const ScopeName … type config … type Option … type optionFunc … func (o optionFunc) apply(c *config) { … } // newConfig creates a new config struct and applies opts to it. func newConfig(opts ...Option) *config { … } // WithTracerProvider specifies a tracer provider to use for creating a tracer. // If none is specified, the global provider is used. func WithTracerProvider(provider trace.TracerProvider) Option { … } // WithMeterProvider specifies a meter provider to use for creating a meter. // If none is specified, the global provider is used. func WithMeterProvider(provider metric.MeterProvider) Option { … } // WithPublicEndpoint configures the Handler to link the span with an incoming // span context. If this option is not provided, then the association is a child // association instead of a link. func WithPublicEndpoint() Option { … } // WithPublicEndpointFn runs with every request, and allows conditionally // configuring the Handler to link the span with an incoming span context. If // this option is not provided or returns false, then the association is a // child association instead of a link. // Note: WithPublicEndpoint takes precedence over WithPublicEndpointFn. func WithPublicEndpointFn(fn func(*http.Request) bool) Option { … } // WithPropagators configures specific propagators. If this // option isn't specified, then the global TextMapPropagator is used. func WithPropagators(ps propagation.TextMapPropagator) Option { … } // WithSpanOptions configures an additional set of // trace.SpanOptions, which are applied to each new span. func WithSpanOptions(opts ...trace.SpanStartOption) Option { … } // WithFilter adds a filter to the list of filters used by the handler. // If any filter indicates to exclude a request then the request will not be // traced. All filters must allow a request to be traced for a Span to be created. // If no filters are provided then all requests are traced. // Filters will be invoked for each processed request, it is advised to make them // simple and fast. func WithFilter(f Filter) Option { … } type event … const ReadEvents … const WriteEvents … // WithMessageEvents configures the Handler to record the specified events // (span.AddEvent) on spans. By default only summary attributes are added at the // end of the request. // // Valid events are: // - ReadEvents: Record the number of bytes read after every http.Request.Body.Read // using the ReadBytesKey // - WriteEvents: Record the number of bytes written after every http.ResponeWriter.Write // using the WriteBytesKey func WithMessageEvents(events ...event) Option { … } // WithSpanNameFormatter takes a function that will be called on every // request and the returned string will become the Span Name. func WithSpanNameFormatter(f func(operation string, r *http.Request) string) Option { … } // WithClientTrace takes a function that returns client trace instance that will be // applied to the requests sent through the otelhttp Transport. func WithClientTrace(f func(context.Context) *httptrace.ClientTrace) Option { … } // WithServerName returns an Option that sets the name of the (virtual) server // handling requests. func WithServerName(server string) Option { … }
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