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https://github.com/yangjian102621/geekai.git
synced 2025-11-13 12:43:43 +08:00
[feat] preliminary completion ollama chat.
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dmd
315
api/handler/chatimpl/ollama_handler.go
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315
api/handler/chatimpl/ollama_handler.go
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@@ -0,0 +1,315 @@
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package chatimpl
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// * +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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// * Copyright 2023 The Geek-AI Authors. All rights reserved.
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// * Use of this source code is governed by a Apache-2.0 license
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// * that can be found in the LICENSE file.
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// * @Author yangjian102621@163.com
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// * +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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import (
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"bufio"
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"html/template"
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"io"
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"net/http"
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"strings"
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"time"
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"unicode/utf8"
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"github.com/levigross/grequests"
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"geekai/core/types"
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"geekai/store/model"
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"geekai/store/vo"
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"geekai/utils"
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)
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type ollamaResp struct {
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Id string `json:"id"`
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Model string `json:"model"`
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CreatedAt string `json:"created_at"`
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Response string `json:"response"`
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Done bool `json:"done"`
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DoneReason string `json:"done_reason"`
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Context []int `json:"context"`
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TotalDuration int64 `json:"total_duration"` // 生成响应所花费的总时间
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LoadDuration int64 `json:"load_duration"` // 以纳秒为单位加载模型所花费的时间
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PromptEvalCount int `json:"prompt_eval_count"` // 提示文本中的标记（tokens）数量
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PromptEvalDuration int64 `json:"prompt_eval_duration"` // 以纳秒为单位评估提示文本所花费的时间
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EvalCount int64 `json:"eval_count"` // 生成响应中的标记数量
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EvalDuration int64 `json:"eval_duration"` // 以纳秒为单位生成响应所花费的时间
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}
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// 通义千问消息发送实现
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func (h *ChatHandler) sendOllamaMessage(
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chatCtx []types.Message,
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req types.ApiRequest,
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userVo vo.User,
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ctx context.Context,
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session *types.ChatSession,
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role model.ChatRole,
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prompt string,
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ws *types.WsClient) error {
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promptCreatedAt := time.Now() // 记录提问时间
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start := time.Now()
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//var apiKey = model.ApiKey{}
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//response, err := h.doRequest(ctx, req, session, &apiKey)
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response, err := h.sendOllamaRequest(session, prompt)
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defer response.Body.Close()
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logger.Info("HTTP请求完成，耗时：", time.Now().Sub(start))
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if err != nil {
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h.processError(err, prompt, ws)
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}
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contentType := response.Header.Get("Content-Type")
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if strings.Contains(contentType, "application/x-ndjson") {
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h.processOllamaStreamResponse(chatCtx, req, userVo, response, ws, prompt, session, role, promptCreatedAt)
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} else {
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if err = h.processOllamaJsonResponse(response, ws); err != nil {
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return err
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}
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}
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return nil
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}
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func (h *ChatHandler) sendOllamaRequest(session *types.ChatSession, prompt string) (*http.Response, error) {
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apiKey, err := h.queryApiKey(session)
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if err != nil {
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return nil, err
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}
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// todo add context to request body
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postData := map[string]interface{}{
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"model": session.Model.Value,
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"stream": true,
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"prompt": prompt,
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}
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headers := map[string]string{
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"Content-Type": "application/json",
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"Authorization": "Bearer " + apiKey.Value,
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}
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ro := &grequests.RequestOptions{
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JSON: postData,
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Headers: headers,
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}
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resp, err := grequests.Post(apiKey.ApiURL, ro)
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if err != nil {
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return nil, err
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}
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if !resp.Ok {
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return nil, resp.Error
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}
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return resp.RawResponse, nil
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}
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func (h *ChatHandler) queryApiKey(session *types.ChatSession) (*model.ApiKey, error) {
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apiKey := &model.ApiKey{}
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// if the chat model bind a KEY, use it directly
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if session.Model.KeyId > 0 {
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h.DB.Debug().Where("id", session.Model.KeyId).Where("enabled", true).Find(apiKey)
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}
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// use the last unused key
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if apiKey.Id == 0 {
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h.DB.Debug().Where("platform", session.Model.Platform).Where("type", "chat").Where("enabled", true).Order("last_used_at ASC").First(apiKey)
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}
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if apiKey.Id == 0 {
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return nil, errors.New("no available key, please import key")
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}
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h.DB.Model(apiKey).UpdateColumn("last_used_at", time.Now().Unix())
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return apiKey, nil
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}
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func (h *ChatHandler) processOllamaStreamResponse(
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chatCtx []types.Message, req types.ApiRequest, userVo vo.User,
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response *http.Response, ws *types.WsClient, prompt string,
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session *types.ChatSession, role model.ChatRole, promptCreatedAt time.Time) {
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// 记录回复时间
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replyCreatedAt := time.Now()
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// 循环读取 Chunk 消息
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var message = types.Message{}
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scanner := bufio.NewScanner(response.Body)
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var content string
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var replyTokens int
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for scanner.Scan() {
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var resp ollamaResp
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line := scanner.Text()
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err := utils.JsonDecode(line, &resp)
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if err != nil {
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logger.Error("error with parse data line: ", content)
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utils.ReplyMessage(ws, fmt.Sprintf("**解析数据行失败：%s**", err))
