mirror of
https://github.com/beego/bee.git
synced 2024-11-29 11:41:28 +00:00
94 lines
2.3 KiB
Markdown
94 lines
2.3 KiB
Markdown
|
# File system notifications for Go
|
||
|
|
|
||
|
|
[](http://godoc.org/github.com/howeyc/fsnotify)
|
||
|
|
|
||
|
|
Cross platform: Windows, Linux, BSD and OS X.
|
||
|
|
|
||
|
|
## Moving Notice
|
||
|
|
|
||
|
|
There is a fork being actively developed with a new API in preparation for the Go Standard Library:
|
||
|
|
[github.com/go-fsnotify/fsnotify](https://github.com/go-fsnotify/fsnotify)
|
||
|
|
|
||
|
|
## Example:
|
||
|
|
|
||
|
|
```go
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"log"
|
||
|
|
|
||
|
|
"github.com/howeyc/fsnotify"
|
||
|
|
)
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
watcher, err := fsnotify.NewWatcher()
|
||
|
|
if err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
done := make(chan bool)
|
||
|
|
|
||
|
|
// Process events
|
||
|
|
go func() {
|
||
|
|
for {
|
||
|
|
select {
|
||
|
|
case ev := <-watcher.Event:
|
||
|
|
log.Println("event:", ev)
|
||
|
|
case err := <-watcher.Error:
|
||
|
|
log.Println("error:", err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}()
|
||
|
|
|
||
|
|
err = watcher.Watch("testDir")
|
||
|
|
if err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Hang so program doesn't exit
|
||
|
|
<-done
|
||
|
|
|
||
|
|
/* ... do stuff ... */
|
||
|
|
watcher.Close()
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
For each event:
|
||
|
|
* Name
|
||
|
|
* IsCreate()
|
||
|
|
* IsDelete()
|
||
|
|
* IsModify()
|
||
|
|
* IsRename()
|
||
|
|
|
||
|
|
## FAQ
|
||
|
|
|
||
|
|
**When a file is moved to another directory is it still being watched?**
|
||
|
|
|
||
|
|
No (it shouldn't be, unless you are watching where it was moved to).
|
||
|
|
|
||
|
|
**When I watch a directory, are all subdirectories watched as well?**
|
||
|
|
|
||
|
|
No, you must add watches for any directory you want to watch (a recursive watcher is in the works [#56][]).
|
||
|
|
|
||
|
|
**Do I have to watch the Error and Event channels in a separate goroutine?**
|
||
|
|
|
||
|
|
As of now, yes. Looking into making this single-thread friendly (see [#7][])
|
||
|
|
|
||
|
|
**Why am I receiving multiple events for the same file on OS X?**
|
||
|
|
|
||
|
|
Spotlight indexing on OS X can result in multiple events (see [#62][]). A temporary workaround is to add your folder(s) to the *Spotlight Privacy settings* until we have a native FSEvents implementation (see [#54][]).
|
||
|
|
|
||
|
|
**How many files can be watched at once?**
|
||
|
|
|
||
|
|
There are OS-specific limits as to how many watches can be created:
|
||
|
|
* Linux: /proc/sys/fs/inotify/max_user_watches contains the limit,
|
||
|
|
reaching this limit results in a "no space left on device" error.
|
||
|
|
* BSD / OSX: sysctl variables "kern.maxfiles" and "kern.maxfilesperproc", reaching these limits results in a "too many open files" error.
|
||
|
|
|
||
|
|
|
||
|
|
[#62]: https://github.com/howeyc/fsnotify/issues/62
|
||
|
|
[#56]: https://github.com/howeyc/fsnotify/issues/56
|
||
|
|
[#54]: https://github.com/howeyc/fsnotify/issues/54
|
||
|
|
[#7]: https://github.com/howeyc/fsnotify/issues/7
|
||
|
|
|