128 lines
3.3 KiB
Go
128 lines
3.3 KiB
Go
// Copyright (C) MongoDB, Inc. 2017-present.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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package bsoncodec
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import (
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"fmt"
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"reflect"
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"time"
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"go.mongodb.org/mongo-driver/bson/bsonoptions"
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"go.mongodb.org/mongo-driver/bson/bsonrw"
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"go.mongodb.org/mongo-driver/bson/bsontype"
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"go.mongodb.org/mongo-driver/bson/primitive"
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)
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const (
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timeFormatString = "2006-01-02T15:04:05.999Z07:00"
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)
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// TimeCodec is the Codec used for time.Time values.
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type TimeCodec struct {
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UseLocalTimeZone bool
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}
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var (
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defaultTimeCodec = NewTimeCodec()
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_ ValueCodec = defaultTimeCodec
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_ typeDecoder = defaultTimeCodec
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)
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// NewTimeCodec returns a TimeCodec with options opts.
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func NewTimeCodec(opts ...*bsonoptions.TimeCodecOptions) *TimeCodec {
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timeOpt := bsonoptions.MergeTimeCodecOptions(opts...)
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codec := TimeCodec{}
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if timeOpt.UseLocalTimeZone != nil {
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codec.UseLocalTimeZone = *timeOpt.UseLocalTimeZone
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}
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return &codec
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}
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func (tc *TimeCodec) decodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
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if t != tTime {
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return emptyValue, ValueDecoderError{
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Name: "TimeDecodeValue",
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Types: []reflect.Type{tTime},
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Received: reflect.Zero(t),
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}
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}
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var timeVal time.Time
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switch vrType := vr.Type(); vrType {
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case bsontype.DateTime:
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dt, err := vr.ReadDateTime()
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if err != nil {
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return emptyValue, err
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}
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timeVal = time.Unix(dt/1000, dt%1000*1000000)
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case bsontype.String:
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// assume strings are in the isoTimeFormat
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timeStr, err := vr.ReadString()
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if err != nil {
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return emptyValue, err
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}
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timeVal, err = time.Parse(timeFormatString, timeStr)
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if err != nil {
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return emptyValue, err
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}
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case bsontype.Int64:
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i64, err := vr.ReadInt64()
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if err != nil {
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return emptyValue, err
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}
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timeVal = time.Unix(i64/1000, i64%1000*1000000)
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case bsontype.Timestamp:
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t, _, err := vr.ReadTimestamp()
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if err != nil {
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return emptyValue, err
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}
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timeVal = time.Unix(int64(t), 0)
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case bsontype.Null:
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if err := vr.ReadNull(); err != nil {
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return emptyValue, err
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}
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case bsontype.Undefined:
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if err := vr.ReadUndefined(); err != nil {
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return emptyValue, err
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}
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default:
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return emptyValue, fmt.Errorf("cannot decode %v into a time.Time", vrType)
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}
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if !tc.UseLocalTimeZone {
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timeVal = timeVal.UTC()
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}
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return reflect.ValueOf(timeVal), nil
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}
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// DecodeValue is the ValueDecoderFunc for time.Time.
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func (tc *TimeCodec) DecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
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if !val.CanSet() || val.Type() != tTime {
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return ValueDecoderError{Name: "TimeDecodeValue", Types: []reflect.Type{tTime}, Received: val}
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}
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elem, err := tc.decodeType(dc, vr, tTime)
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if err != nil {
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return err
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}
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val.Set(elem)
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return nil
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}
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// EncodeValue is the ValueEncoderFunc for time.TIme.
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func (tc *TimeCodec) EncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
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if !val.IsValid() || val.Type() != tTime {
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return ValueEncoderError{Name: "TimeEncodeValue", Types: []reflect.Type{tTime}, Received: val}
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}
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tt := val.Interface().(time.Time)
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dt := primitive.NewDateTimeFromTime(tt)
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return vw.WriteDateTime(int64(dt))
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}
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