temp: split up input script gen

input/script_utils.go

@@ -2096,34 +2096,46 @@ func (c *CommitScriptTree) CtrlBlockForPath(path ScriptPath,
 	}
 }
 
-// NewLocalCommitScriptTree returns a new CommitScript tree that can be used to
-// create and spend the commitment output for the local party.
-func NewLocalCommitScriptTree(csvTimeout uint32,
-	selfKey, revokeKey *btcec.PublicKey) (*CommitScriptTree, error) {
+func NewLocalCommitDelayScript(csvTimeout uint32,
+	selfKey *btcec.PublicKey) ([]byte, error) {
 
-	// First, we'll need to construct the tapLeaf that'll be our delay CSV
-	// clause.
 	builder := txscript.NewScriptBuilder()
 	builder.AddData(schnorr.SerializePubKey(selfKey))
 	builder.AddOp(txscript.OP_CHECKSIG)
 	builder.AddInt64(int64(csvTimeout))
 	builder.AddOp(txscript.OP_CHECKSEQUENCEVERIFY)
 	builder.AddOp(txscript.OP_DROP)
 
-	delayScript, err := builder.Script()
-	if err != nil {
-		return nil, err
-	}
+	return builder.Script()
+}
 
-	// Next, we'll need to construct the revocation path, which is just a
-	// simple checksig script.
-	builder = txscript.NewScriptBuilder()
+func NewLocalCommitRevokeScript(selfKey, revokeKey *btcec.PublicKey) ([]byte,
+	error) {
+
+	builder := txscript.NewScriptBuilder()
 	builder.AddData(schnorr.SerializePubKey(selfKey))
 	builder.AddOp(txscript.OP_DROP)
 	builder.AddData(schnorr.SerializePubKey(revokeKey))
 	builder.AddOp(txscript.OP_CHECKSIG)
 
-	revokeScript, err := builder.Script()
+	return builder.Script()
+}
+
+// NewLocalCommitScriptTree returns a new CommitScript tree that can be used to
+// create and spend the commitment output for the local party.
+func NewLocalCommitScriptTree(csvTimeout uint32,
+	selfKey, revokeKey *btcec.PublicKey) (*CommitScriptTree, error) {
+
+	// First, we'll need to construct the tapLeaf that'll be our delay CSV
+	// clause.
+	delayScript, err := NewLocalCommitDelayScript(csvTimeout, selfKey)
+	if err != nil {
+		return nil, err
+	}
+
+	// Next, we'll need to construct the revocation path, which is just a
+	// simple checksig script.
+	revokeScript, err := NewLocalCommitRevokeScript(selfKey, revokeKey)
 	if err != nil {
 		return nil, err
 	}