func watch(c config.Config, key ...string) {
fmt.Println("Subscribing to changes for", key)
w, err := c.Watch(key...)
if err != nil {
fmt.Println(err)
return
}
go func() {
for {
v, err := w.Next()
if err != nil {
fmt.Println(err)
return
}
fmt.Println("Received value for key:", v.String("default"))
}
}()
for i := 0; i < 10; i++ {
fmt.Println("Writing change to file")
writeFile(i + 1)
time.Sleep(time.Second)
}
fmt.Println("Stopping subscriber")
w.Stop()
}
func (r *router) run(c config.Config) {
var routes Routes
// load routes immediately if possible
if err := c.Get(DefaultPath...).Scan(&routes); err != nil {
DefaultLogger.Error("[router] Failed to get routes", err)
} else {
r.update(routes)
}
var watcher config.Watcher
// try to get a watch
for i := 0; i < 100; i++ {
w, err := c.Watch(DefaultPath...)
if err != nil {
DefaultLogger.Error("[router] Failed to get watcher", err)
time.Sleep(time.Second)
continue
}
watcher = w
break
}
// if the watch is nil we exit
if watcher == nil {
DefaultLogger.Fatal("[router] Failed to get watcher in 100 attempts")
}
// watch and update routes
for {
// get next
v, err := watcher.Next()
if err != nil {
DefaultLogger.Error("[router] Watcher Next() Error", err)
time.Sleep(time.Second)
continue
}
var routes Routes
// scan into routes
if err := v.Scan(&routes); err != nil {
DefaultLogger.Error("[router] Failed to scan routes... skipping update", err)
continue
}
// update the routes
r.update(routes)
}
}