Prompt Title: Following Rotated Logfiles.

Created 11 months ago
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Human: how to follow logfile when the log rotate in python code
ChatGPT:

When you are following a log file in Python code and the log file rotates, you need to make sure that your code continues to follow the new log file after it rotates. Here's how you can do it:

  1. Import the necessary modules:
python
import os import time
  1. Get the file path of the log file and the initial file size:
python
log_file_path = '/path/to/log/file.log' initial_file_size = os.path.getsize(log_file_path)
  1. Open the log file and start reading from the end:
python
with open(log_file_path, 'rb') as file: file.seek(initial_file_size) while True: line = file.readline() if not line: time.sleep(0.1) continue print(line)
  1. Check the file size periodically and reopen the file if it has been rotated:
python
current_file_size = os.path.getsize(log_file_path) if current_file_size < initial_file_size: file.close() file = open(log_file_path, 'rb') initial_file_size = 0

This code will continuously follow the log file even after it has been rotated. Note that you may need to modify the code depending on the log file format and rotation mechanism being used.

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hamid
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