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internal: Add basic simnet xmr swap.
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| module decred.org/dcrdex/client/cmd/bisonw-desktop | ||
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| go 1.21 | ||
| go 1.21.10 | ||
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| replace decred.org/dcrdex => ../../.. | ||
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,239 @@ | ||
| package dcr | ||
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| import "github.com/decred/dcrd/txscript/v4" | ||
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| func LockRefundTxScript(kal, kaf []byte, locktime int64) ([]byte, error) { | ||
| return txscript.NewScriptBuilder(). | ||
| AddOp(txscript.OP_IF). | ||
| AddOp(txscript.OP_2). | ||
| AddData(kal). | ||
| AddData(kaf). | ||
| AddOp(txscript.OP_2). | ||
| AddOp(txscript.OP_CHECKMULTISIG). | ||
| AddOp(txscript.OP_ELSE). | ||
| AddInt64(locktime). | ||
| AddOp(txscript.OP_CHECKSEQUENCEVERIFY). | ||
| AddOp(txscript.OP_DROP). | ||
| AddData(kaf). | ||
| AddOp(txscript.OP_CHECKSIG). | ||
| AddOp(txscript.OP_ENDIF). | ||
| Script() | ||
| } | ||
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| func LockTxScript(kal, kaf []byte) ([]byte, error) { | ||
| return txscript.NewScriptBuilder(). | ||
| AddOp(txscript.OP_2). | ||
| AddData(kal). | ||
| AddData(kaf). | ||
| AddOp(txscript.OP_2). | ||
| AddOp(txscript.OP_CHECKMULTISIG). | ||
| Script() | ||
| } | ||
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| // def verifySCLockTx(self, tx_bytes, script_out, | ||
| // swap_value, | ||
| // Kal, Kaf, | ||
| // feerate, | ||
| // check_lock_tx_inputs, vkbv=None): | ||
| // # Verify: | ||
| // # | ||
| // | ||
| // # Not necessary to check the lock txn is mineable, as protocol will wait for it to confirm | ||
| // # However by checking early we can avoid wasting time processing unmineable txns | ||
| // # Check fee is reasonable | ||
| // | ||
| // tx = self.loadTx(tx_bytes) | ||
| // txid = self.getTxid(tx) | ||
| // self._log.info('Verifying lock tx: {}.'.format(b2h(txid))) | ||
| // | ||
| // ensure(tx.nVersion == self.txVersion(), 'Bad version') | ||
| // ensure(tx.nLockTime == 0, 'Bad nLockTime') # TODO match txns created by cores | ||
| // | ||
| // script_pk = self.getScriptDest(script_out) | ||
| // locked_n = findOutput(tx, script_pk) | ||
| // ensure(locked_n is not None, 'Output not found in tx') | ||
| // locked_coin = tx.vout[locked_n].nValue | ||
| // | ||
| // # Check value | ||
| // ensure(locked_coin == swap_value, 'Bad locked value') | ||
| // | ||
| // # Check script | ||
| // A, B = self.extractScriptLockScriptValues(script_out) | ||
| // ensure(A == Kal, 'Bad script pubkey') | ||
| // ensure(B == Kaf, 'Bad script pubkey') | ||
| // | ||
| // if check_lock_tx_inputs: | ||
| // # TODO: Check that inputs are unspent | ||
| // # Verify fee rate | ||
| // inputs_value = 0 | ||
| // add_bytes = 0 | ||
| // add_witness_bytes = getCompactSizeLen(len(tx.vin)) | ||
| // for pi in tx.vin: | ||
| // ptx = self.rpc('getrawtransaction', [i2h(pi.prevout.hash), True]) | ||
| // prevout = ptx['vout'][pi.prevout.n] | ||
| // inputs_value += make_int(prevout['value']) | ||
| // | ||
| // prevout_type = prevout['scriptPubKey']['type'] | ||
| // if prevout_type == 'witness_v0_keyhash': | ||
| // add_witness_bytes += 107 # sig 72, pk 33 and 2 size bytes | ||
| // add_witness_bytes += getCompactSizeLen(107) | ||
| // else: | ||
| // # Assume P2PKH, TODO more types | ||
| // add_bytes += 107 # OP_PUSH72 <ecdsa_signature> OP_PUSH33 <public_key> | ||
| // | ||
| // outputs_value = 0 | ||
| // for txo in tx.vout: | ||
| // outputs_value += txo.nValue | ||
| // fee_paid = inputs_value - outputs_value | ||
