also retry requests if connection closed; add /_/info endpoint

lib/cfg/init.go

@@ -18,6 +18,9 @@ const ImageCacheControl = "max-age=600; public" // 10 minutes by default, only u
 // proxy streams (hls playlist files and track parts)
 const ProxyStreams = false
 
+// enable /_/info endpoint (shows if some settings are enabled/disabled)
+const InstanceInfo = true
+
 // time-to-live for clientid cache
 // larger number will improve performance (no need to recheck everytime) but might make soundcloak briefly unusable for a larger amount of time if the client id is invalidated
 const ClientIDTTL = 30 * time.Minute

lib/sc/init.go

@@ -123,7 +123,7 @@ func DoWithRetry(httpc *fasthttp.HostClient, req *fasthttp.Request, resp *fastht
 			return nil
 		}
 
-		if !os.IsTimeout(err) && err != fasthttp.ErrTimeout {
+		if !os.IsTimeout(err) && err != fasthttp.ErrTimeout && err != fasthttp.ErrConnectionClosed {
 			return
 		}
 	}

main.go

@@ -142,6 +142,28 @@ func main() {
 		proxystreams.Load(app)
 	}
 
+	if cfg.InstanceInfo {
+		type info struct {
+			ProxyImages       bool
+			ProxyStreams      bool
+			FullyPreloadTrack bool
+		}
+
+		data, err := cfg.JSON.Marshal(info{
+			ProxyImages:       cfg.ProxyImages,
+			ProxyStreams:      cfg.ProxyStreams,
+			FullyPreloadTrack: cfg.FullyPreloadTrack,
+		})
+		if err != nil {
+			log.Println("Failed to marshal instance info:", err)
+		}
+
+		app.Get("/_/info", func(c *fiber.Ctx) error {
+			c.Set("Content-Type", "application/json")
+			return c.Send(data)
+		})
+	}
+
 	app.Get("/:user/sets", func(c *fiber.Ctx) error {
 		user, err := sc.GetUser(c.Params("user"))
 		if err != nil {