saw-go/service/spark.go

package service

import (
	"StuAcaWorksAI/dao"
	"StuAcaWorksAI/proto"
	"StuAcaWorksAI/worker"
	"crypto/hmac"
	"crypto/sha256"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"github.com/gorilla/websocket"
	"github.com/ollama/ollama/api"
	"io"
	"log"
	"net/http"
	"net/url"
	"strings"
	"time"
)

/***************** Spark请求结构 ***********************/
type SparkRequestHeader struct {
	AppID string `json:"app_id"`
	UID   string `json:"uid,omitempty"`
}

type ChatParameter struct {
	Domain      string  `json:"domain"`
	Temperature float64 `json:"temperature"`
	MaxTokens   int     `json:"max_tokens"`
}

type Parameter struct {
	Chat ChatParameter `json:"chat"`
}

type MessageContent struct {
	Role    string `json:"role"`
	Content string `json:"content"`
}

type SparkMessage struct {
	Text []MessageContent `json:"text"`
}

type SparkRequestPayload struct {
	Message SparkMessage `json:"message"`
}

type SparkRequest struct {
	Header    SparkRequestHeader  `json:"header"`
	Parameter Parameter           `json:"parameter"`
	Payload   SparkRequestPayload `json:"payload"`
}

/***************** Spark请求结构 ***********************/

/***************** Spark响应结构 ***********************/

type SparkResponseHeader struct {
	Code    int    `json:"code"`
	Message string `json:"message"`
	SID     string `json:"sid"`
	Status  int    `json:"status"` //会话状态，取值为[0,1,2]；0代表首次结果；1代表中间结果；2代表最后一个结果
}

// ChoiceText 结构体对应 JSON 中 "choices.text[].text" 部分
type ChoiceText struct {
	Content string `json:"content"`
	Role    string `json:"role"`
	Index   int    `json:"index"`
}

// Choices 结构体对应 JSON 中 "choices" 部分
type Choices struct {
	Status int          `json:"status"`
	Seq    int          `json:"seq"`
	Text   []ChoiceText `json:"text"`
}

// UsageText 结构体对应 JSON 中 "usage.text" 部分
type UsageText struct {
	QuestionTokens   int `json:"question_tokens"`
	PromptTokens     int `json:"prompt_tokens"`
	CompletionTokens int `json:"completion_tokens"`
	TotalTokens      int `json:"total_tokens"`
}

// Usage 结构体对应 JSON 中 "usage" 部分
type Usage struct {
	Text UsageText `json:"text"`
}

// Payload 结构体对应 JSON 中 "payload" 部分
type SparkResponsePayload struct {
	Choices Choices `json:"choices"`
	Usage   Usage   `json:"usage"`
}

// Request 结构体对应整个 JSON 数据
type SparkResponse struct {
	Header  SparkResponseHeader  `json:"header"`
	Payload SparkResponsePayload `json:"payload"`
}

/***************** Spark响应结构 ***********************/

func Spark(modelParam proto.ModelParam, question, channel string, SessionID, UserID, modelID int) {
	log.Println("spark model param:", modelParam)
	log.Println("spark question:", question)
	//建立websocket连接
	dialer := websocket.Dialer{
		HandshakeTimeout: 5 * time.Second,
	}
	//建立连接
	conn, resp, err := dialer.Dial(assembleAuthUrl(modelParam.Url, modelParam.APIKey, modelParam.APISecret), nil)
	if err != nil {
		panic(readResp(resp) + err.Error())
		return
	} else if resp.StatusCode != 101 {
		panic(readResp(resp) + err.Error())
	}

	//发送消息
	go func() {
		data := genSparkParams(question, modelParam.APPID, modelParam.Domain, SessionID, modelParam.System)
		//将数据转换为json
		//dataByte, err := json.Marshal(data)
		if err != nil {
			fmt.Println("Error parsing JSON:", err)
			return
		}
		err2 := conn.WriteJSON(data)
		if err != nil {
			fmt.Println("write message error:", err2)
			return
		}
	}()

	answer := ""

	//接收消息
	for {
		_, msg, err2 := conn.ReadMessage()
		if err2 != nil {
			log.Println("read message error:", err2)
			break
		}
		var data SparkResponse
		err = json.Unmarshal(msg, &data)
		if err != nil {
			log.Println("Error parsing JSON:", err)
			return
		}

		if data.Header.Code != 0 {
			log.Println("Error response:", data.Header.Message, string(msg))
			break
		}
		if data.Header.Status == 2 {
			//最后一个结果
			answer += data.Payload.Choices.Text[0].Content
		} else {
			answer += data.Payload.Choices.Text[0].Content
		}
		go CreateAIStreamMsg(UserID, modelID, SessionID, data, modelParam.Model)
		SparkToGeneralMassageAndSendMsgQueue(&data, channel, SessionID, UserID)
	}

	conn.Close()
	//将消息存入数据库
	err2, msgID := dao.CreateMessage(SessionID, modelID, UserID, proto.ModelToUserMsgType, proto.MsgHasRead, answer)
	if err2 != nil {
		log.Println("spark create message error:", err2)
	} else {
		log.Println("spark create message success,message id:", msgID)
	}
}

