feat: support steaming

app/api/chat-messages/route.ts

 import { type NextRequest } from 'next/server'
 import { client, getInfo } from '@/app/api/utils/common'
-import { OpenAIStream } from '@/app/api/utils/stream'
 
 export async function POST(request: NextRequest) {
   const body = await request.json()
@@ -12,6 +11,5 @@ export async function POST(request: NextRequest) {
   } = body
   const { user } = getInfo(request)
   const res = await client.createChatMessage(inputs, query, user, responseMode, conversationId)
-  const stream = await OpenAIStream(res as any)
-  return new Response(stream as any)
+  return new Response(res.data as any)
 }

app/api/utils/stream.ts

-export async function OpenAIStream(res: { body: any }) {
-  const reader = res.body.getReader()
-
-  const stream = new ReadableStream({
-    // https://developer.mozilla.org/en-US/docs/Web/API/Streams_API/Using_readable_streams
-    // https://github.com/whichlight/chatgpt-api-streaming/blob/master/pages/api/OpenAIStream.ts
-    start(controller) {
-      return pump()
-      function pump() {
-        return reader.read().then(({ done, value }: any) => {
-          // When no more data needs to be consumed, close the stream
-          if (done) {
-            controller.close()
-            return
-          }
-          // Enqueue the next data chunk into our target stream
-          controller.enqueue(value)
-          return pump()
-        })
-      }
-    },
-  })
-
-  return stream
-}

package.json

@@ -26,7 +26,7 @@
     "axios": "^1.3.5",
     "classnames": "^2.3.2",
     "copy-to-clipboard": "^3.3.3",
-    "dify-client": "1.0.3",
+    "dify-client": "2.0.0",
     "eslint": "8.36.0",
     "eslint-config-next": "13.2.4",
     "eventsource-parser": "^1.0.0",

service/base.ts

@@ -64,7 +64,7 @@ const handleStream = (response: any, onData: IOnData, onCompleted?: IOnCompleted
         lines.forEach((message) => {
           if (!message)
             return
-          bufferObj = JSON.parse(message) // remove data: and parse as json
+          bufferObj = JSON.parse(message.substring(6)) // remove data: and parse as json
           onData(unicodeToChar(bufferObj.answer), isFirstMessage, {
             conversationId: bufferObj.conversation_id,
             messageId: bufferObj.id,