Refactor conduit type from pinecone demo into its own package

cmd/dendrite-demo-pinecone/conduit/conduit.go

@@ -0,0 +1,84 @@
+// Copyright 2023 The Matrix.org Foundation C.I.C.
+//
+// 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 conduit
+
+import (
+	"io"
+	"net"
+	"sync"
+
+	"github.com/matrix-org/pinecone/types"
+	"go.uber.org/atomic"
+)
+
+type Conduit struct {
+	closed    atomic.Bool
+	conn      net.Conn
+	portMutex sync.Mutex
+	port      types.SwitchPortID
+}
+
+func NewConduit(conn net.Conn, port int) Conduit {
+	return Conduit{
+		conn: conn,
+		port: types.SwitchPortID(port),
+	}
+}
+
+func (c *Conduit) Port() int {
+	c.portMutex.Lock()
+	defer c.portMutex.Unlock()
+	return int(c.port)
+}
+
+func (c *Conduit) SetPort(port types.SwitchPortID) {
+	c.portMutex.Lock()
+	defer c.portMutex.Unlock()
+	c.port = port
+}
+
+func (c *Conduit) Read(b []byte) (int, error) {
+	if c.closed.Load() {
+		return 0, io.EOF
+	}
+	return c.conn.Read(b)
+}
+
+func (c *Conduit) ReadCopy() ([]byte, error) {
+	if c.closed.Load() {
+		return nil, io.EOF
+	}
+	var buf [65535 * 2]byte
+	n, err := c.conn.Read(buf[:])
+	if err != nil {
+		return nil, err
+	}
+	return buf[:n], nil
+}
+
+func (c *Conduit) Write(b []byte) (int, error) {
+	if c.closed.Load() {
+		return 0, io.EOF
+	}
+	return c.conn.Write(b)
+}
+
+func (c *Conduit) Close() error {
+	if c.closed.Load() {
+		return io.ErrClosedPipe
+	}
+	c.closed.Store(true)
+	return c.conn.Close()
+}