* Add a generic registerShutdown function for graceful exit * Add shutdown callback test case
646 lines
18 KiB
Go
646 lines
18 KiB
Go
/*
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* Minio Cloud Storage, (C) 2016 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package main
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import (
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"crypto/md5"
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"encoding/hex"
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"encoding/json"
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"io"
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"os"
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"path"
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"path/filepath"
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"sort"
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"strings"
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"github.com/minio/minio/pkg/disk"
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"github.com/minio/minio/pkg/mimedb"
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)
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// fsObjects - Implements fs object layer.
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type fsObjects struct {
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storage StorageAPI
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physicalDisk string
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// List pool management.
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listPool *treeWalkPool
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}
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// creates format.json, the FS format info in minioMetaBucket.
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func initFormatFS(storageDisk StorageAPI) error {
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return writeFSFormatData(storageDisk, newFSFormatV1())
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}
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// loads format.json from minioMetaBucket if it exists.
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func loadFormatFS(storageDisk StorageAPI) (format formatConfigV1, err error) {
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// Reads entire `format.json`.
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buf, err := storageDisk.ReadAll(minioMetaBucket, fsFormatJSONFile)
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if err != nil {
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return formatConfigV1{}, err
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}
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// Unmarshal format config.
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if err = json.Unmarshal(buf, &format); err != nil {
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return formatConfigV1{}, err
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}
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// Return structured `format.json`.
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return format, nil
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}
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// Should be called when process shuts down.
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func shutdownFS(storage StorageAPI) errCode {
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// List if there are any multipart entries.
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_, err := storage.ListDir(minioMetaBucket, mpartMetaPrefix)
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if err != errFileNotFound {
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// Multipart directory is not empty hence do not remove '.minio.sys' volume.
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return exitSuccess
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}
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// List if there are any bucket configuration entries.
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_, err = storage.ListDir(minioMetaBucket, bucketConfigPrefix)
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if err != errFileNotFound {
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// Bucket config directory is not empty hence do not remove '.minio.sys' volume.
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return exitSuccess
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}
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// Cleanup everything else.
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prefix := ""
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if err = cleanupDir(storage, minioMetaBucket, prefix); err != nil {
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errorIf(err, "Unable to cleanup minio meta bucket")
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return exitFailure
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}
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if err = storage.DeleteVol(minioMetaBucket); err != nil {
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if err != errVolumeNotEmpty {
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errorIf(err, "Unable to delete minio meta bucket %s", minioMetaBucket)
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return exitFailure
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}
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}
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// Successful exit.
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return exitSuccess
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}
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// newFSObjects - initialize new fs object layer.
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func newFSObjects(disk string) (ObjectLayer, error) {
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storage, err := newStorageAPI(disk)
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if err != nil && err != errDiskNotFound {
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return nil, err
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}
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// Attempt to create `.minio`.
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err = storage.MakeVol(minioMetaBucket)
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if err != nil {
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switch err {
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// Ignore the errors.
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case errVolumeExists, errDiskNotFound, errFaultyDisk:
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default:
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return nil, toObjectErr(err, minioMetaBucket)
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}
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}
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// Runs house keeping code, like creating minioMetaBucket, cleaning up tmp files etc.
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if err = fsHouseKeeping(storage); err != nil {
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return nil, err
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}
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// loading format.json from minioMetaBucket.
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// Note: The format.json content is ignored, reserved for future use.
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format, err := loadFormatFS(storage)
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if err != nil {
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if err == errFileNotFound {
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// format.json doesn't exist, create it inside minioMetaBucket.
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err = initFormatFS(storage)
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if err != nil {
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return nil, err
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}
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} else {
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return nil, err
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}
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} else if !isFSFormat(format) {
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return nil, errFSDiskFormat
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}
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// Register the callback that should be called when the process shuts down.
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registerObjectStorageShutdown(func() errCode {
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return shutdownFS(storage)
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})
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// Initialize fs objects.
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fs := fsObjects{
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storage: storage,
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physicalDisk: disk,
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listPool: newTreeWalkPool(globalLookupTimeout),
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}
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// Return successfully initialized object layer.
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return fs, nil
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}
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// StorageInfo - returns underlying storage statistics.
