net: fix TcpConn.peer_ip/0 to only return the ip address, without the port number (#21831)

vlib/net/tcp.c.v

@@ -297,7 +297,15 @@ pub fn (c &TcpConn) peer_addr() !Addr {
 
 // peer_ip retrieves the ip address used by the peer, and returns it as a string
 pub fn (c &TcpConn) peer_ip() !string {
-	return c.peer_addr()!.str()
+	address := c.peer_addr()!.str()
+	if address.contains(']:') {
+		// ipv6 addresses similar to this: '[::1]:46098'
+		ip := address.all_before(']:').all_after('[')
+		return ip
+	}
+	// ipv4 addresses similar to '127.0.0.1:7346'
+	ip := address.all_before(':')
+	return ip
 }
 
 pub fn (c &TcpConn) addr() !Addr {

vlib/net/tcp_simple_client_server_test.v

@@ -64,6 +64,10 @@ fn test_socket() {
 
 fn test_socket_write_and_read() {
 	mut server, mut client, mut socket := setup()
+	addr := socket.peer_addr()!
+	ip := socket.peer_ip()!
+	assert ip in ['::1', 'localhost', '127.0.0.1']
+	println('> ip: ${ip} | addr: ${addr}')
 	defer {
 		cleanup(mut server, mut client, mut socket)
 	}

vlib/net/tcp_test.v

@@ -35,6 +35,9 @@ fn echo(address string) ! {
 
 	println('local: ' + c.addr()!.str())
 	println(' peer: ' + c.peer_addr()!.str())
+	ip := c.peer_ip()!
+	println('   ip: ${ip}')
+	assert ip in ['::1', 'localhost', '127.0.0.1']
 
 	data := 'Hello from vlib/net!'
 	c.write_string(data)!