fb56d37612 p2p: ensure inv is GenMsgTx before ToGenTxid in inv processing (John Newbery)
aa3621385e test: use CInv::MSG_WITNESS_TX flag in p2p_segwit (Jon Atack)
24ee4f01ea p2p: make gtxid(.hash) and fAlreadyHave localvars const (Jon Atack)
b1c855453b p2p: use CInv block message helpers in net_processing.cpp (Jon Atack)
acd6642167 [net processing] Change AlreadyHaveTx() to take a GenTxid (John Newbery)
5fdfb80b86 [net processing] Change AlreadyHaveBlock() to take block_hash argument (John Newbery)
430e183b89 [net processing] Remove mempool argument from AlreadyHaveBlock() (John Newbery)
42ca5618ca [net processing] Split AlreadyHave() into separate block and tx functions (John Newbery)
39f1dc9445 p2p: remove nFetchFlags from NetMsgType TX and INV processing (Jon Atack)
471714e1f0 p2p: add CInv block message helper methods (Jon Atack)
Pull request description:
Building on #19590 and the recent `wtxid` and `GenTxid` changes, this is a refactoring and cleanup PR to simplify and improve some of the net processing code.
Some of the diffs are best reviewed with `-w` to ignore spacing.
Co-authored by John Newbery.
ACKs for top commit:
laanwj:
Code review ACK fb56d37612
jnewbery:
utACK fb56d37612
vasild:
ACK fb56d3761
Tree-SHA512: ba39b58e6aaf850880a842fe5f6295e9f1870906ef690206acfc17140aae2ac854981e1066dbcd4238062478762fbd040ef772fdc2c50eea6869997c583e6a6d
36ec9801a4 test: Add chacha20 test vectors in muhash (Fabian Jahr)
0e2b400fea test: Add basic Python/C++ Muhash implementation parity unit test (Fabian Jahr)
b85543cb73 test: Add Python MuHash3072 implementation to test framework (Pieter Wuille)
ab30cece0e test: Move modinv to util and add unit test (Fabian Jahr)
Pull request description:
This is the second in a [series of pull requests](https://github.com/bitcoin/bitcoin/pull/18000) to implement an Index for UTXO set statistics.
This pull request adds a Python implementation of Muhash3072, a homomorphic hashing algorithm to be used for hashing the UTXO set. The Python implementation can then be used to compare behavior with the C++ version.
ACKs for top commit:
jnewbery:
utACK 36ec9801a
laanwj:
Code review ACK 36ec9801a4
Tree-SHA512: a3519c6e11031174f1ae71ecd8bcc7f3be42d7fc9c84c77f2fbea7cfc5ad54fcbe10b55116ad8d9a52ac5d675640eefed3bf260c58a02f2bf3bc0d8ec208baa6
This maintains a persistent list of wallets stored in settings that will
automatically be loaded on startup. Being able to load a wallet automatically
on startup will be more useful in the GUI when the option to create wallets is
added in #15006, but it's reasonable to expose this feature by RPC as well.
f5c003d3ea [test] Add test for NODE_COMPACT_FILTER. (Jim Posen)
132b30d9c8 [net] Signal NODE_COMPACT_FILTERS if we're serving compact filters. (Jim Posen)
b3fbc94d4f Apply cfilters review fixups (John Newbery)
Pull request description:
If -peerblockfilters is configured, signal the `NODE_COMPACT_FILTERS` service bit to indicate that we are able to serve compact block filters, headers and checkpoints.
ACKs for top commit:
MarcoFalke:
re-review and Concept ACK f5c003d3ea
fjahr:
Code review ACK f5c003d3ea
clarkmoody:
Concept ACK f5c003d3ea
ariard:
Concept and Code Review ACK f5c003d
jonatack:
ACK f5c003d3e
Tree-SHA512: 34d1c153530a0e55d09046fe548c9dc37344b5d6d50e00af1b4e1de1e7b49de770fca8471346a17c151de9fe164776296bb3dd5af331977f0c3ef1e6fc906f85
dac7a111bd refactor: test: use _ variable for unused loop counters (Sebastian Falbesoner)
Pull request description:
This tiny PR substitutes Python loops in the form of `for x in range(N): ...` by `for _ in range(N): ...` where applicable. The idea is indicating to the reader that a block (or statement, in list comprehensions) is just repeated N times, and that the loop counter is not used in the body, hence using the throwaway variable. This is already done quite often in the current tests (see e.g. `$ git grep "for _ in range("`). Another alternative would be using `itertools.repeat` (according to Python core developer Raymond Hettinger it's [even faster](https://twitter.com/raymondh/status/1144527183341375488)), but that doesn't seem to be widespread in use and I'm not sure about a readability increase.
