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duration.go
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duration.go
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// Copyright 2020 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 (
"database/sql"
"database/sql/driver"
"fmt"
"time"
)
var (
_ sql.Scanner = (*DurationSeconds)(nil)
_ driver.Valuer = (*DurationSeconds)(nil)
)
// DurationSeconds is a custom type for writing and reading a time.Duration to be stored
// as seconds in the database.
type DurationSeconds struct {
Duration time.Duration
// AsString allows this value to be updated and parsed using the Update() method.
AsString string
}
func FromDuration(d time.Duration) DurationSeconds {
return DurationSeconds{
Duration: d,
AsString: d.String(),
}
}
func (d *DurationSeconds) Days() int64 {
return int64(d.Duration.Hours() / 24.0)
}
// Update attempts to parse the AsString value and set is as the duration
func (d *DurationSeconds) Update() error {
newDuration, err := time.ParseDuration(d.AsString)
if err != nil {
return err
}
d.Duration = newDuration
return nil
}
// Scan takes a int64 value in seconds and converts that to a time.Duration
func (d *DurationSeconds) Scan(src interface{}) error {
if src == nil {
d.Duration = 0
return nil
}
v, ok := src.(int64)
if !ok {
return fmt.Errorf("invalid scan type")
}
d.Duration = time.Duration(v) * time.Second
d.AsString = d.Duration.String()
return nil
}
// Value converts the internal time.Duration value to seconds and returns
// that value as an int64 for saving to the database.
func (d DurationSeconds) Value() (driver.Value, error) {
v := int64(d.Duration.Seconds())
return v, nil
}