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dirwatch.go
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/
dirwatch.go
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// +build linux
package main
import (
"encoding/json"
"golang.org/x/exp/inotify"
"io/ioutil"
"log"
"os"
)
func init() {
directoryWatcher = DirectoryWatcher
}
func DirectoryWatcher(dir string) {
watcher, err := inotify.NewWatcher()
if err != nil {
log.Fatal(err)
}
err = watcher.AddWatch(dir, inotify.IN_CLOSE_WRITE)
if err != nil {
log.Fatal(err)
}
for {
select {
case ev := <-watcher.Event:
directoryWatcherFile(dir, ev.Name)
case err := <-watcher.Error:
log.Printf("directory watch: %s", err)
}
}
}
type TrackerStatusUpdate struct {
Conference string `json:"conference"`
TrackerStatus string `json:"tracker_status"`
Sequencer TrackerSequencer `json:"tracker_status_at"`
}
func directoryWatcherFile(dir, name string) {
if name[0:1] != "/" {
log.Printf("directory watch: %s: unexpected name", name)
return
}
content, err := ioutil.ReadFile(name)
if err != nil {
log.Printf("directory watch: %s", err)
return
}
var tsu TrackerStatusUpdate
err = json.Unmarshal(content, &tsu)
if err != nil {
log.Printf("directory watch: %s: %s", name, err)
return
}
site, err := LookupSite(tsu.Conference, "", false)
if err != nil {
log.Printf("directory watch: %s: %s", name, err)
return
} else if tsu.TrackerStatus == "" || tsu.Sequencer <= 0 {
log.Printf("directory watch: %s: bad status update", name)
return
}
if site != nil {
site.mu.Lock()
site.Update(SiteStatus{Status: tsu.TrackerStatus, Sequencer: tsu.Sequencer})
site.mu.Unlock()
}
os.Remove(name)
}