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grpc_server.go
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/
grpc_server.go
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/***
Copyright 2019 Cisco Systems Inc. All rights reserved.
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 gbpserver
import (
"fmt"
"golang.org/x/net/context"
"net"
"strings"
"github.com/sirupsen/logrus"
"google.golang.org/grpc"
"google.golang.org/grpc/peer"
)
const (
inboxSize = 256
)
// gbpWatch implements the GBPServer interface
type gbpWatch struct {
log *logrus.Entry
gs *Server
l net.Listener
stopped bool
}
func StartGRPC(port string, gs *Server) (*gbpWatch, error) {
logger := logrus.New()
log := logger.WithField("mod", "GRPC-S")
lis, err := net.Listen("tcp", port)
if err != nil {
return nil, err
}
log.Infof("Listening on %s", port)
s := grpc.NewServer()
gw := &gbpWatch{log: log, gs: gs, l: lis}
RegisterGBPServer(s, gw)
go func() {
if err := s.Serve(lis); err != nil {
if !gw.stopped {
log.Fatalf("Failed to serve - %v", err)
}
}
if !gw.stopped {
log.Fatalf("grpc server exited")
}
}()
return gw, nil
}
func (gw *gbpWatch) Stop() {
gw.stopped = true
gw.l.Close()
}
// ListObjects is the list-watch streaming method invoked by the client.
// It blocks after each send, until a new operation is avaialable to send
func (gw *gbpWatch) ListObjects(v *Version, ss GBP_ListObjectsServer) error {
// extract peer ip from context
peer, ok := peer.FromContext(ss.Context())
if !ok {
gw.log.Errorf("Peer information unavailable")
return fmt.Errorf("Peer information unavailable")
}
gw.log.Debugf("peerAddr %s", peer.Addr.String())
peerVtep := strings.Split(peer.Addr.String(), ":")[0]
gw.log.Infof("ListObjects from %s", peerVtep)
inbox := make(chan *GBPOperation, inboxSize)
updateFn := func(op GBPOperation_OpCode, urls []string) {
var moList []*GBPObject
for _, url := range urls {
if strings.Contains(url, "InvRemoteInventoryEp") {
moList = append(moList, getInvSubTree(url, peerVtep)...)
} else if len(url) > 1 { // skip topRoot
moList = append(moList, getMoSubTree(url)...)
}
}
if len(moList) == 0 {
gw.log.Debugf("grpc: Nothing to send to %s", peerVtep)
return
}
gw.log.Debugf("Sending to %s URIs: %+v", peerVtep, urls)
gbpOp := &GBPOperation{
Opcode: op,
ObjectList: moList,
}
inbox <- gbpOp
}
// get a snapshot of current MoDB, and register a callback for changes
gMutex.Lock()
objList := getSnapShot(peerVtep)
gw.gs.RegisterCallBack(peer.Addr.String(), updateFn)
gMutex.Unlock()
// send the snapshot
gbpOp := &GBPOperation{
Opcode: GBPOperation_REPLACE,
ObjectList: objList,
}
ss.Send(gbpOp)
// pick up updates from inbox and send
for {
select {
case gbpOp = <-inbox:
ss.Send(gbpOp)
case <-ss.Context().Done():
gMutex.Lock()
gw.gs.RemoveCallBack(peer.Addr.String())
gMutex.Unlock()
gw.log.Infof("ListObjects Exit %s", peerVtep)
return ss.Context().Err()
}
}
}
// Lists VTEPs known to the gbp server per the remote registry
func (gw *gbpWatch) ListVTEPs(ctx context.Context, in *EmptyMsg) (*VTEPList, error) {
return &VTEPList{
Vteps: getVteps(),
}, nil
}
// Gets a snapshot of policy for a node specified its vtep
func (gw *gbpWatch) GetSnapShot(ctx context.Context, in *VTEP) (*ObjectList, error) {
objList := getSnapShot(in.Vtep)
return &ObjectList{
MoList: objList,
}, nil
}