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 path.
40 DefaultSocketName = adapter.DefaultBinapiSocket
44 // DefaultConnectTimeout is default timeout for connecting
45 DefaultConnectTimeout = time.Second * 3
46 // DefaultDisconnectTimeout is default timeout for discconnecting
47 DefaultDisconnectTimeout = time.Millisecond * 100
48 // MaxWaitReady defines maximum duration before waiting for socket file
50 MaxWaitReady = time.Second * 10
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 is global logger
65 // init initializes global logger, which logs debug level messages to stdout.
69 Log.Level = logger.DebugLevel
70 Log.Debug("govpp/socketclient: enabled debug mode")
74 type vppClient struct {
81 connectTimeout time.Duration
82 disconnectTimeout time.Duration
84 cb adapter.MsgCallback
86 msgTable map[string]uint16
94 func NewVppClient(sockAddr string) *vppClient {
96 sockAddr = DefaultSocketName
100 connectTimeout: DefaultConnectTimeout,
101 disconnectTimeout: DefaultDisconnectTimeout,
102 cb: func(msgID uint16, data []byte) {
103 Log.Warnf("no callback set, dropping message: ID=%v len=%d", msgID, len(data))
108 // SetConnectTimeout sets timeout used during connecting.
109 func (c *vppClient) SetConnectTimeout(t time.Duration) {
113 // SetDisconnectTimeout sets timeout used during disconnecting.
114 func (c *vppClient) SetDisconnectTimeout(t time.Duration) {
115 c.disconnectTimeout = t
118 // WaitReady checks socket file existence and waits for it if necessary
119 func (c *vppClient) WaitReady() error {
120 // check if socket already exists
121 if _, err := os.Stat(c.sockAddr); err == nil {
122 return nil // socket exists, we are ready
123 } else if !os.IsNotExist(err) {
124 return err // some other error occurred
127 // socket does not exist, watch for it
128 watcher, err := fsnotify.NewWatcher()
133 if err := watcher.Close(); err != nil {
134 Log.Warnf("failed to close file watcher: %v", err)
138 // start directory watcher
139 if err := watcher.Add(filepath.Dir(c.sockAddr)); err != nil {
143 timeout := time.NewTimer(MaxWaitReady)
147 return fmt.Errorf("timeout waiting (%s) for socket file: %s", MaxWaitReady, c.sockAddr)
149 case e := <-watcher.Errors:
152 case ev := <-watcher.Events:
153 Log.Debugf("watcher event: %+v", ev)
154 if ev.Name == c.sockAddr && (ev.Op&fsnotify.Create) == fsnotify.Create {
155 // socket created, we are ready
162 func (c *vppClient) SetMsgCallback(cb adapter.MsgCallback) {
163 Log.Debug("SetMsgCallback")
167 func (c *vppClient) Connect() error {
168 Log.Debugf("Connecting to: %v", c.sockAddr)
170 if err := c.connect(c.sockAddr); err != nil {
174 if err := c.open(); err != nil {
179 c.quit = make(chan struct{})
186 func (c *vppClient) Disconnect() error {
190 Log.Debugf("Disconnecting..")
194 if err := c.conn.CloseRead(); err != nil {
195 Log.Debugf("closing read failed: %v", err)
198 // wait for readerLoop to return
201 if err := c.close(); err != nil {
202 Log.Debugf("closing failed: %v", err)
205 if err := c.disconnect(); err != nil {
212 func (c *vppClient) connect(sockAddr string) error {
213 addr := &net.UnixAddr{Name: sockAddr, Net: "unix"}
215 conn, err := net.DialUnix("unix", nil, addr)
217 // we try different type of socket for backwards compatbility with VPP<=19.04
218 if strings.Contains(err.Error(), "wrong type for socket") {
219 addr.Net = "unixpacket"
220 Log.Warnf("%s, retrying connect with type unixpacket", err)
221 conn, err = net.DialUnix("unixpacket", nil, addr)
224 Log.Debugf("Connecting to socket %s failed: %s", addr, err)
230 Log.Debugf("Connected to socket (local addr: %v)", c.conn.LocalAddr().(*net.UnixAddr))
232 c.reader = bufio.NewReader(c.conn)
233 c.writer = bufio.NewWriter(c.conn)
238 func (c *vppClient) disconnect() error {
239 Log.Debugf("Closing socket")
240 if err := c.conn.Close(); err != nil {
241 Log.Debugln("Closing socket failed:", err)
248 sockCreateMsgId = 15 // hard-coded sockclnt_create message ID
249 createMsgContext = byte(123)
250 deleteMsgContext = byte(124)
253 func (c *vppClient) open() error {
254 msgCodec := new(codec.MsgCodec)
256 req := &memclnt.SockclntCreate{
257 Name: []byte(ClientName),
259 msg, err := msgCodec.EncodeMsg(req, sockCreateMsgId)
261 Log.Debugln("Encode error:", err)
265 msg[5] = createMsgContext
267 if err := c.write(msg); err != nil {
268 Log.Debugln("Write error: ", err)
272 readDeadline := time.Now().Add(c.connectTimeout)
273 if err := c.conn.SetReadDeadline(readDeadline); err != nil {
276 msgReply, err := c.read()
278 Log.Println("Read error:", err)
281 // reset read deadline
282 if err := c.conn.SetReadDeadline(time.Time{}); err != nil {
286 reply := new(memclnt.SockclntCreateReply)
