You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
86 lines
2.2 KiB
86 lines
2.2 KiB
/*
|
|
* Minio Cloud Storage, (C) 2016 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 main
|
|
|
|
import (
|
|
"bytes"
|
|
"io"
|
|
"math/rand"
|
|
"path"
|
|
"time"
|
|
)
|
|
|
|
// randInts - uses Knuth Fisher-Yates shuffle algorithm for generating uniform shuffling.
|
|
func randInts(count int) []int {
|
|
rand.Seed(time.Now().UTC().UnixNano()) // Seed with current time.
|
|
ints := make([]int, count)
|
|
for i := 0; i < count; i++ {
|
|
ints[i] = i + 1
|
|
}
|
|
for i := 0; i < count; i++ {
|
|
// Choose index uniformly in [i, count-1]
|
|
r := i + rand.Intn(count-i)
|
|
ints[r], ints[i] = ints[i], ints[r]
|
|
}
|
|
return ints
|
|
}
|
|
|
|
// readAll - returns contents from volume/path as byte array.
|
|
func readAll(disk StorageAPI, volume string, path string) ([]byte, error) {
|
|
var writer = new(bytes.Buffer)
|
|
startOffset := int64(0)
|
|
|
|
// Allocate 10MiB buffer.
|
|
buf := make([]byte, blockSizeV1)
|
|
|
|
// Read until io.EOF.
|
|
for {
|
|
n, err := disk.ReadFile(volume, path, startOffset, buf)
|
|
if err == io.EOF {
|
|
break
|
|
}
|
|
if err != nil && err != io.EOF {
|
|
return nil, err
|
|
}
|
|
writer.Write(buf[:n])
|
|
startOffset += n
|
|
}
|
|
return writer.Bytes(), nil
|
|
}
|
|
|
|
// readXLMeta reads `xl.json` returns contents as byte array.
|
|
func readXLMeta(disk StorageAPI, bucket string, object string) ([]byte, error) {
|
|
var writer = new(bytes.Buffer)
|
|
startOffset := int64(0)
|
|
|
|
// Allocate 2MiB buffer, this is sufficient for the most of `xl.json`.
|
|
buf := make([]byte, 2*1024*1024)
|
|
|
|
// Read until io.EOF.
|
|
for {
|
|
n, err := disk.ReadFile(bucket, path.Join(object, xlMetaJSONFile), startOffset, buf)
|
|
if err == io.EOF {
|
|
break
|
|
}
|
|
if err != nil && err != io.EOF {
|
|
return nil, err
|
|
}
|
|
writer.Write(buf[:n])
|
|
startOffset += n
|
|
}
|
|
return writer.Bytes(), nil
|
|
}
|
|
|