From deb1d7df4a3d81ec131087de2dfe07f458ecd6ea Mon Sep 17 00:00:00 2001
From: Alexander Baranov <baranovas@vtb.ru>
Date: Thu, 26 Feb 2026 00:34:46 +0300
Subject: [PATCH] homework: thermometer mock (not tested)

---
 smart-house/src/bin/power_socket_client.rs |  2 +-
 smart-house/src/bin/power_socket_mock.rs   |  3 +-
 smart-house/src/bin/stubs_example.rs       |  2 +-
 smart-house/src/bin/thermometer_mock.rs    | 65 +++++++++++++++++++---
 4 files changed, 62 insertions(+), 10 deletions(-)

diff --git a/smart-house/src/bin/power_socket_client.rs b/smart-house/src/bin/power_socket_client.rs
index 6608ca7..a9dc184 100644
--- a/smart-house/src/bin/power_socket_client.rs
+++ b/smart-house/src/bin/power_socket_client.rs
@@ -1,4 +1,4 @@
-/// Пример подключения нескольких клиентов к розетке. Изменение состояния любым из клиентов отражается на всех.
+//! Пример подключения нескольких клиентов к розетке. Изменение состояния любым из клиентов отражается на всех.
 
 use smart_house::PowerSocket;
 use std::time::Duration;
diff --git a/smart-house/src/bin/power_socket_mock.rs b/smart-house/src/bin/power_socket_mock.rs
index 27e062d..3c897eb 100644
--- a/smart-house/src/bin/power_socket_mock.rs
+++ b/smart-house/src/bin/power_socket_mock.rs
@@ -1,4 +1,5 @@
-/// Сервер-имитатор умной розетки
+//! Сервер-имитатор умной розетки
+
 use std::net::SocketAddr;
 use std::sync::{Arc, RwLock};
 use std::time::Duration;
diff --git a/smart-house/src/bin/stubs_example.rs b/smart-house/src/bin/stubs_example.rs
index bcaefa3..e168f12 100644
--- a/smart-house/src/bin/stubs_example.rs
+++ b/smart-house/src/bin/stubs_example.rs
@@ -1,4 +1,4 @@
-/// Старый пример работы умного дома на заглушках
+//! Старый пример работы умного дома на заглушках
 
 use smart_house::{Device, House, PowerSocket, PrintStatus, Room, Thermometer, room};
 
diff --git a/smart-house/src/bin/thermometer_mock.rs b/smart-house/src/bin/thermometer_mock.rs
index 9e3ca67..0794347 100644
--- a/smart-house/src/bin/thermometer_mock.rs
+++ b/smart-house/src/bin/thermometer_mock.rs
@@ -1,25 +1,76 @@
+//! Имитатор термометра
+
+use rand::prelude::*;
 use std::net::SocketAddr;
 use std::sync::{Arc, RwLock};
-use rand::prelude::*;
+use std::time::Duration;
 
 fn parse_args() -> Result<SocketAddr, Box<dyn std::error::Error>> {
     let mut args = std::env::args();
     args.next();
-    Ok(args.next().ok_or(std::io::Error::other("no server address parameter specified"))?.parse()?)
+    Ok(args
+        .next()
+        .ok_or(std::io::Error::other("no server address parameter must be specified"))?
+        .parse()?)
 }
+
 fn generate_temperature() -> f32 {
     rand::rng().random_range(18.0..23.0)
 }
 
 struct RealThermometer {
-    temperature: f32
+    temperature: f32,
+}
+
+const REQUEST: u8 = 0b01010101;
+
+async fn mutate_thermometer(thermometer: Arc<RwLock<RealThermometer>>) -> Result<(), std::io::Error> {
+    let mut interval = tokio::time::interval(Duration::from_secs(1));
+    loop {
+        interval.tick().await;
+        let new_temperature = generate_temperature();
+        thermometer.try_write().map_err(|_| std::io::Error::other("write lock failed"))?.temperature = new_temperature;
+        println!("new temperature: {:02.1}", new_temperature)
+    }
+}
+
+async fn handle_request(
+    request: u8,
+    thermometer: Arc<RwLock<RealThermometer>>,
+    socket: Arc<tokio::net::UdpSocket>,
+    addr: SocketAddr,
+) -> Result<(), std::io::Error> {
+    if request == REQUEST {
+        let data = thermometer
+            .try_read()
+            .map_err(|_| std::io::Error::other("write lock failed"))?
+            .temperature
+            .to_le_bytes();
+        socket.send_to(&data, &addr).await?;
+        println!("temperature was sent to {}", addr);
+    } else {
+        println!("invalid request: {:?}", request);
+    }
+    Ok(())
 }
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
-    let real_thermometer = Arc::new(RwLock::new(RealThermometer { temperature: generate_temperature()}));
+    let real_thermometer = Arc::new(RwLock::new(RealThermometer {
+        temperature: generate_temperature(),
+    }));
     let rt = tokio::runtime::Builder::new_current_thread().enable_all().build()?;
-    rt.block_on(async {
+    rt.block_on(async move {
+        let thermometer = real_thermometer.clone();
+        tokio::spawn(async move { mutate_thermometer(thermometer).await });
 
-    });
-    Ok(())
+        let socket = Arc::new(tokio::net::UdpSocket::bind(parse_args()?).await?);
+        let mut buf = [0u8; 4];
+        loop {
+            let (_, addr) = socket.recv_from(&mut buf).await?;
+            let request = buf[0];
+            let thermometer = real_thermometer.clone();
+            let socket = socket.clone();
+            tokio::spawn(async move { handle_request(request, thermometer, socket, addr).await });
+        }
+    })
 }