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386 lines
11 KiB
386 lines
11 KiB
/*
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* Minio Cloud Storage, (C) 2015 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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"bytes"
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"crypto/md5"
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"io"
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"os"
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"path/filepath"
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"strings"
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"encoding/hex"
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"runtime"
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"github.com/minio/minio/pkg/disk"
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"github.com/minio/minio/pkg/mimedb"
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"github.com/minio/minio/pkg/probe"
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"github.com/minio/minio/pkg/safe"
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)
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// isDirEmpty - returns whether given directory is empty or not.
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func isDirEmpty(dirname string) (status bool, err error) {
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f, err := os.Open(dirname)
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if err == nil {
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defer f.Close()
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if _, err = f.Readdirnames(1); err == io.EOF {
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status = true
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err = nil
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}
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}
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return
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}
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/// Object Operations
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// GetObject - GET object
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func (fs Filesystem) GetObject(bucket, object string, startOffset int64) (io.ReadCloser, *probe.Error) {
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// Input validation.
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if !IsValidBucketName(bucket) {
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return nil, probe.NewError(BucketNameInvalid{Bucket: bucket})
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}
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if !IsValidObjectName(object) {
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return nil, probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: object})
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}
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// normalize buckets.
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bucket = getActualBucketname(fs.path, bucket)
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objectPath := filepath.Join(fs.path, bucket, object)
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file, e := os.Open(objectPath)
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if e != nil {
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// If the object doesn't exist, the bucket might not exist either. Stat for
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// the bucket and give a better error message if that is true.
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if os.IsNotExist(e) {
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_, e = os.Stat(filepath.Join(fs.path, bucket))
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if os.IsNotExist(e) {
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return nil, probe.NewError(BucketNotFound{Bucket: bucket})
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}
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return nil, probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
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}
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return nil, probe.NewError(e)
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}
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// Initiate a cached stat operation on the file handler.
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st, e := file.Stat()
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if e != nil {
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return nil, probe.NewError(e)
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}
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// Object path is a directory prefix, return object not found error.
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if st.IsDir() {
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return nil, probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
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}
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// Seek to a starting offset.
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_, e = file.Seek(startOffset, os.SEEK_SET)
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if e != nil {
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// When the "handle is invalid", the file might be a directory on Windows.
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if runtime.GOOS == "windows" && strings.Contains(e.Error(), "handle is invalid") {
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return nil, probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
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}
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return nil, probe.NewError(e)
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}
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return file, nil
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}
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// GetObjectInfo - get object info.
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func (fs Filesystem) GetObjectInfo(bucket, object string) (ObjectInfo, *probe.Error) {
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// Input validation.
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if !IsValidBucketName(bucket) {
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return ObjectInfo{}, probe.NewError(BucketNameInvalid{Bucket: bucket})
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}
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if !IsValidObjectName(object) {
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return ObjectInfo{}, probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: object})
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}
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// Normalize buckets.
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bucket = getActualBucketname(fs.path, bucket)
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bucketPath := filepath.Join(fs.path, bucket)
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if _, e := os.Stat(bucketPath); e != nil {
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if os.IsNotExist(e) {
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return ObjectInfo{}, probe.NewError(BucketNotFound{Bucket: bucket})
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}
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return ObjectInfo{}, probe.NewError(e)
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}
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info, err := getObjectInfo(fs.path, bucket, object)
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if err != nil {
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if os.IsNotExist(err.ToGoError()) {
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return ObjectInfo{}, probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
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}
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return ObjectInfo{}, err.Trace(bucket, object)
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}
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if info.IsDir {
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return ObjectInfo{}, probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
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}
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return info, nil
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}
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// getObjectInfo - get object stat info.
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func getObjectInfo(rootPath, bucket, object string) (ObjectInfo, *probe.Error) {
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// Do not use filepath.Join() since filepath.Join strips off any
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// object names with '/', use them as is in a static manner so
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// that we can send a proper 'ObjectNotFound' reply back upon os.Stat().
