mirror of https://github.com/borgbackup/borg.git
271 lines
9.2 KiB
Python
271 lines
9.2 KiB
Python
import fcntl
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import msgpack
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import os
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import select
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from subprocess import Popen, PIPE
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import sys
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import getpass
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from .repository import Repository
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from .lrucache import LRUCache
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BUFSIZE = 10 * 1024 * 1024
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class ConnectionClosed(Exception):
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"""Connection closed by remote host
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"""
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class RepositoryServer(object):
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def __init__(self):
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self.repository = 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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# Make stdout blocking
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fl = fcntl.fcntl(sys.stdout.fileno(), fcntl.F_GETFL)
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fcntl.fcntl(sys.stdout.fileno(), fcntl.F_SETFL, fl & ~os.O_NONBLOCK)
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unpacker = msgpack.Unpacker(use_list=False)
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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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method = method.decode('ascii')
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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.repository, method)
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res = f(*args)
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except Exception as e:
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sys.stdout.buffer.write(msgpack.packb((1, msgid, e.__class__.__name__, None)))
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else:
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sys.stdout.buffer.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 negotiate(self, versions):
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return 1
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def open(self, path, create=False):
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path = os.fsdecode(path)
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if path.startswith('/~'):
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path = path[1:]
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self.repository = Repository(os.path.expanduser(path), create)
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return self.repository.id
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class RemoteRepository(object):
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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.p = None
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self.cache = LRUCache(256)
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self.to_send = b''
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self.extra = {}
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self.pending = {}
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self.unpacker = msgpack.Unpacker(use_list=False)
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self.msgid = 0
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self.received_msgid = 0
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if location.host == '__testsuite__':
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args = [sys.executable, '-m', 'attic.archiver', 'serve']
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else:
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args = ['ssh', '-p', str(location.port), '%s@%s' % (location.user or getpass.getuser(), location.host), 'attic', 'serve']
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self.p = Popen(args, bufsize=0, stdin=PIPE, stdout=PIPE)
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self.stdin_fd = self.p.stdin.fileno()
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self.stdout_fd = self.p.stdout.fileno()
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fcntl.fcntl(self.stdin_fd, fcntl.F_SETFL, fcntl.fcntl(self.stdin_fd, fcntl.F_GETFL) | os.O_NONBLOCK)
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fcntl.fcntl(self.stdout_fd, fcntl.F_SETFL, fcntl.fcntl(self.stdout_fd, fcntl.F_GETFL) | os.O_NONBLOCK)
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self.r_fds = [self.stdout_fd]
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self.x_fds = [self.stdin_fd, self.stdout_fd]
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version = self.call('negotiate', (1,))
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if version != 1:
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raise Exception('Server insisted on using unsupported protocol version %d' % version)
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try:
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self.id = self.call('open', (location.path, create))
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except self.RPCError as e:
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if e.name == b'DoesNotExist':
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raise Repository.DoesNotExist
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elif e.name == b'AlreadyExists':
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raise Repository.AlreadyExists
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def __del__(self):
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self.close()
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def call(self, cmd, args, wait=True):
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self.msgid += 1
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to_send = msgpack.packb((1, self.msgid, cmd, args))
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w_fds = [self.stdin_fd]
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while wait or to_send:
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r, w, x = select.select(self.r_fds, w_fds, self.x_fds, 1)
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if x:
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raise Exception('FD exception occured')
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if r:
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data = os.read(self.stdout_fd, BUFSIZE)
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if not data:
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raise ConnectionClosed()
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self.unpacker.feed(data)
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for type, msgid, error, res in self.unpacker:
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if msgid == self.msgid:
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self.received_msgid = msgid
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if error:
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raise self.RPCError(error)
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else:
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return res
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else:
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args = self.pending.pop(msgid, None)
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if args is not None:
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self.cache[args] = msgid, res, error
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if w:
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if to_send:
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n = os.write(self.stdin_fd, to_send)
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assert n > 0
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to_send = memoryview(to_send)[n:]
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if not to_send:
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w_fds = []
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def _read(self):
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data = os.read(self.stdout_fd, BUFSIZE)
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if not data:
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raise Exception('Remote host closed connection')
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self.unpacker.feed(data)
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to_yield = []
