From c0f90386900f0f767c7d0569e0f758d305af3d09 Mon Sep 17 00:00:00 2001
From: metamuffin <yvchraiqi@protonmail.com>
Date: Wed, 17 Aug 2022 17:49:31 +0200
Subject: Revert "Revert "modularize interfaces""

This reverts commit c10e88e42b26637e3c48ed781ced1382fb20fa26.
---
 karld/src/interface/unix.rs | 77 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 karld/src/interface/unix.rs

(limited to 'karld/src/interface/unix.rs')

diff --git a/karld/src/interface/unix.rs b/karld/src/interface/unix.rs
new file mode 100644
index 0000000..8d038d4
--- /dev/null
+++ b/karld/src/interface/unix.rs
@@ -0,0 +1,77 @@
+use crate::{handle_packet, CLIENT_ID_COUNTER};
+use karlcommon::{socket_path, version, ClientboundPacket, ProtoError, ServerboundPacket};
+use log::{debug, error, info, warn};
+use std::io;
+use std::io::{BufRead, BufReader, ErrorKind, Write};
+use std::os::unix::net::{UnixListener, UnixStream};
+use std::thread;
+
+pub fn run() {
+    if socket_path().exists() {
+        info!("remove old socket");
+        std::fs::remove_file(socket_path()).unwrap();
+    }
+    let listener = UnixListener::bind(socket_path()).unwrap();
+    info!("listening.");
+
+    loop {
+        let (stream, addr) = listener.accept().unwrap();
+        let id = CLIENT_ID_COUNTER.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
+        thread::spawn(move || {
+            info!("client connected: {:?}", addr);
+            if let Err(err) = handle_connection(id, stream) {
+                warn!("client dropped: {:?} ({})", addr, err);
+            } else {
+                info!("client dropped: {:?}", addr);
+            }
+        });
+    }
+}
+
+fn handle_connection(id: u32, mut stream: UnixStream) -> io::Result<()> {
+    let mut reader = BufReader::new(stream.try_clone()?);
+    let (responder, responses) = crossbeam_channel::unbounded();
+    responder
+        .send(ClientboundPacket::Handshake {
+            version: version!(),
+        })
+        .unwrap();
+    thread::spawn(move || {
+        for m in responses {
+            debug!("{id} -> {m:?}");
+            match stream
+                .write_fmt(format_args!("{}\n", serde_json::to_string(&m).unwrap()))
+                .map_err(|e| e.kind())
+            {
+                Ok(_) => (),
+                Err(ErrorKind::BrokenPipe) => break,
+                Err(e) => error!("network error: {:?}", e),
+            }
+        }
+    });
+    {
+        let mut buf = String::new();
+        loop {
+            if reader.read_line(&mut buf)? == 0 {
+                break Ok(());
+            };
+            match serde_json::from_str::<ServerboundPacket>(buf.as_str()) {
+                Ok(packet) => {
+                    debug!("{id} <- {packet:?}");
+                    handle_packet(id, packet, responder.clone());
+                }
+                Err(err) => {
+                    warn!("client error: {:?}", &err);
+                    responder
+                        .send(ClientboundPacket::Error(ProtoError::FormatError(format!(
+                            "{}",
+                            &err
+                        ))))
+                        .map_err(|_| io::Error::from(ErrorKind::InvalidInput))?
+                }
+            }
+
+            buf.clear();
+        }
+    }
+}
-- 
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