replication: search for state/sequence number by timestamp #38
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This PR add 4 methods to determine the sequence number from a given timestamp. They will return the state written after the given timestamp.
MinuteStateAt(ctx context.Context, timestamp time.Time) (MinuteSeqNum, *State, error)HourStateAt(ctx context.Context, timestamp time.Time) (HourSeqNum, *State, error)DayStateAt(ctx context.Context, timestamp time.Time) (DaySeqNum, *State, error)ChangesetStateAt(ctx context.Context, timestamp time.Time) (ChangesetSeqNum, *State, error)The binary search across the available states is based on https://github.com/osmcode/pyosmium/blob/000de57139f11cab1f22a99e7d9d3470f79f0947/src/osmium/replication/server.py#L197