def __iter__(self) -> Event:
"""
Iterates over events in the current events file
:return: An Event object
:except: NotImplementedError if the stream is in non-blocking mode.
:except: EventReadingError on reading error.
"""
while True:
header_size = struct.calcsize('Q')
header = self._read_and_check(header_size)
if header is None:
break
event_size = struct.unpack('Q', header)[0]
event_raw = self._read_and_check(event_size)
if event_raw is None:
raise EventReadingError('Unexpected end of events file')
event = Event()
event.ParseFromString(event_raw)
yield event
def event_reader(filepointer):
while True:
# So, first read a Q
eightbytes = filepointer.read(8)
if len(eightbytes) != 8:
break
header, = struct.unpack("Q", eightbytes)
fourbytes = filepointer.read(4)
purported_header_crc32, = struct.unpack("I", fourbytes)
data = filepointer.read(header)
fourbytes = filepointer.read(4)
purported_data_crc32, = struct.unpack("I", fourbytes)
empiric_header_crc32 = masked_crc32c(struct.pack("Q", header))
empiric_data_crc32 = masked_crc32c(data)
assert empiric_header_crc32 == purported_header_crc32
assert empiric_data_crc32 == purported_data_crc32
evt = Event()
evt.ParseFromString(data)
yield evt
