make future IO working both on go and llgo

x/socketio/socketio_go.go

@@ -0,0 +1,92 @@
+//go:build !llgo
+// +build !llgo
+
+/*
+ * Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package socketio
+
+import (
+	"net"
+
+	"github.com/goplus/llgo/x/async"
+	"github.com/goplus/llgo/x/tuple"
+)
+
+type Conn struct {
+	conn net.Conn
+}
+
+func Listen(protocol, bindAddr string, listenCb func(client *Conn, err error)) {
+	go func() {
+		listener, err := net.Listen(protocol, bindAddr)
+		if err != nil {
+			listenCb(nil, err)
+			return
+		}
+		for {
+			conn, err := listener.Accept()
+			if err != nil {
+				listenCb(nil, err)
+				return
+			}
+			listenCb(&Conn{conn: conn}, nil)
+		}
+	}()
+}
+
+func Connect(network, addr string) async.Future[tuple.Tuple2[*Conn, error]] {
+	return async.Async(func(resolve func(tuple.Tuple2[*Conn, error])) {
+		go func() {
+			conn, err := net.Dial(network, addr)
+			if err != nil {
+				resolve(tuple.T2[*Conn, error](nil, err))
+				return
+			}
+			resolve(tuple.T2[*Conn, error](&Conn{conn: conn}, nil))
+		}()
+	})
+}
+
+// Read once from the TCP connection.
+func (t *Conn) Read() async.Future[tuple.Tuple2[[]byte, error]] {
+	return async.Async(func(resolve func(tuple.Tuple2[[]byte, error])) {
+		go func() {
+			buf := make([]byte, 1024)
+			n, err := t.conn.Read(buf)
+			if err != nil {
+				resolve(tuple.T2[[]byte, error](nil, err))
+				return
+			}
+			resolve(tuple.T2[[]byte, error](buf[:n], nil))
+		}()
+	})
+}
+
+func (t *Conn) Write(data []byte) async.Future[error] {
+	return async.Async(func(resolve func(error)) {
+		go func() {
+			_, err := t.conn.Write(data)
+			resolve(err)
+		}()
+	})
+}
+
+func (t *Conn) Close() {
+	if t.conn != nil {
+		t.conn.Close()
+	}
+}