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Merge #20536: wallet: Error with "Transaction too large" if the funded tx will end up being too large after signing

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48a0319bab Add a test that selects too large if BnB is used (Andrew Chow)
3e69939b78 Fail if maximum weight is too large (Andrew Chow)
51e2cd322c Have CalculateMaximumSignedTxSize also compute tx weight (Andrew Chow)

Pull request description:

  Currently the `Transaction too large` is calculated on the transaction that is returned from `CreateTransaction`. This does not make sense for when `CreateTransaction` is being used for `fundrawtransaction` as no signing occurs so the final returned transaction is missing signatures. Thus users may successfully fund a transaction but fail to broadcast it after it has been fully signed.

  So instead we should figure out whether the transaction we are funding will be too large after it is signed. We can do this by having `CalculateMaximumSignedTxSize` also return the transaction weight and then comparing that weight against the maximum weight.

ACKs for top commit:
  instagibbs:
    ACK 48a0319bab
  meshcollider:
    utACK 48a0319bab
  Xekyo:
    utACK with nits 48a0319bab

Tree-SHA512: 1700c60b07f67e2d5c591c5ccd131ac9f1861fab3def961c3c9c4b3281ec1063fe8e4f0f7f1038cac72692340856406bcee8fb45c8104d2ad34357a0ec878ac7
This commit is contained in:
Samuel Dobson
2021-03-09 10:04:55 +13:00
parent 2067f9e5e8 48a0319bab
commit a8b0892b74
4 changed files with 37 additions and 10 deletions
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2
src/wallet/feebumper.cpp
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@@ -190,7 +190,7 @@ Result CreateRateBumpTransaction(CWallet& wallet, const uint256& txid, const CCo
if (coin_control.m_feerate) {
// The user provided a feeRate argument.
// We calculate this here to avoid compiler warning on the cs_wallet lock
const int64_t maxTxSize = CalculateMaximumSignedTxSize(*wtx.tx, &wallet);
const int64_t maxTxSize = CalculateMaximumSignedTxSize(*wtx.tx, &wallet).first;
Result res = CheckFeeRate(wallet, wtx, *new_coin_control.m_feerate, maxTxSize, errors);
if (res != Result::OK) {
return res;