feat: make the cache size of static files configurable

Author: RoyXiang

README.md

@@ -33,6 +33,7 @@ env CGO_ENABLED=0 go install -trimpath -ldflags="-s -w" github.com/RoyXiang/plex
      * Set it if you run an instance of [Plaxt](https://github.com/XanderStrike/goplaxt)
      * Or, you can set it to [the official one](https://plaxt.astandke.com/)
    - `PLEX_TOKEN` (Optional, if you need it, see [here](https://support.plex.tv/articles/204059436-finding-an-authentication-token-x-plex-token/))
+   - `STATIC_CACHE_SIZE` (Optional, the cache size of static files, e.g. CSS files, images, default: `1000`)
    - `REDIRECT_WEB_APP` (Optional, default: `true`)
    - `DISABLE_TRANSCODE` (Optional, default: `true`)
    - `NO_REQUEST_LOGS` (Optional, default: `false`)

handler/main.go

@@ -21,6 +21,7 @@ func init() {
 		BaseUrl:          os.Getenv("PLEX_BASEURL"),
 		Token:            os.Getenv("PLEX_TOKEN"),
 		PlaxtUrl:         os.Getenv("PLAXT_URL"),
+		StaticCacheSize:  os.Getenv("STATIC_CACHE_SIZE"),
 		RedirectWebApp:   os.Getenv("REDIRECT_WEB_APP"),
 		DisableTranscode: os.Getenv("DISABLE_TRANSCODE"),
 		NoRequestLogs:    os.Getenv("NO_REQUEST_LOGS"),

handler/middleware.go

@@ -193,6 +193,9 @@ func cacheMiddleware(next http.Handler) http.Handler {
 		params := r.URL.Query()
 		switch info.Prefix {
 		case cachePrefixStatic:
+			if plexClient.staticCache == nil {
+				return
+			}
 			cache = plexClient.staticCache
 		case cachePrefixDynamic:
 			if user := r.Context().Value(userCtxKey); user != nil {

handler/plex.go

@@ -24,8 +24,7 @@ type PlexConfig struct {
 	BaseUrl          string
 	Token            string
 	PlaxtUrl         string
-	StaticCacheTtl   string
-	DynamicCacheTtl  string
+	StaticCacheSize  string
 	RedirectWebApp   string
 	DisableTranscode string
 	NoRequestLogs    string
@@ -78,7 +77,12 @@ func NewPlexClient(config PlexConfig) *PlexClient {
 		plaxtUrl = u.String()
 	}
 
-	staticCache := gcache.New(1000).LFU().Build()
+	var staticCache gcache.Cache
+	if config.StaticCacheSize == "" {
+		staticCache = gcache.New(1000).LFU().Build()
+	} else if staticCacheSize, err := strconv.Atoi(config.StaticCacheSize); err == nil && staticCacheSize > 0 {
+		staticCache = gcache.New(staticCacheSize).LFU().Build()
+	}
 	dynamicCache := gcache.New(100).LRU().Expiration(time.Second).Build()
 
 	var redirectWebApp, disableTranscode, noRequestLogs bool