class Ssh(BaseDestination):
"""
SSH destination class
:param ssh_connect_info: SSH connection info
:type ssh_connect_info: SshConnectInfo
:param remote_path: Path to store backup
:param hostname: Hostname
"""
def __init__(self,
remote_path,
ssh_connect_info=SshConnectInfo(),
hostname=socket.gethostname()):
super(Ssh, self).__init__(remote_path)
self._ssh_client = SshClient(ssh_connect_info)
self.status_path = "{remote_path}/{hostname}/status".format(
remote_path=self.remote_path, hostname=hostname)
self.status_tmp_path = self.status_path + ".tmp"
def save(self, handler, name):
"""
Read from handler and save it on remote ssh server
:param name: relative path to a file to store the backup copy.
:param handler: stream with content of the backup.
"""
remote_name = self.remote_path + '/' + name
try:
self._mkdirname_r(remote_name)
except SshClientException as err:
LOG.error('Failed to create directory for %s: %s', remote_name,
err)
return False
try:
cmd = "cat - > %s" % remote_name
with self._ssh_client.get_remote_handlers(cmd) \
as (cin, _, _):
with handler as file_obj:
while True:
chunk = file_obj.read(1024)
if chunk:
cin.write(chunk)
else:
break
return True
except SshClientException:
return False
def _mkdir_r(self, path):
"""
Create directory on the remote server
:param path: remote directory
:type path: str
"""
cmd = 'mkdir -p "%s"' % path
self.execute_command(cmd)
def list_files(self, prefix, recursive=False):
"""
Get list of file by prefix
:param prefix: Path
:param recursive: Recursive return list of files
:type prefix: str
:type recursive: bool
:return: List of files
:rtype: list
"""
return sorted(self._ssh_client.list_files(prefix, recursive))
def find_files(self, prefix, run_type):
"""
Find files by prefix
:param prefix: Path
:param run_type: Run type for search
:type prefix: str
:type run_type: str
:return: List of files
:rtype: list
"""
cmd = "find {prefix}/ -wholename '*/{run_type}/*' -type f".format(
prefix=prefix, run_type=run_type)
cout, _ = self._ssh_client.execute(cmd)
return sorted(cout.split())
def delete(self, obj):
"""
Delete file by path
:param obj: path to a remote file.
"""
cmd = "rm %s" % obj
self.execute_command(cmd)
@contextmanager
def get_stream(self, path):
"""
Get a PIPE handler with content of the backup copy streamed from
the destination
:param path: Path to file
:type path: str
:return: Standard output.
"""
cmd = "cat %s" % path
def _read_write_chunk(channel, write_fd, size=1024):
while channel.recv_ready():
chunk = channel.recv(size)
LOG.debug('read %d bytes', len(chunk))
if chunk:
os.write(write_fd, chunk)
def _write_to_pipe(read_fd, write_fd):
try:
os.close(read_fd)
with self._ssh_client.session() as channel:
LOG.debug('Executing %s', cmd)
channel.exec_command(cmd)
while not channel.exit_status_ready():
_read_write_chunk(channel, write_fd)
LOG.debug('closing channel')
_read_write_chunk(channel, write_fd)
channel.recv_exit_status()
except KeyboardInterrupt:
return
read_process = None
try:
read_pipe, write_pipe = os.pipe()
read_process = Process(target=_write_to_pipe,
args=(read_pipe, write_pipe),
name='_write_to_pipe')
read_process.start()
os.close(write_pipe)
yield read_pipe
os.close(read_pipe)
read_process.join()
if read_process.exitcode:
raise SshDestinationError('Failed to download %s' % path)
LOG.debug('Successfully streamed %s', path)
finally:
if read_process:
read_process.join()
def _read_status(self):
if self._status_exists():
cmd = "cat %s" % self.status_path
with self._ssh_client.get_remote_handlers(cmd) as (_, stdout, _):
return MySQLStatus(content=stdout.read())
else:
return MySQLStatus()
def _write_status(self, status):
cmd = "cat - > %s" % self.status_path
with self._ssh_client.get_remote_handlers(cmd) as (cin, _, _):
cin.write(status.serialize())
def _status_exists(self):
"""
Check, if status exist
:return: Exist status
:rtype: bool
:raise SshDestinationError: if any error.
