117 lines
2.9 KiB
Go
117 lines
2.9 KiB
Go
package snapshot
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import (
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"archive/tar"
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"bytes"
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"compress/gzip"
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"errors"
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"fmt"
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"io"
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"os"
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"reflect"
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"strconv"
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"github.com/spf13/cobra"
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snapshottypes "cosmossdk.io/store/snapshots/types"
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"github.com/cosmos/cosmos-sdk/client"
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"github.com/cosmos/cosmos-sdk/server"
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)
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const SnapshotFileName = "_snapshot"
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// LoadArchiveCmd load a portable archive format snapshot into snapshot store
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func LoadArchiveCmd() *cobra.Command {
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return &cobra.Command{
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Use: "load <archive-file>",
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Short: "Load a snapshot archive file (.tar.gz) into snapshot store",
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Args: cobra.ExactArgs(1),
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RunE: func(cmd *cobra.Command, args []string) error {
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viper := client.GetViperFromCmd(cmd)
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snapshotStore, err := server.GetSnapshotStore(viper)
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if err != nil {
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return err
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}
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path := args[0]
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fp, err := os.Open(path)
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if err != nil {
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return fmt.Errorf("failed to open archive file: %w", err)
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}
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reader, err := gzip.NewReader(fp)
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if err != nil {
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return fmt.Errorf("failed to create gzip reader: %w", err)
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}
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var snapshot snapshottypes.Snapshot
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tr := tar.NewReader(reader)
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if err != nil {
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return fmt.Errorf("failed to create tar reader: %w", err)
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}
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hdr, err := tr.Next()
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if err != nil {
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return fmt.Errorf("failed to read snapshot file header: %w", err)
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}
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if hdr.Name != SnapshotFileName {
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return fmt.Errorf("invalid archive, expect file: snapshot, got: %s", hdr.Name)
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}
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bz, err := io.ReadAll(tr)
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if err != nil {
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return fmt.Errorf("failed to read snapshot file: %w", err)
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}
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if err := snapshot.Unmarshal(bz); err != nil {
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return fmt.Errorf("failed to unmarshal snapshot: %w", err)
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}
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// make sure the channel is unbuffered, because the tar reader can't do concurrency
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chunks := make(chan io.ReadCloser)
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quitChan := make(chan *snapshottypes.Snapshot)
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go func() {
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defer close(quitChan)
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savedSnapshot, err := snapshotStore.Save(snapshot.Height, snapshot.Format, chunks)
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if err != nil {
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cmd.Println("failed to save snapshot", err)
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return
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}
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quitChan <- savedSnapshot
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}()
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for i := uint32(0); i < snapshot.Chunks; i++ {
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hdr, err = tr.Next()
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if err != nil {
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if errors.Is(err, io.EOF) {
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break
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}
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return err
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}
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if hdr.Name != strconv.FormatInt(int64(i), 10) {
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return fmt.Errorf("invalid archive, expect file: %d, got: %s", i, hdr.Name)
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}
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bz, err := io.ReadAll(tr)
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if err != nil {
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return fmt.Errorf("failed to read chunk file: %w", err)
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}
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chunks <- io.NopCloser(bytes.NewReader(bz))
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}
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close(chunks)
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savedSnapshot := <-quitChan
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if savedSnapshot == nil {
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return errors.New("failed to save snapshot")
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}
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if !reflect.DeepEqual(&snapshot, savedSnapshot) {
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_ = snapshotStore.Delete(snapshot.Height, snapshot.Format)
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return errors.New("invalid archive, the saved snapshot is not equal to the original one")
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}
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return nil
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},
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}
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}
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