| // assert (fee_paid > 0) | ||
| // | ||
| // vsize = self.getTxVSize(tx, add_bytes, add_witness_bytes) | ||
| // fee_rate_paid = fee_paid * 1000 // vsize | ||
| // | ||
| // self._log.info('tx amount, vsize, feerate: %ld, %ld, %ld', locked_coin, vsize, fee_rate_paid) | ||
| // | ||
| // if not self.compareFeeRates(fee_rate_paid, feerate): | ||
| // self._log.warning('feerate paid doesn\'t match expected: %ld, %ld', fee_rate_paid, feerate) | ||
| // # TODO: Display warning to user | ||
| // | ||
| // return txid, locked_n | ||
| // | ||
| // def verifySCLockRefundTx(self, tx_bytes, lock_tx_bytes, script_out, | ||
| // prevout_id, prevout_n, prevout_seq, prevout_script, | ||
| // Kal, Kaf, csv_val_expect, swap_value, feerate, vkbv=None): | ||
| // # Verify: | ||
| // # Must have only one input with correct prevout and sequence | ||
| // # Must have only one output to the p2wsh of the lock refund script | ||
| // # Output value must be locked_coin - lock tx fee | ||
| // | ||
| // tx = self.loadTx(tx_bytes) | ||
| // txid = self.getTxid(tx) | ||
| // self._log.info('Verifying lock refund tx: {}.'.format(b2h(txid))) | ||
| // | ||
| // ensure(tx.nVersion == self.txVersion(), 'Bad version') | ||
| // ensure(tx.nLockTime == 0, 'nLockTime not 0') | ||
| // ensure(len(tx.vin) == 1, 'tx doesn\'t have one input') | ||
| // | ||
| // ensure(tx.vin[0].nSequence == prevout_seq, 'Bad input nSequence') | ||
| // ensure(tx.vin[0].scriptSig == self.getScriptScriptSig(prevout_script), 'Input scriptsig mismatch') | ||
| // ensure(tx.vin[0].prevout.hash == b2i(prevout_id) and tx.vin[0].prevout.n == prevout_n, 'Input prevout mismatch') | ||
| // | ||
| // ensure(len(tx.vout) == 1, 'tx doesn\'t have one output') | ||
| // | ||
| // script_pk = self.getScriptDest(script_out) | ||
| // locked_n = findOutput(tx, script_pk) | ||
| // ensure(locked_n is not None, 'Output not found in tx') | ||
| // locked_coin = tx.vout[locked_n].nValue | ||
| // | ||
| // # Check script and values | ||
| // A, B, csv_val, C = self.extractScriptLockRefundScriptValues(script_out) | ||
| // ensure(A == Kal, 'Bad script pubkey') | ||
| // ensure(B == Kaf, 'Bad script pubkey') | ||
| // ensure(csv_val == csv_val_expect, 'Bad script csv value') | ||
| // ensure(C == Kaf, 'Bad script pubkey') | ||
| // | ||
| // fee_paid = swap_value - locked_coin | ||
| // assert (fee_paid > 0) | ||
| // | ||
| // dummy_witness_stack = self.getScriptLockTxDummyWitness(prevout_script) | ||
| // witness_bytes = self.getWitnessStackSerialisedLength(dummy_witness_stack) | ||
| // vsize = self.getTxVSize(tx, add_witness_bytes=witness_bytes) | ||
| // fee_rate_paid = fee_paid * 1000 // vsize | ||
| // | ||
| // self._log.info('tx amount, vsize, feerate: %ld, %ld, %ld', locked_coin, vsize, fee_rate_paid) | ||
| // | ||
| // if not self.compareFeeRates(fee_rate_paid, feerate): | ||
| // raise ValueError('Bad fee rate, expected: {}'.format(feerate)) | ||
| // | ||
| // return txid, locked_coin, locked_n | ||
| // | ||
| // def verifySCLockRefundSpendTx(self, tx_bytes, lock_refund_tx_bytes, | ||
| // lock_refund_tx_id, prevout_script, | ||
| // Kal, | ||
| // prevout_n, prevout_value, feerate, vkbv=None): | ||
| // # Verify: | ||
| // # Must have only one input with correct prevout (n is always 0) and sequence | ||
| // # Must have only one output sending lock refund tx value - fee to leader's address, TODO: follower shouldn't need to verify destination addr | ||
| // tx = self.loadTx(tx_bytes) | ||
| // txid = self.getTxid(tx) | ||
| // self._log.info('Verifying lock refund spend tx: {}.'.format(b2h(txid))) | ||
| // | ||
| // ensure(tx.nVersion == self.txVersion(), 'Bad version') | ||
| // ensure(tx.nLockTime == 0, 'nLockTime not 0') | ||
| // ensure(len(tx.vin) == 1, 'tx doesn\'t have one input') | ||
