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ChatRedisMemory.java
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239 lines (206 loc) · 8.65 KB
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import cn.wxw.ai.model.entity.ChatEntity;
import cn.wxw.ai.common.UserContextHolder;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.ai.chat.memory.ChatMemory;
import org.springframework.ai.chat.messages.*;
import org.springframework.data.redis.core.RedisTemplate;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;
/**
* @description: 基于 Redis 的 ChatMemory
* @author: wxw
* @date: 2025/9/16
*/
@Slf4j
public class ChatRedisMemory implements ChatMemory {
/**
* 聊天记录的 Redis key 前缀
*/
private static final String KEY_PREFIX = "chat:history:";
/**
* 取最后 maxMessages 条聊天记录
*/
private final int maxMessages;
private final RedisTemplate<String, Object> redisTemplate;
/**
* 用户唯一标识, 用来隔离不同用户的记忆
*/
private final String defaultUID;
public ChatRedisMemory(RedisTemplate<String, Object> redisTemplate,
int maxMessages,
String defaultUID) {
this.redisTemplate = redisTemplate;
this.maxMessages = maxMessages;
this.defaultUID = defaultUID;
}
/**
* 获取当前有效的用户ID
*/
private String getCurrentUID() {
String username = UserContextHolder.getUsername();
return username != null ? username : defaultUID;
}
/**
* 添加聊天记录
* @param conversationId
* @param messages
*/
@Override
public void add(String conversationId, List<Message> messages) {
String key = KEY_PREFIX + getCurrentUID() + ":" + conversationId;
List<ChatEntity> chatEntityList = new ArrayList<>();
for (Message message : messages) {
// 解析消息内容
String text = message.getText();
// 构造聊天记录实体
ChatEntity chatEntity = new ChatEntity();
chatEntity.setChatId(conversationId);
chatEntity.setType(message.getMessageType().getValue());
chatEntity.setContent(text);
chatEntityList.add(chatEntity);
}
// 保存聊天记录到 Redis
redisTemplate.opsForList().rightPushAll(key, chatEntityList.toArray());
redisTemplate.expire(key, 30, TimeUnit.DAYS);
log.info("聊天记录已保存");
}
/**
* 获取聊天记录
* @param conversationId
* @return
*/
@Override
public List<Message> get(String conversationId) {
// 使用pattern获取当前用户的所有会话key
String pattern = KEY_PREFIX + getCurrentUID() + ":*";
Set<String> keys = redisTemplate.keys(pattern);
// 存储所有会话的聊天记录
List<Message> allMessages = new ArrayList<>();
if (keys != null && !keys.isEmpty()) {
for (String key : keys) {
Long size = redisTemplate.opsForList().size(key);
if (size != null && size > 0) {
List<Object> objectList = redisTemplate.opsForList().range(key, 0, -1);
// 解析聊天记录实体并添加到总列表
ObjectMapper mapper = new ObjectMapper();
for (Object object : objectList) {
try {
// 标准转换
ChatEntity chatEntity = mapper.convertValue(object, ChatEntity.class);
// 解码内容
String decodedContent = decodeChineseContent(chatEntity.getContent());
chatEntity.setContent(decodedContent);
Message message = null;
if (MessageType.USER.getValue().equals(chatEntity.getType())) {
message = new UserMessage(chatEntity.getContent());
} else if (MessageType.SYSTEM.getValue().equals(chatEntity.getType())) {
message = new SystemMessage(chatEntity.getContent());
} else if (MessageType.ASSISTANT.getValue().equals(chatEntity.getType())) {
message = new AssistantMessage(chatEntity.getContent());
}
if (message != null) {
allMessages.add(message);
}
} catch (Exception e) {
log.error("解析聊天记录失败: {}", e.getMessage());
}
}
}
}
}
// 如果消息总数超过maxMessages，只返回最近的maxMessages条
int totalMessages = allMessages.size();
int startIndex = Math.max(0, totalMessages - maxMessages);
log.info("聊天记录总条数: {}", totalMessages);
log.info("返回的聊天记录条数: {}", Math.min(totalMessages, maxMessages));
return allMessages.subList(startIndex, totalMessages);
}
/**
* 解码内容
* 处理 Redis 中存储的中文转义序列，同时保留英文内容
*/
private String decodeChineseContent(String content) {
if (content == null || content.isEmpty()) {
return content;
}
try {
// 检查是否包含十六进制编码的中文转义序列
if (content.contains("\\x")) {
StringBuilder sb = new StringBuilder();
int i = 0;
while (i < content.length()) {
// 寻找十六进制转义序列 \x 开始的位置
if (i + 3 < content.length() && content.charAt(i) == '\\' && content.charAt(i + 1) == 'x') {
try {
// 提取十六进制值
String hex = content.substring(i + 2, i + 4);
// 将十六进制转换为字符并添加到结果中
sb.append((char) Integer.parseInt(hex, 16));
// 跳过已处理的四个字符（\xHH）
i += 4;
} catch (NumberFormatException e) {
// 如果不是有效的十六进制值，保留原始字符
sb.append(content.charAt(i));
i++;
}
} else {
// 对于非转义序列的字符，直接保留
sb.append(content.charAt(i));
i++;
}
}
return sb.toString();
}
// 如果不包含转义序列，直接返回原始内容
return content;
} catch (Exception e) {
log.warn("解码内容失败，使用原始内容: {}", e.getMessage());
return content;
}
}
/**
* 清空聊天记录
* @param conversationId
*/
@Override
public void clear(String conversationId) {
// 删除用户的所有聊天记录
String pattern = KEY_PREFIX + getCurrentUID() + ":*";
Set<String> keys = redisTemplate.keys(pattern);
if (keys != null && !keys.isEmpty()) {
redisTemplate.delete(keys);
log.info("已删除用户{}的所有聊天记录，共{}条", getCurrentUID(), keys.size());
}
}
public static ChatRedisMemory.Builder builder() {
return new ChatRedisMemory.Builder();
}
public static final class Builder {
private RedisTemplate<String, Object> redisTemplate;
private int maxMessages = 10;
private String defaultUID;
private Builder() {
}
public ChatRedisMemory.Builder redisTemplate(RedisTemplate<String, Object> redisTemplate) {
this.redisTemplate = redisTemplate;
return this;
}
public ChatRedisMemory.Builder maxMessages(int maxMessages) {
this.maxMessages = maxMessages;
return this;
}
public ChatRedisMemory.Builder uID(String defaultUID) {
this.defaultUID = defaultUID;
return this;
}
public ChatRedisMemory build() {
if (this.redisTemplate == null) {
this.redisTemplate = new RedisTemplate<>();
}
return new ChatRedisMemory(this.redisTemplate, this.maxMessages, this.defaultUID);
}
}
}