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datetime.go
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datetime.go
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// Copyright 2022 Dolthub, Inc.
//
// 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 types
import (
"math"
"reflect"
"time"
"github.com/dolthub/vitess/go/sqltypes"
"github.com/dolthub/vitess/go/vt/proto/query"
"github.com/shopspring/decimal"
"gopkg.in/src-d/go-errors.v1"
"github.com/gabereiser/go-mysql-server/sql"
)
const zeroDateStr = "0000-00-00"
const zeroTimestampDatetimeStr = "0000-00-00 00:00:00"
var (
// ErrConvertingToTime is thrown when a value cannot be converted to a Time
ErrConvertingToTime = errors.NewKind("Incorrect datetime value: '%s'")
ErrConvertingToTimeOutOfRange = errors.NewKind("value %q is outside of %v range")
// datetimeTypeMaxDatetime is the maximum representable Datetime/Date value.
datetimeTypeMaxDatetime = time.Date(9999, 12, 31, 23, 59, 59, 999999000, time.UTC)
// datetimeTypeMinDatetime is the minimum representable Datetime/Date value.
datetimeTypeMinDatetime = time.Date(0, 1, 1, 0, 0, 0, 0, time.UTC)
// datetimeTypeMaxTimestamp is the maximum representable Timestamp value, which is the maximum 32-bit integer as a Unix time.
datetimeTypeMaxTimestamp = time.Unix(math.MaxInt32, 999999000)
// datetimeTypeMinTimestamp is the minimum representable Timestamp value, which is one second past the epoch.
datetimeTypeMinTimestamp = time.Unix(1, 0)
// TimestampDatetimeLayouts hold extra timestamps allowed for parsing. It does
// not have all the layouts supported by mysql. Missing are two digit year
// versions of common cases and dates that use non common separators.
//
// https://github.com/MariaDB/server/blob/mysql-5.5.36/sql-common/my_time.c#L124
TimestampDatetimeLayouts = []string{
"2006-01-02 15:4",
"2006-01-02 15:04",
"2006-01-02 15:04:",
"2006-01-02 15:04:.",
"2006-01-02 15:04:05.",
"2006-01-02 15:04:05.999999",
"2006-01-02",
"2006-1-2",
"2006-1-2 15:4:5.999999",
time.RFC3339,
time.RFC3339Nano,
"2006-01-02T15:04:05",
"20060102150405",
"20060102",
"2006/01/02",
"2006-01-02 15:04:05.999999999 -0700 MST", // represents standard Time.time.UTC()
}
// zeroTime is 0000-01-01 00:00:00 UTC which is the closest Go can get to 0000-00-00 00:00:00
zeroTime = time.Unix(-62167219200, 0).UTC()
// Date is a date with day, month and year.
Date = MustCreateDatetimeType(sqltypes.Date)
// Datetime is a date and a time
Datetime = MustCreateDatetimeType(sqltypes.Datetime)
// Timestamp is an UNIX timestamp.
Timestamp = MustCreateDatetimeType(sqltypes.Timestamp)
datetimeValueType = reflect.TypeOf(time.Time{})
)
type datetimeType struct {
baseType query.Type
}
// CreateDatetimeType creates a Type dealing with all temporal types that are not TIME nor YEAR.
func CreateDatetimeType(baseType query.Type) (sql.DatetimeType, error) {
switch baseType {
case sqltypes.Date, sqltypes.Datetime, sqltypes.Timestamp:
return datetimeType{
baseType: baseType,
}, nil
}
return nil, sql.ErrInvalidBaseType.New(baseType.String(), "datetime")
}
// MustCreateDatetimeType is the same as CreateDatetimeType except it panics on errors.
func MustCreateDatetimeType(baseType query.Type) sql.DatetimeType {
dt, err := CreateDatetimeType(baseType)
if err != nil {
panic(err)
}
return dt
}
// Compare implements Type interface.