The only drawback I see is that whenever one wants to debug loop iterations, one would need to introduce a loop variable again. Reviewing this is basically a no-brainer, since tests would fail immediately if a a substitution has taken place on a loop where the variable is used.
Instances to replace were found by `$ git grep "for.*in range("` and manually checked.
ACKs for top commit:
darosior:
ACK dac7a111bd
instagibbs:
manual inspection ACK dac7a111bd
practicalswift:
ACK dac7a111bd -- the updated code is easier to reason about since the throwaway nature of a variable is expressed explicitly (using the Pythonic `_` idiom) instead of implicitly. Explicit is better than implicit was we all know by now :)
Tree-SHA512: 5f43ded9ce14e5e00b3876ec445b90acda1842f813149ae7bafa93f3ac3d510bb778e2c701187fd2c73585e6b87797bb2d2987139bd1a9ba7d58775a59392406
fa4dfd215f test: Wait until is_connected in add_p2p_connection (MarcoFalke)
Pull request description:
Moving the wait_until from the individual test scripts to the test framework simplifies two tests
ACKs for top commit:
jnewbery:
Code review ACK fa4dfd215f
theStack:
ACK fa4dfd215f☕
Tree-SHA512: 36eda7eb323614a4c4f9215f1d7b40b9f9c4036d1c08eb701ea705f3e2986fdabd2fc558965a6aadabeed861034aeaeef3c00f968ca17ed7a27e42e506cda87d
substitutes "for x in range(N):" by "for _ in range(N):"
indicates to the reader that a block is just repeated N times, and
that the loop counter is not used in the body
82fc4017b7 test: Catch decimal.InvalidOperation from TestNodeCLI#send_cli (Ben Woosley)
Pull request description:
`decimal.InvalidOperation` is a special case of a float parsing error, which
presumably should be handled in the same way as a general parsing error,
rather than blow up.
Alternatives include: logging the error, or re-raising with more information.
Example log output:
```
File "/home/travis/build/bitcoin/bitcoin/ci/scratch/build/bitcoin-i686-pc-linux-gnu/test/functional/test_framework/test_framework.py", line 603, in sync_all
self.sync_blocks(nodes)
File "/home/travis/build/bitcoin/bitcoin/ci/scratch/build/bitcoin-i686-pc-linux-gnu/test/functional/test_framework/test_framework.py", line 568, in sync_blocks
best_hash = [x.getbestblockhash() for x in rpc_connections]
File "/home/travis/build/bitcoin/bitcoin/ci/scratch/build/bitcoin-i686-pc-linux-gnu/test/functional/test_framework/test_framework.py", line 568, in <listcomp>
best_hash = [x.getbestblockhash() for x in rpc_connections]
File "/home/travis/build/bitcoin/bitcoin/ci/scratch/build/bitcoin-i686-pc-linux-gnu/test/functional/test_framework/test_node.py", line 571, in __call__
return self.cli.send_cli(self.command, *args, **kwargs)
File "/home/travis/build/bitcoin/bitcoin/ci/scratch/build/bitcoin-i686-pc-linux-gnu/test/functional/test_framework/test_node.py", line 639, in send_cli
return json.loads(cli_stdout, parse_float=decimal.Decimal)
File "/usr/lib64/python3.6/json/__init__.py", line 367, in loads
return cls(**kw).decode(s)
File "/usr/lib64/python3.6/json/decoder.py", line 339, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib64/python3.6/json/decoder.py", line 355, in raw_decode
obj, end = self.scan_once(s, idx)
decimal.InvalidOperation: [<class 'decimal.InvalidOperation'>]
```
See: https://travis-ci.org/github/bitcoin/bitcoin/jobs/713502326
ACKs for top commit:
laanwj:
ACK 82fc4017b7
Tree-SHA512: 8c102b8bf831b05c5ca4b2e1feb5574dcbaed8cab0b2f22b013c5dfcb81788a38839a163dd1e2c6470ccbe5874214663b84485f45467738fd850ca38d539ae25
faa9a74c9e test: Fail wait_until early if connection is lost (MarcoFalke)
Pull request description:
Calling `minonode.wait_until` needs a connection to make progress (e.g. waiting for an inv), unless the mininode waits for the initial connection or for a disconnection. So for test development and failure debugging, fail early in all `wait_until`, unless opted out.
