from time import *
import paramiko
# 定義一個類，表示一臺遠端linux主機
class Linux(object):
  # 通過IP, 用戶名，密碼，超時時間初始化一個遠程Linux主機
  def __init__(self, ip, username, password, timeout=30):
    self.ip = ip
    self.username = username
    self.password = password
    self.timeout = timeout
    # transport和chanel
    self.t = ''
    self.chan = ''
    # 鏈接失敗的重試次數
    self.try_times = 3
 
  # 調用該方法連接遠程主機
  def connect(self):
    while True:
      # 連接過程中可能會拋出異常，比如網絡不通、鏈接超時
      try:
        self.t = paramiko.Transport(sock=(self.ip, 22))
        self.t.connect(username=self.username, password=self.password)
        self.chan = self.t.open_session()
        self.chan.settimeout(self.timeout)
        self.chan.get_pty()
        self.chan.invoke_shell()
        # 如果沒有拋出異常說明連接成功，直接返回
        print('連接%s成功' % self.ip)
        # 接收到的網絡數據解碼為str
        print(self.chan.recv(65535).decode('utf-8'))
        return
      # 這里不對可能的異常如socket.error, socket.timeout細化，直接一網打盡
      except Exception as e1:
        if self.try_times != 0:
          print('連接%s失敗，進行重試' % self.ip)
          self.try_times -= 1
        else:
          print('重試3次失敗，結束程序')
          exit(1)
 
  # 斷開連接
  def close(self):
    self.chan.close()
    self.t.close()
 
  # 發(fā)送要執(zhí)行的命令
  def send(self, cmd):
    cmd += '\r'
    result = ''
    # 發(fā)送要執(zhí)行的命令
    self.chan.send(cmd)
    # 回顯很長的命令可能執(zhí)行較久，通過循環(huán)分批次取回回顯,執(zhí)行成功返回true,失敗返回false
    while True:
      sleep(0.5)
      ret = self.chan.recv(65535)
      ret = ret.decode('utf-8')
      result += ret
      return result
  '''
  發(fā)送文件
  @:param upload_files上傳文件路徑 例如：/tmp/test.py
  @:param upload_path 上傳到目標路徑 例如：/tmp/test_new.py
  '''
  def upload_file(self,upload_files,upload_path):
    try:
      tran=paramiko.Transport(sock=(self.ip, self.port))
      tran.connect(username=self.username, password=self.password)
      sftp = paramiko.SFTPClient.from_transport(tran)
      result=sftp.put(upload_files, upload_path)
      return True if result else False
    except Exception as ex:
      print(ex)
      tran.close()
    finally:
      tran.close()
 
 
# 連接正常的情況
if __name__ == '__main__':
  host = Linux('192.168.16.57', 'root', '+B*A15*EFpKG') # 傳入Ip，用戶名，密碼
  host.connect()
  # result = host.send('ls') # 發(fā)送一個查看ip的命令
  def input_cmd(str):
    return input(str)
  tishi_msg="輸入命令："
  while True:
    msg=input(tishi_msg)
    if msg=="exit":
      host.close()
      break
    else:
      res=host.send(msg)
      data=res.replace(res.split("\n")[-1],"")
      tishi_msg=res.split("\n")[-1]
      print(res.split("\n")[-1] + data.strip("\n"))