Replaces legacy wallet operations with MiniWallet in rpc_getblockstats.py and simplifies the test structure.
The test used legacy wallet RPCs and had a complex generate/load pattern that dumped data to JSON files. MiniWallet provides deterministic transaction creation, eliminating the need for file I/O and pre-generated data. This creates a single code path that works in all environments.
Fixes #31838
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For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/33184.
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getblockstats RPC UTXO overhead estimation by l0rinc)If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.
79+ self.generate(wallet, COINBASE_MATURITY + 1)
80+
81+ external_address = self.nodes[0].get_deterministic_priv_key().address
82+ external_script = address_to_scriptpubkey(external_address)
83+
84+ for i, (amount_btc, description) in enumerate(TRANSACTIONS):
0 for i, (amount_btc, _) in enumerate(TRANSACTIONS):
62- self.nodes[0].settxfee(amount=0.003)
63- self.nodes[0].sendtoaddress(address=address, amount=1, subtractfeefromamount=True)
64- # Send to OP_RETURN output to test its exclusion from statistics
65- self.nodes[0].send(outputs={"data": "21"})
66+ MOCKTIME = 1525107225
67+ FEE_SATOSHIS = 31200
FEE_SATOSHIS? Couldn’t we use the default value from send_to?
107+ with open(filename, 'w', encoding="utf8") as f:
108+ json.dump(to_dump, f, sort_keys=True, indent=2)
109+
110+ def _create_op_return_transaction(self, wallet):
111+ """Create a transaction with OP_RETURN output to test statistics exclusion."""
112+ tx = wallet.create_self_transfer(fee_rate=Decimal("0.003"))
create_self_transfer() defaults to fee_rate=0.003, explicitly setting it here is redundant and potentially confusing. I’ve removed the parameter to use the default.
86+ from_node=self.nodes[0],
87+ scriptPubKey=external_script,
88+ amount=amount_satoshis,
89+ )
90+ if i == 0:
91+ self.generate(wallet, 1)
wallet.send_self_transfer(from_node=self.nodes) instead?
I think this might make the code simpler than generating scripts and using wallet.send_to.
send_self_transfer() only creates self-transfers (sending back to the wallet’s own address). For this test, we need external outputs to properly test getblockstats UTXO statistics. The send_to() method is necessary here to create transactions with external recipients.
Sorry, I don’t quite understand why specifically external outputs are necessary. In getblockstats, there are four UTXO-related statistics: utxo_increase, utxo_size_inc, utxo_increase_actual, and utxo_size_inc_actual. As far as I can see, none of these depend on whether a UTXO is sent to an external or internal address.
That said, using send_self_transfer would significantly change the generated transactions compared to the original test, so I agree that it’s better to try to keep the generated transactions as close to the original as possible.
You’re correct that UTXO statistics don’t depend on output destination. However, I’m keeping external outputs to maintain consistency with the original test’s transaction structure. Changing to send_self_transfer would alter the generated test data and expected statistics values.
Since the goal is to replace the wallet implementation while preserving test behavior, send_to with external scripts is the most faithful translation of the original sendtoaddress calls.
85+ wallet.send_to(
86+ from_node=self.nodes[0],
87+ scriptPubKey=external_script,
88+ amount=amount_satoshis,
89+ )
90+ if i == 0:
This mining pattern is intentional - it creates a specific block structure for testing:
This allows testing getblockstats across different block scenarios (single vs multi-transaction blocks) rather than having all transactions in one block.
Thank you!
It appears that we are no longer testing the case of send 10 BTC with fee subtracted, nor the case of send 1 BTC with a higher fee rate, since we are not specifying a fee in send_to().
getblockstats functionality across different block structures, which is the primary goal.
110+ def _create_op_return_transaction(self, wallet):
111+ """Create a transaction with OP_RETURN output to test statistics exclusion."""
