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0a50834 | 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 | import fcntl
import hashlib
import json
import sqlite3
from contextlib import contextmanager
from pathlib import Path
def fingerprint(value):
return hashlib.sha256(json.dumps(value, sort_keys=True).encode()).hexdigest()
@contextmanager
def locked_state(directory):
directory = Path(directory)
directory.mkdir(parents=True, exist_ok=True)
with (directory / 'worker.lock').open('a') as lock:
try:
fcntl.flock(lock, fcntl.LOCK_EX | fcntl.LOCK_NB)
except BlockingIOError:
raise RuntimeError('Another vector worker is using this state volume.') from None
with sqlite3.connect(directory / 'cache.sqlite') as db:
db.execute('CREATE TABLE IF NOT EXISTS vectors (key TEXT PRIMARY KEY, value TEXT NOT NULL)')
yield db
def cached_vectors(db, key, produce):
row = db.execute('SELECT value FROM vectors WHERE key=?', (key,)).fetchone()
if row:
return json.loads(row[0])
vectors = produce()
db.execute('INSERT INTO vectors VALUES (?,?)', (key, json.dumps(vectors)))
db.commit()
return vectors
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