aboutsummaryrefslogtreecommitdiff
path: root/vendor/github.com/hpcloud/tail/watch/watch.go
blob: 2e1783ef0aa63cc82db0f7de8563bcaa7ac1e4e8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
// Copyright (c) 2015 HPE Software Inc. All rights reserved.
// Copyright (c) 2013 ActiveState Software Inc. All rights reserved.

package watch

import "gopkg.in/tomb.v1"

// FileWatcher monitors file-level events.
type FileWatcher interface {
	// BlockUntilExists blocks until the file comes into existence.
	BlockUntilExists(*tomb.Tomb) error

	// ChangeEvents reports on changes to a file, be it modification,
	// deletion, renames or truncations. Returned FileChanges group of
	// channels will be closed, thus become unusable, after a deletion
	// or truncation event.
	// In order to properly report truncations, ChangeEvents requires
	// the caller to pass their current offset in the file.
	ChangeEvents(*tomb.Tomb, int64) (*FileChanges, error)
}