def test_value_accumulator_with_one_value_is_stored_as_single_float64():
acc = ValueAccumulator()
acc.add(4.2)
data = acc.to_bytes()
assert struct.unpack('d', data)[0] == 4.2
restored_acc = ValueAccumulator.from_bytes(data)
assert acc == restored_acc
def test_value_accumulator_can_be_stored_as_bytes():
values = [4.2, -1.3, 10.8]
acc = ValueAccumulator(values)
data = acc.to_bytes()
assert isinstance(data, bytes)
restored_acc = ValueAccumulator.from_bytes(data)
assert acc == restored_acc
def decode(key: bytes, value: bytes) -> Optional[MetricsEvent]:
key = int.from_bytes(key, byteorder='big', signed=False)
ts = datetime.utcfromtimestamp((key >> KvStoreMetricsFormat.seq_bits) / 1000000.0)
name = int.from_bytes(value[:32], byteorder='big', signed=False)
if name not in MetricsName.__members__.values():
return None
name = MetricsName(name)
data = value[32:]
if len(data) == 8:
value = struct.unpack('d', data)[0]
else:
value = ValueAccumulator.from_bytes(data)
return MetricsEvent(ts, name, value)
def decode(key: bytes, value: bytes) -> Optional[MetricsEvent]:
key = int.from_bytes(key, byteorder='big', signed=False)
ts = datetime.utcfromtimestamp((key >> KvStoreMetricsFormat.seq_bits) / 1000000.0)
name = int.from_bytes(value[:32], byteorder='big', signed=False)
if name not in MetricsName.__members__.values():
return None
name = MetricsName(name)
data = value[32:]
if len(data) == 8:
value = struct.unpack('d', data)[0]
else:
value = ValueAccumulator.from_bytes(data)
return MetricsEvent(ts, name, value)