dash/test
W. J. van der Laan 3411577473
Merge bitcoin/bitcoin#19160: multiprocess: Add basic spawn and IPC support
84934bf70e11fe4cda1cfda60113a54895d4fdd5 multiprocess: Add echoipc RPC method and test (Russell Yanofsky)
7d76cf667eff512043a28d4407cc89f58796c42b multiprocess: Add comments and documentation (Russell Yanofsky)
ddf7ecc8dfc64cf121099fb047e1ac871de94f4c multiprocess: Add bitcoin-node process spawning support (Russell Yanofsky)
10afdf0280fa93bfffb0a7665c60dc155cd84514 multiprocess: Add Ipc interface implementation (Russell Yanofsky)
745c9cebd50fea1664efef571dc1ee1bddc96102 multiprocess: Add Ipc and Init interface definitions (Russell Yanofsky)
5d62d7f6cd48bbc4e9f37ecc369f38d5e1e0036c Update libmultiprocess library (Russell Yanofsky)

Pull request description:

  This PR is part of the [process separation project](https://github.com/bitcoin/bitcoin/projects/10).

  ---

  This PR adds basic process spawning and IPC method call support to `bitcoin-node` executables built with `--enable-multiprocess`[*].

  These changes are used in https://github.com/bitcoin/bitcoin/pull/10102 to let node, gui, and wallet functionality run in different processes, and extended in https://github.com/bitcoin/bitcoin/pull/19460 and https://github.com/bitcoin/bitcoin/pull/19461 after that to allow gui and wallet processes to be started and stopped independently and connect to the node over a socket.

  These changes can also be used to implement new functionality outside the `bitcoin-node` process like external indexes or pluggable transports (https://github.com/bitcoin/bitcoin/pull/18988). The `Ipc::spawnProcess` and `Ipc::serveProcess` methods added here are entry points for spawning a child process and serving a parent process, and being able to make bidirectional, multithreaded method calls between the processes. A simple example of this is implemented in commit "Add echoipc RPC method and test."

  Changes in this PR aside from the echo test were originally part of #10102, but have been split and moved here for easier review, and so they can be used for other applications like external plugins.

  Additional notes about this PR can be found at https://bitcoincore.reviews/19160

  [*] Note: the `--enable-multiprocess` feature is still experimental, and not enabled by default, and not yet supported on windows. More information can be found in [doc/multiprocess.md](https://github.com/bitcoin/bitcoin/blob/master/doc/multiprocess.md)

ACKs for top commit:
  fjahr:
    re-ACK 84934bf70e11fe4cda1cfda60113a54895d4fdd5
  ariard:
    ACK 84934bf. Changes since last ACK fixes the silent merge conflict about `EnsureAnyNodeContext()`. Rebuilt and checked again debug command `echoipc`.

Tree-SHA512: 52a948b5e18a26d7d7a09b83003eaae9b1ed2981978c36c959fe9a55abf70ae6a627c4ff913a3428be17400a3dace30c58b5057fa75c319662c3be98f19810c6
2024-07-27 13:04:24 +07:00
..
functional Merge bitcoin/bitcoin#19160: multiprocess: Add basic spawn and IPC support 2024-07-27 13:04:24 +07:00
fuzz Merge #21012: ci: Fuzz with integer sanitizer 2024-06-20 12:19:21 +07:00
lint Merge bitcoin/bitcoin#19160: multiprocess: Add basic spawn and IPC support 2024-07-27 13:04:24 +07:00
sanitizer_suppressions Merge #21669: test: Remove spurious double lock tsan suppressions by bumping to clang-12 2024-07-24 20:00:45 +07:00
util merge bitcoin#22633: Replace remaining binascii method calls 2024-07-23 17:45:24 +00:00
config.ini.in merge bitcoin#20458: add is_bdb_compiled helper 2023-02-17 14:21:19 -06:00
get_previous_releases.py fix: follow-up partial bitcoin/bitcoin#25063 - actually load binaries with x86_64-apple-darwin platform 2023-11-24 11:23:46 -06:00
README.md Merge bitcoin/bitcoin#21740: test: add new python linter to check file names and permissions 2024-05-16 02:09:37 +07:00

This directory contains integration tests that test dashd and its utilities in their entirety. It does not contain unit tests, which can be found in /src/test, /src/wallet/test, etc.

