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86 lines
4 KiB
CoffeeScript
86 lines
4 KiB
CoffeeScript
logger = require "logger-sharelatex"
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settings = require 'settings-sharelatex'
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RedisClientManager = require "./RedisClientManager"
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SafeJsonParse = require "./SafeJsonParse"
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EventLogger = require "./EventLogger"
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HealthCheckManager = require "./HealthCheckManager"
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RoomManager = require "./RoomManager"
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ChannelManager = require "./ChannelManager"
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metrics = require "metrics-sharelatex"
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MESSAGE_SIZE_LOG_LIMIT = 1024 * 1024 # 1Mb
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module.exports = DocumentUpdaterController =
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# DocumentUpdaterController is responsible for updates that come via Redis
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# Pub/Sub from the document updater.
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rclientList: RedisClientManager.createClientList(settings.redis.pubsub)
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listenForUpdatesFromDocumentUpdater: (io) ->
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logger.log {rclients: @rclientList.length}, "listening for applied-ops events"
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for rclient, i in @rclientList
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rclient.subscribe "applied-ops"
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rclient.on "message", (channel, message) ->
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metrics.inc "rclient", 0.001 # global event rate metric
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EventLogger.debugEvent(channel, message) if settings.debugEvents > 0
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DocumentUpdaterController._processMessageFromDocumentUpdater(io, channel, message)
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# create metrics for each redis instance only when we have multiple redis clients
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if @rclientList.length > 1
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for rclient, i in @rclientList
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do (i) ->
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rclient.on "message", () ->
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metrics.inc "rclient-#{i}", 0.001 # per client event rate metric
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for rclient in @rclientList
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@handleRoomUpdates(rclient)
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handleRoomUpdates: (rclientSub) ->
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roomEvents = RoomManager.eventSource()
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roomEvents.on 'doc-active', (doc_id) ->
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ChannelManager.subscribe rclientSub, "applied-ops", doc_id
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roomEvents.on 'doc-empty', (doc_id) ->
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ChannelManager.unsubscribe rclientSub, "applied-ops", doc_id
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_processMessageFromDocumentUpdater: (io, channel, message) ->
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SafeJsonParse.parse message, (error, message) ->
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if error?
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logger.error {err: error, channel}, "error parsing JSON"
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return
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if message.op?
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if message._id? && settings.checkEventOrder
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status = EventLogger.checkEventOrder("applied-ops", message._id, message)
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if status is 'duplicate'
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return # skip duplicate events
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DocumentUpdaterController._applyUpdateFromDocumentUpdater(io, message.doc_id, message.op)
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else if message.error?
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DocumentUpdaterController._processErrorFromDocumentUpdater(io, message.doc_id, message.error, message)
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else if message.health_check?
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logger.debug {message}, "got health check message in applied ops channel"
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HealthCheckManager.check channel, message.key
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_applyUpdateFromDocumentUpdater: (io, doc_id, update) ->
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clientList = io.sockets.clients(doc_id)
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# avoid unnecessary work if no clients are connected
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if clientList.length is 0
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return
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# send updates to clients
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logger.log doc_id: doc_id, version: update.v, source: update.meta?.source, socketIoClients: (client.id for client in clientList), "distributing updates to clients"
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seen = {}
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# send messages only to unique clients (due to duplicate entries in io.sockets.clients)
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for client in clientList when not seen[client.id]
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seen[client.id] = true
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if client.id == update.meta.source
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logger.log doc_id: doc_id, version: update.v, source: update.meta?.source, "distributing update to sender"
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client.emit "otUpdateApplied", v: update.v, doc: update.doc
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else if !update.dup # Duplicate ops should just be sent back to sending client for acknowledgement
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logger.log doc_id: doc_id, version: update.v, source: update.meta?.source, client_id: client.id, "distributing update to collaborator"
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client.emit "otUpdateApplied", update
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if Object.keys(seen).length < clientList.length
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metrics.inc "socket-io.duplicate-clients", 0.1
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logger.log doc_id: doc_id, socketIoClients: (client.id for client in clientList), "discarded duplicate clients"
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_processErrorFromDocumentUpdater: (io, doc_id, error, message) ->
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for client in io.sockets.clients(doc_id)
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logger.warn err: error, doc_id: doc_id, client_id: client.id, "error from document updater, disconnecting client"
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client.emit "otUpdateError", error, message
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client.disconnect()
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