mirror of
https://github.com/Watchful1/PushshiftDumps.git
synced 2025-07-04 11:26:41 -04:00
587 lines
24 KiB
Python
587 lines
24 KiB
Python
# this script iterates through zst compressed ndjson files, like the pushshift reddit dumps, loads each line
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# and if it matches the criteria in the command line arguments, it's written out into a separate file for
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# that month. After all the ndjson files are processed, it iterates through the resulting files and combines
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# them into a final file.
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# this script assumes the files are named in chronological order and prefixed with RS_ or RC_, like the pushshift dumps
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# features:
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# - multiple processes in parallel to maximize drive read and decompression
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# - saves state as it completes each file and picks up where it stopped
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# - detailed progress indicators
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# examples:
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# - get all comments that have a subreddit field (subreddit is the default) of "wallstreetbets". This will create a single output file "wallstreetbets_comments.zst" in the folder the script is run in
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# python3 combine_folder_multiprocess.py reddit/comments --value wallstreetbets
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# - get all comments and submissions (assuming both types of dump files are under the reddit folder) that have an author field of Watchful1 or spez and output the results to a folder called pushshift.
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# This will result in four files, pushshift/Watchful1_comments, pushshift/Watchful1_submissions, pushshift/spez_comments, pushshift/spez_submissions
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# python3 combine_folder_multiprocess.py reddit --field author --value Watchful1,spez --output pushshift
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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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import time
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import argparse
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import re
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from collections import defaultdict
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import logging.handlers
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import multiprocessing
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from enum import Enum
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# sets up logging to the console as well as a file
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log = logging.getLogger("bot")
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log.setLevel(logging.INFO)
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log_formatter = logging.Formatter('%(asctime)s - %(levelname)s: %(message)s')
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log_str_handler = logging.StreamHandler()
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log_str_handler.setFormatter(log_formatter)
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log.addHandler(log_str_handler)
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if not os.path.exists("logs"):
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os.makedirs("logs")
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log_file_handler = logging.handlers.RotatingFileHandler(
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os.path.join("logs", "bot.log"), maxBytes=1024*1024*16, backupCount=5)
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log_file_handler.setFormatter(log_formatter)
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log.addHandler(log_file_handler)
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class FileType(Enum):
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COMMENT = 1
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SUBMISSION = 2
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@staticmethod
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def to_str(file_type):
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if file_type == FileType.COMMENT:
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return "comments"
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elif file_type == FileType.SUBMISSION:
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return "submissions"
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return "other"
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# convenience object used to pass status information between processes
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class FileConfig:
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def __init__(self, input_path, output_path=None, complete=False, lines_processed=0, error_lines=0, lines_matched=0):
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self.input_path = input_path
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self.output_path = output_path
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self.file_size = os.stat(input_path).st_size
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self.complete = complete
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self.bytes_processed = self.file_size if complete else 0
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self.lines_processed = lines_processed if complete else 0
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self.error_message = None
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self.error_lines = error_lines
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self.lines_matched = lines_matched
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file_name = os.path.split(input_path)[1]
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if file_name.startswith("RS"):
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self.file_type = FileType.SUBMISSION
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elif file_name.startswith("RC"):
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self.file_type = FileType.COMMENT
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else:
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raise ValueError(f"Unknown working file type: {file_name}")
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def __str__(self):
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return f"{self.input_path} : {self.output_path} : {self.file_size} : {self.complete} : {self.bytes_processed} : {self.lines_processed}"
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# another convenience object to read and write from both zst files and ndjson files
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class FileHandle:
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newline_encoded = "\n".encode('utf-8')
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ext_len = len(".zst")
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def __init__(self, path, is_split=False):
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self.path = path
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self.is_split = is_split
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self.handles = {}
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def get_paths(self, character_filter=None):
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if self.is_split:
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paths = []
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for file in os.listdir(self.path):
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if not file.endswith(".zst"):
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continue
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if character_filter is not None and character_filter != file[-FileHandle.ext_len - 1:-FileHandle.ext_len]:
