Support server command

[matyhtf]

No description provided.

[codecov]

Codecov Report

Merging #4389 (7516610) into master (2a7e076) will increase coverage by 0.49%.
The diff coverage is 61.33%.

@@            Coverage Diff             @@
##           master    #4389      +/-   ##
==========================================
+ Coverage   50.90%   51.39%   +0.49%     
==========================================
  Files          72       73       +1     
  Lines       14549    14691     +142     
==========================================
+ Hits         7406     7551     +145     
+ Misses       7143     7140       -3     

Impacted Files	Coverage Δ
src/coroutine/system.cc	31.96% <0.00%> (ø)
src/reactor/epoll.cc	75.23% <ø> (ø)
src/wrapper/event.cc	90.38% <ø> (ø)
src/server/reactor_process.cc	40.00% <16.66%> (-2.36%)	⬇️
src/server/manager.cc	30.88% <33.33%> (ø)
src/server/task_worker.cc	21.97% <33.96%> (+0.50%)	⬆️
src/server/base.cc	60.71% <46.66%> (+6.45%)	⬆️
src/server/worker.cc	53.48% <54.16%> (+3.88%)	⬆️
src/server/master.cc	54.79% <59.03%> (+0.71%)	⬆️
src/server/reactor_thread.cc	57.76% <69.84%> (+1.96%)	⬆️
... and 20 more

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