Restruct (#34)

* modify

* remove

* modify

* modify

* remove no use

* add online/offline notification

* modify

* format log

* add reference

lib/sessions/redisprovider.go

@@ -0,0 +1,95 @@
+package sessions
+
+import (
+	"time"
+
+	log "github.com/cihub/seelog"
+	"github.com/go-redis/redis"
+	jsoniter "github.com/json-iterator/go"
+)
+
+var redisClient *redis.Client
+var _ SessionsProvider = (*redisProvider)(nil)
+
+const (
+	sessionName = "session"
+)
+
+type redisProvider struct {
+}
+
+func init() {
+	Register("redis", NewRedisProvider())
+}
+
+func InitRedisConn(url string) {
+	redisClient = redis.NewClient(&redis.Options{
+		Addr:     "127.0.0.1:6379",
+		Password: "", // no password set
+		DB:       0,  // use default DB
+	})
+	err := redisClient.Ping().Err()
+	for err != nil {
+		log.Error("connect redis error: ", err, " 3s try again...")
+		time.Sleep(3 * time.Second)
+		err = redisClient.Ping().Err()
+	}
+}
+
+func NewRedisProvider() *redisProvider {
+	return &redisProvider{}
+}
+
+func (r *redisProvider) New(id string) (*Session, error) {
+	val, _ := jsoniter.Marshal(&Session{id: id})
+
+	err := redisClient.HSet(sessionName, id, val).Err()
+	if err != nil {
+		return nil, err
+	}
+
+	result, err := redisClient.HGet(sessionName, id).Bytes()
+	if err != nil {
+		return nil, err
+	}
+
+	sess := Session{}
+	err = jsoniter.Unmarshal(result, &sess)
+	if err != nil {
+		return nil, err
+	}
+
+	return &sess, nil
+}
+
+func (r *redisProvider) Get(id string) (*Session, error) {
+
+	result, err := redisClient.HGet(sessionName, id).Bytes()
+	if err != nil {
+		return nil, err
+	}
+
+	sess := Session{}
+	err = jsoniter.Unmarshal(result, &sess)
+	if err != nil {
+		return nil, err
+	}
+
+	return &sess, nil
+}
+
+func (r *redisProvider) Del(id string) {
+	redisClient.HDel(sessionName, id)
+}
+
+func (r *redisProvider) Save(id string) error {
+	return nil
+}
+
+func (r *redisProvider) Count() int {
+	return int(redisClient.HLen(sessionName).Val())
+}
+
+func (r *redisProvider) Close() error {
+	return redisClient.Del(sessionName).Err()
+}