mirror of
https://github.com/minio/minio.git
synced 2024-12-26 07:05:55 -05:00
82 lines
2.1 KiB
Go
82 lines
2.1 KiB
Go
/*
|
|
* 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 (
|
|
"encoding/json"
|
|
"math/rand"
|
|
"path"
|
|
"time"
|
|
)
|
|
|
|
// Validates if we have quorum based on the errors with errDiskNotFound.
|
|
func isQuorum(errs []error, minQuorumCount int) bool {
|
|
var diskFoundCount int
|
|
for _, err := range errs {
|
|
if err == errDiskNotFound {
|
|
continue
|
|
}
|
|
diskFoundCount++
|
|
}
|
|
return diskFoundCount >= minQuorumCount
|
|
}
|
|
|
|
// Similar to 'len(slice)' but returns the actual elements count
|
|
// skipping the unallocated elements.
|
|
func diskCount(disks []StorageAPI) int {
|
|
diskCount := 0
|
|
for _, disk := range disks {
|
|
if disk == nil {
|
|
continue
|
|
}
|
|
diskCount++
|
|
}
|
|
return diskCount
|
|
}
|
|
|
|
// 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
|
|
}
|
|
|
|
// readXLMeta reads `xl.json` and returns back XL metadata structure.
|
|
func readXLMeta(disk StorageAPI, bucket string, object string) (xlMeta xlMetaV1, err error) {
|
|
// Reads entire `xl.json`.
|
|
buf, err := disk.ReadAll(bucket, path.Join(object, xlMetaJSONFile))
|
|
if err != nil {
|
|
return xlMetaV1{}, err
|
|
}
|
|
|
|
// Unmarshal xl metadata.
|
|
if err = json.Unmarshal(buf, &xlMeta); err != nil {
|
|
return xlMetaV1{}, err
|
|
}
|
|
|
|
// Return structured `xl.json`.
|
|
return xlMeta, nil
|
|
}
|