87ab69155d
1632fc104btxgraph: Track multiple potential would-be clusters in Trim (improvement) (Pieter Wuille)4608df37e0txgraph: add Trim benchmark (benchmark) (Pieter Wuille)9c436ff01ctxgraph: add fuzz test scenario that avoids cycles inside Trim() (tests) (Pieter Wuille)938e86f8fetxgraph: add unit test for TxGraph::Trim (tests) (glozow)a04e205ab0txgraph: Add ability to trim oversized clusters (feature) (Pieter Wuille)eabcd0eb6ftxgraph: remove unnecessary m_group_oversized (simplification) (Greg Sanders)19b14e61eatxgraph: Permit transactions that exceed cluster size limit (feature) (Pieter Wuille)c4287b9b71txgraph: Add ability to configure maximum cluster size/weight (feature) (Pieter Wuille) Pull request description: Part of cluster mempool (#30289). During reorganisations, it is possible that dependencies get added which would result in clusters that violate policy limits (cluster count, cluster weight), when linking the new from-block transactions to the old from-mempool transactions. Unlike RBF scenarios, we cannot simply reject the changes when they are due to received blocks. To accommodate this, add a `TxGraph::Trim()`, which removes some subset of transactions (including descendants) in order to make all resulting clusters satisfy the limits. Conceptually, the way this is done is by defining a rudimentary linearization for the entire would-be too-large cluster, iterating it from beginning to end, and reasoning about the counts and weights of the clusters that would be reached using transactions up to that point. If a transaction is encountered whose addition would violate the limit, it is removed, together with all its descendants. This rudimentary linearization is like a merge sort of the chunks of the clusters being combined, but respecting topology. More specifically, it is continuously picking the highest-chunk-feerate remaining transaction among those which have no unmet dependencies left. For efficiency, this rudimentary linearization is computed lazily, by putting all viable transactions in a heap, sorted by chunk feerate, and adding new transactions to it as they become viable. The `Trim()` function is rather unusual compared to the `TxGraph` functionality added in previous PRs, in that `Trim()` makes it own decisions about what the resulting graph contents will be, without good specification of how it makes that decision - it is just a best-effort attempt (which is improved in the last commit). All other `TxGraph` mutators are simply to inform the graph about changes the calling mempool code decided on; this one lets the decision be made by txgraph. As part of this, the "oversized" property is expanded to also encompass a configurable cluster weight limit (in addition to cluster count limit). ACKs for top commit: instagibbs: reACK1632fc104bglozow: reACK1632fc104bvia range-diff ismaelsadeeq: reACK1632fc104b🛰️ Tree-SHA512: ccacb54be8ad622bd2717905fc9b7e42aea4b07f824de1924da9237027a97a9a2f1b862bc6a791cbd2e1a01897ad2c7c73c398a2d5ccbce90bfbeac0bcebc9ce
Bitcoin Core integration/staging tree
For an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/.
What is Bitcoin Core?
Bitcoin Core connects to the Bitcoin peer-to-peer network to download and fully validate blocks and transactions. It also includes a wallet and graphical user interface, which can be optionally built.
Further information about Bitcoin Core is available in the doc folder.
License
Bitcoin Core is released under the terms of the MIT license. See COPYING for more information or see https://opensource.org/license/MIT.
Development Process
The master branch is regularly built (see doc/build-*.md for instructions) and tested, but it is not guaranteed to be
completely stable. Tags are created
regularly from release branches to indicate new official, stable release versions of Bitcoin Core.
The https://github.com/bitcoin-core/gui repository is used exclusively for the development of the GUI. Its master branch is identical in all monotree repositories. Release branches and tags do not exist, so please do not fork that repository unless it is for development reasons.
The contribution workflow is described in CONTRIBUTING.md and useful hints for developers can be found in doc/developer-notes.md.
Testing
Testing and code review is the bottleneck for development; we get more pull requests than we can review and test on short notice. Please be patient and help out by testing other people's pull requests, and remember this is a security-critical project where any mistake might cost people lots of money.
Automated Testing
Developers are strongly encouraged to write unit tests for new code, and to
submit new unit tests for old code. Unit tests can be compiled and run
(assuming they weren't disabled during the generation of the build system) with: ctest. Further details on running
and extending unit tests can be found in /src/test/README.md.
There are also regression and integration tests, written
in Python.
These tests can be run (if the test dependencies are installed) with: build/test/functional/test_runner.py
(assuming build is your build directory).
The CI (Continuous Integration) systems make sure that every pull request is tested on Windows, Linux, and macOS. The CI must pass on all commits before merge to avoid unrelated CI failures on new pull requests.
Manual Quality Assurance (QA) Testing
Changes should be tested by somebody other than the developer who wrote the code. This is especially important for large or high-risk changes. It is useful to add a test plan to the pull request description if testing the changes is not straightforward.
Translations
Changes to translations as well as new translations can be submitted to Bitcoin Core's Transifex page.
Translations are periodically pulled from Transifex and merged into the git repository. See the translation process for details on how this works.
Important: We do not accept translation changes as GitHub pull requests because the next pull from Transifex would automatically overwrite them again.