feat(assistant-steps): only open last comp

src/app/api/chat/route.ts

@@ -5,6 +5,10 @@ import SearchAgent from '@/lib/agents/search';
 import SessionManager from '@/lib/session';
 import { ChatTurnMessage } from '@/lib/types';
 import { SearchSources } from '@/lib/agents/search/types';
+import db from '@/lib/db';
+import { eq } from 'drizzle-orm';
+import { chats } from '@/lib/db/schema';
+import UploadManager from '@/lib/uploads/manager';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
@@ -64,6 +68,38 @@ const safeValidateBody = (data: unknown) => {
   };
 };
 
+const ensureChatExists = async (input: {
+  id: string;
+  sources: SearchSources[];
+  query: string;
+  fileIds: string[];
+}) => {
+  try {
+    const exists = await db.query.chats
+      .findFirst({
+        where: eq(chats.id, input.id),
+      })
+      .execute();
+
+    if (!exists) {
+      await db.insert(chats).values({
+        id: input.id,
+        createdAt: new Date().toISOString(),
+        sources: input.sources,
+        title: input.query,
+        files: input.fileIds.map((id) => {
+          return {
+            fileId: id,
+            name: UploadManager.getFile(id)?.name || 'Uploaded File',
+          };
+        }),
+      });
+    }
+  } catch (err) {
+    console.error('Failed to check/save chat:', err);
+  }
+};
+
 export const POST = async (req: Request) => {
   try {
     const reqBody = (await req.json()) as Body;
@@ -120,29 +156,9 @@ export const POST = async (req: Request) => {
     const writer = responseStream.writable.getWriter();
     const encoder = new TextEncoder();
 
-    let receivedMessage = '';
-
-    session.addListener('data', (data: any) => {
-      if (data.type === 'response') {
-        writer.write(
-          encoder.encode(
-            JSON.stringify({
-              type: 'message',
-              data: data.data,
-            }) + '\n',
-          ),
-        );
-        receivedMessage += data.data;
-      } else if (data.type === 'sources') {
-        writer.write(
-          encoder.encode(
-            JSON.stringify({
-              type: 'sources',
-              data: data.data,
-            }) + '\n',
-          ),
-        );
-      } else if (data.type === 'block') {
+    const disconnect = session.subscribe((event: string, data: any) => {
+      if (event === 'data') {
+        if (data.type === 'block') {
           writer.write(
             encoder.encode(
               JSON.stringify({
@@ -170,9 +186,7 @@ export const POST = async (req: Request) => {
             ),
           );
         }
-    });
-
-    session.addListener('end', () => {
+      } else if (event === 'end') {
         writer.write(
           encoder.encode(
             JSON.stringify({
@@ -182,9 +196,7 @@ export const POST = async (req: Request) => {
         );
         writer.close();
         session.removeAllListeners();
-    });
-
-    session.addListener('error', (data: any) => {
+      } else if (event === 'error') {
         writer.write(
           encoder.encode(
             JSON.stringify({
@@ -195,11 +207,14 @@ export const POST = async (req: Request) => {
         );
         writer.close();
         session.removeAllListeners();
+      }
     });
 
     agent.searchAsync(session, {
       chatHistory: history,
       followUp: message.content,
+      chatId: body.message.chatId,
+      messageId: body.message.messageId,
       config: {
         llm,
         embedding: embedding,
@@ -209,7 +224,17 @@ export const POST = async (req: Request) => {
       },
     });
 
-    /*  handleHistorySave(message, humanMessageId, body.focusMode, body.files); */
+    ensureChatExists({
+      id: body.message.chatId,
+      sources: body.sources as SearchSources[],
+      fileIds: body.files,
+      query: body.message.content,
+    });
+
+    req.signal.addEventListener('abort', () => {
+      disconnect();
+      writer.close();
+    });
 
