Implement simple PGDC methods for storage

* sanitize code a little
* move e2e build to 'e2e' tag

frontend/http/frontend.go

@@ -186,7 +186,7 @@ func NewFrontend(logic frontend.TrackerLogic, provided Config) (*Frontend, error
 
 	if cfg.Addr != "" {
 		go func() {
-			if err := f.serveHTTP(router,false); err != nil {
+			if err := f.serveHTTP(router, false); err != nil {
 				log.Fatal("failed while serving http", log.Err(err))
 			}
 		}()
@@ -194,7 +194,7 @@ func NewFrontend(logic frontend.TrackerLogic, provided Config) (*Frontend, error
 
 	if cfg.HTTPSAddr != "" {
 		go func() {
-			if err := f.serveHTTP(router,true); err != nil {
+			if err := f.serveHTTP(router, true); err != nil {
 				log.Fatal("failed while serving https", log.Err(err))
 			}
 		}()
@@ -245,7 +245,7 @@ func (f *Frontend) serveHTTP(handler http.Handler, tls bool) error {
 		srv.TLSConfig = f.tlsCfg
 		f.tlsSrv = srv
 		err = srv.ListenAndServe()
-	} else{
+	} else {
 		srv.Addr = f.Addr
 		f.srv = srv
 		err = f.tlsSrv.ListenAndServeTLS("", "")

frontend/http/parser.go

@@ -67,11 +67,10 @@ func ParseAnnounce(r *http.Request, opts ParseOptions) (*bittorrent.AnnounceRequ
 	if !ok {
 		return nil, bittorrent.ClientError("failed to parse parameter: peer_id")
 	}
-	if len(peerID) != bittorrent.PeerIDLen {
-		return nil, bittorrent.ClientError("failed to provide valid peer_id")
+	request.Peer.ID, err = bittorrent.NewPeerID([]byte(peerID))
+	if err != nil {
+		return nil, err
 	}
-	request.Peer.ID = bittorrent.NewPeerID([]byte(peerID))
-
 	// Determine the number of remaining bytes for the client.
 	request.Left, err = qp.Uint64("left")
 	if err != nil {

frontend/http/writer.go

@@ -23,7 +23,7 @@ func WriteError(w http.ResponseWriter, err error) {
 	w.WriteHeader(http.StatusOK)
 	if err = bencode.NewEncoder(w).Encode(map[string]interface{}{
 		"failure reason": message,
-	}); err != nil{
+	}); err != nil {
 		log.Error("unable to encode string", log.Err(err))
 	}
 }