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continue
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paths.append(os.path.join(self.path, file))
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return paths
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else:
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return [self.path]
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def get_count_files(self):
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return len(self.get_paths())
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# recursively decompress and decode a chunk of bytes. If there's a decode error then read another chunk and try with that, up to a limit of max_window_size bytes
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@staticmethod
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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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return FileHandle.read_and_decode(reader, chunk_size, max_window_size, chunk, bytes_read)
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# open a zst compressed ndjson file, or a regular uncompressed ndjson file and yield lines one at a time
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# also passes back file progress
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def yield_lines(self, character_filter=None):
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if self.is_split:
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if character_filter is not None:
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path = os.path.join(self.path, f"{character_filter}.zst")
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else:
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raise ValueError(f"{self.path} is split but no filter passed")
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else:
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path = self.path
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if os.path.exists(path):
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with open(path, '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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while True:
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chunk = FileHandle.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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# get either the main write handle or the character filter one, opening a new handle as needed
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def get_write_handle(self, character_filter=None):
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if character_filter is None:
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character_filter = 1 # use 1 as the default name since ints hash quickly
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handle = self.handles.get(character_filter)
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if handle is None:
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if character_filter == 1:
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path = self.path
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else:
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if not os.path.exists(self.path):
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os.makedirs(self.path)
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path = os.path.join(self.path, f"{character_filter}.zst")
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handle = zstandard.ZstdCompressor().stream_writer(open(path, 'wb'))
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self.handles[character_filter] = handle
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return handle
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# write a line, opening the appropriate handle
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def write_line(self, line, value=None):
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if self.is_split:
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if value is None:
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raise ValueError(f"{self.path} is split but no value passed")
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character_filter = value[:1]
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handle = self.get_write_handle(character_filter)
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else:
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handle = self.get_write_handle()
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handle.write(line.encode('utf-8'))
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handle.write(FileHandle.newline_encoded)
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def close(self):
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for handle in self.handles.values():
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handle.close()
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# used for calculating running average of read speed
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class Queue:
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def __init__(self, max_size):
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self.list = []
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self.max_size = max_size
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def put(self, item):
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if len(self.list) >= self.max_size:
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self.list.pop(0)
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self.list.append(item)
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def peek(self):
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return self.list[0] if len(self.list) > 0 else None
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# save file information and progress to a json file
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# we don't want to save the whole FileConfig object, since some info resets if we restart
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def save_file_list(input_files, working_folder, status_json, arg_string, script_type, completed_prefixes=None):
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if not os.path.exists(working_folder):
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os.makedirs(working_folder)
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simple_file_list = []
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for file in input_files:
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simple_file_list.append([file.input_path, file.output_path, file.complete, file.lines_processed, file.error_lines, file.lines_matched])
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if completed_prefixes is None:
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completed_prefixes = []
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else:
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completed_prefixes = sorted([prefix for prefix in completed_prefixes])
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with open(status_json, 'w') as status_json_file:
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output_dict = {
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"args": arg_string,
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"type": script_type,
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"completed_prefixes": completed_prefixes,
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"files": simple_file_list,
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}
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status_json_file.write(json.dumps(output_dict, indent=4))
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# load file information from the json file and recalculate file sizes
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def load_file_list(status_json):
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if os.path.exists(status_json):
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with open(status_json, 'r') as status_json_file:
