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WIP: Completely change how event streaming and pagination work. This reflects the change in the underlying storage model.

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This commit is contained in:
Erik Johnston 2014-08-26 18:57:46 +01:00
parent 8885c8546c
commit 3a2a5b959c
16 changed files with 432 additions and 650 deletions
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66
synapse/types.py
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@ -97,72 +97,32 @@ class RoomID(DomainSpecificString):
class StreamToken(
namedtuple(
"Token",
("events_type", "topological_key", "stream_key", "presence_key")
("events_key", "presence_key")
)
):
_SEPARATOR = "_"
_TOPOLOGICAL_PREFIX = "t"
_STREAM_PREFIX = "s"
_TOPOLOGICAL_SEPERATOR = "-"
TOPOLOGICAL_TYPE = "topo"
STREAM_TYPE = "stream"
@classmethod
def from_string(cls, string):
try:
events_part, presence_part = string.split(cls._SEPARATOR)
presence_key = int(presence_part)
topo_length = len(cls._TOPOLOGICAL_PREFIX)
stream_length = len(cls._STREAM_PREFIX)
if events_part[:topo_length] == cls._TOPOLOGICAL_PREFIX:
# topological event token
topo_tok = events_part[topo_length:]
topo_key, stream_key = topo_tok.split(
cls._TOPOLOGICAL_SEPERATOR, 1
)
topo_key = int(topo_key)
stream_key = int(stream_key)
events_type = cls.TOPOLOGICAL_TYPE
elif events_part[:stream_length] == cls._STREAM_PREFIX:
topo_key = None
stream_key = int(events_part[stream_length:])
events_type = cls.STREAM_TYPE
else:
raise
events_key, presence_key = string.split(cls._SEPARATOR)
return cls(
events_type=events_type,
topological_key=topo_key,
stream_key=stream_key,
events_key=events_key,
presence_key=presence_key,
)
except:
raise SynapseError(400, "Invalid Token")
def to_string(self):
if self.events_type == self.TOPOLOGICAL_TYPE:
return "".join([
self._TOPOLOGICAL_PREFIX,
str(self.topological_key),
self._TOPOLOGICAL_SEPERATOR,
str(self.stream_key),
self._SEPARATOR,
str(self.presence_key),
])
elif self.events_type == self.STREAM_TYPE:
return "".join([
self._STREAM_PREFIX,
str(self.stream_key),
self._SEPARATOR,
str(self.presence_key),
])
return "".join([
str(self.events_key),
self._SEPARATOR,
str(self.presence_key),
])
raise RuntimeError("Unrecognized event type: %s", self.events_type)
def copy_and_replace(self, key, new_value):
d = self._asdict()
d[key] = new_value
return StreamToken(**d)