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/*
* Minimalist Object 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 donut
import (
"encoding/base64"
"encoding/hex"
"io"
"os"
"path/filepath"
"sort"
"strconv"
"strings"
"sync"
"io/ioutil"
"github.com/minio/minio/pkg/iodine"
"github.com/minio/minio/pkg/storage/donut"
"github.com/minio/minio/pkg/storage/drivers"
"github.com/minio/minio/pkg/utils/log"
)
// donutDriver - creates a new single disk drivers driver using donut
type donutDriver struct {
donut donut.Donut
paths []string
lock *sync.RWMutex
}
// This is a dummy nodeDiskMap which is going to be deprecated soon
// once the Management API is standardized, this map is useful for now
// to show multi disk API correctness and parity calculation
//
// Ideally this should be obtained from per node configuration file
func createNodeDiskMap(p string) map[string][]string {
nodes := make(map[string][]string)
nodes["localhost"] = make([]string, 16)
for i := 0; i < len(nodes["localhost"]); i++ {
diskPath := filepath.Join(p, strconv.Itoa(i))
if _, err := os.Stat(diskPath); err != nil {
if os.IsNotExist(err) {
os.MkdirAll(diskPath, 0700)
}
}
nodes["localhost"][i] = diskPath
}
return nodes
}
// This is a dummy nodeDiskMap which is going to be deprecated soon
// once the Management API is standardized, and we have way of adding
// and removing disks. This is useful for now to take inputs from CLI
func createNodeDiskMapFromSlice(paths []string) map[string][]string {
diskPaths := make([]string, len(paths))
nodes := make(map[string][]string)
for i, p := range paths {
diskPath := filepath.Join(p, strconv.Itoa(i))
if _, err := os.Stat(diskPath); err != nil {
if os.IsNotExist(err) {
os.MkdirAll(diskPath, 0700)
}
}
diskPaths[i] = diskPath
}
nodes["localhost"] = diskPaths
return nodes
}
// Start a single disk subsystem
func Start(paths []string) (chan<- string, <-chan error, drivers.Driver) {
ctrlChannel := make(chan string)
errorChannel := make(chan error)
// Soon to be user configurable, when Management API is available
// we should remove "default" to something which is passed down
// from configuration paramters
var d donut.Donut
var err error
if len(paths) == 1 {
d, err = donut.NewDonut("default", createNodeDiskMap(paths[0]))
if err != nil {
err = iodine.New(err, nil)
log.Error.Println(err)
}
} else {
d, err = donut.NewDonut("default", createNodeDiskMapFromSlice(paths))
if err != nil {
err = iodine.New(err, nil)
log.Error.Println(err)
}
}
s := new(donutDriver)
s.donut = d
s.paths = paths
s.lock = new(sync.RWMutex)
go start(ctrlChannel, errorChannel, s)
return ctrlChannel, errorChannel, s
}
func start(ctrlChannel <-chan string, errorChannel chan<- error, s *donutDriver) {
close(errorChannel)
}
// byBucketName is a type for sorting bucket metadata by bucket name
type byBucketName []drivers.BucketMetadata
func (b byBucketName) Len() int { return len(b) }
func (b byBucketName) Swap(i, j int) { b[i], b[j] = b[j], b[i] }
func (b byBucketName) Less(i, j int) bool { return b[i].Name < b[j].Name }
// ListBuckets returns a list of buckets
func (d donutDriver) ListBuckets() (results []drivers.BucketMetadata, err error) {
d.lock.RLock()
defer d.lock.RUnlock()
if d.donut == nil {
return nil, iodine.New(drivers.InternalError{}, nil)
}
buckets, err := d.donut.ListBuckets()
if err != nil {
return nil, err
}
for name, metadata := range buckets {
result := drivers.BucketMetadata{
