Bài 7: File Handling

💡 Giải pháp:

import os
from datetime import datetime
from collections import Counter

def create_sample_log():
    """Tạo file log mẫu để test"""
    log_entries = [
        "2024-01-15 10:30:15 INFO User login: user123",
        "2024-01-15 10:31:22 ERROR Database connection failed",
        "2024-01-15 10:32:10 INFO User logout: user123",
        "2024-01-15 10:35:45 WARNING Low disk space",
        "2024-01-15 10:40:12 ERROR File not found: config.txt",
        "2024-01-15 10:42:33 INFO User login: user456",
        "2024-01-15 10:45:18 ERROR Network timeout"
    ]
    
    with open('sample.log', 'w', encoding='utf-8') as f:
        for entry in log_entries:
            f.write(entry + '\n')
    print("Đã tạo file sample.log")

def analyze_log(filename):
    """Phân tích log file"""
    if not os.path.exists(filename):
        print(f"File {filename} không tồn tại!")
        return
    
    log_levels = Counter()
    error_messages = []
    user_activities = []
    
    try:
        with open(filename, 'r', encoding='utf-8') as f:
            for line_num, line in enumerate(f, 1):
                line = line.strip()
                if not line:
                    continue
                
                parts = line.split(' ', 3)
                if len(parts) >= 3:
                    date_str = parts[0]
                    time_str = parts[1]
                    level = parts[2]
                    message = parts[3] if len(parts) > 3 else ""
                    
                    log_levels[level] += 1
                    
                    if level == "ERROR":
                        error_messages.append(f"Line {line_num}: {message}")
                    
                    if "User" in message:
                        user_activities.append(f"{date_str} {time_str}: {message}")
        
        # Tạo báo cáo
        create_report(log_levels, error_messages, user_activities)
        
    except Exception as e:
        print(f"Lỗi đọc file: {e}")

def create_report(log_levels, errors, activities):
    """Tạo báo cáo phân tích"""
    report_filename = f"log_report_{datetime.now().strftime('%Y%m%d_%H%M%S')}.txt"
    
    with open(report_filename, 'w', encoding='utf-8') as f:
        f.write("=== BÁO CÁO PHÂN TÍCH LOG ===\n")
        f.write(f"Thời gian tạo: {datetime.now()}\n\n")
        
        f.write("1. THỐNG KÊ LOG LEVELS:\n")
        for level, count in log_levels.most_common():
            f.write(f"   {level}: {count}\n")
        
        f.write(f"\n2. ERRORS ĐƯỢC TÌM THẤY ({len(errors)}):\n")
        for error in errors:
            f.write(f"   {error}\n")
        
        f.write(f"\n3. HOẠT ĐỘNG USER ({len(activities)}):\n")
        for activity in activities:
            f.write(f"   {activity}\n")
    
    print(f"Đã tạo báo cáo: {report_filename}")

# Main program
print("=== LOG ANALYZER ===")
print("1. Tạo file log mẫu")
print("2. Phân tích log file")

choice = input("Chọn: ")
if choice == "1":
    create_sample_log()
elif choice == "2":
    filename = input("Tên file log: ")
    analyze_log(filename)