forked from goadesign/goa
/
generator.go
115 lines (103 loc) · 3.21 KB
/
generator.go
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package genschema
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"text/template"
"github.com/raphael/goa/design"
"github.com/raphael/goa/goagen/codegen"
"gopkg.in/alecthomas/kingpin.v2"
)
// Generator is the application code generator.
type Generator struct {
genfiles []string
}
// Generate is the generator entry point called by the meta generator.
func Generate(api *design.APIDefinition) ([]string, error) {
g, err := NewGenerator()
if err != nil {
return nil, err
}
return g.Generate(api)
}
// NewGenerator returns the application code generator.
func NewGenerator() (*Generator, error) {
app := kingpin.New("Main generator", "application JSON schema generator")
codegen.RegisterFlags(app)
NewCommand().RegisterFlags(app)
_, err := app.Parse(os.Args[1:])
if err != nil {
return nil, fmt.Errorf(`invalid command line: %s. Command line was "%s"`,
err, strings.Join(os.Args, " "))
}
return new(Generator), nil
}
// JSONSchemaDir is the path to the directory where the schema controller is generated.
func JSONSchemaDir() string {
return filepath.Join(codegen.OutputDir, "schema")
}
// Generate produces the skeleton main.
func (g *Generator) Generate(api *design.APIDefinition) ([]string, error) {
os.RemoveAll(JSONSchemaDir())
os.MkdirAll(JSONSchemaDir(), 0755)
s := APISchema(api)
js, err := s.JSON()
if err != nil {
return nil, err
}
schemaFile := filepath.Join(JSONSchemaDir(), "schema.json")
if err := ioutil.WriteFile(schemaFile, js, 0755); err != nil {
return nil, err
}
g.genfiles = append(g.genfiles, schemaFile)
controllerFile := filepath.Join(JSONSchemaDir(), "schema.go")
tmpl, err := template.New("schema").Parse(jsonSchemaTmpl)
if err != nil {
panic(err.Error()) // bug
}
gg := codegen.NewGoGenerator(controllerFile)
imports := []*codegen.ImportSpec{
codegen.SimpleImport("github.com/raphael/goa"),
}
gg.WriteHeader(fmt.Sprintf("%s JSON Hyper-schema", api.Name), "schema", imports)
data := map[string]interface{}{
"schema": string(js),
}
err = tmpl.Execute(gg, data)
if err != nil {
g.Cleanup()
return nil, err
}
if err := gg.FormatCode(); err != nil {
g.Cleanup()
return nil, err
}
g.genfiles = []string{controllerFile, schemaFile}
return g.genfiles, nil
}
// Cleanup removes all the files generated by this generator during the last invokation of Generate.
func (g *Generator) Cleanup() {
for _, f := range g.genfiles {
os.Remove(f)
}
g.genfiles = nil
}
const jsonSchemaTmpl = `
// MountController mounts the API JSON schema controller under "/schema.json".
func MountController(service goa.Service) {
service.Info("mount", "ctrl", "Schema", "action", "Show", "route", "GET /schema.json")
h := goa.NewHTTPRouterHandle(service, "Schema", "Show", getSchema)
service.HTTPHandler().(*httprouter.Router).Handle("GET", "/schema.json", h)
}
// getSchema is the httprouter handle that returns the API JSON hyper schema.
// func getSchema(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
func getSchema(ctx *goa.Context) error {
ctx.Header().Set("Content-Type", "application/schema+json")
ctx.Header().Set("Cache-Control", "public, max-age=3600")
return ctx.Respond(200, []byte(schema))
}
// Generated schema
const schema = ` + "`" + `{{.schema}}` + "`" + `
`