add api endpoints and change config syntax

internal/streams/streams.go

@@ -14,9 +14,9 @@ import (
 
 func Init() {
 	var cfg struct {
-		Streams map[string]any `yaml:"streams"`
-		Publish map[string]any `yaml:"publish"`
-		Preload []string       `yaml:"preload"`
+		Streams map[string]any    `yaml:"streams"`
+		Publish map[string]any    `yaml:"publish"`
+		Preload map[string]string `yaml:"preload"`
 	}
 
 	app.LoadConfig(&cfg)
@@ -29,6 +29,7 @@ func Init() {
 
 	api.HandleFunc("api/streams", apiStreams)
 	api.HandleFunc("api/streams.dot", apiStreamsDOT)
+	api.HandleFunc("api/preload", apiPreload)
 
 	if cfg.Publish == nil && cfg.Preload == nil {
 		return
@@ -44,8 +45,8 @@ func Init() {
 		}
 
 		if cfg.Preload != nil {
-			for _, src := range cfg.Preload {
-				Preload(src)
+			for name, rawQuery := range cfg.Preload {
+				Preload(name, rawQuery)
 			}
 		}
 	})