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70 lines
1.3 KiB
CoffeeScript
70 lines
1.3 KiB
CoffeeScript
class Cable.ConnectionMonitor
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identifier: Cable.PING_IDENTIFIER
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pollInterval:
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min: 2
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max: 30
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staleThreshold:
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startedAt: 4
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pingedAt: 8
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constructor: (@consumer) ->
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@consumer.subscriptions.add(this)
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@start()
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connected: ->
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@reset()
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@pingedAt = now()
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received: ->
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@pingedAt = now()
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reset: ->
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@reconnectAttempts = 0
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start: ->
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@reset()
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delete @stoppedAt
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@startedAt = now()
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@poll()
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stop: ->
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@stoppedAt = now()
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poll: ->
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setTimeout =>
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unless @stoppedAt
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@reconnectIfStale()
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@poll()
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, @getInterval()
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getInterval: ->
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{min, max} = @pollInterval
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interval = 4 * Math.log(@reconnectAttempts + 1)
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clamp(interval, min, max) * 1000
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reconnectIfStale: ->
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if @connectionIsStale()
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@reconnectAttempts += 1
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@consumer.connection.reopen()
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connectionIsStale: ->
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if @pingedAt
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secondsSince(@pingedAt) > @staleThreshold.pingedAt
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else
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secondsSince(@startedAt) > @staleThreshold.startedAt
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toJSON: ->
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interval = @getInterval()
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connectionIsStale = @connectionIsStale()
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{@startedAt, @stoppedAt, @pingedAt, @reconnectAttempts, connectionIsStale, interval}
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now = ->
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new Date().getTime()
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secondsSince = (time) ->
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(now() - time) / 1000
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clamp = (number, min, max) ->
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Math.max(min, Math.min(max, number))
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