fb96dae446
* Added command to replace strings in remote file using sed Change-Id: I78ebfc16d8164fa5fb175a8ebaff1a3248970ea3
152 lines
4.7 KiB
Python
152 lines
4.7 KiB
Python
# Copyright (c) 2013 Mirantis Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import contextlib
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import paramiko
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from savanna.utils import crypto
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def setup_ssh_connection(host, username, private_key):
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"""Setup SSH connection to the host using username and private key."""
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if type(private_key) in [str, unicode]:
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private_key = crypto.to_paramiko_private_key(private_key)
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ssh = paramiko.SSHClient()
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ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
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ssh.connect(host, username=username, pkey=private_key)
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return ssh
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def execute_command(ssh_connection, cmd):
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"""Execute specified command remotely using existing ssh connection.
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Return exit code and stdout data of the executed command.
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"""
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chan = ssh_connection.get_transport().open_session()
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chan.exec_command(cmd)
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retcode = chan.recv_exit_status()
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buf = ''
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while chan.recv_ready():
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buf += chan.recv(1024)
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return retcode, buf
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def write_file_to(sftp, remote_file, data):
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"""Create remote file using existing ssh connection and write the given
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data to it.
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"""
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fl = sftp.file(remote_file, 'w')
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fl.write(data)
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fl.close()
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def write_files_to(sftp, files):
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"""Copy file->data dictionary in a single ssh connection.
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"""
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for fl, data in files.iteritems():
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write_file_to(sftp, fl, data)
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def read_file_from(sftp, remote_file):
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"""Read remote file from the specified host and return given data."""
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fl = sftp.file(remote_file, 'r')
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data = fl.read()
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fl.close()
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return data
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def replace_remote_string(ssh_connection, remote_file, old_str, new_str):
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"""Replaces strings in remote file using sed command."""
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cmd = "sudo sed -i 's,%s,%s,g' %s" % (old_str, new_str, remote_file)
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return execute_command(ssh_connection, cmd)
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class InstanceInteropHelper(object):
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def __init__(self, instance):
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self.instance = instance
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def __enter__(self):
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self.bulk = BulkInstanceInteropHelper(self)
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return self.bulk
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def __exit__(self, *exc_info):
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self.bulk.close()
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def ssh_connection(self):
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return setup_ssh_connection(
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self.instance.management_ip, self.instance.username,
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self.instance.node_group.cluster.private_key)
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def execute_command(self, cmd):
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with contextlib.closing(self.ssh_connection()) as ssh:
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return execute_command(ssh, cmd)
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def write_file_to(self, remote_file, data):
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with contextlib.closing(self.ssh_connection()) as ssh:
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return write_file_to(ssh.open_sftp(), remote_file, data)
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def write_files_to(self, files):
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with contextlib.closing(self.ssh_connection()) as ssh:
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return write_files_to(ssh.open_sftp(), files)
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def read_file_from(self, remote_file):
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with contextlib.closing(self.ssh_connection()) as ssh:
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return read_file_from(ssh.open_sftp(), remote_file)
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def replace_remote_string(self, remote_file, old_str, new_str):
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with contextlib.closing(self.ssh_connection()) as ssh:
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return replace_remote_string(ssh, remote_file, old_str, new_str)
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class BulkInstanceInteropHelper(object):
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def __init__(self, helper):
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self.helper = helper
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self._ssh = None
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self._sftp = None
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def close(self):
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if self._sftp:
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self._sftp.close()
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if self._ssh:
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self._ssh.close()
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def ssh_connection(self):
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if not self._ssh:
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self._ssh = self.helper.ssh_connection()
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return self._ssh
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def sftp_connection(self):
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if not self._sftp:
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self._sftp = self.ssh_connection().open_sftp()
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return self._sftp
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def execute_command(self, cmd):
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return execute_command(self.ssh_connection(), cmd)
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def write_file_to(self, remote_file, data):
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return write_file_to(self.sftp_connection(), remote_file, data)
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def write_files_to(self, files):
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return write_files_to(self.sftp_connection(), files)
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def read_file_from(self, remote_file):
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return read_file_from(self.sftp_connection(), remote_file)
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def replace_remote_string(self, remote_file, old_str, new_str):
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return replace_remote_string(self.ssh_connection(), remote_file,
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old_str, new_str)
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