1 // Copyright (c) 2019 Cisco and/or its affiliates.
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at:
7 // http://www.apache.org/licenses/LICENSE-2.0
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
29 "github.com/fsnotify/fsnotify"
30 "github.com/lunixbochs/struc"
31 logger "github.com/sirupsen/logrus"
33 "git.fd.io/govpp.git/adapter"
34 "git.fd.io/govpp.git/codec"
35 "git.fd.io/govpp.git/examples/binapi/memclnt"
39 // DefaultSocketName is default VPP API socket file name
40 DefaultSocketName = "/run/vpp-api.sock"
44 // DefaultConnectTimeout is default timeout for connecting
45 DefaultConnectTimeout = time.Second * 3
46 // DefaultDisconnectTimeout is default timeout for discconnecting
47 DefaultDisconnectTimeout = time.Second
48 // MaxWaitReady defines maximum duration before waiting for socket file
50 MaxWaitReady = time.Second * 15
51 // ClientName is used for identifying client in socket registration
52 ClientName = "govppsock"
56 // Debug is global variable that determines debug mode
57 Debug = os.Getenv("DEBUG_GOVPP_SOCK") != ""
58 // DebugMsgIds is global variable that determines debug mode for msg ids
59 DebugMsgIds = os.Getenv("DEBUG_GOVPP_SOCKMSG") != ""
61 Log = logger.New() // global logger
64 // init initializes global logger, which logs debug level messages to stdout.
68 Log.Level = logger.DebugLevel
72 type vppClient struct {
78 connectTimeout time.Duration
79 disconnectTimeout time.Duration
81 cb adapter.MsgCallback
83 msgTable map[string]uint16
91 func NewVppClient(sockAddr string) *vppClient {
93 sockAddr = DefaultSocketName
97 connectTimeout: DefaultConnectTimeout,
98 disconnectTimeout: DefaultDisconnectTimeout,
99 cb: func(msgID uint16, data []byte) {
100 Log.Warnf("no callback set, dropping message: ID=%v len=%d", msgID, len(data))
105 // SetConnectTimeout sets timeout used during connecting.
106 func (c *vppClient) SetConnectTimeout(t time.Duration) {
110 // SetDisconnectTimeout sets timeout used during disconnecting.
111 func (c *vppClient) SetDisconnectTimeout(t time.Duration) {
112 c.disconnectTimeout = t
115 // WaitReady checks socket file existence and waits for it if necessary
116 func (c *vppClient) WaitReady() error {
117 // check if file at the path already exists
118 if _, err := os.Stat(c.sockAddr); err == nil {
120 } else if os.IsExist(err) {
124 // if not, watch for it
125 watcher, err := fsnotify.NewWatcher()
130 if err := watcher.Close(); err != nil {
131 Log.Errorf("failed to close file watcher: %v", err)
135 // start watching directory
136 if err := watcher.Add(filepath.Dir(c.sockAddr)); err != nil {
142 case <-time.After(MaxWaitReady):
143 return fmt.Errorf("waiting for socket file timed out (%s)", MaxWaitReady)
144 case e := <-watcher.Errors:
146 case ev := <-watcher.Events:
147 Log.Debugf("watcher event: %+v", ev)
148 if ev.Name == c.sockAddr {
149 if (ev.Op & fsnotify.Create) == fsnotify.Create {
150 // socket was created, we are ready
158 func (c *vppClient) SetMsgCallback(cb adapter.MsgCallback) {
159 Log.Debug("SetMsgCallback")
163 func (c *vppClient) Connect() error {
164 Log.Debugf("Connecting to: %v", c.sockAddr)
166 if err := c.connect(c.sockAddr); err != nil {
170 if err := c.open(); err != nil {
