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watch_vppcalls.go
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watch_vppcalls.go
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// Copyright (c) 2019 Cisco and/or its affiliates.
//
// 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 vpp2001_379
import (
"net"
"os"
"strings"
"time"
govppapi "git.fd.io/govpp.git/api"
"github.com/pkg/errors"
vpp_dhcp "github.com/ligato/vpp-agent/plugins/vpp/binapi/vpp2001_379/dhcp"
vpp_ifs "github.com/ligato/vpp-agent/plugins/vpp/binapi/vpp2001_379/interfaces"
"github.com/ligato/vpp-agent/plugins/vpp/ifplugin/vppcalls"
)
var InterfaceEventTimeout = time.Second
func (h *InterfaceVppHandler) WatchInterfaceEvents(events chan<- *vppcalls.InterfaceEvent) error {
notifChan := make(chan govppapi.Message, 10)
// subscribe for receiving SwInterfaceEvents notifications
vppNotifSubs, err := h.callsChannel.SubscribeNotification(notifChan, &vpp_ifs.SwInterfaceEvent{})
if err != nil {
return errors.Errorf("failed to subscribe VPP notification (sw_interface_event): %v", err)
}
_ = vppNotifSubs
go func() {
for {
select {
case e, ok := <-notifChan:
if !ok {
h.log.Debugf("interface notification channel was closed")
return
}
ifEvent, ok := e.(*vpp_ifs.SwInterfaceEvent)
if !ok {
continue
}
event := &vppcalls.InterfaceEvent{
SwIfIndex: uint32(ifEvent.SwIfIndex),
AdminState: boolToUint(ifEvent.Flags > 0),
LinkState: boolToUint(ifEvent.Flags > 1),
Deleted: ifEvent.Deleted,
}
// send event in goroutine for quick processing
go func() {
select {
case events <- event:
// sent ok
case <-time.After(InterfaceEventTimeout):
h.log.Warnf("unable to deliver interface event, dropping it")
}
}()
}
}
}()
// enable interface state notifications from VPP
wantIfEventsReply := &vpp_ifs.WantInterfaceEventsReply{}
err = h.callsChannel.SendRequest(&vpp_ifs.WantInterfaceEvents{
PID: uint32(os.Getpid()),
EnableDisable: 1,
}).ReceiveReply(wantIfEventsReply)
if err != nil {
if err == govppapi.VPPApiError(govppapi.INVALID_REGISTRATION) {
h.log.Warnf("already registered for watch interface events: %v", err)
return nil
}
return errors.Errorf("failed to watch interface events: %v", err)
}
return nil
}
func (h *InterfaceVppHandler) WatchDHCPLeases(leasesCh chan<- *vppcalls.Lease) error {
notifChan := make(chan govppapi.Message)
// subscribe for receiving SwInterfaceEvents notifications
vppNotifSubs, err := h.callsChannel.SubscribeNotification(notifChan, &vpp_dhcp.DHCPComplEvent{})
if err != nil {
return errors.Errorf("failed to subscribe VPP notification (sw_interface_event): %v", err)
}
_ = vppNotifSubs
go func() {
for {
select {
case e := <-notifChan:
dhcpEvent, ok := e.(*vpp_dhcp.DHCPComplEvent)
if !ok {
continue
}
lease := dhcpEvent.Lease
leasesCh <- &vppcalls.Lease{
SwIfIndex: uint32(lease.SwIfIndex),
State: uint8(lease.State),
Hostname: strings.TrimRight(lease.Hostname, "\x00"),
IsIPv6: lease.IsIPv6,
HostAddress: dhcpAddressToString(lease.HostAddress, uint32(lease.MaskWidth), lease.IsIPv6),
RouterAddress: dhcpAddressToString(lease.RouterAddress, uint32(lease.MaskWidth), lease.IsIPv6),
HostMac: net.HardwareAddr(lease.HostMac[:]).String(),
}
}
}
}()
return nil
}