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func (fs fsObjects) StorageInfo() StorageInfo {
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info, err := disk.GetInfo(fs.physicalDisk)
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fatalIf(err, "Unable to get disk info "+fs.physicalDisk)
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return StorageInfo{
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Total: info.Total,
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Free: info.Free,
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}
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}
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/// Bucket operations
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// MakeBucket - make a bucket.
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func (fs fsObjects) MakeBucket(bucket string) error {
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// Verify if bucket is valid.
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if !IsValidBucketName(bucket) {
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return BucketNameInvalid{Bucket: bucket}
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}
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if err := fs.storage.MakeVol(bucket); err != nil {
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return toObjectErr(err, bucket)
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}
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return nil
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}
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// GetBucketInfo - get bucket info.
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func (fs fsObjects) GetBucketInfo(bucket string) (BucketInfo, error) {
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// Verify if bucket is valid.
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if !IsValidBucketName(bucket) {
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return BucketInfo{}, BucketNameInvalid{Bucket: bucket}
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}
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vi, err := fs.storage.StatVol(bucket)
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if err != nil {
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return BucketInfo{}, toObjectErr(err, bucket)
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}
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return BucketInfo{
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Name: bucket,
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Created: vi.Created,
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}, nil
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}
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// ListBuckets - list buckets.
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func (fs fsObjects) ListBuckets() ([]BucketInfo, error) {
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var bucketInfos []BucketInfo
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vols, err := fs.storage.ListVols()
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if err != nil {
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return nil, toObjectErr(err)
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}
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for _, vol := range vols {
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// StorageAPI can send volume names which are incompatible
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// with buckets, handle it and skip them.
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if !IsValidBucketName(vol.Name) {
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continue
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}
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// Ignore the volume special bucket.
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if vol.Name == minioMetaBucket {
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continue
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}
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bucketInfos = append(bucketInfos, BucketInfo{
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Name: vol.Name,
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Created: vol.Created,
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})
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}
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sort.Sort(byBucketName(bucketInfos))
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return bucketInfos, nil
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}
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// DeleteBucket - delete a bucket.
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func (fs fsObjects) DeleteBucket(bucket string) error {
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// Verify if bucket is valid.
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if !IsValidBucketName(bucket) {
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return BucketNameInvalid{Bucket: bucket}
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}
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// Attempt to delete regular bucket.
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if err := fs.storage.DeleteVol(bucket); err != nil {
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return toObjectErr(err, bucket)
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}
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// Cleanup all the previously incomplete multiparts.
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if err := cleanupDir(fs.storage, path.Join(minioMetaBucket, mpartMetaPrefix), bucket); err != nil && err != errVolumeNotFound {
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return toObjectErr(err, bucket)
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}
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return nil
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}
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/// Object Operations
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// GetObject - get an object.
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func (fs fsObjects) GetObject(bucket, object string, offset int64, length int64, writer io.Writer) (err error) {
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// Verify if bucket is valid.
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if !IsValidBucketName(bucket) {
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return BucketNameInvalid{Bucket: bucket}
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}
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// Verify if object is valid.
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if !IsValidObjectName(object) {
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return ObjectNameInvalid{Bucket: bucket, Object: object}
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}
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// Offset and length cannot be negative.
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if offset < 0 || length < 0 {
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return toObjectErr(errUnexpected, bucket, object)
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}
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// Writer cannot be nil.
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if writer == nil {
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return toObjectErr(errUnexpected, bucket, object)
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}
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// Stat the file to get file size.
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fi, err := fs.storage.StatFile(bucket, object)
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if err != nil {
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return toObjectErr(err, bucket, object)
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}
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// Reply back invalid range if the input offset and length fall out of range.
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if offset > fi.Size || length > fi.Size {
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return InvalidRange{offset, length, fi.Size}
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}
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// Reply if we have inputs with offset and length falling out of file size range.
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if offset+length > fi.Size {
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return InvalidRange{offset, length, fi.Size}
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}
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var totalLeft = length
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bufSize := int64(readSizeV1)
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if length > 0 && bufSize > length {
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bufSize = length
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}
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// Allocate a staging buffer.
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buf := make([]byte, int(bufSize))
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for {
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// Figure out the right size for the buffer.
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curLeft := bufSize
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if totalLeft < bufSize {
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curLeft = totalLeft
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}
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// Reads the file at offset.
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nr, er := fs.storage.ReadFile(bucket, object, offset, buf[:curLeft])
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if nr > 0 {
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// Write to response writer.
