refactor(irtt-client): modularize client components

crates/irtt-client/src/socket.rs

@@ -0,0 +1,103 @@
+use std::{
+    net::{SocketAddr, ToSocketAddrs, UdpSocket},
+    time::Duration,
+};
+
+use socket2::{Domain, Protocol, Socket, Type};
+
+use crate::{
+    config::{ClientConfig, SocketConfig, DEFAULT_PORT, MIN_OPEN_TIMEOUT},
+    error::ClientError,
+};
+
+pub(crate) fn validate_open_timeouts(timeouts: &[Duration]) -> Result<(), ClientError> {
+    for timeout in timeouts {
+        if *timeout < MIN_OPEN_TIMEOUT {
+            return Err(ClientError::OpenTimeoutTooSmall {
+                timeout: *timeout,
+                minimum: MIN_OPEN_TIMEOUT,
+            });
+        }
+    }
+    Ok(())
+}
+
+pub(crate) fn resolve_remote(config: &ClientConfig) -> Result<SocketAddr, ClientError> {
+    let addr = normalize_server_addr(&config.server_addr);
+    let mut addrs = addr
+        .to_socket_addrs()
+        .map_err(|_| ClientError::Resolve { addr: addr.clone() })?;
+    addrs
+        .find(|addr| {
+            (!config.socket_config.ipv4_only || addr.is_ipv4())
+                && (!config.socket_config.ipv6_only || addr.is_ipv6())
+        })
+        .ok_or(ClientError::Resolve { addr })
+}
+
+pub(crate) fn normalize_server_addr(addr: &str) -> String {
+    if addr.parse::<SocketAddr>().is_ok() {
+        return addr.to_owned();
+    }
+    if addr.starts_with('[') {
+        return addr.to_owned();
+    }
+    if addr.parse::<std::net::Ipv6Addr>().is_ok() {
+        return format!("[{addr}]:{DEFAULT_PORT}");
+    }
+    if addr
+        .rsplit_once(':')
+        .is_some_and(|(_, port)| port.parse::<u16>().is_ok())
+    {
+        return addr.to_owned();
+    }
+    format!("{addr}:{DEFAULT_PORT}")
+}
+
+pub(crate) fn connect_udp_socket(
+    config: &SocketConfig,
+    remote: SocketAddr,
+) -> Result<UdpSocket, ClientError> {
+    let domain = if remote.is_ipv4() {
+        Domain::IPV4
+    } else {
+        Domain::IPV6
+    };
+    let socket = Socket::new(domain, Type::DGRAM, Some(Protocol::UDP))?;
+
+    if config.ipv6_only && remote.is_ipv6() {
+        socket.set_only_v6(true)?;
+    }
+    if let Some(ttl) = config.ttl {
+        socket.set_ttl(ttl)?;
+    }
+
+    let bind_addr = config.bind_addr.unwrap_or_else(|| {
+        if remote.is_ipv4() {
+            SocketAddr::from(([0, 0, 0, 0], 0))
+        } else {
+            SocketAddr::from(([0_u16; 8], 0))
+        }
+    });
+    socket.bind(&bind_addr.into())?;
+    socket.connect(&remote.into())?;
+
+    let socket: UdpSocket = socket.into();
+    socket.set_read_timeout(config.recv_timeout)?;
+    Ok(socket)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn normalize_server_addr_adds_default_ports() {
+        assert_eq!(normalize_server_addr("127.0.0.1"), "127.0.0.1:2112");
+        assert_eq!(normalize_server_addr("127.0.0.1:1234"), "127.0.0.1:1234");
+        assert_eq!(normalize_server_addr("localhost"), "localhost:2112");
+        assert_eq!(normalize_server_addr("localhost:1234"), "localhost:1234");
+        assert_eq!(normalize_server_addr("::1"), "[::1]:2112");
+        assert_eq!(normalize_server_addr("[::1]:1234"), "[::1]:1234");
+    }
+}