88 lines
2.1 KiB
Go
88 lines
2.1 KiB
Go
// Copyright 2020 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package watcher
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import (
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"time"
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"github.com/fsnotify/fsnotify"
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"github.com/gohugoio/hugo/watcher/filenotify"
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)
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// Batcher batches file watch events in a given interval.
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type Batcher struct {
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filenotify.FileWatcher
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interval time.Duration
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done chan struct{}
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Events chan []fsnotify.Event // Events are returned on this channel
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}
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// New creates and starts a Batcher with the given time interval.
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// It will fall back to a poll based watcher if native isn's supported.
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// To always use polling, set poll to true.
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func New(intervalBatcher, intervalPoll time.Duration, poll bool) (*Batcher, error) {
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var err error
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var watcher filenotify.FileWatcher
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if poll {
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watcher = filenotify.NewPollingWatcher(intervalPoll)
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} else {
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watcher, err = filenotify.New(intervalPoll)
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}
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if err != nil {
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return nil, err
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}
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batcher := &Batcher{}
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batcher.FileWatcher = watcher
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batcher.interval = intervalBatcher
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batcher.done = make(chan struct{}, 1)
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batcher.Events = make(chan []fsnotify.Event, 1)
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if err == nil {
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go batcher.run()
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}
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return batcher, nil
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}
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func (b *Batcher) run() {
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tick := time.Tick(b.interval)
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evs := make([]fsnotify.Event, 0)
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OuterLoop:
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for {
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select {
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case ev := <-b.FileWatcher.Events():
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evs = append(evs, ev)
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case <-tick:
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if len(evs) == 0 {
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continue
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}
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b.Events <- evs
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evs = make([]fsnotify.Event, 0)
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case <-b.done:
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break OuterLoop
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}
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}
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close(b.done)
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}
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// Close stops the watching of the files.
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func (b *Batcher) Close() {
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b.done <- struct{}{}
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b.FileWatcher.Close()
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}
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