Merge pull request #391 from guobingithub/feature-zk-loadBalance
zookeeper接入kratos 服务注册发现与负载均衡pull/412/head
Tony
5 years ago
committed by
GitHub
commit
3a16ed706b
@ -0,0 +1,372 @@ |
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package zookeeper |
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import ( |
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"context" |
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"encoding/json" |
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"errors" |
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"fmt" |
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"sync" |
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"sync/atomic" |
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"time" |
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"github.com/bilibili/kratos/pkg/log" |
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"github.com/bilibili/kratos/pkg/naming" |
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"github.com/go-zookeeper/zk" |
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) |
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type Config struct { |
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// Endpoints is a list of URLs.
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Endpoints []string `json:"endpoints"` |
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} |
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var ( |
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_once sync.Once |
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_builder naming.Builder |
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//ErrDuplication is a register duplication err
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ErrDuplication = errors.New("zookeeper: instance duplicate registration") |
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) |
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// Builder return default zookeeper resolver builder.
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func Builder(c *Config) naming.Builder { |
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_once.Do(func() { |
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_builder, _ = New(c) |
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}) |
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return _builder |
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} |
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// Build register resolver into default zookeeper.
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func Build(c *Config, id string) naming.Resolver { |
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return Builder(c).Build(id) |
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} |
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// ZookeeperBuilder is a zookeeper client Builder
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type ZookeeperBuilder struct { |
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cli *zk.Conn |
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connEvent <-chan zk.Event |
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ctx context.Context |
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cancelFunc context.CancelFunc |
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mutex sync.RWMutex |
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apps map[string]*appInfo |
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registry map[string]struct{} |
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} |
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type appInfo struct { |
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resolver map[*Resolve]struct{} |
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ins atomic.Value |
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zkb *ZookeeperBuilder |
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once sync.Once |
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} |
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// Resolve zookeeper resolver.
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type Resolve struct { |
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id string |
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event chan struct{} |
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zkb *ZookeeperBuilder |
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} |
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// New is new a zookeeper builder
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func New(c *Config) (zkb *ZookeeperBuilder, err error) { |
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//example: endpointSli = []string{"192.168.1.78:2181", "192.168.1.79:2181", "192.168.1.80:2181"}
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if len(c.Endpoints) == 0 { |
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errInfo := fmt.Sprintf("zookeeper New failed, endpoints is null") |
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log.Error(errInfo) |
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return nil, errors.New(errInfo) |
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} |
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zkConn, connEvent, err := zk.Connect(c.Endpoints, 5*time.Second) |
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if err != nil { |
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log.Error(fmt.Sprintf("zk Connect err:(%v)", err)) |
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return |
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} else { |
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log.Info(fmt.Sprintf("zk Connect ok!")) |
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} |
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ctx, cancel := context.WithCancel(context.Background()) |
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zkb = &ZookeeperBuilder{ |
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cli: zkConn, |
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connEvent: connEvent, |
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ctx: ctx, |
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cancelFunc: cancel, |
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apps: map[string]*appInfo{}, |
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registry: map[string]struct{}{}, |
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} |
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return |
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} |
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// Build zookeeper resovler builder.
