103  	}
   104  	c.watchCenter.RemoveWatcher(clientId, conn.watchConfigFiles)
   105  	cm.conns.Del(clientId)
   106  }
   107  
   108  func (c *connManager) startHandleTimeoutRequestWorker(ctx context.Context) {
   109  	t := time.NewTicker(time.Second)
   110  	defer t.Stop()
   111  	for {
   112  		select {
   113  		case <-ctx.Done():
   114  			return
   115  		case <-t.C:
   116  			if cm.conns == nil {
   117  				continue
   118  			}
   119  			tNow := time.Now()
   120  			cm.conns.Range(func(client string, conn *ClientConn) {
   121  				if tNow.After(conn.finishTime) {
   122  					conn.reply(notModifiedResponse)
   123  					c.removeConn(client)
   124  				}
   125  			})
   126  		}
   127  	}
   128  }