112+ tx = wallet.create_self_transfer(fee_rate=Decimal("0.003"))
113+ op_return_data = b'\x21'
114+ tx["tx"].vout.append(CTxOut(nValue=0, scriptPubKey=CScript([OP_RETURN, op_return_data])))
115+ wallet.sendrawtransaction(from_node=self.nodes[0], tx_hex=tx["hex"])
Just to confirm, it seems we need to re-serialize the transaction after changing the output. Is that correct?
0 wallet.sendrawtransaction(from_node=self.nodes[0], tx_hex=tx["tx"].serialize().hex())
You’re right - we need to re-serialize after modifying the transaction. The tx["hex"] contains the original transaction, but we’re modifying tx["tx"] by adding the OP_RETURN output. Without re-serializing, the OP_RETURN wouldn’t actually be included in the sent transaction.
I’ve applied your suggested fix.
š§ At least one of the CI tasks failed.
Task lint: https://github.com/bitcoin/bitcoin/runs/48935536189
LLM reason (āØ experimental): Lint check failed due to a style error detected by rust’s ruff, specifically an unused import in a Python test file.
Try to run the tests locally, according to the documentation. However, a CI failure may still happen due to a number of reasons, for example:
Possibly due to a silent merge conflict (the changes in this pull request being incompatible with the current code in the target branch). If so, make sure to rebase on the latest commit of the target branch.
A sanitizer issue, which can only be found by compiling with the sanitizer and running the affected test.
An intermittent issue.
Leave a comment here, if you need help tracking down a confusing failure.
18+from test_framework.script import OP_RETURN, CScript
19+from test_framework.messages import CTxOut, COIN
20+from test_framework.address import address_to_scriptpubkey
21 import json
22 import os
23+from decimal import Decimal
decimal.Decimal
because it used legacy wallet operations
That’s not why it fails, it does not use anything specific to legacy wallets at all. It fails initially because test nodes are started with -disablewallet if self.uses_wallet == False, and then fails again because of multiwallet, and lastly because settxfee is deprecated. But none of these are because of legacy wallet.
Ultimately, the issues stem from the fact that this code path is pretty much never executed, and if MiniWallet were to change in the future, we’d run into the same problem.
because it used legacy wallet operations
That’s not why it fails, it does not use anything specific to legacy wallets at all. It fails initially because test nodes are started with
-disablewalletifself.uses_wallet == False, and then fails again because of multiwallet, and lastly becausesettxfeeis deprecated. But none of these are because of legacy wallet.Ultimately, the issues stem from the fact that this code path is pretty much never executed, and if MiniWallet were to change in the future, we’d run into the same problem.
Thanks for the review @achow101
Originally assumed MiniWallet was the culprit based on the issue comments, but your explanation makes sense: the fixes here does not seem to be a proper solution to the problem.
However, I believe the MiniWallet refactor is still the right approach here. The fundamental issue is that the –gen-test-data code path uses outdated testing patterns that are prone to breaking with framework changes. By modernizing to MiniWallet, we ensure the test follows current best practices and stays compatible with future framework updates.
The alternative would be to just add self.add_wallet_options(parser) and replace deprecated RPCs, but that leaves the test using legacy patterns that could break again. What do you think would be the most effective long-term solution?
Looked into this @achow101 and you’re right about the setup issues - they weren’t legacy wallet specific but rather configuration problems. I’ve addressed the three issues you identified:
Regarding your concern about the –gen-test-data path being rarely executed: I’ve ensured the test runs with proper wallet configuration, making it more likely to be executed in CI and catching issues earlier.
While this PR may seem like overkill for the specific bug, MiniWallet does provide better maintainability and avoids the deprecated RPC patterns you mentioned. The changes are minimal and focused on the core issues.
they weren’t legacy wallet specific but rather configuration problems.
You’ll have to adjust the pull description. Also, CI fails.
To ensure this is tested once, you can add --gen-test-data to one CI task config via TEST_RUNNER_EXTRA.
