feat: runtime config, Matomo analytics, chat accounts, DM history/search, and Prometheus retention

backend/playout/src/playlist.go

@@ -612,6 +612,9 @@ func main() {
 		return
 	}
 
+	// Load shared HLS runtime config (written by the chat admin) before starting.
+	loadSharedHLSConfig()
+
 	fmt.Println("=== Linear Void Playout Service Starting ===")
 	fmt.Println("Playlist:", playlistPath)
 	fmt.Println("R2 Bucket:", bucket)
@@ -996,4 +999,33 @@ func runValidateOnly(playlistPath string) {
 		os.Exit(1)
 	}
 	fmt.Println("Playlist valid.")
+}
+
+// loadSharedHLSConfig reads HLS settings from the shared runtime config file
+// (written by the chat admin service) and overrides the env-derived defaults.
+func loadSharedHLSConfig() {
+	path := envWithDefault("PLAYOUT_CONFIG_PATH", "/app/playlist/config.json")
+	data, err := os.ReadFile(path)
+	if err != nil {
+		if !os.IsNotExist(err) {
+			fmt.Println("Warning: cannot read shared config:", err)
+		}
+		return
+	}
+	var cfg map[string]string
+	if err := json.Unmarshal(data, &cfg); err != nil {
+		fmt.Println("Warning: cannot parse shared config:", err)
+		return
+	}
+	if v := strings.TrimSpace(cfg["hls_segment_duration"]); v != "" {
+		if n, err := strconv.Atoi(v); err == nil && n > 0 {
+			hlsSegmentDuration = strconv.Itoa(n)
+		}
+	}
+	if v := strings.TrimSpace(cfg["hls_window_size"]); v != "" {
+		if n, err := strconv.Atoi(v); err == nil && n > 0 {
+			hlsWindowSize = strconv.Itoa(n)
+		}
+	}
+	fmt.Printf("Shared HLS config: segment=%ss window=%s\n", hlsSegmentDuration, hlsWindowSize)
 }

backend/playout/src/playlist_test.go

@@ -733,4 +733,48 @@ func TestHLSNextStartNumber(t *testing.T) {
 			t.Errorf("seg-%06d should be kept: %v", i, err)
 		}
 	}
+}
+
+func TestLoadSharedHLSConfig(t *testing.T) {
+	prevDur := hlsSegmentDuration
+	prevWin := hlsWindowSize
+	defer func() {
+		hlsSegmentDuration = prevDur
+		hlsWindowSize = prevWin
+	}()
+
+	tmpDir := t.TempDir()
+	cfgPath := filepath.Join(tmpDir, "config.json")
+	if err := os.WriteFile(cfgPath, []byte(`{"hls_segment_duration":"4","hls_window_size":"12"}`), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	os.Setenv("PLAYOUT_CONFIG_PATH", cfgPath)
+	defer os.Unsetenv("PLAYOUT_CONFIG_PATH")
+
+	loadSharedHLSConfig()
+
+	if hlsSegmentDuration != "4" {
+		t.Errorf("hlsSegmentDuration = %q, want 4", hlsSegmentDuration)
+	}
+	if hlsWindowSize != "12" {
+		t.Errorf("hlsWindowSize = %q, want 12", hlsWindowSize)
+	}
+}
+
+func TestLoadSharedHLSConfig_MissingFile(t *testing.T) {
+	prevDur := hlsSegmentDuration
+	prevWin := hlsWindowSize
+	defer func() {
+		hlsSegmentDuration = prevDur
+		hlsWindowSize = prevWin
+	}()
+
+	os.Setenv("PLAYOUT_CONFIG_PATH", filepath.Join(t.TempDir(), "nope.json"))
+	defer os.Unsetenv("PLAYOUT_CONFIG_PATH")
+
+	loadSharedHLSConfig() // should be a no-op without erroring
+
+	if hlsSegmentDuration != prevDur {
+		t.Errorf("hlsSegmentDuration changed to %q, want unchanged %q", hlsSegmentDuration, prevDur)
+	}
 }