"""
cmd = "bash -c 'if test -s %s; " \
"then echo exists; " \
"else echo not_exists; " \
"fi'" % self.status_path
status, cerr = self._ssh_client.execute(cmd)
if status.strip() == 'exists':
return True
elif status.strip() == 'not_exists':
return False
else:
LOG.error(cerr)
msg = 'Unrecognized response: %s' % status
if status:
raise SshDestinationError(msg)
else:
raise SshDestinationError('Empty response from '
'SSH destination')
def execute_command(self, cmd, quiet=False, background=False):
"""Execute ssh command
:param cmd: Command for execution
:type cmd: str
:param quiet: If True don't print errors
:param background: Don't wait until the command exits.
:type background: bool
:return: Handlers of stdin, stdout and stderr
:rtype: tuple
"""
LOG.debug('Executing: %s', cmd)
return self._ssh_client.execute(cmd,
quiet=quiet,
background=background)
@property
def client(self):
"""Return client"""
return self._ssh_client
@property
def host(self):
"""IP address of the destination."""
return self._ssh_client.ssh_connect_info.host
def _mkdirname_r(self, remote_name):
"""Create directory for a given file on the destination.
For example, for a given file '/foo/bar/xyz' it would create
directory '/foo/bar/'.
:param remote_name: Full path to a file
:type remote_name: str
"""
return self._mkdir_r(os.path.dirname(remote_name))
def netcat(self, command, port=9990):
"""
Run netcat on the destination pipe it to a given command.
"""
try:
return self.execute_command("ncat -l %d --recv-only | "
"%s" % (port, command))
except SshDestinationError as err:
LOG.error(err)
def ensure_tcp_port_listening(self, port, wait_timeout=10):
"""
Check that tcp port is open and ready to accept connections.
Keep checking up to wait_timeout seconds.
:param port: TCP port that is supposed to be listening.
:type port: int
:param wait_timeout: wait this many seconds until the port is ready.
:type wait_timeout: int
:return: True if the TCP port is listening.
:rtype: bool
"""
stop_waiting_at = time.time() + wait_timeout
while time.time() < stop_waiting_at:
try:
cmd = "netstat -ln | grep -w 0.0.0.0:%d 2>&1 " \
"> /dev/null" % port
cout, cerr = self.execute_command(cmd)
LOG.debug('stdout: %s', cout)
LOG.debug('stderr: %s', cerr)
return True
except SshClientException as err:
LOG.debug(err)
time.sleep(1)
return False
def _get_file_content(self, path):
cmd = "cat %s" % path
with self._ssh_client.get_remote_handlers(cmd) as (_, stdout, _):
return stdout.read()
def _move_file(self, source, destination):
cmd = 'yes | cp -rf %s %s' % (source, destination)
self.execute_command(cmd)
class Ssh(BaseDestination):
"""
The SSH destination class represents a destination backup storage with
running SSH demon.
:param remote_path: Path to store backups.
:type remote_path: str
:param kwargs: Keyword arguments. See below.
:type kwargs: dict
* **hostname** (str): Hostname of the host where backup is taken from.
* **ssh_host** (str): Hostname for SSH connection. Default ``127.0.0.1``.
* **ssh_user** (str): Username for SSH connection. Default ``root``.
* **ssh_port** (int): TCP port for SSH connection. Default 22.
* **ssh_key** (str): File with an rsa/dsa key for SSH authentication.
Default ``/root/.ssh/id_rsa``.
"""
def __init__(self, remote_path, **kwargs):
super(Ssh, self).__init__(remote_path)
self._ssh_client = SshClient(host=kwargs.get('ssh_host', '127.0.0.1'),
port=kwargs.get('ssh_port', 22),
user=kwargs.get('ssh_user', 'root'),
key=kwargs.get('ssh_key',
'/root/.ssh/id_rsa'))
self._hostname = kwargs.get('hostname', socket.gethostname())
@property
def client(self):
"""
:return: SSH client.
:rtype: SshClient
"""
return self._ssh_client
@property
def host(self):
"""
:return: IP address of the destination.
