frostfs-node/cmd/frostfs-cli/modules/object/range.go
Pavel Karpy d6196c3971 [#2095] cli: Do not panic on object range
Also, includes range parsing error messages enhancement.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
2022-12-30 11:07:35 +03:00

184 lines
4.7 KiB
Go

package object
import (
"bytes"
"errors"
"fmt"
"io"
"os"
"strconv"
"strings"
internalclient "github.com/TrueCloudLab/frostfs-node/cmd/frostfs-cli/internal/client"
"github.com/TrueCloudLab/frostfs-node/cmd/frostfs-cli/internal/common"
"github.com/TrueCloudLab/frostfs-node/cmd/frostfs-cli/internal/commonflags"
"github.com/TrueCloudLab/frostfs-node/cmd/frostfs-cli/internal/key"
cid "github.com/TrueCloudLab/frostfs-sdk-go/container/id"
"github.com/TrueCloudLab/frostfs-sdk-go/object"
oid "github.com/TrueCloudLab/frostfs-sdk-go/object/id"
"github.com/spf13/cobra"
)
var objectRangeCmd = &cobra.Command{
Use: "range",
Short: "Get payload range data of an object",
Long: "Get payload range data of an object",
Run: getObjectRange,
}
func initObjectRangeCmd() {
commonflags.Init(objectRangeCmd)
initFlagSession(objectRangeCmd, "RANGE")
flags := objectRangeCmd.Flags()
flags.String(commonflags.CIDFlag, "", commonflags.CIDFlagUsage)
_ = objectRangeCmd.MarkFlagRequired(commonflags.CIDFlag)
flags.String(commonflags.OIDFlag, "", commonflags.OIDFlagUsage)
_ = objectRangeCmd.MarkFlagRequired(commonflags.OIDFlag)
flags.String("range", "", "Range to take data from in the form offset:length")
flags.String(fileFlag, "", "File to write object payload to. Default: stdout.")
flags.Bool(rawFlag, false, rawFlagDesc)
}
func getObjectRange(cmd *cobra.Command, _ []string) {
var cnr cid.ID
var obj oid.ID
objAddr := readObjectAddress(cmd, &cnr, &obj)
ranges, err := getRangeList(cmd)
common.ExitOnErr(cmd, "", err)
if len(ranges) != 1 {
common.ExitOnErr(cmd, "", fmt.Errorf("exactly one range must be specified, got: %d", len(ranges)))
}
var out io.Writer
filename := cmd.Flag(fileFlag).Value.String()
if filename == "" {
out = os.Stdout
} else {
f, err := os.OpenFile(filename, os.O_CREATE|os.O_WRONLY, os.ModePerm)
if err != nil {
common.ExitOnErr(cmd, "", fmt.Errorf("can't open file '%s': %w", filename, err))
}
defer f.Close()
out = f
}
pk := key.GetOrGenerate(cmd)
cli := internalclient.GetSDKClientByFlag(cmd, pk, commonflags.RPC)
var prm internalclient.PayloadRangePrm
prm.SetClient(cli)
Prepare(cmd, &prm)
readSession(cmd, &prm, pk, cnr, obj)
raw, _ := cmd.Flags().GetBool(rawFlag)
prm.SetRawFlag(raw)
prm.SetAddress(objAddr)
prm.SetRange(ranges[0])
prm.SetPayloadWriter(out)
_, err = internalclient.PayloadRange(prm)
if err != nil {
if ok := printSplitInfoErr(cmd, err); ok {
return
}
common.ExitOnErr(cmd, "can't get object payload range: %w", err)
}
if filename != "" {
cmd.Printf("[%s] Payload successfully saved\n", filename)
}
}
func printSplitInfoErr(cmd *cobra.Command, err error) bool {
var errSplitInfo *object.SplitInfoError
ok := errors.As(err, &errSplitInfo)
if ok {
cmd.PrintErrln("Object is complex, split information received.")
printSplitInfo(cmd, errSplitInfo.SplitInfo())
}
return ok
}
func printSplitInfo(cmd *cobra.Command, info *object.SplitInfo) {
bs, err := marshalSplitInfo(cmd, info)
common.ExitOnErr(cmd, "can't marshal split info: %w", err)
cmd.Println(string(bs))
}
func marshalSplitInfo(cmd *cobra.Command, info *object.SplitInfo) ([]byte, error) {
toJSON, _ := cmd.Flags().GetBool(commonflags.JSON)
toProto, _ := cmd.Flags().GetBool("proto")
switch {
case toJSON && toProto:
return nil, errors.New("'--json' and '--proto' flags are mutually exclusive")
case toJSON:
return info.MarshalJSON()
case toProto:
return info.Marshal()
default:
b := bytes.NewBuffer(nil)
if splitID := info.SplitID(); splitID != nil {
b.WriteString("Split ID: " + splitID.String() + "\n")
}
if link, ok := info.Link(); ok {
b.WriteString("Linking object: " + link.String() + "\n")
}
if last, ok := info.LastPart(); ok {
b.WriteString("Last object: " + last.String() + "\n")
}
return b.Bytes(), nil
}
}
func getRangeList(cmd *cobra.Command) ([]*object.Range, error) {
v := cmd.Flag("range").Value.String()
if len(v) == 0 {
return nil, nil
}
vs := strings.Split(v, ",")
rs := make([]*object.Range, len(vs))
for i := range vs {
r := strings.Split(vs[i], rangeSep)
if len(r) != 2 {
return nil, fmt.Errorf("invalid range specifier: %s", vs[i])
}
offset, err := strconv.ParseUint(r[0], 10, 64)
if err != nil {
return nil, fmt.Errorf("invalid '%s' range offset specifier: %w", vs[i], err)
}
length, err := strconv.ParseUint(r[1], 10, 64)
if err != nil {
return nil, fmt.Errorf("invalid '%s' range length specifier: %w", vs[i], err)
}
if length == 0 {
return nil, fmt.Errorf("invalid '%s' range: zero length", vs[i])
}
if offset+length <= offset {
return nil, fmt.Errorf("invalid '%s' range: uint64 overflow", vs[i])
}
rs[i] = object.NewRange()
rs[i].SetOffset(offset)
rs[i].SetLength(length)
}
return rs, nil
}