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