/
bucket.go
193 lines (164 loc) · 4.96 KB
/
bucket.go
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package store
import (
"context"
"encoding/xml"
"github.com/filedag-project/filedag-storage/objectservice/iam/policy"
"github.com/filedag-project/filedag-storage/objectservice/lock"
"github.com/filedag-project/filedag-storage/objectservice/uleveldb"
"github.com/syndtr/goleveldb/leveldb"
"time"
)
const (
bucketPrefix = "bkt/"
)
// BucketPolicyNotFound - no bucket policy found.
type BucketPolicyNotFound struct {
Bucket string
Err error
}
func (e BucketPolicyNotFound) Error() string {
return "No bucket policy configuration found for bucket: " + e.Bucket
}
// BucketNotFound - no bucket found.
type BucketNotFound struct {
Bucket string
Err error
}
func (e BucketNotFound) Error() string {
return "Not found for bucket: " + e.Bucket
}
type BucketTaggingNotFound struct {
Bucket string
Err error
}
func (e BucketTaggingNotFound) Error() string {
return "No bucket tagging configuration found for bucket: " + e.Bucket
}
// BucketMetadataSys captures all bucket metadata for a given cluster.
type BucketMetadataSys struct {
db *uleveldb.ULevelDB
nsLock *lock.NsLockMap
emptyBucket func(ctx context.Context, bucket string) (bool, error)
}
// NewBucketMetadataSys - creates new policy system.
func NewBucketMetadataSys(db *uleveldb.ULevelDB) *BucketMetadataSys {
return &BucketMetadataSys{
db: db,
nsLock: lock.NewNSLock(),
}
}
// Tags is list of tags of XML request/response as per
// https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetBucketTagging.html#API_GetBucketTagging_RequestBody
type Tags tagging
type tagging struct {
XMLName xml.Name `xml:"Tagging"`
TagSet *TagSet `xml:"TagSet"`
}
// TagSet represents list of unique tags.
type TagSet struct {
TagMap map[string]string
IsObject bool
}
// BucketMetadata contains bucket metadata.
type BucketMetadata struct {
Name string
Region string
Owner string
Created time.Time
PolicyConfig *policy.Policy
TaggingConfig *Tags
}
// NewBucketMetadata creates BucketMetadata with the supplied name and Created to Now.
func NewBucketMetadata(name, region, accessKey string) *BucketMetadata {
p := policy.CreateUserBucketPolicy(name, accessKey)
return &BucketMetadata{
Name: name,
Region: region,
Owner: accessKey,
Created: time.Now().UTC(),
PolicyConfig: p,
}
}
// NewNSLock - initialize a new namespace RWLocker instance.
func (sys *BucketMetadataSys) NewNSLock(bucket string) lock.RWLocker {
return sys.nsLock.NewNSLock("meta", bucket)
}
func (sys *BucketMetadataSys) SetEmptyBucket(emptyBucket func(ctx context.Context, bucket string) (bool, error)) {
sys.emptyBucket = emptyBucket
}
// setBucketMeta - sets a new metadata in-db
func (sys *BucketMetadataSys) setBucketMeta(bucket string, meta *BucketMetadata) error {
return sys.db.Put(bucketPrefix+bucket, meta)
}
// CreateBucket - create a new Bucket
func (sys *BucketMetadataSys) CreateBucket(ctx context.Context, bucket, region, accessKey string) error {
lk := sys.NewNSLock(bucket)
lkctx, err := lk.GetLock(ctx, globalOperationTimeout)
if err != nil {
return err
}
ctx = lkctx.Context()
defer lk.Unlock(lkctx.Cancel)
return sys.setBucketMeta(bucket, NewBucketMetadata(bucket, region, accessKey))
}
func (sys *BucketMetadataSys) getBucketMeta(bucket string) (meta BucketMetadata, err error) {
err = sys.db.Get(bucketPrefix+bucket, &meta)
if err == leveldb.ErrNotFound {
err = BucketNotFound{Bucket: bucket, Err: err}
}
return meta, err
}
// GetBucketMeta metadata for a bucket.
func (sys *BucketMetadataSys) GetBucketMeta(ctx context.Context, bucket string) (meta BucketMetadata, err error) {
lk := sys.NewNSLock(bucket)
lkctx, err := lk.GetRLock(ctx, globalOperationTimeout)
if err != nil {
return BucketMetadata{}, err
}
ctx = lkctx.Context()
defer lk.RUnlock(lkctx.Cancel)
return sys.getBucketMeta(bucket)
}
// HasBucket metadata for a bucket.
func (sys *BucketMetadataSys) HasBucket(ctx context.Context, bucket string) bool {
_, err := sys.GetBucketMeta(ctx, bucket)
return err == nil
}
// DeleteBucket bucket.
func (sys *BucketMetadataSys) DeleteBucket(ctx context.Context, bucket string) error {
lk := sys.NewNSLock(bucket)
lkctx, err := lk.GetLock(ctx, deleteOperationTimeout)
if err != nil {
return err
}
ctx = lkctx.Context()
defer lk.Unlock(lkctx.Cancel)
if _, err = sys.getBucketMeta(bucket); err != nil {
return err
}
if empty, err := sys.emptyBucket(ctx, bucket); err != nil {
return err
} else if !empty {
return ErrBucketNotEmpty
}
return sys.db.Delete(bucketPrefix + bucket)
}
// GetAllBucketsOfUser metadata for all bucket.
func (sys *BucketMetadataSys) GetAllBucketsOfUser(ctx context.Context, username string) ([]BucketMetadata, error) {
var m []BucketMetadata
all, err := sys.db.ReadAllChan(ctx, bucketPrefix, "")
if err != nil {
return nil, err
}
for entry := range all {
data := BucketMetadata{}
if err = entry.UnmarshalValue(&data); err != nil {
continue
}
if data.Owner != username {
continue
}
m = append(m, data)
}
return m, nil
}