mirror of https://github.com/docker/compose.git
145 lines
3.3 KiB
Go
145 lines
3.3 KiB
Go
/*
|
|
Copyright 2020 Docker Compose CLI authors
|
|
|
|
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 watch
|
|
|
|
import (
|
|
"errors"
|
|
"expvar"
|
|
"fmt"
|
|
"os"
|
|
"path/filepath"
|
|
"runtime"
|
|
"strconv"
|
|
|
|
"github.com/tilt-dev/fsnotify"
|
|
)
|
|
|
|
var (
|
|
numberOfWatches = expvar.NewInt("watch.naive.numberOfWatches")
|
|
)
|
|
|
|
type FileEvent struct {
|
|
path string
|
|
}
|
|
|
|
func NewFileEvent(p string) FileEvent {
|
|
if !filepath.IsAbs(p) {
|
|
panic(fmt.Sprintf("NewFileEvent only accepts absolute paths. Actual: %s", p))
|
|
}
|
|
return FileEvent{path: p}
|
|
}
|
|
|
|
func (e FileEvent) Path() string {
|
|
return e.path
|
|
}
|
|
|
|
type Notify interface {
|
|
// Start watching the paths set at init time
|
|
Start() error
|
|
|
|
// Stop watching and close all channels
|
|
Close() error
|
|
|
|
// A channel to read off incoming file changes
|
|
Events() chan FileEvent
|
|
|
|
// A channel to read off show-stopping errors
|
|
Errors() chan error
|
|
}
|
|
|
|
// When we specify directories to watch, we often want to
|
|
// ignore some subset of the files under those directories.
|
|
//
|
|
// For example:
|
|
// - Watch /src/repo, but ignore /src/repo/.git
|
|
// - Watch /src/repo, but ignore everything in /src/repo/bazel-bin except /src/repo/bazel-bin/app-binary
|
|
//
|
|
// The PathMatcher interface helps us manage these ignores.
|
|
type PathMatcher interface {
|
|
Matches(file string) (bool, error)
|
|
|
|
// If this matches the entire dir, we can often optimize filetree walks a bit.
|
|
MatchesEntireDir(file string) (bool, error)
|
|
}
|
|
|
|
type EmptyMatcher struct {
|
|
}
|
|
|
|
func (EmptyMatcher) Matches(f string) (bool, error) { return false, nil }
|
|
func (EmptyMatcher) MatchesEntireDir(f string) (bool, error) { return false, nil }
|
|
|
|
var _ PathMatcher = EmptyMatcher{}
|
|
|
|
func NewWatcher(paths []string, ignore PathMatcher) (Notify, error) {
|
|
return newWatcher(paths, ignore)
|
|
}
|
|
|
|
const WindowsBufferSizeEnvVar = "COMPOSE_WATCH_WINDOWS_BUFFER_SIZE"
|
|
|
|
const defaultBufferSize int = 65536
|
|
|
|
func DesiredWindowsBufferSize() int {
|
|
envVar := os.Getenv(WindowsBufferSizeEnvVar)
|
|
if envVar != "" {
|
|
size, err := strconv.Atoi(envVar)
|
|
if err == nil {
|
|
return size
|
|
}
|
|
}
|
|
return defaultBufferSize
|
|
}
|
|
|
|
func IsWindowsShortReadError(err error) bool {
|
|
return runtime.GOOS == "windows" && !errors.Is(err, fsnotify.ErrEventOverflow)
|
|
}
|
|
|
|
type CompositePathMatcher struct {
|
|
Matchers []PathMatcher
|
|
}
|
|
|
|
func NewCompositeMatcher(matchers ...PathMatcher) PathMatcher {
|
|
if len(matchers) == 0 {
|
|
return EmptyMatcher{}
|
|
}
|
|
return CompositePathMatcher{Matchers: matchers}
|
|
}
|
|
|
|
func (c CompositePathMatcher) Matches(f string) (bool, error) {
|
|
for _, t := range c.Matchers {
|
|
ret, err := t.Matches(f)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
if ret {
|
|
return true, nil
|
|
}
|
|
}
|
|
return false, nil
|
|
}
|
|
|
|
func (c CompositePathMatcher) MatchesEntireDir(f string) (bool, error) {
|
|
for _, t := range c.Matchers {
|
|
matches, err := t.MatchesEntireDir(f)
|
|
if matches || err != nil {
|
|
return matches, err
|
|
}
|
|
}
|
|
return false, nil
|
|
}
|
|
|
|
var _ PathMatcher = CompositePathMatcher{}
|