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executed.go
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executed.go
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package procedure
import (
"errors"
"fmt"
"github.com/dgraph-io/badger/v2"
"github.com/onflow/flow-go/model/flow"
"github.com/onflow/flow-go/storage"
"github.com/onflow/flow-go/storage/badger/operation"
)
// UpdateHighestExecutedBlockIfHigher updates the latest executed block to be the input block
// if the input block has a greater height than the currently stored latest executed block.
// The executed block index must have been initialized before calling this function.
// Returns storage.ErrNotFound if the input block does not exist in storage.
func UpdateHighestExecutedBlockIfHigher(header *flow.Header) func(txn *badger.Txn) error {
return func(txn *badger.Txn) error {
var blockID flow.Identifier
err := operation.RetrieveExecutedBlock(&blockID)(txn)
if err != nil {
return fmt.Errorf("cannot lookup executed block: %w", err)
}
var highest flow.Header
err = operation.RetrieveHeader(blockID, &highest)(txn)
if err != nil {
return fmt.Errorf("cannot retrieve executed header: %w", err)
}
if header.Height <= highest.Height {
return nil
}
err = operation.UpdateExecutedBlock(header.ID())(txn)
if err != nil {
return fmt.Errorf("cannot update highest executed block: %w", err)
}
return nil
}
}
// GetHighestExecutedBlock retrieves the height and ID of the latest block executed by this node.
// Returns storage.ErrNotFound if no latest executed block has been stored.
func GetHighestExecutedBlock(height *uint64, blockID *flow.Identifier) func(tx *badger.Txn) error {
return func(tx *badger.Txn) error {
var highest flow.Header
err := operation.RetrieveExecutedBlock(blockID)(tx)
if err != nil {
return fmt.Errorf("could not lookup executed block %v: %w", blockID, err)
}
err = operation.RetrieveHeader(*blockID, &highest)(tx)
if err != nil {
if errors.Is(err, storage.ErrNotFound) {
return fmt.Errorf("unexpected: latest executed block does not exist in storage: %s", err.Error())
}
return fmt.Errorf("could not retrieve executed header %v: %w", blockID, err)
}
*height = highest.Height
return nil
}
}