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bucket_metadata.go
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bucket_metadata.go
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package s3api
import (
"encoding/json"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
"github.com/seaweedfs/seaweedfs/weed/s3api/s3_constants"
"github.com/seaweedfs/seaweedfs/weed/s3api/s3err"
"github.com/seaweedfs/seaweedfs/weed/util"
"math"
"sync"
)
var loadBucketMetadataFromFiler = func(r *BucketRegistry, bucketName string) (*BucketMetaData, error) {
entry, err := filer_pb.GetEntry(r.s3a, util.NewFullPath(r.s3a.option.BucketsPath, bucketName))
if err != nil {
return nil, err
}
return buildBucketMetadata(r.s3a.iam, entry), nil
}
type BucketMetaData struct {
_ struct{} `type:"structure"`
Name string
//By default, when another AWS account uploads an object to S3 bucket,
//that account (the object writer) owns the object, has access to it, and
//can grant other users access to it through ACLs. You can use Object Ownership
//to change this default behavior so that ACLs are disabled and you, as the
//bucket owner, automatically own every object in your bucket.
ObjectOwnership string
// Container for the bucket owner's display name and ID.
Owner *s3.Owner `type:"structure"`
// A list of grants for access controls.
Acl []*s3.Grant `locationName:"AccessControlList" locationNameList:"Grant" type:"list"`
}
type BucketRegistry struct {
metadataCache map[string]*BucketMetaData
metadataCacheLock sync.RWMutex
notFound map[string]struct{}
notFoundLock sync.RWMutex
s3a *S3ApiServer
}
func NewBucketRegistry(s3a *S3ApiServer) *BucketRegistry {
br := &BucketRegistry{
metadataCache: make(map[string]*BucketMetaData),
notFound: make(map[string]struct{}),
s3a: s3a,
}
err := br.init()
if err != nil {
glog.Fatal("init bucket registry failed", err)
return nil
}
return br
}
func (r *BucketRegistry) init() error {
err := filer_pb.List(r.s3a, r.s3a.option.BucketsPath, "", func(entry *filer_pb.Entry, isLast bool) error {
r.LoadBucketMetadata(entry)
return nil
}, "", false, math.MaxUint32)
return err
}
func (r *BucketRegistry) LoadBucketMetadata(entry *filer_pb.Entry) {
bucketMetadata := buildBucketMetadata(r.s3a.iam, entry)
r.metadataCacheLock.Lock()
defer r.metadataCacheLock.Unlock()
r.metadataCache[entry.Name] = bucketMetadata
}
func buildBucketMetadata(accountManager AccountManager, entry *filer_pb.Entry) *BucketMetaData {
entryJson, _ := json.Marshal(entry)
glog.V(3).Infof("build bucket metadata,entry=%s", entryJson)
bucketMetadata := &BucketMetaData{
Name: entry.Name,
//Default ownership: OwnershipBucketOwnerEnforced, which means Acl is disabled
ObjectOwnership: s3_constants.OwnershipBucketOwnerEnforced,
// Default owner: `AccountAdmin`
Owner: &s3.Owner{
ID: &AccountAdmin.Id,
DisplayName: &AccountAdmin.DisplayName,
},
}
if entry.Extended != nil {
//ownership control
ownership, ok := entry.Extended[s3_constants.ExtOwnershipKey]
if ok {
ownership := string(ownership)
valid := s3_constants.ValidateOwnership(ownership)
if valid {
bucketMetadata.ObjectOwnership = ownership
} else {
glog.Warningf("Invalid ownership: %s, bucket: %s", ownership, bucketMetadata.Name)
}
}
//access control policy
//owner
acpOwnerBytes, ok := entry.Extended[s3_constants.ExtAmzOwnerKey]
if ok && len(acpOwnerBytes) > 0 {
ownerAccountId := string(acpOwnerBytes)
ownerAccountName := accountManager.GetAccountNameById(ownerAccountId)
if ownerAccountName == "" {
glog.Warningf("owner[id=%s] is invalid, bucket: %s", ownerAccountId, bucketMetadata.Name)
} else {
bucketMetadata.Owner = &s3.Owner{
ID: &ownerAccountId,
DisplayName: &ownerAccountName,
}
}
}
//grants
acpGrantsBytes, ok := entry.Extended[s3_constants.ExtAmzAclKey]
if ok && len(acpGrantsBytes) > 0 {
var grants []*s3.Grant
err := json.Unmarshal(acpGrantsBytes, &grants)
if err == nil {
bucketMetadata.Acl = grants
} else {
glog.Warningf("Unmarshal ACP grants: %s(%v), bucket: %s", string(acpGrantsBytes), err, bucketMetadata.Name)
}
}
}
return bucketMetadata
}
func (r *BucketRegistry) RemoveBucketMetadata(entry *filer_pb.Entry) {
r.removeMetadataCache(entry.Name)
r.unMarkNotFound(entry.Name)
}
func (r *BucketRegistry) GetBucketMetadata(bucketName string) (*BucketMetaData, s3err.ErrorCode) {
r.metadataCacheLock.RLock()
bucketMetadata, ok := r.metadataCache[bucketName]
r.metadataCacheLock.RUnlock()
if ok {
return bucketMetadata, s3err.ErrNone
}
r.notFoundLock.RLock()
_, ok = r.notFound[bucketName]
r.notFoundLock.RUnlock()
if ok {
return nil, s3err.ErrNoSuchBucket
}
bucketMetadata, errCode := r.LoadBucketMetadataFromFiler(bucketName)
if errCode != s3err.ErrNone {
return nil, errCode
}
r.setMetadataCache(bucketMetadata)
r.unMarkNotFound(bucketName)
return bucketMetadata, s3err.ErrNone
}
func (r *BucketRegistry) LoadBucketMetadataFromFiler(bucketName string) (*BucketMetaData, s3err.ErrorCode) {
r.notFoundLock.Lock()
defer r.notFoundLock.Unlock()
//check if already exists
r.metadataCacheLock.RLock()
bucketMetaData, ok := r.metadataCache[bucketName]
r.metadataCacheLock.RUnlock()
if ok {
return bucketMetaData, s3err.ErrNone
}
//if not exists, load from filer
bucketMetadata, err := loadBucketMetadataFromFiler(r, bucketName)
if err != nil {
if err == filer_pb.ErrNotFound {
// The bucket doesn't actually exist and should no longer loaded from the filer
r.notFound[bucketName] = struct{}{}
return nil, s3err.ErrNoSuchBucket
}
return nil, s3err.ErrInternalError
}
return bucketMetadata, s3err.ErrNone
}
func (r *BucketRegistry) setMetadataCache(metadata *BucketMetaData) {
r.metadataCacheLock.Lock()
defer r.metadataCacheLock.Unlock()
r.metadataCache[metadata.Name] = metadata
}
func (r *BucketRegistry) removeMetadataCache(bucket string) {
r.metadataCacheLock.Lock()
defer r.metadataCacheLock.Unlock()
delete(r.metadataCache, bucket)
}
func (r *BucketRegistry) markNotFound(bucket string) {
r.notFoundLock.Lock()
defer r.notFoundLock.Unlock()
r.notFound[bucket] = struct{}{}
}
func (r *BucketRegistry) unMarkNotFound(bucket string) {
r.notFoundLock.Lock()
defer r.notFoundLock.Unlock()
delete(r.notFound, bucket)
}