三、Python日志系统之监控邮件发送

import smtplib
from email.mime.text import MIMEText
import time
import os
import datetime
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler# 邮件配置
SMTP_SERVER = 'smtp.example.com'
SMTP_PORT = 587
SMTP_USERNAME = '[e-mail]'
SMTP_PASSWORD = 'your_password'
EMAIL_FROM = '[e-mail]'
EMAIL_TO = '[e-mail]'class LogFileHandler(FileSystemEventHandler):def __init__(self, log_file):self.log_file = log_filedef on_modified(self, event):if event.src_path == self.log_file and event.event_type == 'modified':with open(self.log_file, 'r') as f:lines = f.readlines()for line in lines:if "ERROR" in line:self.send_email(line.strip())def send_email(self, error_message):subject = 'Error Alert'body = f'Error message: {error_message}'msg = MIMEText(body)msg['Subject'] = subjectmsg['From'] = EMAIL_FROMmsg['To'] = EMAIL_TOtry:server = smtplib.SMTP(SMTP_SERVER, SMTP_PORT)server.starttls()server.login(SMTP_USERNAME, SMTP_PASSWORD)server.sendmail(EMAIL_FROM, [EMAIL_TO], msg.as_string())server.quit()print("Email notification sent successfully.")except Exception as e:print(f"Failed to send email notification: {e}")# 示例用法
if __name__ == "__main__":# 创建监控程序实例base_dir = os.path.dirname(os.path.abspath(__file__))log_dir = os.path.join(base_dir, "logs")log_file = datetime.datetime.now().strftime("%Y-%m-%d") + ".log"log_path = os.path.join(log_dir, log_file)if not os.path.exists(log_path):with open(log_path, 'w') as f:f.write("INFO: This is an info message.\n")f.write("WARNING: This is a warning message.\n")f.write("ERROR: This is an error message.\n")f.write("ERROR: Another error message.\n")f.write("INFO: Another info message.\n")observer = Observer()observer.schedule(LogFileHandler(log_path), os.path.dirname(log_path))observer.start()print(f"Started monitoring {log_path} for errors...")try:while True:time.sleep(1)except KeyboardInterrupt:observer.stop()observer.join()

邮件配置：

设置了 SMTP 服务器地址、端口、用户名、密码等信息，用于发送邮件。
send_email 方法：

当监控到含有 “ERROR” 字符串的日志行时，调用 send_email 方法发送邮件通知。
示例用法：

在 main 中启动监控程序，监听日志文件，并且每当发现含有 “ERROR” 的日志行时，发送邮件通知。
请确保将 SMTP_SERVER、SMTP_PORT、SMTP_USERNAME、SMTP_PASSWORD、EMAIL_FROM 和 EMAIL_TO 替换为你实际的邮件服务器和邮箱地址。这样，当日志文件被修改并包含错误消息时，你会收到邮件通知。