This is a well-intentioned but realistically annoying warning. Unfortunately,
it's too easy for a warning in one header to cause dozens of repeated warnings.
Previously, transaction metadata (height, coinbase or not, and before
the previous commit also nVersion) was only stored for undo records
that correspond to the last output of a transaction being spent.
This only saves 2 bytes per undo record. Change this to storing this
information for every undo record, and stop complaining for having it
in non-last output spends. This means that undo dat written with
this patch won't be readable by older versions anymore.
This makes the following changes:
* In undo data and the chainstate database, the transaction nVersion
field is removed from the data structures, always written as 0, and
ignored when reading.
* The definition of hash_serialized in gettxoutsetinfo is changed to no
longer incude the nVersion field. It is renamed to hash_serialized_2
to avoid confusion. The new definition also includes transaction
height and coinbase information, as this information was missing
before.
This depends on having a CHashVerifier-based undo data checksum
verifier.
Apart from changing the definition of serialized_hash, downgrading
after using this patch is supported, as no release ever used the value
of nVersion field in UTXO entries.
This is necessary later, when we drop the nVersion field from the undo
data. At that point deserializing and reserializing the data won't
roundtrip anymore, and thus that approach can't be used to verify
checksums anymore.
With this CHashVerifier approach, we can deserialize while hashing the
exact serialized form that was used. This is both more efficient and
more correct in that case.
The error() function unconditionally reports an error. It should only
be used for actually exception situations, and not for the type of
inconsistencies that ApplyTxInUndo/DisconnectBlock can graciously deal
with.
This also makes a subtle semantics change: in ApplyTxInUndo, when a
record with metadata is encountered (indicating it is the last spend
from a tx), don't wipe the CCoins record if it wasn't empty at that
point. This makes sure that UTXO operations never affect any other
UTXOs (including those from the same tx).
513da90cd Add test for empty chain and reorg consistency for gettxoutsetinfo. (Gregory Maxwell)
822755a42 Fix: make CCoinsViewDbCursor::Seek work for missing keys (Pieter Wuille)
Tree-SHA512: e549921e8b8f599bf61ebe0ee7ef1d2f474043723d633e24665fe434b996a98e039612de8a1c2cd16b63f154943ff5ea1c1935e9561cfb813a00d47d926d0b22
No change in behavior. Get rid of specifiedConfirmTarget if/else block and
rename specifiedConfirmTarget and ignoreUserSetFee variables to
ignoreGlobalPayTxFee.
The current message is not helpful. Hardly anyone even remembers that
bitcoind used to be a cli utility, let alone new users. Print what the
actual problem is.
211adc0 Use range-based for loops (C++11) when looping over vector elements (practicalswift)
Tree-SHA512: 0e007f20dcef99d3c7a1036265e00f689d69f42e02fd82dd8389f45b52d31947e5f9388de2610d3d9bd9f554915ce0d35ebce561e5ae3a9013956d0ee4937145
5844609 [net] Avoid initialization to a value that is never read (practicalswift)
Tree-SHA512: 068c3fba58034187f546688bc9b8b7317e0657e797850613fb6289a4efc28637e4d06a0fa5e57480538c6b8340ed6d6a6c6f9a96f130b698d5d60975490a03d8
A few code changes were needed to accompany the test:
* Adding setObjectName() calls for a few Qt controls to make them easily
accessible from the test.
* Calling contextMenu->popup() instead of contextMenu->exec() to open
the transaction list context menu without blocking the test thread.
* Opening the context menu at the contextualMenu event point rather than
the cursor position (this change was not strictly needed to make the test
work, but is more correct).
* Updating the bumped transaction row with showTransaction=true instead of
false. This is needed to prevent the bumped tx from being hidden, so the last
part of the test which attempts to bump the bumped tx can work. (Technically
this change is a more general bugfix not limited to the testing environment,
but the bug doesn't happen outside of the testing environment because in the
full Qt client, a queued NotifyTransactionChanged notification causes the row
to be updated twice, first with showTransaction=false, then immediately after
with showTransaction=true.)
