GetContext get custom context.

GetRequest get request datatype from context.

GetSpan get opentracing span from context.

New create go-garden instance.

SetContext set custom context.

StartSpanFormRpc start and get opentracing span from rpc call.

StartSpanFromHeader Get the opentracing span from the request header If no span, will create new root span, if any, new child span.

StartSpanFromTextMap Get the opentracing span from textMap If no span, will create new root span, if any, new child span.