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output_dict = json.load(status_json_file)
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input_files = []
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for simple_file in output_dict["files"]:
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input_files.append(
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FileConfig(simple_file[0], simple_file[1], simple_file[2], simple_file[3], simple_file[4], simple_file[5])
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)
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completed_prefixes = set()
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for prefix in output_dict["completed_prefixes"]:
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completed_prefixes.add(prefix)
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return input_files, output_dict["args"], output_dict["type"], completed_prefixes
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else:
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return None, None, None, set()
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# base of each separate process. Loads a file, iterates through lines and writes out
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# the ones where the `field` of the object matches `value`. Also passes status
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# information back to the parent via a queue
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def process_file(file, queue, field, values, partial, regex, split_intermediate):
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queue.put(file)
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input_handle = FileHandle(file.input_path)
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output_handle = FileHandle(file.output_path, is_split=split_intermediate)
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value = None
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if len(values) == 1:
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value = min(values)
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try:
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for line, file_bytes_processed in input_handle.yield_lines():
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try:
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obj = json.loads(line)
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matched = False
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observed = obj[field].lower()
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if regex:
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for reg in values:
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if reg.search(observed):
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matched = True
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break
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elif partial:
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for val in values:
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if val in observed:
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matched = True
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break
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else:
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if value is not None:
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if observed == value:
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matched = True
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elif observed in values:
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matched = True
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if matched:
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output_handle.write_line(line, observed)
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file.lines_matched += 1
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except (KeyError, json.JSONDecodeError, AttributeError) as err:
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file.error_lines += 1
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file.lines_processed += 1
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if file.lines_processed % 1000000 == 0:
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file.bytes_processed = file_bytes_processed
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queue.put(file)
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output_handle.close()
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file.complete = True
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file.bytes_processed = file.file_size
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except Exception as err:
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file.error_message = str(err)
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queue.put(file)
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if __name__ == '__main__':
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parser = argparse.ArgumentParser(description="Use multiple processes to decompress and iterate over pushshift dump files")
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parser.add_argument("input", help="The input folder to recursively read files from")
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parser.add_argument("--output", help="Put the output files in this folder", default="")
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parser.add_argument("--working", help="The folder to store temporary files in", default="pushshift_working")
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parser.add_argument("--field", help="When deciding what lines to keep, use this field for comparisons", default="subreddit")
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parser.add_argument("--value", help="When deciding what lines to keep, compare the field to this value. Supports a comma separated list. This is case sensitive", default="pushshift")
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parser.add_argument("--value_list", help="A file of newline separated values to use. Overrides the value param if it is set", default=None)
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parser.add_argument("--processes", help="Number of processes to use", default=10, type=int)
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parser.add_argument("--file_filter", help="Regex filenames have to match to be processed", default="^RC_|^RS_")
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parser.add_argument("--split_intermediate", help="Split the intermediate files by the first letter of the matched field, use if the filter will result in a large number of separate files", action="store_true")
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parser.add_argument(
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"--error_rate", help=
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"Percentage as an integer from 0 to 100 of the lines where the field can be missing. For the subreddit field especially, "
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"there are a number of posts that simply don't have a subreddit attached", default=1, type=int)
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parser.add_argument("--debug", help="Enable debug logging", action='store_const', const=True, default=False)
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parser.add_argument(
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"--partial", help="The values only have to be contained in the field, not match exactly. If this is set, "
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"the output files are not split by value. WARNING: This can severely slow down the script, especially if searching the "
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"body.", action='store_const', const=True, default=False)
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parser.add_argument(
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"--regex", help="The values are treated as regular expressions. If this is set, "
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"the output files are not split by value. WARNING: This can severely slow down the script, especially if searching the "
