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51 lines
2.3 KiB
CoffeeScript
51 lines
2.3 KiB
CoffeeScript
logger = require 'logger-sharelatex'
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metrics = require "metrics-sharelatex"
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settings = require "settings-sharelatex"
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ClientMap = new Map() # for each redis client, stores a Map of subscribed channels (channelname -> subscribe promise)
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# Manage redis pubsub subscriptions for individual projects and docs, ensuring
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# that we never subscribe to a channel multiple times. The socket.io side is
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# handled by RoomManager.
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module.exports = ChannelManager =
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getClientMapEntry: (rclient) ->
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# return the rclient channel set if it exists, otherwise create and
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# return an empty set for the client.
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ClientMap.get(rclient) || ClientMap.set(rclient, new Map()).get(rclient)
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subscribe: (rclient, baseChannel, id) ->
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existingChannelSet = @getClientMapEntry(rclient)
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channel = "#{baseChannel}:#{id}"
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if existingChannelSet.has(channel)
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logger.error {channel}, "already subscribed - shouldn't happen"
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# return the subscribe promise, so we can wait for it to resolve
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return existingChannelSet.get(channel)
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else
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# get the subscribe promise and return it, the actual subscribe
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# completes in the background
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subscribePromise = rclient.subscribe channel
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existingChannelSet.set(channel, subscribePromise)
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logger.log {channel}, "subscribed to new channel"
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metrics.inc "subscribe.#{baseChannel}"
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return subscribePromise
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unsubscribe: (rclient, baseChannel, id) ->
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existingChannelSet = @getClientMapEntry(rclient)
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channel = "#{baseChannel}:#{id}"
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if !existingChannelSet.has(channel)
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logger.error {channel}, "not subscribed - shouldn't happen"
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else
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rclient.unsubscribe channel # completes in the background
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existingChannelSet.delete(channel)
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logger.log {channel}, "unsubscribed from channel"
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metrics.inc "unsubscribe.#{baseChannel}"
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publish: (rclient, baseChannel, id, data) ->
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if id is 'all' or !settings.publishOnIndividualChannels
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channel = baseChannel
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else
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channel = "#{baseChannel}:#{id}"
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# we publish on a different client to the subscribe, so we can't
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# check for the channel existing here
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rclient.publish channel, data
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