synapse-product/synapse/federation/units.py

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2014-08-12 10:10:52 -04:00
# -*- coding: utf-8 -*-
# Copyright 2014 OpenMarket Ltd
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#
# 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.
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""" Defines the JSON structure of the protocol units used by the server to
server protocol.
"""
from synapse.util.jsonobject import JsonEncodedObject
import logging
import json
import copy
logger = logging.getLogger(__name__)
class Pdu(JsonEncodedObject):
""" A Pdu represents a piece of data sent from a server and is associated
with a context.
A Pdu can be classified as "state". For a given context, we can efficiently
retrieve all state pdu's that haven't been clobbered. Clobbering is done
via a unique constraint on the tuple (context, pdu_type, state_key). A pdu
is a state pdu if `is_state` is True.
Example pdu::
{
"pdu_id": "78c",
"ts": 1404835423000,
"origin": "bar",
"prev_ids": [
["23b", "foo"],
["56a", "bar"],
],
"content": { ... },
}
"""
valid_keys = [
"pdu_id",
"context",
"origin",
"ts",
"pdu_type",
"destinations",
"transaction_id",
"prev_pdus",
"depth",
"content",
"outlier",
"is_state", # Below this are keys valid only for State Pdus.
"state_key",
"power_level",
"prev_state_id",
"prev_state_origin",
"required_power_level",
"user_id",
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]
internal_keys = [
"destinations",
"transaction_id",
"outlier",
]
required_keys = [
"pdu_id",
"context",
"origin",
"ts",
"pdu_type",
"content",
]
# TODO: We need to make this properly load content rather than
# just leaving it as a dict. (OR DO WE?!)
def __init__(self, destinations=[], is_state=False, prev_pdus=[],
outlier=False, **kwargs):
if is_state:
for required_key in ["state_key"]:
if required_key not in kwargs:
raise RuntimeError("Key %s is required" % required_key)
super(Pdu, self).__init__(
destinations=destinations,
is_state=is_state,
prev_pdus=prev_pdus,
outlier=outlier,
**kwargs
)
@classmethod
def from_pdu_tuple(cls, pdu_tuple):
""" Converts a PduTuple to a Pdu
Args:
pdu_tuple (synapse.persistence.transactions.PduTuple): The tuple to
convert
Returns:
Pdu
"""
if pdu_tuple:
d = copy.copy(pdu_tuple.pdu_entry._asdict())
d["content"] = json.loads(d["content_json"])
del d["content_json"]
args = {f: d[f] for f in cls.valid_keys if f in d}
if "unrecognized_keys" in d and d["unrecognized_keys"]:
args.update(json.loads(d["unrecognized_keys"]))
return Pdu(
prev_pdus=pdu_tuple.prev_pdu_list,
**args
)
else:
return None
def __str__(self):
return "(%s, %s)" % (self.__class__.__name__, repr(self.__dict__))
def __repr__(self):
return "<%s, %s>" % (self.__class__.__name__, repr(self.__dict__))
class Edu(JsonEncodedObject):
""" An Edu represents a piece of data sent from one homeserver to another.
In comparison to Pdus, Edus are not persisted for a long time on disk, are
not meaningful beyond a given pair of homeservers, and don't have an
internal ID or previous references graph.
"""
valid_keys = [
"origin",
"destination",
"edu_type",
"content",
]
required_keys = [
"origin",
"destination",
"edu_type",
]
class Transaction(JsonEncodedObject):
""" A transaction is a list of Pdus and Edus to be sent to a remote home
server with some extra metadata.
Example transaction::
{
"origin": "foo",
"prev_ids": ["abc", "def"],
"pdus": [
...
],
}
"""
valid_keys = [
"transaction_id",
"origin",
"destination",
"ts",
"previous_ids",
"pdus",
"edus",
]
internal_keys = [
"transaction_id",
"destination",
]
required_keys = [
"transaction_id",
"origin",
"destination",
"ts",
"pdus",
]
def __init__(self, transaction_id=None, pdus=[], **kwargs):
""" If we include a list of pdus then we decode then as PDU's
automatically.
"""
# If there's no EDUs then remove the arg
if "edus" in kwargs and not kwargs["edus"]:
del kwargs["edus"]
super(Transaction, self).__init__(
transaction_id=transaction_id,
pdus=pdus,
**kwargs
)
@staticmethod
def create_new(pdus, **kwargs):
""" Used to create a new transaction. Will auto fill out
transaction_id and ts keys.
"""
if "ts" not in kwargs:
raise KeyError("Require 'ts' to construct a Transaction")
if "transaction_id" not in kwargs:
raise KeyError(
"Require 'transaction_id' to construct a Transaction"
)
for p in pdus:
p.transaction_id = kwargs["transaction_id"]
kwargs["pdus"] = [p.get_dict() for p in pdus]
return Transaction(**kwargs)