Created
June 15, 2021 13:23
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CUE -> OpenAPI generation
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| package main | |
| import ( | |
| "bytes" | |
| "encoding/json" | |
| "fmt" | |
| "log" | |
| "cuelang.org/go/cue" | |
| "cuelang.org/go/cue/load" | |
| "cuelang.org/go/encoding/openapi" | |
| ) | |
| func generateOpenAPI(defFile string, config *load.Config) ([]byte, error) { | |
| buildInstances := load.Instances([]string{defFile}, config) | |
| insts := cue.Build(buildInstances) | |
| b, err := openapi.Gen(insts[0], nil) | |
| if err != nil { | |
| return nil, err | |
| } | |
| var out bytes.Buffer | |
| err = json.Indent(&out, b, "", " ") | |
| if err != nil { | |
| return nil, err | |
| } | |
| return out.Bytes(), nil | |
| } | |
| func ExampleGenerateOpenAPI() { | |
| src := bytes.NewBufferString(`#Identity: { | |
| // first name of the person | |
| first: =~ "[A-Z].*" | |
| // Last name of the person | |
| Last: =~ "[A-Z].*" | |
| // Age of the person | |
| Age?: number & < 130 | |
| } | |
| `) | |
| b, err := generateOpenAPI("-", &load.Config{ | |
| Stdin: src, | |
| }) | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| // This contains the OpenAPI.json definition | |
| fmt.Println(string(b)) | |
| // output: | |
| // { | |
| // "openapi": "3.0.0", | |
| // "info": { | |
| // "title": "Generated by cue.", | |
| // "version": "no version" | |
| // }, | |
| // "paths": {}, | |
| // "components": { | |
| // "schemas": { | |
| // "Identity": { | |
| // "type": "object", | |
| // "required": [ | |
| // "first", | |
| // "Last" | |
| // ], | |
| // "properties": { | |
| // "first": { | |
| // "description": "first name of the person", | |
| // "type": "string", | |
| // "pattern": "[A-Z].*" | |
| // }, | |
| // "Last": { | |
| // "description": "Last name of the person", | |
| // "type": "string", | |
| // "pattern": "[A-Z].*" | |
| // }, | |
| // "Age": { | |
| // "description": "Age of the person", | |
| // "type": "number", | |
| // "maximum": 130, | |
| // "exclusiveMaximum": true | |
| // } | |
| // } | |
| // } | |
| // } | |
| // } | |
| // } | |
| } |
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Was struggling to figure out how to convert cue to openapi, thanks for this great example :D !