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field_resolver_generator.go
102 lines (87 loc) · 3.01 KB
/
field_resolver_generator.go
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package generator
import (
"errors"
"go/types"
"os"
"path"
"text/template"
"github.com/schartey/dgraph-lambda-go/codegen/config"
"github.com/schartey/dgraph-lambda-go/codegen/parser"
"github.com/schartey/dgraph-lambda-go/codegen/rewriter"
)
func generateFieldResolvers(c *config.Config, parsedTree *parser.Tree, r *rewriter.Rewriter) error {
if c.ResolverFilename == "resolver" {
fileName := path.Join(c.Resolver.Dir, "field.resolver.go")
f, err := os.Create(fileName)
if err != nil {
return err
}
defer f.Close()
var pkgs = make(map[string]*types.Package)
for _, m := range parsedTree.ResolverTree.FieldResolvers {
if m.Field.TypeName.Exported() {
pkgs[m.Field.TypeName.Pkg().Name()] = m.Field.TypeName.Pkg()
}
if m.Parent.TypeName.Exported() {
pkgs[m.Parent.TypeName.Pkg().Name()] = m.Parent.TypeName.Pkg()
}
}
if len(parsedTree.ResolverTree.FieldResolvers) > 0 {
pkgs["context"] = types.NewPackage("context", "context")
pkgs["api"] = types.NewPackage("github.com/schartey/dgraph-lambda-go/api", "api")
}
err = fieldResolverTemplate.Execute(f, struct {
FieldResolvers map[string]*parser.FieldResolver
Rewriter *rewriter.Rewriter
Packages map[string]*types.Package
PackageName string
}{
FieldResolvers: parsedTree.ResolverTree.FieldResolvers,
Rewriter: r,
Packages: pkgs,
PackageName: c.Resolver.Package,
})
if err != nil {
return err
}
return nil
}
return errors.New("Resolver file pattern invalid")
}
func fieldResolverBody(key string, rewriter *rewriter.Rewriter) string {
if val, ok := rewriter.RewriteBodies[key]; ok {
return val
} else {
return `
return nil, nil
`
}
}
var fieldResolverTemplate = template.Must(template.New("field-resolver").Funcs(template.FuncMap{
"ref": modelRef,
"path": pkgPath,
"pointer": pointer,
"body": fieldResolverBody,
"is": is,
}).Parse(`
package {{.PackageName}}
import(
{{- range $pkg := .Packages }}
"{{ $pkg | path }}"{{- end}}
)
type FieldResolverInterface interface {
{{- range $fieldResolver := .FieldResolvers}}
{{$fieldResolver.Parent.Name }}_{{$fieldResolver.Field.Name}}(ctx context.Context, parents []{{ pointer $fieldResolver.Parent.GoType false }}, authHeader api.AuthHeader) ([]{{ pointer $fieldResolver.Field.GoType $fieldResolver.Field.IsArray }}, *api.LambdaError){{ end }}
}
type FieldResolver struct {
*Resolver
}
{{- range $fieldResolver := .FieldResolvers}}
func (f *FieldResolver) {{$fieldResolver.Parent.Name }}_{{$fieldResolver.Field.Name}}(ctx context.Context, parents []{{ pointer $fieldResolver.Parent.GoType false }}, authHeader api.AuthHeader) ([]{{ pointer $fieldResolver.Field.GoType $fieldResolver.Field.IsArray }}, *api.LambdaError) { {{ body (printf "%s_%s" $fieldResolver.Parent.Name $fieldResolver.Field.Name) $.Rewriter }}}
{{ end }}
{{- range $key, $depBody := .Rewriter.DeprecatedBodies }}
{{ if and (not (is $key "Query_")) (not (is $key "Mutation_")) (not (is $key "Middleware_")) }}
/* {{ $depBody }} */
{{ end }}
{{ end }}
`))