forked from go-swagger/go-swagger
/
duration.go
143 lines (123 loc) · 3.46 KB
/
duration.go
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// Copyright 2015 go-swagger maintainers
//
// 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 strfmt
import (
"database/sql/driver"
"fmt"
"regexp"
"strconv"
"strings"
"time"
)
func init() {
d := Duration(0)
Default.Add("duration", &d, IsDuration)
}
var (
timeUnits = [][]string{
[]string{"ns", "nano"},
[]string{"us", "µs", "micro"},
[]string{"ms", "milli"},
[]string{"s", "sec"},
[]string{"m", "min"},
[]string{"h", "hr", "hour"},
[]string{"d", "day"},
[]string{"w", "wk", "week"},
}
timeMultiplier = map[string]time.Duration{
"ns": time.Nanosecond,
"us": time.Microsecond,
"ms": time.Millisecond,
"s": time.Second,
"m": time.Minute,
"h": time.Hour,
"d": 24 * time.Hour,
"w": 7 * 24 * time.Hour,
}
durationMatcher = regexp.MustCompile(`((\d+)\s*([A-Za-zµ]+))`)
)
// IsDuration returns true if the provided string is a valid duration
func IsDuration(str string) bool {
_, err := ParseDuration(str)
return err == nil
}
// Duration represents a duration
//
// swagger:strfmt duration
type Duration time.Duration
// MarshalText turns this instance into text
func (d Duration) MarshalText() ([]byte, error) {
return []byte(time.Duration(d).String()), nil
}
// UnmarshalText hydrates this instance from text
func (d *Duration) UnmarshalText(data []byte) error { // validation is performed later on
dd, err := ParseDuration(string(data))
if err != nil {
return err
}
*d = Duration(dd)
return nil
}
// ParseDuration parses a duration from a string, compatible with scala duration syntax
func ParseDuration(cand string) (time.Duration, error) {
if dur, err := time.ParseDuration(cand); err == nil {
return dur, nil
}
var dur time.Duration
ok := false
for _, match := range durationMatcher.FindAllStringSubmatch(cand, -1) {
factor, err := strconv.Atoi(match[2]) // converts string to int
if err != nil {
return 0, err
}
unit := strings.ToLower(strings.TrimSpace(match[3]))
for _, variants := range timeUnits {
last := len(variants) - 1
multiplier := timeMultiplier[variants[0]]
for i, variant := range variants {
if (last == i && strings.HasPrefix(unit, variant)) || strings.EqualFold(variant, unit) {
ok = true
dur += (time.Duration(factor) * multiplier)
}
}
}
}
if ok {
return dur, nil
}
return 0, fmt.Errorf("Unable to parse %s as duration", cand)
}
// Scan reads a Duration value from database driver type.
func (d *Duration) Scan(raw interface{}) error {
switch v := raw.(type) {
// TODO: case []byte: // ?
case int64:
*d = Duration(v)
case float64:
*d = Duration(int64(v))
case nil:
*d = Duration(0)
default:
return fmt.Errorf("cannot sql.Scan() strfmt.Duration from: %#v", v)
}
return nil
}
// Value converts Duration to a primitive value ready to written to a database.
func (d Duration) Value() (driver.Value, error) {
return driver.Value(int64(d)), nil
}
// String converts this duration to a string
func (d Duration) String() string {
return time.Duration(d).String()
}