def get_paths(self, dst_ia, flags=(), flush=False):
"""Return a list of paths."""
logging.debug("Paths requested for ISDAS=%s, flags=%s, flush=%s",
dst_ia, flags, flush)
if flush:
logging.info("Flushing PathDBs.")
self._flush_path_dbs()
if self.addr.isd_as == dst_ia or (self.addr.isd_as.any_as() == dst_ia
and self.topology.is_core_as):
# Either the destination is the local AS, or the destination is any
# core AS in this ISD, and the local AS is in the core
empty = SCIONPath()
empty_meta = FwdPathMeta.from_values(empty, [], self.topology.mtu)
return [empty_meta], SCIONDPathReplyError.OK
paths = self.path_resolution(dst_ia, flags=flags)
if not paths:
key = dst_ia, flags
with self.req_path_lock:
if key not in self.requested_paths:
# No previous outstanding request
self.requested_paths[key] = threading.Event()
self._fetch_segments(key)
e = self.requested_paths[key]
if not e.wait(self.PATH_REQ_TOUT):
logging.error("Query timed out for %s", dst_ia)
return [], SCIONDPathReplyError.PS_TIMEOUT
paths = self.path_resolution(dst_ia, flags=flags)
error_code = (SCIONDPathReplyError.OK
if paths else SCIONDPathReplyError.NO_PATHS)
return paths, error_code
def _join_peer(up_segment, down_segment, point, peer_revs):
"""
Joins the supplied segments into a shortcut (peer) fullpath.
:param list up_segment: `up` :any:`PathSegment`.
:param list down_segment: `down` :any:`PathSegment`.
:param tuple point: Indexes of peer point.
:param RevCache peer_revs: Peering revocations.
:returns: :any:`CrossOverPath`.
"""
(up_index, down_index) = point
up_iof, up_hofs, up_upstream_hof, up_mtu = \
_copy_segment_shortcut(up_segment, up_index)
down_iof, down_hofs, down_upstream_hof, down_mtu = \
_copy_segment_shortcut(down_segment, down_index, up=False)
up_iof.shortcut = down_iof.shortcut = True
up_iof.peer = down_iof.peer = True
path_metas = []
for uph, dph, pm in _find_peer_hfs(up_segment.asm(up_index),
down_segment.asm(down_index),
peer_revs):
um = min(up_mtu, pm)
dm = min(down_mtu, pm)
args = _shortcut_path_args(up_iof, up_hofs + [uph, up_upstream_hof],
down_iof,
[down_upstream_hof, dph] + down_hofs)
path = SCIONPath.from_values(*args)
if_list = _build_shortcut_interface_list(up_segment, up_index,
down_segment, down_index,
(uph, dph))
mtu = _min_mtu(um, dm)
path_meta = FwdPathMeta.from_values(path, if_list, mtu)
path_metas.append(path_meta)
return path_metas
def _join_xovr(up_segment, down_segment, point):
"""
Joins the supplied segments into a shortcut (xovr) fullpath.
:param list up_segment: `up` :any:`PathSegment`.
:param list down_segment: `down` :any:`PathSegment`.
:param tuple point: Indexes of xovr point.
:returns: :any:`CrossOverPath`.
"""
(up_index, down_index) = point
up_iof, up_hofs, up_upstream_hof, up_mtu = \
_copy_segment_shortcut(up_segment, up_index)
down_iof, down_hofs, down_upstream_hof, down_mtu = \
_copy_segment_shortcut(down_segment, down_index, up=False)
up_iof.shortcut = down_iof.shortcut = True
up_iof.peer = down_iof.peer = False
up_hofs.append(up_upstream_hof)
down_hofs.insert(0, down_upstream_hof)
args = _shortcut_path_args(up_iof, up_hofs, down_iof, down_hofs)
path = SCIONPath.from_values(*args)
if_list = _build_shortcut_interface_list(up_segment, up_index,
down_segment, down_index)
mtu = _min_mtu(up_mtu, down_mtu)
path_meta = FwdPathMeta.from_values(path, if_list, mtu)
return [path_meta]
def get_paths(self, dst_ia, flags=(), flush=False):
"""Return a list of paths."""
logging.debug("Paths requested for ISDAS=%s, flags=%s, flush=%s",
dst_ia, flags, flush)
if flush:
logging.info("Flushing PathDBs.")
