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middleware_generator.go
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/
middleware_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 generateMiddleware(c *config.Config, parsedTree *parser.Tree, r *rewriter.Rewriter) error {
if c.ResolverFilename == "resolver" {
fileName := path.Join(c.Resolver.Dir, "middleware.resolver.go")
f, err := os.Create(fileName)
if err != nil {
return err
}
defer f.Close()
pkgs := make(map[string]*types.Package)
if len(parsedTree.Middleware) > 0 {
pkgs["api"] = types.NewPackage("github.com/schartey/dgraph-lambda-go/api", "api")
}
err = middlewareResolverTemplate.Execute(f, struct {
Middleware map[string]string
Rewriter *rewriter.Rewriter
Packages map[string]*types.Package
PackageName string
}{
Middleware: parsedTree.Middleware,
Rewriter: r,
Packages: pkgs,
PackageName: c.Resolver.Package,
})
if err != nil {
return err
}
return nil
}
return errors.New("Resolver file pattern invalid")
}
var middlewareResolverTemplate = template.Must(template.New("middleware-resolver").Funcs(template.FuncMap{
"path": pkgPath,
"body": middlewareBody,
"is": is,
}).Parse(`
package {{.PackageName}}
import(
{{- range $pkg := .Packages }}
"{{ $pkg | path }}"{{- end}}
)
type MiddlewareResolverInterface interface {
{{- range $middleware := .Middleware}}
Middleware_{{$middleware}}(mc *api.MiddlewareContext) *api.LambdaError{{ end }}
}
type MiddlewareResolver struct {
*Resolver
}
{{ range $middleware := .Middleware}}
func (m *MiddlewareResolver) Middleware_{{$middleware}}(mc *api.MiddlewareContext) *api.LambdaError { {{ body (printf "Middleware_%s" $middleware) $.Rewriter }}}
{{ end }}
{{- range $key, $depBody := .Rewriter.DeprecatedBodies }}
{{ if is $key "Middleware_" }}
/* {{ $depBody }} */
{{ end }}
{{ end }}
`))