Enum Message
pub enum Message {
NewOrder {
order_id: u64,
side: Side,
order_type: OrderType,
time_in_force: TimeInForce,
price: i64,
quantity: u64,
},
CancelOrder {
order_id: u64,
},
Heartbeat,
ExecutionReport {
sequence: u64,
order_id: u64,
status: u8,
fill_count: u32,
remaining_quantity: u64,
last_fill_price: i64,
last_fill_quantity: u64,
},
}