Name: name,
Created: metadata.Created,
}
results = append(results, result)
}
sort.Sort(byBucketName(results))
return results, nil
}
// CreateBucket creates a new bucket
func (d donutDriver) CreateBucket(bucketName, acl string) error {
d.lock.Lock()
defer d.lock.Unlock()
if d.donut == nil {
return iodine.New(drivers.InternalError{}, nil)
}
if !drivers.IsValidBucketACL(acl) {
return iodine.New(drivers.InvalidACL{ACL: acl}, nil)
}
if drivers.IsValidBucket(bucketName) && !strings.Contains(bucketName, ".") {
if strings.TrimSpace(acl) == "" {
acl = "private"
}
if err := d.donut.MakeBucket(bucketName, acl); err != nil {
switch iodine.ToError(err).(type) {
case donut.BucketExists:
return iodine.New(drivers.BucketExists{Bucket: bucketName}, nil)
}
return iodine.New(err, nil)
}
return nil
}
return iodine.New(drivers.BucketNameInvalid{Bucket: bucketName}, nil)
}
// GetBucketMetadata retrieves an bucket's metadata
func (d donutDriver) GetBucketMetadata(bucketName string) (drivers.BucketMetadata, error) {
d.lock.RLock()
defer d.lock.RUnlock()
if d.donut == nil {
return drivers.BucketMetadata{}, iodine.New(drivers.InternalError{}, nil)
}
if !drivers.IsValidBucket(bucketName) || strings.Contains(bucketName, ".") {
return drivers.BucketMetadata{}, drivers.BucketNameInvalid{Bucket: bucketName}
}
metadata, err := d.donut.GetBucketMetadata(bucketName)
if err != nil {
return drivers.BucketMetadata{}, iodine.New(drivers.BucketNotFound{Bucket: bucketName}, nil)
}
bucketMetadata := drivers.BucketMetadata{
Name: bucketName,
Created: metadata.Created,
ACL: drivers.BucketACL(metadata.ACL),
}
return bucketMetadata, nil
}
// SetBucketMetadata sets bucket's metadata
func (d donutDriver) SetBucketMetadata(bucketName, acl string) error {
d.lock.Lock()
defer d.lock.Unlock()
if d.donut == nil {
return iodine.New(drivers.InternalError{}, nil)
}
if !drivers.IsValidBucket(bucketName) || strings.Contains(bucketName, ".") {
return iodine.New(drivers.BucketNameInvalid{Bucket: bucketName}, nil)
}
if strings.TrimSpace(acl) == "" {
acl = "private"
}
bucketMetadata := make(map[string]string)
bucketMetadata["acl"] = acl
err := d.donut.SetBucketMetadata(bucketName, bucketMetadata)
if err != nil {
return iodine.New(drivers.BucketNotFound{Bucket: bucketName}, nil)
}
return nil
}
// GetObject retrieves an object and writes it to a writer
func (d donutDriver) GetObject(target io.Writer, bucketName, objectName string) (int64, error) {
d.lock.RLock()
defer d.lock.RUnlock()
if d.donut == nil {
return 0, iodine.New(drivers.InternalError{}, nil)
}
if !drivers.IsValidBucket(bucketName) || strings.Contains(bucketName, ".") {
return 0, iodine.New(drivers.BucketNameInvalid{Bucket: bucketName}, nil)
}
if !drivers.IsValidObjectName(objectName) || strings.TrimSpace(objectName) == "" {
return 0, iodine.New(drivers.ObjectNameInvalid{Object: objectName}, nil)
}
reader, size, err := d.donut.GetObject(bucketName, objectName)
if err != nil {
return 0, iodine.New(drivers.ObjectNotFound{
Bucket: bucketName,
Object: objectName,
}, nil)
}
n, err := io.CopyN(target, reader, size)
return n, iodine.New(err, nil)
}
// GetPartialObject retrieves an object range and writes it to a writer
func (d donutDriver) GetPartialObject(w io.Writer, bucketName, objectName string, start, length int64) (int64, error) {
d.lock.RLock()
defer d.lock.RUnlock()
if d.donut == nil {
return 0, iodine.New(drivers.InternalError{}, nil)
}
