Support of evaluation context enrichment

[thomaspoignant]

Description

The common evaluation context is a new mechanism that enriches all the evaluation contexts with a common context of the execution server.

This is particularly useful when you support different environment variables, or if you want to target a specific server.

To use it, you can configure the field EvaluationContextEnrichment (map[string]interface{}), so you can add everything you want to enrich the request.

⚠️ In case we have the same key in the EvaluationContextEnrichment and in the EvaluationContext, the EvaluationContextEnrichment will override what was set in the EvaluationContext.

Example

If you configure your EvaluationContextEnrichment like this:

"serverName": "server01"
"IP": "8.8.8.8"
"environment": "prod"

And you evaluation your flag with this context:

"name": "John Doe"
"email": "john.doe@gofeatureflag.org"
"key": "123456789"

Your context will be merged and you will be able to create rules about all those fields:

"serverName": "server01"
"IP": "8.8.8.8"
"environment": "prod"
"name": "John Doe"
"email": "john.doe@gofeatureflag.org"
"key": "123456789"

Changes include

• New feature (non-breaking change that adds functionality)

Closes issue(s)

Resolve #1270

Checklist

• I have tested this code
• I have added unit test to cover this code
• I have updated the documentation (README.md and /website/docs)
• I have followed the contributing guide

[netlify]

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[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (8ffeb58) 88.67% compared to head (ccd52e7) 88.68%.

Files	Patch %	Lines
cmd/relayproxy/service/gofeatureflag.go	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1285      +/-   ##
==========================================
+ Coverage   88.67%   88.68%   +0.01%     
==========================================
  Files          70       71       +1     
  Lines        3275     3287      +12     
==========================================
+ Hits         2904     2915      +11     
- Misses        301      302       +1     
  Partials       70       70              

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[richardj-bsquare]

Looks like the new evaluation context should meet the requirements outlined in #1270

Looking forward to trying it out!

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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