ACKs for top commit:
jnewbery:
Code review ACK faa9a74c9e.
Tree-SHA512: 4be850b96e23b87bc2ff42c028a5045d6f5cdbc9482ce6a6ba01cc5eb26710dab9e2ed547c363aac4bd5825151ee9996fb797261420b631bceeddbfa698d1dec
decimal.InvalidOperation is a special case of a float parsing error, which
presumably should be handled in the same way as a general parsing error,
rather than blow up.
Alternatives include: logging the error, or re-raising with more information.
Example log output:
File "/home/travis/build/bitcoin/bitcoin/ci/scratch/build/bitcoin-i686-pc-linux-gnu/test/functional/test_framework/test_framework.py", line 603, in sync_all
self.sync_blocks(nodes)
File "/home/travis/build/bitcoin/bitcoin/ci/scratch/build/bitcoin-i686-pc-linux-gnu/test/functional/test_framework/test_framework.py", line 568, in sync_blocks
best_hash = [x.getbestblockhash() for x in rpc_connections]
File "/home/travis/build/bitcoin/bitcoin/ci/scratch/build/bitcoin-i686-pc-linux-gnu/test/functional/test_framework/test_framework.py", line 568, in <listcomp>
best_hash = [x.getbestblockhash() for x in rpc_connections]
File "/home/travis/build/bitcoin/bitcoin/ci/scratch/build/bitcoin-i686-pc-linux-gnu/test/functional/test_framework/test_node.py", line 571, in __call__
return self.cli.send_cli(self.command, *args, **kwargs)
File "/home/travis/build/bitcoin/bitcoin/ci/scratch/build/bitcoin-i686-pc-linux-gnu/test/functional/test_framework/test_node.py", line 639, in send_cli
return json.loads(cli_stdout, parse_float=decimal.Decimal)
File "/usr/lib64/python3.6/json/__init__.py", line 367, in loads
return cls(**kw).decode(s)
File "/usr/lib64/python3.6/json/decoder.py", line 339, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib64/python3.6/json/decoder.py", line 355, in raw_decode
obj, end = self.scan_once(s, idx)
decimal.InvalidOperation: [<class 'decimal.InvalidOperation'>]
This commit clarifies the intended usage of message_count and
last_message. Additionally it changes the only usage of message_count
to using last_message instead, bringing the code further along the
intended usage.
0a4f1422cd Further improve comments around recentRejects (Suhas Daftuar)
0e20cfedb7 Disconnect peers sending wtxidrelay message after VERACK (Suhas Daftuar)
cacd85209e test: Use wtxid relay generally in functional tests (Fabian Jahr)
8d8099e97a test: Add tests for wtxid tx relay in segwit test (Fabian Jahr)
9a5392fdf6 test: Update test framework p2p protocol version to 70016 (Fabian Jahr)
dd78d1d641 Rename AddInventoryKnown() to AddKnownTx() (Suhas Daftuar)
4eb515574e Make TX_WITNESS_STRIPPED its own rejection reason (Suhas Daftuar)
97141ca442 Delay getdata requests from peers using txid-based relay (Suhas Daftuar)
46d78d47de Add p2p message "wtxidrelay" (Suhas Daftuar)
2d282e0cba ignore non-wtxidrelay compliant invs (Anthony Towns)
ac88e2eb61 Add support for tx-relay via wtxid (Suhas Daftuar)
8e68fc246d Add wtxids to recentRejects instead of txids (Suhas Daftuar)
144c385820 Add wtxids of confirmed transactions to bloom filter (Suhas Daftuar)
85c78d54af Add wtxid-index to orphan map (Suhas Daftuar)
08b39955ec Add a wtxid-index to mapRelay (Suhas Daftuar)
60f0acda71 Just pass a hash to AddInventoryKnown (Suhas Daftuar)
c7eb6b4f1f Add wtxid to mempool unbroadcast tracking (Amiti Uttarwar)
2b4b90aa8f Add a wtxid-index to the mempool (Suhas Daftuar)
Pull request description:
Using txids (a transaction's hash, without witness) for transaction relay is problematic, post-segwit -- if a peer gives us a segwit transaction that fails policy checks, it could be because the txid associated with the transaction is definitely unacceptable to our node (regardless of the witness), or it could be that the transaction was malleated and with a different witness, the txid could be accepted to our mempool.
