logger "github.com/sirupsen/logrus"
)
+var ReplyChannelTimeout = time.Millisecond * 100
+
var (
ErrNotConnected = errors.New("not connected to VPP, ignoring the request")
ErrProbeTimeout = errors.New("probe reply not received within timeout period")
)
// watchRequests watches for requests on the request API channel and forwards them as messages to VPP.
-func (c *Connection) watchRequests(ch *channel) {
+func (c *Connection) watchRequests(ch *Channel) {
for {
select {
case req, ok := <-ch.reqChan:
c.releaseAPIChannel(ch)
return
}
- c.processRequest(ch, req)
-
- case req := <-ch.notifSubsChan:
- // new request on the notification subscribe channel
- c.processSubscriptionRequest(ch, req)
+ if err := c.processRequest(ch, req); err != nil {
+ sendReplyError(ch, req, err)
+ }
}
}
}
// processRequest processes a single request received on the request channel.
-func (c *Connection) processRequest(ch *channel, req *vppRequest) error {
+func (c *Connection) processRequest(ch *Channel, req *vppRequest) error {
// check whether we are connected to VPP
- if atomic.LoadUint32(&c.connected) == 0 {
+ if atomic.LoadUint32(&c.vppConnected) == 0 {
err := ErrNotConnected
log.Errorf("processing request failed: %v", err)
- sendReplyError(ch, req, err)
return err
}
// retrieve message ID
msgID, err := c.GetMessageID(req.msg)
if err != nil {
- err = fmt.Errorf("unable to retrieve message ID: %v", err)
log.WithFields(logger.Fields{
"msg_name": req.msg.GetMessageName(),
"msg_crc": req.msg.GetCrcString(),
"seq_num": req.seqNum,
- }).Error(err)
- sendReplyError(ch, req, err)
- return err
+ "error": err,
+ }).Errorf("failed to retrieve message ID")
+ return fmt.Errorf("unable to retrieve message ID: %v", err)
}
// encode the message into binary
data, err := c.codec.EncodeMsg(req.msg, msgID)
if err != nil {
- err = fmt.Errorf("unable to encode the messge: %v", err)
log.WithFields(logger.Fields{
"channel": ch.id,
"msg_id": msgID,
"msg_name": req.msg.GetMessageName(),
"seq_num": req.seqNum,
- }).Error(err)
- sendReplyError(ch, req, err)
- return err
+ "error": err,
+ }).Errorf("failed to encode message: %#v", req.msg)
+ return fmt.Errorf("unable to encode the message: %v", err)
}
- // get context
context := packRequestContext(ch.id, req.multi, req.seqNum)
+
if log.Level == logger.DebugLevel { // for performance reasons - logrus does some processing even if debugs are disabled
log.WithFields(logger.Fields{
"channel": ch.id,
"context": context,
"is_multi": req.multi,
"msg_id": msgID,
- "msg_name": req.msg.GetMessageName(),
"msg_size": len(data),
"seq_num": req.seqNum,
- }).Debug(" -> Sending a message to VPP.")
+ "msg_crc": req.msg.GetCrcString(),
+ }).Debugf("==> govpp send: %s: %+v", req.msg.GetMessageName(), req.msg)
}
// send the request to VPP
- err = c.vpp.SendMsg(context, data)
+ err = c.vppClient.SendMsg(context, data)
if err != nil {
err = fmt.Errorf("unable to send the message: %v", err)
log.WithFields(logger.Fields{
"msg_id": msgID,
"seq_num": req.seqNum,
}).Error(err)
- sendReplyError(ch, req, err)
return err
}
if req.multi {
// send a control ping to determine end of the multipart response
- pingData, _ := c.codec.EncodeMsg(msgControlPing, c.pingReqID)
+ pingData, _ := c.codec.EncodeMsg(c.msgControlPing, c.pingReqID)
log.WithFields(logger.Fields{
"channel": ch.id,
"msg_id": c.pingReqID,
"msg_size": len(pingData),
"seq_num": req.seqNum,
- }).Debug(" -> Sending a control ping to VPP.")
+ }).Debug("--> sending control ping")
- if err := c.vpp.SendMsg(context, pingData); err != nil {
+ if err := c.vppClient.SendMsg(context, pingData); err != nil {
log.WithFields(logger.Fields{
"context": context,
"msg_id": msgID,
}
// msgCallback is called whenever any binary API message comes from VPP.
