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37 lines
1.1 KiB
CoffeeScript
37 lines
1.1 KiB
CoffeeScript
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module.exports = (obj, methodName, prefix, logger) ->
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metrics = require('./metrics')
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if typeof obj[methodName] != 'function'
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throw new Error("[Metrics] expected object property '#{methodName}' to be a function")
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realMethod = obj[methodName]
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key = "#{prefix}.#{methodName}"
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obj[methodName] = (originalArgs...) ->
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[firstArgs..., callback] = originalArgs
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if !callback? || typeof callback != 'function'
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if logger?
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logger.log "[Metrics] expected wrapped method '#{methodName}' to be invoked with a callback"
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return realMethod.apply this, originalArgs
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timer = new metrics.Timer(key)
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realMethod.call this, firstArgs..., (callbackArgs...) ->
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elapsedTime = timer.done()
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possibleError = callbackArgs[0]
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if possibleError?
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metrics.inc "#{key}.failure"
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else
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metrics.inc "#{key}.success"
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if logger?
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loggableArgs = {}
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try
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for arg, idx in firstArgs
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if arg.toString().match(/^[0-9a-f]{24}$/)
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loggableArgs["#{idx}"] = arg
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logger.log {key, args: loggableArgs, elapsedTime}, "[Metrics] timed async method call"
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callback.apply this, callbackArgs
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