tapfreighter: set ProofDeliveryComplete field on transfer output init

- Set the `ProofDeliveryComplete` field in the transfer output struct
during its initialization.

- The `insertAssetTransferOutput` function now only marshals the
`ProofDeliveryComplete` status for database storage. It does not
determine the status at the time of storing in the database.

- `TransferOutput.ShouldDeliverProof` will return `false` if
`ProofDeliveryComplete == fn.Some(true)`.

- Improved logging for scenarios where proof delivery is skipped,
specifically when `out.ShouldDeliverProof()` returns `false`.

tapdb/assets_store.go

@@ -2434,25 +2434,14 @@ func insertAssetTransferOutput(ctx context.Context, q ActiveAssetsStore,
 		return fmt.Errorf("unable to insert script key: %w", err)
 	}
 
-	// Now we will mark the output proof as undelivered if it is intended
-	// for a counterpart.
-	//
-	// If the transfer output proof is not intended for a counterpart the
-	// `proofDeliveryComplete` field will be left as NULL. Otherwise, we set
-	// it to false to indicate that the proof has not been delivered yet.
-	shouldDeliverProof, err := output.ShouldDeliverProof()
-	if err != nil {
-		return fmt.Errorf("unable to determine if proof should be "+
-			"delivery for given transfer output: %w", err)
-	}
-
+	// Marshal the proof delivery complete field to a nullable boolean.
 	var proofDeliveryComplete sql.NullBool
-	if shouldDeliverProof {
+	output.ProofDeliveryComplete.WhenSome(func(deliveryComplete bool) {
 		proofDeliveryComplete = sql.NullBool{
-			Bool:  false,
+			Bool:  deliveryComplete,
 			Valid: true,
 		}
-	}
+	})
 
 	// Check if position value can be stored in a 32-bit integer. Type cast
 	// if possible, otherwise return an error.

tapfreighter/chain_porter.go

@@ -656,8 +656,10 @@ func (p *ChainPorter) transferReceiverProof(pkg *sendPackage) error {
 		}
 
 		if !shouldDeliverProof {
-			log.Debugf("Not delivering proof for output with "+
-				"script key %x", key.SerializeCompressed())
+			log.Debugf("Not delivering transfer ouput proof "+
+				"(proof_delivery_status=%v, script_key=%x)",
+				out.ProofDeliveryComplete,
+				key.SerializeCompressed())
 			return nil
 		}
 

tapfreighter/interface.go

@@ -252,6 +252,14 @@ type TransferOutput struct {
 // ShouldDeliverProof returns true if a proof corresponding to the subject
 // transfer output should be delivered to a peer.
 func (out *TransferOutput) ShouldDeliverProof() (bool, error) {
+	// If any proof delivery is already complete (some true), no further
+	// delivery is needed. However, if the proof delivery status is
+	// unset (none), we won't use that status in determining whether proof
+	// delivery is necessary. The field may not be set yet.
+	if out.ProofDeliveryComplete.UnwrapOr(false) {
+		return false, nil
+	}
+
 	// If the proof courier address is unspecified, we don't need to deliver
 	// a proof.
 	if len(out.ProofCourierAddr) == 0 {

tapfreighter/parcel.go

@@ -604,7 +604,7 @@ func transferOutput(vPkt *tappsbt.VPacket, vOutIdx int, position uint64,
 		return nil, fmt.Errorf("unable to create anchor: %w", err)
 	}
 
-	return &TransferOutput{
+	out := TransferOutput{
 		Anchor:              *anchor,
 		Type:                vOut.Type,
 		ScriptKey:           vOut.ScriptKey,
@@ -618,7 +618,28 @@ func transferOutput(vPkt *tappsbt.VPacket, vOutIdx int, position uint64,
 		ProofCourierAddr:    proofCourierAddrBytes,
 		ScriptKeyLocal:      isLocalKey(vOut.ScriptKey),
 		Position:            position,
-	}, nil
+	}
+
+	// Determine whether an associated proof needs to be delivered to a peer
+	// based on the currently set fields.
+	shouldDeliverProof, err := out.ShouldDeliverProof()
+	if err != nil {
+		return nil, fmt.Errorf("unable to determine if transfer "+
+			"output proof should be delivery to a peer: %w", err)
+	}
+
+	if shouldDeliverProof {
+		// Set the `ProofDeliveryComplete` field to `Some(false)` to
+		// indicate that proof delivery is pending. Once the proof has
+		// been successfully  delivered, this field will be updated to
+		// `Some(true)`.
+		//
+		// If it was determined that the proof should not be delivered,
+		// the `ProofDeliveryComplete` field would remain `None`.
+		out.ProofDeliveryComplete = fn.Some(false)
+	}
+
+	return &out, nil
 }
 
 // outputAnchor creates an Anchor from an anchor transaction and a virtual