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"body. If set, ignores the --partial flag", action='store_const', const=True, default=False)
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script_type = "split"
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args = parser.parse_args()
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arg_string = f"{args.field}:{(args.value if args.value else args.value_list)}"
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if args.debug:
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log.setLevel(logging.DEBUG)
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log.info(f"Loading files from: {args.input}")
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if args.output:
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log.info(f"Writing output to: {args.output}")
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else:
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log.info(f"Writing output to working folder")
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if (args.partial or args.regex) and args.split_intermediate:
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log.info("The partial and regex flags are not compatible with the split_intermediate flag")
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sys.exit(1)
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values = set()
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if args.value_list:
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log.info(f"Reading {args.value_list} for values to compare")
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with open(args.value_list, 'r') as value_list_handle:
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for line in value_list_handle:
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values.add(line)
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else:
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values = set(args.value.split(","))
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if args.regex:
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regexes = []
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for reg in values:
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regexes.append(re.compile(reg))
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values = regexes
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if len(values) > 1:
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log.info(f"Checking field {args.field} against {len(values)} regexes")
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else:
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log.info(f"Checking field {args.field} against regex {values[0]}")
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else:
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lower_values = set()
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for value_inner in values:
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lower_values.add(value_inner.strip().lower())
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values = lower_values
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if len(values) > 5:
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val_string = f"any of {len(values)} values"
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elif len(values) == 1:
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val_string = f"the value {(','.join(values))}"
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else:
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val_string = f"any of the values {(','.join(values))}"
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if args.partial:
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log.info(f"Checking if any of {val_string} are contained in field {args.field}")
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else:
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log.info(f"Checking if any of {val_string} exactly match field {args.field}")
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multiprocessing.set_start_method('spawn')
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queue = multiprocessing.Manager().Queue()
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status_json = os.path.join(args.working, "status.json")
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input_files, saved_arg_string, saved_type, completed_prefixes = load_file_list(status_json)
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if saved_arg_string and saved_arg_string != arg_string:
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log.warning(f"Args don't match args from json file. Delete working folder")
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sys.exit(0)
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if saved_type and saved_type != script_type:
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log.warning(f"Script type doesn't match type from json file. Delete working folder")
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sys.exit(0)
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# if the file list wasn't loaded from the json, this is the first run, find what files we need to process
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if input_files is None:
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input_files = []
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for subdir, dirs, files in os.walk(args.input):
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files.sort()
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for file_name in files:
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if file_name.endswith(".zst") and re.search(args.file_filter, file_name) is not None:
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input_path = os.path.join(subdir, file_name)
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if args.split_intermediate:
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output_extension = ""
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else:
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output_extension = ".zst"
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output_path = os.path.join(args.working, f"{file_name[:-4]}{output_extension}")
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input_files.append(FileConfig(input_path, output_path=output_path))
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save_file_list(input_files, args.working, status_json, arg_string, script_type)
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else:
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log.info(f"Existing input file was read, if this is not correct you should delete the {args.working} folder and run this script again")
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files_processed, total_bytes, total_bytes_processed, total_lines_processed, total_lines_matched, total_lines_errored = 0, 0, 0, 0, 0, 0
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files_to_process = []
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# calculate the total file size for progress reports, build a list of incomplete files to process
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# do this largest to smallest by file size so that we aren't processing a few really big files with only a few threads at the end
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for file in sorted(input_files, key=lambda item: item.file_size, reverse=True):
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total_bytes += file.file_size
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if file.complete:
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files_processed += 1
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total_lines_processed += file.lines_processed
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total_lines_matched += file.lines_matched
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total_bytes_processed += file.file_size
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total_lines_errored += file.error_lines
