feat: use sse for chat process api

service/src/chatgpt/index.ts

@@ -237,13 +237,18 @@ search result: <search_result>${searchResultContent}</search_result>`,
 
       const finish_reason = chunk.choices[0]?.finish_reason
 
-      // Build response object similar to the original implementation
+      // 构建增量响应对象
       const responseChunk = {
         id: chunk.id,
-        reasoning: responseReasoning,
-        text: responseText,
+        reasoning: responseReasoning, // 累积的推理内容
+        text: responseText, // 累积的文本内容
         role: 'assistant',
         finish_reason,
+        // 增量数据，只包含本次新增的内容
+        delta: {
+          reasoning: reasoningContent, // 本次新增的推理内容
+          text: content, // 本次新增的文本内容
+        },
       }
 
       // Call the process callback if provided

service/src/chatgpt/types.ts

@@ -20,6 +20,11 @@ export interface ResponseChunk {
   reasoning?: string
   role?: string
   finish_reason?: string
+  // 支持增量响应
+  delta?: {
+    reasoning?: string
+    text?: string
+  }
 }
 
 export interface RequestOptions {

service/src/routes/chat.ts

@@ -225,7 +225,12 @@ router.post('/chat-clear', auth, async (req, res) => {
 })
 
 router.post('/chat-process', [auth, limiter], async (req, res) => {
-  res.setHeader('Content-type', 'application/octet-stream')
+  // 设置 SSE 响应头
+  res.setHeader('Content-Type', 'text/event-stream')
+  res.setHeader('Cache-Control', 'no-cache')
+  res.setHeader('Connection', 'keep-alive')
+  res.setHeader('Access-Control-Allow-Origin', '*')
+  res.setHeader('Access-Control-Allow-Headers', 'Cache-Control')
 
   let { roomId, uuid, regenerate, prompt, uploadFileKeys, options = {}, systemMessage, temperature, top_p } = req.body as RequestProps
   const userId = req.headers.userId.toString()
@@ -241,6 +246,22 @@ router.post('/chat-process', [auth, limiter], async (req, res) => {
   let result
   let message: ChatInfo
   let user = await getUserById(userId)
+
+  // SSE 辅助函数
+  const sendSSEData = (eventType: string, data: any) => {
+    res.write(`event: ${eventType}\n`)
+    res.write(`data: ${JSON.stringify(data)}\n\n`)
+  }
+
+  const sendSSEError = (error: string) => {
+    sendSSEData('error', JSON.stringify({ message: error }))
+  }
+
+  const sendSSEEnd = () => {
+    res.write('event: end\n')
+    res.write('data: [DONE]\n\n')
+  }
+
   try {
     // If use the fixed fakeuserid(some probability of duplicated with real ones), redefine user which is send to chatReplyProcess
     if (userId === '6406d8c50aedd633885fa16f') {
@@ -251,29 +272,56 @@ router.post('/chat-process', [auth, limiter], async (req, res) => {
       if (config.siteConfig?.usageCountLimit) {
         const useAmount = user ? (user.useAmount ?? 0) : 0
         if (Number(useAmount) <= 0 && user.limit_switch) {
-          res.send({ status: 'Fail', message: '提问次数用完啦 | Question limit reached', data: null })
+          sendSSEError('提问次数用完啦 | Question limit reached')
+          sendSSEEnd()
+          res.end()
           return
         }
       }
     }
 
     if (config.auditConfig.enabled || config.auditConfig.customizeEnabled) {
       if (!user.roles.includes(UserRole.Admin) && await containsSensitiveWords(config.auditConfig, prompt)) {
-        res.send({ status: 'Fail', message: '含有敏感词 | Contains sensitive words', data: null })
+        sendSSEError('含有敏感词 | Contains sensitive words')
+        sendSSEEnd()
+        res.end()
         return
       }
     }
+
     message = regenerate ? await getChat(roomId, uuid) : await insertChat(uuid, prompt, uploadFileKeys, roomId, model, options as ChatOptions)
-    let firstChunk = true
+
     result = await chatReplyProcess({
       message: prompt,
       uploadFileKeys,
       parentMessageId: options?.parentMessageId,
       process: (chunk: ResponseChunk) => {
         lastResponse = chunk
 
-        res.write(firstChunk ? JSON.stringify(chunk) : `\n${JSON.stringify(chunk)}`)
-        firstChunk = false
+        // 根据数据类型发送不同的 SSE 事件
+        if (chunk.searchQuery) {
+          sendSSEData('search_query', { searchQuery: chunk.searchQuery })
+        }
+        if (chunk.searchResults) {
+          sendSSEData('search_results', {
+            searchResults: chunk.searchResults,
+            searchUsageTime: chunk.searchUsageTime,
+          })
+        }
+        if (chunk.delta) {
+          // 发送增量数据
+          sendSSEData('delta', { m: chunk.delta })
+        }
+        else {
+          // 兼容现有格式，发送完整数据但标记为增量类型
+          sendSSEData('message', {
+            id: chunk.id,
+            reasoning: chunk.reasoning,
+            text: chunk.text,
+            role: chunk.role,
+            finish_reason: chunk.finish_reason,
+          })
+        }
       },
       systemMessage,
       temperature,
@@ -283,11 +331,17 @@ router.post('/chat-process', [auth, limiter], async (req, res) => {
       room,
       chatUuid: uuid,
     })
-    // return the whole response including usage
-    res.write(`\n${JSON.stringify(result.data)}`)
+
+    // 发送最终完成数据
+    if (result && result.status === 'Success') {
+      sendSSEData('complete', result.data)
+    }
+
+    sendSSEEnd()
   }
   catch (error) {
-    res.write(JSON.stringify({ message: error?.message }))
+    sendSSEError(error?.message || 'Unknown error')
+    sendSSEEnd()
   }
   finally {
     res.end()
@@ -299,7 +353,7 @@ router.post('/chat-process', [auth, limiter], async (req, res) => {
       }
 
