func processResults(dbMan db.DatabaseManager) {
for {
log.Println("waiting for job")
job := WorkerPool.WaitForJob()
if job == nil {
backoff += 5 // add 5 seconds every time there are no jobs to process
time.Sleep(backoff * time.Second)
continue
} else {
backoff = 5 // reset backoff
log.Println("got job")
}
if job.Result == nil {
log.Println("job result in nil:", job.Err)
} else {
result := job.Result.(feedFetchResult)
if result.err != nil {
log.Println("got error: ", result.err)
} else {
if job.Args[0].(string) == "kill" {
break
}
url := job.Args[0].(string)
// send out notifications
ids := dbMan.GetSubscribers(url)
for _, id := range ids {
log.Print("send notification to: ", id, result.feed)
}
log.Printf("found: %s %q\n", url, result.feed)
}
}
}
}
// GetFeedByID returns a feed by it's guid
func GetFeedByID(dbManager db.DatabaseManager) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
feedID := r.URL.Query().Get("id")
// get from db
dbManager.GetFeed(feedID)
})
}
// AddFeed add a feed by its url
func AddFeed(dbManager db.DatabaseManager) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// get raw via http get, parse, then add into db
decoder := json.NewDecoder(r.Body)
var reqPayload subscribeStruct
err := decoder.Decode(&reqPayload)
// TODO: validate url is an actual http address and nothing else, maybe regex?
if err != nil {
// throw some error
log.Println(err)
sendError(w, "Error: I don't understand your url :(", http.StatusInternalServerError)
} else {
log.Println(reqPayload.URL)
if dbManager.SubscribeToFeed(reqPayload.GcmClientID, reqPayload.URL) {
// TODO: send push notification when this feed is available
WorkerPool.Add(retrieveFeed, reqPayload.URL, reqPayload.GcmClientID)
w.WriteHeader(http.StatusAccepted)
} else {
log.Println("user already subscribed")
sendError(w, "Error: user already subscribed", http.StatusConflict)
}
}
})
}