go.chromium.org/luci@v0.0.0-20250314024836-d9a61d0730e6/tokenserver/appengine/impl/utils/revocation/id.go (about)

     1  // Copyright 2017 The LUCI Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package revocation
    16  
    17  import (
    18  	"context"
    19  
    20  	"go.chromium.org/luci/common/retry/transient"
    21  	"go.chromium.org/luci/gae/service/datastore"
    22  )
    23  
    24  // GenerateTokenID produces an int64 that can be used as a token identifier.
    25  //
    26  // We reuse datastore ID generator to produce token ids. The tokens are not
    27  // actually stored in the datastore. The generated ID sequence is associated
    28  // with some entity kind (indicated via 'kind'). If we ever need to restart the
    29  // ID sequence, this kind can be changed.
    30  func GenerateTokenID(c context.Context, kind string) (int64, error) {
    31  	// Note: AllocateIDs modifies passed slice in place, by replacing the keys
    32  	// there.
    33  	keys := []*datastore.Key{
    34  		datastore.NewKey(c, kind, "", 0, nil),
    35  	}
    36  	if err := datastore.AllocateIDs(c, keys); err != nil {
    37  		return 0, transient.Tag.Apply(err)
    38  	}
    39  	return keys[0].IntID(), nil
    40  }