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var objectPath string
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// For windows use its special os.PathSeparator == "\\"
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if runtime.GOOS == "windows" {
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objectPath = rootPath + string(os.PathSeparator) + bucket + string(os.PathSeparator) + object
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} else {
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objectPath = rootPath + string(os.PathSeparator) + bucket + string(os.PathSeparator) + object
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}
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stat, e := os.Stat(objectPath)
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if e != nil {
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return ObjectInfo{}, probe.NewError(e)
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}
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contentType := "application/octet-stream"
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if runtime.GOOS == "windows" {
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object = filepath.ToSlash(object)
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}
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if objectExt := filepath.Ext(object); objectExt != "" {
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content, ok := mimedb.DB[strings.ToLower(strings.TrimPrefix(objectExt, "."))]
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if ok {
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contentType = content.ContentType
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}
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}
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metadata := ObjectInfo{
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Bucket: bucket,
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Name: object,
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ModifiedTime: stat.ModTime(),
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Size: stat.Size(),
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ContentType: contentType,
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IsDir: stat.Mode().IsDir(),
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}
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return metadata, nil
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}
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// isMD5SumEqual - returns error if md5sum mismatches, success its `nil`
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func isMD5SumEqual(expectedMD5Sum, actualMD5Sum string) bool {
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// Verify the md5sum.
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if expectedMD5Sum != "" && actualMD5Sum != "" {
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// Decode md5sum to bytes from their hexadecimal
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// representations.
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expectedMD5SumBytes, err := hex.DecodeString(expectedMD5Sum)
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if err != nil {
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return false
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}
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actualMD5SumBytes, err := hex.DecodeString(actualMD5Sum)
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if err != nil {
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return false
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}
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// Verify md5sum bytes are equal after successful decoding.
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if !bytes.Equal(expectedMD5SumBytes, actualMD5SumBytes) {
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return false
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}
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return true
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}
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return false
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}
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// PutObject - create an object.
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func (fs Filesystem) PutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string) (ObjectInfo, *probe.Error) {
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di, e := disk.GetInfo(fs.path)
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if e != nil {
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return ObjectInfo{}, probe.NewError(e)
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}
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// Remove 5% from total space for cumulative disk space used for
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// journalling, inodes etc.
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availableDiskSpace := (float64(di.Free) / (float64(di.Total) - (0.05 * float64(di.Total)))) * 100
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if int64(availableDiskSpace) <= fs.minFreeDisk {
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return ObjectInfo{}, probe.NewError(RootPathFull{Path: fs.path})
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}
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// Check bucket name valid.
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if !IsValidBucketName(bucket) {
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return ObjectInfo{}, probe.NewError(BucketNameInvalid{Bucket: bucket})
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}
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bucket = getActualBucketname(fs.path, bucket)
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bucketPath := filepath.Join(fs.path, bucket)
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if _, e = os.Stat(bucketPath); e != nil {
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if os.IsNotExist(e) {
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return ObjectInfo{}, probe.NewError(BucketNotFound{Bucket: bucket})
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}
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return ObjectInfo{}, probe.NewError(e)
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}
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// Verify object path legal.
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if !IsValidObjectName(object) {
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return ObjectInfo{}, probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: object})
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}
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// Get object path.
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objectPath := filepath.Join(bucketPath, object)
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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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// Write object.
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safeFile, e := safe.CreateFileWithPrefix(objectPath, md5Hex+"$tmpobject")
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if e != nil {
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switch e := e.(type) {
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case *os.PathError:
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if e.Op == "mkdir" {
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if strings.Contains(e.Error(), "not a directory") {
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return ObjectInfo{}, probe.NewError(ObjectExistsAsPrefix{Bucket: bucket, Prefix: object})
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}
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}
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return ObjectInfo{}, probe.NewError(e)
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default:
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return ObjectInfo{}, probe.NewError(e)
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}
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}
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// Initialize md5 writer.
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md5Writer := md5.New()
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// Instantiate a new multi writer.
