func main() {
quit = make(chan bool)
update = make(chan *libovsdb.TableUpdates)
cache = make(map[string]map[string]libovsdb.Row)
// By default libovsdb connects to 127.0.0.0:6400.
ovs, err := libovsdb.Connect("", 0)
// If you prefer to connect to OVS in a specific location :
// ovs, err := libovsdb.Connect("192.168.56.101", 6640)
if err != nil {
fmt.Println("Unable to Connect ", err)
os.Exit(1)
}
var notifier Notifier
ovs.Register(notifier)
initial, _ := ovs.MonitorAll("Open_vSwitch", "")
populateCache(*initial)
fmt.Println(`Silly game of stopping this app when a Bridge with name "stop" is monitored !`)
go play(ovs)
<-quit
}
func (o *OvsMonitor) StartMonitoring() error {
ovsdb, err := libovsdb.Connect(o.Addr, o.Port)
if err != nil {
return err
}
o.OvsClient = &OvsClient{ovsdb: ovsdb}
notifier := Notifier{monitor: o}
ovsdb.Register(notifier)
requests := make(map[string]libovsdb.MonitorRequest)
err = o.setMonitorRequests("Bridge", &requests)
if err != nil {
return err
}
err = o.setMonitorRequests("Interface", &requests)
if err != nil {
return err
}
err = o.setMonitorRequests("Port", &requests)
if err != nil {
return err
}
updates, err := ovsdb.Monitor("Open_vSwitch", "", requests)
if err != nil {
return err
}
o.updateHandler(updates)
return nil
}
func NewDriver() (*Driver, error) {
docker, err := dockerclient.NewDockerClient("unix:///var/run/docker.sock", nil)
if err != nil {
return nil, fmt.Errorf("could not connect to docker: %s", err)
}
// initiate the ovsdb manager port binding
var ovsdb *libovsdb.OvsdbClient
retries := 3
for i := 0; i < retries; i++ {
ovsdb, err = libovsdb.Connect(localhost, ovsdbPort)
if err == nil {
break
}
log.Errorf("could not connect to openvswitch on port [ %d ]: %s. Retrying in 5 seconds", ovsdbPort, err)
time.Sleep(5 * time.Second)
}
if ovsdb == nil {
return nil, fmt.Errorf("could not connect to open vswitch")
}
d := &Driver{
dockerer: dockerer{
client: docker,
},
ovsdber: ovsdber{
ovsdb: ovsdb,
},
networks: make(map[string]*NetworkState),
}
// Initialize ovsdb cache at rpc connection setup
d.ovsdber.initDBCache()
return d, nil
}
func NewOpsManager(target string) (*OpsManager, error) {
ops, err := ovsdb.Connect("", 0)
if err != nil {
return nil, err
}
opsUpdateCh := make(chan *ovsdb.TableUpdates)
n := NewNotifier(opsUpdateCh)
ops.Register(n)
return &OpsManager{
ops: ops,
opsCh: make(chan *OpsOperation, 1024),
opsUpdateCh: opsUpdateCh,
bgpReady: false,
cache: make(map[string]map[string]ovsdb.Row),
target: target,
}, nil
}
func NewOpsManager(grpcCh chan *server.GrpcRequest) (*OpsManager, error) {
ops, err := ovsdb.Connect("", 0)
if err != nil {
return nil, err
}
gQueue := make([]*server.GrpcRequest, 0)
opsUpdateCh := make(chan *ovsdb.TableUpdates)
n := NewNotifier(opsUpdateCh)
ops.Register(n)
return &OpsManager{
ops: ops,
grpcCh: grpcCh,
opsCh: make(chan *OpsOperation, 1024),
opsUpdateCh: opsUpdateCh,
grpcQueue: gQueue,
bgpReady: false,
cache: make(map[string]map[string]ovsdb.Row),
}, nil
}
func New(version string, ctx *cli.Context) (Driver, error) {
docker, err := dockerclient.NewDockerClient("unix:///var/run/docker.sock", nil)
if err != nil {
return nil, fmt.Errorf("could not connect to docker: %s", err)
}
// initiate the ovsdb manager port binding
ovsdb, err := libovsdb.Connect(localhost, ovsdbPort)
if err != nil {
return nil, fmt.Errorf("could not connect to openvswitch on port [ %d ]: %s", ovsdbPort, err)
}
// bind user defined flags to the plugin config
if ctx.String("bridge-name") != "" {
bridgeName = ctx.String("bridge-name")
}
// lower bound of v4 MTU is 68-bytes per rfc791
if ctx.Int("mtu") >= minMTU {
defaultMTU = ctx.Int("mtu")
} else {
log.Fatalf("The MTU value passed [ %d ] must be greater then [ %d ] bytes per rfc791", ctx.Int("mtu"), minMTU)
}
// Parse the container subnet
containerGW, containerCidr, err := net.ParseCIDR(ctx.String("bridge-subnet"))
if err != nil {
log.Fatalf("Error parsing cidr from the subnet flag provided [ %s ]: %s", FlagBridgeSubnet, err)
}
// Update the cli.go global var with the network if user provided
bridgeSubnet = containerCidr.String()
switch ctx.String("mode") {
/* [ flat ] mode */
//Flat mode requires a gateway IP address is used just like any other
//normal L2 domain. If no gateway is specified, we attempt to guess using
//the first usable IP on the container subnet from the CLI argument.
