instrument

func ErrorCode ¶

func ErrorCode(err error) string

ErrorCode converts an error in to an http-style error-code.

func TimeRequestHistogram ¶

func TimeRequestHistogram(method string, metric *prometheus.HistogramVec, f func() error) error

TimeRequestHistogram runs 'f' and records how long it took in the given Prometheus histogram metric. If 'f' returns successfully, record a "200". Otherwise, record "500".

If you want more complicated logic for translating errors into statuses, use 'TimeRequestStatus'.

func TimeRequestHistogramStatus ¶

func TimeRequestHistogramStatus(method string, metric *prometheus.HistogramVec, toStatusCode func(error) string, f func() error) error

TimeRequestHistogramStatus runs 'f' and records how long it took in the given Prometheus histogram metric.

toStatusCode is a function that translates errors returned by 'f' into HTTP-like status codes.