287 if err := msgCodec.DecodeMsg(msgReply, reply); err != nil {
288 Log.Println("Decode error:", err)
292 Log.Debugf("SockclntCreateReply: Response=%v Index=%v Count=%v",
293 reply.Response, reply.Index, reply.Count)
295 c.clientIndex = reply.Index
296 c.msgTable = make(map[string]uint16, reply.Count)
297 for _, x := range reply.MessageTable {
298 name := string(bytes.TrimSuffix(bytes.Split(x.Name, []byte{0x00})[0], []byte{0x13}))
299 c.msgTable[name] = x.Index
300 if strings.HasPrefix(name, "sockclnt_delete_") {
301 c.sockDelMsgId = x.Index
304 Log.Debugf(" - %4d: %q", x.Index, name)
311 func (c *vppClient) close() error {
312 msgCodec := new(codec.MsgCodec)
314 req := &memclnt.SockclntDelete{
315 Index: c.clientIndex,
317 msg, err := msgCodec.EncodeMsg(req, c.sockDelMsgId)
319 Log.Debugln("Encode error:", err)
323 msg[5] = deleteMsgContext
325 Log.Debugf("sending socklntDel (%d byes): % 0X", len(msg), msg)
326 if err := c.write(msg); err != nil {
327 Log.Debugln("Write error: ", err)
331 readDeadline := time.Now().Add(c.disconnectTimeout)
332 if err := c.conn.SetReadDeadline(readDeadline); err != nil {
335 msgReply, err := c.read()
337 Log.Debugln("Read error:", err)
338 if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
339 // we accept timeout for reply
344 // reset read deadline
345 if err := c.conn.SetReadDeadline(time.Time{}); err != nil {
349 reply := new(memclnt.SockclntDeleteReply)
350 if err := msgCodec.DecodeMsg(msgReply, reply); err != nil {
351 Log.Debugln("Decode error:", err)
355 Log.Debugf("SockclntDeleteReply: Response=%v", reply.Response)
360 func (c *vppClient) GetMsgID(msgName string, msgCrc string) (uint16, error) {
361 msg := msgName + "_" + msgCrc
362 msgID, ok := c.msgTable[msg]
364 return 0, fmt.Errorf("unknown message: %q", msg)
369 type reqHeader struct {
375 func (c *vppClient) SendMsg(context uint32, data []byte) error {
377 ClientIndex: c.clientIndex,
380 buf := new(bytes.Buffer)
381 if err := struc.Pack(buf, h); err != nil {
384 copy(data[2:], buf.Bytes())
386 Log.Debugf("sendMsg (%d) context=%v client=%d: data: % 02X", len(data), context, c.clientIndex, data)
388 if err := c.write(data); err != nil {
389 Log.Debugln("write error: ", err)
396 func (c *vppClient) write(msg []byte) error {
398 DataLen: uint32(len(msg)),
400 buf := new(bytes.Buffer)
401 if err := struc.Pack(buf, h); err != nil {
404 header := buf.Bytes()
406 // we lock to prevent mixing multiple message sends
408 defer c.writeMu.Unlock()
410 if n, err := c.writer.Write(header); err != nil {
413 Log.Debugf(" - header sent (%d/%d): % 0X", n, len(header), header)
416 writerSize := c.writer.Size()
417 for i := 0; i <= len(msg)/writerSize; i++ {
418 x := i*writerSize + writerSize
422 Log.Debugf(" - x=%v i=%v len=%v mod=%v", x, i, len(msg), len(msg)/writerSize)
423 if n, err := c.writer.Write(msg[i*writerSize : x]); err != nil {
426 Log.Debugf(" - msg sent x=%d (%d/%d): % 0X", x, n, len(msg), msg)
429 if err := c.writer.Flush(); err != nil {
433 Log.Debugf(" -- write done")
438 type msgHeader struct {
443 func (c *vppClient) readerLoop() {
445 defer Log.Debugf("reader quit")
456 if isClosedError(err) {
459 Log.Debugf("read failed: %v", err)
464 if err := struc.Unpack(bytes.NewReader(msg), h); err != nil {
465 Log.Debugf("unpacking header failed: %v", err)
469 Log.Debugf("recvMsg (%d) msgID=%d context=%v", len(msg), h.MsgID, h.Context)
474 type msgheader struct {
475 Q int `struc:"uint64"`
476 DataLen uint32 `struc:"uint32"`
477 GcMarkTimestamp uint32 `struc:"uint32"`
480 func (c *vppClient) read() ([]byte, error) {
481 Log.Debug(" reading next msg..")
483 header := make([]byte, 16)
485 n, err := io.ReadAtLeast(c.reader, header, 16)
490 Log.Debugln("zero bytes header")
493 Log.Debugf("invalid header data (%d): % 0X", n, header[:n])
494 return nil, fmt.Errorf("invalid header (expected 16 bytes, got %d)", n)
496 Log.Debugf(" read header %d bytes: % 0X", n, header)
499 if err := struc.Unpack(bytes.NewReader(header[:]), h); err != nil {
502 Log.Debugf(" - decoded header: %+v", h)
504 msgLen := int(h.DataLen)
505 msg := make([]byte, msgLen)
507 n, err = c.reader.Read(msg)
511 Log.Debugf(" - read msg %d bytes (%d buffered) % 0X", n, c.reader.Buffered(), msg[:n])
515 Log.Debugf("continue read for another %d bytes", remain)
519 nbytes, err := c.reader.Read(view)
522 } else if nbytes == 0 {
523 return nil, fmt.Errorf("zero nbytes")
527 Log.Debugf("another data received: %d bytes (remain: %d)", nbytes, remain)
533 Log.Debugf(" -- read done (buffered: %d)", c.reader.Buffered())
538 func isClosedError(err error) bool {
542 return strings.HasSuffix(err.Error(), "use of closed network connection")