fix: revise connection api

[Yisaer]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 73.80952% with 11 lines in your changes missing coverage. Please review.

Project coverage is 71.16%. Comparing base (29e56e7) to head (85adcd3).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/connection/connection_pool.go	66.67%	4 Missing and 2 partials ⚠️
internal/server/connection.go	79.17%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3159      +/-   ##
==========================================
+ Coverage   70.97%   71.16%   +0.19%     
==========================================
  Files         397      397              
  Lines       43085    43044      -41     
==========================================
+ Hits        30577    30630      +53     
+ Misses      10111    10001     -110     
- Partials     2397     2413      +16     

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