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nw, ew := writer.Write(buf[0:nr])
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if nw > 0 {
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// Decrement whats left to write.
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totalLeft -= int64(nw)
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// Progress the offset
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offset += int64(nw)
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}
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if ew != nil {
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err = ew
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break
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}
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if nr != int64(nw) {
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err = io.ErrShortWrite
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break
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}
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}
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if er == io.EOF || er == io.ErrUnexpectedEOF {
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break
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}
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if er != nil {
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err = er
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break
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}
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if totalLeft == 0 {
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break
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}
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}
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// Returns any error.
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return toObjectErr(err, bucket, object)
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}
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// GetObjectInfo - get object info.
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func (fs fsObjects) GetObjectInfo(bucket, object string) (ObjectInfo, error) {
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// Verify if bucket is valid.
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if !IsValidBucketName(bucket) {
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return ObjectInfo{}, (BucketNameInvalid{Bucket: bucket})
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}
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// Verify if object is valid.
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if !IsValidObjectName(object) {
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return ObjectInfo{}, (ObjectNameInvalid{Bucket: bucket, Object: object})
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}
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fi, err := fs.storage.StatFile(bucket, object)
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if err != nil {
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return ObjectInfo{}, toObjectErr(err, bucket, object)
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}
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fsMeta, err := readFSMetadata(fs.storage, minioMetaBucket, path.Join(bucketMetaPrefix, bucket, object))
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if err != nil && err != errFileNotFound {
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return ObjectInfo{}, toObjectErr(err, bucket, object)
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}
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if len(fsMeta.Meta) == 0 {
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fsMeta.Meta = make(map[string]string)
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}
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// Guess content-type from the extension if possible.
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if fsMeta.Meta["content-type"] == "" {
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if objectExt := filepath.Ext(object); objectExt != "" {
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if content, ok := mimedb.DB[strings.ToLower(strings.TrimPrefix(objectExt, "."))]; ok {
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fsMeta.Meta["content-type"] = content.ContentType
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}
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}
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}
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// Guess content-type from the extension if possible.
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return ObjectInfo{
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Bucket: bucket,
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Name: object,
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ModTime: fi.ModTime,
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Size: fi.Size,
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IsDir: fi.Mode.IsDir(),
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MD5Sum: fsMeta.Meta["md5Sum"],
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ContentType: fsMeta.Meta["content-type"],
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ContentEncoding: fsMeta.Meta["content-encoding"],
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UserDefined: fsMeta.Meta,
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}, nil
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}
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// PutObject - create an object.
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func (fs fsObjects) PutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string) (string, error) {
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// Verify if bucket is valid.
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if !IsValidBucketName(bucket) {
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return "", BucketNameInvalid{Bucket: bucket}
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}
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if !IsValidObjectName(object) {
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return "", ObjectNameInvalid{
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Bucket: bucket,
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Object: object,
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}
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}
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uniqueID := getUUID()
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// Uploaded object will first be written to the temporary location which will eventually
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// be renamed to the actual location. It is first written to the temporary location
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// so that cleaning it up will be easy if the server goes down.
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tempObj := path.Join(tmpMetaPrefix, uniqueID)
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// Initialize md5 writer.
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md5Writer := md5.New()
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// Limit the reader to its provided size if specified.
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var limitDataReader io.Reader
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if size > 0 {
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// This is done so that we can avoid erroneous clients sending more data than the set content size.
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limitDataReader = io.LimitReader(data, size)
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} else {
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// else we read till EOF.
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limitDataReader = data
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}
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if size == 0 {
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// For size 0 we write a 0byte file.
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err := fs.storage.AppendFile(minioMetaBucket, tempObj, []byte(""))
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if err != nil {
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return "", toObjectErr(err, bucket, object)
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}
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} else {
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// Allocate a buffer to Read() from request body
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bufSize := int64(readSizeV1)
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if size > 0 && bufSize > size {
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bufSize = size
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}
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buf := make([]byte, int(bufSize))
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teeReader := io.TeeReader(limitDataReader, md5Writer)
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bytesWritten, err := fsCreateFile(fs.storage, teeReader, buf, minioMetaBucket, tempObj)
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if err != nil {
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fs.storage.DeleteFile(minioMetaBucket, tempObj)
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return "", toObjectErr(err, bucket, object)
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}
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// Should return IncompleteBody{} error when reader has fewer
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// bytes than specified in request header.
