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ofnetMaster.go
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ofnetMaster.go
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/***
Copyright 2014 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 ofnet
// This file contains the ofnet master implementation
import (
"fmt"
"net"
"net/rpc"
"time"
"github.com/contiv/ofnet/rpcHub"
log "github.com/Sirupsen/logrus"
)
// Ofnet master state
type OfnetMaster struct {
rpcServer *rpc.Server // json-rpc server
rpcListener net.Listener // Listener
// Database of agent nodes
agentDb map[string]*OfnetNode
// Endpoint database
endpointDb map[string]*OfnetEndpoint
}
// Create new Ofnet master
func NewOfnetMaster(portNo uint16) *OfnetMaster {
// Create the master
master := new(OfnetMaster)
// Init params
master.agentDb = make(map[string]*OfnetNode)
master.endpointDb = make(map[string]*OfnetEndpoint)
// Create a new RPC server
master.rpcServer, master.rpcListener = rpcHub.NewRpcServer(portNo)
// Register RPC handler
err := master.rpcServer.Register(master)
if err != nil {
log.Fatalf("Error Registering RPC callbacks. Err: %v", err)
return nil
}
return master
}
// Delete closes rpc listener
func (self *OfnetMaster) Delete() error {
self.rpcListener.Close()
time.Sleep(100 * time.Millisecond)
return nil
}
// Register an agent
func (self *OfnetMaster) RegisterNode(hostInfo *OfnetNode, ret *bool) error {
// Create a node
node := new(OfnetNode)
node.HostAddr = hostInfo.HostAddr
node.HostPort = hostInfo.HostPort
hostKey := fmt.Sprintf("%s:%d", hostInfo.HostAddr, hostInfo.HostPort)
// Add it to DB
self.agentDb[hostKey] = node
log.Infof("Registered node: %+v", node)
// Send all existing endpoints to the new node
for _, endpoint := range self.endpointDb {
if node.HostAddr != endpoint.OriginatorIp.String() {
var resp bool
log.Infof("Sending endpoint: %+v to node %s", endpoint, node.HostAddr)
client := rpcHub.Client(node.HostAddr, node.HostPort)
err := client.Call("OfnetAgent.EndpointAdd", endpoint, &resp)
if err != nil {
log.Errorf("Error adding endpoint to %s. Err: %v", node.HostAddr, err)
}
}
}
return nil
}
// Add an Endpoint
func (self *OfnetMaster) EndpointAdd(ep *OfnetEndpoint, ret *bool) error {
// Check if we have the endpoint already and which is more recent
oldEp := self.endpointDb[ep.EndpointID]
if oldEp != nil {
// If old endpoint has more recent timestamp, nothing to do
if !ep.Timestamp.After(oldEp.Timestamp) {
return nil
}
}
// Save the endpoint in DB
self.endpointDb[ep.EndpointID] = ep
// Publish it to all agents except where it came from
for _, node := range self.agentDb {
if node.HostAddr != ep.OriginatorIp.String() {
var resp bool
log.Infof("Sending endpoint: %+v to node %s", ep, node.HostAddr)
client := rpcHub.Client(node.HostAddr, node.HostPort)
err := client.Call("OfnetAgent.EndpointAdd", ep, &resp)
if err != nil {
log.Errorf("Error adding endpoint to %s. Err: %v", node.HostAddr, err)
return err
}
}
}
*ret = true
return nil
}
// Delete an Endpoint
func (self *OfnetMaster) EndpointDel(ep *OfnetEndpoint, ret *bool) error {
// Check if we have the endpoint, if we dont have the endpoint, nothing to do
oldEp := self.endpointDb[ep.EndpointID]
if oldEp == nil {
return nil
}
// If existing endpoint has more recent timestamp, nothing to do
if oldEp.Timestamp.After(ep.Timestamp) {
return nil
}
// Delete the endpoint from DB
delete(self.endpointDb, ep.EndpointID)
// Publish it to all agents except where it came from
for _, node := range self.agentDb {
if node.HostAddr != ep.OriginatorIp.String() {
var resp bool
log.Infof("Sending DELETE endpoint: %+v to node %s", ep, node.HostAddr)
client := rpcHub.Client(node.HostAddr, node.HostPort)
err := client.Call("OfnetAgent.EndpointDel", ep, &resp)
if err != nil {
log.Errorf("Error sending DELERE endpoint to %s. Err: %v", node.HostAddr, err)
return err
}
}
}
*ret = true
return nil
}
// Make a dummy RPC call to all agents. for testing purposes..
func (self *OfnetMaster) MakeDummyRpcCall() error {
// Publish it to all agents except where it came from
for _, node := range self.agentDb {
var resp bool
dummyArg := "dummy string"
log.Infof("Making dummy rpc call to node %+v", node)
client := rpcHub.Client(node.HostAddr, node.HostPort)
err := client.Call("OfnetAgent.DummyRpc", &dummyArg, &resp)
if err != nil {
log.Errorf("Error making dummy rpc call to %+v. Err: %v", node, err)
return err
}
}
return nil
}