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75 lines
2 KiB
Python
75 lines
2 KiB
Python
# this is an example of loading and iterating over a single file
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import zstandard
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import os
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import json
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import sys
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from datetime import datetime
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import logging.handlers
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log = logging.getLogger("bot")
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log.setLevel(logging.DEBUG)
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log.addHandler(logging.StreamHandler())
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def read_and_decode(reader, chunk_size, max_window_size, previous_chunk=None, bytes_read=0):
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chunk = reader.read(chunk_size)
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bytes_read += chunk_size
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if previous_chunk is not None:
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chunk = previous_chunk + chunk
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try:
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return chunk.decode()
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except UnicodeDecodeError:
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if bytes_read > max_window_size:
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raise UnicodeError(f"Unable to decode frame after reading {bytes_read:,} bytes")
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log.info(f"Decoding error with {bytes_read:,} bytes, reading another chunk")
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return read_and_decode(reader, chunk_size, max_window_size, chunk, bytes_read)
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def read_lines_zst(file_name):
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with open(file_name, 'rb') as file_handle:
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buffer = ''
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reader = zstandard.ZstdDecompressor(max_window_size=2**31).stream_reader(file_handle)
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#reader.read(40000000000)
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while True:
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chunk = read_and_decode(reader, 2**27, (2**29) * 2)
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if not chunk:
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break
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lines = (buffer + chunk).split("\n")
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for line in lines[:-1]:
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yield line, file_handle.tell()
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buffer = lines[-1]
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reader.close()
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if __name__ == "__main__":
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file_path = sys.argv[1]
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file_size = os.stat(file_path).st_size
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file_lines = 0
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file_bytes_processed = 0
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created = None
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field = "subreddit"
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value = "wallstreetbets"
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bad_lines = 0
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# try:
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for line, file_bytes_processed in read_lines_zst(file_path):
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try:
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obj = json.loads(line)
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created = datetime.utcfromtimestamp(int(obj['created_utc']))
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temp = obj[field] == value
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except (KeyError, json.JSONDecodeError) as err:
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bad_lines += 1
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file_lines += 1
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if file_lines % 100000 == 0:
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log.info(f"{created.strftime('%Y-%m-%d %H:%M:%S')} : {file_lines:,} : {bad_lines:,} : {file_bytes_processed:,}:{(file_bytes_processed / file_size) * 100:.0f}%")
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# except Exception as err:
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# log.info(err)
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log.info(f"Complete : {file_lines:,} : {bad_lines:,}")
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