Split client and server into modules

src/server/mod.rs

@@ -0,0 +1,58 @@
+use crate::message::{Message, MessageReader, MessageWriter};
+use anyhow::Result;
+use log::{error, warn};
+use tokio::io::{AsyncRead, AsyncWrite, AsyncWriteExt, BufReader, BufWriter};
+
+mod refresh;
+
+async fn server_main<Reader: AsyncRead + Unpin, Writer: AsyncWrite + Unpin>(
+    reader: &mut MessageReader<Reader>,
+    writer: &mut MessageWriter<Writer>,
+) -> Result<()> {
+    // The first message we send must be an announcement.
+    writer.write(Message::Hello(0, 1, vec![])).await?;
+
+    loop {
+        use Message::*;
+        match reader.read().await? {
+            Ping => (),
+            Refresh => {
+                let ports = match refresh::get_entries() {
+                    Ok(ports) => ports,
+                    Err(e) => {
+                        error!("Error scanning: {:?}", e);
+                        vec![]
+                    }
+                };
+                if let Err(e) = writer.write(Message::Ports(ports)).await {
+                    // Writer has been closed for some reason, we can just
+                    // quit.... I hope everything is OK?
+                    warn!("Warning: Error sending: {:?}", e);
+                }
+            }
+            message => panic!("Unsupported: {:?}", message),
+        };
+    }
+}
+
+pub async fn run_server() {
+    let reader = BufReader::new(tokio::io::stdin());
+    let mut writer = BufWriter::new(tokio::io::stdout());
+
+    // Write the 8-byte synchronization marker.
+    writer
+        .write_u64(0x00_00_00_00_00_00_00_00)
+        .await
+        .expect("Error writing marker");
+
+    if let Err(e) = writer.flush().await {
+        eprintln!("Error writing sync marker: {:?}", e);
+        return;
+    }
+
+    let mut writer = MessageWriter::new(writer);
+    let mut reader = MessageReader::new(reader);
+    if let Err(e) = server_main(&mut reader, &mut writer).await {
+        eprintln!("Error: {:?}", e);
+    }
+}