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package trans
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import (
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"context"
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"fmt"
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"os"
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"sort"
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"strings"
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"time"
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"github.com/didi/nightingale/v5/config"
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"github.com/didi/nightingale/v5/models"
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"github.com/didi/nightingale/v5/naming"
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"github.com/didi/nightingale/v5/pkg/ipool"
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"github.com/toolkits/pkg/logger"
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)
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var connPools *ipool.ConnPools
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var svcsCache string
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func Start(ctx context.Context) {
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// 初始化本包的数据结构，然后启动一个goroutine，周期性获取活着的judge实例，更新相应的pool、queue等
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judgeConf := config.Config.Judge
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connPools = ipool.NewConnPools(judgeConf.ConnMax, judgeConf.ConnIdle, judgeConf.ConnTimeout, judgeConf.CallTimeout, []string{})
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if err := syncInstances(); err != nil {
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fmt.Println("syncInstances fail:", err)
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logger.Close()
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os.Exit(1)
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}
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go loopSyncInstances()
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}
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func loopSyncInstances() {
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interval := time.Duration(config.Config.Heartbeat.Interval) * time.Millisecond
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for {
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time.Sleep(interval)
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if err := syncInstances(); err != nil {
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logger.Warning("syncInstances fail:", err)
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}
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}
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}
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func syncInstances() error {
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// 获取当前活着的所有实例
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instances, err := models.InstanceGetAlive(config.EndpointName)
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if err != nil {
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logger.Warningf("mysql.error: get alive server instances fail: %v", err)
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return err
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}
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// 排序，便于与内存中的实例列表做差别判断
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sort.Strings(instances)
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// 如果列表变化，就去处理，并且要更新内存变量serverStr
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newSvcs := strings.Join(instances, ",")
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if newSvcs != svcsCache {
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// 如果有新实例，创建对应的连接池，如果实例少了，删掉没用的连接池
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connPools.UpdatePools(instances)
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// 如果有新实例，创建对应的Queue，如果实例少了，删掉对应的Queue
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queues.Update(instances)
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// 重建哈希环
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naming.RebuildConsistentHashRing(instances)
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svcsCache = newSvcs
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}
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return nil
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}
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