xcatliu · xcatliu · Nov 23, 2023 · Nov 22, 2023
diff --git a/app/components/History.tsx b/app/components/History.tsx
@@ -45,7 +45,7 @@ export const HistoryItemComp: FC<{ historyIndex: 'current' | number; isActive: b
   historyIndex,
   isActive,
 }) => {
-  const { messages, history, loadHistory } = useContext(ChatContext)!;
+  const { messages, history, loadHistory, abortSendMessage } = useContext(ChatContext)!;
   const { settings } = useContext(SettingsContext)!;
 
   let historyItem: HistoryItem;
@@ -63,7 +63,12 @@ export const HistoryItemComp: FC<{ historyIndex: 'current' | number; isActive: b
       className={classNames('p-4 border-b-[0.5px] relative cursor-default border-gray md:-mx-4 md:px-8', {
         'bg-gray-300 dark:bg-gray-700': isActive,
       })}
-      onClick={() => historyIndex !== 'current' && loadHistory(historyIndex)}
+      onClick={() => {
+        if (historyIndex !== 'current') {
+          abortSendMessage();
+          loadHistory(historyIndex);
+        }
+      }}
     >
       <h3 className="overflow-hidden whitespace-nowrap truncate">{getContentText(historyItem.messages[0])}</h3>
       <p

diff --git a/app/components/Messages.tsx b/app/components/Messages.tsx
@@ -22,7 +22,7 @@ const LOADING_MESSAGE = '正在努力思考...';
 
 export const Messages = () => {
   const { settings } = useContext(SettingsContext)!;
-  let { isLoading, messages, history, historyIndex, startNewChat } = useContext(ChatContext)!;
+  let { isLoading, messages, history, historyIndex, startNewChat, abortSendMessage } = useContext(ChatContext)!;
 
   // 初始化滚动事件
   useEffect(initEventListenerScroll, []);
@@ -52,7 +52,13 @@ export const Messages = () => {
       {messages.length > 1 && (
         <SystemMessage>
           连续对话会加倍消耗 tokens，
-          <a className="text-gray-link" onClick={startNewChat}>
+          <a
+            className="text-gray-link"
+            onClick={() => {
+              abortSendMessage();
+              startNewChat();
+            }}
+          >
             开启新对话
           </a>
         </SystemMessage>

diff --git a/app/components/TextareaForm.tsx b/app/components/TextareaForm.tsx
@@ -17,7 +17,7 @@ export const TextareaForm: FC = () => {
   const { isMobile } = useContext(DeviceContext)!;
   const { isLogged } = useContext(LoginContext)!;
   const { settings } = useContext(SettingsContext)!;
-  const { images, appendImages, sendMessage } = useContext(ChatContext)!;
+  const { images, appendImages, sendMessage, abortSendMessage } = useContext(ChatContext)!;
 
   // 是否正在中文输入
   const [isComposing, setIsComposing] = useState(false);
@@ -43,26 +43,27 @@ export const TextareaForm: FC = () => {
     });
   }, []);
 
-
   /**
    * Handle pasting images into the textarea
    */
-  const handlePaste = useCallback(async (e: React.ClipboardEvent<HTMLTextAreaElement>) => {
-    const items = e.clipboardData?.items;
-    if (items) {
-      for (let i = 0; i < items.length; i++) {
-        if (items[i].type.indexOf('image') === 0) {
-          const file = items[i].getAsFile();
-          if (file == null) {
-            throw new Error("Expected file")
+  const handlePaste = useCallback(
+    async (e: React.ClipboardEvent<HTMLTextAreaElement>) => {
+      const items = e.clipboardData?.items;
+      if (items) {
+        for (let i = 0; i < items.length; i++) {
+          if (items[i].type.indexOf('image') === 0) {
+            const file = items[i].getAsFile();
+            if (file == null) {
+              throw new Error('Expected file');
+            }
+            const image = await readImageFile(file);
+            appendImages(image);
           }
-          const image = await readImageFile(file);
-          appendImages(image);
         }
       }
-    }
-  }, [appendImages]);
-
+    },
+    [appendImages],
+  );
 
   /**
    * 更新 textarea 的 empty 状态
@@ -129,9 +130,10 @@ export const TextareaForm: FC = () => {
       }
       updateTextareaHeight();
       updateIsTextareaEmpty();
+      abortSendMessage();
       await sendMessage(value);
     },
-    [sendMessage, updateTextareaHeight, updateIsTextareaEmpty],
+    [sendMessage, abortSendMessage, updateTextareaHeight, updateIsTextareaEmpty],
   );
 