38@@ -39,6 +39,7 @@ def add_options(self, parser):
39 def set_test_params(self):
40 self.num_nodes = 1
41 self.setup_clean_chain = True
42+ self.uses_wallet = True
MiniWallet doesn’t require wallet rpc, so what caused the “-disablewallet” error?
-disablewallet error was caused by self.uses_wallet = True, not MiniWallet. The test framework starts nodes with -disablewallet when uses_wallet = True in no-wallet CI environments. MiniWallet doesn’t need wallet RPC (it uses sendrawtransaction), so changing to uses_wallet = None allows the test to run in no-wallet environments while still using MiniWallet for transaction creation.
252@@ -253,6 +253,8 @@ def parse_args(self, test_file):
253 help="Explicitly use v1 transport (can be used to overwrite global --v2transport option)")
254 parser.add_argument("--test_methods", dest="test_methods", nargs='*',
255 help="Run specified test methods sequentially instead of the full test. Use only for methods that do not depend on any context set up in run_test or other methods.")
256+ parser.add_argument("--gen-test-data", dest="gen_test_data", action='store_true', default=False,
rpc_blockstats.
I don’t see the advantage of “generate” and “load” paths, and it’s creating unnecessary complexity.
I guess it depends on how long it takes to generate, but if it is just a few seconds, it seems easier not to cache.
@maflcko This is from my 8-core laptop
0ā bitcoin [2e1836d744] build/test/functional/test_runner.py rpc_getblockstats --gen-test-data
1Temporary test directory at /tmp/test_runner_āæ_š_20250930_083649
2Remaining jobs: [rpc_getblockstats.py]
31/1 - rpc_getblockstats.py passed, Duration: 1 s
4
5TEST | STATUS | DURATION
6
7rpc_getblockstats.py | ā Passed | 1 s
8
9ALL | ā Passed | 1 s (accumulated)
10Runtime: 1 s
they weren’t legacy wallet specific but rather configuration problems.
You’ll have to adjust the pull description. Also, CI fails.
To ensure this is tested once, you can add
--gen-test-datato one CI task config via TEST_RUNNER_EXTRA.
Updated the PR title and description
The recent simplification changes make adding a CI task config unnecessary. The test now always generates data with MiniWallet by default, so the data generation path is automatically tested in all CI environments without needing TEST_RUNNER_EXTRA configuration.
I think this test could be simplified to always generate data with the MiniWallet and test with generated data, instead of dumping it to a file and loading it later. I don’t see the advantage of “generate” and “load” paths, and it’s creating unnecessary complexity.
I think this test could be simplified to always generate data with the MiniWallet and test with generated data, instead of dumping it to a file and loading it later. I don’t see the advantage of “generate” and “load” paths, and it’s creating unnecessary complexity. @Eunovo Great suggestion! I’ve implemented this simplification in the latest commit. The test now always generates data with MiniWallet by default, removing the generate/load pattern entirely.
Since the time to generate the data is negligible, it makes much more sense to have it generated by default instead of the previous approach. This eliminates ~50 lines of complexity and makes the test more maintainable.
The test now works in both wallet and no-wallet environments without any special configuration needed.
Changes:
* Changed `self.uses_wallet = True` to `self.uses_wallet = None` to allow no-wallet environments * Added `self.skip_if_no_wallet()` when generating test data to ensure wallet is available when needed * Added `--gen-test-data` to TSan CI via `TEST_RUNNER_EXTRA` to ensure data generation is testedHow it works:
* In no-wallet environments: Test loads pre-generated data (no wallet required) * With `--gen-test-data` flag: Test requires wallet functionality and generates new data * In wallet environments: Test works normally with both modes
the pull description is outdated and doesn’t make sense.
Generally, instead of just repeating the changes made, it could make sense to motivate them and explain why each change makes sense and is correct.