174 c.quit = make(chan struct{})
181 func (c *vppClient) connect(sockAddr string) error {
182 addr := &net.UnixAddr{Name: sockAddr, Net: "unix"}
184 conn, err := net.DialUnix("unix", nil, addr)
186 // we try different type of socket for backwards compatbility with VPP<=19.04
187 if strings.Contains(err.Error(), "wrong type for socket") {
188 addr.Net = "unixpacket"
189 Log.Debugf("%s, retrying connect with type unixpacket", err)
190 conn, err = net.DialUnix("unixpacket", nil, addr)
193 Log.Debugf("Connecting to socket %s failed: %s", addr, err)
199 c.reader = bufio.NewReader(c.conn)
200 c.writer = bufio.NewWriter(c.conn)
202 Log.Debugf("Connected to socket: %v", addr)
208 sockCreateMsgId = 15 // hard-coded sockclnt_create message ID
209 createMsgContext = byte(123)
210 deleteMsgContext = byte(124)
213 func (c *vppClient) open() error {
214 msgCodec := new(codec.MsgCodec)
216 req := &memclnt.SockclntCreate{
217 Name: []byte(ClientName),
219 msg, err := msgCodec.EncodeMsg(req, sockCreateMsgId)
221 Log.Debugln("Encode error:", err)
225 msg[5] = createMsgContext
227 if err := c.write(msg); err != nil {
228 Log.Debugln("Write error: ", err)
232 readDeadline := time.Now().Add(c.connectTimeout)
233 if err := c.conn.SetReadDeadline(readDeadline); err != nil {
236 msgReply, err := c.read()
238 Log.Println("Read error:", err)
241 // reset read deadline
242 if err := c.conn.SetReadDeadline(time.Time{}); err != nil {
246 reply := new(memclnt.SockclntCreateReply)
247 if err := msgCodec.DecodeMsg(msgReply, reply); err != nil {
248 Log.Println("Decode error:", err)
252 Log.Debugf("SockclntCreateReply: Response=%v Index=%v Count=%v",
253 reply.Response, reply.Index, reply.Count)
255 c.clientIndex = reply.Index
256 c.msgTable = make(map[string]uint16, reply.Count)
257 for _, x := range reply.MessageTable {
258 name := string(bytes.TrimSuffix(bytes.Split(x.Name, []byte{0x00})[0], []byte{0x13}))
259 c.msgTable[name] = x.Index
260 if strings.HasPrefix(name, "sockclnt_delete_") {
261 c.sockDelMsgId = x.Index
264 Log.Debugf(" - %4d: %q", x.Index, name)
271 func (c *vppClient) Disconnect() error {
275 Log.Debugf("Disconnecting..")
279 // force readerLoop to timeout
280 if err := c.conn.SetReadDeadline(time.Now()); err != nil {
284 // wait for readerLoop to return
287 if err := c.close(); err != nil {
291 if err := c.conn.Close(); err != nil {
292 Log.Debugln("Closing socket failed:", err)
299 func (c *vppClient) close() error {
300 msgCodec := new(codec.MsgCodec)
302 req := &memclnt.SockclntDelete{
303 Index: c.clientIndex,
305 msg, err := msgCodec.EncodeMsg(req, c.sockDelMsgId)
307 Log.Debugln("Encode error:", err)
311 msg[5] = deleteMsgContext
313 Log.Debugf("sending socklntDel (%d byes): % 0X", len(msg), msg)
314 if err := c.write(msg); err != nil {
315 Log.Debugln("Write error: ", err)
319 readDeadline := time.Now().Add(c.disconnectTimeout)
320 if err := c.conn.SetReadDeadline(readDeadline); err != nil {
323 msgReply, err := c.read()
325 Log.Debugln("Read error:", err)
326 if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
327 // we accept timeout for reply
332 // reset read deadline
333 if err := c.conn.SetReadDeadline(time.Time{}); err != nil {