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if bytesWritten < size {
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fs.storage.DeleteFile(minioMetaBucket, tempObj)
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return "", IncompleteBody{}
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}
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}
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newMD5Hex := hex.EncodeToString(md5Writer.Sum(nil))
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// md5Hex representation.
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var md5Hex string
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if len(metadata) != 0 {
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md5Hex = metadata["md5Sum"]
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}
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// Validate if payload is valid.
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if isSignVerify(data) {
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if vErr := data.(*signVerifyReader).Verify(); vErr != nil {
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// Incoming payload wrong, delete the temporary object.
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fs.storage.DeleteFile(minioMetaBucket, tempObj)
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// Error return.
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return "", toObjectErr(vErr, bucket, object)
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}
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}
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if md5Hex != "" {
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if newMD5Hex != md5Hex {
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// MD5 mismatch, delete the temporary object.
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fs.storage.DeleteFile(minioMetaBucket, tempObj)
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// Returns md5 mismatch.
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return "", BadDigest{md5Hex, newMD5Hex}
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}
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}
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// Entire object was written to the temp location, now it's safe to rename it to the actual location.
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err := fs.storage.RenameFile(minioMetaBucket, tempObj, bucket, object)
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if err != nil {
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return "", toObjectErr(err, bucket, object)
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}
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// Save additional metadata only if extended headers such as "X-Amz-Meta-" are set.
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if hasExtendedHeader(metadata) {
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// Initialize `fs.json` values.
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fsMeta := newFSMetaV1()
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fsMeta.Meta = metadata
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fsMetaPath := path.Join(bucketMetaPrefix, bucket, object, fsMetaJSONFile)
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if err = writeFSMetadata(fs.storage, minioMetaBucket, fsMetaPath, fsMeta); err != nil {
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return "", toObjectErr(err, bucket, object)
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}
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}
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// Return md5sum, successfully wrote object.
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return newMD5Hex, nil
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}
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// DeleteObject - deletes an object from a bucket, this operation is destructive
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// and there are no rollbacks supported.
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func (fs fsObjects) DeleteObject(bucket, object string) error {
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// Verify if bucket is valid.
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if !IsValidBucketName(bucket) {
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return BucketNameInvalid{Bucket: bucket}
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}
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if !IsValidObjectName(object) {
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return ObjectNameInvalid{Bucket: bucket, Object: object}
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}
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err := fs.storage.DeleteFile(minioMetaBucket, path.Join(bucketMetaPrefix, bucket, object))
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if err != nil && err != errFileNotFound {
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return toObjectErr(err, bucket, object)
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}
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if err = fs.storage.DeleteFile(bucket, object); err != nil {
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return toObjectErr(err, bucket, object)
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}
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return nil
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}
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// Checks whether bucket exists.
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func isBucketExist(storage StorageAPI, bucketName string) bool {
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// Check whether bucket exists.
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_, err := storage.StatVol(bucketName)
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if err != nil {
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if err == errVolumeNotFound {
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return false
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}
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errorIf(err, "Stat failed on bucket "+bucketName+".")
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return false
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}
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return true
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}
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func (fs fsObjects) listObjects(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
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// Convert entry to FileInfo
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entryToFileInfo := func(entry string) (fileInfo FileInfo, err error) {
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if strings.HasSuffix(entry, slashSeparator) {
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// Object name needs to be full path.
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fileInfo.Name = entry
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fileInfo.Mode = os.ModeDir
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return
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}
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if fileInfo, err = fs.storage.StatFile(bucket, entry); err != nil {
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return
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}
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// Object name needs to be full path.
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fileInfo.Name = entry
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return
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}
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// Verify if bucket is valid.
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if !IsValidBucketName(bucket) {
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return ListObjectsInfo{}, BucketNameInvalid{Bucket: bucket}
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}
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// Verify if bucket exists.
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if !isBucketExist(fs.storage, bucket) {
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return ListObjectsInfo{}, BucketNotFound{Bucket: bucket}
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}
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if !IsValidObjectPrefix(prefix) {
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return ListObjectsInfo{}, ObjectNameInvalid{Bucket: bucket, Object: prefix}
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}
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// Verify if delimiter is anything other than '/', which we do not support.