Generally, instead of just repeating the changes made, it could make sense to motivate them and explain why each change makes sense and is correct.
Updated PR description to explain motivation rather than just listing changes.
0@@ -1,117 +1,117 @@
1 {
Yes, since the json data is no longer being cached, this becomes stale
Removed
34- help='Generate test data')
35- parser.add_argument('--test-data', dest='test_data',
36- default='data/rpc_getblockstats.json',
37- action='store', metavar='FILE',
38- help='Test data file')
39+ pass
Yes, this is no longer needed and can be deleted
Done
39+ pass
40
41 def set_test_params(self):
42 self.num_nodes = 1
43 self.setup_clean_chain = True
44+ self.uses_wallet = None
Was supposed to be for the test to work in non wallet environments, but since the test now always uses MiniWallet internally by default, this is no longer needed
Removed the line of code
66- # Send to OP_RETURN output to test its exclusion from statistics
67- self.nodes[0].send(outputs={"data": "21"})
68- self.sync_all()
69- self.generate(self.nodes[0], 1)
70+ def generate_test_data(self):
71+ MOCKTIME = 1525107225
148@@ -177,10 +149,11 @@ def run_test(self):
149
150 self.log.info('Test tip including OP_RETURN')
151 tip_stats = self.nodes[0].getblockstats(tip)
152- assert_equal(tip_stats["utxo_increase"], 6)
153- assert_equal(tip_stats["utxo_size_inc"], 441)
154- assert_equal(tip_stats["utxo_increase_actual"], 4)
155- assert_equal(tip_stats["utxo_size_inc_actual"], 300)
156+ expected_tip_stats = self.expected_stats[self.max_stat_pos]
https://github.com/bitcoin/bitcoin/pull/33184/commits/1ffdf5253388af3cf274efd723b7129d9639da8c
This is basically testing that two results of getblockstats match each other. It doesn’t actually determine the expected_tip_stats in the test and then compare against the actual result of getblockstats.
I also want to note that the generated blocks already contain OP_RETURN outputs in coinbase transactions, so we don’t need to create a specific OP_RETURN output in the test.
This might also remove the need to have a second block at all, since there’s no need to create a new tip for the OP_RETURN test
This is basically testing that two results of
getblockstatsmatch each other. It doesn’t actually determine theexpected_tip_statsin the test and then compare against the actual result ofgetblockstats.
This is a good observation. I’ve reverted to using hardcoded expected values instead of circular getblockstats comparisons, ensuring the test validates actual correctness rather than just consistency.
This might also remove the need to have a second block at all, since there’s no need to create a new tip for the OP_RETURN test
Tested and confirmed coinbase already contains OP_RETURN outputs. I’ve updated the test to use existing coinbase OP_RETURN and removed the unnecessary extra block generation
Concept ACK https://github.com/bitcoin/bitcoin/pull/33184/commits/1ffdf5253388af3cf274efd723b7129d9639da8c
The test is much simpler and the untested path has been eliminated, but I left the comment about the OP_RETURN test below.
- Replace legacy wallet-based test data generation with MiniWallet
- Remove dependency on external test data file (rpc_getblockstats.json)
- Use hardcoded expected values instead of circular getblockstats comparison
- Add manual OP_RETURN transaction creation for testing statistics exclusion
- Maintain backward compatibility with both wallet and no-wallet modes
- Addresses reviewer feedback about circular logic in test assertions
- Remove manual OP_RETURN transaction creation
- Use existing coinbase OP_RETURN outputs for testing statistics exclusion
- Update expected values to match simplified test structure
- Clean up unused imports
43 def get_stats(self):
44 return [self.nodes[0].getblockstats(hash_or_height=self.start_height + i) for i in range(self.max_stat_pos+1)]
45
46- def generate_test_data(self, filename):
47+ def generate_test_data(self):
48 mocktime = 1525107225
tested ACK: f45b94d302a
tests pass locally. I left a nit/question about mocktime.