116 lines
3.2 KiB
Rust
116 lines
3.2 KiB
Rust
use crypto_helper::crypto::Crypto;
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use std::{time::Duration, cell::RefCell};
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extern crate rumqttc as mqtt;
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use serde::{Deserialize, Serialize};
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pub type TimeCallback = fn(u32) -> Result<(),()>;
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#[derive(Serialize, Deserialize, PartialEq)]
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enum MqttMessageKind {
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Time,
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Confirm,
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}
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#[derive(Serialize, Deserialize)]
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struct MqttMessage {
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id: uuid::Uuid,
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kind: MqttMessageKind,
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time: u32,
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}
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pub struct Comm {
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client: RefCell<mqtt::Client>,
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connection: RefCell<mqtt::Connection>,
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handler: TimeCallback,
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crypto: Crypto,
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topic: String,
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}
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impl Comm {
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pub fn new(
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broker_domain: &str,
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password: &str,
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handler: TimeCallback,
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) -> Result<Self, mqtt::ClientError> {
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let mut create_opts =
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mqtt::MqttOptions::new(uuid::Uuid::new_v4().to_string(), broker_domain, 8883);
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create_opts.set_keep_alive(Duration::from_secs(5));
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let transport = mqtt::Transport::Tls(mqtt::TlsConfiguration::default());
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create_opts.set_transport(transport);
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let (mut cli, conn) = mqtt::Client::new(create_opts, 10);
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let crypto = Crypto::new(password, broker_domain);
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let topic = format!("org.speedclimbing.ok-ready-go.{password}");
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let topic = Crypto::sha256(&crypto.encrypt(&topic));
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cli.subscribe(&topic, mqtt::QoS::AtMostOnce)?;
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Ok(Comm {
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client: RefCell::new(cli),
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connection: RefCell::new(conn),
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handler,
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crypto,
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topic,
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})
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}
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pub fn listen(&self) {
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for (_, notification) in self.connection.borrow_mut().iter().enumerate() {
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if let Err(e) = notification {
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println!("Error: {:?}", e);
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continue;
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}
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let notification = notification.unwrap();
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if let mqtt::Event::Outgoing(_) = notification {
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continue;
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}
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if let mqtt::Event::Incoming(notification) = notification {
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self._handle_incoming_packet(notification);
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}
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}
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}
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fn _handle_incoming_packet(&self, packet: mqtt::Packet) {
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match packet {
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mqtt::Packet::Publish(publish) => self._handle_publish_packet(publish),
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_ => return,
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}
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}
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fn _handle_publish_packet(&self, packet: mqtt::Publish) {
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if packet.topic != self.topic {
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return;
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}
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let msg = String::from_utf8(packet.payload.to_vec()).unwrap();
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let msg = self.crypto.decrypt(&msg);
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println!("Got: {}", msg);
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let msg: MqttMessage = serde_json::from_str(&msg).unwrap();
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if msg.kind != MqttMessageKind::Time {
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return;
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}
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if (self.handler)(msg.time).is_err() {
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println!("[WARN] error in time handler -> not sending confirmation");
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return;
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}
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let reply = MqttMessage {
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id: msg.id,
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kind: MqttMessageKind::Confirm,
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time: 0,
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};
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let reply = serde_json::to_string(&reply).unwrap();
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let reply = self.crypto.encrypt(&reply);
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self.client.borrow_mut()
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.publish(&self.topic, mqtt::QoS::AtMostOnce, false, reply.as_bytes())
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.unwrap();
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}
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}
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