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91 lines
2.6 KiB
91 lines
2.6 KiB
/*
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* Minio Cloud Storage, (C) 2016 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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"encoding/hex"
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"hash"
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"github.com/klauspost/reedsolomon"
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)
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// erasure storage layer.
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type erasureConfig struct {
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reedSolomon reedsolomon.Encoder // Erasure encoder/decoder.
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dataBlocks int // Calculated data disks.
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storageDisks []StorageAPI // Initialized storage disks.
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distribution []int // Erasure block distribution.
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hashWriters []hash.Hash // Allocate hash writers.
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// Carries hex checksums needed for validating Reads.
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hashChecksums []string
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checkSumAlgo string
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}
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// newErasure instantiate a new erasure.
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func newErasure(disks []StorageAPI, distribution []int) *erasureConfig {
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// Initialize E.
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e := &erasureConfig{}
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// Calculate data and parity blocks.
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dataBlocks, parityBlocks := len(disks)/2, len(disks)/2
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// Initialize reed solomon encoding.
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rs, err := reedsolomon.New(dataBlocks, parityBlocks)
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fatalIf(err, "Unable to initialize reedsolomon package.")
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// Save the reedsolomon.
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e.dataBlocks = dataBlocks
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e.reedSolomon = rs
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// Save all the initialized storage disks.
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e.storageDisks = disks
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// Save the distribution.
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e.distribution = distribution
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// Return successfully initialized.
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return e
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}
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// SaveAlgo - FIXME.
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func (e *erasureConfig) SaveAlgo(algo string) {
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e.checkSumAlgo = algo
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}
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// Save hex encoded hashes - saves hashes that need to be validated
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// during reads for each blocks.
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func (e *erasureConfig) SaveHashes(hashes []string) {
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e.hashChecksums = hashes
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}
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// InitHash - initializes new hash for all blocks.
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func (e *erasureConfig) InitHash(algo string) {
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e.hashWriters = make([]hash.Hash, len(e.storageDisks))
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for index := range e.storageDisks {
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e.hashWriters[index] = newHash(algo)
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}
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}
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// GetHashes - returns a slice of hex encoded hash.
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func (e erasureConfig) GetHashes() []string {
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var hexHashes = make([]string, len(e.storageDisks))
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for index, hashWriter := range e.hashWriters {
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hexHashes[index] = hex.EncodeToString(hashWriter.Sum(nil))
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}
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return hexHashes
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}
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