Support custom json codec at runtime

[timandy]

Extract out an interface api.JsonApi to restrict all serialization and deserialization behaviors.

Developers only need to implement this interface and cover json.API value can realize custom json codec.

In the future, we can define api.XmlApi in the same way.

Solved #3217

[codecov[bot]]

Codecov Report

Merging #3222 (c654eb0) into master (a0acf1d) will increase coverage by 0.10%. The diff coverage is 100.00%.

:exclamation: Current head c654eb0 differs from pull request most recent head 8bbf3eb. Consider uploading reports for the commit 8bbf3eb to get more accurate results

@@            Coverage Diff             @@
##           master    #3222      +/-   ##
==========================================
+ Coverage   98.27%   98.37%   +0.10%     
==========================================
  Files          42       43       +1     
  Lines        3137     3148      +11     
==========================================
+ Hits         3083     3097      +14     
+ Misses         40       38       -2     
+ Partials       14       13       -1     

Flag	Coverage Δ
	?
go-1.15	98.37% <100.00%> (?)
go-1.16	98.35% <100.00%> (∅)
go-1.17	98.28% <100.00%> (+0.10%)	:arrow_up:
go-1.18	98.28% <100.00%> (+0.10%)	:arrow_up:
go-1.19	?
macos-latest	98.37% <100.00%> (+0.19%)	:arrow_up:
nomsgpack	98.35% <100.00%> (?)
ubuntu-latest	98.37% <100.00%> (+0.10%)	:arrow_up:

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

Impacted Files	Coverage Δ
binding/form_mapping.go	100.00% <100.00%> (ø)
binding/json.go	100.00% <100.00%> (ø)
errors.go	100.00% <100.00%> (ø)
render/json.go	83.14% <100.00%> (ø)
mode.go	100.00% <0.00%> (ø)
tree.go	100.00% <0.00%> (ø)
routergroup.go	100.00% <0.00%> (ø)
test_helpers.go	100.00% <0.00%> (ø)
binding/binding_nomsgpack.go	100.00% <0.00%> (ø)
... and 1 more

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[timandy]

@thinkerou PTAL, thks.

[timandy]

@thinkerou Could you make a code review for this PR. Thanks a lot.

[timandy]

@thinkerou @appleboy Please make a code review, thanks. We really need this feature in our project.

[thinkerou]

please also update readme, and add example code, thanks

[timandy]

please also update readme, and add example code, thanks

@thinkerou I extract out an interface api.JsonApi to restrict all serialization and deserialization behaviors.

Developers only need to implement this interface and cover json.API value can realize custom json codec.

In the future, we can define api.XmlApi in the same way.

And I also add examples in readme.

PTAL, thanks.

[timandy]

@thinkerou

[timandy]

@appleboy PLTA, thanks very much.

[thinkerou]

@timandy thanks a lot! the pull request have big modification and please review @appleboy @javierprovecho

[timandy]

@thinkerou In the previous force push, I fixed the format of the example in the readme file.

[timandy]

Any progress?

[timandy]

@appleboy @thinkerou @javierprovecho Please take a look