116 lines
1.9 KiB
Go
116 lines
1.9 KiB
Go
package service
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import (
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"io"
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"sync"
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"time"
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"github.com/micro/go-micro/router"
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pb "github.com/micro/go-micro/router/proto"
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)
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type watcher struct {
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sync.RWMutex
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opts router.WatchOptions
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resChan chan *router.Event
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done chan struct{}
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}
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func newWatcher(rsp pb.Router_WatchService, opts router.WatchOptions) (*watcher, error) {
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w := &watcher{
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opts: opts,
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resChan: make(chan *router.Event),
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done: make(chan struct{}),
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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 <-w.done:
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return
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default:
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if err := w.watch(rsp); err != nil {
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w.Stop()
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return
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}
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}
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}
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}()
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return w, nil
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}
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// watchRouter watches router and send events to all registered watchers
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func (w *watcher) watch(stream pb.Router_WatchService) error {
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defer stream.Close()
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var watchErr error
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for {
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resp, err := stream.Recv()
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if err != nil {
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if err != io.EOF {
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watchErr = err
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}
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break
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}
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route := router.Route{
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Service: resp.Route.Service,
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Address: resp.Route.Address,
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Gateway: resp.Route.Gateway,
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Network: resp.Route.Network,
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Link: resp.Route.Link,
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Metric: int(resp.Route.Metric),
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}
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event := &router.Event{
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Type: router.EventType(resp.Type),
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Timestamp: time.Unix(0, resp.Timestamp),
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Route: route,
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}
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select {
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case w.resChan <- event:
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case <-w.done:
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}
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}
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return watchErr
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}
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// Next is a blocking call that returns watch result
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func (w *watcher) Next() (*router.Event, error) {
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for {
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select {
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case res := <-w.resChan:
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switch w.opts.Service {
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case res.Route.Service, "*":
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return res, nil
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default:
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continue
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}
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case <-w.done:
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return nil, router.ErrWatcherStopped
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}
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}
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}
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// Chan returns event channel
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func (w *watcher) Chan() (<-chan *router.Event, error) {
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return w.resChan, nil
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}
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// Stop stops watcher
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func (w *watcher) Stop() {
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w.Lock()
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defer w.Unlock()
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select {
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case <-w.done:
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return
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default:
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close(w.done)
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}
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}
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