tracing

func HTTPMiddleware ¶

func HTTPMiddleware(h http.Handler) http.Handler

func HeaderMatcher ¶

func HeaderMatcher(key string) (string, bool)

HeaderMatcher ensures that open tracing headers x-b3-* are forwarded to output requests

func New ¶

func New(service string, host string, zipkinEndpoint string) io.Closer

New initialises tracing uses zipkin client tracer

func NewFromEnv ¶

func NewFromEnv(service string, host string, endpointVar, disableVar string) io.Closer

NewFromEnv initialises tracing and returns a closer if tracing is configured. If the necessary configuration is not available it is Fatal unless disableVar is set and is truthy (strconf.ParseBool -> true). If tracing is disabled returns nil

func NewSpanContext ¶

func NewSpanContext(ctx context.Context, operationName string) (opentracing.Span, context.Context)

func NewTracer ¶

func NewTracer() io.Closer

func StartSpanFromContext ¶

func StartSpanFromContext(ctx context.Context, name string, options ...opentracing.StartSpanOption) (opentracing.Span, context.Context)

func TraceIDFromContext ¶

func TraceIDFromContext(ctx context.Context) string