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: db.go
    path of file: ./repos/steampipe/pkg/constants
    
    the code of the file until where you have to start completion: package constants

import (
	"fmt"
)

// Client constants
const (
	// MaxParallelClientInits is the number of clients to initializ
    
func (i Invoker) IsValid() error {
	switch i {
	case InvokerService, InvokerQuery, InvokerCheck, InvokerPlugin, InvokerDashboard:
		return nil
	}
	return fmt.Errorf("invalid invoker. Can be one of '%v', '%v', '%v', '%v' or '%v' ", InvokerService, InvokerQuery, InvokerPlugin, InvokerCheck, InvokerDashboard)
}