       if (result.data === undefined)
-      // eslint-disable-next-line no-unsafe-finally
+        // eslint-disable-next-line no-unsafe-finally
         return
 
       if (regenerate && message.options.messageId) {

src/api/index.ts

@@ -1,7 +1,7 @@
 import type { AxiosProgressEvent, GenericAbortSignal } from 'axios'
 import type { AnnounceConfig, AuditConfig, ConfigState, GiftCard, KeyConfig, MailConfig, SearchConfig, SiteConfig, Status, UserInfo, UserPassword, UserPrompt } from '@/components/common/Setting/model'
 import type { SettingsState } from '@/store/modules/user/helper'
-import { useUserStore } from '@/store'
+import { useAuthStore, useUserStore } from '@/store'
 import { get, post } from '@/utils/request'
 
 export function fetchAnnouncement<T = any>() {
@@ -16,6 +16,136 @@ export function fetchChatConfig<T = any>() {
   })
 }
 
+// SSE 事件处理器接口
+interface SSEEventHandlers {
+  onMessage?: (data: any) => void
+  onDelta?: (delta: { reasoning?: string, text?: string }) => void
+  onSearchQuery?: (data: { searchQuery: string }) => void
+  onSearchResults?: (data: { searchResults: any[], searchUsageTime: number }) => void
+  onComplete?: (data: any) => void
+  onError?: (error: string) => void
+  onEnd?: () => void
+}
+
+// 新的 SSE 聊天处理函数
+export function fetchChatAPIProcessSSE(
+  params: {
+    roomId: number
+    uuid: number
+    regenerate?: boolean
+    prompt: string
+    uploadFileKeys?: string[]
+    options?: { conversationId?: string, parentMessageId?: string }
+    signal?: AbortSignal
+  },
+  handlers: SSEEventHandlers,
+): Promise<void> {
+  const userStore = useUserStore()
+  const authStore = useAuthStore()
+
+  const data: Record<string, any> = {
+    roomId: params.roomId,
+    uuid: params.uuid,
+    regenerate: params.regenerate || false,
+    prompt: params.prompt,
+    uploadFileKeys: params.uploadFileKeys,
+    options: params.options,
+    systemMessage: userStore.userInfo.advanced.systemMessage,
+    temperature: userStore.userInfo.advanced.temperature,
+    top_p: userStore.userInfo.advanced.top_p,
+  }
+
+  return new Promise((resolve, reject) => {
+    const baseURL = import.meta.env.VITE_GLOB_API_URL || ''
+    const url = `${baseURL}/api/chat-process`
+
+    fetch(url, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        'Authorization': authStore.token ? `Bearer ${authStore.token}` : '',
+      },
+      body: JSON.stringify(data),
+      signal: params.signal,
+    }).then((response) => {
+      if (!response.ok) {
+        throw new Error(`HTTP error! status: ${response.status}`)
+      }
+
+      const reader = response.body?.getReader()
+      if (!reader) {
+        throw new Error('No reader available')
+      }
+
+      const decoder = new TextDecoder()
+      let buffer = ''
+
+      function readStream(): void {
+        reader!.read().then(({ done, value }) => {
+          if (done) {
+            handlers.onEnd?.()
+            resolve()
+            return
+          }
+
+          buffer += decoder.decode(value, { stream: true })
+          const lines = buffer.split('\n')
+          buffer = lines.pop() || '' // Keep the incomplete line in buffer
+
+          for (const line of lines) {
+            if (line.trim() === '')
+              continue
+
+            if (line.startsWith('event: ')) {
+              // const _eventType = line.substring(7).trim()
+              continue
+            }
+
+            if (line.startsWith('data: ')) {
+              const data = line.substring(6).trim()
+
+              if (data === '[DONE]') {
+                handlers.onEnd?.()
+                resolve()
+                return
+              }
+
+              try {
+                const jsonData = JSON.parse(data)
+
+                // 根据前面的 event 类型分发到不同的处理器
+                if (jsonData.message) {
+                  handlers.onError?.(jsonData.message)
+                }
+                else if (jsonData.searchQuery) {
+                  handlers.onSearchQuery?.(jsonData)
+                }
+                else if (jsonData.searchResults) {
+                  handlers.onSearchResults?.(jsonData)
+                }
+                else if (jsonData.m) {
+                  handlers.onDelta?.(jsonData.m)
+                }
+                else {
+                  handlers.onMessage?.(jsonData)
+                }
+              }
+              catch (e) {
+                console.error('Failed to parse SSE data:', data, e)
+              }
+            }
+          }
+
+          readStream()
+        }).catch(reject)
+      }
+
+      readStream()
+    }).catch(reject)
+  })
+}
+
+// 保持向后兼容的函数（如果需要的话）
 export function fetchChatAPIProcess<T = any>(
   params: {
     roomId: number
@@ -94,7 +224,7 @@ export function fetchLogin<T = any>(username: string, password: string, token?:
 export function fetchLogout<T = any>() {
   return post<T>({
     url: '/user-logout',
-    data: { },
+    data: {},
   })
 }
 
@@ -309,7 +439,7 @@ export function fetchGetChatHistory<T = any>(roomId: number, lastId?: number, al
 export function fetchClearAllChat<T = any>() {
   return post<T>({
     url: '/chat-clear-all',
-    data: { },
+    data: {},
   })
 }