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node.go
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node.go
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package controller
import (
"fmt"
"time"
"github.com/kandoo/beehive/Godeps/_workspace/src/github.com/golang/glog"
bh "github.com/kandoo/beehive"
"github.com/kandoo/beehive-netctrl/nom"
)
type nodeConnectedHandler struct{}
func (h nodeConnectedHandler) Rcv(msg bh.Msg, ctx bh.RcvContext) error {
nc := msg.Data().(nom.NodeConnected)
ddict := ctx.Dict(driversDict)
k := string(nc.Node.ID)
n := nodeDrivers{
Node: nc.Node,
}
if v, err := ddict.Get(k); err == nil {
n = v.(nodeDrivers)
}
if _, ok := n.driver(nc.Driver); ok {
return fmt.Errorf("driver %v reconnects to %v", nc.Driver, n.Node)
}
gdict := ctx.Dict(genDict)
gen := uint64(0)
if v, err := gdict.Get("gen"); err == nil {
gen = v.(uint64)
}
gen++
db := nc.Driver.BeeID
if len(n.Drivers) == 0 {
nc.Driver.Role = nom.DriverRoleMaster
ctx.Emit(nom.NodeJoined(nc.Node))
glog.V(2).Infof("%v connected to master controller", nc.Node)
} else {
nc.Driver.Role = nom.DriverRoleSlave
glog.V(2).Infof("%v connected to slave controller", nc.Node)
}
n.Drivers = append(n.Drivers, driverInfo{
Driver: nc.Driver,
LastSeen: time.Now(),
})
ctx.SendToBee(nom.ChangeDriverRole{
Node: nc.Node.UID(),
Role: nc.Driver.Role,
Generation: gen,
}, db)
gdict.Put("gen", gen)
return ddict.Put(k, n)
}
func (h nodeConnectedHandler) Map(msg bh.Msg,
ctx bh.MapContext) bh.MappedCells {
nc := msg.Data().(nom.NodeConnected)
return bh.MappedCells{{driversDict, string(nc.Node.ID)}}
}
type nodeDisconnectedHandler struct{}
func (h nodeDisconnectedHandler) Rcv(msg bh.Msg, ctx bh.RcvContext) error {
dc := msg.Data().(nom.NodeDisconnected)
d := ctx.Dict(driversDict)
k := string(dc.Node.ID)
v, err := d.Get(k)
if err != nil {
return fmt.Errorf("driver %v disconnects from %v before connecting",
dc.Driver, dc.Node)
}
nd := v.(nodeDrivers)
ndd, ok := nd.driver(dc.Driver)
if !ok {
return fmt.Errorf("driver %v disconnects from %v before connecting",
dc.Driver, dc.Node)
}
nd.removeDriver(dc.Driver)
if len(nd.Drivers) == 0 {
ctx.Emit(nom.NodeLeft(nd.Node))
return d.Del(k)
}
if ndd.Role == nom.DriverRoleMaster {
// TODO(soheil): Maybe a smarter load balacning technique.
gdict := ctx.Dict(genDict)
gen := uint64(0)
if v, err := gdict.Get("gen"); err == nil {
gen = v.(uint64)
}
gen++
nd.Drivers[0].Role = nom.DriverRoleMaster
ctx.SendToBee(nom.ChangeDriverRole{
Node: nd.Node.UID(),
Role: nom.DriverRoleMaster,
Generation: gen,
}, nd.master().BeeID)
}
return d.Put(k, nd)
}
func (h nodeDisconnectedHandler) Map(msg bh.Msg,
ctx bh.MapContext) bh.MappedCells {
nd := msg.Data().(nom.NodeDisconnected)
return bh.MappedCells{{driversDict, string(nd.Node.ID)}}
}
type roleUpdateHandler struct{}
func (h roleUpdateHandler) Rcv(msg bh.Msg, ctx bh.RcvContext) error {
ru := msg.Data().(nom.DriverRoleUpdate)
ddict := ctx.Dict(driversDict)
k := string(ru.Node)
v, err := ddict.Get(k)
if err != nil {
return fmt.Errorf("role update received before node %v connects", ru.Node)
}
n := v.(nodeDrivers)
found := false
for i := range n.Drivers {
if n.Drivers[i].BeeID == ru.Driver.BeeID {
found = true
n.Drivers[i].Role = ru.Driver.Role
break
}
}
if !found {
return fmt.Errorf("role update received before driver %v connects",
ru.Driver)
}
gdict := ctx.Dict(genDict)
gen := uint64(0)
if v, err := gdict.Get("gen"); err == nil {
gen = v.(uint64)
}
if ru.Generation > gen {
gdict.Put("gen", ru.Generation)
}
return nil
}
func (h roleUpdateHandler) Map(msg bh.Msg, ctx bh.MapContext) bh.MappedCells {
ru := msg.Data().(nom.DriverRoleUpdate)
return bh.MappedCells{{driversDict, string(ru.Node)}}
}