     return new Response(responseStream.readable, {
       headers: {

src/app/api/reconnect/[id]/route.ts

@@ -0,0 +1,93 @@
+import SessionManager from '@/lib/session';
+
+export const POST = async (
+  req: Request,
+  { params }: { params: Promise<{ id: string }> },
+) => {
+  try {
+    const { id } = await params;
+
+    const session = SessionManager.getSession(id);
+
+    if (!session) {
+      return Response.json({ message: 'Session not found' }, { status: 404 });
+    }
+
+    const responseStream = new TransformStream();
+    const writer = responseStream.writable.getWriter();
+    const encoder = new TextEncoder();
+
+    const disconnect = session.subscribe((event, data) => {
+      if (event === 'data') {
+        if (data.type === 'block') {
+          writer.write(
+            encoder.encode(
+              JSON.stringify({
+                type: 'block',
+                block: data.block,
+              }) + '\n',
+            ),
+          );
+        } else if (data.type === 'updateBlock') {
+          writer.write(
+            encoder.encode(
+              JSON.stringify({
+                type: 'updateBlock',
+                blockId: data.blockId,
+                patch: data.patch,
+              }) + '\n',
+            ),
+          );
+        } else if (data.type === 'researchComplete') {
+          writer.write(
+            encoder.encode(
+              JSON.stringify({
+                type: 'researchComplete',
+              }) + '\n',
+            ),
+          );
+        }
+      } else if (event === 'end') {
+        writer.write(
+          encoder.encode(
+            JSON.stringify({
+              type: 'messageEnd',
+            }) + '\n',
+          ),
+        );
+        writer.close();
+        disconnect();
+      } else if (event === 'error') {
+        writer.write(
+          encoder.encode(
+            JSON.stringify({
+              type: 'error',
+              data: data.data,
+            }) + '\n',
+          ),
+        );
+        writer.close();
+        disconnect();
+      }
+    });
+
+    req.signal.addEventListener('abort', () => {
+      disconnect();
+      writer.close();
+    });
+
+    return new Response(responseStream.readable, {
+      headers: {
+        'Content-Type': 'text/event-stream',
+        Connection: 'keep-alive',
+        'Cache-Control': 'no-cache, no-transform',
+      },
+    });
+  } catch (err) {
+    console.error('Error in reconnecting to session stream: ', err);
+    return Response.json(
+      { message: 'An error has occurred.' },
+      { status: 500 },
+    );
+  }
+};

src/components/AssistantSteps.tsx

@@ -54,17 +54,21 @@ const getStepTitle = (
 const AssistantSteps = ({
   block,
   status,
+  isLast,
 }: {
   block: ResearchBlock;
   status: 'answering' | 'completed' | 'error';
+  isLast: boolean;
 }) => {
-  const [isExpanded, setIsExpanded] = useState(true);
+  const [isExpanded, setIsExpanded] = useState(
+    isLast && status === 'answering' ? true : false,
+  );
   const { researchEnded, loading } = useChat();
 
   useEffect(() => {
-    if (researchEnded) {
+    if (researchEnded && isLast) {
       setIsExpanded(false);
-    } else if (status === 'answering') {
+    } else if (status === 'answering' && isLast) {
       setIsExpanded(true);
     }
   }, [researchEnded, status]);

src/components/MessageBox.tsx

@@ -131,6 +131,7 @@ const MessageBox = ({
                 <AssistantSteps
                   block={researchBlock}
                   status={section.message.status}
+                  isLast={isLast}
                 />
               </div>
             ))}

src/lib/agents/search/index.ts

@@ -4,9 +4,53 @@ import { classify } from './classifier';
 import Researcher from './researcher';
 import { getWriterPrompt } from '@/lib/prompts/search/writer';
 import { WidgetExecutor } from './widgets';
+import db from '@/lib/db';
+import { chats, messages } from '@/lib/db/schema';
+import { and, eq, gt } from 'drizzle-orm';
+import { TextBlock } from '@/lib/types';
 
 class SearchAgent {
   async searchAsync(session: SessionManager, input: SearchAgentInput) {
+    const exists = await db.query.messages.findFirst({
+      where: and(
+        eq(messages.chatId, input.chatId),
+        eq(messages.messageId, input.messageId),
+      ),
+    });
+
+    if (!exists) {
+      await db.insert(messages).values({
+        chatId: input.chatId,
+        messageId: input.messageId,
+        backendId: session.id,
+        query: input.followUp,
+        createdAt: new Date().toISOString(),
+        status: 'answering',
+        responseBlocks: [],
+      });
+    } else {
+      await db
+        .delete(messages)
+        .where(
+          and(eq(messages.chatId, input.chatId), gt(messages.id, exists.id)),
+        )
+        .execute();
+      await db
+        .update(messages)
+        .set({
+          status: 'answering',
+          backendId: session.id,
+          responseBlocks: [],
+        })
+        .where(
+          and(
+            eq(messages.chatId, input.chatId),
+            eq(messages.messageId, input.messageId),
+          ),
+        )
+        .execute();
+    }
+
     const classification = await classify({
       chatHistory: input.chatHistory,
       enabledSources: input.config.sources,
@@ -85,18 +129,41 @@ class SearchAgent {
       ],
     });
 
