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18 lines
657 B
CoffeeScript
18 lines
657 B
CoffeeScript
module.exports = EventLoopMonitor =
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monitor: (logger, interval = 1000, log_threshold = 100) ->
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Metrics = require "./metrics"
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# check for logger on startup to avoid exceptions later if undefined
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throw new Error("logger is undefined") if !logger?
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# monitor delay in setInterval to detect event loop blocking
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previous = Date.now()
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intervalId = setInterval () ->
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now = Date.now()
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offset = now - previous - interval
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if offset > log_threshold
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logger.warn {offset: offset}, "slow event loop"
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previous = now
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Metrics.timing("event-loop-millsec", offset)
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, interval
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Metrics.registerDestructor () ->
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clearInterval(intervalId)
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