mirror of
https://github.com/docker/compose.git
synced 2025-04-08 17:05:13 +02:00
74 lines
1.9 KiB
Go
74 lines
1.9 KiB
Go
/*
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Copyright 2020 Docker Compose CLI authors
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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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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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*/
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package watch
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import (
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"context"
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"time"
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"github.com/docker/compose/v2/pkg/utils"
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"github.com/jonboulle/clockwork"
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"github.com/sirupsen/logrus"
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)
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const QuietPeriod = 500 * time.Millisecond
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// batchDebounceEvents groups identical file events within a sliding time window and writes the results to the returned
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// channel.
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//
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// The returned channel is closed when the debouncer is stopped via context cancellation or by closing the input channel.
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func BatchDebounceEvents(ctx context.Context, clock clockwork.Clock, input <-chan FileEvent) <-chan []FileEvent {
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out := make(chan []FileEvent)
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go func() {
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defer close(out)
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seen := utils.Set[FileEvent]{}
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flushEvents := func() {
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if len(seen) == 0 {
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return
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}
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logrus.Debugf("flush: %d events %s", len(seen), seen)
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events := make([]FileEvent, 0, len(seen))
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for e := range seen {
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events = append(events, e)
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}
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out <- events
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seen = utils.Set[FileEvent]{}
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}
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t := clock.NewTicker(QuietPeriod)
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defer t.Stop()
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for {
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select {
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case <-ctx.Done():
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return
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case <-t.Chan():
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flushEvents()
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case e, ok := <-input:
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if !ok {
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// input channel was closed
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flushEvents()
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return
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}
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if _, ok := seen[e]; !ok {
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seen.Add(e)
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}
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t.Reset(QuietPeriod)
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}
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}
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}()
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return out
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}
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