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consistnent_hash_router.go
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consistnent_hash_router.go
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package router
import (
"log"
"github.com/AsynkronIT/protoactor-go/actor"
"github.com/serialx/hashring"
)
type Hasher interface {
Hash() string
}
type consistentHashGroupRouter struct {
GroupRouter
}
type consistentHashPoolRouter struct {
PoolRouter
}
type consistentHashRouterState struct {
hashring *hashring.HashRing
routeeMap map[string]*actor.PID
}
func (state *consistentHashRouterState) SetRoutees(routees *actor.PIDSet) {
//lookup from node name to PID
state.routeeMap = make(map[string]*actor.PID)
nodes := make([]string, routees.Len())
routees.ForEach(func(i int, pid actor.PID) {
nodeName := pid.Address + "@" + pid.Id
nodes[i] = nodeName
state.routeeMap[nodeName] = &pid
})
//initialize hashring for mapping message keys to node names
state.hashring = hashring.New(nodes)
}
func (state *consistentHashRouterState) GetRoutees() *actor.PIDSet {
var routees actor.PIDSet
for _, v := range state.routeeMap {
routees.Add(v)
}
return &routees
}
func (state *consistentHashRouterState) RouteMessage(message interface{}, sender *actor.PID) {
switch msg := message.(type) {
case Hasher:
key := msg.Hash()
node, ok := state.hashring.GetNode(key)
if !ok {
log.Printf("[ROUTING] Consistent has router failed to derminate routee: %v", key)
return
}
if routee, ok := state.routeeMap[node]; ok {
routee.Request(msg, sender)
} else {
log.Println("[ROUTING] Consisten router failed to resolve node", node)
}
default:
log.Println("[ROUTING] Message must implement router.Hasher", msg)
}
}
func (state *consistentHashRouterState) InvokeRouterManagementMessage(msg ManagementMessage, sender *actor.PID) {
}
func NewConsistentHashPool(size int) actor.Props {
return actor.FromSpawn(spawner(&consistentHashPoolRouter{PoolRouter{PoolSize: size}}))
}
func NewConsistentHashGroup(routees ...*actor.PID) actor.Props {
return actor.FromSpawn(spawner(&consistentHashGroupRouter{GroupRouter{Routees: actor.NewPIDSet(routees...)}}))
}
func (config *consistentHashPoolRouter) CreateRouterState() Interface {
return &consistentHashRouterState{}
}
func (config *consistentHashGroupRouter) CreateRouterState() Interface {
return &consistentHashRouterState{}
}