tapfreighter: rename state SendStateReceiverProofTransfer

Renamed the `ChainPorter` state `SendStateReceiverProofTransfer` to
`SendStateTransferProofs` for better clarity.

This change makes it clear that in that state the `ChainPorter` may
transfer multiple proofs.

Author: ffranr

tapfreighter/chain_porter.go

@@ -443,7 +443,7 @@ func (p *ChainPorter) storeProofs(sendPkg *sendPackage) error {
 		log.Debugf("Not updating proofs as there are no active " +
 			"transfers")
 
-		sendPkg.SendState = SendStateReceiverProofTransfer
+		sendPkg.SendState = SendStateTransferProofs
 		return nil
 	}
 
@@ -532,7 +532,7 @@ func (p *ChainPorter) storeProofs(sendPkg *sendPackage) error {
 		}
 	}
 
-	sendPkg.SendState = SendStateReceiverProofTransfer
+	sendPkg.SendState = SendStateTransferProofs
 	return nil
 }
 
@@ -1164,8 +1164,8 @@ func (p *ChainPorter) stateStep(currentPkg sendPackage) (*sendPackage, error) {
 
 	// At this point, the transfer transaction is confirmed on-chain, and
 	// we've stored the sender and receiver proofs in the proof archive.
-	// We'll now attempt to transfer the receiver proof to the receiver.
-	case SendStateReceiverProofTransfer:
+	// We'll now attempt to transfer one or more proofs to the receiver(s).
+	case SendStateTransferProofs:
 		// We'll set the package state to complete early here so the
 		// main loop breaks out. We'll continue to attempt proof
 		// deliver in the background.
@@ -1181,7 +1181,7 @@ func (p *ChainPorter) stateStep(currentPkg sendPackage) (*sendPackage, error) {
 					"proof: %v", err)
 
 				p.publishSubscriberEvent(newAssetSendErrorEvent(
-					err, SendStateReceiverProofTransfer,
+					err, SendStateTransferProofs,
 					currentPkg,
 				))
 			}

tapfreighter/parcel.go

@@ -55,9 +55,9 @@ const (
 	// and receiver proofs to the proof archive.
 	SendStateStoreProofs
 
-	// SendStateReceiverProofTransfer is the state in which we will commence
-	// the receiver proof transfer process.
-	SendStateReceiverProofTransfer
+	// SendStateTransferProofs is the state where we attempt to transfer
+	// on-chain transaction proof(s) to the receiving party or parties.
+	SendStateTransferProofs
 
 	// SendStateComplete is the state which is reached once entire asset
 	// transfer process is complete.
@@ -88,8 +88,8 @@ func (s SendState) String() string {
 	case SendStateStoreProofs:
 		return "SendStateStoreProofs"
 
-	case SendStateReceiverProofTransfer:
-		return "SendStateReceiverProofTransfer"
+	case SendStateTransferProofs:
+		return "SendStateTransferProofs"
 
 	case SendStateComplete:
 		return "SendStateComplete"