:rtype: str
"""
return self._ssh_client.host
@property
def port(self):
"""
:return: TCP port of the destination.
:rtype: int
"""
return self._ssh_client.port
@property
def user(self):
"""
:return: SSH user.
:rtype: str
"""
return self._ssh_client.user
def delete(self, path):
"""
Delete file by path. The path is a relative to
the ``self.remote_path``.
:param path: Path to a remote file.
:type path: str
"""
cmd = "rm %s" % path
self.execute_command(cmd)
def ensure_tcp_port_listening(self, port, wait_timeout=10):
"""
Check that tcp port is open and ready to accept connections.
Keep checking up to ``wait_timeout`` seconds.
:param port: TCP port that is supposed to be listening.
:type port: int
:param wait_timeout: Wait this many seconds until the port is ready.
:type wait_timeout: int
:return: ``True`` if the TCP port is listening.
:rtype: bool
"""
stop_waiting_at = time.time() + wait_timeout
while time.time() < stop_waiting_at:
try:
cmd = "netstat -ln | grep -w 0.0.0.0:%d 2>&1 " \
"> /dev/null" % port
cout, cerr = self.execute_command(cmd)
LOG.debug('stdout: %s', cout)
LOG.debug('stderr: %s', cerr)
return True
except SshClientException as err:
LOG.debug(err)
time.sleep(1)
return False
def execute_command(self, cmd, quiet=False, background=False):
"""Execute ssh command on the remote destination.
:param cmd: Command to execute.
:type cmd: str
:param quiet: If ``True`` don't print errors.
:type quiet: bool
:param background: If ``True`` don't wait until the command exits.
:type background: bool
:return: stdin, stdout and stderr handlers.
:rtype: tuple
"""
LOG.debug('Executing: %s', cmd)
return self._ssh_client.execute(cmd,
quiet=quiet,
background=background)
@contextmanager
def get_stream(self, copy):
"""
Get a PIPE handler with content of the backup copy streamed from
the destination.
:param copy: Backup copy.
:type copy: BaseCopy
:return: Standard output.
:rtype: file
"""
path = "%s/%s" % (self.remote_path, copy.key)
cmd = "cat %s" % path
def _read_write_chunk(channel, write_fd, size=1024):
while channel.recv_ready():
chunk = channel.recv(size)
LOG.debug('read %d bytes', len(chunk))
if chunk:
os.write(write_fd, chunk)
def _write_to_pipe(read_fd, write_fd):
try:
os.close(read_fd)
with self._ssh_client.session() as channel:
LOG.debug('Executing %s', cmd)
channel.exec_command(cmd)
while not channel.exit_status_ready():
_read_write_chunk(channel, write_fd)
LOG.debug('closing channel')
_read_write_chunk(channel, write_fd)
channel.recv_exit_status()
except KeyboardInterrupt:
return
read_process = None
try:
read_pipe, write_pipe = os.pipe()
read_process = Process(target=_write_to_pipe,
args=(read_pipe, write_pipe),
name='_write_to_pipe')
read_process.start()
os.close(write_pipe)
yield read_pipe
os.close(read_pipe)
read_process.join()
if read_process.exitcode:
raise SshDestinationError('Failed to download %s' % path)
LOG.debug('Successfully streamed %s', path)
finally:
if read_process:
read_process.join()
def netcat(self, command, port=9990):
"""
Run ``netcat`` on the destination pipe it to a given command::
ncat -l <port> --recv-only | <command>
:param command: Command that would accept ``netcat``'s output.
:type command: str
:param port: TCP port to run ``netcat`` on. Default 9999.
:type port: int
"""
try:
return self.execute_command("ncat -l %d --recv-only | "
"%s" % (port, command))
except SshDestinationError as err:
LOG.error(err)
def read(self, filepath):
try:
return self._ssh_client.get_text_content(
osp.join(self.remote_path, filepath))
except IOError as err:
if err.errno == ENOENT:
raise FileNotFound('File %s does not exist' % filepath)
else:
raise
def save(self, handler, filepath):
"""
Read from the handler and save it on the remote ssh server in a file
``filepath``.
:param filepath: Relative path to a file to store the backup copy.
:type filepath: str
:param handler: Stream with content of the backup.
