110 lines
2.1 KiB
Go
110 lines
2.1 KiB
Go
package registry
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import (
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"github.com/hashicorp/consul/api"
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"github.com/hashicorp/consul/watch"
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)
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type consulWatcher struct {
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Registry *consulRegistry
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wp *watch.WatchPlan
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watchers map[string]*watch.WatchPlan
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}
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type serviceWatcher struct {
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name string
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}
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func newConsulWatcher(cr *consulRegistry) (Watcher, error) {
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cw := &consulWatcher{
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Registry: cr,
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watchers: make(map[string]*watch.WatchPlan),
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}
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wp, err := watch.Parse(map[string]interface{}{"type": "services"})
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if err != nil {
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return nil, err
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}
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wp.Handler = cw.Handle
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go wp.Run(cr.Address)
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cw.wp = wp
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return cw, nil
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}
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func (cw *consulWatcher) serviceHandler(idx uint64, data interface{}) {
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entries, ok := data.([]*api.ServiceEntry)
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if !ok {
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return
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}
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cs := &Service{}
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for _, e := range entries {
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cs.Endpoints = decodeEndpoints(e.Service.Tags)
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cs.Name = e.Service.Service
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cs.Nodes = append(cs.Nodes, &Node{
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Id: e.Service.ID,
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Address: e.Node.Address,
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Port: e.Service.Port,
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Metadata: decodeMetadata(e.Service.Tags),
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})
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}
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cw.Registry.mtx.Lock()
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cw.Registry.services[cs.Name] = cs
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cw.Registry.mtx.Unlock()
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}
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func (cw *consulWatcher) Handle(idx uint64, data interface{}) {
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services, ok := data.(map[string][]string)
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if !ok {
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return
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}
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// add new watchers
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for service, _ := range services {
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if _, ok := cw.watchers[service]; ok {
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continue
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}
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wp, err := watch.Parse(map[string]interface{}{
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"type": "service",
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"service": service,
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})
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if err == nil {
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wp.Handler = cw.serviceHandler
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go wp.Run(cw.Registry.Address)
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cw.watchers[service] = wp
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}
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}
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cw.Registry.mtx.RLock()
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rservices := cw.Registry.services
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cw.Registry.mtx.RUnlock()
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// remove unknown services from registry
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for service, _ := range rservices {
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if _, ok := services[service]; !ok {
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cw.Registry.mtx.Lock()
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delete(cw.Registry.services, service)
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cw.Registry.mtx.Unlock()
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}
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}
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// remove unknown services from watchers
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for service, w := range cw.watchers {
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if _, ok := services[service]; !ok {
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w.Stop()
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delete(cw.watchers, service)
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}
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}
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}
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func (cw *consulWatcher) Stop() {
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if cw.wp == nil {
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return
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}
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cw.wp.Stop()
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}
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