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for type, msgid, error, res in self.unpacker:
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self.received_msgid = msgid
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args = self.pending.pop(msgid, None)
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if args is not None:
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self.cache[args] = msgid, res, error
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for args, resp, error in self.extra.pop(msgid, []):
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if not resp and not error:
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resp, error = self.cache[args][1:]
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to_yield.append((resp, error))
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for res, error in to_yield:
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if error:
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raise self.RPCError(error)
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else:
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yield res
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def gen_request(self, cmd, argsv, wait):
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data = []
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m = self.received_msgid
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for args in argsv:
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# Make sure to invalidate any existing cache entries for non-get requests
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if not args in self.cache:
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self.msgid += 1
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msgid = self.msgid
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self.pending[msgid] = args
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self.cache[args] = msgid, None, None
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data.append(msgpack.packb((1, msgid, cmd, args)))
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if wait:
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msgid, resp, error = self.cache[args]
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m = max(m, msgid)
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self.extra.setdefault(m, []).append((args, resp, error))
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return b''.join(data)
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def gen_cache_requests(self, cmd, peek):
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data = []
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while True:
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try:
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args = (peek()[0],)
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except StopIteration:
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break
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if args in self.cache:
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continue
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self.msgid += 1
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msgid = self.msgid
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self.pending[msgid] = args
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self.cache[args] = msgid, None, None
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data.append(msgpack.packb((1, msgid, cmd, args)))
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return b''.join(data)
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def call_multi(self, cmd, argsv, wait=True, peek=None):
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w_fds = [self.stdin_fd]
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left = len(argsv)
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data = self.gen_request(cmd, argsv, wait)
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self.to_send += data
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for args, resp, error in self.extra.pop(self.received_msgid, []):
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left -= 1
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if not resp and not error:
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resp, error = self.cache[args][1:]
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if error:
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raise self.RPCError(error)
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else:
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yield resp
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while left:
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r, w, x = select.select(self.r_fds, w_fds, self.x_fds, 1)
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if x:
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raise Exception('FD exception occured')
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if r:
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for res in self._read():
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left -= 1
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yield res
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if w:
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if not self.to_send and peek:
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self.to_send = self.gen_cache_requests(cmd, peek)
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if self.to_send:
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n = os.write(self.stdin_fd, self.to_send)
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assert n > 0
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# self.to_send = memoryview(self.to_send)[n:]
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self.to_send = self.to_send[n:]
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else:
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w_fds = []
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if not wait:
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return
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def commit(self, *args):
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self.call('commit', args)
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def rollback(self, *args):
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self.cache.clear()
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self.pending.clear()
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self.extra.clear()
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return self.call('rollback', args)
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def get(self, id):
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try:
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for res in self.call_multi('get', [(id, )]):
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return res
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except self.RPCError as e:
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if e.name == b'DoesNotExist':
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raise Repository.DoesNotExist
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raise
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def get_many(self, ids, peek=None):
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return self.call_multi('get', [(id, ) for id in ids], peek=peek)
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def _invalidate(self, id):
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key = (id, )
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if key in self.cache:
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self.pending.pop(self.cache.pop(key)[0], None)
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def put(self, id, data, wait=True):
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resp = self.call('put', (id, data), wait=wait)
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self._invalidate(id)
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return resp
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def delete(self, id, wait=True):
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resp = self.call('delete', (id, ), wait=wait)
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self._invalidate(id)
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return resp
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def close(self):
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if self.p:
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self.p.stdin.close()
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self.p.stdout.close()
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self.p.wait()
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self.p = None
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