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WIP: Redis persistance example (#35)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,153 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| "log" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/anthdm/hollywood/actor" | ||
| "github.com/redis/go-redis/v9" | ||
| ) | ||
|
|
||
| type Storer interface { | ||
| Store(key string, data []byte) error | ||
| Load(key string) ([]byte, error) | ||
| } | ||
|
|
||
| func WithPersistance(store Storer) func(actor.ReceiveFunc) actor.ReceiveFunc { | ||
| return func(next actor.ReceiveFunc) actor.ReceiveFunc { | ||
| return func(c *actor.Context) { | ||
| switch c.Message().(type) { | ||
| case actor.Initialized: | ||
| p, ok := c.Receiver().(Persister) | ||
| if !ok { | ||
| next(c) | ||
| return | ||
| } | ||
| b, err := store.Load(c.PID().String()) | ||
| if err != nil { | ||
| fmt.Println(err) | ||
| next(c) | ||
| return | ||
| } | ||
| var data map[string]any | ||
| if err := json.Unmarshal(b, &data); err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| if err := p.LoadState(data); err != nil { | ||
| fmt.Println("load state error:", err) | ||
| next(c) | ||
| } | ||
| case actor.Stopped: | ||
| if p, ok := c.Receiver().(Persister); ok { | ||
| s, err := p.State() | ||
| if err != nil { | ||
| fmt.Println("could not get state", err) | ||
| next(c) | ||
| return | ||
| } | ||
| if err := store.Store(c.PID().String(), s); err != nil { | ||
| fmt.Println("failed to store the state", err) | ||
| next(c) | ||
| return | ||
| } | ||
| } | ||
| } | ||
| next(c) | ||
| } | ||
| } | ||
| } | ||
|
|
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| type Persister interface { | ||
| State() ([]byte, error) | ||
| LoadState(map[string]any) error | ||
| } | ||
|
|
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| type State struct { | ||
| Health int `json:"health"` | ||
| Username string `json:"username"` | ||
| } | ||
|
|
||
| type PlayerState struct { | ||
| Health int | ||
| Username string | ||
| } | ||
|
|
||
| type TakeDamage struct { | ||
| Amount int | ||
| } | ||
|
|
||
| func (p *PlayerState) Receive(c *actor.Context) { | ||
| switch msg := c.Message().(type) { | ||
| case actor.Started: | ||
| case actor.Stopped: | ||
| case TakeDamage: | ||
| p.Health -= msg.Amount | ||
| fmt.Println("took damage, health ", p.Health) | ||
| } | ||
| } | ||
|
|
||
| func newPlayerState(health int, username string) actor.Producer { | ||
| return func() actor.Receiver { | ||
| return &PlayerState{ | ||
| Health: health, | ||
| Username: username, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (p *PlayerState) LoadState(data map[string]any) error { | ||
| fmt.Println("player loading state", data) | ||
| p.Health = int(data["health"].(float64)) | ||
| p.Username = data["username"].(string) | ||
| return nil | ||
| } | ||
|
|
||
| func (p *PlayerState) State() ([]byte, error) { | ||
| state := State{ | ||
| Username: p.Username, | ||
| Health: p.Health, | ||
| } | ||
| return json.Marshal(state) | ||
| } | ||
|
|
||
| type RedisStore struct { | ||
| client *redis.Client | ||
| } | ||
|
|
||
| func newRedisStore(c *redis.Client) *RedisStore { | ||
| return &RedisStore{ | ||
| client: c, | ||
| } | ||
| } | ||
|
|
||
| func (r *RedisStore) Store(key string, state []byte) error { | ||
| return r.client.Set(context.TODO(), key, state, 0).Err() | ||
| } | ||
|
|
||
| func (r *RedisStore) Load(key string) ([]byte, error) { | ||
| val, err := r.client.Get(context.TODO(), key).Result() | ||
| return []byte(val), err | ||
| } | ||
|
|
||
| func main() { | ||
| var ( | ||
| e = actor.NewEngine() | ||
| redisClient = redis.NewClient(&redis.Options{ | ||
| Addr: "localhost:6379", | ||
| Password: "", // no password set | ||
| DB: 0, // use default DB | ||
| }) | ||
| store = newRedisStore(redisClient) | ||
| pid = e.Spawn(newPlayerState(100, "James"), "playerState", actor.WithMiddleware(WithPersistance(store))) | ||
| ) | ||
| time.Sleep(time.Second * 1) | ||
| e.Send(pid, TakeDamage{Amount: 9}) | ||
| time.Sleep(time.Second * 1) | ||
| wg := &sync.WaitGroup{} | ||
| e.Poison(pid, wg) | ||
| wg.Wait() | ||
| } |
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