def deserialize_msg(msg):
# NOTE(russellb): Hang on to your hats, this road is about to
# get a little bumpy.
#
# Robustness Principle:
# "Be strict in what you send, liberal in what you accept."
#
# At this point we have to do a bit of guessing about what it
# is we just received. Here is the set of possibilities:
#
# 1) We received a dict. This could be 2 things:
#
# a) Inspect it to see if it looks like a standard message envelope.
# If so, great!
#
# b) If it doesn't look like a standard message envelope, it could either
# be a notification, or a message from before we added a message
# envelope (referred to as version 1.0).
# Just return the message as-is.
#
# 2) It's any other non-dict type. Just return it and hope for the best.
# This case covers return values from rpc.call() from before message
# envelopes were used. (messages to call a method were always a dict)
if not isinstance(msg, dict):
# See #2 above.
return msg
base_envelope_keys = (_VERSION_KEY, _MESSAGE_KEY)
if not all(map(lambda key: key in msg, base_envelope_keys)):
# See #1.b above.
return msg
# At this point we think we have the message envelope
# format we were expecting. (#1.a above)
if not utils.version_is_compatible(_RPC_ENVELOPE_VERSION,
msg[_VERSION_KEY]):
raise UnsupportedRpcEnvelopeVersion(version=msg[_VERSION_KEY])
raw_msg = jsonutils.loads(msg[_MESSAGE_KEY])
return raw_msg
def deserialize_msg(msg):
# NOTE(russellb): Hang on to your hats, this road is about to
# get a little bumpy.
#
# Robustness Principle:
# "Be strict in what you send, liberal in what you accept."
#
# At this point we have to do a bit of guessing about what it
# is we just received. Here is the set of possibilities:
#
# 1) We received a dict. This could be 2 things:
#
# a) Inspect it to see if it looks like a standard message envelope.
# If so, great!
#
# b) If it doesn't look like a standard message envelope, it could either
# be a notification, or a message from before we added a message
# envelope (referred to as version 1.0).
# Just return the message as-is.
#
# 2) It's any other non-dict type. Just return it and hope for the best.
# This case covers return values from rpc.call() from before message
# envelopes were used. (messages to call a method were always a dict)
if not isinstance(msg, dict):
# See #2 above.
return msg
base_envelope_keys = (_VERSION_KEY, _MESSAGE_KEY)
if not all(map(lambda key: key in msg, base_envelope_keys)):
# See #1.b above.
return msg
# At this point we think we have the message envelope
# format we were expecting. (#1.a above)
if not utils.version_is_compatible(_RPC_ENVELOPE_VERSION,
msg[_VERSION_KEY]):
raise UnsupportedRpcEnvelopeVersion(version=msg[_VERSION_KEY])
raw_msg = jsonutils.loads(msg[_MESSAGE_KEY])
return raw_msg
def _check_version_cap(self, version):
if not utils.version_is_compatible(self.version_cap, version):
raise RPCVersionCapError(version=version,
version_cap=self.version_cap)
def test_version_is_compatible_no_rev_is_zero(self):
self.assertTrue(utils.version_is_compatible('1.23.0', '1.23'))
def test_version_is_compatible_older_rev(self):
self.assertTrue(utils.version_is_compatible('1.24', '1.23.1'))
def test_version_is_compatible_newer_minor(self):
self.assertTrue(utils.version_is_compatible('1.24', '1.23'))
def _is_compatible(target, version):
endpoint_version = target.version or '1.0'
return utils.version_is_compatible(endpoint_version, version)
def _check_version_cap(self, version):
if not utils.version_is_compatible(self.version_cap, version):
raise RPCVersionCapError(version=version,
version_cap=self.version_cap)
def test_version_is_compatible_newer_minor(self):
self.assertTrue(utils.version_is_compatible('1.24', '1.23'))
def test_version_is_compatible_same(self):
self.assertTrue(utils.version_is_compatible('1.23', '1.23'))
def test_version_is_compatible_no_rev_is_zero(self):
self.assertTrue(utils.version_is_compatible('1.23.0', '1.23'))
def test_version_is_compatible_older_rev(self):
self.assertTrue(utils.version_is_compatible('1.24', '1.23.1'))
def test_version_is_compatible_newer_rev_both(self):
self.assertFalse(utils.version_is_compatible('1.23.1', '1.23.2'))
def test_version_is_compatible_major_difference2(self):
self.assertFalse(utils.version_is_compatible('1.23', '2.23'))
def test_version_is_compatible_older_minor(self):
self.assertFalse(utils.version_is_compatible('1.22', '1.23'))
def can_send_version(self, version=_marker):
"""Check to see if a version is compatible with the version cap."""
version = self.target.version if version is self._marker else version
return (not self.version_cap or
utils.version_is_compatible(self.version_cap,
self.target.version))
def test_version_is_compatible_older_minor(self):
self.assertFalse(utils.version_is_compatible('1.22', '1.23'))
def test_version_is_compatible_major_difference2(self):
self.assertFalse(utils.version_is_compatible('1.23', '2.23'))
def can_send_version(self, version=_marker):
"""Check to see if a version is compatible with the version cap."""
version = self.target.version if version is self._marker else version
return (not self.version_cap or utils.version_is_compatible(
self.version_cap, self.target.version))
def test_version_is_compatible_newer_rev_both(self):
self.assertFalse(utils.version_is_compatible('1.23.1', '1.23.2'))
def _is_compatible(target, version):
endpoint_version = target.version or '1.0'
return utils.version_is_compatible(endpoint_version, version)
def test_version_is_compatible_same(self):
self.assertTrue(utils.version_is_compatible('1.23', '1.23'))
