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W. J. van der Laan 5c4f0c4d46
Merge bitcoin/bitcoin#21261: p2p: update inbound eviction protection for multiple networks, add I2P peers 
1b1088d52f test: add combined I2P/onion/localhost eviction protection tests (Jon Atack)
7c2284eda2 test: add tests for inbound eviction protection of I2P peers (Jon Atack)
ce02dd1ef1 p2p: extend inbound eviction protection by network to I2P peers (Jon Atack)
70bbc62711 test: add combined onion/localhost eviction protection coverage (Jon Atack)
045cb40192 p2p: remove unused m_is_onion member from NodeEvictionCandidate struct (Jon Atack)
310fab4928 p2p: remove unused CompareLocalHostTimeConnected() (Jon Atack)
9e889e8a5c p2p: remove unused CompareOnionTimeConnected() (Jon Atack)
787d46bb2a p2p: update ProtectEvictionCandidatesByRatio() doxygen docs (Jon Atack)
1e15acf478 p2p: make ProtectEvictionCandidatesByRatio() fully ratio-based (Jon Atack)
3f8105c4d2 test: remove combined onion/localhost eviction protection tests (Jon Atack)
38a81a8e20 p2p: add CompareNodeNetworkTime() comparator struct (Jon Atack)
4ee7aec47e p2p: add m_network to NodeEvictionCandidate struct (Jon Atack)
7321e6f2fe p2p, refactor: rename vEvictionCandidates to eviction_candidates (Jon Atack)
ec590f1d91 p2p, refactor: improve constness in ProtectEvictionCandidatesByRatio() (Jon Atack)
4a19f501ab test: add ALL_NETWORKS to test utilities (Jon Atack)
519e76bb64 test: speed up and simplify peer_eviction_test (Jon Atack)
1cde800523 p2p, refactor: rm redundant erase_size calculation in SelectNodeToEvict() (Jon Atack)

Pull request description:

  Continuing the work in #20197 and #20685, this pull updates and abstracts our inbound eviction protection to make it fully ratio-based and easily extensible to peers connected via high-latency privacy networks that we newly support, like I2P and perhaps others soon, as these peers are disadvantaged by the latency criteria of our eviction logic.

  It then adds eviction protection for peers connected over I2P.  As described in https://github.com/bitcoin/bitcoin/pull/20685#issuecomment-767486499, we've observed over the past few months that I2P peers have a min ping latency similar to or greater than that of onion peers.

  The algorithm is a basically a multi-pass knapsack:

  - Count the number of eviction candidates in each of the disadvantaged
    privacy networks.

  - Sort the networks from lower to higher candidate counts, so that
    a network with fewer candidates will have the first opportunity
    for any unused slots remaining from the previous iteration.  In
    the case of a tie in candidate counts, priority is given by array
    member order from first to last, guesstimated to favor more unusual
    networks.

  - Iterate through the networks in this order.  On each iteration,
    allocate each network an equal number of protected slots targeting
    a total number of candidates to protect, provided any slots remain
    in the knapsack.

  - Protect the candidates in that network having the longest uptime,
    if any in that network are present.

  - Continue iterating as long as we have non-allocated slots
    remaining and candidates available to protect.

  The goal of this logic is to favorise the diversity of our peer connections.

  The individual commit messages describe each change in more detail.

  Special thank you to Vasil Dimov for the excellent review feedback and the algorithm improvement that made this change much better than it would have been otherwise. Thanks also to Antoine Riard, whose review feedback nudged this change to protect disadvantaged networks having fewer, rather than more, eviction candidates.

