paramiko操作服务器查询cpu，内存，磁盘使用情况

# -*- coding: utf-8 -*-
import paramiko


# @Singleton
class SSHLinuxClient(object):
    def __init__(self, hostname, port, username, password, key_filename):
        self.hostname = hostname
        self.port = port
        self.username = username
        self.password = password
        self.key_filename = key_filename
        self.connections = list()

    def __enter__(self):
        client = paramiko.SSHClient()
        client.set_missing_host_key_policy(paramiko.AutoAddPolicy)
        client.connect(hostname=self.hostname, port=self.port, username=self.username, key_filename=self.key_filename)
        self.connections.append(client)
        return client

    def __exit__(self, exc_ty, exc_val, tb):
        self.connections.pop().close()

class ServiceClient:

    def __new__(cls, *args, **kwargs):
        if not hasattr(cls, '_instance'):
            cls._instance = super(ServiceClient, cls).__new__(cls)
            # 阿里云账号AccessKey拥有所有API的访问权限，风险很高。强烈建议您创建并使用RAM用户进行API访问或日常运维，请登录RAM控制台创建RAM用户。
            cls._instance.ssh_client = SSHLinuxClient(hostname=DefaultConfig.SSH_HOST, port=DefaultConfig.SSH_PORT,
                                                      username=DefaultConfig.SSH_USERNAME,
                                                      password=DefaultConfig.SSH_PASSWORD,
                                                      key_filename=DefaultConfig.SSH_FILENAME_PATH)
        return cls._instance

    # 内存使用率
    def service_ram_rate(self):
        with self.ssh_client as ssh:
            ram = ssh_command(ssh, SSH_COMMAND['ram'])
            service_ram = ram.split('\n')
            # ram_use = int(service_ram[2])
            # ram_all = int(service_ram[1])
            # ram_rate = int(ram_use / ram_all * 100)
            for line in service_ram:
                if line.startswith('MemTotal:'):
                    mem_total = int(line.split()[1])
                elif line.startswith('MemFree:'):
                    mem_free = int(line.split()[1])
                elif line.startswith('Buffers:'):
                    mem_buffer = int(line.split()[1])
                elif line.startswith('Cached:'):
                    mem_cache = int(line.split()[1])
                elif line.startswith('SwapTotal:'):
                    vmem_total = int(line.split()[1])
                elif line.startswith('SwapFree:'):
                    vmem_free = int(line.split()[1])
                else:
                    continue
            physical_percent = self.usage_percent(mem_total - (mem_free + mem_buffer + mem_cache), mem_total)
            virtual_percent = 0
            if vmem_total > 0:
                virtual_percent = self.usage_percent((vmem_total - vmem_free), vmem_total)
            return mem_total, physical_percent, virtual_percent
        # return ram_rate

    @staticmethod
    def usage_percent(use, total):
        try:
            ret = (float(use) / total) * 100
        except ZeroDivisionError:
            raise Exception("ERROR - zero division error")
        return ret

    # cpu使用率
    def service_cpu_rate(self):
        last_work_time = 0
        last_idle_time = 0
        with self.ssh_client as ssh:
            cpu = ssh_command(ssh, SSH_COMMAND['cpu'])
            service_cpu = cpu.split('\n')
            line = ''
            for cpu in service_cpu:
                if 'cpu' in cpu:
                    line = cpu
                    break
            # line = ''
            # f = open('1.txt', 'r')
            # while not "cpu " in line: line = f.readline()
            spl = line.split(" ")
            work_time = int(spl[2]) + int(spl[3]) + int(spl[4])
            idle_time = int(spl[5])
            d_work_time = (work_time - last_work_time)
            d_idle_time = (idle_time - last_idle_time)
            rate = float(d_work_time) / (d_idle_time + d_work_time)
            last_work_time = work_time
            if last_work_time == 0:
                return 0
        return rate * 100

    # 返回总 和 使用率
    def service_disk_rate(self):
        disk_size = 0
        disk_size_use = 0
        with self.ssh_client as ssh:
            disk = ssh_command(ssh, SSH_COMMAND['disk'])
            service_disk_list = disk.split('\n')[1:]
            service_disk_list = [disk for disk in filter(lambda x: x != '', service_disk_list)]
            for service_disk in service_disk_list:
                disk_list = [disk for disk in filter(lambda x: x != '', service_disk.split(' '))]
                disk_size += int(disk_list[1])
                disk_size_use += int(disk_list[2])

        return disk_size, disk_size_use / disk_size

    # cpu配置及数量
    def service_cpu_count(self):
        cpu = str()
        with self.ssh_client as ssh:
            cpu_config_list = ssh_command(ssh, SSH_COMMAND['cpu_config']).split('\n')
            for cpu_config in cpu_config_list:
                if 'model name' in cpu_config:
                    model_name = cpu_config.split('    : ')[1]
                    cpu += model_name
                elif 'cpu cores' in cpu_config:
                    cpu_cores = cpu_config.split(' : ')[1]
                    cpu += ' * ' + cpu_cores
        return cpu

# ssh相关命令
SSH_COMMAND = {
    'cpu': 'cat /proc/stat',
    'ram': 'cat /proc/meminfo',
    'disk': 'df',
    'cpu_config': 'cat /proc/cpuinfo',
}