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func (z *ZookeeperBuilder) Build(appid string) naming.Resolver { |
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r := &Resolve{ |
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id: appid, |
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zkb: z, |
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event: make(chan struct{}, 1), |
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} |
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z.mutex.Lock() |
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app, ok := z.apps[appid] |
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if !ok { |
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app = &appInfo{ |
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resolver: make(map[*Resolve]struct{}), |
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zkb: z, |
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} |
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z.apps[appid] = app |
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} |
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app.resolver[r] = struct{}{} |
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z.mutex.Unlock() |
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if ok { |
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select { |
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case r.event <- struct{}{}: |
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default: |
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} |
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} |
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app.once.Do(func() { |
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go app.watch(appid) |
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log.Info("zookeeper: AddWatch(%s) already watch(%v)", appid, ok) |
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}) |
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return r |
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} |
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// Scheme return zookeeper's scheme
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func (z *ZookeeperBuilder) Scheme() string { |
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return "zookeeper" |
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} |
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// Register is register instance
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func (z *ZookeeperBuilder) Register(ctx context.Context, ins *naming.Instance) (cancelFunc context.CancelFunc, err error) { |
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z.mutex.Lock() |
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if _, ok := z.registry[ins.AppID]; ok { |
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err = ErrDuplication |
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} else { |
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z.registry[ins.AppID] = struct{}{} |
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} |
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z.mutex.Unlock() |
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if err != nil { |
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return |
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} |
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ctx, cancel := context.WithCancel(z.ctx) |
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if err = z.register(ctx, ins); err != nil { |
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z.mutex.Lock() |
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delete(z.registry, ins.AppID) |
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z.mutex.Unlock() |
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cancel() |
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return |
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} |
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ch := make(chan struct{}, 1) |
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cancelFunc = context.CancelFunc(func() { |
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cancel() |
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<-ch |
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}) |
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go func() { |
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for { |
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select { |
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case connEvent := <-z.connEvent: |
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log.Warn("watch zkClient state, connEvent:(%v)", connEvent) |
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if connEvent.State == zk.StateHasSession { |
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log.Warn("watch zkClient state, state is StateHasSession...") |
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err = z.register(ctx, ins) |
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if err != nil { |
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log.Warn(fmt.Sprintf("watch zkClient state, fail to register node error:(%v)", err)) |
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continue |
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} |
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} |
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case <-ctx.Done(): |
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ch <- struct{}{} |
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return |
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} |
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} |
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}() |
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return |
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} |
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func (z *ZookeeperBuilder) registerPerServer(name string) (err error) { |
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var ( |
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str string |
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) |
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str, err = z.cli.Create(name, nil, 0, zk.WorldACL(zk.PermAll)) |
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if err != nil { |
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log.Warn(fmt.Sprintf("registerPerServer, fail to Create node:(%s). err:(%v)", name, err)) |
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} else { |
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log.Info(fmt.Sprintf("registerPerServer, succeed to Create node:(%s). retStr:(%s)", name, str)) |
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} |
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return |
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} |
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func (z *ZookeeperBuilder) registerEphServer(name, host string, ins *naming.Instance) (err error) { |
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var ( |
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str string |
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) |
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val, _ := json.Marshal(ins) |
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log.Info(fmt.Sprintf("registerEphServer, ins after json.Marshal:(%v)", string(val))) |
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str, err = z.cli.Create(name+host, val, zk.FlagEphemeral, zk.WorldACL(zk.PermAll)) |
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if err != nil { |
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log.Warn(fmt.Sprintf("registerEphServer, fail to Create node:%s. err:(%v)", name+host, err)) |
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} else { |
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log.Info(fmt.Sprintf("registerEphServer, succeed to Create node:%s. retStr:(%s)", name+host, str)) |
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} |
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return |
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} |
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// register 注册zookeeper节点
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func (z *ZookeeperBuilder) register(ctx context.Context, ins *naming.Instance) (err error) { |
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log.Info("zookeeper register enter, instance Addrs:(%v)", ins.Addrs) |
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prefix := z.keyPrefix(ins) |
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err = z.registerPerServer(prefix) |
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if err != nil { |
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log.Warn(fmt.Sprintf("register, fail to registerPerServer node error:(%v)", err)) |
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} |
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for _, val := range ins.Addrs { |
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err = z.registerEphServer(prefix, "/"+val, ins) |
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if err != nil { |
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log.Warn(fmt.Sprintf("registerServer, fail to RegisterEphServer node error:(%v)", err)) |
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} else { |
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log.Info(fmt.Sprintf("registerServer, succeed to RegistServer node.")) |
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} |