| // | ||
| // ensure(tx.vin[0].nSequence == 0, 'Bad input nSequence') | ||
| // ensure(tx.vin[0].scriptSig == self.getScriptScriptSig(prevout_script), 'Input scriptsig mismatch') | ||
| // ensure(tx.vin[0].prevout.hash == b2i(lock_refund_tx_id) and tx.vin[0].prevout.n == 0, 'Input prevout mismatch') | ||
| // | ||
| // ensure(len(tx.vout) == 1, 'tx doesn\'t have one output') | ||
| // | ||
| // # Destination doesn't matter to the follower | ||
| // ''' | ||
| // p2wpkh = CScript([OP_0, hash160(Kal)]) | ||
| // locked_n = findOutput(tx, p2wpkh) | ||
| // ensure(locked_n is not None, 'Output not found in lock refund spend tx') | ||
| // ''' | ||
| // tx_value = tx.vout[0].nValue | ||
| // | ||
| // fee_paid = prevout_value - tx_value | ||
| // assert (fee_paid > 0) | ||
| // | ||
| // dummy_witness_stack = self.getScriptLockRefundSpendTxDummyWitness(prevout_script) | ||
| // witness_bytes = self.getWitnessStackSerialisedLength(dummy_witness_stack) | ||
| // vsize = self.getTxVSize(tx, add_witness_bytes=witness_bytes) | ||
| // fee_rate_paid = fee_paid * 1000 // vsize | ||
| // | ||
| // self._log.info('tx amount, vsize, feerate: %ld, %ld, %ld', tx_value, vsize, fee_rate_paid) | ||
| // | ||
| // if not self.compareFeeRates(fee_rate_paid, feerate): | ||
| // raise ValueError('Bad fee rate, expected: {}'.format(feerate)) | ||
| // | ||
| // return True | ||
| // | ||
| // def verifySCLockSpendTx(self, tx_bytes, | ||
| // lock_tx_bytes, lock_tx_script, | ||
| // a_pkhash_f, feerate, vkbv=None): | ||
| // # Verify: | ||
| // # Must have only one input with correct prevout (n is always 0) and sequence | ||
| // # Must have only one output with destination and amount | ||
| // | ||
| // tx = self.loadTx(tx_bytes) | ||
| // txid = self.getTxid(tx) | ||
| // self._log.info('Verifying lock spend tx: {}.'.format(b2h(txid))) | ||
| // | ||
| // ensure(tx.nVersion == self.txVersion(), 'Bad version') | ||
| // ensure(tx.nLockTime == 0, 'nLockTime not 0') | ||
| // ensure(len(tx.vin) == 1, 'tx doesn\'t have one input') | ||
| // | ||
| // lock_tx = self.loadTx(lock_tx_bytes) | ||
| // lock_tx_id = self.getTxid(lock_tx) | ||
| // | ||
| // output_script = self.getScriptDest(lock_tx_script) | ||
| // locked_n = findOutput(lock_tx, output_script) | ||
| // ensure(locked_n is not None, 'Output not found in tx') | ||
| // locked_coin = lock_tx.vout[locked_n].nValue | ||
| // | ||
| // ensure(tx.vin[0].nSequence == 0, 'Bad input nSequence') | ||
| // ensure(tx.vin[0].scriptSig == self.getScriptScriptSig(lock_tx_script), 'Input scriptsig mismatch') | ||
| // ensure(tx.vin[0].prevout.hash == b2i(lock_tx_id) and tx.vin[0].prevout.n == locked_n, 'Input prevout mismatch') | ||
| // | ||
| // ensure(len(tx.vout) == 1, 'tx doesn\'t have one output') | ||
| // p2wpkh = self.getScriptForPubkeyHash(a_pkhash_f) | ||
| // ensure(tx.vout[0].scriptPubKey == p2wpkh, 'Bad output destination') | ||
| // | ||
| // # The value of the lock tx output should already be verified, if the fee is as expected the difference will be the correct amount | ||
| // fee_paid = locked_coin - tx.vout[0].nValue | ||
| // assert (fee_paid > 0) | ||
| // | ||
| // dummy_witness_stack = self.getScriptLockTxDummyWitness(lock_tx_script) | ||
| // witness_bytes = self.getWitnessStackSerialisedLength(dummy_witness_stack) | ||
| // vsize = self.getTxVSize(tx, add_witness_bytes=witness_bytes) | ||
| // fee_rate_paid = fee_paid * 1000 // vsize | ||
| // | ||
| // self._log.info('tx amount, vsize, feerate: %ld, %ld, %ld', tx.vout[0].nValue, vsize, fee_rate_paid) | ||
| // | ||
| // if not self.compareFeeRates(fee_rate_paid, feerate): | ||
| // raise ValueError('Bad fee rate, expected: {}'.format(feerate)) | ||
| // | ||
| // return True |
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