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#!/usr/bin/env python
# Copyright (c) 2017 Okinawa Open Laboratory and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
"""ssh client module for vrouter testing"""
import logging
import time
import yaml
import paramiko
from functest.opnfv_tests.vnf.router.utilvnf import Utilvnf
RECEIVE_ROOP_WAIT = 1
DEFAULT_CONNECT_TIMEOUT = 10
DEFAULT_CONNECT_RETRY_COUNT = 10
DEFAULT_SEND_TIMEOUT = 10
class SshClient(object): # pylint: disable=too-many-instance-attributes
"""ssh client class for vrouter testing"""
logger = logging.getLogger(__name__)
def __init__(self, ip_address, user, password=None, key_filename=None):
self.ip_address = ip_address
self.user = user
self.password = password
self.key_filename = key_filename
self.connected = False
self.shell = None
self.logger.setLevel(logging.INFO)
self.ssh = paramiko.SSHClient()
self.ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
self.util = Utilvnf()
with open(self.util.test_env_config_yaml) as file_fd:
test_env_config_yaml = yaml.safe_load(file_fd)
file_fd.close()
self.ssh_revieve_buff = test_env_config_yaml.get("general").get(
"ssh_receive_buffer")
def connect(self, time_out=DEFAULT_CONNECT_TIMEOUT,
retrycount=DEFAULT_CONNECT_RETRY_COUNT):
# pylint: disable=missing-docstring
while retrycount > 0:
try:
self.logger.info("SSH connect to %s.", self.ip_address)
self.ssh.connect(self.ip_address,
username=self.user,
password=self.password,
key_filename=self.key_filename,
timeout=time_out,
look_for_keys=False,
allow_agent=False)
self.logger.info("SSH connection established to %s.",
self.ip_address)
self.shell = self.ssh.invoke_shell()
while not self.shell.recv_ready():
time.sleep(RECEIVE_ROOP_WAIT)
self.shell.recv(self.ssh_revieve_buff)
break
except Exception: # pylint: disable=broad-except
self.logger.info("SSH timeout for %s...", self.ip_address)
time.sleep(time_out)
retrycount -= 1
if retrycount == 0:
self.logger.warn(
"Cannot establish connection to IP '%s'", self.ip_address)
self.connected = False
return self.connected
self.connected = True
return self.connected
def send(self, cmd, prompt, timeout=DEFAULT_SEND_TIMEOUT):
# pylint: disable=missing-docstring
if self.connected is True:
self.shell.settimeout(timeout)
self.logger.debug("Commandset : '%s'", cmd)
try:
self.shell.send(cmd + '\n')
except Exception: # pylint: disable=broad-except
self.logger.error("ssh send timeout : Command : '%s'", cmd)
return None
res_buff = ''
while not res_buff.endswith(prompt):
time.sleep(RECEIVE_ROOP_WAIT)
try:
res = self.shell.recv(self.ssh_revieve_buff)
except Exception: # pylint: disable=broad-except
self.logger.error("ssh receive timeout : Command : '%s'",
cmd)
break
res_buff += res.decode()
self.logger.debug("Response : '%s'", res_buff)
return res_buff
self.logger.error("Cannot connected to IP '%s'.", self.ip_address)
return None
def close(self):
# pylint: disable=missing-docstring
if self.connected is True:
self.ssh.close()
@staticmethod
def error_check(response, err_strs=None):
# pylint: disable=missing-docstring
if err_strs is None:
err_strs = ["error", "warn", "unknown command", "already exist"]
for err in err_strs:
if err in response:
return False
return True
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