File size: 3,178 Bytes
bbff072 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | #!/usr/bin/env python3
"""Format-5 exchange across frozen V5/V7 writers and the current V8 engine."""
import hashlib
import importlib.util
import json
from pathlib import Path
import sys
import tempfile
HERE = Path(__file__).resolve().parent
ROOT = HERE.parent
sys.dont_write_bytecode = True
def load(name, path):
spec = importlib.util.spec_from_file_location(name, path)
module = importlib.util.module_from_spec(spec)
sys.modules[name] = module
spec.loader.exec_module(module)
return module
def main():
paths = {'v5': HERE / 'baselines/v5.py', 'v7': HERE / 'baselines/v7.py',
'v8': ROOT / 'pagefs.py'}
hashes = {name: hashlib.sha256(path.read_bytes()).hexdigest() for name, path in paths.items()}
modules = {name: load('compat_' + name, path) for name, path in paths.items()}
checks = []
for origin in ('v5', 'v7'):
expected = {f'/entry/{i:04d}': bytes([i % 251]) * 128 for i in range(128)}
receipts = {}
with tempfile.TemporaryDirectory(prefix='nyarion-v8-compatible-') as tmp:
image = Path(tmp) / 'compatible.img'
with modules[origin].PageStore.create(image, initial_files=expected, pool_blocks=2048) as store:
for i in range(100):
key, data, token = f'/entry/{i:04d}', bytes([i]) * 1024, f'old-{i}'
receipts[token] = store.transact({key: data}, token)
expected[key] = data
store.checkpoint()
with modules['v8'].PageStore(image) as store:
for key, data in expected.items():
assert store.get(key) == data
for i in range(100):
key, data, token = f'/entry/{i:04d}', bytes([i + 1]) * 128, f'new-{i}'
receipts[token] = store.transact({key: data}, token)
expected[key] = data
store.checkpoint()
for reader in ('v5', 'v7', 'v8'):
with modules[reader].PageStore(image, writable=False) as store:
assert store.epoch == 200
assert store.files() == sorted(expected)
for key, data in expected.items():
assert store.get(key) == data
for token, epoch in receipts.items():
assert store.query(token)['epoch'] == epoch
checks.append({'initial_writer': origin, 'subsequent_writer': 'v8',
'reader': reader, 'transactions': 200,
'exact_receipt_epochs_and_contents_verified': True})
assert {name: hashlib.sha256(path.read_bytes()).hexdigest() for name, path in paths.items()} == hashes
result = {'passed': True, 'persistent_format': 5, 'source_sha256': hashes,
'volumes': 2, 'transactions_per_volume': 200, 'reader_checks': checks,
'scope': 'format compatibility; older writers do not inherit V8 admission guarantees'}
(HERE / 'compatibility_results.json').write_text(json.dumps(result, indent=2) + '\n')
print(json.dumps(result, indent=2))
if __name__ == '__main__':
main()
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