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query_resolver_generator.go
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/
query_resolver_generator.go
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package generator
import (
"errors"
"fmt"
"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 generateQueryResolvers(c *config.Config, r *rewriter.Rewriter) error {
if c.ResolverFilename == "resolver" {
fileName := path.Join(c.Resolver.Dir, "query.resolver.go")
f, err := os.Create(fileName)
if err != nil {
return err
}
defer f.Close()
pkgs := make(map[string]*types.Package)
for _, m := range c.ParsedTree.ResolverTree.Queries {
if m.Return.TypeName.Exported() {
pkgs[m.Return.TypeName.Pkg().Name()] = m.Return.TypeName.Pkg()
}
for _, f := range m.Arguments {
if f.TypeName.Exported() {
pkgs[f.GoType.TypeName.Pkg().Name()] = f.GoType.TypeName.Pkg()
}
}
}
if len(c.ParsedTree.ResolverTree.Queries) > 0 {
pkgs["context"] = types.NewPackage("context", "context")
pkgs["api"] = types.NewPackage("github.com/schartey/dgraph-lambda-go/api", "api")
}
err = queryResolverTemplate.Execute(f, struct {
QueryResolvers map[string]*parser.Query
Rewriter *rewriter.Rewriter
Packages map[string]*types.Package
PackageName string
}{
QueryResolvers: c.ParsedTree.ResolverTree.Queries,
Rewriter: r,
Packages: pkgs,
PackageName: c.Resolver.Package,
})
if err != nil {
return err
}
return nil
}
return errors.New("Resolver file pattern invalid")
}
func returnRef(t *parser.GoType, isArray bool) string {
for _, te := range autobind {
if te == t.TypeName.Pkg().Path() {
if isArray {
return fmt.Sprintf("[]*%s.%s", t.TypeName.Pkg().Name(), t.TypeName.Name())
} else {
return fmt.Sprintf("*%s.%s", t.TypeName.Pkg().Name(), t.TypeName.Name())
}
}
}
if t.TypeName.Exported() {
if isArray {
return fmt.Sprintf("[]*%s.%s", t.TypeName.Pkg().Name(), t.TypeName.Name())
} else {
return fmt.Sprintf("*%s.%s", t.TypeName.Pkg().Name(), t.TypeName.Name())
}
}
if isArray {
return fmt.Sprintf("[]*%s", t.TypeName.Name())
} else {
return t.TypeName.Name()
}
}
var queryResolverTemplate = template.Must(template.New("query-resolver").Funcs(template.FuncMap{
"ref": returnRef,
"path": pkgPath,
"pointer": pointer,
"argsW": argsW,
"body": body,
"is": is,
}).Parse(`
package {{.PackageName}}
import(
{{- range $pkg := .Packages }}
"{{ $pkg | path }}"{{- end}}
)
/** Put these into resolvers.go or similar **/
type QueryResolver struct {
*Resolver
}
{{- range $queryResolver := .QueryResolvers}}
func (q *QueryResolver) Query_{{$queryResolver.Name}}(ctx context.Context{{ if ne (len $queryResolver.Arguments) 0}}, {{ $queryResolver.Arguments | argsW }}{{ end }}, authHeader api.AuthHeader) ({{ ref $queryResolver.Return.GoType $queryResolver.Return.IsArray }}, error) { {{ body (printf "Query_%s" $queryResolver.Name) $.Rewriter }}}
{{ end }}
{{- range $key, $depBody := .Rewriter.DeprecatedBodies }}
{{ if is $key "Query_" }}
/* {{ $depBody }} */
{{ end }}
{{ end }}
`))