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73 lines
2.2 KiB
73 lines
2.2 KiB
package commands
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import (
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"fmt"
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"github.com/spf13/cobra"
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dbm "github.com/tendermint/tm-db"
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cfg "github.com/tendermint/tendermint/config"
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"github.com/tendermint/tendermint/state"
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"github.com/tendermint/tendermint/store"
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)
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var RollbackStateCmd = &cobra.Command{
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Use: "rollback",
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Short: "rollback tendermint state by one height",
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Long: `
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A state rollback is performed to recover from an incorrect application state transition,
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when Tendermint has persisted an incorrect app hash and is thus unable to make
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progress. Rollback overwrites a state at height n with the state at height n - 1.
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The application should also roll back to height n - 1. No blocks are removed, so upon
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restarting Tendermint the transactions in block n will be re-executed against the
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application.
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`,
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RunE: func(cmd *cobra.Command, args []string) error {
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height, hash, err := RollbackState(config)
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if err != nil {
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return fmt.Errorf("failed to rollback state: %w", err)
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}
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fmt.Printf("Rolled back state to height %d and hash %v", height, hash)
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return nil
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},
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}
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// RollbackState takes the state at the current height n and overwrites it with the state
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// at height n - 1. Note state here refers to tendermint state not application state.
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// Returns the latest state height and app hash alongside an error if there was one.
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func RollbackState(config *cfg.Config) (int64, []byte, error) {
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// use the parsed config to load the block and state store
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blockStore, stateStore, err := loadStateAndBlockStore(config)
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if err != nil {
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return -1, nil, err
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}
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defer func() {
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_ = blockStore.Close()
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_ = stateStore.Close()
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}()
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// rollback the last state
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return state.Rollback(blockStore, stateStore)
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}
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func loadStateAndBlockStore(config *cfg.Config) (*store.BlockStore, state.Store, error) {
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dbType := dbm.BackendType(config.DBBackend)
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// Get BlockStore
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blockStoreDB, err := dbm.NewDB("blockstore", dbType, config.DBDir())
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if err != nil {
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return nil, nil, err
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}
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blockStore := store.NewBlockStore(blockStoreDB)
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// Get StateStore
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stateDB, err := dbm.NewDB("state", dbType, config.DBDir())
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if err != nil {
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return nil, nil, err
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}
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stateStore := state.NewStore(stateDB)
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return blockStore, stateStore, nil
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}
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