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if delimiter != "" && delimiter != slashSeparator {
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return ListObjectsInfo{}, UnsupportedDelimiter{
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Delimiter: delimiter,
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}
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|
}
|
|
// Verify if marker has prefix.
|
|
if marker != "" {
|
|
if !strings.HasPrefix(marker, prefix) {
|
|
return ListObjectsInfo{}, InvalidMarkerPrefixCombination{
|
|
Marker: marker,
|
|
Prefix: prefix,
|
|
}
|
|
}
|
|
}
|
|
|
|
// With max keys of zero we have reached eof, return right here.
|
|
if maxKeys == 0 {
|
|
return ListObjectsInfo{}, nil
|
|
}
|
|
|
|
// For delimiter and prefix as '/' we do not list anything at all
|
|
// since according to s3 spec we stop at the 'delimiter'
|
|
// along // with the prefix. On a flat namespace with 'prefix'
|
|
// as '/' we don't have any entries, since all the keys are
|
|
// of form 'keyName/...'
|
|
if delimiter == slashSeparator && prefix == slashSeparator {
|
|
return ListObjectsInfo{}, nil
|
|
}
|
|
|
|
// Over flowing count - reset to maxObjectList.
|
|
if maxKeys < 0 || maxKeys > maxObjectList {
|
|
maxKeys = maxObjectList
|
|
}
|
|
|
|
// Default is recursive, if delimiter is set then list non recursive.
|
|
recursive := true
|
|
if delimiter == slashSeparator {
|
|
recursive = false
|
|
}
|
|
|
|
walkResultCh, endWalkCh := fs.listPool.Release(listParams{bucket, recursive, marker, prefix})
|
|
if walkResultCh == nil {
|
|
endWalkCh = make(chan struct{})
|
|
isLeaf := func(bucket, object string) bool {
|
|
// bucket argument is unused as we don't need to StatFile
|
|
// to figure if it's a file, just need to check that the
|
|
// object string does not end with "/".
|
|
return !strings.HasSuffix(object, slashSeparator)
|
|
}
|
|
listDir := listDirFactory(isLeaf, fs.storage)
|
|
walkResultCh = startTreeWalk(bucket, prefix, marker, recursive, listDir, isLeaf, endWalkCh)
|
|
}
|
|
var fileInfos []FileInfo
|
|
var eof bool
|
|
var nextMarker string
|
|
for i := 0; i < maxKeys; {
|
|
walkResult, ok := <-walkResultCh
|
|
if !ok {
|
|
// Closed channel.
|
|
eof = true
|
|
break
|
|
}
|
|
// For any walk error return right away.
|
|
if walkResult.err != nil {
|
|
// File not found is a valid case.
|
|
if walkResult.err == errFileNotFound {
|
|
return ListObjectsInfo{}, nil
|
|
}
|
|
return ListObjectsInfo{}, toObjectErr(walkResult.err, bucket, prefix)
|
|
}
|
|
fileInfo, err := entryToFileInfo(walkResult.entry)
|
|
if err != nil {
|
|
return ListObjectsInfo{}, nil
|
|
}
|
|
nextMarker = fileInfo.Name
|
|
fileInfos = append(fileInfos, fileInfo)
|
|
if walkResult.end {
|
|
eof = true
|
|
break
|
|
}
|
|
i++
|
|
}
|
|
params := listParams{bucket, recursive, nextMarker, prefix}
|
|
if !eof {
|
|
fs.listPool.Set(params, walkResultCh, endWalkCh)
|
|
}
|
|
|
|
result := ListObjectsInfo{IsTruncated: !eof}
|
|
for _, fileInfo := range fileInfos {
|
|
result.NextMarker = fileInfo.Name
|
|
if fileInfo.Mode.IsDir() {
|
|
result.Prefixes = append(result.Prefixes, fileInfo.Name)
|
|
continue
|
|
}
|
|
result.Objects = append(result.Objects, ObjectInfo{
|
|
Name: fileInfo.Name,
|
|
ModTime: fileInfo.ModTime,
|
|
Size: fileInfo.Size,
|
|
MD5Sum: fileInfo.MD5Sum,
|
|
IsDir: false,
|
|
})
|
|
}
|
|
return result, nil
|
|
}
|
|
|
|
// ListObjects - list all objects.
|
|
func (fs fsObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
|
|
return fs.listObjects(bucket, prefix, marker, delimiter, maxKeys)
|
|
}
|