refactor: encapsulate functions to reuse code

[nayihz]

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches

What this PR does / why we need it:

ref: #969

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[codecov-commenter]

Codecov Report

Merging #971 (326c95b) into master (f081121) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #971   +/-   ##
=======================================
  Coverage   31.91%   31.91%           
=======================================
  Files          73       73           
  Lines        7953     7953           
=======================================
  Hits         2538     2538           
  Misses       5139     5139           
  Partials      276      276           

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[tao12345666333]

LGTM

Thanks