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Events.md

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Events

Tailor extends EventEmitter, so you can subscribe to events with tailor.on('eventName', callback).

Events may be used for logging and monitoring. Check perf/benchmark.js for an example of getting metrics from Tailor.

Top level events

  • Client request received: start(request)
  • Response started (headers flushed and stream connected to output): response(request, status, headers)
  • Response ended (with the total size of response): end(request, contentSize)
  • Error: error(request, error) in case an error from template (parsing,fetching) and primary error(socket/timeout/50x) May be invoked with 2 signatures:
    • error(request, error)
    • error(request, error, response) - if you received event with this signature you must write response, TailorX will do nothing on it's side

Fragment events

  • Request start: fragment:start(request, fragment.attributes)
  • Response Start when headers received: fragment:response(request, fragment.attributes, status, headers)
  • Response End (with response size): fragment:end(request, fragment.attributes, contentSize)
  • Error: fragment:error(request, fragment.attributes, error) in case of socket error, timeout, 50x

Note: fragment:response, fragment:fallback and fragment:error are mutually exclusive. fragment:end happens only in case of successful response.