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/
realm_chaff_event.go
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/
realm_chaff_event.go
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// Copyright 2021 the Exposure Notifications Verification Server authors
//
// 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 database
import (
"fmt"
"time"
"github.com/google/exposure-notifications-server/pkg/timeutils"
)
// RealmChaffEvent is a record that indicates a realm received a chaff event on
// the given date.
type RealmChaffEvent struct {
// RealmID is the realm for which the chaff request existed.
RealmID uint
// Date is the UTC date (truncated to midnight) for which one or more chaff
// request existed.
Date time.Time
// Present indicates whether the chaff event was present.
Present bool
}
// HasRealmChaffEventsMap returns a map of realm IDs that have any chaff events.
func (db *Database) HasRealmChaffEventsMap() (map[uint]bool, error) {
var ids []uint
if err := db.db.
Model(&RealmChaffEvent{}).
Select("DISTINCT(realm_id) AS realm_id").
Pluck("realm_id", &ids).
Error; err != nil {
return nil, fmt.Errorf("failed to pluck ids: %w", err)
}
// This has to be a bool because go text/template doesn't work with struct{}.
m := make(map[uint]bool, len(ids))
for _, id := range ids {
m[id] = true
}
return m, nil
}
// PurgeRealmChaffEvents will delete realm chaff events that have exceeded the
// storage lifetime.
func (db *Database) PurgeRealmChaffEvents(maxAge time.Duration) (int64, error) {
if maxAge > 0 {
maxAge = -1 * maxAge
}
deleteBefore := timeutils.UTCMidnight(time.Now().UTC()).Add(maxAge)
result := db.db.
Unscoped().
Where("date < ?", deleteBefore).
Delete(&RealmChaffEvent{})
return result.RowsAffected, result.Error
}