You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: signer_extraction_adapter.go
    path of file: ./repos/cosmos-sdk/types/mempool
    
    the code of the file until where you have to start completion: package mempool

import (
	"fmt"

	"cosmossdk.io/x/auth/signing"

	sdk "github.com/cosmos/cosmos-sdk/types"
)

// SignerData contains canonical useful information about the signer of a transaction
type SignerData struct {
	Signer   sdk.AccAddress
	Sequence uint64
}

// NewSignerData returns a n
    
func (DefaultSignerExtractionAdapter) GetSigners(tx sdk.Tx) ([]SignerData, error) {
	sigTx, ok := tx.(signing.SigVerifiableTx)
	if !ok {
		return nil, fmt.Errorf("tx of type %T does not implement SigVerifiableTx", tx)
	}

	sigs, err := sigTx.GetSignaturesV2()
	if err != nil {
		return nil, err
	}

	signers := make([]SignerData, len(sigs))
	for i, sig := range sigs {
		signers[i] = NewSignerData(
			sig.PubKey.Address().Bytes(),
			sig.Sequence,
		)
	}

	return signers, nil
}