//Example "192.168.1.0/24" we guess at a gatway of "192.168.1.1".
//Flat mode requires a bridge-subnet flag with a subnet from your existing network
case modeFlat:
ovsDriverMode = modeFlat
if ctx.String("gateway") != "" {
// bind the container gateway to the IP passed from the CLI
cliGateway := net.ParseIP(ctx.String("gateway"))
if cliGateway == nil {
log.Fatalf("The IP passed with the [ gateway ] flag [ %s ] was not a valid address: %s", FlagGateway.Value, err)
}
containerGW = cliGateway
} else {
// if no gateway was passed, guess the first valid address on the container subnet
containerGW = ipIncrement(containerGW)
}
/* [ nat ] mode */
//If creating a private network that will be NATed on the OVS bridge via IPTables
//it is not required to pass a subnet since in a single host scenario it is hidden
//from the network once it is masqueraded via IP tables.
case modeNAT, "":
ovsDriverMode = modeNAT
if ctx.String("gateway") != "" {
// bind the container gateway to the IP passed from the CLI
cliGateway := net.ParseIP(ctx.String("gateway"))
if cliGateway == nil {
log.Fatalf("The IP passed with the [ gateway ] flag [ %s ] was not a valid address: %s", FlagGateway.Value, err)
}
containerGW = cliGateway
} else {
// if no gateway was passed, guess the first valid address on the container subnet
containerGW = ipIncrement(containerGW)
}
default:
log.Fatalf("Invalid ovs mode supplied [ %s ]. The plugin currently supports two modes: [ %s ] or [ %s ]", ctx.String("mode"), modeFlat, modeNAT)
}
pluginOpts := &pluginConfig{
mtu: defaultMTU,
bridgeName: bridgeName,
mode: ovsDriverMode,
brSubnet: containerCidr,
gatewayIP: containerGW,
}
// Leaving as info for now. Change to debug eventually
log.Infof("Plugin configuration: \n %s", pluginOpts)
ipAllocator := ipallocator.New()
d := &driver{
dockerer: dockerer{
client: docker,
},
ovsdber: ovsdber{
ovsdb: ovsdb,
},
ipAllocator: ipAllocator,
pluginConfig: *pluginOpts,
version: version,
}
// Initialize ovsdb cache at rpc connection setup
d.ovsdber.initDBCache()
return d, nil
}
// Base on RFC 7047, empty condition should return all rows from a table. However,
// libovsdb does not seem to support that yet. This is the simplist, most common solution
// to it.
func noCondition() []interface{} {
return []interface{}{ovs.NewCondition("_uuid", "!=", ovs.UUID{GoUUID: "_"})}
}
func newCondition(column, function string, value interface{}) []interface{} {
return []interface{}{ovs.NewCondition(column, function, value)}
}
// Open creates a new Ovsdb connection.
// It's stored in a variable so we can mock it out for the unit tests.
var Open = func() (Client, error) {
client, err := ovs.Connect("127.0.0.1", 6640)
return Client{ovsdbClient{client}}, err
}
// Close destroys an Ovsdb connection created by Open.
func (ovsdb Client) Close() {
ovsdb.disconnect()
}
// CreateLogicalSwitch creates a new logical switch in OVN.
func (ovsdb Client) CreateLogicalSwitch(lswitch string) error {
check, err := ovsdb.transact("OVN_Northbound", ovs.Operation{
Op: "select",
Table: "Logical_Switch",
Where: newCondition("name", "==", lswitch),
})
// connect to database server using IP and Port
func Connect(ipAddr string, port int) (*libovsdb.OvsdbClient, error) {
return libovsdb.Connect(ipAddr, port)
}
