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: secret_creds.go
    path of file: ./repos/goldfish/vendor/github.com/hashicorp/vault/builtin/logical/database
    
    the code of the file until where you have to start completion: package database

import (
	"fmt"

	"github.com/hashicorp/vault/logical"
	"github.com/hashicorp/vault/logical/framework"
)

const SecretCredsType = "creds"

func secretCreds(b *databaseBackend) *framework.Secret {
	return &framework.Secret{
		Type:   SecretCredsType,
		Fields: map[string]*framework.FieldSchema{},

		Renew:  b.secretCredsRenew(),
		Revoke: b.secretCredsRevoke(),
	}
}

func (b *databaseBackend) secretCredsRenew() framework.OperationFunc {
	return func(req *logical.Request, data *framework.FieldData) (*logical.Response, error) {
		// Get the username from the internal data
		usernameRaw, ok := req.Secret.InternalData["username"]
		if !ok {
			return nil, fmt.Errorf("secret is missing username internal data")
		}
		username, ok := usernameRaw.(string)

		roleNameRaw, ok := req.Secret.InternalData["role"]
		if !ok {
			return nil, fmt.Errorf("could not find role with name: %s", req.Secret.InternalData["role"])
		}

		role, err := b.Role(req.Storage, roleNameRaw.(string))
		if err != nil {
			return nil, err
		}
		if role == nil {
			return nil, fmt.Errorf("error during renew: could not find role with name %s", req.Secret.InternalData["role"])
		}

		f := framework.LeaseExtend(role.DefaultTTL, role.MaxTTL, b.System())
		resp, err := f(req, data)
		if err != nil {
			return nil, err
		}

		// Grab the read lock
		b.RLock()
		var unlockFunc func() = b.RUnlock

		// Get the Database object
		db, ok := b.getDBObj(rol
    
func (b *databaseBackend) secretCredsRenew() framework.OperationFunc {
	return func(req *logical.Request, data *framework.FieldData) (*logical.Response, error) {
		// Get the username from the internal data
		usernameRaw, ok := req.Secret.InternalData["username"]
		if !ok {
			return nil, fmt.Errorf("secret is missing username internal data")
		}
		username, ok := usernameRaw.(string)

		roleNameRaw, ok := req.Secret.InternalData["role"]
		if !ok {
			return nil, fmt.Errorf("could not find role with name: %s", req.Secret.InternalData["role"])
		}

		role, err := b.Role(req.Storage, roleNameRaw.(string))
		if err != nil {
			return nil, err
		}
		if role == nil {
			return nil, fmt.Errorf("error during renew: could not find role with name %s", req.Secret.InternalData["role"])
		}

		f := framework.LeaseExtend(role.DefaultTTL, role.MaxTTL, b.System())
		resp, err := f(req, data)
		if err != nil {
			return nil, err
		}

		// Grab the read lock
		b.RLock()
		var unlockFunc func() = b.RUnlock

		// Get the Database object
		db, ok := b.getDBObj(role.DBName)
		if !ok {
			// Upgrade lock
			b.RUnlock()
			b.Lock()
			unlockFunc = b.Unlock

			// Create a new DB object
			db, err = b.createDBObj(req.Storage, role.DBName)
			if err != nil {
				unlockFunc()
				return nil, fmt.Errorf("cound not retrieve db with name: %s, got error: %s", role.DBName, err)
			}
		}

		// Make sure we increase the VALID UNTIL endpoint for this user.
		if expireTime := resp.Secret.ExpirationTime(); !expireTime.IsZero() {
			err := db.RenewUser(role.Statements, username, expireTime)
			// Unlock
			unlockFunc()
			if err != nil {
				b.closeIfShutdown(role.DBName, err)
				return nil, err
			}
		}

		return resp, nil
	}
}