Added in error logging

warc_wat_url_processor.py

@@ -6,42 +6,55 @@ from concurrent.futures import ProcessPoolExecutor, as_completed, wait
 import subprocess
 import time
 
+# Function to check disk space
 def check_disk_space(path, min_space_gb=20, check_interval=300):
     while True:
         try:
+            # Run the 'df' command to check disk space
             result = subprocess.run(['df', '-BG', path], stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)
+            
+            # If the command succeeds
             if result.returncode == 0:
                 output = result.stdout.split('\n')[1].split()
                 available_space_gb = int(output[3].replace('G', ''))
+                
+                # If available space is sufficient, break out of the loop
                 if available_space_gb >= min_space_gb:
                     break
                 else:
                     print(f"Waiting for more than {min_space_gb}GB free space on {path}. Current available space: {available_space_gb}GB")
                     time.sleep(check_interval)
             else:
+                # If the command fails, wait and retry
                 print("Error checking disk space.")
                 time.sleep(check_interval)
         except Exception as e:
+            # If an exception occurs, wait and retry
             print(f"An error occurred while checking disk space: {e}")
             time.sleep(check_interval)
 
+# Function to extract URLs from a gzip file
 def extract_urls_from_file(file_path):
     urls = []
     try:
         with gzip.open(file_path, 'rt', encoding='latin-1') as file:
             for line in file:
+                # Regular expression to find URLs in a line
                 url_pattern = re.compile(r'http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\(\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+')
                 line_urls = re.findall(url_pattern, line)
                 urls.extend(line_urls)
     except (gzip.BadGzipFile, EOFError) as e:
+        # Handle gzip-related errors
         print(f"Error while reading the compressed file '{file_path}': {e}")
     except Exception as e:
+        # Handle other unexpected errors
         print(f"An unexpected error occurred while processing '{file_path}': {e}")
         print("Full traceback:")
         traceback.print_exc()
 
     return urls
 
+# Function to process a file
 def process_file(file_path, error_log):
     try:
         print(f"Processing file: {file_path}")
@@ -95,12 +108,16 @@ def process_file(file_path, error_log):
             print(f"Failed to remove {filename} from urls_to_download.txt")
 
     except Exception as e:
+        # Handle any exceptions that occur during file processing
         print(f"Error during processing {file_path}: {e}")
         traceback.print_exc()
         error_log.write(f"Error during processing {file_path}: {e}\n")
 
-def download_and_process_file(url, error_log):
+# Function to download and process a file
+def download_and_process_file(url, error_log_filename):
     try:
+        # Open the error log file for appending
+        with open(error_log_filename, 'a') as error_log:
             command = f'axel -n 3 {url}'
             result = subprocess.run(command, shell=True, check=True, stderr=subprocess.PIPE, text=True)
             if result.returncode == 0:
@@ -109,31 +126,42 @@ def download_and_process_file(url, error_log):
             else:
                 print(f"Download failed for {url}")
                 error_log.write(f"Download failed for {url}\n")
-
     except Exception as e:
+        # Handle any exceptions that occur during download and processing
         print(f"Error during download and processing {url}: {e}")
         error_log.write(f"Error during download and processing {url}: {e}\n")
 
+# Main function
 def main():
+    # Check disk space
     check_disk_space('/dev/sda1')
 
+    # Read URLs from the file
     with open('urls_to_download.txt', 'r') as file:
         urls = file.readlines()
 
     urls = [url.strip() for url in urls]
 
+    # Define the concurrency level
     download_concurrency_level = 40
 
-    with open('error.log', 'a') as error_log:
+    # Define the error log filename
+    error_log_filename = 'error.log'
+
+    # Open the error log file for appending
+    with open(error_log_filename, 'a') as error_log:
         with ProcessPoolExecutor(max_workers=download_concurrency_level) as executor:
             print("Submitting tasks to the ProcessPoolExecutor...")
-            futures = [executor.submit(download_and_process_file, url, error_log) for url in urls]
+            # Submit tasks for each URL
+            futures = [executor.submit(download_and_process_file, url, error_log_filename) for url in urls]
             print(f"Submitted {len(futures)} tasks.")
 
             print("Waiting for tasks to complete...")
+            # Wait for all tasks to complete
             completed_futures, _ = wait(futures)
             print(f"{len(completed_futures)} tasks completed.")
 
+            # Process completed tasks
             for completed_future in completed_futures:
                 try:
                     result = completed_future.result()
@@ -143,5 +171,6 @@ def main():
                     print(f"Error in processing future: {e}")
                     error_log.write(f"Error in processing future: {e}\n")
 
+# Entry point of the script
 if __name__ == "__main__":
     main()