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106 lines
3.5 KiB
106 lines
3.5 KiB
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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from synapse.api.errors import SynapseError
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from synapse.http.servlet import parse_integer, parse_string
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from synapse.types import StreamToken
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logger = logging.getLogger(__name__)
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MAX_LIMIT = 1000
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class SourcePaginationConfig(object):
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"""A configuration object which stores pagination parameters for a
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specific event source."""
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def __init__(self, from_key=None, to_key=None, direction="f", limit=None):
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self.from_key = from_key
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self.to_key = to_key
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self.direction = "f" if direction == "f" else "b"
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self.limit = min(int(limit), MAX_LIMIT) if limit is not None else None
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def __repr__(self):
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return "StreamConfig(from_key=%r, to_key=%r, direction=%r, limit=%r)" % (
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self.from_key,
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self.to_key,
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self.direction,
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self.limit,
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)
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class PaginationConfig(object):
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"""A configuration object which stores pagination parameters."""
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def __init__(self, from_token=None, to_token=None, direction="f", limit=None):
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self.from_token = from_token
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self.to_token = to_token
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self.direction = "f" if direction == "f" else "b"
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self.limit = min(int(limit), MAX_LIMIT) if limit is not None else None
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@classmethod
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def from_request(cls, request, raise_invalid_params=True, default_limit=None):
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direction = parse_string(request, "dir", default="f", allowed_values=["f", "b"])
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from_tok = parse_string(request, "from")
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to_tok = parse_string(request, "to")
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try:
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if from_tok == "END":
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from_tok = None # For backwards compat.
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elif from_tok:
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from_tok = StreamToken.from_string(from_tok)
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except Exception:
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raise SynapseError(400, "'from' paramater is invalid")
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try:
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if to_tok:
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to_tok = StreamToken.from_string(to_tok)
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except Exception:
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raise SynapseError(400, "'to' paramater is invalid")
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limit = parse_integer(request, "limit", default=default_limit)
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if limit and limit < 0:
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raise SynapseError(400, "Limit must be 0 or above")
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try:
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return PaginationConfig(from_tok, to_tok, direction, limit)
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except Exception:
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logger.exception("Failed to create pagination config")
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raise SynapseError(400, "Invalid request.")
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def __repr__(self):
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return ("PaginationConfig(from_tok=%r, to_tok=%r, direction=%r, limit=%r)") % (
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self.from_token,
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self.to_token,
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self.direction,
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self.limit,
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)
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def get_source_config(self, source_name):
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keyname = "%s_key" % source_name
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return SourcePaginationConfig(
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from_key=getattr(self.from_token, keyname),
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to_key=getattr(self.to_token, keyname) if self.to_token else None,
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direction=self.direction,
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limit=self.limit,
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)
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