func (t datetimeType) Compare(a interface{}, b interface{}) (int, error) {
if hasNulls, res := CompareNulls(a, b); hasNulls {
return res, nil
}
var at time.Time
var bt time.Time
var ok bool
var err error
if at, ok = a.(time.Time); !ok {
at, err = ConvertToTime(a, t)
if err != nil {
return 0, err
}
} else if t.baseType == sqltypes.Date {
at = at.Truncate(24 * time.Hour)
}
if bt, ok = b.(time.Time); !ok {
bt, err = ConvertToTime(b, t)
if err != nil {
return 0, err
}
} else if t.baseType == sqltypes.Date {
bt = bt.Truncate(24 * time.Hour)
}
if at.Before(bt) {
return -1, nil
} else if at.After(bt) {
return 1, nil
}
return 0, nil
}
// Convert implements Type interface.
func (t datetimeType) Convert(v interface{}) (interface{}, error) {
if v == nil {
return nil, nil
}
res, err := ConvertToTime(v, t)
if err != nil {
return nil, err
}
return res, nil
}
func ConvertToTime(v interface{}, t datetimeType) (time.Time, error) {
if v == nil {
return time.Time{}, nil
}
res, err := t.ConvertWithoutRangeCheck(v)
if err != nil {
return time.Time{}, err
}
if res.Equal(zeroTime) {
return zeroTime, nil
}
switch t.baseType {
case sqltypes.Date:
if res.Year() < 0 || res.Year() > 9999 {
return time.Time{}, ErrConvertingToTimeOutOfRange.New(res.Format(sql.DateLayout), t.String())
}
case sqltypes.Datetime:
if res.Year() < 0 || res.Year() > 9999 {
return time.Time{}, ErrConvertingToTimeOutOfRange.New(res.Format(sql.TimestampDatetimeLayout), t.String())
}
case sqltypes.Timestamp:
if res.Before(datetimeTypeMinTimestamp) || res.After(datetimeTypeMaxTimestamp) {
return time.Time{}, ErrConvertingToTimeOutOfRange.New(res.Format(sql.TimestampDatetimeLayout), t.String())
}
}
return res, nil
}
// ConvertWithoutRangeCheck converts the parameter to time.Time without checking the range.
func (t datetimeType) ConvertWithoutRangeCheck(v interface{}) (time.Time, error) {
var res time.Time
if bs, ok := v.([]byte); ok {
v = string(bs)
}
switch value := v.(type) {
case string:
if value == zeroDateStr || value == zeroTimestampDatetimeStr {
return zeroTime, nil
}
// TODO: consider not using time.Parse if we want to match MySQL exactly ('2010-06-03 11:22.:.:.:.:' is a valid timestamp)
parsed := false
for _, fmt := range TimestampDatetimeLayouts {
if t, err := time.Parse(fmt, value); err == nil {
res = t.UTC()
parsed = true
break
}
}
if !parsed {
return zeroTime, ErrConvertingToTime.New(v)
}
case time.Time:
res = value.UTC()
// For most integer values, we just return an error (but MySQL is more lenient for some of these). A special case
// is zero values, which are important when converting from postgres defaults.
case int:
if value == 0 {
return zeroTime, nil
}
return zeroTime, ErrConvertingToTime.New(v)
case int8:
if value == 0 {
return zeroTime, nil
}
return zeroTime, ErrConvertingToTime.New(v)
case int16:
if value == 0 {
return zeroTime, nil
}
return zeroTime, ErrConvertingToTime.New(v)
case int32:
if value == 0 {
return zeroTime, nil
}
return zeroTime, ErrConvertingToTime.New(v)
case int64:
if value == 0 {
return zeroTime, nil
}
return zeroTime, ErrConvertingToTime.New(v)
case uint:
if value == 0 {
return zeroTime, nil
}
return zeroTime, ErrConvertingToTime.New(v)
case uint8:
if value == 0 {
return zeroTime, nil
}
return zeroTime, ErrConvertingToTime.New(v)
case uint16:
if value == 0 {
return zeroTime, nil
}
return zeroTime, ErrConvertingToTime.New(v)
case uint32:
if value == 0 {
return zeroTime, nil
}
return zeroTime, ErrConvertingToTime.New(v)
case uint64:
if value == 0 {
return zeroTime, nil
}
return zeroTime, ErrConvertingToTime.New(v)
case float32:
if value == 0 {
return zeroTime, nil
}
return zeroTime, ErrConvertingToTime.New(v)
case float64:
if value == 0 {
return zeroTime, nil
}
return zeroTime, ErrConvertingToTime.New(v)
case decimal.Decimal:
if value.IsZero() {
return zeroTime, nil
}
return zeroTime, ErrConvertingToTime.New(v)
case decimal.NullDecimal:
if value.Valid && value.Decimal.IsZero() {
return zeroTime, nil
}
return zeroTime, ErrConvertingToTime.New(v)
case Timespan:
// when receiving TIME, MySQL fills in date with today
nowTimeStr := sql.Now().Format("2006-01-02")
nowTime, err := time.Parse("2006-01-02", nowTimeStr)
if err != nil {
return zeroTime, ErrConvertingToTime.New(v)
}
return nowTime.Add(value.AsTimeDuration()), nil
default:
return zeroTime, sql.ErrConvertToSQL.New(t)
}
if t.baseType == sqltypes.Date {
res = res.Truncate(24 * time.Hour)
}
return res, nil
}
func (t datetimeType) MustConvert(v interface{}) interface{} {
value, err := t.Convert(v)
if err != nil {
panic(err)
}
return value
}
// Equals implements the Type interface.