errParams := map[string]string{
"bucketName": bucketName,
"objectName": objectName,
"start": strconv.FormatInt(start, 10),
"length": strconv.FormatInt(length, 10),
}
if !drivers.IsValidBucket(bucketName) || strings.Contains(bucketName, ".") {
return 0, iodine.New(drivers.BucketNameInvalid{Bucket: bucketName}, errParams)
}
if !drivers.IsValidObjectName(objectName) || strings.TrimSpace(objectName) == "" {
return 0, iodine.New(drivers.ObjectNameInvalid{Object: objectName}, errParams)
}
if start < 0 {
return 0, iodine.New(drivers.InvalidRange{
Start: start,
Length: length,
}, errParams)
}
reader, size, err := d.donut.GetObject(bucketName, objectName)
if err != nil {
return 0, iodine.New(drivers.ObjectNotFound{
Bucket: bucketName,
Object: objectName,
}, nil)
}
defer reader.Close()
if start > size || (start+length-1) > size {
return 0, iodine.New(drivers.InvalidRange{
Start: start,
Length: length,
}, errParams)
}
_, err = io.CopyN(ioutil.Discard, reader, start)
if err != nil {
return 0, iodine.New(err, errParams)
}
n, err := io.CopyN(w, reader, length)
if err != nil {
return 0, iodine.New(err, errParams)
}
return n, nil
}
// GetObjectMetadata retrieves an object's metadata
func (d donutDriver) GetObjectMetadata(bucketName, objectName string) (drivers.ObjectMetadata, error) {
d.lock.RLock()
defer d.lock.RUnlock()
errParams := map[string]string{
"bucketName": bucketName,
"objectName": objectName,
}
if d.donut == nil {
return drivers.ObjectMetadata{}, iodine.New(drivers.InternalError{}, errParams)
}
if !drivers.IsValidBucket(bucketName) || strings.Contains(bucketName, ".") {
return drivers.ObjectMetadata{}, iodine.New(drivers.BucketNameInvalid{Bucket: bucketName}, errParams)
}
if !drivers.IsValidObjectName(objectName) || strings.TrimSpace(objectName) == "" {
return drivers.ObjectMetadata{}, iodine.New(drivers.ObjectNameInvalid{Object: objectName}, errParams)
}
metadata, err := d.donut.GetObjectMetadata(bucketName, objectName)
if err != nil {
return drivers.ObjectMetadata{}, iodine.New(drivers.ObjectNotFound{
Bucket: bucketName,
Object: objectName,
}, errParams)
}
objectMetadata := drivers.ObjectMetadata{
Bucket: bucketName,
Key: objectName,
ContentType: metadata.Metadata["contentType"],
Created: metadata.Created,
Md5: metadata.MD5Sum,
Size: metadata.Size,
}
return objectMetadata, nil
}
// ListObjects - returns list of objects
func (d donutDriver) ListObjects(bucketName string, resources drivers.BucketResourcesMetadata) ([]drivers.ObjectMetadata, drivers.BucketResourcesMetadata, error) {
d.lock.RLock()
defer d.lock.RUnlock()
errParams := map[string]string{
"bucketName": bucketName,
}
if d.donut == nil {
return nil, drivers.BucketResourcesMetadata{}, iodine.New(drivers.InternalError{}, errParams)
}
if !drivers.IsValidBucket(bucketName) || strings.Contains(bucketName, ".") {
return nil, drivers.BucketResourcesMetadata{}, iodine.New(drivers.BucketNameInvalid{Bucket: bucketName}, nil)
}
if !drivers.IsValidObjectName(resources.Prefix) {
return nil, drivers.BucketResourcesMetadata{}, iodine.New(drivers.ObjectNameInvalid{Object: resources.Prefix}, nil)
}
listObjects, err := d.donut.ListObjects(bucketName, resources.Prefix, resources.Marker, resources.Delimiter, resources.Maxkeys)
if err != nil {
return nil, drivers.BucketResourcesMetadata{}, iodine.New(err, errParams)
}
resources.CommonPrefixes = listObjects.CommonPrefixes
resources.IsTruncated = listObjects.IsTruncated
