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Add crc32c checksum support for erasure chunks

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Now upon conditions

 - if checksum '.cksum' file is missing
 - or corrupted chunk (mismatching chunk)
 - or missing chunk entirely

Decoding works consistently
This commit is contained in:
Harshavardhana 2014-12-10 00:58:12 -08:00
parent 3fe2c2af01
commit 01c0e45b5c
2 changed files with 31 additions and 1 deletions
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17
cmd/erasure-demo/decode.go
View File

@ -7,6 +7,7 @@ import (
"strconv"
"github.com/codegangsta/cli"
"github.com/minio-io/minio/pkgs/checksum/crc32c"
"github.com/minio-io/minio/pkgs/erasure"
)
@ -58,8 +59,23 @@ func decode(c *cli.Context) {
for _, inputFile := range inputFiles {
// get chunks
chunks := make([][]byte, k+m)
// get checksum
cksums := make([][]byte, k+m)
for i := 0; i < k+m; i++ {
chunks[i], _ = ioutil.ReadFile(inputFile + "." + strconv.Itoa(i))
cksums[i], _ = ioutil.ReadFile(inputFile + "." + strconv.Itoa(i) + ".cksum")
}
for i := 0; i < k+m; i++ {
crcChunk, err := crc32c.Crc32c(chunks[i])
if err != nil {
chunks[i] = nil
continue
}
crcChunkStr := strconv.Itoa(int(crcChunk))
if string(cksums[i]) != crcChunkStr {
chunks[i] = nil
}
}
// get length
@ -67,6 +83,7 @@ func decode(c *cli.Context) {
if err != nil {
log.Fatal(err)
}
lengthString := string(lengthBytes)
length, err := strconv.Atoi(lengthString)
if err != nil {

17
cmd/erasure-demo/encode.go
View File

@ -8,6 +8,7 @@ import (
"strconv"
"github.com/codegangsta/cli"
"github.com/minio-io/minio/pkgs/checksum/crc32c"
"github.com/minio-io/minio/pkgs/erasure"
"github.com/minio-io/minio/pkgs/split"
)
@ -47,6 +48,12 @@ func encode(c *cli.Context) {
if config.blockSize == 0 {
encodedData, length := encoder.Encode(input)
for key, data := range encodedData {
crc, err := crc32c.Crc32c(data)
if err != nil {
log.Fatal(err)
}
crcString := strconv.Itoa(int(crc))
ioutil.WriteFile(config.output+"."+strconv.Itoa(key)+".cksum", []byte(crcString), 0600)
ioutil.WriteFile(config.output+"."+strconv.Itoa(key), data, 0600)
ioutil.WriteFile(config.output+".length", []byte(strconv.Itoa(length)), 0600)
}
@ -61,9 +68,15 @@ func encode(c *cli.Context) {
}
encodedData, length := encoder.Encode(chunk.Data)
for key, data := range encodedData {
ioutil.WriteFile(config.output+"."+strconv.Itoa(chunkCount)+"."+strconv.Itoa(key), data, 0600)
ioutil.WriteFile(config.output+"."+strconv.Itoa(chunkCount)+".length", []byte(strconv.Itoa(length)), 0600)
crc, err := crc32c.Crc32c(data)
if err != nil {
log.Fatal(err)
}
crcString := strconv.Itoa(int(crc))
ioutil.WriteFile(config.output+"."+strconv.Itoa(chunkCount)+"."+strconv.Itoa(key)+".cksum", []byte(crcString), 0600)
ioutil.WriteFile(config.output+"."+strconv.Itoa(chunkCount)+"."+strconv.Itoa(key), data, 0600)
}
ioutil.WriteFile(config.output+"."+strconv.Itoa(chunkCount)+".length", []byte(strconv.Itoa(length)), 0600)
chunkCount += 1
}
}