任务：应帅气的领导要求，需要监控生产环境mysql和mongo数据库服务。不仅要connect successful还要进行数据交互进一步确认数据库服务正常。

思路：
mysql和mongo 数据库ip、端口、用户名、密码、认证库（mongo）分别写在mysqldb_message.txt和mongodb_message.txt两个文件中。查询脚本db_test.py,邮件脚本sendEmail.py
.
.

格式如下：

mysqldb_message.txt
host:192.168.0.32 user:test passwd:123456 port:3306
host:192.168.0.222 user:test passwd:123456 port:3307
host:192.168.1.101 user:cctest passwd:Yj7netlkj port:3990

.
.

mongodb_message.txt
host:192.168.1.101 user:errorbook passwd:wangyue port:37017 authDB:admin
host:127.0.0.1 user:qingcong passwd:qingcong port:27017 authDB:admin
.
.
查询脚本db_test.py:
需要注意的是：

.
1、由于Python3.6，pymongo模块中的MongoClient函数连接mongo数据库时，超时参数connecttimeOutMS并不会生效（亲测）,并且如果仅仅用MongoClient连接mongo数据库而不对数据库内的数据进行交互，那么无论MongoClient返回的是正确的连接对象还是发生了错误，Python3.6均不会报错。所以，必须要对数据库数据进行交互，才能确定数据库服务是否正常
.
2、由于mongo超时时间大概在30多秒左右，因此引入Python提供的超时函数timeout_decorator.timeout()，但此函数对不同的操作系统用法不一样。此脚本在windows环境下运行会报错。

#!/usr/bin/env python
#encoding: utf-8
#author: 847907826@qq.com
#注意，需要在Linux环境下Python3以上版本执行，且需要安装pymysql、pymongo、timeout_decorator模块

import re
import time
import pymysql
import timeout_decorator
from pymongo import MongoClient
import sys
sys.path.append('/tools/scripts')   # /tools/scripts脚本目录，导入进sys.path中为后续才能调用send_mail函数
from sendEmail import send_mail     

#定义host、user、passwd、port、auth_db列表，用与存储数据库信息
host = []
user = []
passwd = []
port = []
auth_db = []

#mysql配置信息文件路径
mysql_file = '/tools/scripts/mysqldb_message.txt'
#data format: host:192.168.1.101 user:errorbook passwd:wangyue port:37017 authDB:admin

mongo_file = '/tools/scripts/mongodb_message.txt'
# data format: host:172.17.0.2 user:root passwd:123456 port:3306

#获取mysql_db的配置信息
def get_message_mysqldb():
        print("读取mysql数据库详细信息文件中，请稍后....")
        # time.sleep(1)
        with open(mysql_file, 'r') as source:
                lines = source.read().splitlines()  # splitlines 去除空行，即不保留每行结尾的\n，否则读取的每行中末尾均有\n
                i = 0
                for char in lines:
                        if char.strip() != '':  # 去掉字符串前后的空格
                                char = re.split('[ :]', lines[i])  # 以空格和分号作为空格符进行分割
                                num = 1
                                host.append(char[num])
                                user.append(char[num + 2])
                                passwd.append(char[num + 4])
                                port.append(char[num + 6])
                        i = i + 1
        print("读取完成\n---------------------------")
        return host, user, passwd, port

#获取mongodb_db的配置信息
def get_message_mongodb():
        with open(mongo_file, 'r') as source:
                lines = source.read().splitlines()
                i = 0
                for char in lines:
                        if char.strip() != '':  # 去掉字符串前后的空格
                                char = re.split('[ :]', lines[i])  # 以空格和分号作为空格符进行分割
                                num = 1
                                host.append(char[num])
                                user.append(char[num + 2])
                                passwd.append(char[num + 4])
                                port.append(char[num + 6])
                                auth_db.append(char[num + 8])
                        i = i + 1
        return host, user, passwd, port, auth_db

#连接mysql数据库
def mysqldb_connect_and_test(ip, user, passwd, port):
        print("连接mysql数据库{0}中，请稍后....".format(ip))
        # time.sleep(1)
        try:
                # print("ip:{0}, user:{1}, passwd:{2}, port:{3}".format(ip, user, passwd, port))
                conn = pymysql.connect(host=ip,
                                                             user=user,
                                                             passwd=passwd,
                                                             port=int(port),
                                                             charset='utf8',
                                                             connect_timeout=3)
                print("连接成功，执行测试语句中...")
                with conn.cursor() as cur:
                        sql = 'select 1 from dual'
                        a = str(cur.execute(sql))
                        print("successful! 进一步确认数据库服务正常。执行结果-->a: {0}".format(a))

        except Exception:
                print("发生异常,数据库连接失败，服务器ip：{0}".format(ip), Exception)
                send_mail("监控中心<monitor@7net.cc>", ["吴青聪<qingcong@7net.cc>"], [], "测试email", "（测试）邮件内容：python检测到mysql数据库异常，服务器为{0}".format(host), "")
        else:
                print("连接成功：{0}\n".format(ip))

