Expose interface to be able to use it on the server

[iamrodrigo]

What changed? Internal interface is exposed

Why? Currently server is not able to access to it

How did you test it?

Potential risks None since this is not working in prod yet

[iamrodrigo]

@longquanzheng ping to review this for the other PR please :)

[coveralls]

Pull Request Test Coverage Report for Build e9d180e5-2525-495e-888d-df7743e54a37

• 1 of 3 (33.33%) changed or added relevant lines in 2 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.006%) to 71.53%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
worker/worker.go	0	2	0.0%
<!--	Total:	1	3	33.33%	-->

Files with Coverage Reduction	New Missed Lines	%
worker/worker.go	1	16.67%
internal/common/convert.go	3	84.62%
<!--	Total:	4		-->

Totals
Change from base Build e896a605-97a0-44b7-a24f-a908a2c1b1b8:	-0.006%
Covered Lines:	12148
Relevant Lines:	16983

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💛 - Coveralls