144 lines
3.7 KiB
Go
144 lines
3.7 KiB
Go
/*
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Copyright 2021 The Dapr Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package metadata
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// JSON marshaling and unmarshaling methods for time.Duration based on https://stackoverflow.com/a/48051946
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// Includes methods to return an ISO-8601 formatted string from a time.Duration.
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import (
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"encoding/json"
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"errors"
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"reflect"
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"strconv"
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"time"
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"github.com/mitchellh/mapstructure"
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)
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type Duration struct {
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time.Duration
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}
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func (d Duration) MarshalJSON() ([]byte, error) {
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return json.Marshal(d.String())
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}
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func (d *Duration) UnmarshalJSON(b []byte) error {
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var v interface{}
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if err := json.Unmarshal(b, &v); err != nil {
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return err
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}
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switch value := v.(type) {
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case float64:
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d.Duration = time.Duration(value)
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return nil
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case string:
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var err error
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d.Duration, err = time.ParseDuration(value)
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if err != nil {
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return err
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}
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return nil
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default:
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return errors.New("invalid duration")
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}
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}
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// This helper function is used to decode durations within a map[string]interface{} into a struct.
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// It must be used in conjunction with mapstructure's DecodeHook.
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// This is used in utils.DecodeMetadata to decode durations in metadata.
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//
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// mapstructure.NewDecoder(&mapstructure.DecoderConfig{
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// DecodeHook: mapstructure.ComposeDecodeHookFunc(
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// toTimeDurationHookFunc()),
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// Metadata: nil,
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// Result: result,
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// })
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func toTimeDurationHookFunc() mapstructure.DecodeHookFunc {
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return func(
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f reflect.Type,
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t reflect.Type,
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data interface{},
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) (interface{}, error) {
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if t != reflect.TypeOf(Duration{}) && t != reflect.TypeOf(time.Duration(0)) {
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return data, nil
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}
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switch f.Kind() {
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case reflect.String:
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val, err := time.ParseDuration(data.(string))
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if err != nil {
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return nil, err
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}
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if t != reflect.TypeOf(Duration{}) {
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return val, nil
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}
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return Duration{Duration: val}, nil
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case reflect.Float64:
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val := time.Duration(data.(float64))
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if t != reflect.TypeOf(Duration{}) {
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return val, nil
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}
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return Duration{Duration: val}, nil
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case reflect.Int64:
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val := time.Duration(data.(int64))
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if t != reflect.TypeOf(Duration{}) {
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return val, nil
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}
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return Duration{Duration: val}, nil
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default:
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return data, nil
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}
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}
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}
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// ToISOString returns the duration formatted as a ISO-8601 duration string (-ish).
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// This methods supports days, hours, minutes, and seconds. It assumes all durations are in UTC time and are not impacted by DST (so all days are 24-hours long).
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// This method does not support fractions of seconds, and durations are truncated to seconds.
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// See https://en.wikipedia.org/wiki/ISO_8601#Durations for referece.
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func (d Duration) ToISOString() string {
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// Truncate to seconds, removing fractional seconds
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trunc := d.Truncate(time.Second)
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seconds := int64(trunc.Seconds())
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if seconds == 0 {
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// Zero value
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return "P0D"
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}
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res := "P"
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if seconds >= 86400 {
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res += strconv.FormatInt(seconds/86400, 10) + "D"
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seconds %= 86400
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}
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if seconds == 0 {
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// Short-circuit if there's nothing left (we had whole days only)
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return res
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}
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res += "T"
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if seconds >= 3600 {
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res += strconv.FormatInt(seconds/3600, 10) + "H"
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seconds %= 3600
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}
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if seconds >= 60 {
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res += strconv.FormatInt(seconds/60, 10) + "M"
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seconds %= 60
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}
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if seconds > 0 {
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res += strconv.FormatInt(seconds, 10) + "S"
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}
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return res
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}
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