ExtractSpan retrieves an opentracing span context from the given context.Context The span context can be received directly (inside the context) or via an RPC call (encoded in binary format).

FinishSpan finishes a span retrieved from the given context and logs the error if it exists.

InjectSpan retrieves an opentrancing span from the current context and creates a new context with it encoded in binary format inside the propagatable context content.

LogError logs an error to an opentracing span.

StartSpan starts a new span with a given parent context, operation name, tags and optional parent span.