instrument

Documentation

Index

• func ErrorCode(err error) string
• func TimeRequestHistogram(ctx context.Context, method string, metric *prometheus.HistogramVec, ...) error
• func TimeRequestHistogramStatus(ctx context.Context, method string, metric *prometheus.HistogramVec, ...) error

Functions

func ErrorCode

func ErrorCode(err error) string

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

func TimeRequestHistogram

func TimeRequestHistogram(ctx context.Context, method string, metric *prometheus.HistogramVec, f func(context.Context) 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". It will also emit an OpenTracing span if you have a global tracer configured.

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

func TimeRequestHistogramStatus

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

TimeRequestHistogramStatus runs 'f' and records how long it took in the given Prometheus histogram metric. It will also emit an OpenTracing span if you have a global tracer configured.

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