func (t datetimeType) Equals(otherType sql.Type) bool {
return t.baseType == otherType.Type()
}
// MaxTextResponseByteLength implements the Type interface
func (t datetimeType) MaxTextResponseByteLength() uint32 {
switch t.baseType {
case sqltypes.Date:
return uint32(len(sql.DateLayout))
case sqltypes.Datetime, sqltypes.Timestamp:
return uint32(len(sql.TimestampDatetimeLayout))
default:
panic(sql.ErrInvalidBaseType.New(t.baseType.String(), "datetime"))
}
}
// Promote implements the Type interface.
func (t datetimeType) Promote() sql.Type {
return Datetime
}
// SQL implements Type interface.
func (t datetimeType) SQL(ctx *sql.Context, dest []byte, v interface{}) (sqltypes.Value, error) {
if v == nil {
return sqltypes.NULL, nil
}
v, err := t.Convert(v)
if err != nil {
return sqltypes.Value{}, err
}
vt := v.(time.Time)
var typ query.Type
var val string
switch t.baseType {
case sqltypes.Date:
typ = sqltypes.Date
if vt.Equal(zeroTime) {
val = vt.Format(zeroDateStr)
} else {
val = vt.Format(sql.DateLayout)
}
case sqltypes.Datetime:
typ = sqltypes.Datetime
if vt.Equal(zeroTime) {
val = vt.Format(zeroTimestampDatetimeStr)
} else {
val = vt.Format(sql.TimestampDatetimeLayout)
}
case sqltypes.Timestamp:
typ = sqltypes.Timestamp
if vt.Equal(zeroTime) {
val = vt.Format(zeroTimestampDatetimeStr)
} else {
val = vt.Format(sql.TimestampDatetimeLayout)
}
default:
panic(sql.ErrInvalidBaseType.New(t.baseType.String(), "datetime"))
}
valBytes := AppendAndSliceString(dest, val)
return sqltypes.MakeTrusted(typ, valBytes), nil
}
func (t datetimeType) String() string {
switch t.baseType {
case sqltypes.Date:
return "date"
case sqltypes.Datetime:
return "datetime"
case sqltypes.Timestamp:
return "timestamp"
default:
panic(sql.ErrInvalidBaseType.New(t.baseType.String(), "datetime"))
}
}
// Type implements Type interface.
func (t datetimeType) Type() query.Type {
return t.baseType
}
// ValueType implements Type interface.
func (t datetimeType) ValueType() reflect.Type {
return datetimeValueType
}
func (t datetimeType) Zero() interface{} {
return zeroTime
}
// MaximumTime is the latest accepted time for this type.
func (t datetimeType) MaximumTime() time.Time {
if t.baseType == sqltypes.Timestamp {
return datetimeTypeMaxTimestamp
}
return datetimeTypeMaxDatetime
}
// MinimumTime is the earliest accepted time for this type.
func (t datetimeType) MinimumTime() time.Time {
if t.baseType == sqltypes.Timestamp {
return datetimeTypeMinTimestamp
}
return datetimeTypeMinDatetime
}
// ValidateTime receives a time and returns either that time or nil if it's
// not a valid time.
func ValidateTime(t time.Time) interface{} {
if t.After(time.Date(9999, time.December, 31, 23, 59, 59, 999999999, time.UTC)) {
return nil
}
return t
}