Proposal for improve yurthub cache

[JameKeal]

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What this PR does / why we need it:

1. Sorting out the original architecture logic, identifying problems and proposing solutions
2. Optimized architectural design, weakened YurtHub cloud-side two patterns code design

Which issue(s) this PR fixes:

Fixes #

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/assign @rambohe-ch

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In response to this:

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:
/kind bug
/kind documentation
/kind enhancement
/kind good-first-issue
/kind feature
/kind question
/kind design
/sig ai
/sig iot
/sig network
/sig storage

/kind design

What this PR does / why we need it:

1. Sorting out the original architecture logic, identifying problems and proposing solutions
2. Optimized architectural design, weakened YurtHub cloud-side two patterns code design

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

/assign @rambohe-ch

Does this PR introduce a user-facing change?

other Note

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.68%. Comparing base (7fe6fd6) to head (2240828).
Report is 159 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1614      +/-   ##
==========================================
+ Coverage   51.42%   51.68%   +0.26%     
==========================================
  Files         134      218      +84     
  Lines       15947    26521   +10574     
==========================================
+ Hits         8200    13707    +5507     
- Misses       7001    11574    +4573     
- Partials      746     1240     +494     

Flag	Coverage Δ
unittests	51.68% <ø> (+0.26%)	⬆️

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[openyurt-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
0.4% Duplication

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[Congrool]

@JameKeal @rambohe-ch
Disscussion summary of weekly meeting at 2023.07.26.

1. Add metrics for cache, like failed times, data size, etc. @rambohe-ch
2. Original atomic ReplaceComponentList operation is replaced with multiple operations(like update, add, delete) in this proposal which is not atomic. Considering the case that yurthub is doing such "multiple operations" to cache the list response but failed by crash, the cached data on disk is incompleted and after restoring of yurthub it will use the incomplete data to serve client requests. The situation will not be relieved until the client sends a relist request and the yurthub sucessfully caches the new responses. @Congrool
3. The underlayer of the Store interface may be diskStorage or etcdStorage. If the interface is modified, the implementation of etcdStorage should also be aligned with it. @Congrool

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[sonarcloud]

Quality Gate passed

Issues
30 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.4% Duplication on New Code

See analysis details on SonarCloud