channeldb: move payment status code into new file

This prepares the following expansion of the payment status codes.

channeldb/payment_status.go

@@ -0,0 +1,42 @@
+package channeldb
+
+// PaymentStatus represent current status of payment.
+type PaymentStatus byte
+
+const (
+	// StatusUnknown is the status where a payment has never been initiated
+	// and hence is unknown.
+	StatusUnknown PaymentStatus = 0
+
+	// StatusInFlight is the status where a payment has been initiated, but
+	// a response has not been received.
+	StatusInFlight PaymentStatus = 1
+
+	// StatusSucceeded is the status where a payment has been initiated and
+	// the payment was completed successfully.
+	StatusSucceeded PaymentStatus = 2
+
+	// StatusFailed is the status where a payment has been initiated and a
+	// failure result has come back.
+	StatusFailed PaymentStatus = 3
+)
+
+// String returns readable representation of payment status.
+func (ps PaymentStatus) String() string {
+	switch ps {
+	case StatusUnknown:
+		return "Unknown"
+
+	case StatusInFlight:
+		return "In Flight"
+
+	case StatusSucceeded:
+		return "Succeeded"
+
+	case StatusFailed:
+		return "Failed"
+
+	default:
+		return "Unknown"
+	}
+}

channeldb/payments.go

@@ -175,43 +175,6 @@ func (r FailureReason) String() string {
 	return "unknown"
 }
 
-// PaymentStatus represent current status of payment
-type PaymentStatus byte
-
-const (
-	// StatusUnknown is the status where a payment has never been initiated
-	// and hence is unknown.
-	StatusUnknown PaymentStatus = 0
-
-	// StatusInFlight is the status where a payment has been initiated, but
-	// a response has not been received.
-	StatusInFlight PaymentStatus = 1
-
-	// StatusSucceeded is the status where a payment has been initiated and
-	// the payment was completed successfully.
-	StatusSucceeded PaymentStatus = 2
-
-	// StatusFailed is the status where a payment has been initiated and a
-	// failure result has come back.
-	StatusFailed PaymentStatus = 3
-)
-
-// String returns readable representation of payment status.
-func (ps PaymentStatus) String() string {
-	switch ps {
-	case StatusUnknown:
-		return "Unknown"
-	case StatusInFlight:
-		return "In Flight"
-	case StatusSucceeded:
-		return "Succeeded"
-	case StatusFailed:
-		return "Failed"
-	default:
-		return "Unknown"
-	}
-}
-
 // PaymentCreationInfo is the information necessary to have ready when
 // initiating a payment, moving it into state InFlight.
 type PaymentCreationInfo struct {