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} |
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return nil |
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} |
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// unregister 删除zookeeper中节点信息
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func (z *ZookeeperBuilder) unregister(ins *naming.Instance) (err error) { |
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log.Info("zookeeper unregister enter, instance Addrs:(%v)", ins.Addrs) |
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prefix := z.keyPrefix(ins) |
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for _, val := range ins.Addrs { |
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strNode := prefix + "/" + val |
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exists, _, err := z.cli.Exists(strNode) |
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if err != nil { |
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log.Error("zk.Conn.Exists node:(%v), error:(%s)", strNode, err.Error()) |
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return err |
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} |
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if exists { |
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_, s, err := z.cli.Get(strNode) |
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if err != nil { |
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log.Error("zk.Conn.Get node:(%s), error:(%s)", strNode, err.Error()) |
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return err |
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} |
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return z.cli.Delete(strNode, s.Version) |
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} |
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log.Info(fmt.Sprintf("unregister, client.Delete:(%v), appid:(%v), hostname:(%v) success", strNode, ins.AppID, ins.Hostname)) |
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} |
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return |
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} |
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func (z *ZookeeperBuilder) keyPrefix(ins *naming.Instance) string { |
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return fmt.Sprintf("/%s", ins.AppID) |
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} |
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// Close stop all running process including zk fetch and register
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func (z *ZookeeperBuilder) Close() error { |
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z.cancelFunc() |
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return nil |
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} |
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func (a *appInfo) watch(appID string) { |
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_ = a.fetchstore(appID) |
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prefix := fmt.Sprintf("/%s", appID) |
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go func() { |
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for { |
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log.Info(fmt.Sprintf("zk ChildrenW enter, prefix:(%v)", prefix)) |
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snapshot, _, event, err := a.zkb.cli.ChildrenW(prefix) |
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if err != nil { |
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continue |
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} |
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log.Info(fmt.Sprintf("zk ChildrenW ok, snapshot:(%v)", snapshot)) |
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for ev := range event { |
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log.Info(fmt.Sprintf("zk ChildrenW ok, prefix:(%v), event Path:(%v), Type:(%v)", prefix, ev.Path, ev.Type)) |
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if ev.Type == zk.EventNodeChildrenChanged { |
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_ = a.fetchstore(appID) |
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} |
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} |
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} |
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}() |
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} |
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func (a *appInfo) fetchstore(appID string) (err error) { |
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prefix := fmt.Sprintf("/%s", appID) |
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strNode := "" |
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childs, _, err := a.zkb.cli.Children(prefix) |
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if err != nil { |
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log.Error(fmt.Sprintf("fetchstore, fail to get Children of node:(%v), err:(%v)", prefix, err)) |
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} else { |
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log.Info(fmt.Sprintf("fetchstore, ok to get Children of node:(%v), childs:(%v)", prefix, childs)) |
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} |
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ins := &naming.InstancesInfo{ |
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Instances: make(map[string][]*naming.Instance, 0), |
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} |
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//for range childs
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for _, child := range childs { |
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strNode = prefix + "/" + child |
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resp, _, err := a.zkb.cli.Get(strNode) |
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if err != nil { |
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log.Error("zookeeper: fetch client.Get(%s) error(%v)", strNode, err) |
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return err |
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} |
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in := new(naming.Instance) |
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err = json.Unmarshal(resp, in) |
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if err != nil { |
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return err |
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} |
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ins.Instances[in.Zone] = append(ins.Instances[in.Zone], in) |
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} |
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a.store(ins) |
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return nil |
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} |
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func (a *appInfo) store(ins *naming.InstancesInfo) { |
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a.ins.Store(ins) |
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a.zkb.mutex.RLock() |
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for rs := range a.resolver { |
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select { |
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case rs.event <- struct{}{}: |
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default: |
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} |
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} |
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a.zkb.mutex.RUnlock() |
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} |
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// Watch watch instance.
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func (r *Resolve) Watch() <-chan struct{} { |
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return r.event |
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} |
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// Fetch fetch resolver instance.
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func (r *Resolve) Fetch(ctx context.Context) (ins *naming.InstancesInfo, ok bool) { |
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r.zkb.mutex.RLock() |
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app, ok := r.zkb.apps[r.id] |
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r.zkb.mutex.RUnlock() |
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if ok { |
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ins, ok = app.ins.Load().(*naming.InstancesInfo) |
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return |
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} |
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return |
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} |
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// Close close resolver.
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func (r *Resolve) Close() error { |
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r.zkb.mutex.Lock() |
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if app, ok := r.zkb.apps[r.id]; ok && len(app.resolver) != 0 { |
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delete(app.resolver, r) |
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} |
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r.zkb.mutex.Unlock() |
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return nil |
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} |
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