-    let accumulatedText = '';
+    const block: TextBlock = {
+      id: crypto.randomUUID(),
+      type: 'text',
+      data: '',
+    };
+
+    session.emitBlock(block);
 
     for await (const chunk of answerStream) {
-      accumulatedText += chunk.contentChunk;
+      block.data += chunk.contentChunk;
 
-      session.emit('data', {
-        type: 'response',
-        data: chunk.contentChunk,
-      });
+      session.updateBlock(block.id, [
+        {
+          op: 'replace',
+          path: '/data',
+          value: block.data,
+        },
+      ]);
     }
 
     session.emit('end', {});
+
+    await db
+      .update(messages)
+      .set({
+        status: 'completed',
+        responseBlocks: session.getAllBlocks(),
+      })
+      .where(
+        and(
+          eq(messages.chatId, input.chatId),
+          eq(messages.messageId, input.messageId),
+        ),
+      )
+      .execute();
   }
 }
 

src/lib/agents/search/researcher/index.ts

@@ -206,8 +206,9 @@ class Researcher {
       })
       .filter((r) => r !== undefined);
 
-    session.emit('data', {
-      type: 'sources',
+    session.emitBlock({
+      id: crypto.randomUUID(),
+      type: 'source',
       data: filteredSearchResults,
     });
 

src/lib/agents/search/types.ts

@@ -18,6 +18,8 @@ export type SearchAgentInput = {
   chatHistory: ChatTurnMessage[];
   followUp: string;
   config: SearchAgentConfig;
+  chatId: string;
+  messageId: string;
 };
 
 export type WidgetInput = {

src/lib/db/schema.ts

@@ -1,6 +1,7 @@
 import { sql } from 'drizzle-orm';
 import { text, integer, sqliteTable } from 'drizzle-orm/sqlite-core';
 import { Block } from '../types';
+import { SearchSources } from '../agents/search/types';
 
 export const messages = sqliteTable('messages', {
   id: integer('id').primaryKey(),
@@ -26,7 +27,11 @@ export const chats = sqliteTable('chats', {
   id: text('id').primaryKey(),
   title: text('title').notNull(),
   createdAt: text('createdAt').notNull(),
-  focusMode: text('focusMode').notNull(),
+  sources: text('sources', {
+    mode: 'json',
+  })
+    .$type<SearchSources[]>()
+    .default(sql`'[]'`),
   files: text('files', { mode: 'json' })
     .$type<DBFile[]>()
     .default(sql`'[]'`),

src/lib/hooks/useChat.tsx

@@ -401,6 +401,50 @@ export const ChatProvider = ({ children }: { children: React.ReactNode }) => {
     });
   }, [messages]);
 
+  const checkReconnect = async () => {
+    if (messages.length > 0) {
+      const lastMsg = messages[messages.length - 1];
+
+      if (lastMsg.status === 'answering') {
+        setLoading(true);
+        setResearchEnded(false);
+        setMessageAppeared(false);
+
+        const res = await fetch(`/api/reconnect/${lastMsg.backendId}`, {
+          method: 'POST',
+        });
+
+        if (!res.body) throw new Error('No response body');
+
+        const reader = res.body?.getReader();
+        const decoder = new TextDecoder('utf-8');
+
+        let partialChunk = '';
+
+        const messageHandler = getMessageHandler(lastMsg);
+
+        while (true) {
+          const { value, done } = await reader.read();
+          if (done) break;
+
+          partialChunk += decoder.decode(value, { stream: true });
+
+          try {
+            const messages = partialChunk.split('\n');
+            for (const msg of messages) {
+              if (!msg.trim()) continue;
+              const json = JSON.parse(msg);
+              messageHandler(json);
+            }
+            partialChunk = '';
+          } catch (error) {
+            console.warn('Incomplete JSON, waiting for next chunk...');
+          }
+        }
+      }
+    }
+  };
+
   useEffect(() => {
     checkConfig(
       setChatModelProvider,
@@ -454,13 +498,22 @@ export const ChatProvider = ({ children }: { children: React.ReactNode }) => {
   }, [messages]);
 