   /**
@@ -195,7 +197,9 @@ export const TextareaForm: FC = () => {
           {settings.model.includes('vision') && <AttachImage />}
           <div className="flex items-end">
             <input
-              className="px-3 py-2 h-full max-h-16"
+              className={classNames('px-3 py-2 h-10 md:h-16', {
+                'h-16': images.length > 0,
+              })}
               type="submit"
               disabled={isTextareaEmpty && images.length === 0}
               value="发送"
@@ -206,4 +210,3 @@ export const TextareaForm: FC = () => {
     </>
   );
 };
-
diff --git a/app/components/buttons/AttachImageButton.tsx b/app/components/buttons/AttachImageButton.tsx
@@ -5,6 +5,7 @@ import { useContext } from 'react';
 
 import { ChatContext } from '@/context/ChatContext';
 import { LoginContext } from '@/context/LoginContext';
+import { MAX_GPT_VISION_IMAGES } from '@/utils/constants';
 import { readImageFile } from '@/utils/image';
 
 /**
@@ -15,11 +16,11 @@ export const AttachImageButton: FC<{}> = () => {
   const { isLogged } = useContext(LoginContext)!;
 
   return (
-    <div className="h-full max-h-16">
+    <>
       <label
         htmlFor="input-attach-image"
         className={classNames('button-attach-image flex items-center w-10 h-10 md:w-14 md:h-16', {
-          disabled: !isLogged || images.length === 9,
+          disabled: !isLogged || images.length >= MAX_GPT_VISION_IMAGES,
           'justify-center': images.length === 0,
           'justify-end w-14 h-16': images.length > 0,
         })}
@@ -32,7 +33,7 @@ export const AttachImageButton: FC<{}> = () => {
         type="file"
         multiple
         accept="image/jpeg, image/png"
-        disabled={!isLogged || images.length === 9}
+        disabled={!isLogged || images.length >= MAX_GPT_VISION_IMAGES}
         className="hidden"
         onChange={async (e) => {
           const files = e.target.files;
@@ -48,6 +49,6 @@ export const AttachImageButton: FC<{}> = () => {
           e.target.value = '';
         }}
       />
-    </div>
+    </>
   );
 };
diff --git a/app/context/ChatContext.tsx b/app/context/ChatContext.tsx
@@ -2,12 +2,12 @@
 
 import omit from 'lodash.omit';
 import type { FC, ReactNode } from 'react';
-import { createContext, useCallback, useContext, useEffect, useState } from 'react';
+import { createContext, useCallback, useContext, useEffect, useMemo, useState } from 'react';
 
 import { fetchApiChat } from '@/utils/api';
 import { getCache, setCache } from '@/utils/cache';
 import type { ChatResponse, Message, StructuredMessageContentItem } from '@/utils/constants';
-import { MAX_TOKENS, MessageContentType, Model, Role } from '@/utils/constants';
+import { MAX_GPT_VISION_IMAGES, MAX_TOKENS, MessageContentType, Model, Role } from '@/utils/constants';
 import type { ResError } from '@/utils/error';
 import type { ImageProp } from '@/utils/image';
 import { isMessage } from '@/utils/message';
@@ -31,6 +31,7 @@ export interface HistoryItem {
  */
 export const ChatContext = createContext<{
   sendMessage: (content?: string) => Promise<void>;
+  abortSendMessage: () => void;
   isLoading: boolean;
   messages: (Message | ChatResponse)[];
   images: ImageProp[];
@@ -52,6 +53,8 @@ export const ChatProvider: FC<{ children: ReactNode }> = ({ children }) => {
   const [history, setHistory] = useState<HistoryItem[] | undefined>(undefined);
   // 当前选中的对话在 history 中的 index，empty 表示未选中，current 表示选中的是当前对话
   const [historyIndex, setHistoryIndex] = useState<'empty' | 'current' | number>('empty');
+  // 控制请求中断
+  const [abortController, setAbortController] = useState<AbortController>();
 
