split session tracker helpers

internal/service/session_tracker_keys.go

@@ -0,0 +1,37 @@
+package service
+
+import "strings"
+
+func fallbackSessionDeviceID(deviceName, client, remoteEndPoint string) string {
+	parts := []string{strings.TrimSpace(deviceName), strings.TrimSpace(client), strings.TrimSpace(remoteEndPoint)}
+	joined := strings.Trim(strings.Join(parts, "|"), "|")
+	if joined == "" {
+		joined = "unknown"
+	}
+	return "rt-" + fingerprint(client, joined)
+}
+
+func sessionDeviceKey(sess RealtimeSession) string {
+	return realtimeSessionTerminalKey(sess.DeviceID, sess.DeviceName, sess.Client, sess.RemoteEndPoint)
+}
+
+func realtimeSessionTerminalKey(deviceID, deviceName, client, remoteEndPoint string) string {
+	deviceName = strings.TrimSpace(deviceName)
+	if deviceName != "" {
+		return "fp-" + fingerprint(client, deviceName)
+	}
+	deviceID = strings.TrimSpace(deviceID)
+	if deviceID != "" {
+		return deviceID
+	}
+	return fallbackSessionDeviceID(deviceName, client, remoteEndPoint)
+}
+
+func firstNonEmptyString(values ...string) string {
+	for _, value := range values {
+		if strings.TrimSpace(value) != "" {
+			return strings.TrimSpace(value)
+		}
+	}
+	return ""
+}