   useEffect(() => {
-    if (isMessagesLoaded && isConfigReady) {
+    if (isMessagesLoaded && isConfigReady && newChatCreated) {
       setIsReady(true);
       console.debug(new Date(), 'app:ready');
+    } else if (isMessagesLoaded && isConfigReady && !newChatCreated) {
+      checkReconnect()
+        .then(() => {
+          setIsReady(true);
+          console.debug(new Date(), 'app:ready');
+        })
+        .catch((err) => {
+          console.error('Error during reconnect:', err);
+        });
     } else {
       setIsReady(false);
     }
-  }, [isMessagesLoaded, isConfigReady]);
+  }, [isMessagesLoaded, isConfigReady, newChatCreated]);
 
   const rewrite = (messageId: string) => {
     const index = messages.findIndex((msg) => msg.messageId === messageId);
@@ -488,38 +541,10 @@ export const ChatProvider = ({ children }: { children: React.ReactNode }) => {
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [isConfigReady, isReady, initialMessage]);
 
-  const sendMessage: ChatContext['sendMessage'] = async (
-    message,
-    messageId,
-    rewrite = false,
-  ) => {
-    if (loading || !message) return;
-    setLoading(true);
-    setResearchEnded(false);
-    setMessageAppeared(false);
+  const getMessageHandler = (message: Message) => {
+    const messageId = message.messageId;
 
-    if (messages.length <= 1) {
-      window.history.replaceState(null, '', `/c/${chatId}`);
-    }
-
-    messageId = messageId ?? crypto.randomBytes(7).toString('hex');
-    const backendId = crypto.randomBytes(20).toString('hex');
-
-    const newMessage: Message = {
-      messageId,
-      chatId: chatId!,
-      backendId,
-      query: message,
-      responseBlocks: [],
-      status: 'answering',
-      createdAt: new Date(),
-    };
-
-    setMessages((prevMessages) => [...prevMessages, newMessage]);
-
-    const receivedTextRef = { current: '' };
-
-    const messageHandler = async (data: any) => {
+    return async (data: any) => {
       if (data.type === 'error') {
         toast.error(data.data);
         setLoading(false);
@@ -536,7 +561,7 @@ export const ChatProvider = ({ children }: { children: React.ReactNode }) => {
       if (data.type === 'researchComplete') {
         setResearchEnded(true);
         if (
-          newMessage.responseBlocks.find(
+          message.responseBlocks.find(
             (b) => b.type === 'source' && b.data.length > 0,
           )
         ) {
@@ -556,6 +581,13 @@ export const ChatProvider = ({ children }: { children: React.ReactNode }) => {
             return msg;
           }),
         );
+
+        if (
+          (data.block.type === 'source' && data.block.data.length > 0) ||
+          data.block.type === 'text'
+        ) {
+          setMessageAppeared(true);
+        }
       }
 
       if (data.type === 'updateBlock') {
@@ -577,72 +609,19 @@ export const ChatProvider = ({ children }: { children: React.ReactNode }) => {
         );
       }
 
-      if (data.type === 'sources') {
-        const sourceBlock: Block = {
-          id: crypto.randomBytes(7).toString('hex'),
-          type: 'source',
-          data: data.data,
-        };
-
-        setMessages((prev) =>
-          prev.map((msg) => {
-            if (msg.messageId === messageId) {
-              return {
-                ...msg,
-                responseBlocks: [...msg.responseBlocks, sourceBlock],
-              };
-            }
-            return msg;
-          }),
-        );
-        if (data.data.length > 0) {
-          setMessageAppeared(true);
-        }
-      }
-
-      if (data.type === 'message') {
-        receivedTextRef.current += data.data;
-
-        setMessages((prev) =>
-          prev.map((msg) => {
-            if (msg.messageId === messageId) {
-              const existingTextBlockIndex = msg.responseBlocks.findIndex(
-                (b) => b.type === 'text',
-              );
-
-              if (existingTextBlockIndex >= 0) {
-                const updatedBlocks = [...msg.responseBlocks];
-                const existingBlock = updatedBlocks[
-                  existingTextBlockIndex
-                ] as Block & { type: 'text' };
-                updatedBlocks[existingTextBlockIndex] = {
-                  ...existingBlock,
-                  data: existingBlock.data + data.data,
-                };
-                return { ...msg, responseBlocks: updatedBlocks };
-              } else {
-                const textBlock: Block = {
-                  id: crypto.randomBytes(7).toString('hex'),
-                  type: 'text',
-                  data: data.data,
-                };
-                return {
-                  ...msg,
-                  responseBlocks: [...msg.responseBlocks, textBlock],
-                };
-              }
-            }
-            return msg;
-          }),
-        );
-        setMessageAppeared(true);
-      }
-
       if (data.type === 'messageEnd') {
+        const currentMsg = messagesRef.current.find(
+          (msg) => msg.messageId === messageId,
+        );
+
         const newHistory: [string, string][] = [
           ...chatHistory,
-          ['human', message],
-          ['assistant', receivedTextRef.current],
+          ['human', message.query],
+          [
+            'assistant',
+            currentMsg?.responseBlocks.find((b) => b.type === 'text')?.data ||
+              '',
+          ],
         ];
 