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multiWriter := io.MultiWriter(md5Writer, safeFile)
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// Instantiate checksum hashers and create a multiwriter.
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if size > 0 {
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if _, e = io.CopyN(multiWriter, data, size); e != nil {
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safeFile.CloseAndRemove()
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return ObjectInfo{}, probe.NewError(e)
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}
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} else {
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if _, e = io.Copy(multiWriter, data); e != nil {
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safeFile.CloseAndRemove()
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return ObjectInfo{}, probe.NewError(e)
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}
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}
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newMD5Hex := hex.EncodeToString(md5Writer.Sum(nil))
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if md5Hex != "" {
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if newMD5Hex != md5Hex {
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return ObjectInfo{}, probe.NewError(BadDigest{md5Hex, newMD5Hex})
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}
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}
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// Set stat again to get the latest metadata.
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st, e := os.Stat(safeFile.Name())
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if e != nil {
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return ObjectInfo{}, probe.NewError(e)
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}
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contentType := "application/octet-stream"
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if objectExt := filepath.Ext(objectPath); objectExt != "" {
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content, ok := mimedb.DB[strings.ToLower(strings.TrimPrefix(objectExt, "."))]
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if ok {
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contentType = content.ContentType
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}
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}
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newObject := ObjectInfo{
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Bucket: bucket,
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Name: object,
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ModifiedTime: st.ModTime(),
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Size: st.Size(),
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MD5Sum: newMD5Hex,
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ContentType: contentType,
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}
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// Safely close and atomically rename the file.
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safeFile.Close()
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return newObject, nil
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}
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// deleteObjectPath - delete object path if its empty.
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func deleteObjectPath(basePath, deletePath, bucket, object string) *probe.Error {
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if basePath == deletePath {
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return nil
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}
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// Verify if the path exists.
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pathSt, e := os.Stat(deletePath)
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if e != nil {
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if os.IsNotExist(e) {
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return probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
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}
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return probe.NewError(e)
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}
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if pathSt.IsDir() {
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// Verify if directory is empty.
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empty, e := isDirEmpty(deletePath)
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if e != nil {
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return probe.NewError(e)
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}
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if !empty {
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return nil
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}
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}
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// Attempt to remove path.
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if e := os.Remove(deletePath); e != nil {
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return probe.NewError(e)
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}
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// Recursively go down the next path and delete again.
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if err := deleteObjectPath(basePath, filepath.Dir(deletePath), bucket, object); err != nil {
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return err.Trace(basePath, deletePath, bucket, object)
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}
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return nil
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}
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// DeleteObject - delete object.
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func (fs Filesystem) DeleteObject(bucket, object string) *probe.Error {
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// Check bucket name valid
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if !IsValidBucketName(bucket) {
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return probe.NewError(BucketNameInvalid{Bucket: bucket})
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}
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bucket = getActualBucketname(fs.path, bucket)
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bucketPath := filepath.Join(fs.path, bucket)
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// Check bucket exists
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if _, e := os.Stat(bucketPath); e != nil {
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if os.IsNotExist(e) {
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return probe.NewError(BucketNotFound{Bucket: bucket})
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}
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return probe.NewError(e)
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}
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// Verify object path legal
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if !IsValidObjectName(object) {
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return probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: object})
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}
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// Do not use filepath.Join() since filepath.Join strips off any
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// object names with '/', use them as is in a static manner so
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// that we can send a proper 'ObjectNotFound' reply back upon
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// os.Stat().
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var objectPath string
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if runtime.GOOS == "windows" {
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objectPath = fs.path + string(os.PathSeparator) + bucket + string(os.PathSeparator) + object
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} else {
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objectPath = fs.path + string(os.PathSeparator) + bucket + string(os.PathSeparator) + object
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}
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// Delete object path if its empty.
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err := deleteObjectPath(bucketPath, objectPath, bucket, object)
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if err != nil {
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if os.IsNotExist(err.ToGoError()) {
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return probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
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}
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return err.Trace(bucketPath, objectPath, bucket, object)
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}
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return nil
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}
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