:type handler: file
"""
remote_name = osp.join(self.remote_path, filepath)
self._mkdir_r(osp.dirname(remote_name))
cmd = "cat - > %s" % remote_name
with self._ssh_client.get_remote_handlers(cmd) \
as (cin, _, _):
with handler as file_obj:
while True:
chunk = file_obj.read(1024)
if chunk:
cin.write(chunk)
else:
break
def write(self, content, filepath):
remote_name = osp.join(self.remote_path, filepath)
self._ssh_client.write_content(remote_name, content)
def _list_files(self, prefix=None, recursive=False, files_only=False):
return self._ssh_client.list_files(prefix,
recursive=recursive,
files_only=files_only)
def _mkdir_r(self, path):
"""
Create directory on the remote server.
:param path: Remote directory.
:type path: str
"""
cmd = 'mkdir -p "%s"' % path
self.execute_command(cmd)
def _move_file(self, source, destination):
cmd = 'yes | cp -rf %s %s' % (source, destination)
self.execute_command(cmd)
def __str__(self):
return "Ssh(ssh://%s@%s:%d%s)" % (
self.user,
self.host,
self.port,
self.remote_path,
)
class Ssh(BaseDestination):
"""
SSH destination class
:param remote_path: Path to store backup
:param kwargs: Keyword arguments. See below
:param kwargs: dict
:**hostname**(str): Hostname of the host where backup is taken from.
:**ssh_host**(str): Hostname for SSH connection. Default '127.0.0.1'.
:**ssh_user**(str): Username for SSH connection. Default 'root'.
:**ssh_port**(int): TCP port for SSH connection. Default 22.
:**ssh_key**(str): File with an rsa/dsa key for SSH authentication.
Default '/root/.ssh/id_rsa'.
"""
def __init__(self, remote_path, **kwargs):
super(Ssh, self).__init__(remote_path)
self._ssh_client = SshClient(host=kwargs.get('ssh_host', '127.0.0.1'),
port=kwargs.get('ssh_port', 22),
user=kwargs.get('ssh_user', 'root'),
key=kwargs.get('ssh_key',
'/root/.ssh/id_rsa'))
self._hostname = kwargs.get('hostname', socket.gethostname())
def __str__(self):
return "Ssh(ssh://%s@%s:%d%s)" % (
self.user,
self.host,
self.port,
self.remote_path,
)
def status_path(self, cls=MySQLStatus):
"""Path on the destination where status file will be stored."""
return "{remote_path}/{hostname}/{basename}".format(
remote_path=self.remote_path,
hostname=self._hostname,
basename=cls().basename)
def save(self, handler, name):
"""
Read from handler and save it on remote ssh server
:param name: relative path to a file to store the backup copy.
:param handler: stream with content of the backup.
"""
remote_name = osp.join(self.remote_path, name)
self._mkdir_r(osp.dirname(remote_name))
cmd = "cat - > %s" % remote_name
with self._ssh_client.get_remote_handlers(cmd) \
as (cin, _, _):
with handler as file_obj:
while True:
chunk = file_obj.read(1024)
if chunk:
cin.write(chunk)
else:
break
def _mkdir_r(self, path):
"""
Create directory on the remote server
:param path: remote directory
:type path: str
"""
cmd = 'mkdir -p "%s"' % path
self.execute_command(cmd)
def _list_files(self, path, recursive=False, files_only=False):
return self._ssh_client.list_files(path,
recursive=recursive,
files_only=files_only)
def delete(self, obj):
"""
Delete file by path
:param obj: path to a remote file.
"""
cmd = "rm %s" % obj
self.execute_command(cmd)
@contextmanager
def get_stream(self, copy):
"""
Get a PIPE handler with content of the backup copy streamed from
the destination
:param copy: Backup copy
:type copy: BaseCopy
:return: Standard output.
