mirror of
https://git.anonymousland.org/anonymousland/synapse.git
synced 2024-12-24 18:29:25 -05:00
98 lines
3.0 KiB
Python
98 lines
3.0 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2014 matrix.org
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
from synapse.api.errors import SynapseError
|
|
|
|
|
|
class PaginationConfig(object):
|
|
|
|
"""A configuration object which stores pagination parameters."""
|
|
|
|
def __init__(self, from_tok=None, to_tok=None, limit=0):
|
|
self.from_tok = from_tok
|
|
self.to_tok = to_tok
|
|
self.limit = limit
|
|
|
|
@classmethod
|
|
def from_request(cls, request, raise_invalid_params=True):
|
|
params = {
|
|
"from_tok": PaginationStream.TOK_START,
|
|
"to_tok": PaginationStream.TOK_END,
|
|
"limit": 0
|
|
}
|
|
|
|
query_param_mappings = [ # 3-tuple of qp_key, attribute, rules
|
|
("from", "from_tok", lambda x: type(x) == str),
|
|
("to", "to_tok", lambda x: type(x) == str),
|
|
("limit", "limit", lambda x: x.isdigit())
|
|
]
|
|
|
|
for qp, attr, is_valid in query_param_mappings:
|
|
if qp in request.args:
|
|
if is_valid(request.args[qp][0]):
|
|
params[attr] = request.args[qp][0]
|
|
elif raise_invalid_params:
|
|
raise SynapseError(400, "%s parameter is invalid." % qp)
|
|
|
|
return PaginationConfig(**params)
|
|
|
|
|
|
class PaginationStream(object):
|
|
|
|
""" An interface for streaming data as chunks. """
|
|
|
|
TOK_START = "START"
|
|
TOK_END = "END"
|
|
|
|
def get_chunk(self, config=None):
|
|
""" Return the next chunk in the stream.
|
|
|
|
Args:
|
|
config (PaginationConfig): The config to aid which chunk to get.
|
|
Returns:
|
|
A dict containing the new start token "start", the new end token
|
|
"end" and the data "chunk" as a list.
|
|
"""
|
|
raise NotImplementedError()
|
|
|
|
|
|
class StreamData(object):
|
|
|
|
""" An interface for obtaining streaming data from a table. """
|
|
|
|
def __init__(self, hs):
|
|
self.hs = hs
|
|
self.store = hs.get_datastore()
|
|
|
|
def get_rows(self, user_id, from_pkey, to_pkey, limit):
|
|
""" Get event stream data between the specified pkeys.
|
|
|
|
Args:
|
|
user_id : The user's ID
|
|
from_pkey : The starting pkey.
|
|
to_pkey : The end pkey. May be -1 to mean "latest".
|
|
limit: The max number of results to return.
|
|
Returns:
|
|
A tuple containing the list of event stream data and the last pkey.
|
|
"""
|
|
raise NotImplementedError()
|
|
|
|
def max_token(self):
|
|
""" Get the latest currently-valid token.
|
|
|
|
Returns:
|
|
The latest token."""
|
|
raise NotImplementedError()
|