50 lines
1.5 KiB
Go
50 lines
1.5 KiB
Go
// Package filenotify provides a mechanism for watching file(s) for changes.
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// Generally leans on fsnotify, but provides a poll-based notifier which fsnotify does not support.
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// These are wrapped up in a common interface so that either can be used interchangeably in your code.
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//
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// This package is adapted from https://github.com/moby/moby/tree/master/pkg/filenotify, Apache-2.0 License.
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// Hopefully this can be replaced with an external package sometime in the future, see https://github.com/fsnotify/fsnotify/issues/9
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package filenotify
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import (
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"time"
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"github.com/fsnotify/fsnotify"
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)
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// FileWatcher is an interface for implementing file notification watchers
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type FileWatcher interface {
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Events() <-chan fsnotify.Event
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Errors() <-chan error
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Add(name string) error
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Remove(name string) error
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Close() error
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}
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// New tries to use an fs-event watcher, and falls back to the poller if there is an error
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func New(interval time.Duration) (FileWatcher, error) {
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if watcher, err := NewEventWatcher(); err == nil {
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return watcher, nil
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}
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return NewPollingWatcher(interval), nil
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}
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// NewPollingWatcher returns a poll-based file watcher
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func NewPollingWatcher(interval time.Duration) FileWatcher {
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return &filePoller{
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interval: interval,
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done: make(chan struct{}),
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events: make(chan fsnotify.Event),
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errors: make(chan error),
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}
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}
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// NewEventWatcher returns an fs-event based file watcher
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func NewEventWatcher() (FileWatcher, error) {
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watcher, err := fsnotify.NewWatcher()
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if err != nil {
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return nil, err
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}
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return &fsNotifyWatcher{watcher}, nil
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}
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