storage: reformat load function to reduce code

[lhy1024]

Signed-off-by: lhy1024 admin@liudos.us

What problem does this PR solve?

Issue Number: ref #4399

Check List

Tests

• Unit test
• Integration test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• JmPotato
• rleungx

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[lhy1024]

cc @AndreMouche

[codecov]

Codecov Report

Merging #4725 (e534d0c) into master (c78c652) will increase coverage by 0.04%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master    #4725      +/-   ##
==========================================
+ Coverage   75.02%   75.06%   +0.04%     
==========================================
  Files         284      284              
  Lines       27985    27975      -10     
==========================================
+ Hits        20995    21000       +5     
+ Misses       5120     5108      -12     
+ Partials     1870     1867       -3     

Flag	Coverage Δ
unittests	75.06% <83.33%> (+0.04%)	⬆️

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

Impacted Files	Coverage Δ
server/storage/endpoint/gc_safe_point.go	70.83% <50.00%> (+1.91%)	⬆️
server/storage/endpoint/config.go	76.47% <100.00%> (-2.48%)	⬇️
server/storage/endpoint/meta.go	62.35% <100.00%> (+1.43%)	⬆️
server/storage/endpoint/replication_status.go	63.63% <100.00%> (+9.79%)	⬆️
server/storage/endpoint/util.go	60.00% <100.00%> (-4.71%)	⬇️
pkg/metricutil/metricutil.go	82.75% <0.00%> (-10.35%)	⬇️
server/schedulers/shuffle_hot_region.go	55.55% <0.00%> (-10.11%)	⬇️
pkg/etcdutil/etcdutil.go	84.70% <0.00%> (-3.53%)	⬇️
server/tso/tso.go	64.00% <0.00%> (-1.72%)	⬇️
server/cluster/cluster.go	84.37% <0.00%> (-0.55%)	⬇️
... and 17 more

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[lhy1024]

/merge

[ti-chi-bot]

@lhy1024: 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: e534d0c