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Support for type hints was introduced in Python 3.5. Type hints make it easier to read and review code in my opinion. Also an IDE may discover a potential bug sooner. Yet, as PEP 484 says: "It should also be emphasized that Python will remain a dynamically typed language, and the authors have no desire to ever make type hints mandatory, even by convention."
Mypy is used in lint-python.sh to do the type checking. The package is standard so there is little chance that it will be abandoned. Mypy checks that type hints in source code are correct when they are not, it fails with an error.
Useful resources:
* https://docs.python.org/3.5/library/typing.html
* https://www.python.org/dev/peps/pep-0484/
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3ed772d2219e58d6afea3d12c0ebebb8487445e7 [tests] remove bignum.py (John Newbery)
f950ec25201e8ff7948be99ce3171f9700c4a8dc [tests] remove bn2bin() (John Newbery)
3b9b38579c59d5b31bd75103618776eafc05c132 [tests] remove bn_bytes() function (John Newbery)
a760aa14a974cc18fa70a91f87a96a3db395a624 [tests] remove mpi2vch() function (John Newbery)
9a60bef50def228da763fe842bc2a7b9bf4fbcd7 [tests] don't encode the integer size in bignum (John Newbery)
1dc68aee66795bd806675913dc0401420383b9d1 [tests] add function comments to bignum (John Newbery)
f31fc0e92efae793af840c9a46e765c20e0899b4 [tests] fix flake8 warnings in script.py and bignum.py (John Newbery)
Pull request description:
Only one function is imported in script.py. Just move that function to script.py and remove the bignum.py module.
Remove unused functionality and fix some flake8 warnings along the way.
Top commit has no ACKs.
Tree-SHA512: 015f543ab545b5d5451896e2751d9c19334d9155b03faacd2023781e89833a2440f7f28741e9a8ac49badd9cdc012cbb6e038cdcdebeefaf9cb9d461c0689157
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It only contains one function and is only imported by one
other module (script.py). Just move the function to
script.py.
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13782b8ba8 docs: add perf section to developer docs (James O'Beirne)
58180b5fd4 tests: add utility to easily profile node performance with perf (James O'Beirne)
Pull request description:
Adds a context manager to easily (and selectively) profile node performance during functional test execution using `perf`.
While writing some tests, I encountered some odd bitcoind slowness. I wrote up a utility (`TestNode.profile_with_perf`) that generates performance diagnostics for a node by running `perf` during the execution of a particular region of test code.
`perf` usage is detailed in the excellent (and sadly unmerged) https://github.com/bitcoin/bitcoin/pull/12649; all due props to @eklitzke.
### Example
```python
with node.profile_with_perf("large-msgs"):
for i in range(200):
node.p2p.send_message(some_large_msg)
node.p2p.sync_with_ping()
```
This generates a perf data file in the test node's datadir (`/tmp/testtxmpod0y/node0/node-0-TestName-large-msgs.perf.data`).
Running `perf report` generates nice output about where the node spent most of its time while running that part of the test:
```bash
$ perf report -i /tmp/testtxmpod0y/node0/node-0-TestName-large-msgs.perf.data --stdio \
| c++filt \
| less
# To display the perf.data header info, please use --header/--header-only options.
#
#
# Total Lost Samples: 0
#
# Samples: 135 of event 'cycles:pp'
# Event count (approx.): 1458205679493582
#
# Children Self Command Shared Object Symbol
# ........ ........ ............... ................... ........................................................................................................................................................................................................................................................................
#
70.14% 0.00% bitcoin-net bitcoind [.] CNode::ReceiveMsgBytes(char const*, unsigned int, bool&)
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---CNode::ReceiveMsgBytes(char const*, unsigned int, bool&)
70.14% 0.00% bitcoin-net bitcoind [.] CNetMessage::readData(char const*, unsigned int)
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---CNetMessage::readData(char const*, unsigned int)
CNode::ReceiveMsgBytes(char const*, unsigned int, bool&)
35.52% 0.00% bitcoin-net bitcoind [.] std::vector<char, zero_after_free_allocator<char> >::_M_fill_insert(__gnu_cxx::__normal_iterator<char*, std::vector<char, zero_after_free_allocator<char> > >, unsigned long, char const&)
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---std::vector<char, zero_after_free_allocator<char> >::_M_fill_insert(__gnu_cxx::__normal_iterator<char*, std::vector<char, zero_after_free_allocator<char> > >, unsigned long, char const&)
CNetMessage::readData(char const*, unsigned int)
CNode::ReceiveMsgBytes(char const*, unsigned int, bool&)
...
```
Tree-SHA512: 9ac4ceaa88818d5eca00994e8e3c8ad42ae019550d6583972a0a4f7b0c4f61032e3d0c476b4ae58756bc5eb8f8015a19a7fc26c095bd588f31d49a37ed0c6b3e
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Introduces `TestNode.profile_with_perf()` context manager which
samples node execution to produce profiling data.
Also introduces a test framework flag, `--perf`, which will run
perf on all nodes for the duration of a given test.
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Per @jimmysong's suggestion in bitcoin/bitcoin#14305. Also corrects
module for network objects and wrappers.
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5fecd84 [tests] Remove redundant import in blocktools.py test (Anthony Towns)
9b20bb4 [tests] Check tests conform to naming convention (Anthony Towns)
7250b4e [tests] README.md nit fixes (Anthony Towns)
82b2712 [tests] move witness util functions to blocktools.py (John Newbery)
1e10854 [tests] [docs] update README for new test naming scheme (John Newbery)
Pull request description:
Splitting #11774 into two parts -- this part updates the README with the proposed naming convention, and adds some checks to test_runner.py that the number of tests violating the naming convention doesn't increase too much. Idea is this part of the change should not introduce merge conflicts or require much rebasing, so reviews of the complicated bits won't become invalidated too often; while the second part will just be file renames, which will require regular rebasing and will introduce merge conflicts with pending PRs, but can be merged later, and should also be much easier to review, since it will only include relatively trivial changes.
Tree-SHA512: b96557d41714addbbfe2aed62fb5a48639eaeb1eb3aba30ac1b3a86bb3cb8d796c6247f9c414c4695c4bf54c0ec9968ac88e2f88fb62483bc1a2f89368f7fc80
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NodeConn -> P2PConnection
NodeConnCB -> P2PInterface
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Almost all test scripts currently need to override the __init__()
method. When they do that they need to call into super().__init__() as
the base class does some generic initialization.
This commit makes the base class __init__() call into set_test_params()
method. Individual test cases can override set_test_params() to setup
their test parameters.
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English grammar dictates that these bullet points should be capitalized.
This also makes the capitalization style consistent with the rest of the
document, e.g. the "Decision Making Process" section.
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maxblocksinflight tested that a node would not send get_data messages
for more than 16 new blocks at the same time. bitcoin core no longer
responds to block invs with get_data, since it does headers-first
sync'ing. This test was therefore testing nothing and can be removed.
the sendheaders test script tests that bitcoin will not send get_headers
for more than 16 blocks simultaneously.
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