"""
path = "%s/%s" % (self.remote_path, copy.key)
cmd = "cat %s" % path
def _read_write_chunk(channel, write_fd, size=1024):
while channel.recv_ready():
chunk = channel.recv(size)
LOG.debug('read %d bytes', len(chunk))
if chunk:
os.write(write_fd, chunk)
def _write_to_pipe(read_fd, write_fd):
try:
os.close(read_fd)
with self._ssh_client.session() as channel:
LOG.debug('Executing %s', cmd)
channel.exec_command(cmd)
while not channel.exit_status_ready():
_read_write_chunk(channel, write_fd)
LOG.debug('closing channel')
_read_write_chunk(channel, write_fd)
channel.recv_exit_status()
except KeyboardInterrupt:
return
read_process = None
try:
read_pipe, write_pipe = os.pipe()
read_process = Process(target=_write_to_pipe,
args=(read_pipe, write_pipe),
name='_write_to_pipe')
read_process.start()
os.close(write_pipe)
yield read_pipe
os.close(read_pipe)
read_process.join()
if read_process.exitcode:
raise SshDestinationError('Failed to download %s' % path)
LOG.debug('Successfully streamed %s', path)
finally:
if read_process:
read_process.join()
def _read_status(self, cls=MySQLStatus):
if self._status_exists(cls=cls):
cmd = "cat %s" % self.status_path(cls=cls)
with self._ssh_client.get_remote_handlers(cmd) as (_, stdout, _):
return cls(content=stdout.read())
else:
return cls()
def _write_status(self, status, cls=MySQLStatus):
cmd = "cat - > %s" % self.status_path(cls=cls)
with self._ssh_client.get_remote_handlers(cmd) as (cin, _, _):
cin.write(status.serialize())
def _status_exists(self, cls=MySQLStatus):
"""
Check, if status exist
:return: Exist status
:rtype: bool
:raise SshDestinationError: if any error.
"""
cmd = "bash -c 'if test -s %s; " \
"then echo exists; " \
"else echo not_exists; " \
"fi'" % self.status_path(cls=cls)
status, cerr = self._ssh_client.execute(cmd)
if status.strip() == 'exists':
return True
elif status.strip() == 'not_exists':
return False
else:
LOG.error(cerr)
msg = 'Unrecognized response: %s' % status
if status:
raise SshDestinationError(msg)
else:
raise SshDestinationError(
'Empty response from SSH destination')
def execute_command(self, cmd, quiet=False, background=False):
"""Execute ssh command
:param cmd: Command for execution
:type cmd: str
:param quiet: If True don't print errors
:param background: Don't wait until the command exits.
:type background: bool
:return: Handlers of stdin, stdout and stderr
:rtype: tuple
"""
LOG.debug('Executing: %s', cmd)
return self._ssh_client.execute(cmd,
quiet=quiet,
background=background)
@property
def client(self):
"""Return client"""
return self._ssh_client
@property
def host(self):
"""IP address of the destination."""
return self._ssh_client.host
@property
def port(self):
"""TCP port of the destination."""
return self._ssh_client.port
@property
def user(self):
"""SSH user."""
return self._ssh_client.user
def netcat(self, command, port=9990):
"""
Run netcat on the destination pipe it to a given command.
"""
try:
return self.execute_command("ncat -l %d --recv-only | "
"%s" % (port, command))
except SshDestinationError as err:
LOG.error(err)
def ensure_tcp_port_listening(self, port, wait_timeout=10):
"""
Check that tcp port is open and ready to accept connections.
Keep checking up to wait_timeout seconds.
:param port: TCP port that is supposed to be listening.
:type port: int
:param wait_timeout: wait this many seconds until the port is ready.
:type wait_timeout: int
:return: True if the TCP port is listening.
:rtype: bool
"""
stop_waiting_at = time.time() + wait_timeout
while time.time() < stop_waiting_at:
try:
cmd = "netstat -ln | grep -w 0.0.0.0:%d 2>&1 " \
"> /dev/null" % port
cout, cerr = self.execute_command(cmd)
LOG.debug('stdout: %s', cout)
LOG.debug('stderr: %s', cerr)
return True
except SshClientException as err:
LOG.debug(err)
time.sleep(1)
return False
def _get_file_content(self, path):
cmd = "cat %s" % path
with self._ssh_client.get_remote_handlers(cmd) as (_, stdout, _):
return stdout.read()
def _move_file(self, source, destination):
cmd = 'yes | cp -rf %s %s' % (source, destination)
self.execute_command(cmd)