if resources.IsTruncated && resources.IsDelimiterSet() {
resources.NextMarker = listObjects.Objects[len(listObjects.Objects)-1]
}
// make sure to keep the lexical order same as returned by donut
// we do not have to sort here again
results := make([]drivers.ObjectMetadata, len(listObjects.Objects))
for i, objectName := range listObjects.Objects {
objectMetadata, err := d.donut.GetObjectMetadata(bucketName, objectName)
if err != nil {
return nil, drivers.BucketResourcesMetadata{}, iodine.New(err, errParams)
}
metadata := drivers.ObjectMetadata{
Key: objectMetadata.Object,
Created: objectMetadata.Created,
Size: objectMetadata.Size,
}
results[i] = metadata
}
return results, resources, nil
}
// CreateObject creates a new object
func (d donutDriver) CreateObject(bucketName, objectName, contentType, expectedMD5Sum string, size int64, reader io.Reader) (string, error) {
d.lock.Lock()
defer d.lock.Unlock()
errParams := map[string]string{
"bucketName": bucketName,
"objectName": objectName,
"contentType": contentType,
}
if d.donut == nil {
return "", iodine.New(drivers.InternalError{}, errParams)
}
if !drivers.IsValidBucket(bucketName) || strings.Contains(bucketName, ".") {
return "", iodine.New(drivers.BucketNameInvalid{Bucket: bucketName}, nil)
}
if !drivers.IsValidObjectName(objectName) || strings.TrimSpace(objectName) == "" {
return "", iodine.New(drivers.ObjectNameInvalid{Object: objectName}, nil)
}
if strings.TrimSpace(contentType) == "" {
contentType = "application/octet-stream"
}
metadata := make(map[string]string)
metadata["contentType"] = strings.TrimSpace(contentType)
metadata["contentLength"] = strconv.FormatInt(size, 10)
if strings.TrimSpace(expectedMD5Sum) != "" {
expectedMD5SumBytes, err := base64.StdEncoding.DecodeString(strings.TrimSpace(expectedMD5Sum))
if err != nil {
return "", iodine.New(err, nil)
}
expectedMD5Sum = hex.EncodeToString(expectedMD5SumBytes)
}
calculatedMD5Sum, err := d.donut.PutObject(bucketName, objectName, expectedMD5Sum, ioutil.NopCloser(reader), metadata)
if err != nil {
return "", iodine.New(err, errParams)
}
return calculatedMD5Sum, nil
}
func (d donutDriver) ListMultipartUploads(bucket string, resources drivers.BucketMultipartResourcesMetadata) (drivers.BucketMultipartResourcesMetadata, error) {
return drivers.BucketMultipartResourcesMetadata{}, iodine.New(drivers.APINotImplemented{API: "ListMultipartUploads"}, nil)
}
func (d donutDriver) NewMultipartUpload(bucket, key, contentType string) (string, error) {
return "", iodine.New(drivers.APINotImplemented{API: "NewMultipartUpload"}, nil)
}
func (d donutDriver) CreateObjectPart(bucket, key, uploadID string, partID int, contentType, expectedMD5Sum string, size int64, data io.Reader) (string, error) {
return "", iodine.New(drivers.APINotImplemented{API: "CreateObjectPart"}, nil)
}
func (d donutDriver) CompleteMultipartUpload(bucket, key, uploadID string, parts map[int]string) (string, error) {
return "", iodine.New(drivers.APINotImplemented{API: "CompleteMultipartUpload"}, nil)
}
func (d donutDriver) ListObjectParts(bucket, key string, resources drivers.ObjectResourcesMetadata) (drivers.ObjectResourcesMetadata, error) {
return drivers.ObjectResourcesMetadata{}, iodine.New(drivers.APINotImplemented{API: "ListObjectParts"}, nil)
}
func (d donutDriver) AbortMultipartUpload(bucket, key, uploadID string) error {
return iodine.New(drivers.APINotImplemented{API: "AbortMultipartUpload"}, nil)
}