#连接mongodb数据库
@timeout_decorator.timeout(3)
def mongodb_connect_and_test(ip, user, passwd, port, auth_db):
        print("请稍等，连接mongodb中...")
        try:
                client = MongoClient(ip, int(port))
                # 利用server_info()判断mongodb状态
                dbnames = client.server_info()  #
                print(dbnames)
                #利用authenticate判断mongodb状态
                db = client[auth_db]
                result = db.authenticate(user, passwd)

        except Exception as es:
                print("Error！连接失败，服务器ip：{0}".format(ip), es)
                send_mail("监控中心<monitor@7net.cc>", ["吴青聪<qingcong@7net.cc>"], [], "测试email", "（测试）邮件内容：python检测到mongo数据库异常，服务器为{0}".format(host), "")
        else:
                print("Successful！连接mongodb成功，测试语句执行成功")
                client.close()

#清空列表变量
def clear_list():
        host.clear()
        user.clear()
        passwd.clear()
        port.clear()

def main():
        # 检查mysql
        print("检查mysql数据库：")
        get_message_mysqldb()
        index = 0
        for ip in host:
                print("------------------------")
                mysqldb_connect_and_test(ip, user[index], passwd[index], port[index]) 
                index = index + 1

        clear_list()  # 清空变量列表

        #检查mongodb
    print("\n检查mysql数据库：")
        get_message_mongodb()
        index = 0
        for ip in host:
                print("------------------------")
                # print("ip:{0}, user:{1}, passwd:{2}, port:{3}".format(ip, user[index], passwd[index], port[index]))
                mongodb_connect_and_test(ip, user[index], passwd[index], port[index], auth_db[index])
                index = index + 1

if __name__ == '__main__':
        main()

发送邮件脚本sendEmail.py:

#!/usr/bin/env python
#encoding: utf-8

import smtplib  # 加载smtplib模块
import traceback
from email.header import Header
from email.mime.application import MIMEApplication
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.utils import parseaddr, formataddr

login_name = 'monitor@7net.cc'  # 发件人邮箱账号，为了后面易于维护，所以写成了变量
login_pass = '******'           # 邮箱密码，此处隐藏^_^
smtp_port = 465

def _format_addr(s):
name, addr = parseaddr(s)
return formataddr(( \
        Header(name, 'utf-8').encode(), \
        addr))
# addr.encode('utf-8') if isinstance(addr, unicode) else addr))

def send_mail(sender, recps, Ccs, subject, htmlmsg, fileAttachment):
# 参数分别是：发送人邮箱、收件人邮箱、抄送人邮箱、主题、内容、附件，如果看不懂此处代码，知道如何使用即可

smtpserver = 'smtp.exmail.qq.com'

receivers = recps + Ccs

try:
        # msg = MIMEText(htmlmsg, 'html', 'utf-8')
        msg = MIMEMultipart()

        msg.attach(MIMEText(htmlmsg, 'html', 'utf-8'))

        # msg['Subject'] = subject
        msg['Subject'] = Header(subject, 'utf-8').encode()
        # msg['From'] = sender
        msg['From'] = _format_addr(sender)

        Recp = []
        for recp in recps:
                Recp.append(_format_addr(recp))

        ccs = []
        for cc in Ccs:
                ccs.append(_format_addr(cc))

        msg['To'] = ','.join(Recp)
        msg['Cc'] = ','.join(ccs)

        # if fileAttachment!='' :
        #     # 附件
        for file in fileAttachment:
                part = MIMEApplication(open(file, 'rb').read())
                attFileName = file.split('/')[-1]
                part.add_header('Content-Disposition', 'attachment', filename=attFileName)
                msg.attach(part)
        # part = MIMEApplication(open(fileAttachment, 'rb').read())
        # part.add_header('Content-Disposition', 'attachment', filename=fileAttachment)
        # msg.attach(part)

        smtp = smtplib.SMTP_SSL()
        smtp.connect(smtpserver, smtp_port)
        smtp.login(login_name, login_pass)
        #      smtp.login(username, password)
        smtp.sendmail(sender, receivers, msg.as_string())
        smtp.quit()
        print('SendEmail success')
except:
        traceback.print_exc()