We have a bloom filter of recently rejected transactions, whose purpose is to help us avoid redownloading and revalidating transactions that fail to be accepted, but because of this potential for witness malleability to interfere with relay of valid transactions, we do not use the filter for segwit transactions. This issue is discussed at some length in #8279. The effect of this is that whenever a segwit transaction that fails policy checks is relayed, a node would download that transaction from every peer announcing it, because it has no way presently to cache failure. Historically this hasn't been a big problem, but if/when policy for accepting segwit transactions were to change (eg taproot, or any other change), we could expect older nodes talking to newer nodes to be wasting bandwidth because of this.
As discussed in that issue, switching to wtxid-based relay solves this problem -- by using an identifier for a transaction that commits to all the data in our relay protocol, we can be certain if a transaction that a peer is announcing is one that we've already tried to process, or if it's something new. This PR introduces support for wtxid-based relay with peers that support it (and remains backwards compatible with peers that use txids for relay, of course).
Apart from code correctness, one issue to be aware of is that by downloading from old and new peers alike, we should expect there to be some bandwidth wasted, because sometimes we might download the same transaction via txid-relay as well as wtxid-relay. The last commit in this PR implements a heuristic I want to analyze, which is to just delay relay from txid-relay peers by 2 seconds, if we have at least 1 wtxid-based peer. I've just started running a couple nodes with this heuristic so I can measure how well it works, but I'm open to other ideas for minimizing that issue. In the long run, I think this will be essentially a non-issue, so I don't think it's too big a concern, we just need to bite the bullet and deal with it during upgrade.
Finally, this proposal would need a simple BIP describing the changes, which I haven't yet drafted. However, review and testing of this code in the interim would be welcome.
To do items:
- [x] Write BIP explaining the spec here (1 new p2p message for negotiating wtxid-based relay, along with a new INV type)
- [ ] Measure and evaluate a heuristic for minimizing how often a node downloads the same transaction twice, when connected to old and new nodes.
ACKs for top commit:
naumenkogs:
utACK 0a4f1422cd
laanwj:
utACK 0a4f1422cd
Tree-SHA512: d8eb8f0688cf0cbe9507bf738e143edab1f595551fdfeddc2b6734686ea26e7f156b6bfde38bad8bbbe8bec1857c7223e1687f8f018de7463dde8ecaa8f450df
3a7e79478a test: retry when write to a socket fails on macOS (Ivan Metlushko)
8cf9d15b82 test: use pgrep for better compatibility (Ivan Metlushko)
Pull request description:
Rationale: a few minor changes to make experience of running tests on macOS a bit better
1.`pidof` is not available on BSD/macOS, while `pgrep` is present on BSD, Linux and macOS
2. Add retry as a workaround for a weird behavior when writing to a socket (https://bugs.python.org/issue33450). Stacktrace attached
Man pages:
https://www.freebsd.org/cgi/man.cgi?query=pgrep&apropos=0&sektion=1&manpath=FreeBSD+6.0-RELEASE&arch=default&format=htmlhttps://man7.org/linux/man-pages/man1/pgrep.1.html
Related to #19281
Stacktrace example:
```
...
