39 lines
1.4 KiB
Python
39 lines
1.4 KiB
Python
import uuid
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from typing import Dict, List, Tuple
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class DeltaCRDT:
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"""A compact CRDT-like store for delta-based time-series data.
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We store per-device time series as a list of (timestamp, value, delta_id).
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Deltas are deduplicated via delta_id and merged idempotently.
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"""
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def __init__(self) -> None:
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# device_id -> list[(ts, value, delta_id)]
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self.state: Dict[str, List[Tuple[float, float, str]]] = {}
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self.seen: set = set()
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def _new_id(self, device: str, ts: float, value: float) -> str:
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# Simple unique-id generator; deterministic content is not required here
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return str(uuid.uuid4())
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def add_local_delta(self, device: str, ts: float, value: float) -> str:
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delta_id = self._new_id(device, ts, value)
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entry = (ts, value, delta_id)
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self.state.setdefault(device, [])
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self.state[device].append(entry)
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self.seen.add(delta_id)
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return delta_id
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def merge(self, remote_state: Dict[str, List[Tuple[float, float, str]]]) -> None:
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for device, entries in remote_state.items():
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self.state.setdefault(device, [])
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for ts, val, did in entries:
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if did not in self.seen: # type: ignore
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self.state[device].append((ts, val, did))
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self.seen.add(did)
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def export_state(self) -> Dict[str, List[Tuple[float, float, str]]]:
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return self.state
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