1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77

use log::trace;
use std::{
    io::{self, BufRead, BufReader, Write},
    net::TcpStream,
};

use crate::time::pomodoro::{Client, ClientStream, Request, Response, Timer};

pub struct TcpClient {
    pub host: String,
    pub port: u16,
}

impl TcpClient {
    pub fn new<H>(host: H, port: u16) -> Box<dyn Client>
    where
        H: ToString,
    {
        Box::new(Self {
            host: host.to_string(),
            port,
        })
    }
}

impl ClientStream<TcpStream> for TcpClient {
    fn read(&self, stream: &TcpStream) -> io::Result<Response> {
        let mut reader = BufReader::new(stream);
        let mut res = String::new();
        reader.read_line(&mut res).unwrap();

        trace!("response: {res:?}");

        let mut tokens = res.trim().split_whitespace();
        match tokens.next() {
            Some("ok") => Ok(Response::Ok),
            Some("timer") => match tokens.next().map(serde_json::from_str::<Timer>) {
                Some(Ok(timer)) => Ok(Response::Timer(timer)),
                Some(Err(err)) => Err(io::Error::new(
                    io::ErrorKind::InvalidInput,
                    format!("invalid timer: {err}"),
                )),
                None => Err(io::Error::new(
                    io::ErrorKind::InvalidInput,
                    format!("missing timer"),
                )),
            },
            Some(res) => Err(io::Error::new(
                io::ErrorKind::InvalidInput,
                format!("invalid response: {res}"),
            )),
            None => Err(io::Error::new(
                io::ErrorKind::InvalidInput,
                format!("missing response"),
            )),
        }
    }

    fn write(&self, stream: &mut TcpStream, req: Request) -> io::Result<()> {
        let req = match req {
            Request::Start => String::from("start"),
            Request::Get => String::from("get"),
            Request::Pause => String::from("pause"),
            Request::Resume => String::from("resume"),
            Request::Stop => String::from("stop"),
        };
        stream.write_all((req + "\n").as_bytes())?;
        Ok(())
    }
}

impl Client for TcpClient {
    fn send(&self, req: Request) -> io::Result<Response> {
        let mut stream = TcpStream::connect((self.host.as_str(), self.port))?;
        self.handle(&mut stream, req)
    }
}