ACKs for top commit:
  laanwj:
    Code review re-ACK 1b1088d52f
  vasild:
    ACK 1b1088d52f

Tree-SHA512: 722f790ff11f2969c79e45a5e0e938d94df78df8687e77002f32e3ef5c72a9ac10ebf8c7a9eb7f71882c97ab0e67b2778191effdb747d9ca54d7c23c2ed19a90
2021-06-14 15:04:32 +02:00
.github doc: Remove label from good first issue template 2020-08-24 09:31:24 +02:00
.tx qt: Bump transifex slug for 22.x 2021-04-21 13:46:41 +02:00
build-aux/m4 build, qt: Fix libraries linking order for Linux hosts 2021-06-06 23:25:07 +03:00
build_msvc Merge bitcoin/bitcoin#22230: build: Fix MSVC linker /SubSystem option for bitcoin-qt.exe 2021-06-14 10:06:55 +08:00
ci Merge bitcoin/bitcoin#21749: test: Bump shellcheck version 2021-05-10 13:49:50 +02:00
contrib Merge bitcoin/bitcoin#22190: Use latest signapple commit 2021-06-11 09:09:26 +08:00
depends build, qt: Fix compiling qt package in depends with GCC 11 2021-06-08 04:16:36 +03:00
doc Merge bitcoin/bitcoin#22172: doc: update tor.md, release notes with removal of tor v2 support 2021-06-12 12:23:17 +02:00
share doc: add maxuploadtarget to bitcoin.conf example 2021-05-28 12:53:17 -04:00
src Merge bitcoin/bitcoin#21261: p2p: update inbound eviction protection for multiple networks, add I2P peers 2021-06-14 15:04:32 +02:00
test Merge bitcoin/bitcoin#22130: test: refactor: dedup utility function chain_transaction() 2021-06-13 18:27:32 +02:00
.appveyor.yml Update msvc and appveyor builds to use Qt5.12.11 binaries. 2021-06-11 16:36:31 +01:00
.cirrus.yml ci: Bump macOS image to big-sur-xcode-12.5 2021-06-02 10:03:38 +02:00
.editorconfig Add EditorConfig file. 2021-02-10 08:00:06 +01:00
.gitattributes Separate protocol versioning from clientversion 2014-10-29 00:24:40 -04:00
.gitignore build: add *~ to .gitignore 2021-05-12 18:10:47 +02:00
.python-version Bump minimum python version to 3.6 2020-11-09 17:53:47 +10:00
.style.yapf test: .style.yapf: Set column_limit=160 2019-03-04 18:28:13 -05:00
autogen.sh scripted-diff: Bump copyright of files changed in 2019 2019-12-30 10:42:20 +13:00
configure.ac Merge bitcoin/bitcoin#21573: Update libsecp256k1 subtree to latest master 2021-06-07 17:05:11 +02:00
CONTRIBUTING.md doc: Fix external links (IRC, ...) 2021-05-31 17:27:57 +02:00
COPYING doc: Update license year range to 2021 2020-12-30 16:24:47 +01:00
INSTALL.md Update INSTALL landing redirection notice for build instructions. 2016-10-06 12:27:23 +13:00
libbitcoinconsensus.pc.in build: remove libcrypto as internal dependency in libbitcoinconsensus.pc 2019-11-19 15:03:44 +01:00
Makefile.am Makefile.am: use APP_DIST_DIR instead of hard-coding dist 2021-05-13 15:41:56 -04:00
README.md doc: Rework internal and external links 2021-02-17 09:18:46 +01:00
REVIEWERS Update REVIEWERS: I've found that I keep track of PRs in need of review without the need for DrahtBot's automated notification :) 2021-06-10 09:00:05 +00:00
SECURITY.md doc: Remove explicit mention of version from SECURITY.md 2019-06-14 06:39:17 -04:00

README.md

Bitcoin Core integration/staging tree

https://bitcoincore.org

For an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/.

Further information about Bitcoin Core is available in the doc folder.

What is Bitcoin?

Bitcoin is an experimental digital currency that enables instant payments to anyone, anywhere in the world. Bitcoin uses peer-to-peer technology to operate with no central authority: managing transactions and issuing money are carried out collectively by the network. Bitcoin Core is the name of open source software which enables the use of this currency.

For more information read the original Bitcoin whitepaper.

License

Bitcoin Core is released under the terms of the MIT license. See COPYING for more information or see https://opensource.org/licenses/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 in configure) with: make check. 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: test/functional/test_runner.py

The CI (Continuous Integration) systems make sure that every pull request is built for Windows, Linux, and macOS, and that unit/sanity tests are run automatically.

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.