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minio/pkg/fs/fs-bucket.go

276 lines
7.4 KiB

/*
* Minio Cloud Storage, (C) 2015 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 fs
import (
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/minio/minio/pkg/disk"
"github.com/minio/minio/pkg/probe"
)
/// Bucket Operations
// DeleteBucket - delete a bucket.
func (fs Filesystem) DeleteBucket(bucket string) *probe.Error {
// Verify bucket is valid.
if !IsValidBucketName(bucket) {
return probe.NewError(BucketNameInvalid{Bucket: bucket})
}
bucket = fs.denormalizeBucket(bucket)
bucketDir := filepath.Join(fs.path, bucket)
// Check if bucket exists.
if _, e := os.Stat(bucketDir); e != nil {
if os.IsNotExist(e) {
return probe.NewError(BucketNotFound{Bucket: bucket})
}
return probe.NewError(e)
}
if e := os.Remove(bucketDir); e != nil {
// On windows the string is slightly different, handle it here.
if strings.Contains(e.Error(), "directory is not empty") {
return probe.NewError(BucketNotEmpty{Bucket: bucket})
}
// Hopefully for all other operating systems, this is
// assumed to be consistent.
if strings.Contains(e.Error(), "directory not empty") {
return probe.NewError(BucketNotEmpty{Bucket: bucket})
}
return probe.NewError(e)
}
// Critical region hold write lock.
fs.rwLock.Lock()
delete(fs.buckets.Metadata, bucket)
if err := saveBucketsMetadata(*fs.buckets); err != nil {
fs.rwLock.Unlock()
return err.Trace(bucket)
}
fs.rwLock.Unlock()
return nil
}
// ListBuckets - Get service.
func (fs Filesystem) ListBuckets() ([]BucketMetadata, *probe.Error) {
files, e := ioutil.ReadDir(fs.path)
if e != nil {
return []BucketMetadata{}, probe.NewError(e)
}
var metadataList []BucketMetadata
for _, file := range files {
if !file.IsDir() {
// If not directory, ignore all file types.
continue
}
// If directories are found with odd names, skip them.
dirName := strings.ToLower(file.Name())
if file.IsDir() && !IsValidBucketName(dirName) {
continue
}
metadata := BucketMetadata{
Name: dirName,
Created: file.ModTime(),
}
metadataList = append(metadataList, metadata)
}
// Remove duplicated entries.
metadataList = removeDuplicateBuckets(metadataList)
return metadataList, nil
}
// removeDuplicateBuckets - remove duplicate buckets.
func removeDuplicateBuckets(buckets []BucketMetadata) []BucketMetadata {
length := len(buckets) - 1
for i := 0; i < length; i++ {
for j := i + 1; j <= length; j++ {
if buckets[i].Name == buckets[j].Name {
if buckets[i].Created.Sub(buckets[j].Created) > 0 {
buckets[i] = buckets[length]
} else {
buckets[j] = buckets[length]
}
buckets = buckets[0:length]
length--
j--
}
}
}
return buckets
}
// MakeBucket - PUT Bucket.
func (fs Filesystem) MakeBucket(bucket, acl string) *probe.Error {
di, err := disk.GetInfo(fs.path)
if err != nil {
return probe.NewError(err)
}
// Remove 5% from total space for cumulative disk space used for
// journalling, inodes etc.
availableDiskSpace := (float64(di.Free) / (float64(di.Total) - (0.05 * float64(di.Total)))) * 100
if int64(availableDiskSpace) <= fs.minFreeDisk {
return probe.NewError(RootPathFull{Path: fs.path})
}
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return probe.NewError(BucketNameInvalid{Bucket: bucket})
}
// Verify if bucket acl is valid.
if !IsValidBucketACL(acl) {
return probe.NewError(InvalidACL{ACL: acl})
}
// Get bucket path.
bucket = fs.denormalizeBucket(bucket)
bucketDir := filepath.Join(fs.path, bucket)
if _, e := os.Stat(bucketDir); e == nil {
return probe.NewError(BucketExists{Bucket: bucket})
}
// Make bucket.