This directory contains the following sets of tests:

  • functional which test the functionality of dashd and dash-qt by interacting with them through the RPC and P2P interfaces.
  • util which tests the dash utilities, currently only dash-tx.
  • lint which perform various static analysis checks.

The util tests are run as part of make check target. The functional tests and lint scripts can be run as explained in the sections below.

Running tests locally

Before tests can be run locally, Dash Core must be built. See the building instructions for help.

Functional tests

Dependencies and prerequisites

Many Dash specific tests require dash_hash. To install it:

  • Clone the repo git clone https://github.com/dashpay/dash_hash
  • Install dash_hash cd dash_hash && pip3 install -r requirements.txt .

The ZMQ functional test requires a python ZMQ library. To install it:

  • on Unix, run sudo apt-get install python3-zmq
  • on mac OS, run pip3 install pyzmq

On Windows the PYTHONUTF8 environment variable must be set to 1:

set PYTHONUTF8=1

Running the tests

Individual tests can be run by directly calling the test script, e.g.:

test/functional/wallet_hd.py

or can be run through the test_runner harness, eg:

test/functional/test_runner.py wallet_hd.py

You can run any combination (incl. duplicates) of tests by calling:

test/functional/test_runner.py <testname1> <testname2> <testname3> ...

Wildcard test names can be passed, if the paths are coherent and the test runner is called from a bash shell or similar that does the globbing. For example, to run all the wallet tests:

test/functional/test_runner.py test/functional/wallet*
functional/test_runner.py functional/wallet* (called from the test/ directory)
test_runner.py wallet* (called from the test/functional/ directory)

but not

test/functional/test_runner.py wallet*

Combinations of wildcards can be passed:

test/functional/test_runner.py ./test/functional/tool* test/functional/mempool*
test_runner.py tool* mempool*

Run the regression test suite with:

test/functional/test_runner.py

Run all possible tests with

test/functional/test_runner.py --extended

In order to run backwards compatibility tests, download the previous node binaries:

test/get_previous_releases.py -b v19.3.0 v18.2.2 v0.17.0.3 v0.16.1.1 v0.15.0.0

By default, up to 4 tests will be run in parallel by test_runner. To specify how many jobs to run, append --jobs=n

The individual tests and the test_runner harness have many command-line options. Run test/functional/test_runner.py -h to see them all.

Speed up test runs with a ramdisk

If you have available RAM on your system you can create a ramdisk to use as the cache and tmp directories for the functional tests in order to speed them up. Speed-up amount varies on each system (and according to your ram speed and other variables), but a 2-3x speed-up is not uncommon.

To create a 4GB ramdisk on Linux at /mnt/tmp/:

sudo mkdir -p /mnt/tmp
sudo mount -t tmpfs -o size=4g tmpfs /mnt/tmp/

Configure the size of the ramdisk using the size= option. The size of the ramdisk needed is relative to the number of concurrent jobs the test suite runs. For example running the test suite with --jobs=100 might need a 16GB ramdisk, but running with --jobs=4 will only need a 4GB ramdisk.

To use, run the test suite specifying the ramdisk as the cachedir and tmpdir:

test/functional/test_runner.py --cachedir=/mnt/tmp/cache --tmpdir=/mnt/tmp

Once finished with the tests and the disk, and to free the ram, simply unmount the disk:

sudo umount /mnt/tmp

Troubleshooting and debugging test failures

Resource contention

The P2P and RPC ports used by the dashd nodes-under-test are chosen to make conflicts with other processes unlikely. However, if there is another dashd process running on the system (perhaps from a previous test which hasn't successfully killed all its dashd nodes), then there may be a port conflict which will cause the test to fail. It is recommended that you run the tests on a system where no other dashd processes are running.

On linux, the test framework will warn if there is another dashd process running when the tests are started.

