449 lines
10 KiB
Go
449 lines
10 KiB
Go
package discover
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import (
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"fmt"
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"net/http"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"apigo.cc/go/cast"
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gohttp "apigo.cc/go/http"
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"apigo.cc/go/id"
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"apigo.cc/go/log"
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"apigo.cc/go/redis"
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)
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// Discoverer 发现服务实例
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type Discoverer struct {
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config Config
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registry string
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app string
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serverRedisPool *redis.Redis
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clientRedisPool *redis.Redis
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pubsubRedisPool *redis.Redis
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isServer bool
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isClient bool
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daemonRunning atomic.Bool
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myAddr string
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logger *log.Logger
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daemonStopSignal chan struct{}
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daemonDoneSignal chan struct{}
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appLock sync.RWMutex
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calls map[string]CallConfig
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appNodes map[string]map[string]*NodeInfo
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appSubscribed map[string]bool
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appClientPools map[string]*gohttp.Client
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appClientPoolsLock sync.RWMutex
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settedRoute func(*AppClient, *http.Request)
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settedLoadBalancer LoadBalancer
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}
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// IsServer 返回当前节点是否作为服务端运行
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func (d *Discoverer) IsServer() bool { return d.isServer }
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// IsClient 返回当前节点是否作为客户端运行
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func (d *Discoverer) IsClient() bool { return d.isClient }
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func (d *Discoverer) logError(msg string, extra ...any) {
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d.logger.Error("Discover: "+msg, append(extra, "app", d.app, "addr", d.myAddr)...)
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}
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func (d *Discoverer) logInfo(msg string, extra ...any) {
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d.logger.Info("Discover: "+msg, append(extra, "app", d.app, "addr", d.myAddr)...)
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}
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// SetLogger 设置 Discover 使用的全局 Logger
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func (d *Discoverer) SetLogger(logger *log.Logger) {
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d.logger = logger
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}
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// New 创建一个新的发现服务实例
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func New(logger *log.Logger, confs ...Config) *Discoverer {
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var conf Config
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if len(confs) > 0 {
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conf = confs[0]
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}
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if conf.CallRetryTimes <= 0 {
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conf.CallRetryTimes = 10
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}
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if conf.Weight <= 0 {
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conf.Weight = 100
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}
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if logger == nil {
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logger = log.DefaultLogger
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}
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d := &Discoverer{
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config: conf,
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calls: make(map[string]CallConfig),
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appNodes: make(map[string]map[string]*NodeInfo),
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appSubscribed: make(map[string]bool),
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appClientPools: make(map[string]*gohttp.Client),
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settedLoadBalancer: &DefaultLoadBalancer{},
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daemonStopSignal: make(chan struct{}),
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daemonDoneSignal: make(chan struct{}),
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logger: logger,
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}
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return d
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}
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// Start 启动服务发现，指定当前节点的外部访问地址
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func Start(registry, app, addr string, logger *log.Logger, confs ...Config) *Discoverer {
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d := New(logger, confs...)
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d.registry = registry
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d.app = app
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d.myAddr = addr
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d.isServer = d.app != "" && d.config.Weight > 0
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if d.isServer && d.registry != "" {
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d.serverRedisPool = redis.GetRedis(d.registry, d.logger)
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if d.serverRedisPool.Error != nil {
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d.logError(d.serverRedisPool.Error.Error())
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}
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// 注册节点
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if d.serverRedisPool.Do("HSET", d.app, addr, d.config.Weight).Error == nil {
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d.serverRedisPool.Do("SETEX", d.app+"_"+addr, 10, "1")
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d.logInfo("registered")
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d.serverRedisPool.PUBLISH("CH_"+d.app, fmt.Sprintf("%s %d", addr, d.config.Weight))
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d.daemonRunning.Store(true)
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d.daemonStopSignal = make(chan struct{})
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d.daemonDoneSignal = make(chan struct{})
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go d.daemon()
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} else {
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d.logError("register failed")
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}
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}
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calls := d.config.Calls
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if len(calls) > 0 {
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for callApp, c := range calls {
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d.addApp(callApp, c, false)
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}
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if !d.startSub() {
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return d
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}
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}
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return d
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}
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// Open 启动服务发现仅作为客户端
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func Open(registry string, logger *log.Logger, confs ...Config) *Discoverer {
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d := New(logger, confs...)
