35 lines
1.2 KiB
Python
35 lines
1.2 KiB
Python
"""Persistent campaign reservations. Failed attempts are never refunded."""
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import fcntl
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import json
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import os
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from pathlib import Path
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MODES = ('control', 'private_standard', 'private_mosaic')
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def reserve(lab: Path, mode: str, episode: str | None = None) -> dict:
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if mode not in MODES or episode not in (None, 'ack', 'timeout'):
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raise ValueError('invalid reservation')
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path = lab / 'saved-budget.json'
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with path.open('a+') as file:
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fcntl.flock(file, fcntl.LOCK_EX)
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file.seek(0)
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raw = file.read()
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state = json.loads(raw) if raw else {'runs': [], 'episodes': []}
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file.seek(0)
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if episode is None:
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if mode in state['runs'] or len(state['runs']) >= 3:
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raise RuntimeError('run budget exhausted')
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state['runs'].append(mode)
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else:
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key = [mode, episode]
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if mode not in state['runs'] or key in state['episodes'] or len(state['episodes']) >= 6:
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raise RuntimeError('episode budget exhausted')
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state['episodes'].append(key)
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file.seek(0)
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file.truncate()
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json.dump(state, file, sort_keys=True)
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file.write('\n')
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file.flush()
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os.fsync(file.fileno())
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return state
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