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Fix to_csv chunk sizing

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Watchful1 2023-01-30 17:05:03 -08:00
parent 33b5b938c1
commit 4e8d6c9b6b
1 changed files with 14 additions and 1 deletions
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15
scripts/to_csv.py
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@ -21,12 +21,25 @@ log.setLevel(logging.DEBUG)
log.addHandler(logging.StreamHandler()) log.addHandler(logging.StreamHandler())
def read_and_decode(reader, chunk_size, max_window_size, previous_chunk=None, bytes_read=0):
chunk = reader.read(chunk_size)
bytes_read += chunk_size
if previous_chunk is not None:
chunk = previous_chunk + chunk
try:
return chunk.decode()
except UnicodeDecodeError:
if bytes_read > max_window_size:
raise UnicodeError(f"Unable to decode frame after reading {bytes_read:,} bytes")
return read_and_decode(reader, chunk_size, max_window_size, chunk, bytes_read)
def read_lines_zst(file_name): def read_lines_zst(file_name):
with open(file_name, 'rb') as file_handle: with open(file_name, 'rb') as file_handle:
buffer = '' buffer = ''
reader = zstandard.ZstdDecompressor(max_window_size=2**31).stream_reader(file_handle) reader = zstandard.ZstdDecompressor(max_window_size=2**31).stream_reader(file_handle)
while True: while True:
chunk = reader.read(2**27).decode() chunk = read_and_decode(reader, 2**27, (2**29) * 2)
if not chunk: if not chunk:
break break
lines = (buffer + chunk).split("\n") lines = (buffer + chunk).split("\n")