lockfile.py

import logging
import os
from flask import Flask, jsonify

app = Flask(__name__)

# Create a lock file to indicate whether a request is in progress
lock_file_path = "request_lock.lock"

@app.route('/')
def my_endpoint():
    # Check if the lock file exists, indicating a request is in progress
    if os.path.exists(lock_file_path):
        return jsonify({"message": "A request is already in progress. Please try again later."})

    # Create the lock file to indicate that a request is in progress
    with open(lock_file_path, "w") as lock_file:
        lock_file.write("Request in progress")

    try:
        # Generate a unique log filename for this request, e.g., based on a timestamp or request ID
        log_filename = f"my_log_{get_unique_id()}.log"

        # Acquire the lock to prevent concurrent access to the log file
        with open(log_filename, "w") as log_file:
            # Check if the log file already exists
            if os.path.exists(log_filename):
                app.logger.warning("Log file already exists; skipping log creation.")
            else:
                # Create a new FileHandler for this request
                file_handler = logging.FileHandler(log_filename)

                # Configure the log format, level, and attach the handler to the logger
                formatter = logging.Formatter("%(asctime)s - %(levelname)s - %(message)s")
                file_handler.setFormatter(formatter)
                file_handler.setLevel(logging.DEBUG)
                app.logger.addHandler(file_handler)

                # Log a message
                app.logger.info("This log message will be written to a new file.")

                # Remove the handler from the logger to prevent further writing
                app.logger.removeHandler(file_handler)

                # Close the handler to release the log file
                file_handler.close()

        # Now, you can safely read the log file without further writing
        with open(log_filename, 'r') as file:
            log_contents = file.read()

    finally:
        # Remove the lock file to indicate that the request has completed
        os.remove(lock_file_path)

    return "Request processed successfully."

if __name__ == '__main__':
    app.run()