9a92452a5c
bff7c66e67aa2f18ef70139338643656a54444fe Add documentation to contrib folder (Troy Giorshev) 381f77be858d7417209b6de0b7cd23cb7eb99261 Add Message Capture Test (Troy Giorshev) e4f378a505922c0f544b4cfbfdb169e884e02be9 Add capture parser (Troy Giorshev) 4d1a582549bc982d55e24585b0ba06f92f21e9da Call CaptureMessage at appropriate locations (Troy Giorshev) f2a77ff97bec09dd5fcc043d8659d8ec5dfb87c2 Add CaptureMessage (Troy Giorshev) dbf779d5deb04f55c6e8493ce4e12ed4628638f3 Clean PushMessage and ProcessMessages (Troy Giorshev) Pull request description: This PR introduces per-peer message capture into Bitcoin Core. 📓 ## Purpose The purpose and scope of this feature is intentionally limited. It answers a question anyone new to Bitcoin's P2P protocol has had: "Can I see what messages my node is sending and receiving?". ## Functionality When a new debug-only command line argument `capturemessages` is set, any message that the node receives or sends is captured. The capture occurs in the MessageHandler thread. When receiving a message, it is captured as soon as the MessageHandler thread takes the message off of the vProcessMsg queue. When sending, the message is captured just before the message is pushed onto the vSendMsg queue. The message capture is as minimal as possible to reduce the performance impact on the node. Messages are captured to a new `message_capture` folder in the datadir. Each node has their own subfolder named with their IP address and port. Inside, received and sent messages are captured into two binary files, msgs_recv.dat and msgs_sent.dat, like so: ``` message_capture/203.0.113.7:56072/msgs_recv.dat message_capture/203.0.113.7:56072/msgs_sent.dat ``` Because the messages are raw binary dumps, included in this PR is a Python parsing tool to convert the binary files into human-readable JSON. This script has been placed on its own and out of the way in the new `contrib/message-capture` folder. Its usage is simple and easily discovered by the autogenerated `-h` option. ## Future Maintenance I sympathize greatly with anyone who says "the best code is no code". The future maintenance of this feature will be minimal. The logic to deserialize the payload of the p2p messages exists in our testing framework. As long as our testing framework works, so will this tool. Additionally, I hope that the simplicity of this tool will mean that it gets used frequently, so that problems will be discovered and solved when they are small. ## FAQ "Why not just use Wireshark" Yes, Wireshark has the ability to filter and decode Bitcoin messages. However, the purpose of the message capture added in this PR is to assist with debugging, primarily for new developers looking to improve their knowledge of the Bitcoin Protocol. This drives the design in a different direction than Wireshark, in two different ways. First, this tool must be convenient and simple to use. Using an external tool, like Wireshark, requires setup and interpretation of the results. To a new user who doesn't necessarily know what to expect, this is unnecessary difficulty. This tool, on the other hand, "just works". Turn on the command line flag, run your node, run the script, read the JSON. Second, because this tool is being used for debugging, we want it to be as close to the true behavior of the node as possible. A lot can happen in the SocketHandler thread that would be missed by Wireshark. Additionally, if we are to use Wireshark, we are at the mercy of whoever it maintaining the protocol in Wireshark, both as to it being accurate and recent. As can be seen by the **many** previous attempts to include Bitcoin in Wireshark (google "bitcoin dissector") this is easier said than done. Lastly, I truly believe that this tool will be used significantly more by being included in the codebase. It's just that much more discoverable. ACKs for top commit: MarcoFalke: re-ACK bff7c66e67aa2f18ef70139338643656a54444fe only some minor changes: 👚 jnewbery: utACK bff7c66e67aa2f18ef70139338643656a54444fe theStack: re-ACK bff7c66e67aa2f18ef70139338643656a54444fe Tree-SHA512: e59e3160422269221f70f98720b47842775781c247c064071d546c24fa7a35a0e5534e8baa4b4591a750d7eb16de6b4ecf54cbee6d193b261f4f104e28c15f47 |
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| .cirrus.yml | ||
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| configure.ac | ||
| CONTRIBUTING.md | ||
| COPYING | ||
| INSTALL.md | ||
| libdashconsensus.pc.in | ||
| Makefile.am | ||
| README.md | ||
| SECURITY.md | ||
Dash Core staging tree
| CI | master | develop |
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| Gitlab |  |
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For an immediately usable, binary version of the Dash Core software, see https://www.dash.org/downloads/.
Further information about Dash Core is available in the doc folder.
What is Dash?
Dash is an experimental digital currency that enables instant, private payments to anyone, anywhere in the world. Dash uses peer-to-peer technology to operate with no central authority: managing transactions and issuing money are carried out collectively by the network. Dash Core is the name of the open source software which enables the use of this currency.
For more information read the original Dash whitepaper.
License
Dash 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 meant to be stable. Development is normally done in separate branches.
Tags are created to indicate new official,
stable release versions of Dash Core.
The develop branch is regularly built (see doc/build-*.md for instructions) and tested, but is not guaranteed to be
completely stable.
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 Travis CI system makes 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 Dash 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.