-func (c *Connection) msgCallback(msgID uint16, context uint32, data []byte) {
- connLock.RLock()
- defer connLock.RUnlock()
-
+func (c *Connection) msgCallback(msgID uint16, data []byte) {
if c == nil {
log.Warn("Already disconnected, ignoring the message.")
return
// - replies that don't have context as first field (comes as zero)
// - events that don't have context at all (comes as non zero)
//
- msgContext, err := c.codec.DecodeMsgContext(data, msg)
- if err == nil {
- if context != msgContext {
- log.Debugf("different context was decoded from message (%d -> %d)", context, msgContext)
- context = msgContext
- }
- } else {
+ context, err := c.codec.DecodeMsgContext(data, msg)
+ if err != nil {
log.Errorf("decoding context failed: %v", err)
}
log.WithFields(logger.Fields{
"context": context,
"msg_id": msgID,
- "msg_name": msg.GetMessageName(),
"msg_size": len(data),
"channel": chanID,
"is_multi": isMulti,
"seq_num": seqNum,
- }).Debug(" <- Received a message from VPP.")
+ "msg_crc": msg.GetCrcString(),
+ }).Debugf("<== govpp recv: %s", msg.GetMessageName())
}
if context == 0 || c.isNotificationMessage(msgID) {
// treat this as a last part of the reply
lastReplyReceived := isMulti && msgID == c.pingReplyID
- // send the data to the channel
+ // send the data to the channel, it needs to be copied,
+ // because it will be freed after this function returns
sendReply(ch, &vppReply{
msgID: msgID,
seqNum: seqNum,
- data: data,
+ data: append([]byte(nil), data...),
lastReceived: lastReplyReceived,
})
// sendReply sends the reply into the go channel, if it cannot be completed without blocking, otherwise
// it logs the error and do not send the message.
-func sendReply(ch *channel, reply *vppReply) {
+func sendReply(ch *Channel, reply *vppReply) {
select {
case ch.replyChan <- reply:
// reply sent successfully
- case <-time.After(time.Millisecond * 100):
+ case <-time.After(ReplyChannelTimeout):
// receiver still not ready
log.WithFields(logger.Fields{
"channel": ch,
}
}
-func sendReplyError(ch *channel, req *vppRequest, err error) {
+func sendReplyError(ch *Channel, req *vppRequest, err error) {
sendReply(ch, &vppReply{seqNum: req.seqNum, err: err})
}
+// isNotificationMessage returns true if someone has subscribed to provided message ID.
+func (c *Connection) isNotificationMessage(msgID uint16) bool {
+ c.subscriptionsLock.RLock()
+ defer c.subscriptionsLock.RUnlock()
+
+ _, exists := c.subscriptions[msgID]
+ return exists
+}
+
+// sendNotifications send a notification message to all subscribers subscribed for that message.
+func (c *Connection) sendNotifications(msgID uint16, data []byte) {
+ c.subscriptionsLock.RLock()
+ defer c.subscriptionsLock.RUnlock()
+
+ matched := false
+
+ // send to notification to each subscriber
+ for _, sub := range c.subscriptions[msgID] {
+ log.WithFields(logger.Fields{
+ "msg_name": sub.event.GetMessageName(),
+ "msg_id": msgID,
+ "msg_size": len(data),
+ }).Debug("Sending a notification to the subscription channel.")
+
+ event := sub.msgFactory()
+ if err := c.codec.DecodeMsg(data, event); err != nil {
+ log.WithFields(logger.Fields{
+ "msg_name": sub.event.GetMessageName(),
+ "msg_id": msgID,
+ "msg_size": len(data),
+ }).Errorf("Unable to decode the notification message: %v", err)
+ continue
+ }
+
+ // send the message into the go channel of the subscription
+ select {
+ case sub.notifChan <- event:
+ // message sent successfully
+ default:
+ // unable to write into the channel without blocking
+ log.WithFields(logger.Fields{
+ "msg_name": sub.event.GetMessageName(),
+ "msg_id": msgID,
+ "msg_size": len(data),
+ }).Warn("Unable to deliver the notification, reciever end not ready.")
+ }
+
+ matched = true
+ }
+
+ if !matched {
+ log.WithFields(logger.Fields{
+ "msg_id": msgID,
+ "msg_size": len(data),
+ }).Info("No subscription found for the notification message.")
+ }
+}
+
// +------------------+-------------------+-----------------------+
// | 15b = channel ID | 1b = is multipart | 16b = sequence number |
// +------------------+-------------------+-----------------------+
Code Review / govpp.git / blobdiff