func SparkToGeneralMassageAndSendMsgQueue(data *SparkResponse, channel string, SessionID int, UserID int) {
	var aiMsg proto.AIQueueMessage
	var wsMsg proto.WSMessage
	var apiMsg api.GenerateResponse
	apiMsg.Model = proto.ModelTypeSpark
	apiMsg.Response = data.Payload.Choices.Text[0].Content
	if data.Header.Status == 2 {
		apiMsg.Done = true
	} else {
		apiMsg.Done = false
	}
	//消息队列部分
	aiMsg.Type = proto.ModelTypeSpark
	aiMsg.Msg = apiMsg
	//ws发送消息部分
	wsMsg.Msg = aiMsg
	wsMsg.SessionID = SessionID
	wsMsg.ToID = UserID
	wsMsg.Type = proto.ModelTypeSpark

	//发送消息
	wsMsgStr, _ := json.Marshal(wsMsg)
	worker.Publish(channel, string(wsMsgStr), time.Second*60)
}

// 生成参数
func genSparkParams(question, appid string, domain string, sessionID int, systemPrompt string) SparkRequest {
	//messages := []MessageContent{
	//	{Role: "user", Content: question},
	//}
	messages2 := make([]MessageContent, 0)
	err := GetSparkSessionHistoryMsg(sessionID, systemPrompt, &messages2, question)
	if err != nil {
		log.Println("get spark session history message error:", err)
	}
	//messages2Str, _ := json.Marshal(messages2)
	//log.Println("spark messages2:", string(messages2Str))

	data := SparkRequest{
		Header: SparkRequestHeader{
			AppID: appid,
		},
		Parameter: Parameter{
			Chat: ChatParameter{
				Domain:      domain,
				Temperature: 0.8,
				MaxTokens:   2048,
			},
		},
		Payload: SparkRequestPayload{
			Message: SparkMessage{
				Text: messages2,
			},
		},
	}
	return data
}

// 创建鉴权url  apikey 即 hmac username
func assembleAuthUrl(hostUrl string, apiKey, apiSecret string) string {
	ul, err := url.Parse(hostUrl)
	if err != nil {
		fmt.Println(err)
	}
	//签名时间
	date := time.Now().UTC().Format(time.RFC1123)
	//date = "Tue, 28 May 2019 09:10:42 MST"
	//参与签名的字段 host ,date, request-line
	signString := []string{"host: " + ul.Host, "date: " + date, "GET " + ul.Path + " HTTP/1.1"}
	//拼接签名字符串
	sgin := strings.Join(signString, "\n")
	// fmt.Println(sgin)
	//签名结果
	sha := HmacWithShaTobase64("hmac-sha256", sgin, apiSecret)
	// fmt.Println(sha)
	//构建请求参数 此时不需要urlencoding
	authUrl := fmt.Sprintf("hmac username=\"%s\", algorithm=\"%s\", headers=\"%s\", signature=\"%s\"", apiKey,
		"hmac-sha256", "host date request-line", sha)
	//将请求参数使用base64编码
	authorization := base64.StdEncoding.EncodeToString([]byte(authUrl))

	v := url.Values{}
	v.Add("host", ul.Host)
	v.Add("date", date)
	v.Add("authorization", authorization)
	//将编码后的字符串url encode后添加到url后面
	callurl := hostUrl + "?" + v.Encode()
	return callurl
}

func HmacWithShaTobase64(algorithm, data, key string) string {
	mac := hmac.New(sha256.New, []byte(key))
	mac.Write([]byte(data))
	encodeData := mac.Sum(nil)
	return base64.StdEncoding.EncodeToString(encodeData)
}

func readResp(resp *http.Response) string {
	if resp == nil {
		return ""
	}
	b, err := io.ReadAll(resp.Body)
	if err != nil {
		panic(err)
	}
	return fmt.Sprintf("code=%d,body=%s", resp.StatusCode, string(b))
}

// 获取spark模型会话的历史消息
func GetSparkSessionHistoryMsg(sessionID int, systemPrompt string, messages *[]MessageContent, prompt string) error {
	//获取会话的历史消息
	msgs := dao.FindMessageBySessionIDV2(sessionID)
	if len(msgs) > proto.SparkContextLength {
		//只取最后的 SparkContextLength 条消息
		msgs = msgs[len(msgs)-proto.SparkContextLength-1:]
	}
	//添加系统消息
	if systemPrompt != "" {
		var message MessageContent
		message.Role = "system"
		message.Content = systemPrompt
		*messages = append(*messages, message)
	}
	for _, msg := range msgs {
		var message MessageContent
		if msg.Type == proto.UserToModelMsgType {
			message.Role = proto.SparkRoleUser
		} else if msg.Type == proto.ModelToUserMsgType {
			message.Role = proto.SparkRoleAssistant
		} else {
			continue
		}
		message.Content = msg.Msg
		*messages = append(*messages, message)
	}
	//添加本次请求消息（上面获取到的已包含本次请求消息）
	//var message MessageContent
	//message.Role = "user"
	//message.Content = prompt
	//*messages = append(*messages, message)
	return nil
}