if e := os.Mkdir(bucketDir, 0700); e != nil {
return probe.NewError(err)
}
fi, e := os.Stat(bucketDir)
// Check if bucket exists.
if e != nil {
if os.IsNotExist(e) {
return probe.NewError(BucketNotFound{Bucket: bucket})
}
return probe.NewError(e)
}
if acl == "" {
acl = "private"
}
// Get a new bucket name metadata.
bucketMetadata := &BucketMetadata{}
bucketMetadata.Name = fi.Name()
bucketMetadata.Created = fi.ModTime()
bucketMetadata.ACL = BucketACL(acl)
// Critical region hold a write lock.
fs.rwLock.Lock()
fs.buckets.Metadata[bucket] = bucketMetadata
if err := saveBucketsMetadata(*fs.buckets); err != nil {
fs.rwLock.Unlock()
return err.Trace(bucket)
}
fs.rwLock.Unlock()
return nil
}
// denormalizeBucket - will convert incoming bucket names to
// corresponding valid bucketnames on the backend in a platform
// compatible way for all operating systems.
func (fs Filesystem) denormalizeBucket(bucket string) string {
buckets, e := ioutil.ReadDir(fs.path)
if e != nil {
return bucket
}
for _, b := range buckets {
// Verify if lowercase version of the bucket is equal to the
// incoming bucket, then use the proper name.
if strings.ToLower(b.Name()) == bucket {
return b.Name()
}
}
return bucket
}
// GetBucketMetadata - get bucket metadata.
func (fs Filesystem) GetBucketMetadata(bucket string) (BucketMetadata, *probe.Error) {
if !IsValidBucketName(bucket) {
return BucketMetadata{}, probe.NewError(BucketNameInvalid{Bucket: bucket})
}
bucket = fs.denormalizeBucket(bucket)
// Get bucket path.
bucketDir := filepath.Join(fs.path, bucket)
fi, e := os.Stat(bucketDir)
if e != nil {
// Check if bucket exists.
if os.IsNotExist(e) {
return BucketMetadata{}, probe.NewError(BucketNotFound{Bucket: bucket})
}
return BucketMetadata{}, probe.NewError(e)
}
fs.rwLock.RLock()
bucketMetadata, ok := fs.buckets.Metadata[bucket]
fs.rwLock.RUnlock()
// If metadata value is not found, get it from disk.
if !ok {
bucketMetadata = &BucketMetadata{}
bucketMetadata.Name = fi.Name()
bucketMetadata.Created = fi.ModTime()
bucketMetadata.ACL = BucketACL("private")
}
return *bucketMetadata, nil
}
// SetBucketMetadata - set bucket metadata.
func (fs Filesystem) SetBucketMetadata(bucket string, metadata map[string]string) *probe.Error {
// Input validation.
if !IsValidBucketName(bucket) {
return probe.NewError(BucketNameInvalid{Bucket: bucket})
}
// Save the acl.
acl := metadata["acl"]
if !IsValidBucketACL(acl) {
return probe.NewError(InvalidACL{ACL: acl})
}
if acl == "" {
acl = "private"
}
bucket = fs.denormalizeBucket(bucket)
bucketDir := filepath.Join(fs.path, bucket)
fi, e := os.Stat(bucketDir)
if e != nil {
// Check if bucket exists.
if os.IsNotExist(e) {
return probe.NewError(BucketNotFound{Bucket: bucket})
}
return probe.NewError(e)
}
// Critical region handle read lock.
fs.rwLock.RLock()
bucketMetadata, ok := fs.buckets.Metadata[bucket]
fs.rwLock.RUnlock()
if !ok {
bucketMetadata = &BucketMetadata{}
bucketMetadata.Name = fi.Name()
bucketMetadata.Created = fi.ModTime()
}
bucketMetadata.ACL = BucketACL(acl)
// Critical region handle write lock.
fs.rwLock.Lock()
fs.buckets.Metadata[bucket] = bucketMetadata
if err := saveBucketsMetadata(*fs.buckets); err != nil {
fs.rwLock.Unlock()
return err.Trace(bucket)
}
fs.rwLock.Unlock()
return nil
}