From 5fd25eb9cb52d09a4bf8b37b9d442e25bb22074e Mon Sep 17 00:00:00 2001 From: Andrew Chow Date: Tue, 1 Mar 2022 09:09:10 -0500 Subject: [PATCH] tests: Calculate input weight more accurately The external input test with specifying input weight would make a pessimistic estimate of the input weight. However this would result in a test failure as it is sometimes too pessimistic when an ECDSA signature ends up being smaller than usual. To correct this, we can calculate the input weight more accurately. Github-Pull: #24454 Rebased-From: 8a04a386f75d099f4b9864b0cdf7f26442b5801f --- test/functional/rpc_psbt.py | 11 ++++++++--- test/functional/wallet_send.py | 11 ++++++++--- 2 files changed, 16 insertions(+), 6 deletions(-) diff --git a/test/functional/rpc_psbt.py b/test/functional/rpc_psbt.py index b037807b535..797da909730 100755 --- a/test/functional/rpc_psbt.py +++ b/test/functional/rpc_psbt.py @@ -10,6 +10,10 @@ from itertools import product from test_framework.descriptors import descsum_create from test_framework.key import ECKey +from test_framework.messages import ( + ser_compact_size, + WITNESS_SCALE_FACTOR, +) from test_framework.test_framework import BitcoinTestFramework from test_framework.util import ( assert_approx, @@ -655,10 +659,11 @@ class PSBTTest(BitcoinTestFramework): break psbt_in = dec["inputs"][input_idx] # Calculate the input weight - # (prevout + sequence + length of scriptSig + 2 bytes buffer) * 4 + len of scriptwitness + # (prevout + sequence + length of scriptSig + scriptsig + 1 byte buffer) * WITNESS_SCALE_FACTOR + num scriptWitness stack items + (length of stack item + stack item) * N stack items + 1 byte buffer len_scriptsig = len(psbt_in["final_scriptSig"]["hex"]) // 2 if "final_scriptSig" in psbt_in else 0 - len_scriptwitness = len(psbt_in["final_scriptwitness"]["hex"]) // 2 if "final_scriptwitness" in psbt_in else 0 - input_weight = ((41 + len_scriptsig + 2) * 4) + len_scriptwitness + len_scriptsig += len(ser_compact_size(len_scriptsig)) + 1 + len_scriptwitness = (sum([(len(x) // 2) + len(ser_compact_size(len(x) // 2)) for x in psbt_in["final_scriptwitness"]]) + len(psbt_in["final_scriptwitness"]) + 1) if "final_scriptwitness" in psbt_in else 0 + input_weight = ((40 + len_scriptsig) * WITNESS_SCALE_FACTOR) + len_scriptwitness low_input_weight = input_weight // 2 high_input_weight = input_weight * 2 diff --git a/test/functional/wallet_send.py b/test/functional/wallet_send.py index 86e36be8f76..13cc7bad77c 100755 --- a/test/functional/wallet_send.py +++ b/test/functional/wallet_send.py @@ -10,6 +10,10 @@ from itertools import product from test_framework.authproxy import JSONRPCException from test_framework.descriptors import descsum_create from test_framework.key import ECKey +from test_framework.messages import ( + ser_compact_size, + WITNESS_SCALE_FACTOR, +) from test_framework.test_framework import BitcoinTestFramework from test_framework.util import ( assert_equal, @@ -526,10 +530,11 @@ class WalletSendTest(BitcoinTestFramework): break psbt_in = dec["inputs"][input_idx] # Calculate the input weight - # (prevout + sequence + length of scriptSig + 2 bytes buffer) * 4 + len of scriptwitness + # (prevout + sequence + length of scriptSig + scriptsig + 1 byte buffer) * WITNESS_SCALE_FACTOR + num scriptWitness stack items + (length of stack item + stack item) * N stack items + 1 byte buffer len_scriptsig = len(psbt_in["final_scriptSig"]["hex"]) // 2 if "final_scriptSig" in psbt_in else 0 - len_scriptwitness = len(psbt_in["final_scriptwitness"]["hex"]) // 2 if "final_scriptwitness" in psbt_in else 0 - input_weight = ((41 + len_scriptsig + 2) * 4) + len_scriptwitness + len_scriptsig += len(ser_compact_size(len_scriptsig)) + 1 + len_scriptwitness = (sum([(len(x) // 2) + len(ser_compact_size(len(x) // 2)) for x in psbt_in["final_scriptwitness"]]) + len(psbt_in["final_scriptwitness"]) + 1) if "final_scriptwitness" in psbt_in else 0 + input_weight = ((40 + len_scriptsig) * WITNESS_SCALE_FACTOR) + len_scriptwitness # Input weight error conditions assert_raises_rpc_error(