/
transition.go
178 lines (153 loc) · 5.15 KB
/
transition.go
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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package lifecycle
import (
"encoding/xml"
"time"
)
var (
errTransitionInvalidDays = Errorf("Days must be 0 or greater when used with Transition")
errTransitionInvalidDate = Errorf("Date must be provided in ISO 8601 format")
errTransitionInvalid = Errorf("Exactly one of Days (0 or greater) or Date (positive ISO 8601 format) should be present in Transition.")
errTransitionDateNotMidnight = Errorf("'Date' must be at midnight GMT")
)
// TransitionDate is a embedded type containing time.Time to unmarshal
// Date in Transition
type TransitionDate struct {
time.Time
}
// UnmarshalXML parses date from Transition and validates date format
func (tDate *TransitionDate) UnmarshalXML(d *xml.Decoder, startElement xml.StartElement) error {
var dateStr string
err := d.DecodeElement(&dateStr, &startElement)
if err != nil {
return err
}
// While AWS documentation mentions that the date specified
// must be present in ISO 8601 format, in reality they allow
// users to provide RFC 3339 compliant dates.
trnDate, err := time.Parse(time.RFC3339, dateStr)
if err != nil {
return errTransitionInvalidDate
}
// Allow only date timestamp specifying midnight GMT
hr, min, sec := trnDate.Clock()
nsec := trnDate.Nanosecond()
loc := trnDate.Location()
if !(hr == 0 && min == 0 && sec == 0 && nsec == 0 && loc.String() == time.UTC.String()) {
return errTransitionDateNotMidnight
}
*tDate = TransitionDate{trnDate}
return nil
}
// MarshalXML encodes expiration date if it is non-zero and encodes
// empty string otherwise
func (tDate TransitionDate) MarshalXML(e *xml.Encoder, startElement xml.StartElement) error {
if tDate.Time.IsZero() {
return nil
}
return e.EncodeElement(tDate.Format(time.RFC3339), startElement)
}
// TransitionDays is a type alias to unmarshal Days in Transition
type TransitionDays int
// UnmarshalXML parses number of days from Transition and validates if
// >= 0
func (tDays *TransitionDays) UnmarshalXML(d *xml.Decoder, startElement xml.StartElement) error {
var days int
err := d.DecodeElement(&days, &startElement)
if err != nil {
return err
}
if days < 0 {
return errTransitionInvalidDays
}
*tDays = TransitionDays(days)
return nil
}
// MarshalXML encodes number of days to expire if it is non-zero and
// encodes empty string otherwise
func (tDays TransitionDays) MarshalXML(e *xml.Encoder, startElement xml.StartElement) error {
return e.EncodeElement(int(tDays), startElement)
}
// Transition - transition actions for a rule in lifecycle configuration.
type Transition struct {
XMLName xml.Name `xml:"Transition"`
Days TransitionDays `xml:"Days,omitempty"`
Date TransitionDate `xml:"Date,omitempty"`
StorageClass string `xml:"StorageClass,omitempty"`
set bool
}
// IsEnabled returns if transition is enabled.
func (t Transition) IsEnabled() bool {
return t.set
}
// MarshalXML encodes transition field into an XML form.
func (t Transition) MarshalXML(enc *xml.Encoder, start xml.StartElement) error {
if !t.set {
return nil
}
type transitionWrapper Transition
return enc.EncodeElement(transitionWrapper(t), start)
}
// UnmarshalXML decodes transition field from the XML form.
func (t *Transition) UnmarshalXML(d *xml.Decoder, startElement xml.StartElement) error {
type transitionWrapper Transition
var trw transitionWrapper
err := d.DecodeElement(&trw, &startElement)
if err != nil {
return err
}
*t = Transition(trw)
t.set = true
return nil
}
// Validate - validates the "Transition" element
func (t Transition) Validate() error {
if !t.set {
return nil
}
if !t.IsDateNull() && t.Days > 0 {
return errTransitionInvalid
}
if t.StorageClass == "" {
return errXMLNotWellFormed
}
return nil
}
// IsDateNull returns true if date field is null
func (t Transition) IsDateNull() bool {
return t.Date.Time.IsZero()
}
// IsNull returns true if both date and days fields are null
func (t Transition) IsNull() bool {
return t.StorageClass == ""
}
// NextDue returns upcoming transition date for obj and true if applicable,
// returns false otherwise.
func (t Transition) NextDue(obj ObjectOpts) (time.Time, bool) {
if !obj.IsLatest || t.IsNull() {
return time.Time{}, false
}
if !t.IsDateNull() {
return t.Date.Time, true
}
// Days == 0 indicates immediate tiering, i.e object is eligible for tiering since its creation.
if t.Days == 0 {
return obj.ModTime, true
}
return ExpectedExpiryTime(obj.ModTime, int(t.Days)), true
}