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102 lines
2.9 KiB
Python
102 lines
2.9 KiB
Python
import json
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import time
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import hashlib
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# Calculates intersection of time range of both messages, or None if they don't overlap
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def overlap(a, b):
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range_start = max(a['time'], b['time'])
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range_end = min(a['time'] + a['time_range'], b['time'] + b['time_range'])
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if range_end < range_start:
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return None
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return range_start, range_end - range_start
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# Returns merged message if two messages are compatible with being the same message,
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# or else None.
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def merge_message(a, b):
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o = overlap(a, b)
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if o and all(
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a.get(k) == b.get(k)
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for k in set(a.keys()) | set(b.keys())
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if k not in ("receivers", "time", "time_range")
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):
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receivers = a["receivers"] | b["receivers"]
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# Error checking - make sure no receiver timestamps are being overwritten.
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# This would indicate we're merging two messages recieved at different times
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# by the same recipient.
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for k in receivers.keys():
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for old in (a, b):
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if k in old and old[k] != receivers[k]:
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raise ValueError(f"Merge would merge two messages with different recipient timestamps: {a}, {b}")
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return a | {
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"time": o[0],
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"time_range": o[1],
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"receivers": receivers,
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}
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return None
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def merge_messages(left, right):
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# An optimization - if either size is empty, return the other side without processing.
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if not left:
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return right
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if not right:
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return left
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# Match things with identical ids first, and collect unmatched into left and right lists
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by_id = {}
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unmatched = [], []
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for messages, u in zip((left, right), unmatched):
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for message in messages:
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id = (message.get('tags') or {}).get('id')
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if id:
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by_id.setdefault(id, []).append(message)
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else:
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u.append(message)
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result = []
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for id, messages in by_id.items():
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if len(messages) == 1:
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result.append(messages[0])
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else:
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merged = merge_message(*messages)
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if merged is None:
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raise ValueError(f"Got two non-matching messages with id {id}: {messages[0]}, {messages[1]}")
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result.append(merged)
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# For time-range messages, pair off each one in left with first match in right,
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# and pass through anything with no matches.
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left_unmatched, right_unmatched = unmatched
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for message in left_unmatched:
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for other in right_unmatched:
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merged = merge_message(message, other)
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if merged:
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right_unmatched.remove(other)
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result.append(merged)
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break
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else:
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result.append(message)
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for message in right_unmatched:
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result.append(message)
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return result
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def load(file):
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with open(file) as f:
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return [json.loads(line) for line in f.read().strip().split("\n")]
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def main(*files):
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batches = [load(file) for file in files]
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result = batches[0]
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start = time.monotonic()
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for batch in batches[1:]:
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result = merge_messages(result, batch)
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interval = time.monotonic() - start
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hash = hashlib.sha256(json.dumps(result).encode()).hexdigest()
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print(f"Merged {len(batches)} batches in {interval:.3f}s to hash {hash}")
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if __name__ == '__main__':
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import sys
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main(*sys.argv[1:])
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