dial tcp: address tcp/%!d(string=5432): unknown port
OpError

type Response events.APIGatewayProxyResponse
var db *sql.DB

func init() {
    var err error
    db, err = sql.Open("postgres", fmt.Sprintf(
        "host=%s port=%d user=%s dbname=%s password=%s",
        os.Getenv("DB_HOST"),
        os.Getenv("DB_PORT"),
        os.Getenv("DB_USER"),
        os.Getenv("DB_NAME"),
        os.Getenv("DB_PASS"),
    ))
    if err != nil {
        fmt.Printf("Database connection booboo")
        panic(err)
    }
}