mirror of https://github.com/borgbackup/borg.git
134 lines
4.1 KiB
Python
134 lines
4.1 KiB
Python
import fcntl
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import msgpack
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import os
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import paramiko
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import select
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import sys
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import getpass
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from .store import Store
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BUFSIZE = 1024 * 1024
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class StoreServer(object):
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def __init__(self):
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self.store = None
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def serve(self):
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# Make stdin non-blocking
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fl = fcntl.fcntl(sys.stdin.fileno(), fcntl.F_GETFL)
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fcntl.fcntl(sys.stdin.fileno(), fcntl.F_SETFL, fl | os.O_NONBLOCK)
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unpacker = msgpack.Unpacker()
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while True:
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r, w, es = select.select([sys.stdin], [], [], 10)
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if r:
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data = os.read(sys.stdin.fileno(), BUFSIZE)
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if not data:
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return
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unpacker.feed(data)
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for type, msgid, method, args in unpacker:
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try:
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try:
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f = getattr(self, method)
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except AttributeError:
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f = getattr(self.store, method)
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res = f(*args)
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except Exception, e:
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sys.stdout.write(msgpack.packb((1, msgid, e.__class__.__name__, None)))
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else:
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sys.stdout.write(msgpack.packb((1, msgid, None, res)))
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sys.stdout.flush()
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if es:
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return
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def open(self, path, create=False):
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if path.startswith('/~'):
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path = path[1:]
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self.store = Store(os.path.expanduser(path), create)
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return self.store.id, self.store.tid
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class RemoteStore(object):
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class DoesNotExist(Exception):
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pass
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class AlreadyExists(Exception):
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pass
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class RPCError(Exception):
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def __init__(self, name):
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self.name = name
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def __init__(self, location, create=False):
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self.client = paramiko.SSHClient()
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self.client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
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params = {'username': location.user or getpass.getuser(),
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'hostname': location.host, 'port': location.port}
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while True:
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try:
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self.client.connect(**params)
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break
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except paramiko.PasswordRequiredException:
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params['password'] = getpass.getpass('Password for %(username)s@%(hostname)s:' % params)
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self.unpacker = msgpack.Unpacker()
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self.transport = self.client.get_transport()
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self.channel = self.transport.open_session()
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self.channel.exec_command('darc serve')
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self.msgid = 0
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self.id, self.tid = self._cmd('open', (location.path, create))
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def _cmd(self, cmd, args):
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self.msgid += 1
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self.channel.sendall(msgpack.packb((0, self.msgid, cmd, args)))
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while True:
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r, w, e = select.select([self.channel], [], [self.channel], 10)
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if r:
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if self.channel.closed:
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raise Exception('Connection closed')
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if self.channel.recv_stderr_ready():
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print >> sys.stderr, 'remote stderr:', self.channel.recv_stderr(BUFSIZE)
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elif self.channel.recv_ready():
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self.unpacker.feed(self.channel.recv(BUFSIZE))
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for type, msgid, error, res in self.unpacker:
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if error:
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raise self.RPCError(error)
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return res
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if e:
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raise Exception('ssh channel error')
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def commit(self, *args):
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self._cmd('commit', args)
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self.tid += 1
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def rollback(self, *args):
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return self._cmd('rollback', args)
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def get(self, *args):
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try:
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return self._cmd('get', args)
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except self.RPCError, e:
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if e.name == 'DoesNotExist':
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raise self.DoesNotExist
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raise
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def put(self, *args):
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try:
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return self._cmd('put', args)
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except self.RPCError, e:
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if e.name == 'AlreadyExists':
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raise self.AlreadyExists
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def delete(self, *args):
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return self._cmd('delete', args)
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def list(self, *args):
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return self._cmd('list', args)
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