func EndSpan(ctx context.Context, httpStatusCode int, err error)
EndSpan ends a previously started span stored in the context. Has no effect if a Tracer has not been registered.
func IsEnabled() bool
IsEnabled returns true if a Tracer has been registered.
func NewTransport(base *http.Transport) http.RoundTripper
NewTransport creates a new instrumenting http.RoundTripper for the registered Tracer. If no Tracer has been registered it returns nil.
func Register(t Tracer)
Register will register the provided Tracer. Pass nil to unregister a Tracer.
func StartSpan(ctx context.Context, name string) context.Context
StartSpan starts a trace span with the specified name, associating it with the provided context. Has no effect if a Tracer has not been registered.
Tracer represents an HTTP tracing facility.
type Tracer interface {
NewTransport(base *http.Transport) http.RoundTripper
StartSpan(ctx context.Context, name string) context.Context
EndSpan(ctx context.Context, httpStatusCode int, err error)
}