If there are zombie dashd processes after test failure, you can kill them by running the following commands. Note that these commands will kill all dashd processes running on the system, so should not be used if any non-test dashd processes are being run.

killall dashd

or

pkill -9 dashd
Data directory cache

A pre-mined blockchain with 200 blocks is generated the first time a functional test is run and is stored in test/cache. This speeds up test startup times since new blockchains don't need to be generated for each test. However, the cache may get into a bad state, in which case tests will fail. If this happens, remove the cache directory (and make sure dashd processes are stopped as above):

rm -rf test/cache
killall dashd
Test logging

The tests contain logging at five different levels (DEBUG, INFO, WARNING, ERROR and CRITICAL). From within your functional tests you can log to these different levels using the logger included in the test_framework, e.g. self.log.debug(object). By default:

  • when run through the test_runner harness, all logs are written to test_framework.log and no logs are output to the console.
  • when run directly, all logs are written to test_framework.log and INFO level and above are output to the console.
  • when run by our CI (Continuous Integration), no logs are output to the console. However, if a test fails, the test_framework.log and dashd debug.logs will all be dumped to the console to help troubleshooting.

These log files can be located under the test data directory (which is always printed in the first line of test output):

  • <test data directory>/test_framework.log
  • <test data directory>/node<node number>/regtest/debug.log.

The node number identifies the relevant test node, starting from node0, which corresponds to its position in the nodes list of the specific test, e.g. self.nodes[0].

To change the level of logs output to the console, use the -l command line argument.

test_framework.log and dashd debug.logs can be combined into a single aggregate log by running the combine_logs.py script. The output can be plain text, colorized text or html. For example:

test/functional/combine_logs.py -c <test data directory> | less -r

will pipe the colorized logs from the test into less.

Use --tracerpc to trace out all the RPC calls and responses to the console. For some tests (eg any that use submitblock to submit a full block over RPC), this can result in a lot of screen output.

By default, the test data directory will be deleted after a successful run. Use --nocleanup to leave the test data directory intact. The test data directory is never deleted after a failed test.

Attaching a debugger

A python debugger can be attached to tests at any point. Just add the line:

import pdb; pdb.set_trace()

anywhere in the test. You will then be able to inspect variables, as well as call methods that interact with the dashd nodes-under-test.

If further introspection of the dashd instances themselves becomes necessary, this can be accomplished by first setting a pdb breakpoint at an appropriate location, running the test to that point, then using gdb (or lldb on macOS) to attach to the process and debug.

For instance, to attach to self.node[1] during a run you can get the pid of the node within pdb.

(pdb) self.node[1].process.pid

Alternatively, you can find the pid by inspecting the temp folder for the specific test you are running. The path to that folder is printed at the beginning of every test run:

2017-06-27 14:13:56.686000 TestFramework (INFO): Initializing test directory /tmp/user/1000/testo9vsdjo3

Use the path to find the pid file in the temp folder:

cat /tmp/user/1000/testo9vsdjo3/node1/regtest/dashd.pid

Then you can use the pid to start gdb:

gdb /home/example/dashd <pid>

Note: gdb attach step may require ptrace_scope to be modified, or sudo preceding the gdb. See this link for considerations: https://www.kernel.org/doc/Documentation/security/Yama.txt

Often while debugging rpc calls from functional tests, the test might reach timeout before process can return a response. Use --timeout-factor 0 to disable all rpc timeouts for that partcular functional test. Ex: test/functional/wallet_hd.py --timeout-factor 0.

Profiling

An easy way to profile node performance during functional tests is provided for Linux platforms using perf.

Perf will sample the running node and will generate profile data in the node's datadir. The profile data can then be presented using perf report or a graphical tool like hotspot.

To generate a profile during test suite runs, use the --perf flag.

To see render the output to text, run

perf report -i /path/to/datadir/send-big-msgs.perf.data.xxxx --stdio | c++filt | less

For ways to generate more granular profiles, see the README in test/functional.

Util tests

Util tests can be run locally by running test/util/bitcoin-util-test.py. Use the -v option for verbose output.

Lint tests

Dependencies

Lint test Dependency Version used by CI Installation
lint-python.sh flake8 3.8.3 pip3 install flake8==3.8.3
lint-python.sh mypy 0.781 pip3 install mypy==0.781
lint-shell.sh ShellCheck 0.7.2 details...
lint-shell.sh yq default pip3 install yq
lint-spelling.sh codespell 2.0.0 pip3 install codespell==2.0.0

Please be aware that on Linux distributions all dependencies are usually available as packages, but could be outdated.

Running the tests

Individual tests can be run by directly calling the test script, e.g.:

test/lint/lint-files.sh

You can run all the shell-based lint tests by running:

test/lint/lint-all.sh

Writing functional tests

You are encouraged to write functional tests for new or existing features. Further information about the functional test framework and individual tests is found in test/functional.