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else:
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files_to_process.append(file)
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log.info(f"Processed {files_processed} of {len(input_files)} files with {(total_bytes_processed / (2**30)):.2f} of {(total_bytes / (2**30)):.2f} gigabytes")
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start_time = time.time()
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if len(files_to_process):
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progress_queue = Queue(40)
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progress_queue.put([start_time, total_lines_processed, total_bytes_processed])
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speed_queue = Queue(40)
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for file in files_to_process:
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log.info(f"Processing file: {file.input_path}")
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# start the workers
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with multiprocessing.Pool(processes=min(args.processes, len(files_to_process))) as pool:
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workers = pool.starmap_async(process_file, [(file, queue, args.field, values, args.partial, args.regex, args.split_intermediate) for file in files_to_process], chunksize=1, error_callback=log.info)
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while not workers.ready() or not queue.empty():
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# loop until the workers are all done, pulling in status messages as they are sent
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file_update = queue.get()
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if file_update.error_message is not None:
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log.warning(f"File failed {file_update.input_path}: {file_update.error_message}")
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# this is the workers telling us they are starting a new file, print the debug message but nothing else
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if file_update.lines_processed == 0:
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log.debug(f"Starting file: {file_update.input_path} : {file_update.file_size:,}")
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continue
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# I'm going to assume that the list of files is short enough that it's no
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# big deal to just iterate each time since that saves a bunch of work
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total_lines_processed, total_lines_matched, total_bytes_processed, total_lines_errored, files_processed, files_errored, i = 0, 0, 0, 0, 0, 0, 0
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for file in input_files:
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if file.input_path == file_update.input_path:
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input_files[i] = file_update
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file = file_update
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total_lines_processed += file.lines_processed
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total_lines_matched += file.lines_matched
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total_bytes_processed += file.bytes_processed
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total_lines_errored += file.error_lines
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files_processed += 1 if file.complete or file.error_message is not None else 0
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files_errored += 1 if file.error_message is not None else 0
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i += 1
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if file_update.complete or file_update.error_message is not None:
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save_file_list(input_files, args.working, status_json, arg_string, script_type)
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log.debug(f"Finished file: {file_update.input_path} : {file_update.file_size:,}")
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current_time = time.time()
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progress_queue.put([current_time, total_lines_processed, total_bytes_processed])
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first_time, first_lines, first_bytes = progress_queue.peek()
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bytes_per_second = int((total_bytes_processed - first_bytes)/(current_time - first_time))
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speed_queue.put(bytes_per_second)
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seconds_left = int((total_bytes - total_bytes_processed) / int(sum(speed_queue.list) / len(speed_queue.list)))
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minutes_left = int(seconds_left / 60)
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hours_left = int(minutes_left / 60)
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days_left = int(hours_left / 24)
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log.info(
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f"{total_lines_processed:,} lines at {(total_lines_processed - first_lines)/(current_time - first_time):,.0f}/s, {total_lines_errored:,} errored, {total_lines_matched:,} matched : "
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f"{(total_bytes_processed / (2**30)):.2f} gb at {(bytes_per_second / (2**20)):,.0f} mb/s, {(total_bytes_processed / total_bytes) * 100:.0f}% : "
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f"{files_processed}({files_errored})/{len(input_files)} files : "
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f"{(str(days_left) + 'd ' if days_left > 0 else '')}{hours_left - (days_left * 24)}:{minutes_left - (hours_left * 60):02}:{seconds_left - (minutes_left * 60):02} remaining")
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log.info(f"{total_lines_processed:,}, {total_lines_errored} errored : {(total_bytes_processed / (2**30)):.2f} gb, {(total_bytes_processed / total_bytes) * 100:.0f}% : {files_processed}/{len(input_files)}")
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type_handles = defaultdict(list)
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prefixes = set()
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count_incomplete = 0
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count_intermediate_files = 0
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# build a list of output files to combine
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for file in sorted(input_files, key=lambda item: os.path.split(item.output_path)[1]):
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if not file.complete:
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if file.error_message is not None:
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log.info(f"File {file.input_path} errored {file.error_message}")
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else:
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log.info(f"File {file.input_path} is not marked as complete")
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count_incomplete += 1
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else:
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if file.error_lines > file.lines_processed * (args.error_rate * 0.01):
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log.info(
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f"File {file.input_path} has {file.error_lines:,} errored lines out of {file.lines_processed:,}, "
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f"{(file.error_lines / file.lines_processed) * (args.error_rate * 0.01):.2f}% which is above the limit of {args.error_rate}%")
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count_incomplete += 1
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elif file.output_path is not None and os.path.exists(file.output_path):
