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allocate.go
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allocate.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 protos
import (
"context"
"strings"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/reflect/protoregistry"
"namespacelabs.dev/foundation/internal/fnerrors"
)
func AllocateFrom(ctx context.Context, pctx ParseContext, value map[string]any) (proto.Message, error) {
typeUrl, ok := value["@type"].(string)
if !ok {
return nil, fnerrors.New("@type is missing")
}
if !strings.HasPrefix(typeUrl, TypeUrlPrefix) {
return nil, fnerrors.New("@type is missing %q prefix", TypeUrlPrefix)
}
fullName := strings.TrimPrefix(typeUrl, TypeUrlPrefix)
delete(value, "@type")
desc, err := protoregistry.GlobalFiles.FindDescriptorByName(protoreflect.FullName(fullName))
if err != nil {
return nil, fnerrors.New("%s: failed to load descriptor: %w", fullName, err)
}
if msgDesc, ok := desc.(protoreflect.MessageDescriptor); ok {
msg, err := AllocateWellKnownMessage(ctx, pctx, msgDesc, value)
if err != nil {
return nil, fnerrors.New("%s: failed to allocate message: %w", fullName, err)
}
return msg, nil
} else {
return nil, fnerrors.New("%s: can't use descriptor, not a message", fullName)
}
}