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![Richard van der Hoff](/assets/img/avatar_default.png)
Run the handlers for replication commands as background processes. This should improve the visibility in our metrics, and reduce the number of "running db transaction from sentinel context" warnings. Ideally it means converting the things that fire off deferreds into the night into things that actually return a Deferred when they are done. I've made a bit of a stab at this, but it will probably be leaky.
403 lines
10 KiB
Python
403 lines
10 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2017 Vector Creations 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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"""Defines the various valid commands
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The VALID_SERVER_COMMANDS and VALID_CLIENT_COMMANDS define which commands are
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allowed to be sent by which side.
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"""
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import logging
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import platform
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if platform.python_implementation() == "PyPy":
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import json
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_json_encoder = json.JSONEncoder()
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else:
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import simplejson as json
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_json_encoder = json.JSONEncoder(namedtuple_as_object=False)
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logger = logging.getLogger(__name__)
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class Command(object):
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"""The base command class.
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All subclasses must set the NAME variable which equates to the name of the
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command on the wire.
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A full command line on the wire is constructed from `NAME + " " + to_line()`
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The default implementation creates a command of form `<NAME> <data>`
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"""
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NAME = None
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def __init__(self, data):
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self.data = data
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@classmethod
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def from_line(cls, line):
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"""Deserialises a line from the wire into this command. `line` does not
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include the command.
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"""
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return cls(line)
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def to_line(self):
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"""Serialises the comamnd for the wire. Does not include the command
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prefix.
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"""
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return self.data
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def get_logcontext_id(self):
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"""Get a suitable string for the logcontext when processing this command"""
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# by default, we just use the command name.
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return self.NAME
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class ServerCommand(Command):
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"""Sent by the server on new connection and includes the server_name.
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Format::
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SERVER <server_name>
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"""
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NAME = "SERVER"
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class RdataCommand(Command):
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"""Sent by server when a subscribed stream has an update.
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Format::
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RDATA <stream_name> <token> <row_json>
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The `<token>` may either be a numeric stream id OR "batch". The latter case
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is used to support sending multiple updates with the same stream ID. This
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is done by sending an RDATA for each row, with all but the last RDATA having
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a token of "batch" and the last having the final stream ID.
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The client should batch all incoming RDATA with a token of "batch" (per
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stream_name) until it sees an RDATA with a numeric stream ID.
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`<token>` of "batch" maps to the instance variable `token` being None.
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An example of a batched series of RDATA::
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RDATA presence batch ["@foo:example.com", "online", ...]
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RDATA presence batch ["@bar:example.com", "online", ...]
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RDATA presence 59 ["@baz:example.com", "online", ...]
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"""
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NAME = "RDATA"
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def __init__(self, stream_name, token, row):
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self.stream_name = stream_name
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self.token = token
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self.row = row
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@classmethod
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def from_line(cls, line):
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stream_name, token, row_json = line.split(" ", 2)
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return cls(
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stream_name,
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None if token == "batch" else int(token),
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json.loads(row_json)
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)
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def to_line(self):
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return " ".join((
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self.stream_name,
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str(self.token) if self.token is not None else "batch",
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_json_encoder.encode(self.row),
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))
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def get_logcontext_id(self):
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return "RDATA-" + self.stream_name
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class PositionCommand(Command):
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"""Sent by the client to tell the client the stream postition without
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needing to send an RDATA.
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"""
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NAME = "POSITION"
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def __init__(self, stream_name, token):
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self.stream_name = stream_name
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self.token = token
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@classmethod
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def from_line(cls, line):
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stream_name, token = line.split(" ", 1)
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return cls(stream_name, int(token))
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def to_line(self):
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return " ".join((self.stream_name, str(self.token),))
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class ErrorCommand(Command):
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"""Sent by either side if there was an ERROR. The data is a string describing
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the error.
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"""
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NAME = "ERROR"
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class PingCommand(Command):
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"""Sent by either side as a keep alive. The data is arbitary (often timestamp)
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"""
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NAME = "PING"
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class NameCommand(Command):
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"""Sent by client to inform the server of the client's identity. The data
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is the name
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"""
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NAME = "NAME"
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class ReplicateCommand(Command):
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"""Sent by the client to subscribe to the stream.
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Format::
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REPLICATE <stream_name> <token>
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Where <token> may be either:
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* a numeric stream_id to stream updates from
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* "NOW" to stream all subsequent updates.
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The <stream_name> can be "ALL" to subscribe to all known streams, in which
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case the <token> must be set to "NOW", i.e.::
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REPLICATE ALL NOW
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"""
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NAME = "REPLICATE"
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def __init__(self, stream_name, token):
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self.stream_name = stream_name
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self.token = token
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@classmethod
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def from_line(cls, line):
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stream_name, token = line.split(" ", 1)
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if token in ("NOW", "now"):
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token = "NOW"
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else:
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token = int(token)
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return cls(stream_name, token)
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def to_line(self):
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return " ".join((self.stream_name, str(self.token),))
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def get_logcontext_id(self):
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return "REPLICATE-" + self.stream_name
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class UserSyncCommand(Command):
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"""Sent by the client to inform the server that a user has started or
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stopped syncing. Used to calculate presence on the master.
