channeldb: convert settled boolean to state

This commit is a preparation for the addition of new invoice
states. A database migration is not needed because we keep
the same field length and values.

htlcswitch/link_test.go

@@ -236,7 +236,7 @@ func TestChannelLinkSingleHopPayment(t *testing.T) {
 	if err != nil {
 		t.Fatalf("unable to get invoice: %v", err)
 	}
-	if !invoice.Terms.Settled {
+	if invoice.Terms.State != channeldb.ContractSettled {
 		t.Fatal("alice invoice wasn't settled")
 	}
 
@@ -467,7 +467,7 @@ func TestChannelLinkMultiHopPayment(t *testing.T) {
 	if err != nil {
 		t.Fatalf("unable to get invoice: %v", err)
 	}
-	if !invoice.Terms.Settled {
+	if invoice.Terms.State != channeldb.ContractSettled {
 		t.Fatal("carol invoice haven't been settled")
 	}
 
@@ -818,7 +818,7 @@ func TestUpdateForwardingPolicy(t *testing.T) {
 	if err != nil {
 		t.Fatalf("unable to get invoice: %v", err)
 	}
-	if !invoice.Terms.Settled {
+	if invoice.Terms.State != channeldb.ContractSettled {
 		t.Fatal("carol invoice haven't been settled")
 	}
 
@@ -937,7 +937,7 @@ func TestChannelLinkMultiHopInsufficientPayment(t *testing.T) {
 	if err != nil {
 		t.Fatalf("unable to get invoice: %v", err)
 	}
-	if invoice.Terms.Settled {
+	if invoice.Terms.State == channeldb.ContractSettled {
 		t.Fatal("carol invoice have been settled")
 	}
 
@@ -1026,7 +1026,7 @@ func TestChannelLinkMultiHopUnknownPaymentHash(t *testing.T) {
 
 	// Check that alice invoice wasn't settled and bandwidth of htlc
 	// links hasn't been changed.
-	if invoice.Terms.Settled {
+	if invoice.Terms.State == channeldb.ContractSettled {
 		t.Fatal("alice invoice was settled")
 	}
 
@@ -1112,7 +1112,7 @@ func TestChannelLinkMultiHopUnknownNextHop(t *testing.T) {
 	if err != nil {
 		t.Fatalf("unable to get invoice: %v", err)
 	}
-	if invoice.Terms.Settled {
+	if invoice.Terms.State == channeldb.ContractSettled {
 		t.Fatal("carol invoice have been settled")
 	}
 
@@ -1227,7 +1227,7 @@ func TestChannelLinkMultiHopDecodeError(t *testing.T) {
 	if err != nil {
 		t.Fatalf("unable to get invoice: %v", err)
 	}
-	if invoice.Terms.Settled {
+	if invoice.Terms.State == channeldb.ContractSettled {
 		t.Fatal("carol invoice have been settled")
 	}
 
@@ -3332,7 +3332,7 @@ func TestChannelRetransmission(t *testing.T) {
 				err = errors.Errorf("unable to get invoice: %v", err)
 				continue
 			}
-			if !invoice.Terms.Settled {
+			if invoice.Terms.State != channeldb.ContractSettled {
 				err = errors.Errorf("alice invoice haven't been settled")
 				continue
 			}
@@ -3828,7 +3828,7 @@ func TestChannelLinkAcceptOverpay(t *testing.T) {
 	if err != nil {
 		t.Fatalf("unable to get invoice: %v", err)
 	}
-	if !invoice.Terms.Settled {
+	if invoice.Terms.State != channeldb.ContractSettled {
 		t.Fatal("carol invoice haven't been settled")
 	}