GetCtxFromGinContext extract span from ctx http 请求中调用grpc服务时使用.

Middleware is a gin native version of the equivalent middleware in: https://github.com/opentracing-contrib/go-stdlib/.

MWComponentName returns a MWOption that sets the component name for the app-side span.

MWSpanObserver returns a MWOption that observe the span for the app-side span.

MWURLTagFunc returns a MWOption that uses given function f to set the span's http.url tag.

NewOpenTraceClient 连接.

OperationNameFunc returns a MWOption that uses given function f to generate operation name for each app-side span.

SetSamplingFrequency 设置采样频率 0 <= n <= 100.

SpanTransferFromContextToHeader extract span from ctx.

TracerWrapper tracer 中间件.

Host h.

Port p.

MWOption controls the behavior of the Middleware.