0-stats.py

#!/usr/bin/python3
"""
Processing stdin line by line and calculating metrics.

This script reads input lines from stdin, parses them,
and computes metrics such as file size and HTTP status code occurrences.

It prints statistics in ascending order,
including the file size and the count of each HTTP status code encountered.

Usage:
    ./0-generator.py | ./0-stats.py
"""


if __name__ == "__main__":
    import sys

    status_code_counts = {
        "200": 0,
        "301": 0,
        "400": 0,
        "401": 0,
        "403": 0,
        "404": 0,
        "405": 0,
        "500": 0,
    }
    log_entry_count = 1
    file_size = 0

    def parse_line(log_entry):
        """
        Read, parse, and extract relevant data from a given log entry.

        Args:
            log_entry (str): A log entry to be parsed.

        Returns:
            int: The size of the file indicated in the log entry.
        """
        try:
            parsed_entry = log_entry.split()
            status_code = parsed_entry[-2]
            if status_code in status_code_counts.keys():
                status_code_counts[status_code] += 1
            return int(parsed_entry[-1])
        except Exception:
            return 0

    def print_stats():
        """
        Print statistics in ascending order based on HTTP status codes.

        Prints the total file size and the log_entry_count
        of each HTTP status code encountered.
        """
        print(f"File size: {file_size}")
        for key in sorted(status_code_counts.keys()):
            if status_code_counts[key]:
                print(f"{key}: {status_code_counts[key]}")

    try:
        for log_entry in sys.stdin:
            file_size += parse_line(log_entry)
            if log_entry_count % 10 == 0:
                print_stats()
            log_entry_count += 1
    except KeyboardInterrupt:
        print_stats()
        raise
    print_stats()