api: Add Request Info Middleware

[CabinfeverB]

Signed-off-by: Cabinfever_B cabinfeveroier@gmail.com

What problem does this PR solve?

close #4538
This PR is used to support the information-gathering.

This PR should be merged after #4491 and #4495

What is changed and how it works?

This PR creates a middleware to handle the information-gathering for audit middleware and rate limit middleware.
RequestInfo includes below fields

ServiceLabel: service label is used to identify HTTP API and gRPC. According to this identification, A logical service, whether it is gRPC or HTTP, can be controlled by a total limiter. On HTTP API, it is the result of a mapping from the URL path and method. So we can use the names of the mux router to register ServiceLabel. But we must add middlewares into mux route.
Method indicates whether it is gRPC or HTTP
Component: component info of source client
IP: IP of the source client
TimeStamp
URLParam : params from URL Path
BodyParm: params from POST body

For the HTTP API interfaces which need to be audited and limited, we should register their service labels on /server/api/router.go

Benchmark test

for serviceInfoMiddleware in integration test

test BenchmarkDoRequestWithServiceMiddleware thrice and result: 287778 ns/op, 291501 ns/op and 265002 ns/op.
test BenchmarkDoRequestWithoutServiceMiddlewarethrice and result: 232358 ns/op, 277101 ns/op and 213643 ns/op

Based on the above test, serviceMiddleware won't have a big performance impact on the HTTP API.

Check List

Tests

• Unit test
• Integration test

Code changes

• Has HTTP API interfaces change (Don't forget to add the declarative for API)
• Has configuration change

Side effects

• Possible performance regression

Release note

Add request info middleware

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• disksing
• nolouch

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[CabinfeverB]

/run-all-tests

[CabinfeverB]

/run-all-tests

[CabinfeverB]

/retest

[CabinfeverB]

/run-all-tests

[codecov]

Codecov Report

Merging #4526 (924f302) into master (c7632b8) will increase coverage by 0.17%.
The diff coverage is 95.87%.

@@            Coverage Diff             @@
##           master    #4526      +/-   ##
==========================================
+ Coverage   74.71%   74.88%   +0.17%     
==========================================
  Files         279      281       +2     
  Lines       27627    27706      +79     
==========================================
+ Hits        20641    20749     +108     
+ Misses       5129     5113      -16     
+ Partials     1857     1844      -13     

Flag	Coverage Δ
unittests	74.88% <95.87%> (+0.17%)	⬆️

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

Impacted Files	Coverage Δ
server/config/config.go	77.84% <ø> (ø)
server/api/admin.go	51.56% <57.14%> (+0.68%)	⬆️
pkg/apiutil/apiutil.go	71.21% <75.00%> (+3.47%)	⬆️
pkg/requestutil/request_info.go	78.94% <78.94%> (ø)
server/api/router.go	97.32% <99.40%> (-0.11%)	⬇️
pkg/requestutil/context.go	100.00% <100.00%> (ø)
server/api/middleware.go	88.00% <100.00%> (+15.27%)	⬆️
server/server.go	74.75% <100.00%> (+0.57%)	⬆️
server/tso/allocator_manager.go	63.45% <0.00%> (-1.07%)	⬇️
server/election/leadership.go	77.31% <0.00%> (-1.04%)	⬇️
... and 18 more

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[CabinfeverB]

/cc @rleungx

[CabinfeverB]

/run-all-tests

[CabinfeverB]

/run-all-tests

[CabinfeverB]

/rebuild

[disksing]

/merge

[ti-chi-bot]

@disksing: 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: 924f302

[rleungx]

The comment needs to be changed.