152 lines
2.6 KiB
Go
152 lines
2.6 KiB
Go
package etcd
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import (
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etcd "github.com/coreos/etcd/client"
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"github.com/myodc/go-micro/registry"
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"golang.org/x/net/context"
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)
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type etcdWatcher struct {
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registry *etcdRegistry
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stop chan bool
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}
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func addNodes(old, neu []*registry.Node) []*registry.Node {
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for _, n := range neu {
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var seen bool
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for i, o := range old {
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if o.Id == n.Id {
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seen = true
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old[i] = n
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break
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}
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}
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if !seen {
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old = append(old, n)
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}
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}
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return old
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}
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func addServices(old, neu []*registry.Service) []*registry.Service {
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for _, s := range neu {
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var seen bool
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for i, o := range old {
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if o.Version == s.Version {
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s.Nodes = addNodes(o.Nodes, s.Nodes)
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seen = true
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old[i] = s
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break
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}
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}
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if !seen {
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old = append(old, s)
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}
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}
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return old
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}
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func delNodes(old, del []*registry.Node) []*registry.Node {
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var nodes []*registry.Node
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for _, o := range old {
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var rem bool
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for _, n := range del {
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if o.Id == n.Id {
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rem = true
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break
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}
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}
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if !rem {
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nodes = append(nodes, o)
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}
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}
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return nodes
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}
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func delServices(old, del []*registry.Service) []*registry.Service {
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var services []*registry.Service
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for i, o := range old {
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var rem bool
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for _, s := range del {
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if o.Version == s.Version {
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old[i].Nodes = delNodes(o.Nodes, s.Nodes)
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if len(old[i].Nodes) == 0 {
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rem = true
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}
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}
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}
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if !rem {
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services = append(services, o)
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}
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}
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return services
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}
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func newEtcdWatcher(r *etcdRegistry) (registry.Watcher, error) {
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ew := &etcdWatcher{
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registry: r,
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stop: make(chan bool),
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}
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w := r.client.Watcher(prefix, &etcd.WatcherOptions{AfterIndex: 0, Recursive: true})
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c := context.Background()
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ctx, cancel := context.WithCancel(c)
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go func() {
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<-ew.stop
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cancel()
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}()
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go ew.watch(ctx, w)
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return ew, nil
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}
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func (e *etcdWatcher) watch(ctx context.Context, w etcd.Watcher) {
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for {
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rsp, err := w.Next(ctx)
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if err != nil && ctx.Err() != nil {
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return
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}
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if rsp.Node.Dir {
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continue
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}
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s := decode(rsp.Node.Value)
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if s == nil {
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continue
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}
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e.registry.Lock()
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service, ok := e.registry.services[s.Name]
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if !ok {
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if rsp.Action == "create" {
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e.registry.services[s.Name] = []*registry.Service{s}
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}
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e.registry.Unlock()
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continue
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}
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switch rsp.Action {
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case "delete":
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services := delServices(service, []*registry.Service{s})
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if len(services) > 0 {
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e.registry.services[s.Name] = services
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} else {
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delete(e.registry.services, s.Name)
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}
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case "create":
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e.registry.services[s.Name] = addServices(service, []*registry.Service{s})
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}
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e.registry.Unlock()
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}
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}
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func (ew *etcdWatcher) Stop() {
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ew.stop <- true
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}
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