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watch.go
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watch.go
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// Copyright (c) 2014 Couchbase, Inc.
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
// except in compliance with the License. You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software distributed under the
// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
// either express or implied. See the License for the specific language governing permissions
// and limitations under the License.
package indexer
import (
"log"
"time"
"github.com/blevesearch/bleve"
"gopkg.in/fsnotify.v1"
git "gopkg.in/src-d/go-git.v4"
)
func startWatching(path string, index bleve.Index, repo *git.Repository) *fsnotify.Watcher {
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.Fatal(err)
}
// start a go routine to process events
go func() {
idleTimer := time.NewTimer(10 * time.Second)
queuedEvents := make([]fsnotify.Event, 0)
for {
select {
case ev := <-watcher.Events:
queuedEvents = append(queuedEvents, ev)
idleTimer.Reset(10 * time.Second)
case err := <-watcher.Errors:
log.Fatal(err)
case <-idleTimer.C:
for _, ev := range queuedEvents {
if pathMatch(ev.Name) {
switch ev.Op {
case fsnotify.Remove, fsnotify.Rename:
// delete the path
processDelete(index, repo, ev.Name)
case fsnotify.Create, fsnotify.Write:
// update the path
processUpdate(index, repo, ev.Name)
default:
// ignore
}
}
}
queuedEvents = make([]fsnotify.Event, 0)
idleTimer.Reset(10 * time.Second)
}
}
}()
// now actually watch the path requested
err = watcher.Add(path)
if err != nil {
log.Fatal(err)
}
log.Printf("watching '%s' for changes...", path)
return watcher
}