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/*
* MinIO Go Library for Amazon S3 Compatible Cloud Storage
* Copyright 2015-2017 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 minio
import (
"context"
"io"
"math"
"os"
"github.com/minio/minio-go/v7/pkg/s3utils"
)
const nullVersionID = "null"
// Verify if reader is *minio.Object
func isObject(reader io.Reader) (ok bool) {
_, ok = reader.(*Object)
return
}
// Verify if reader is a generic ReaderAt
func isReadAt(reader io.Reader) (ok bool) {
var v *os.File
v, ok = reader.(*os.File)
if ok {
// Stdin, Stdout and Stderr all have *os.File type
// which happen to also be io.ReaderAt compatible
// we need to add special conditions for them to
// be ignored by this function.
for _, f := range []string{
"/dev/stdin",
"/dev/stdout",
"/dev/stderr",
} {
if f == v.Name() {
ok = false
break
}
}
} else {
_, ok = reader.(io.ReaderAt)
}
return
}
// OptimalPartInfo - calculate the optimal part info for a given
// object size.
//
// NOTE: Assumption here is that for any object to be uploaded to any S3 compatible
// object storage it will have the following parameters as constants.
//
// maxPartsCount - 10000
// minPartSize - 16MiB
// maxMultipartPutObjectSize - 5TiB
func OptimalPartInfo(objectSize int64, configuredPartSize uint64) (totalPartsCount int, partSize, lastPartSize int64, err error) {
// object size is '-1' set it to 5TiB.
var unknownSize bool
if objectSize == -1 {
unknownSize = true
objectSize = maxMultipartPutObjectSize
}
// object size is larger than supported maximum.
if objectSize > maxMultipartPutObjectSize {
err = errEntityTooLarge(objectSize, maxMultipartPutObjectSize, "", "")
return
}
var partSizeFlt float64
if configuredPartSize > 0 {
if int64(configuredPartSize) > objectSize {
err = errEntityTooLarge(int64(configuredPartSize), objectSize, "", "")
return
}
if !unknownSize {
if objectSize > (int64(configuredPartSize) * maxPartsCount) {
err = errInvalidArgument("Part size * max_parts(10000) is lesser than input objectSize.")
return
}
}
if configuredPartSize < absMinPartSize {
err = errInvalidArgument("Input part size is smaller than allowed minimum of 5MiB.")
return
}
if configuredPartSize > maxPartSize {
err = errInvalidArgument("Input part size is bigger than allowed maximum of 5GiB.")
return
}
partSizeFlt = float64(configuredPartSize)
if unknownSize {
// If input has unknown size and part size is configured
// keep it to maximum allowed as per 10000 parts.
objectSize = int64(configuredPartSize) * maxPartsCount
}
} else {
configuredPartSize = minPartSize
// Use floats for part size for all calculations to avoid
// overflows during float64 to int64 conversions.
partSizeFlt = float64(objectSize / maxPartsCount)
partSizeFlt = math.Ceil(partSizeFlt/float64(configuredPartSize)) * float64(configuredPartSize)
}
// Total parts count.
totalPartsCount = int(math.Ceil(float64(objectSize) / partSizeFlt))
// Part size.
partSize = int64(partSizeFlt)
// Last part size.
lastPartSize = objectSize - int64(totalPartsCount-1)*partSize
return totalPartsCount, partSize, lastPartSize, nil
}
// getUploadID - fetch upload id if already present for an object name
// or initiate a new request to fetch a new upload id.
func (c *Client) newUploadID(ctx context.Context, bucketName, objectName string, opts PutObjectOptions) (uploadID string, err error) {
// Input validation.
if err := s3utils.CheckValidBucketName(bucketName); err != nil {
return "", err
}
if err := s3utils.CheckValidObjectName(objectName); err != nil {
return "", err
}
// Initiate multipart upload for an object.
initMultipartUploadResult, err := c.initiateMultipartUpload(ctx, bucketName, objectName, opts)
if err != nil {
return "", err
}
return initMultipartUploadResult.UploadID, nil
}
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