Structured stdout reporter

[mkorolyov]

Requirement - what kind of business use case are you trying to solve?

Hi, i want to report spans to stdout in structured format(e.g. JSON).

Problem - what in Jaeger blocks you from solving the requirement?

There is already Logger Reporter but it logs not structured span(span.String()) and span itself is very limited, not tags, no flags, operation name, etc.

Proposal - what do you suggest to solve the problem or improve the existing situation?

I want to contribute if it is acceptable. There are several ways we can achieve structured stdout:

1. Provide API to get private Span fields(e.g. Getters) or add new struct with public fields so anyone who needs will have possibility to implement Reporter the way he needs with access to full span data.
2. Implement new reporter that will do what needed(TBD)
3. ???

Any open questions to address

I'm prefer first approach for my self as it is more generalized one and provides more flexibility.
WDYT?

[yurishkuro]

I don't have objections to adding getters to Span.