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processor.go
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/
processor.go
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/*
* Cherry - An OpenFlow Controller
*
* Copyright (C) 2015 Samjung Data Service, Inc. All rights reserved.
* Kitae Kim <superkkt@sds.co.kr>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package app
import (
"fmt"
"github.com/superkkt/cherry/network"
"github.com/superkkt/cherry/openflow"
"github.com/superkkt/cherry/protocol"
)
// Processor should prepare to be executed by multiple goroutines simultaneously.
type Processor interface {
Dependencies() []string
fmt.Stringer
Init() error
// Name returns the application name that is globally unique
Name() string
network.EventListener
Next() (next Processor, ok bool)
SetNext(Processor)
}
type BaseProcessor struct {
next Processor
}
func (r *BaseProcessor) Init() error {
return nil
}
func (r *BaseProcessor) Name() string {
return "BaseProcessor"
}
func (r *BaseProcessor) Dependencies() []string {
return []string{}
}
func (r *BaseProcessor) OnPacketIn(finder network.Finder, ingress *network.Port, eth *protocol.Ethernet) error {
// Do nothging and execute the next processor if it exists
next, ok := r.Next()
if !ok {
return nil
}
return next.OnPacketIn(finder, ingress, eth)
}
func (r *BaseProcessor) OnDeviceUp(finder network.Finder, device *network.Device) error {
// Do nothging and execute the next processor if it exists
next, ok := r.Next()
if !ok {
return nil
}
return next.OnDeviceUp(finder, device)
}
func (r *BaseProcessor) OnDeviceDown(finder network.Finder, device *network.Device) error {
// Do nothging and execute the next processor if it exists
next, ok := r.Next()
if !ok {
return nil
}
return next.OnDeviceDown(finder, device)
}
func (r *BaseProcessor) OnPortUp(finder network.Finder, port *network.Port) error {
// Do nothging and execute the next processor if it exists
next, ok := r.Next()
if !ok {
return nil
}
return next.OnPortUp(finder, port)
}
func (r *BaseProcessor) OnPortDown(finder network.Finder, port *network.Port) error {
// Do nothging and execute the next processor if it exists
next, ok := r.Next()
if !ok {
return nil
}
return next.OnPortDown(finder, port)
}
func (r *BaseProcessor) OnTopologyChange(finder network.Finder) error {
// Do nothging and execute the next processor if it exists
next, ok := r.Next()
if !ok {
return nil
}
return next.OnTopologyChange(finder)
}
func (r *BaseProcessor) OnFlowRemoved(finder network.Finder, flow openflow.FlowRemoved) error {
// Do nothging and execute the next processor if it exists
next, ok := r.Next()
if !ok {
return nil
}
return next.OnFlowRemoved(finder, flow)
}
func (r *BaseProcessor) Next() (next Processor, ok bool) {
if r.next != nil {
return r.next, true
}
return nil, false
}
func (r *BaseProcessor) SetNext(next Processor) {
r.next = next
}
func (r *BaseProcessor) PacketOut(egress *network.Port, packet []byte) error {
f := egress.Device().Factory()
inPort := openflow.NewInPort()
inPort.SetController()
outPort := openflow.NewOutPort()
outPort.SetValue(egress.Number())
action, err := f.NewAction()
if err != nil {
return err
}
action.SetOutPort(outPort)
out, err := f.NewPacketOut()
if err != nil {
return err
}
out.SetInPort(inPort)
out.SetAction(action)
out.SetData(packet)
return egress.Device().SendMessage(out)
}