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Includes a timestamp of when the last user sync was.
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Format::
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USER_SYNC <user_id> <state> <last_sync_ms>
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Where <state> is either "start" or "stop"
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"""
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NAME = "USER_SYNC"
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def __init__(self, user_id, is_syncing, last_sync_ms):
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self.user_id = user_id
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self.is_syncing = is_syncing
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self.last_sync_ms = last_sync_ms
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@classmethod
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def from_line(cls, line):
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user_id, state, last_sync_ms = line.split(" ", 2)
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if state not in ("start", "end"):
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raise Exception("Invalid USER_SYNC state %r" % (state,))
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return cls(user_id, state == "start", int(last_sync_ms))
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def to_line(self):
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return " ".join((
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self.user_id, "start" if self.is_syncing else "end", str(self.last_sync_ms),
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))
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class FederationAckCommand(Command):
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"""Sent by the client when it has processed up to a given point in the
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federation stream. This allows the master to drop in-memory caches of the
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federation stream.
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This must only be sent from one worker (i.e. the one sending federation)
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Format::
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FEDERATION_ACK <token>
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"""
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NAME = "FEDERATION_ACK"
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def __init__(self, token):
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self.token = token
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@classmethod
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def from_line(cls, line):
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return cls(int(line))
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def to_line(self):
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return str(self.token)
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class SyncCommand(Command):
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"""Used for testing. The client protocol implementation allows waiting
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on a SYNC command with a specified data.
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"""
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NAME = "SYNC"
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class RemovePusherCommand(Command):
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"""Sent by the client to request the master remove the given pusher.
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Format::
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REMOVE_PUSHER <app_id> <push_key> <user_id>
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"""
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NAME = "REMOVE_PUSHER"
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def __init__(self, app_id, push_key, user_id):
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self.user_id = user_id
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self.app_id = app_id
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self.push_key = push_key
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@classmethod
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def from_line(cls, line):
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app_id, push_key, user_id = line.split(" ", 2)
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return cls(app_id, push_key, user_id)
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def to_line(self):
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return " ".join((self.app_id, self.push_key, self.user_id))
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class InvalidateCacheCommand(Command):
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"""Sent by the client to invalidate an upstream cache.
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THIS IS NOT RELIABLE, AND SHOULD *NOT* BE USED ACCEPT FOR THINGS THAT ARE
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NOT DISASTROUS IF WE DROP ON THE FLOOR.
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Mainly used to invalidate destination retry timing caches.
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Format::
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INVALIDATE_CACHE <cache_func> <keys_json>
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Where <keys_json> is a json list.
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"""
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NAME = "INVALIDATE_CACHE"
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def __init__(self, cache_func, keys):
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self.cache_func = cache_func
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self.keys = keys
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@classmethod
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def from_line(cls, line):
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cache_func, keys_json = line.split(" ", 1)
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return cls(cache_func, json.loads(keys_json))
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def to_line(self):
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return " ".join((
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self.cache_func, _json_encoder.encode(self.keys),
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))
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class UserIpCommand(Command):
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"""Sent periodically when a worker sees activity from a client.
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Format::
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USER_IP <user_id>, <access_token>, <ip>, <device_id>, <last_seen>, <user_agent>
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"""
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NAME = "USER_IP"
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def __init__(self, user_id, access_token, ip, user_agent, device_id, last_seen):
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self.user_id = user_id
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self.access_token = access_token
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self.ip = ip
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self.user_agent = user_agent
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self.device_id = device_id
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self.last_seen = last_seen
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@classmethod
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def from_line(cls, line):
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user_id, jsn = line.split(" ", 1)
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access_token, ip, user_agent, device_id, last_seen = json.loads(jsn)
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return cls(
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user_id, access_token, ip, user_agent, device_id, last_seen
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)
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def to_line(self):
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return self.user_id + " " + _json_encoder.encode((
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self.access_token, self.ip, self.user_agent, self.device_id,
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self.last_seen,
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))
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# Map of command name to command type.
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COMMAND_MAP = {
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cmd.NAME: cmd
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for cmd in (
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ServerCommand,
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RdataCommand,
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PositionCommand,
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ErrorCommand,
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PingCommand,
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NameCommand,
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ReplicateCommand,
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UserSyncCommand,
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FederationAckCommand,
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SyncCommand,
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RemovePusherCommand,
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InvalidateCacheCommand,
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UserIpCommand,
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)
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}
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# The commands the server is allowed to send
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VALID_SERVER_COMMANDS = (
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ServerCommand.NAME,
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RdataCommand.NAME,
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PositionCommand.NAME,
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ErrorCommand.NAME,
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PingCommand.NAME,
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SyncCommand.NAME,
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)
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# The commands the client is allowed to send
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VALID_CLIENT_COMMANDS = (
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NameCommand.NAME,
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ReplicateCommand.NAME,
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PingCommand.NAME,
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UserSyncCommand.NAME,
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FederationAckCommand.NAME,
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RemovePusherCommand.NAME,
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InvalidateCacheCommand.NAME,
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UserIpCommand.NAME,
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ErrorCommand.NAME,
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)
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