This adds a new CuckooCache in validation, caching whether all of a
transaction's scripts were valid with a given set of script flags.
Unlike previous attempts at caching an entire transaction's
validity, which have nearly universally introduced consensus
failures, this only caches the validity of a transaction's
scriptSigs. As these are pure functions of the transaction and
data it commits to, this should be much safer.
This is somewhat duplicative with the sigcache, as entries in the
new cache will also have several entries in the sigcache. However,
the sigcache is kept both as ATMP relies on it and because it
prevents malleability-based DoS attacks on the new higher-level
cache. Instead, the -sigcachesize option is re-used - cutting the
sigcache size in half and using the newly freed memory for the
script execution cache.
Transactions which match the script execution cache never even have
entries in the script check thread's workqueue created.
Note that the cache is indexed only on the script execution flags
and the transaction's witness hash. While this is sufficient to
make the CScriptCheck() calls pure functions, this introduces
dependancies on the mempool calculating things such as the
PrecomputedTransactionData object, filling the CCoinsViewCache, etc
in the exact same way as ConnectBlock. I belive this is a reasonable
assumption, but should be noted carefully.
In a rather naive benchmark (reindex-chainstate up to block 284k
with cuckoocache always returning true for contains(),
-assumevalid=0 and a very large dbcache), this connected blocks
~1.7x faster.
9a5a1d7 RPC/rawtransaction: createrawtransaction: Check opt_into_rbf when provided with either value (Luke Dashjr)
23b0fe3 bitcoin-tx: rbfoptin: Avoid touching nSequence if the value is already opting in (Luke Dashjr)
b005bf2 Introduce MAX_BIP125_RBF_SEQUENCE constant (Luke Dashjr)
575cde4 [bitcoin-tx] add rbfoptin command (Jonas Schnelli)
5d26244 [Tests] extend the replace-by-fee test to cover RPC rawtx features (Jonas Schnelli)
36bcab2 RPC/Wallet: Add RBF support for fundrawtransaction (Luke Dashjr)
891c5ee Wallet: Refactor FundTransaction to accept parameters via CCoinControl (Luke Dashjr)
578ec80 RPC: rawtransaction: Add RBF support for createrawtransaction (Luke Dashjr)
Tree-SHA512: 446e37c617c188cc3b3fd1e2841c98eda6f4869e71cb3249c4a9e54002607d0f1e6bef92187f7894d4e0746ab449cfee89be9f6a1a8831e25c70cf912eac1570
656dbd871 Perform member initialization in initialization lists where possible (practicalswift)
Tree-SHA512: 048380f4da23ab1eaaf471801a01dbd76f2235afb686c1489b30a6bac109195134afc83414b8378d3482a9042d537ec62d30136dadb9347cf06b07fb5c693208
8ad5bde Merge bctest.py into bitcoin-util-test.py (John Newbery)
95836c5 Use shared config file for functional and util tests (John Newbery)
89fcd35 Use an .ini config file for environment vars in bitcoin-util-test.py (John Newbery)
e9265df Change help_text in bitcoin-util-test.py to a docstring. (John Newbery)
ce58e93 Change bitcoin-util-test.py to use Python3 (John Newbery)
Tree-SHA512: 66dab0b4a8546aee0dfaef134a165f1447aff4c0ec335754bbc7d9e55909721c62f09cdbf4b22d02ac1fcd5a9b66780f91e1cc4d8687fae7288cc9072a23a78f
bctest.py is only used as an import by bitcoin-util-test.py. There's no
value in keeping it as a separate module, so let's merge them into a
single module to keep building and packaging simpler.
bitcoin-test-util is importable as a module, so if any future modules
really want to import the code from bctest.py, they can import
bitcoin-test-util and call the bctest functions by name.
24980a3 Make functions in validation.cpp static and pass chainparams (Mario Dian)
Tree-SHA512: 2d1b7b0ffd851317ed522911c1b6592855376c5cbc65d71ec0f8aa507eb6caef21b0709b3692255f1d719662db7447579c10df02f6ef4cd35fcb0bdf2e653af6
Downloading all the binaries of all platforms can take quite long,
especially for slow connections, which may deter people from using
this script and, therefore, to disregard security altogether.
This change introduces the new possibility of specifying the
platform along with the version number, so that only the binaries
that contain the platform name are downloaded.
Prior to per-utxo CCoins, we checked that no other in-mempool tx
spent any of the given transaction's outputs, as we don't want to
uncache that entire tx in such a case. However, we now are checking
only that there exists no other mempool spends of the same output,
which should clearly be impossible after we removed the transaction
which was spending said output (barring massive mempool
inconsistency).
Thanks to @sdaftuar for the suggestion.
At startup, we choose one peer to serve us the headers chain, until
our best header is close to caught up. Disconnect this peer if more
than 15 minutes + 1ms/expected_header passes and our best header
is still more than 1 day away from current time.