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input_handle = FileHandle(file.output_path, is_split=args.split_intermediate)
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for path in input_handle.get_paths():
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prefixes.add(path[-FileHandle.ext_len - 1:-FileHandle.ext_len])
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count_intermediate_files += 1
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type_handles[file.file_type].append(input_handle)
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if count_incomplete > 0:
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log.info(f"{count_incomplete} files were not completed, errored or don't exist, something went wrong. Aborting")
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sys.exit()
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log.info(f"Processing complete, combining {count_intermediate_files} result files")
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for completed_prefix in completed_prefixes:
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if completed_prefix in prefixes:
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prefixes.remove(completed_prefix)
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output_lines = 0
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output_handles = {}
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files_combined = 0
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if values:
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split = True
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else:
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split = False
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if args.split_intermediate:
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for prefix in sorted(prefixes):
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log.info(f"From {files_combined}/{count_intermediate_files} files to {len(output_handles):,} output handles : {output_lines:,}/{total_lines_matched:,} lines")
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for file_type, input_handles in type_handles.items():
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for input_handle in input_handles:
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has_lines = False
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for line, file_bytes_processed in input_handle.yield_lines(character_filter=prefix):
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if not has_lines:
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has_lines = True
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files_combined += 1
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output_lines += 1
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obj = json.loads(line)
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observed_case = obj[args.field]
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observed = observed_case.lower()
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if observed not in output_handles:
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if args.output:
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if not os.path.exists(args.output):
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os.makedirs(args.output)
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output_file_path = os.path.join(args.output, f"{observed_case}_{FileType.to_str(file_type)}.zst")
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else:
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output_file_path = f"{observed_case}_{FileType.to_str(file_type)}.zst"
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log.debug(f"Writing to file {output_file_path}")
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output_handle = FileHandle(output_file_path)
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output_handles[observed] = output_handle
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else:
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output_handle = output_handles[observed]
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output_handle.write_line(line)
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if output_lines % 1000000 == 0:
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log.info(f"From {files_combined}/{count_intermediate_files} files to {len(output_handles):,} output handles : {output_lines:,}/{total_lines_matched:,} lines : {input_handle.path} / {prefix}")
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for handle in output_handles.values():
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handle.close()
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output_handles = {}
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completed_prefixes.add(prefix)
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save_file_list(input_files, args.working, status_json, arg_string, script_type, completed_prefixes)
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else:
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log.info(f"From {files_combined}/{count_intermediate_files} files to {len(output_handles):,} output handles : {output_lines:,}/{total_lines_matched:,} lines")
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for file_type, input_handles in type_handles.items():
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for input_handle in input_handles:
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files_combined += 1
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for line, file_bytes_processed in input_handle.yield_lines():
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output_lines += 1
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obj = json.loads(line)
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if args.partial or args.regex:
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observed_case = "output"
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else:
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observed_case = obj[args.field]
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observed = observed_case.lower()
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if observed not in output_handles:
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if args.output:
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if not os.path.exists(args.output):
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os.makedirs(args.output)
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output_file_path = os.path.join(args.output, f"{observed_case}_{FileType.to_str(file_type)}.zst")
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else:
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output_file_path = f"{observed_case}_{FileType.to_str(file_type)}.zst"
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log.debug(f"Writing to file {output_file_path}")
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output_handle = FileHandle(output_file_path)
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output_handles[observed] = output_handle
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else:
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output_handle = output_handles[observed]
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output_handle.write_line(line)
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if output_lines % 1000000 == 0:
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log.info(f"From {files_combined}/{count_intermediate_files} files to {len(output_handles):,} output handles : {output_lines:,}/{total_lines_matched:,} lines : {input_handle.path}")
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for handle in output_handles.values():
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handle.close()
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output_handles = {}
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log.info(f"From {files_combined}/{count_intermediate_files} files to {len(output_handles):,} output handles : {output_lines:,}/{total_lines_matched:,} lines")
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