routing+channeldb: add more failure reasons

routing/payment_lifecycle.go

@@ -338,39 +338,41 @@ func (p *paymentLifecycle) sendPaymentAttempt(firstHop lnwire.ShortChannelID,
 // handleSendError inspects the given error from the Switch and determines
 // whether we should make another payment attempt.
 func (p *paymentLifecycle) handleSendError(sendErr error) error {
-	var finalOutcome bool
+	var reason channeldb.FailureReason
 
 	// If an internal, non-forwarding error occurred, we can stop trying.
 	fErr, ok := sendErr.(*htlcswitch.ForwardingError)
 	if !ok {
-		finalOutcome = true
+		reason = channeldb.FailureReasonError
 	} else {
-		finalOutcome = p.router.processSendError(
+		var final bool
+		final, reason = p.router.processSendError(
 			p.paySession, &p.attempt.Route, fErr,
 		)
 
-		// Save the forwarding error so it can be returned if this turns
-		// out to be the last attempt.
-		p.lastError = fErr
-	}
+		if !final {
+			// Save the forwarding error so it can be returned if
+			// this turns out to be the last attempt.
+			p.lastError = fErr
 
-	if finalOutcome {
-		log.Errorf("Payment %x failed with final outcome: %v",
-			p.payment.PaymentHash, sendErr)
-
-		// Mark the payment failed with no route.
-		// TODO(halseth): make payment codes for the actual reason we
-		// don't continue path finding.
-		err := p.router.cfg.Control.Fail(
-			p.payment.PaymentHash, channeldb.FailureReasonNoRoute,
-		)
-		if err != nil {
-			return err
+			return nil
 		}
-
-		// Terminal state, return the error we encountered.
-		return sendErr
 	}
 
-	return nil
+	log.Debugf("Payment %x failed: final_outcome=%v, raw_err=%v",
+		p.payment.PaymentHash, reason, sendErr)
+
+	// Mark the payment failed with no route.
+	//
+	// TODO(halseth): make payment codes for the actual reason we don't
+	// continue path finding.
+	err := p.router.cfg.Control.Fail(
+		p.payment.PaymentHash, reason,
+	)
+	if err != nil {
+		return err
+	}
+
+	// Terminal state, return the error we encountered.
+	return sendErr
 }