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break
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}
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if resp.Done == true && resp.DoneReason == "stop" {
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utils.ReplyChunkMessage(ws, types.WsMessage{Type: types.WsEnd})
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message.Content = utils.InterfaceToString(resp.Context)
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replyTokens = resp.PromptEvalCount
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// 消息发送成功后做记录工作
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h.recordInfoAfterSendMessage(chatCtx, req, userVo, message, prompt, session, role, promptCreatedAt, replyTokens, replyCreatedAt)
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break
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} else if resp.Done == true && resp.DoneReason != "stop" {
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utils.ReplyMessage(ws, fmt.Sprintf("**API 返回错误：%s**", resp.DoneReason))
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break
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}
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if len(resp.Id) > 0 {
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utils.ReplyChunkMessage(ws, types.WsMessage{Type: types.WsStart})
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}
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if len(resp.Response) > 0 {
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utils.ReplyChunkMessage(ws, types.WsMessage{
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Type: types.WsMiddle,
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Content: utils.InterfaceToString(resp.Response),
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})
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}
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}
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if err := scanner.Err(); err != nil {
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if strings.Contains(err.Error(), "context canceled") {
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logger.Info("用户取消了请求：", prompt)
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} else {
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logger.Error("信息读取出错：", err)
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}
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}
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}
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func (h *ChatHandler) processOllamaJsonResponse(response *http.Response, ws *types.WsClient) error {
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body, err := io.ReadAll(response.Body)
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if err != nil {
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return fmt.Errorf("error with reading response: %v", err)
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}
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var res struct {
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Code int `json:"error_code"`
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Msg string `json:"error_msg"`
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}
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err = json.Unmarshal(body, &res)
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if err != nil {
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return fmt.Errorf("error with decode response: %v", err)
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}
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utils.ReplyMessage(ws, "请求Ollama大模型 API 失败："+res.Msg)
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return nil
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}
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func (h *ChatHandler) recordInfoAfterSendMessage(chatCtx []types.Message, req types.ApiRequest, userVo vo.User, message types.Message, prompt string, session *types.ChatSession, role model.ChatRole, promptCreatedAt time.Time, replyTokens int, replyCreatedAt time.Time) {
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if message.Role == "" {
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message.Role = "assistant"
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}
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useMsg := types.Message{Role: "user", Content: prompt}
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// 更新上下文消息，如果是调用函数则不需要更新上下文
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if h.App.SysConfig.EnableContext {
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chatCtx = append(chatCtx, useMsg) // 提问消息
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chatCtx = append(chatCtx, message) // 回复消息
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h.App.ChatContexts.Put(session.ChatId, chatCtx)
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}
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// 追加聊天记录
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// for prompt
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promptToken, err := utils.CalcTokens(prompt, req.Model)
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if err != nil {
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logger.Error(err)
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}
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historyUserMsg := model.ChatMessage{
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UserId: userVo.Id,
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ChatId: session.ChatId,
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RoleId: role.Id,
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Type: types.PromptMsg,
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Icon: userVo.Avatar,
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Content: template.HTMLEscapeString(prompt),
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Tokens: promptToken,
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UseContext: true,
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Model: req.Model,
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}
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historyUserMsg.CreatedAt = promptCreatedAt
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historyUserMsg.UpdatedAt = promptCreatedAt
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res := h.DB.Save(&historyUserMsg)
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if res.Error != nil {
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logger.Error("failed to save prompt history message: ", res.Error)
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}
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// for reply
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// 计算本次对话消耗的总 token 数量
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//totalTokens := replyTokens + getTotalTokens(req)
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// todo rebuild the tokens
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historyReplyMsg := model.ChatMessage{
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UserId: userVo.Id,
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ChatId: session.ChatId,
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RoleId: role.Id,
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Type: types.ReplyMsg,
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Icon: role.Icon,
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Content: message.Content,
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Tokens: replyTokens,
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UseContext: true,
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Model: req.Model,
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}
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historyReplyMsg.CreatedAt = replyCreatedAt
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historyReplyMsg.UpdatedAt = replyCreatedAt
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res = h.DB.Create(&historyReplyMsg)
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if res.Error != nil {
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logger.Error("failed to save reply history message: ", res.Error)
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}
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// 更新用户算力
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h.subUserPower(userVo, session, promptToken, replyTokens)
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// 保存当前会话
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var chatItem model.ChatItem
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res = h.DB.Where("chat_id = ?", session.ChatId).First(&chatItem)
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if res.Error != nil {
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chatItem.ChatId = session.ChatId
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chatItem.UserId = session.UserId
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chatItem.RoleId = role.Id
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chatItem.ModelId = session.Model.Id
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if utf8.RuneCountInString(prompt) > 30 {
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chatItem.Title = string([]rune(prompt)[:30]) + "..."
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} else {
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chatItem.Title = prompt
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}
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chatItem.Model = req.Model
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h.DB.Create(&chatItem)
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}
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}
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func (h *ChatHandler) processError(err error, prompt string, ws *types.WsClient) {
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if strings.Contains(err.Error(), "context canceled") {
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logger.Info("用户取消了请求：", prompt)
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return
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} else if strings.Contains(err.Error(), "no available key") {
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utils.ReplyMessage(ws, "抱歉😔😔😔，系统已经没有可用的 API KEY，请联系管理员！")
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return
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} else {
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logger.Error(err)
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}
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utils.ReplyMessage(ws, ErrorMsg)
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utils.ReplyMessage(ws, ErrImg)
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return
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}
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