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Merge pull request #345 from fkautz/pr_out_adding_sha512_support_for_pre_encoded_data_and_verification_on_decode

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This commit is contained in:
Frederick F. Kautz IV 2015-03-22 20:11:52 -07:00
commit 9d5a6329ba
1 changed files with 16 additions and 0 deletions
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16
pkg/storage/donut/erasure.go
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@ -6,16 +6,22 @@ import (
"strconv"
"time"
"encoding/hex"
"errors"
"github.com/minio-io/minio/pkg/encoding/erasure"
"github.com/minio-io/minio/pkg/utils/crypto/sha512"
"github.com/minio-io/minio/pkg/utils/split"
)
func erasureReader(readers []io.ReadCloser, donutMetadata map[string]string, writer *io.PipeWriter) {
// TODO handle errors
totalChunks, _ := strconv.Atoi(donutMetadata["chunkCount"])
totalLeft, _ := strconv.Atoi(donutMetadata["totalLength"])
blockSize, _ := strconv.Atoi(donutMetadata["blockSize"])
k, _ := strconv.Atoi(donutMetadata["erasureK"])
m, _ := strconv.Atoi(donutMetadata["erasureM"])
expectedSha512, _ := hex.DecodeString(donutMetadata["sha512"])
summer := sha512.New()
// TODO select technique properly
params, _ := erasure.ParseEncoderParams(uint8(k), uint8(m), erasure.Cauchy)
encoder := erasure.NewEncoder(params)
@ -32,6 +38,7 @@ func erasureReader(readers []io.ReadCloser, donutMetadata map[string]string, wri
encodedBytes := make([][]byte, 16)
for i, reader := range readers {
var bytesBuffer bytes.Buffer
// TODO watch for errors
io.CopyN(&bytesBuffer, reader, int64(curChunkSize))
encodedBytes[i] = bytesBuffer.Bytes()
}
@ -40,9 +47,14 @@ func erasureReader(readers []io.ReadCloser, donutMetadata map[string]string, wri
writer.CloseWithError(err)
return
}
summer.Write(decodedData)
io.Copy(writer, bytes.NewBuffer(decodedData))
totalLeft = totalLeft - blockSize
}
actualSha512 := summer.Sum(nil)
if bytes.Compare(expectedSha512, actualSha512) != 0 {
writer.CloseWithError(errors.New("decoded sha512 did not match"))
}
writer.Close()
}
@ -75,16 +87,19 @@ func erasureGoroutine(r *io.PipeReader, eWriter erasureWriter, isClosed chan<- b
encoder := erasure.NewEncoder(params)
chunkCount := 0
totalLength := 0
summer := sha512.New()
for chunk := range chunks {
if chunk.Err == nil {
totalLength = totalLength + len(chunk.Data)
encodedBlocks, _ := encoder.Encode(chunk.Data)
summer.Write(chunk.Data)
for blockIndex, block := range encodedBlocks {
io.Copy(eWriter.writers[blockIndex], bytes.NewBuffer(block))
}
}
chunkCount = chunkCount + 1
}
dataSha512 := summer.Sum(nil)
metadata := make(map[string]string)
metadata["blockSize"] = strconv.Itoa(10 * 1024 * 1024)
metadata["chunkCount"] = strconv.Itoa(chunkCount)
@ -93,6 +108,7 @@ func erasureGoroutine(r *io.PipeReader, eWriter erasureWriter, isClosed chan<- b
metadata["erasureM"] = "8"
metadata["erasureTechnique"] = "Cauchy"
metadata["totalLength"] = strconv.Itoa(totalLength)
metadata["sha512"] = hex.EncodeToString(dataSha512)
for _, nodeWriter := range eWriter.writers {
if nodeWriter != nil {
nodeWriter.SetMetadata(eWriter.metadata)