337 reply := new(memclnt.SockclntDeleteReply)
338 if err := msgCodec.DecodeMsg(msgReply, reply); err != nil {
339 Log.Debugln("Decode error:", err)
343 Log.Debugf("SockclntDeleteReply: Response=%v", reply.Response)
348 func (c *vppClient) GetMsgID(msgName string, msgCrc string) (uint16, error) {
349 msg := msgName + "_" + msgCrc
350 msgID, ok := c.msgTable[msg]
352 return 0, fmt.Errorf("unknown message: %q", msg)
357 type reqHeader struct {
363 func (c *vppClient) SendMsg(context uint32, data []byte) error {
365 ClientIndex: c.clientIndex,
368 buf := new(bytes.Buffer)
369 if err := struc.Pack(buf, h); err != nil {
372 copy(data[2:], buf.Bytes())
374 Log.Debugf("SendMsg (%d) context=%v client=%d: data: % 02X", len(data), context, c.clientIndex, data)
376 if err := c.write(data); err != nil {
377 Log.Debugln("write error: ", err)
384 func (c *vppClient) write(msg []byte) error {
386 DataLen: uint32(len(msg)),
388 buf := new(bytes.Buffer)
389 if err := struc.Pack(buf, h); err != nil {
392 header := buf.Bytes()
394 // we lock to prevent mixing multiple message sends
396 defer c.writeMu.Unlock()
398 if n, err := c.writer.Write(header); err != nil {
401 Log.Debugf(" - header sent (%d/%d): % 0X", n, len(header), header)
404 if err := c.writer.Flush(); err != nil {
408 for i := 0; i <= len(msg)/c.writer.Size(); i++ {
409 x := i*c.writer.Size() + c.writer.Size()
413 Log.Debugf("x=%v i=%v len=%v mod=%v", x, i, len(msg), len(msg)/c.writer.Size())
414 if n, err := c.writer.Write(msg[i*c.writer.Size() : x]); err != nil {
417 Log.Debugf(" - msg sent x=%d (%d/%d): % 0X", x, n, len(msg), msg)
419 if err := c.writer.Flush(); err != nil {
428 type msgHeader struct {
433 func (c *vppClient) readerLoop() {
435 defer Log.Debugf("reader quit")
445 if isClosedError(err) {
448 Log.Debugf("read failed: %v", err)
452 if err := struc.Unpack(bytes.NewReader(msg), h); err != nil {
453 Log.Debugf("unpacking header failed: %v", err)
457 Log.Debugf("recvMsg (%d) msgID=%d context=%v", len(msg), h.MsgID, h.Context)
462 type msgheader struct {
463 Q int `struc:"uint64"`
464 DataLen uint32 `struc:"uint32"`
465 GcMarkTimestamp uint32 `struc:"uint32"`
468 func (c *vppClient) read() ([]byte, error) {
469 Log.Debug("reading next msg..")
471 header := make([]byte, 16)
473 n, err := io.ReadAtLeast(c.reader, header, 16)
477 Log.Debugln("zero bytes header")
481 Log.Debugf("invalid header data (%d): % 0X", n, header[:n])
482 return nil, fmt.Errorf("invalid header (expected 16 bytes, got %d)", n)
484 Log.Debugf(" - read header %d bytes: % 0X", n, header)
487 if err := struc.Unpack(bytes.NewReader(header[:]), h); err != nil {
490 Log.Debugf(" - decoded header: %+v", h)
492 msgLen := int(h.DataLen)
493 msg := make([]byte, msgLen)
495 n, err = c.reader.Read(msg)
499 Log.Debugf(" - read msg %d bytes (%d buffered)", n, c.reader.Buffered())
503 Log.Debugf("continue read for another %d bytes", remain)
507 nbytes, err := c.reader.Read(view)
510 } else if nbytes == 0 {
511 return nil, fmt.Errorf("zero nbytes")
515 Log.Debugf("another data received: %d bytes (remain: %d)", nbytes, remain)
524 func isClosedError(err error) bool {
528 return strings.HasSuffix(err.Error(), "use of closed network connection")