Optimize the json render

[mstmdev]

1. Merge the write operation for json render and improve the code coverage.
2. Reduce convert between int32 and string in the AsciiJSON.Render function.

[codecov[bot]]

Codecov Report

Merging #3091 (9be676c) into master (92dd245) will increase coverage by 0.98%. The diff coverage is 100.00%.

:exclamation: Current head 9be676c differs from pull request most recent head 501fc1e. Consider uploading reports for the commit 501fc1e to get more accurate results

@@            Coverage Diff             @@
##           master    #3091      +/-   ##
==========================================
+ Coverage   98.06%   99.04%   +0.98%     
==========================================
  Files          43       43              
  Lines        3148     3565     +417     
==========================================
+ Hits         3087     3531     +444     
+ Misses         48       28      -20     
+ Partials       13        6       -7     

Flag	Coverage Δ
go-1.14	99.25% <100.00%> (?)
go-1.15	98.90% <100.00%> (+0.84%)	:arrow_up:
go-1.16	98.88% <100.00%> (+0.85%)	:arrow_up:
go-1.17	98.73% <100.00%> (+0.77%)	:arrow_up:
go-1.18	98.73% <100.00%> (+0.77%)	:arrow_up:
macos-latest	99.04% <100.00%> (+0.98%)	:arrow_up:
nomsgpack	99.03% <100.00%> (+0.99%)	:arrow_up:
ubuntu-latest	99.04% <100.00%> (+0.98%)	:arrow_up:

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Impacted Files	Coverage Δ
render/json.go	100.00% <100.00%> (+16.85%)	:arrow_up:
mode.go	100.00% <0.00%> (ø)
render/render.go	100.00% <0.00%> (ø)
binding/header.go	100.00% <0.00%> (ø)
binding/binding.go	100.00% <0.00%> (ø)
binding/binding_nomsgpack.go	100.00% <0.00%> (ø)
gin.go	99.79% <0.00%> (+0.60%)	:arrow_up:
context.go	98.39% <0.00%> (+1.63%)	:arrow_up:
debug.go	100.00% <0.00%> (+8.33%)	:arrow_up:

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[appleboy]

@mstmdev Please provide the benchmark result?

[mstmdev]

@mstmdev Please provide the benchmark result?

The benchmark test result:

Command:

go test -test.v -test.bench . ./render

Environment:

version: go1.18.3
goos: windows
goarch: amd64
pkg: github.com/gin-gonic/gin/render
cpu: Intel(R) Core(TM) i7-10700 CPU @ 2.90GHz

The AsciiJSON.Render benchmark result:

BenchmarkAsciiJSONRender(New Pull Request)
BenchmarkAsciiJSONRender-16       657159              1860 ns/op            1194 B/op         20 allocs/op

BenchmarkAsciiJSONRender(Old Master)
BenchmarkAsciiJSONRender-16       493408              2236 ns/op            1076 B/op         20 allocs/op

The JsonpJSON.Render benchmark result:

BenchmarkJsonpJSONRender(New Pull Request)
BenchmarkJsonpJSONRender-16      1312569               982.8 ns/op           884 B/op         10 allocs/op

BenchmarkJsonpJSONRender(Old Master)
BenchmarkJsonpJSONRender-16      1247179               985.2 ns/op           901 B/op         10 allocs/op