33/161 - feature_abortnode.py failed, Duration: 63 s
stdout:
2020-06-11T10:46:43.947000Z TestFramework (INFO): Initializing test directory /var/folders/2q/d5w9zh614r7g5c8r74ln3g400000gq/T/test_runner_₿_🏃_20200611_174102/feature_abortnode_128
2020-06-11T10:46:45.199000Z TestFramework (INFO): Waiting for crash
2020-06-11T10:47:15.921000Z TestFramework (INFO): Node crashed - now verifying restart fails
2020-06-11T10:47:47.068000Z TestFramework (INFO): Stopping nodes
[node 1] Cleaning up leftover process
stderr:
Traceback (most recent call last):
File "/Users/xxx/Projects/bitcoin/test/functional/feature_abortnode.py", line 50, in <module>
AbortNodeTest().main()
File "/Users/xxx/Projects/bitcoin/test/functional/test_framework/test_framework.py", line 142, in main
exit_code = self.shutdown()
File "/Users/xxx/Projects/bitcoin/test/functional/test_framework/test_framework.py", line 266, in shutdown
self.stop_nodes()
File "/Users/xxx/Projects/bitcoin/test/functional/test_framework/test_framework.py", line 515, in stop_nodes
node.stop_node(wait=wait)
File "/Users/xxx/Projects/bitcoin/test/functional/test_framework/test_node.py", line 318, in stop_node
self.stop(wait=wait)
File "/Users/xxx/Projects/bitcoin/test/functional/test_framework/coverage.py", line 47, in __call__
return_val = self.auth_service_proxy_instance.__call__(*args, **kwargs)
File "/Users/xxx/Projects/bitcoin/test/functional/test_framework/authproxy.py", line 142, in __call__
response, status = self._request('POST', self.__url.path, postdata.encode('utf-8'))
File "/Users/xxx/Projects/bitcoin/test/functional/test_framework/authproxy.py", line 107, in _request
self.__conn.request(method, path, postdata, headers)
File "/Users/xxx/.pyenv/versions/3.5.6/lib/python3.5/http/client.py", line 1107, in request
self._send_request(method, url, body, headers)
File "/Users/xxx/.pyenv/versions/3.5.6/lib/python3.5/http/client.py", line 1152, in _send_request
self.endheaders(body)
File "/Users/xxx/.pyenv/versions/3.5.6/lib/python3.5/http/client.py", line 1103, in endheaders
self._send_output(message_body)
File "/Users/xxx/.pyenv/versions/3.5.6/lib/python3.5/http/client.py", line 936, in _send_output
self.send(message_body)
File "/Users/xxx/.pyenv/versions/3.5.6/lib/python3.5/http/client.py", line 908, in send
self.sock.sendall(data)
OSError: [Errno 41] Protocol wrong type for socket
```
ACKs for top commit:
laanwj:
ACK 3a7e79478a
Tree-SHA512: fefbe40ce94ab29f18bbbed2a434194b1384ffa5279b1d04db7a3708e3dd422bd9e450f1db3f95a1a851fac5a626ab533c6ebcfd7ede96f8ccae9e6f3e9fff92
If the socket is tearing down macOS will return EPROTOTYPE instead of EPIPE.
Because python doesn't handle this internally we have to do a workaround and retry the request.
See https://bugs.python.org/issue33450
56010f9256 test: hoist p2p values to test framework constants (Jon Atack)
75447f0893 test: improve msg sends and p2p disconnections in p2p_invalid_messages (Jon Atack)
57960192a5 test: refactor test_large_inv() into 3 tests with common method (Jon Atack)
e2b21d8a59 test: add p2p_invalid_messages logging (Jon Atack)
9fa494dc09 net: update misbehavior logging for oversized messages (Jon Atack)
Pull request description:
...seen while reviewing #19264, #19252, #19304 and #19107:
in `net_processing.cpp`
- make the debug logging for oversized message size misbehavior the same for `addr`, `getdata`, `headers` and `inv` messages
in `p2p_invalid_messages`
- add missing logging
- improve assertions/message sends, move cleanup disconnections outside the assertion scopes
- split a slowish 3-part test into 3 order-independent tests
- add a few p2p constants to the test framework
ACKs for top commit:
troygiorshev:
reACK 56010f9256
MarcoFalke:
ACK 56010f9256 🎛
Tree-SHA512: db67b70278f8d4c318907e105af54b54eb3afd15500f9aa0c98034f6fd4bd1cf9ad1663037bd9b237ff4890f3059b37291a6498d8d6ae2cc38efb9f045f73310
cc84460c16 test: move sync_blocks and sync_mempool functions to test_framework.py (Roy Shao)
Pull request description:
This PR moves `sync_blocks` and `sync_mempool` out from `test_framework/util.py` to `test_framework/test_framework.py` so they can take contextual information of test framework into account.
* Change all reference callers to call functions from `test_framework.py`
* Remove `**kwargs` which is not used
* Take into account of `timeout_factor` when respecting timeout in function implementations.
* Pass all tests by running `./test/functional/test_runner.py`
fixes#18930
ACKs for top commit:
MarcoFalke:
ACK cc84460c16 , reviewed with --color-moved=dimmed-zebra --color-moved-ws=ignore-all-space 💫
Tree-SHA512: a79b2a3fa842fc26a7aacb834bb2aea88b3049916c0b754e60002a77ce94bb5954e0ea3b436bf268e9295efb62d721dfef263a09339a55c684ac3fda388c275e
9a40cfc558 [refactor] use waiting inside disconnect_p2ps (gzhao408)
aeb9fb414e [test] wait for disconnect_p2ps to be reflected in getpeerinfo (gzhao408)
e81942d2e1 [test] logging and style followups for bloomfilter tests (gzhao408)
Pull request description:
Followup to #19083 which adds bloomfilter-related tests.
