Feat: save/load state

handlers/actions.go

@@ -3,6 +3,7 @@ package handlers
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"golias/models"
 )
 
@@ -28,7 +29,44 @@ func getRoomIDFromCtx(ctx context.Context) string {
 	return id
 }
 
+func getStateByCtx(ctx context.Context) (*models.UserState, error) {
+	username, ok := ctx.Value(models.CtxUsernameKey).(string)
+	if !ok {
+		log.Debug("no username in ctx")
+		return &models.UserState{}, errors.New("no username in ctx")
+	}
+	us, err := loadState(username)
+	if err != nil {
+		return &models.UserState{}, err
+	}
+	return us, nil
+}
+
 // cache
+
+func saveState(username string, state *models.UserState) error {
+	key := models.CacheStatePrefix + username
+	data, err := json.Marshal(state)
+	if err != nil {
+		return err
+	}
+	memcache.Set(key, data)
+	return nil
+}
+
+func loadState(username string) (*models.UserState, error) {
+	key := models.CacheStatePrefix + username
+	data, err := memcache.Get(key)
+	if err != nil {
+		return nil, err
+	}
+	resp := &models.UserState{}
+	if err := json.Unmarshal(data, &resp); err != nil {
+		return nil, err
+	}
+	return resp, nil
+}
+
 func getAllNames() []string {
 	names := []string{}
 	// will not scale