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minio/cmd/lifecycle.go

191 lines
5.2 KiB

/*
* MinIO Cloud Storage, (C) 2019 MinIO, 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 cmd
import (
"bytes"
"context"
"encoding/xml"
"path"
"strings"
"sync"
"time"
"github.com/minio/minio-go/pkg/set"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/lifecycle"
)
const (
// Disabled means the lifecycle rule is inactive
Disabled = "Disabled"
)
// LifecycleSys - Bucket lifecycle subsystem.
type LifecycleSys struct {
sync.RWMutex
bucketLifecycleMap map[string]lifecycle.Lifecycle
}
// Set - sets lifecycle config to given bucket name.
func (sys *LifecycleSys) Set(bucketName string, lifecycle lifecycle.Lifecycle) {
sys.Lock()
defer sys.Unlock()
sys.bucketLifecycleMap[bucketName] = lifecycle
}
func saveLifecycleConfig(ctx context.Context, objAPI ObjectLayer, bucketName string, bucketLifecycle *lifecycle.Lifecycle) error {
data, err := xml.Marshal(bucketLifecycle)
if err != nil {
return err
}
// Construct path to lifecycle.xml for the given bucket.
configFile := path.Join(bucketConfigPrefix, bucketName, bucketLifecycleConfig)
return saveConfig(ctx, objAPI, configFile, data)
}
// getLifecycleConfig - get lifecycle config for given bucket name.
func getLifecycleConfig(objAPI ObjectLayer, bucketName string) (*lifecycle.Lifecycle, error) {
// Construct path to lifecycle.xml for the given bucket.
configFile := path.Join(bucketConfigPrefix, bucketName, bucketLifecycleConfig)
configData, err := readConfig(context.Background(), objAPI, configFile)
if err != nil {
if err == errConfigNotFound {
err = BucketLifecycleNotFound{Bucket: bucketName}
}
return nil, err
}
return lifecycle.ParseLifecycleConfig(bytes.NewReader(configData))
}
func removeLifecycleConfig(ctx context.Context, objAPI ObjectLayer, bucketName string) error {
// Construct path to lifecycle.xml for the given bucket.
configFile := path.Join(bucketConfigPrefix, bucketName, bucketLifecycleConfig)
if err := objAPI.DeleteObject(ctx, minioMetaBucket, configFile); err != nil {
if _, ok := err.(ObjectNotFound); ok {
return BucketLifecycleNotFound{Bucket: bucketName}
}
return err
}
return nil
}
// NewLifecycleSys - creates new lifecycle system.
func NewLifecycleSys() *LifecycleSys {
return &LifecycleSys{
bucketLifecycleMap: make(map[string]lifecycle.Lifecycle),
}
}
// Init - initializes lifecycle system from lifecycle.xml of all buckets.
func (sys *LifecycleSys) Init(objAPI ObjectLayer) error {
if objAPI == nil {
return errServerNotInitialized
}
defer func() {
// Refresh LifecycleSys in background.
go func() {
ticker := time.NewTicker(globalRefreshBucketLifecycleInterval)
defer ticker.Stop()
for {
select {
case <-GlobalServiceDoneCh:
return
case <-ticker.C:
sys.refresh(objAPI)
}
}
}()
}()
doneCh := make(chan struct{})
defer close(doneCh)
// Initializing lifecycle needs a retry mechanism for
// the following reasons:
// - Read quorum is lost just after the initialization
// of the object layer.
for range newRetryTimerSimple(doneCh) {
// Load LifecycleSys once during boot.
if err := sys.refresh(objAPI); err != nil {
if err == errDiskNotFound ||
strings.Contains(err.Error(), InsufficientReadQuorum{}.Error()) ||
strings.Contains(err.Error(), InsufficientWriteQuorum{}.Error()) {
logger.Info("Waiting for lifecycle subsystem to be initialized..")
continue
}
return err
}
break
}
return nil
}
// Refresh LifecycleSys.
func (sys *LifecycleSys) refresh(objAPI ObjectLayer) error {
buckets, err := objAPI.ListBuckets(context.Background())
if err != nil {
logger.LogIf(context.Background(), err)
return err
}
sys.removeDeletedBuckets(buckets)
for _, bucket := range buckets {
config, err := objAPI.GetBucketLifecycle(context.Background(), bucket.Name)
if err != nil {
if _, ok := err.(BucketLifecycleNotFound); ok {
sys.Remove(bucket.Name)
}
continue
}
sys.Set(bucket.Name, *config)
}
return nil
}
// removeDeletedBuckets - to handle a corner case where we have cached the lifecycle for a deleted
// bucket. i.e if we miss a delete-bucket notification we should delete the corresponding
// bucket policy during sys.refresh()
func (sys *LifecycleSys) removeDeletedBuckets(bucketInfos []BucketInfo) {
buckets := set.NewStringSet()
for _, info := range bucketInfos {
buckets.Add(info.Name)
}
sys.Lock()
defer sys.Unlock()
for bucket := range sys.bucketLifecycleMap {
if !buckets.Contains(bucket) {
delete(sys.bucketLifecycleMap, bucket)
}
}
}
// Remove - removes policy for given bucket name.
func (sys *LifecycleSys) Remove(bucketName string) {
sys.Lock()
defer sys.Unlock()
delete(sys.bucketLifecycleMap, bucketName)
}