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resolver.go
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resolver.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package resolver
import (
"context"
"path"
"strings"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/reflect/protoregistry"
"google.golang.org/protobuf/types/dynamicpb"
wsprotos "namespacelabs.dev/foundation/internal/codegen/protos"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/schema"
"namespacelabs.dev/foundation/std/pkggraph"
)
type providerProtoResolver struct {
// proto resolver interface passes no context, so we retain the caller's.
ctx context.Context
root pkggraph.PackageLoader
}
func NewResolver(ctx context.Context, root pkggraph.PackageLoader) *providerProtoResolver {
return &providerProtoResolver{ctx, root}
}
func (pr *providerProtoResolver) resolvePackage(name schema.PackageName) (*pkggraph.Package, error) {
return pr.root.LoadByName(pr.ctx, name)
}
func (pr *providerProtoResolver) FindMessageByName(message protoreflect.FullName) (protoreflect.MessageType, error) {
return protoregistry.GlobalTypes.FindMessageByName(message)
}
func isBuiltinAny(url string) bool {
return strings.HasPrefix(url, "type.googleapis.com/")
}
func (pr *providerProtoResolver) FindMessageByURL(url string) (protoreflect.MessageType, error) {
if isBuiltinAny(url) {
return protoregistry.GlobalTypes.FindMessageByURL(url)
}
v := strings.TrimPrefix(url, wsprotos.FoundationTypeUrlBaseSlash)
if v == url {
return nil, protoregistry.NotFound
}
packageName := schema.PackageName(path.Dir(v))
typeName := path.Base(v)
pkg, err := pr.resolvePackage(packageName)
if err != nil {
return nil, err
}
for _, msg := range pkg.Provides {
_, providermsg, err := wsprotos.LoadMessageByName(msg, typeName)
if err != nil {
if err == protoregistry.NotFound {
continue
}
return nil, err
}
return dynamicpb.NewMessageType(providermsg), nil
}
return nil, fnerrors.New("referenced node %s does not provide type %s", packageName, typeName)
}
func (pr *providerProtoResolver) FindExtensionByName(field protoreflect.FullName) (protoreflect.ExtensionType, error) {
return protoregistry.GlobalTypes.FindExtensionByName(field)
}
func (pr *providerProtoResolver) FindExtensionByNumber(message protoreflect.FullName, field protoreflect.FieldNumber) (protoreflect.ExtensionType, error) {
return protoregistry.GlobalTypes.FindExtensionByNumber(message, field)
}