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d.registry = registry
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calls := d.config.Calls
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if len(calls) > 0 {
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for callApp, c := range calls {
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d.addApp(callApp, c, false)
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}
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}
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d.startSub()
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return d
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}
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func (d *Discoverer) daemon() {
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d.logInfo("daemon thread started")
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ticker := time.NewTicker(5 * time.Second)
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defer ticker.Stop()
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for d.daemonRunning.Load() {
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select {
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case <-ticker.C:
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if !d.daemonRunning.Load() {
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break
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}
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if d.isServer && d.serverRedisPool != nil {
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if !d.serverRedisPool.Do("HEXISTS", d.app, d.myAddr).Bool() {
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d.logInfo("lost app registered info, re-registering")
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if d.serverRedisPool.Do("HSET", d.app, d.myAddr, d.config.Weight).Error == nil {
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d.serverRedisPool.Do("SETEX", d.app+"_"+d.myAddr, 10, "1")
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d.serverRedisPool.PUBLISH("CH_"+d.app, fmt.Sprintf("%s %d", d.myAddr, d.config.Weight))
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}
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} else {
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d.serverRedisPool.Do("SETEX", d.app+"_"+d.myAddr, 10, "1")
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}
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}
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case <-d.daemonStopSignal:
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goto done
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}
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}
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done:
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d.logInfo("daemon thread stopped")
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close(d.daemonDoneSignal)
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}
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func (d *Discoverer) startSub() bool {
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if d.registry == "" {
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return true
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}
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d.appLock.Lock()
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if d.clientRedisPool == nil {
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d.clientRedisPool = redis.GetRedis(d.registry, d.logger)
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}
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if d.pubsubRedisPool == nil {
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d.pubsubRedisPool = redis.GetRedis(d.registry, d.logger.New(id.MakeID(12)))
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// 订阅所有已注册的应用
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for app := range d.appSubscribed {
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d.subscribeApp(app)
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}
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// 必须在释放锁之前完成配置，但在释放锁之后启动，避免死锁
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d.appLock.Unlock()
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d.pubsubRedisPool.Start()
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d.appLock.Lock()
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}
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d.isClient = true
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d.appLock.Unlock()
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return true
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}
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func (d *Discoverer) subscribeApp(app string) {
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if d.pubsubRedisPool == nil {
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d.appSubscribed[app] = true
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return
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}
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d.pubsubRedisPool.Subscribe("CH_"+app, func() {
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d.fetchApp(app)
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}, func(data []byte) {
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a := strings.Split(string(data), " ")
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addr := a[0]
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weight := 0
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if len(a) == 2 {
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weight = cast.Int(a[1])
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}
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d.logInfo("received node update", "app", app, "addr", addr, "weight", weight)
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d.pushNode(app, addr, weight)
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})
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}
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func (d *Discoverer) subscribeAppWithLock(app string) {
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d.appLock.Lock()
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defer d.appLock.Unlock()
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d.subscribeApp(app)
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}
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// Stop 停止 Discover 并从注册中心注销当前节点
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func (d *Discoverer) Stop() {
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d.appLock.Lock()
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// 1. 提取需要的状态，提前修改标志位
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isClient := d.isClient
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pubsub := d.pubsubRedisPool
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d.isClient = false
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isServer := d.isServer
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serverPool := d.serverRedisPool
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myAddr := d.myAddr
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if isServer {
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d.daemonRunning.Store(false)
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if d.daemonStopSignal != nil {
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close(d.daemonStopSignal)
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}
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d.isServer = false
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}
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// 核心修复：在这里尽早释放锁！避免与 pushNode 回调发生死锁
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d.appLock.Unlock()
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// 2. 在无锁状态下进行耗时的网络和停止操作
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if isClient && pubsub != nil {
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pubsub.Stop()
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}
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if isServer && serverPool != nil {
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serverPool.Do("HDEL", d.app, myAddr)
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serverPool.Do("DEL", d.app+"_"+myAddr)
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serverPool.PUBLISH("CH_"+d.app, fmt.Sprintf("%s %d", myAddr, 0))
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}
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// 3. 释放 HTTP 连接池
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d.appClientPoolsLock.Lock()
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for _, client := range d.appClientPools {
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client.Destroy()
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}
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d.appClientPools = make(map[string]*gohttp.Client)
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d.appClientPoolsLock.Unlock()
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// 4. 重置状态以支持重新启动
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d.appLock.Lock()
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d.serverRedisPool = nil
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d.clientRedisPool = nil
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d.pubsubRedisPool = nil
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d.appNodes = make(map[string]map[string]*NodeInfo)
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d.appSubscribed = make(map[string]bool)
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d.appLock.Unlock()
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}
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// Wait 等待守护进程退出
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func (d *Discoverer) Wait() {
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if d.daemonDoneSignal != nil {
