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uuid.go
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uuid.go
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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package timestamps
import (
"cloud.google.com/go/datastore"
"github.com/google/uuid"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
func UUIDToDatastoreProperty(name string, u uuid.UUID, noIndex bool) datastore.Property {
// Output an empty string instead of "000000-..." to save space
if u == uuid.Nil {
return datastore.Property{
Name: name,
Value: "",
NoIndex: noIndex,
}
}
return datastore.Property{
Name: name,
Value: u.String(),
NoIndex: noIndex,
}
}
func LoadUUID(ps []datastore.Property, name string) (uuid.UUID, []datastore.Property, error) {
for i, p := range ps {
if p.Name == name {
if s, ok := p.Value.(string); ok {
// The property needs to be removed from ps before passed to LoadStruct.
// This overwrites the slice but it seems fine with the current library.
ps[i] = ps[len(ps)-1]
ps = ps[:len(ps)-1]
if s == "" {
// Treat empty strings as the nil UUID
return uuid.Nil, ps, nil
}
sig, err := uuid.Parse(s)
if err != nil {
return uuid.Nil, ps, err
}
return sig, ps, nil
}
return uuid.Nil, ps, status.Errorf(codes.Internal, "UUID property is not string: %+v", p.Value)
}
}
return uuid.Nil, ps, status.Errorf(codes.Internal, "UUID property is not found, name = %v", name)
}