1. Make test_node `disconnect_p2ps` wait until disconnection is complete to avoid race conditions (and not place the burden on tests) from MarcoFalke's [comment](https://github.com/bitcoin/bitcoin/pull/19083#discussion_r437383989). And clean up any redundant `wait_until`s in the functional tests.
2. Clean up style + logging in p2p_filter.py and p2p_nobloomfilter_messages.py and jonatack's other [comments](https://github.com/bitcoin/bitcoin/pull/19083#pullrequestreview-428955784)
ACKs for top commit:
jonatack:
Code review ACK 9a40cfc from re-reviewing the diff and `git range-diff 5cafb46 8386ad5 9a40cfc`
MarcoFalke:
ACK 9a40cfc558🐂
Tree-SHA512: 2e14b1c12fc08a355bd5ccad7a2a734a4ccda4bc7dc7bac171cb57359819fc1599d764290729af74832fac3e2be258c5d406c701e78ab6d7262835859b9a7d87
-Waiting is important to avoid race conditions,
especially if testing peer info through rpc later.
-Wait for mininodes to be disconnected only, even
though it's more complex, because we may still want
to be connected to test nodes.
62068381a3 [tests] Make mininode_lock non-reentrant (John Newbery)
c67c1f2c03 [tests] Don't call super twice in P2PTxInvStore.on_inv() (John Newbery)
9d80762fa0 [tests] Don't acquire mininode_lock twice in wait_for_broadcast() (John Newbery)
edae6075aa [tests] Only acquire lock once in p2p_compactblocks.py (John Newbery)
Pull request description:
There's no need for mininode_lock to be reentrant.
Use a simpler non-recursive lock.
ACKs for top commit:
MarcoFalke:
ACK 62068381a3😃
jonatack:
ACK 62068381a3
Tree-SHA512: dcbc19e6c986970051705789be0ff7bec70c69cf76d5b468c2ba4cb732883ad512b1de5c3206c2eca41fa3f1c4806999df4cabbf67fc3c463bb817458e59a19c
34e641a564 test: Remove unnecessary disconnect_nodes call in rpc_psbt.py (Danny Lee)
e6e7abd51a test: remove redundant two-way disconnect_nodes calls (Danny Lee)
a9bd1f9adf test: warn if nodes not connected before disconnect_nodes (Danny Lee)
Pull request description:
There's no harm in calling `disconnect_nodes` for nodes that weren't connected (in this case it's a no-op). However, detecting this case and logging a warning can help ensure that tests are behaving as expected.
In addition, since `disconnect_nodes` works bidirectionally, I removed all instances of this pattern:
```
disconnect_nodes(self.nodes[0], 1)
disconnect_nodes(self.nodes[1], 0)
```
ACKs for top commit:
MarcoFalke:
review ACK 34e641a564👔
amitiuttarwar:
ACK 34e641a564. Thanks for this test improvement!
Tree-SHA512: 344855ceb46c012d43c13d7c09f44d32dcb7645706d10ae1e4645d9edca54c6c6c13fee26b79480755cdfcdf39b4b5770b36bb03ce71ba002d5be8a27fe008af
7daffc6a90 [test] CScriptNum Decode Check as Unit Tests (Gillian Chu)
Pull request description:
The CScriptNum test (#14816) is a roundtrip test of the test framework. Thus, it would be better suited as a unit test. This is now possible with the introduction of the unit test module for the functional tests. See #18576.
This PR:
1. Refactors the CScriptNum tests into 2 unit tests, one in script.py and one in blocktools.py.
2. Extends the script.py CScriptNum test to trial larger numbers.
ACKs for top commit:
laanwj:
ACK 7daffc6a90
Tree-SHA512: 17a04a4bfff1b1817bfc167824c679455d9e06e6e0164c00a7e44f8aa5041c5f5080adcc1452fd80ba1a6d8409f976c982bc481d686c434edf97a5893a32a436
Migrates the CScriptNum decode tests into a unit test, and moved some
changes made in #14816. Made possible by the integration of
test_framework unit testing in #18576. Further extends the original
test with larger ints, similar to the scriptnum_tests.cpp file. Adds
test to blocktools.py testing fn create_coinbase() with CScriptNum
decode.
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/