self._flush_path_dbs()
if self.addr.isd_as == dst_ia or (
self.addr.isd_as.any_as() == dst_ia and
self.topology.is_core_as):
# Either the destination is the local AS, or the destination is any
# core AS in this ISD, and the local AS is in the core
empty = SCIONPath()
empty_meta = FwdPathMeta.from_values(empty, [], self.topology.mtu)
return [empty_meta], SCIONDPathReplyError.OK
deadline = SCIONTime.get_time() + self.PATH_REQ_TOUT
e = threading.Event()
self.requests.put(((dst_ia, flags), e))
if not self._wait_for_events([e], deadline):
logging.error("Query timed out for %s", dst_ia)
return [], SCIONDPathReplyError.PS_TIMEOUT
paths = self.path_resolution(dst_ia, flags=flags)
error_code = (SCIONDPathReplyError.OK if paths
else SCIONDPathReplyError.NO_PATHS)
return paths, error_code
def test_xovr(self, build_list, path_args, copy_segment):
up_segment, down_segment, point, exp_time = self._setup(path_args, copy_segment)
path_meta = FwdPathMeta.from_values(SCIONPath(), [], 0, exp_time)
ntools.eq_(
path_combinator._join_xovr(up_segment, down_segment, point)[0],
path_meta)
copy_segment.assert_any_call(up_segment, 1)
copy_segment.assert_any_call(down_segment, 2, cons_dir=True)
ntools.eq_(build_list.call_count, 1)
def test_peer(self, find_peers, build_list, path_args, copy_segment):
up_segment, down_segment, point, exp_time = self._setup(path_args, copy_segment)
find_peers.return_value = [("uph1", "dph1", 1500),
("uph2", "dph2", 1500)]
peer_revs = create_mock()
path_meta = FwdPathMeta.from_values(SCIONPath(), [], 0, exp_time)
ntools.eq_(path_combinator._join_peer(
up_segment, down_segment, point, peer_revs)[0], path_meta)
copy_segment.assert_any_call(up_segment, 1)
copy_segment.assert_any_call(down_segment, 2, cons_dir=True)
ntools.eq_(build_list.call_count, 2)
def get_paths(self, dst_ia, flags=(), flush=False):
"""Return a list of paths."""
logging.debug("Paths requested for ISDAS=%s, flags=%s, flush=%s",
dst_ia, flags, flush)
if flush:
logging.info("Flushing PathDBs.")
self._flush_path_dbs()
if self.addr.isd_as == dst_ia or (self.addr.isd_as.any_as() == dst_ia
and self.topology.is_core_as):
# Either the destination is the local AS, or the destination is any
# core AS in this ISD, and the local AS is in the core
empty = SCIONPath()
exp_time = int(time.time()) + self.EMPTY_PATH_TTL
empty_meta = FwdPathMeta.from_values(empty, [], self.topology.mtu,
exp_time)
return [empty_meta], SCIONDPathReplyError.OK
paths = self.path_resolution(dst_ia, flags=flags)
if not paths:
key = dst_ia, flags
with self.req_path_lock:
r = self.requested_paths.get(key)
if r is None:
# No previous outstanding request
req = PathSegmentReq.from_values(self.addr.isd_as,
dst_ia,
flags=flags)
r = RequestState(req.copy())
self.requested_paths[key] = r
self._fetch_segments(req)
# Wait until event gets set.
timeout = not r.e.wait(PATH_REQ_TOUT)
with self.req_path_lock:
if timeout:
r.done()
if key in self.requested_paths:
del self.requested_paths[key]
if timeout:
logging.error("Query timed out for %s", dst_ia)
return [], SCIONDPathReplyError.PS_TIMEOUT
# Check if we can fulfill the path request.
paths = self.path_resolution(dst_ia, flags=flags)
if not paths:
logging.error("No paths found for %s", dst_ia)
return [], SCIONDPathReplyError.NO_PATHS
return paths, SCIONDPathReplyError.OK
def tuples_to_full_paths(tuples):
"""
For a set of tuples of possible end-to-end path [format is:
(up_seg, core_seg, down_seg)], return a list of fullpaths.
"""
res = []
for up_segment, core_segment, down_segment in tuples:
if not up_segment and not core_segment and not down_segment:
continue
if not _check_connected(up_segment, core_segment, down_segment):
continue
up_iof, up_hofs, up_mtu, up_exp = _copy_segment(
up_segment, False, (core_segment or down_segment))
core_iof, core_hofs, core_mtu, core_exp = _copy_segment(
core_segment, up_segment, down_segment)
down_iof, down_hofs, down_mtu, down_exp = _copy_segment(
down_segment, (up_segment or core_segment), False, cons_dir=True)
args = []
for iof, hofs in [(up_iof, up_hofs), (core_iof, core_hofs),
(down_iof, down_hofs)]:
if iof:
args.extend([iof, hofs])
path = SCIONPath.from_values(*args)
if up_segment:
up_core = list(reversed(list(up_segment.iter_asms())))
else:
up_core = []
if core_segment:
up_core += list(reversed(list(core_segment.iter_asms())))
if_list = _build_interface_list(up_core)
if down_segment:
down_core = list(down_segment.iter_asms())
else:
down_core = []
if_list += _build_interface_list(down_core, cons_dir=True)
mtu = _min_mtu(up_mtu, core_mtu, down_mtu)
exp = min(up_exp, core_exp, down_exp)
path_meta = FwdPathMeta.from_values(path, if_list, mtu, exp)
res.append(path_meta)
return res
