client: refine some client code

[JmPotato]

Signed-off-by: JmPotato ghzpotato@gmail.com

What problem does this PR solve?

Refine some client code.

What is changed and how it works?

• Move go c.handleDispatcher(dispatcherCtx, dcLocation, dispatcher.tsoRequestCh) into the function createTSODispatcher to reduce an atomic loading operation.
• healthCancel() as soon as possible.

Check List

Tests

• Unit test
• Integration test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• rleungx

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[JmPotato]

@rleungx PTAL, thx!

[JmPotato]

/merge

[ti-chi-bot]

@JmPotato: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 1d6650a

[ti-chi-bot]

@JmPotato: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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[JmPotato]

/rebuild

[JmPotato]

/merge

[ti-chi-bot]

@JmPotato: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 85a1799

[JmPotato]

/run-unit-tests

[codecov]

Codecov Report

Merging #4205 (85a1799) into master (b4c1804) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4205      +/-   ##
==========================================
- Coverage   74.68%   74.67%   -0.01%     
==========================================
  Files         260      260              
  Lines       26705    26700       -5     
==========================================
- Hits        19944    19938       -6     
- Misses       4973     4978       +5     
+ Partials     1788     1784       -4     

Flag	Coverage Δ
unittests	74.67% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
client/client.go	72.45% <100.00%> (-0.19%)	⬇️
server/member/member.go	64.70% <0.00%> (-2.14%)	⬇️
server/election/leadership.go	75.25% <0.00%> (-2.07%)	⬇️
server/grpc_service.go	49.13% <0.00%> (-1.43%)	⬇️
server/tso/allocator_manager.go	61.00% <0.00%> (-1.34%)	⬇️
server/server.go	71.40% <0.00%> (-1.20%)	⬇️
server/tso/global_allocator.go	60.84% <0.00%> (-1.06%)	⬇️
server/core/storage.go	68.79% <0.00%> (-0.76%)	⬇️
server/schedule/operator_controller.go	83.50% <0.00%> (-0.41%)	⬇️
... and 10 more

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