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<-d.daemonDoneSignal
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}
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}
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// AddExternalApp 动态添加需要发现的外部应用
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func (d *Discoverer) AddExternalApp(app string, callConf CallConfig) bool {
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if d.addApp(app, callConf, true) {
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if !d.isClient {
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d.startSub()
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} else {
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d.subscribeAppWithLock(app)
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}
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d.fetchApp(app) // 同步拉取一次
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return true
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}
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return false
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}
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func (d *Discoverer) getCallInfo(app string) (CallConfig, bool) {
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d.appLock.RLock()
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defer d.appLock.RUnlock()
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info, exists := d.calls[app]
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return info, exists
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}
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func (d *Discoverer) addApp(app string, callConf CallConfig, fetch bool) bool {
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d.appLock.Lock()
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// 1. 写时复制（Copy-on-Write）：创建一个全新的 Map 避免影响读操作
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newCalls := make(map[string]CallConfig)
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for k, v := range d.config.Calls {
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newCalls[k] = v
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}
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if existing, ok := newCalls[app]; ok {
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// compare? simple enough to just overwrite if we want to be safe, but let's check basic equality or just overwrite
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_ = existing
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}
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if d.appNodes[app] != nil {
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// If nodes exist, we might just be updating config
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}
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newCalls[app] = callConf
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d.config.Calls = newCalls // 将新的 Map 赋值给 Config
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d.calls[app] = callConf
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if d.appNodes[app] == nil {
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d.appNodes[app] = make(map[string]*NodeInfo)
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}
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d.appSubscribed[app] = true
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d.appLock.Unlock()
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if fetch && d.isClient {
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d.fetchApp(app)
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}
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return true
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}
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func (d *Discoverer) fetchApp(app string) {
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d.appLock.RLock()
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pool := d.clientRedisPool
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d.appLock.RUnlock()
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if pool == nil {
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return
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}
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results := pool.Do("HGETALL", app).ResultMap()
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// 检查存活
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for addr := range results {
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if !pool.Do("EXISTS", app+"_"+addr).Bool() {
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pool.Do("HDEL", app, addr)
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delete(results, addr)
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}
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}
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currentNodes := d.getAppNodes(app)
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if currentNodes != nil {
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for addr := range currentNodes {
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if _, ok := results[addr]; !ok {
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d.pushNode(app, addr, 0)
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}
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}
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}
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for addr, res := range results {
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d.pushNode(app, addr, res.Int())
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}
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}
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func (d *Discoverer) getAppNodes(app string) map[string]*NodeInfo {
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d.appLock.RLock()
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defer d.appLock.RUnlock()
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if d.appNodes[app] == nil {
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return nil
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}
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nodes := make(map[string]*NodeInfo)
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for k, v := range d.appNodes[app] {
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nodes[k] = v
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}
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return nodes
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}
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// SetNode 手动设置某个服务的节点信息
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func (d *Discoverer) SetNode(app, addr string, weight int) {
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d.pushNode(app, addr, weight)
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}
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// GetAppNodes 获取某个应用的所有节点列表
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func (d *Discoverer) GetAppNodes(app string) map[string]*NodeInfo {
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return d.getAppNodes(app)
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}
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func (d *Discoverer) pushNode(app, addr string, weight int) {
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d.appLock.Lock()
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defer d.appLock.Unlock()
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if weight <= 0 {
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if d.appNodes[app] != nil {
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delete(d.appNodes[app], addr)
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}
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return
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}
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if d.appNodes[app] == nil {
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d.appNodes[app] = make(map[string]*NodeInfo)
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}
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if node, ok := d.appNodes[app][addr]; ok {
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if node.Weight != weight {
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used := node.UsedTimes.Load()
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node.UsedTimes.Store(uint64(float64(used) / float64(node.Weight) * float64(weight)))
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node.Weight = weight
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}
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} else {
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var avgUsed uint64 = 0
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if len(d.appNodes[app]) > 0 {
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var totalScore float64
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for _, n := range d.appNodes[app] {
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totalScore += float64(n.UsedTimes.Load()) / float64(n.Weight)
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}
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avgUsed = uint64(totalScore / float64(len(d.appNodes[app])) * float64(weight))
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}
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node := &NodeInfo{
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Addr: addr,
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Weight: weight,
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}
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node.UsedTimes.Store(avgUsed)
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d.appNodes[app][addr] = node
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}
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}
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