python连接Linux读取日志

import paramiko

from common import load_file

yaml_dict = load_file.get_root_yaml()
linux_info = yaml_dict["linux_db_info"]


class SSH:
    def __init__(self):
        self.ip = yaml_dict["linux_db_info"]["host"]
        self.user = yaml_dict["linux_db_info"]["user"]
        self.password = yaml_dict["linux_db_info"]["password"]
        self.port = yaml_dict["linux_db_info"]["port"]
        # 链接失败的重试次数
        self.try_times = 3

    def connect_server(self):
        while True:
            try:
                self.ssh = paramiko.SSHClient()  # 创建SSHClient 实例对象
                self.ssh.set_missing_host_key_policy(
                    paramiko.AutoAddPolicy())  # 调用方法，表示没有存储远程机器的公钥，允许访问
                print('------------开始连接服务器(%s)-----------' % self.ip)
                self.ssh.connect(self.ip, self.port, username=self.user,
                                 password=self.password)  # 连接远程机器，地址，端口，用户名密码
                print('------------连接服务器成功!.....-----------')
                return
            except Exception:
                if self.try_times != 0:
                    print(f'连接远程linux服务器(ip:{self.ip})失败，进行重试!')
                    self.try_times -= 1
                else:
                    print(u'重试3次失败，结束程序')
                    exit(1)

    def exec_commands(self, cmd):
        stdin, stdout, stderr = self.ssh.exec_command(cmd)  # stdout 为正确输出，stderr为错误输出
        # results = str(stdout.read()).encode(encoding="utf-8").decode()
        # print(stdout.read())
        # print(type(stdout.read()))
        results = stdout.read().decode("utf-8")
        print("----",results)
        # error_mess = str(stderr.read())
        return results

def get_grep_num(grep_log,modle_log="core"):
    ssh = SSH()
    ssh.connect_server()
    cmd = f"cd /data/workspace/nova-iwms-{modle_log}/logs/;cat iwms-{modle_log}_info.log |grep '{grep_log}'|wc -l"
    print_str = ssh.exec_commands(cmd)
    return print_str


if __name__ == '__main__':
    get_grep_num("封箱提示，接口通知系统配置未打开。")
    # host=SSH()
    # host.connect_server()
    # cmd="cd /data/workspace/nova-iwms-station/logs/;cat iwms-station.log |tail -1"
    # res = host.exec_commands(cmd)
    # if "发送电子标签指令" in res:
    #     print(111)

 查看操作有无日志产生：

1、在操作前查看日志数量

2、操作动作

3、在操作后查看日志数量

4、判断数量增加了则有产生日志