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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| package chatmessagehistory | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "time" | ||
|
|
||
| "github.com/go-redis/redis/v8" | ||
| "github.com/hupe1980/golc/schema" | ||
| ) | ||
|
|
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| // Compile time check to ensure Redis satisfies the ChatMessageHistory interface. | ||
| var _ schema.ChatMessageHistory = (*Redis)(nil) | ||
|
|
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| type RedisClient interface { | ||
| LRange(ctx context.Context, key string, start, stop int64) *redis.StringSliceCmd | ||
| LPush(ctx context.Context, key string, values ...interface{}) *redis.IntCmd | ||
| Del(ctx context.Context, keys ...string) *redis.IntCmd | ||
| Expire(ctx context.Context, key string, expiration time.Duration) *redis.BoolCmd | ||
| } | ||
|
|
||
| type RedisOptions struct { | ||
| KeyPrefix string | ||
| TTL *time.Duration | ||
| } | ||
|
|
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| type Redis struct { | ||
| sessionID string | ||
| redisClient RedisClient | ||
| opts RedisOptions | ||
| } | ||
|
|
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| func NewRedis(redisClient RedisClient, sessionID string) *Redis { | ||
| opts := RedisOptions{ | ||
| KeyPrefix: "message_store:", | ||
| } | ||
|
|
||
| return &Redis{ | ||
| sessionID: sessionID, | ||
| redisClient: redisClient, | ||
| opts: opts, | ||
| } | ||
| } | ||
|
|
||
| func (mh *Redis) Messages() (schema.ChatMessages, error) { | ||
| messages := schema.ChatMessages{} | ||
|
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| items, err := mh.redisClient.LRange(context.Background(), mh.key(), 0, -1).Result() | ||
| if err != nil { | ||
| if err == redis.Nil { | ||
| return messages, nil | ||
| } | ||
|
|
||
| return nil, err | ||
| } | ||
|
|
||
| if len(items) == 0 { | ||
| return messages, nil | ||
| } | ||
|
|
||
| for _, item := range items { | ||
| message := map[string]string{} | ||
|
|
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| if err = json.Unmarshal([]byte(item), &message); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| cm, err := schema.MapToChatMessage(message) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| messages = append(messages, cm) | ||
| } | ||
|
|
||
| return messages, nil | ||
| } | ||
|
|
||
| func (mh *Redis) AddUserMessage(text string) error { | ||
| message := schema.NewHumanChatMessage(text) | ||
| return mh.AddMessage(message) | ||
| } | ||
|
|
||
| func (mh *Redis) AddAIMessage(text string) error { | ||
| message := schema.NewAIChatMessage(text) | ||
| return mh.AddMessage(message) | ||
| } | ||
|
|
||
| func (mh *Redis) AddMessage(message schema.ChatMessage) error { | ||
| redisMessage := schema.ChatMessageToMap(message) | ||
|
|
||
| messageJSON, err := json.Marshal(redisMessage) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if err := mh.redisClient.LPush(context.Background(), mh.key(), string(messageJSON)).Err(); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if mh.opts.TTL != nil { | ||
| if err := mh.redisClient.Expire(context.Background(), mh.key(), *mh.opts.TTL).Err(); err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (mh *Redis) Clear() error { | ||
| res := mh.redisClient.Del(context.TODO(), mh.key()) | ||
| return res.Err() | ||
| } | ||
|
|
||
| func (mh *Redis) key() string { | ||
| return mh.opts.KeyPrefix + mh.sessionID | ||
| } |
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