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order_tracker.rs
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order_tracker.rs
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use tokio::sync::{mpsc, oneshot};
use std::collections::HashMap;
#[derive(Debug, Clone)]
pub enum Order {
BUY(String, f32),
GET
}
pub struct TrackerMessage {
pub command: Order,
pub respond_to: oneshot::Sender<String >
}
pub struct GetTrackerActor {
pub sender: mpsc::Sender<TrackerMessage>
}
impl GetTrackerActor {
pub async fn send(self) -> String {
println!("GET function firing");
let (send, recv) = oneshot::channel();
let tracker_message = TrackerMessage {
command: Order::GET,
respond_to: send,
};
let _ = self.sender.send(tracker_message).await;
match recv.await {
Ok(outcome) => return outcome,
Err(e) => panic!("{}", e)
}
}
}
pub struct TrackerActor {
pub receiver: mpsc::Receiver<TrackerMessage>,
pub db: HashMap<String, f32>
}
impl TrackerActor {
pub fn new(receiver: mpsc::Receiver<TrackerMessage>) -> Self {
Self { receiver, db: HashMap::new() }
}
fn send_state(&self, respond_to: oneshot::Sender<String>) {
let mut buffer = Vec::new();
for key in self.db.keys() {
let amount = self.db.get(key).unwrap();
buffer.push(format!("{}: {};", &key, amount));
}
buffer.push("\n".to_string());
println!("sending state: {}", buffer.join(""));
let _ = respond_to.send(buffer.join(""));
}
fn handle_message(&mut self, message: TrackerMessage) {
match message.command {
Order::BUY(ticker, amount) => {
match self.db.get(ticker.as_str()) {
None => self.db.insert(ticker, amount),
Some(val) => self.db.insert(ticker, amount + val)
};
println!("db: {:?}", self.db);
}
Order::GET => {
println!("getting state");
self.send_state(message.respond_to);
}
};
}
pub async fn run(mut self) {
println!("tracker actor is running");
while let Some(msg) = self.receiver.recv().await {
self.handle_message(msg);
}
}
}