         setChatHistory(newHistory);
@@ -672,9 +651,6 @@ export const ChatProvider = ({ children }: { children: React.ReactNode }) => {
         }
 
         // Check if there are sources and no suggestions
-        const currentMsg = messagesRef.current.find(
-          (msg) => msg.messageId === messageId,
-        );
 
         const hasSourceBlocks = currentMsg?.responseBlocks.some(
           (block) => block.type === 'source' && block.data.length > 0,
@@ -705,6 +681,36 @@ export const ChatProvider = ({ children }: { children: React.ReactNode }) => {
         }
       }
     };
+  };
+
+  const sendMessage: ChatContext['sendMessage'] = async (
+    message,
+    messageId,
+    rewrite = false,
+  ) => {
+    if (loading || !message) return;
+    setLoading(true);
+    setResearchEnded(false);
+    setMessageAppeared(false);
+
+    if (messages.length <= 1) {
+      window.history.replaceState(null, '', `/c/${chatId}`);
+    }
+
+    messageId = messageId ?? crypto.randomBytes(7).toString('hex');
+    const backendId = crypto.randomBytes(20).toString('hex');
+
+    const newMessage: Message = {
+      messageId,
+      chatId: chatId!,
+      backendId,
+      query: message,
+      responseBlocks: [],
+      status: 'answering',
+      createdAt: new Date(),
+    };
+
+    setMessages((prevMessages) => [...prevMessages, newMessage]);
 
     const messageIndex = messages.findIndex((m) => m.messageId === messageId);
 
@@ -746,6 +752,8 @@ export const ChatProvider = ({ children }: { children: React.ReactNode }) => {
 
     let partialChunk = '';
 
+    const messageHandler = getMessageHandler(newMessage);
+
     while (true) {
       const { value, done } = await reader.read();
       if (done) break;

src/lib/session.ts

@@ -2,8 +2,14 @@ import { EventEmitter } from 'stream';
 import { applyPatch } from 'rfc6902';
 import { Block } from './types';
 
+const sessions =
+  (global as any)._sessionManagerSessions || new Map<string, SessionManager>();
+if (process.env.NODE_ENV !== 'production') {
+  (global as any)._sessionManagerSessions = sessions;
+}
+
 class SessionManager {
-  private static sessions = new Map<string, SessionManager>();
+  private static sessions: Map<string, SessionManager> = sessions;
   readonly id: string;
   private blocks = new Map<string, Block>();
   private events: { event: string; data: any }[] = [];
@@ -67,15 +73,32 @@ class SessionManager {
     }
   }
 
-  addListener(event: string, listener: (data: any) => void) {
-    this.emitter.addListener(event, listener);
+  getAllBlocks() {
+    return Array.from(this.blocks.values());
   }
 
-  replay() {
-    for (const { event, data } of this.events) {
-      /* Using emitter directly to avoid infinite loop */
-      this.emitter.emit(event, data);
+  subscribe(listener: (event: string, data: any) => void): () => void {
+    const currentEventsLength = this.events.length;
+
+    const handler = (event: string) => (data: any) => listener(event, data);
+    const dataHandler = handler('data');
+    const endHandler = handler('end');
+    const errorHandler = handler('error');
+
+    this.emitter.on('data', dataHandler);
+    this.emitter.on('end', endHandler);
+    this.emitter.on('error', errorHandler);
+
+    for (let i = 0; i < currentEventsLength; i++) {
+      const { event, data } = this.events[i];
+      listener(event, data);
     }
+
+    return () => {
+      this.emitter.off('data', dataHandler);
+      this.emitter.off('end', endHandler);
+      this.emitter.off('error', errorHandler);
+    };
   }
 }