234 lines
6.1 KiB
Go
234 lines
6.1 KiB
Go
/*
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* Minio Cloud Storage, (C) 2016, 2017 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 cmd
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import (
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"sync"
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humanize "github.com/dustin/go-humanize"
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"github.com/minio/minio/pkg/errors"
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)
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const (
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// Block size used for all internal operations version 1.
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blockSizeV1 = 10 * humanize.MiByte
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// Staging buffer read size for all internal operations version 1.
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readSizeV1 = 1 * humanize.MiByte
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// Buckets meta prefix.
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bucketMetaPrefix = "buckets"
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// ETag (hex encoded md5sum) of empty string.
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emptyETag = "d41d8cd98f00b204e9800998ecf8427e"
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)
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// Global object layer mutex, used for safely updating object layer.
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var globalObjLayerMutex *sync.RWMutex
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// Global object layer, only accessed by newObjectLayerFn().
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var globalObjectAPI ObjectLayer
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func init() {
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// Initialize this once per server initialization.
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globalObjLayerMutex = &sync.RWMutex{}
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}
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// Check if the disk is remote.
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func isRemoteDisk(disk StorageAPI) bool {
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_, ok := disk.(*networkStorage)
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return ok
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}
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// Checks if the object is a directory, this logic uses
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// if size == 0 and object ends with slashSeparator then
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// returns true.
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func isObjectDir(object string, size int64) bool {
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return hasSuffix(object, slashSeparator) && size == 0
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}
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// Converts just bucket, object metadata into ObjectInfo datatype.
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func dirObjectInfo(bucket, object string, size int64, metadata map[string]string) ObjectInfo {
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// This is a special case with size as '0' and object ends with
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// a slash separator, we treat it like a valid operation and
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// return success.
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etag := metadata["etag"]
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delete(metadata, "etag")
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if etag == "" {
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etag = emptyETag
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}
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return ObjectInfo{
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Bucket: bucket,
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Name: object,
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ModTime: UTCNow(),
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ContentType: "application/octet-stream",
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IsDir: true,
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Size: size,
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ETag: etag,
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UserDefined: metadata,
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}
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}
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// House keeping code for FS/XL and distributed Minio setup.
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func houseKeeping(storageDisks []StorageAPI) error {
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var wg = &sync.WaitGroup{}
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// Initialize errs to collect errors inside go-routine.
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var errs = make([]error, len(storageDisks))
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// Initialize all disks in parallel.
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for index, disk := range storageDisks {
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if disk == nil {
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continue
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}
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// Skip remote disks.
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if isRemoteDisk(disk) {
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continue
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}
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wg.Add(1)
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go func(index int, disk StorageAPI) {
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// Indicate this wait group is done.
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defer wg.Done()
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// Cleanup all temp entries upon start.
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err := cleanupDir(disk, minioMetaTmpBucket, "")
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if err != nil {
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if !errors.IsErrIgnored(errors.Cause(err), errDiskNotFound, errVolumeNotFound, errFileNotFound) {
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errs[index] = err
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}
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}
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}(index, disk)
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}
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// Wait for all cleanup to finish.
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wg.Wait()
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// Return upon first error.
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for _, err := range errs {
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if err == nil {
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continue
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}
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return toObjectErr(err, minioMetaTmpBucket, "*")
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}
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// Return success here.
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return nil
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}
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// Depending on the disk type network or local, initialize storage API.
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func newStorageAPI(endpoint Endpoint) (storage StorageAPI, err error) {
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if endpoint.IsLocal {
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return newPosix(endpoint.Path)
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}
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return newStorageRPC(endpoint), nil
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}
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var initMetaVolIgnoredErrs = append(baseIgnoredErrs, errVolumeExists)
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// Initializes meta volume on all input storage disks.
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func initMetaVolume(storageDisks []StorageAPI) error {
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// This happens for the first time, but keep this here since this
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// is the only place where it can be made expensive optimizing all
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// other calls. Create minio meta volume, if it doesn't exist yet.
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var wg = &sync.WaitGroup{}
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// Initialize errs to collect errors inside go-routine.
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var errs = make([]error, len(storageDisks))
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// Initialize all disks in parallel.
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for index, disk := range storageDisks {
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if disk == nil {
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// Ignore create meta volume on disks which are not found.
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continue
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}
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wg.Add(1)
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go func(index int, disk StorageAPI) {
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// Indicate this wait group is done.
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defer wg.Done()
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// Attempt to create `.minio.sys`.
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err := disk.MakeVol(minioMetaBucket)
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if err != nil {
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if !errors.IsErrIgnored(err, initMetaVolIgnoredErrs...) {
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errs[index] = err
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return
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}
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}
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err = disk.MakeVol(minioMetaTmpBucket)
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if err != nil {
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if !errors.IsErrIgnored(err, initMetaVolIgnoredErrs...) {
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errs[index] = err
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return
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}
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}
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err = disk.MakeVol(minioMetaMultipartBucket)
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if err != nil {
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if !errors.IsErrIgnored(err, initMetaVolIgnoredErrs...) {
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errs[index] = err
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return
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}
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}
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}(index, disk)
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}
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// Wait for all cleanup to finish.
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wg.Wait()
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// Return upon first error.
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for _, err := range errs {
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if err == nil {
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continue
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}
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return toObjectErr(err, minioMetaBucket)
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}
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// Return success here.
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return nil
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}
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// Cleanup a directory recursively.
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func cleanupDir(storage StorageAPI, volume, dirPath string) error {
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var delFunc func(string) error
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// Function to delete entries recursively.
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delFunc = func(entryPath string) error {
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if !hasSuffix(entryPath, slashSeparator) {
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// Delete the file entry.
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return errors.Trace(storage.DeleteFile(volume, entryPath))
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}
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// If it's a directory, list and call delFunc() for each entry.
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entries, err := storage.ListDir(volume, entryPath)
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// If entryPath prefix never existed, safe to ignore.
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if err == errFileNotFound {
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return nil
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} else if err != nil { // For any other errors fail.
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return errors.Trace(err)
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} // else on success..
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// Recurse and delete all other entries.
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for _, entry := range entries {
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if err = delFunc(pathJoin(entryPath, entry)); err != nil {
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return err
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}
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}
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return nil
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}
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err := delFunc(retainSlash(pathJoin(dirPath)))
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return err
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}
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