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![Erik Johnston](/assets/img/avatar_default.png)
* Remove `conn_id` usage for UserSyncCommand. Each tcp replication connection is assigned a "conn_id", which is used to give an ID to a remotely connected worker. In a redis world, there will no longer be a one to one mapping between connection and instance, so instead we need to replace such usages with an ID generated by the remote instances and included in the replicaiton commands. This really only effects UserSyncCommand. * Add CLEAR_USER_SYNCS command that is sent on shutdown. This should help with the case where a synchrotron gets restarted gracefully, rather than rely on 5 minute timeout.
458 lines
11 KiB
Python
458 lines
11 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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from typing import Tuple, Type
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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 # type: ignore[no-redef] # noqa: F821
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_json_encoder = json.JSONEncoder(namedtuple_as_object=False) # type: ignore[call-arg] # noqa: F821
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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 # type: str
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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, None if token == "batch" else int(token), 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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(
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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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)
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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 server to tell the client the stream postition without
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needing to send an RDATA.
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On receipt of a POSITION command clients should check if they have missed
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any updates, and if so then fetch them out of band.
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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 streams.
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Format::
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REPLICATE
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"""
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NAME = "REPLICATE"
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def __init__(self):
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pass
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@classmethod
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def from_line(cls, line):
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return cls()
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def to_line(self):
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return ""
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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 <instance_id> <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, instance_id, user_id, is_syncing, last_sync_ms):
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self.instance_id = instance_id
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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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instance_id, user_id, state, last_sync_ms = line.split(" ", 3)
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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(instance_id, 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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(
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self.instance_id,
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self.user_id,
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"start" if self.is_syncing else "end",
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str(self.last_sync_ms),
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)
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)
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class ClearUserSyncsCommand(Command):
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"""Sent by the client to inform the server that it should drop all
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information about syncing users sent by the client.
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Mainly used when client is about to shut down.
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Format::
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CLEAR_USER_SYNC <instance_id>
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"""
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NAME = "CLEAR_USER_SYNC"
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def __init__(self, instance_id):
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self.instance_id = instance_id
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@classmethod
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def from_line(cls, line):
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return cls(line)
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def to_line(self):
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return self.instance_id
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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((self.cache_func, _json_encoder.encode(self.keys)))
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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(user_id, access_token, ip, user_agent, device_id, last_seen)
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def to_line(self):
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return (
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self.user_id
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+ " "
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+ _json_encoder.encode(
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(
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self.access_token,
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self.ip,
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self.user_agent,
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self.device_id,
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self.last_seen,
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)
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)
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)
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class RemoteServerUpCommand(Command):
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"""Sent when a worker has detected that a remote server is no longer
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"down" and retry timings should be reset.
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If sent from a client the server will relay to all other workers.
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Format::
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REMOTE_SERVER_UP <server>
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"""
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NAME = "REMOTE_SERVER_UP"
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_COMMANDS = (
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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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RemoteServerUpCommand,
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ClearUserSyncsCommand,
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) # type: Tuple[Type[Command], ...]
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# Map of command name to command type.
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COMMAND_MAP = {cmd.NAME: cmd for cmd in _COMMANDS}
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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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RemoteServerUpCommand.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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ClearUserSyncsCommand.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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RemoteServerUpCommand.NAME,
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)
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