   // 页面加载后从 cache 中读取 history 和 messages
   // 如果 messages 不为空，则将最近的一条消息写入 history
@@ -165,6 +168,9 @@ export const ChatProvider: FC<{ children: ReactNode }> = ({ children }) => {
         if (settings.systemMessage) {
           fetchApiChatMessages.unshift(settings.systemMessage);
         }
+        // 创建一个新的 abortController
+        const newAbortController = new AbortController();
+        setAbortController(newAbortController);
         // TODO 收到完整消息后，写入 cache 中
         const fullContent = await fetchApiChat({
           // gpt-4-vision-preview 有个 bug：不传 max_tokens 时，会中断消息
@@ -184,6 +190,7 @@ export const ChatProvider: FC<{ children: ReactNode }> = ({ children }) => {
               scrollToBottom();
             }
           },
+          signal: newAbortController.signal,
         });
 
         // 收到完整消息后，重新设置 messages
@@ -194,7 +201,11 @@ export const ChatProvider: FC<{ children: ReactNode }> = ({ children }) => {
         if (gapToBottom() <= 72 && !getIsScrolling()) {
           scrollToBottom();
         }
-      } catch (e) {
+      } catch (e: any) {
+        // 如果是调用 abortController.abort() 捕获到的 error 则不处理
+        if (e.name === 'AbortError') {
+          return;
+        }
         // 发生错误时，展示错误消息
         setIsLoading(false);
         setMessages([
@@ -203,9 +214,16 @@ export const ChatProvider: FC<{ children: ReactNode }> = ({ children }) => {
         ]);
       }
     },
-    [settings, messages, images, history, historyIndex],
+    [settings, messages, images, history, historyIndex, setAbortController],
   );
 
+  /**
+   * 中断请求
+   */
+  const abortSendMessage = useCallback(() => {
+    abortController?.abort();
+  }, [abortController]);
+
   /**
    * 加载聊天记录
    */
@@ -258,7 +276,8 @@ export const ChatProvider: FC<{ children: ReactNode }> = ({ children }) => {
         setCache('history', newHistory);
         setMessages([]);
         setCache('messages', []);
-        setHistoryIndex(index);
+        // 此时因为将 current 进行归档了，所以需要 +1
+        setHistoryIndex(index + 1);
         setSettings({
           model: newModel,
         });
@@ -339,9 +358,9 @@ export const ChatProvider: FC<{ children: ReactNode }> = ({ children }) => {
   const appendImages = useCallback(
     (...newImages: ImageProp[]) => {
       const finalImages = [...images, ...newImages];
-      if (finalImages.length > 9) {
-        setImages(finalImages.slice(0, 9));
-        alert('最多只能发送九张图片，超出的图片已删除');
+      if (finalImages.length > MAX_GPT_VISION_IMAGES) {
+        setImages(finalImages.slice(0, MAX_GPT_VISION_IMAGES));
+        alert(`最多只能发送 ${MAX_GPT_VISION_IMAGES} 张图片，超出的图片已删除`);
         return;
       }
       setImages(finalImages);
@@ -362,6 +381,7 @@ export const ChatProvider: FC<{ children: ReactNode }> = ({ children }) => {
     <ChatContext.Provider
       value={{
         sendMessage,
+        abortSendMessage,
         isLoading,
         messages,
         images,

diff --git a/app/utils/api.ts b/app/utils/api.ts
@@ -10,17 +10,23 @@ import { stream2string } from './stream';
  */
 export const fetchApiChat = async ({
   onMessage,
+  signal,
   ...chatRequest
 }: {
   /**
    * 接受 stream 消息的回调函数
    */
   onMessage?: (content: string) => void;
+  /**
+   * 控制请求中断的 AbortSignal
+   */
+  signal?: AbortSignal;
 } & Partial<ChatRequest>) => {
   const fetchResult = await fetch('/api/chat', {
     method: HttpMethod.POST,
     headers: HttpHeaderJson,
     body: JSON.stringify(chatRequest),
+    signal,
   });
 
   // 如果返回错误，则直接抛出错误

diff --git a/app/utils/constants.ts b/app/utils/constants.ts
@@ -19,6 +19,11 @@ export const HttpHeaderJson = {
  */
 export const FULL_SPACE = '　';
 
+/**
+ * 使用 gpt-4-vision 时单次可传输的最多图片数量
+ */
+export const MAX_GPT_VISION_IMAGES = 9;
+
 /**
  * 角色
  * 参考 https://github.com/openai/openai-node/blob/master/api.ts