overleaf/libraries/metrics/event_loop.coffee
2018-05-10 10:10:34 +01:00

18 lines
657 B
CoffeeScript

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