# Import built-in function

# Import third-party pakages
import paramiko


class SSHConnection(object):
	_timeout = 300.0  # connection timeout

	def __init__(self, **kwargs):
		super(SSHConnection, self).__init__()

		# Note : use '__' to make member as private variable or method that cannot access from outside
		self.hostname = kwargs.get("hostname", 'localhost')
		self.port = int(kwargs.get('port', '22'))
		self.__username = kwargs.get("username", '')
		self.__password = kwargs.get("password", '')

		self.__ssh = paramiko.SSHClient()
		self.__ssh.set_missing_host_key_policy(paramiko.MissingHostKeyPolicy) # avoid Exception from missing known_hosts

		if all(x != '' for x in (self.__username, self.__password)):
			self.connect()

	def connect(self):
		self.__ssh.connect(hostname=self.hostname,
		                   port=self.port,
		                   username=self.__username,
		                   password=self.__password,
		                   timeout=self._timeout)
		return self.__ssh

	def runCommand(self, command):
		ssh_stdin, ssh_stdout, ssh_stderr = self.__ssh.exec_command("echo %s| sudo -S %s"%(self.__password, command))
		print ssh_stdout.read()
		print ssh_stderr.read()

	def close(self):
		self.__ssh.close()

if __name__ == '__main__':
	ssh = SSHConnection(username='user', password='password', hostname='localhost', port = 22)
	ssh.runCommand('ls -l /tmp')
	ssh.close()