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minio/cmd/erasure-demo/main.go

115 lines
2.3 KiB

package main
import (
"errors"
"os"
"strconv"
"strings"
"github.com/codegangsta/cli"
"github.com/minio-io/minio/pkgs/strbyteconv"
)
func main() {
app := cli.NewApp()
app.Name = "erasure-demo"
app.Usage = "erasure encode a byte stream"
app.Commands = []cli.Command{
{
Name: "encode",
Usage: "erasure encode a byte stream",
Action: encode,
Flags: []cli.Flag{
cli.StringFlag{
Name: "output,o",
Value: "",
Usage: "Output file",
},
cli.StringFlag{
Name: "protection-level",
Value: "10,6",
Usage: "data,parity",
},
cli.StringFlag{
Name: "block-size",
Value: "1M",
Usage: "Size of blocks. Examples: 1K, 1M, full",
},
},
},
{
Name: "decode",
Usage: "erasure decode a byte stream",
Action: decode,
Flags: []cli.Flag{
cli.StringFlag{
Name: "output,o",
Value: "",
Usage: "Output file",
},
cli.StringFlag{
Name: "protection-level",
Value: "10,6",
Usage: "data,parity",
},
},
},
}
app.Run(os.Args)
}
// config representing cli input
type inputConfig struct {
input string
output string
k int
m int
blockSize uint64
}
// parses input and returns an inputConfig with parsed input
func parseInput(c *cli.Context) (inputConfig, error) {
// get input path
inputFilePath := c.Args().Get(0)
// get output path
outputFilePath := inputFilePath
if c.String("output") != "" {
outputFilePath = c.String("output")
}
protectionLevel := c.String("protection-level")
protectionLevelSplit := strings.Split(protectionLevel, ",")
if len(protectionLevelSplit) != 2 {
return inputConfig{}, errors.New("Malformed input for protection-level")
}
k, err := strconv.Atoi(protectionLevelSplit[0])
if err != nil {
return inputConfig{}, err
}
m, err := strconv.Atoi(protectionLevelSplit[1])
if err != nil {
return inputConfig{}, err
}
var blockSize uint64
blockSize = 0
if c.String("block-size") != "" {
if c.String("block-size") != "full" {
blockSize, err = strbyteconv.StringToBytes(c.String("block-size"))
if err != nil {
return inputConfig{}, err
}
}
}
return inputConfig{
input: inputFilePath,
output: outputFilePath,
k: k,
m: m,
blockSize: blockSize,
}, nil
}