# limitations under the License.
import StringIO
-from time import time
+from time import time, sleep
import socket
import paramiko
from paramiko import RSAKey
+from paramiko.ssh_exception import SSHException
from scp import SCPClient
from interruptingcow import timeout
from robot.api import logger
def __init__(self):
self._ssh = None
+ self._node = None
@staticmethod
def _node_hash(node):
If there already is a connection to the node, this method reuses it.
"""
+ self._node = node
node_hash = self._node_hash(node)
if node_hash in SSH.__existing_connections:
self._ssh = SSH.__existing_connections[node_hash]
"""
node_hash = self._node_hash(node)
if node_hash in SSH.__existing_connections:
+ logger.debug('Disconnecting peer: {}, {}'.
+ format(node['host'], node['port']))
ssh = SSH.__existing_connections.pop(node_hash)
ssh.close()
+ def _reconnect(self):
+ node = self._node
+ self.disconnect(node)
+ self.connect(node)
+ logger.debug('Reconnecting peer done: {}'.
+ format(self._ssh.get_transport().getpeername()))
+
def exec_command(self, cmd, timeout=10):
"""Execute SSH command on a new channel on the connected Node.
- Returns (return_code, stdout, stderr).
+ :param cmd: Command to run on the Node.
+ :param timeout: Maximal time in seconds to wait while the command is
+ done. If is None then wait forever.
+ :type cmd: str
+ :type timeout: int
+ :return return_code, stdout, stderr
+ :rtype: tuple(int, str, str)
+ :raise socket.timeout: If command is not finished in timeout time.
"""
+ start = time()
+ stdout = StringIO.StringIO()
+ stderr = StringIO.StringIO()
+ try:
+ chan = self._ssh.get_transport().open_session(timeout=5)
+ except AttributeError:
+ self._reconnect()
+ chan = self._ssh.get_transport().open_session(timeout=5)
+ except SSHException:
+ self._reconnect()
+ chan = self._ssh.get_transport().open_session(timeout=5)
+ chan.settimeout(timeout)
logger.trace('exec_command on {0}: {1}'
.format(self._ssh.get_transport().getpeername(), cmd))
- start = time()
- chan = self._ssh.get_transport().open_session()
- if timeout is not None:
- chan.settimeout(int(timeout))
+
chan.exec_command(cmd)
+ while not chan.exit_status_ready() and timeout is not None:
+ if chan.recv_ready():
+ stdout.write(chan.recv(self.__MAX_RECV_BUF))
+
+ if chan.recv_stderr_ready():
+ stderr.write(chan.recv_stderr(self.__MAX_RECV_BUF))
+
+ if time() - start > timeout:
+ raise socket.timeout(
+ 'Timeout exception.\n'
+ 'Current contents of stdout buffer: {0}\n'
+ 'Current contents of stderr buffer: {1}\n'
+ .format(stdout.getvalue(), stderr.getvalue())
+ )
+
+ sleep(0.1)
+ return_code = chan.recv_exit_status()
+
+ while chan.recv_ready():
+ stdout.write(chan.recv(self.__MAX_RECV_BUF))
+
+ while chan.recv_stderr_ready():
+ stderr.write(chan.recv_stderr(self.__MAX_RECV_BUF))
+
end = time()
logger.trace('exec_command on {0} took {1} seconds'.format(
self._ssh.get_transport().getpeername(), end-start))
- stdout = ""
- try:
- while True:
- buf = chan.recv(self.__MAX_RECV_BUF)
- stdout += buf
- if not buf:
- break
- except socket.timeout:
- logger.error('Caught timeout exception, current contents '
- 'of buffer: {0}'.format(stdout))
- raise
-
- stderr = ""
- while True:
- buf = chan.recv_stderr(self.__MAX_RECV_BUF)
- stderr += buf
- if not buf:
- break
-
- return_code = chan.recv_exit_status()
logger.trace('chan_recv/_stderr took {} seconds'.format(time()-end))
logger.trace('return RC {}'.format(return_code))
- logger.trace('return STDOUT {}'.format(stdout))
- logger.trace('return STDERR {}'.format(stderr))
- return return_code, stdout, stderr
+ logger.trace('return STDOUT {}'.format(stdout.getvalue()))
+ logger.trace('return STDERR {}'.format(stderr.getvalue()))
+ return return_code, stdout.getvalue(), stderr.getvalue()
- def exec_command_sudo(self, cmd, cmd_input=None, timeout=10):
+ def exec_command_sudo(self, cmd, cmd_input=None, timeout=30):
"""Execute SSH command with sudo on a new channel on the connected Node.
:param cmd: Command to be executed.
logger.trace('SCP took {0} seconds'.format(end-start))
-def exec_cmd(node, cmd, timeout=None, sudo=False):
+def exec_cmd(node, cmd, timeout=600, sudo=False):
"""Convenience function to ssh/exec/return rc, out & err.
Returns (rc, stdout, stderr).
ssh.connect(node)
except Exception, e:
logger.error("Failed to connect to node" + str(e))
- return None
+ return None, None, None
try:
if not sudo:
timeout=timeout)
except Exception, e:
logger.error(e)
- return None
+ return None, None, None
return ret_code, stdout, stderr
-def exec_cmd_no_error(node, cmd, timeout=None, sudo=False):
+def exec_cmd_no_error(node, cmd, timeout=600, sudo=False):
"""Convenience function to ssh/exec/return out & err.
Verifies that return code is zero.
Code Review / csit.git / commitdiff