510 lines
14 KiB
TypeScript
510 lines
14 KiB
TypeScript
import { create } from "zustand";
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import { persist } from "zustand/middleware";
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import { type ChatCompletionResponseMessage } from "openai";
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import {
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ControllerPool,
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requestChatStream,
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requestWithPrompt,
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} from "../requests";
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import { isMobileScreen, trimTopic } from "../utils";
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import Locale from "../locales";
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import { showToast } from "../components/ui-lib";
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import { DEFAULT_CONFIG, ModelConfig, ModelType, useAppConfig } from "./config";
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import { createEmptyMask, Mask } from "./mask";
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import { StoreKey } from "../constant";
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export type Message = ChatCompletionResponseMessage & {
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date: string;
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streaming?: boolean;
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isError?: boolean;
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id?: number;
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model?: ModelType;
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};
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export function createMessage(override: Partial<Message>): Message {
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return {
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id: Date.now(),
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date: new Date().toLocaleString(),
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role: "user",
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content: "",
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...override,
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};
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}
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export const ROLES: Message["role"][] = ["user", "system", "assistant"];
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export interface ChatStat {
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tokenCount: number;
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wordCount: number;
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charCount: number;
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}
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export interface ChatSession {
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id: number;
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topic: string;
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memoryPrompt: string;
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messages: Message[];
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stat: ChatStat;
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lastUpdate: number;
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lastSummarizeIndex: number;
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mask: Mask;
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}
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export const DEFAULT_TOPIC = Locale.Store.DefaultTopic;
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export const BOT_HELLO: Message = createMessage({
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role: "assistant",
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content: Locale.Store.BotHello,
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});
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function createEmptySession(): ChatSession {
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return {
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id: Date.now() + Math.random(),
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topic: DEFAULT_TOPIC,
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memoryPrompt: "",
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messages: [],
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stat: {
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tokenCount: 0,
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wordCount: 0,
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charCount: 0,
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},
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lastUpdate: Date.now(),
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lastSummarizeIndex: 0,
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mask: createEmptyMask(),
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};
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}
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interface ChatStore {
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sessions: ChatSession[];
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currentSessionIndex: number;
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globalId: number;
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clearSessions: () => void;
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moveSession: (from: number, to: number) => void;
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selectSession: (index: number) => void;
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newSession: (mask?: Mask) => void;
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deleteSession: (index: number) => void;
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currentSession: () => ChatSession;
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onNewMessage: (message: Message) => void;
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onUserInput: (content: string) => Promise<void>;
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summarizeSession: () => void;
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updateStat: (message: Message) => void;
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updateCurrentSession: (updater: (session: ChatSession) => void) => void;
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updateMessage: (
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sessionIndex: number,
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messageIndex: number,
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updater: (message?: Message) => void,
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) => void;
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resetSession: () => void;
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getMessagesWithMemory: () => Message[];
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getMemoryPrompt: () => Message;
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clearAllData: () => void;
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}
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function countMessages(msgs: Message[]) {
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return msgs.reduce((pre, cur) => pre + cur.content.length, 0);
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}
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export const useChatStore = create<ChatStore>()(
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persist(
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(set, get) => ({
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sessions: [createEmptySession()],
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currentSessionIndex: 0,
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globalId: 0,
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clearSessions() {
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set(() => ({
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sessions: [createEmptySession()],
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currentSessionIndex: 0,
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}));
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},
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selectSession(index: number) {
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set({
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currentSessionIndex: index,
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});
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},
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moveSession(from: number, to: number) {
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set((state) => {
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const { sessions, currentSessionIndex: oldIndex } = state;
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// move the session
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const newSessions = [...sessions];
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const session = newSessions[from];
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newSessions.splice(from, 1);
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newSessions.splice(to, 0, session);
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// modify current session id
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let newIndex = oldIndex === from ? to : oldIndex;
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if (oldIndex > from && oldIndex <= to) {
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newIndex -= 1;
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} else if (oldIndex < from && oldIndex >= to) {
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newIndex += 1;
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}
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return {
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currentSessionIndex: newIndex,
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sessions: newSessions,
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};
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});
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},
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newSession(mask) {
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const session = createEmptySession();
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set(() => ({ globalId: get().globalId + 1 }));
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session.id = get().globalId;
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if (mask) {
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session.mask = { ...mask };
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session.topic = mask.name;
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}
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set((state) => ({
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currentSessionIndex: 0,
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sessions: [session].concat(state.sessions),
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}));
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},
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deleteSession(index) {
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const deletingLastSession = get().sessions.length === 1;
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const deletedSession = get().sessions.at(index);
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if (!deletedSession) return;
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const sessions = get().sessions.slice();
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sessions.splice(index, 1);
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let nextIndex = Math.min(
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get().currentSessionIndex,
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sessions.length - 1,
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);
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if (deletingLastSession) {
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nextIndex = 0;
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sessions.push(createEmptySession());
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}
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// for undo delete action
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const restoreState = {
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currentSessionIndex: get().currentSessionIndex,
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sessions: get().sessions.slice(),
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};
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set(() => ({
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currentSessionIndex: nextIndex,
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sessions,
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}));
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showToast(
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Locale.Home.DeleteToast,
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{
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text: Locale.Home.Revert,
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onClick() {
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set(() => restoreState);
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},
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},
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5000,
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);
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},
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currentSession() {
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let index = get().currentSessionIndex;
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const sessions = get().sessions;
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if (index < 0 || index >= sessions.length) {
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index = Math.min(sessions.length - 1, Math.max(0, index));
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set(() => ({ currentSessionIndex: index }));
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}
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const session = sessions[index];
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return session;
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},
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onNewMessage(message) {
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get().updateCurrentSession((session) => {
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session.lastUpdate = Date.now();
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});
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get().updateStat(message);
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get().summarizeSession();
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},
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async onUserInput(content) {
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const session = get().currentSession();
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const modelConfig = session.mask.modelConfig;
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const userMessage: Message = createMessage({
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role: "user",
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content,
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});
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const botMessage: Message = createMessage({
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role: "assistant",
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streaming: true,
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id: userMessage.id! + 1,
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model: modelConfig.model,
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});
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// get recent messages
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const recentMessages = get().getMessagesWithMemory();
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const sendMessages = recentMessages.concat(userMessage);
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const sessionIndex = get().currentSessionIndex;
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const messageIndex = get().currentSession().messages.length + 1;
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// save user's and bot's message
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get().updateCurrentSession((session) => {
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session.messages.push(userMessage);
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session.messages.push(botMessage);
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});
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// make request
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console.log("[User Input] ", sendMessages);
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requestChatStream(sendMessages, {
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onMessage(content, done) {
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// stream response
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if (done) {
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botMessage.streaming = false;
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botMessage.content = content;
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get().onNewMessage(botMessage);
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ControllerPool.remove(
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sessionIndex,
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botMessage.id ?? messageIndex,
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);
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} else {
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botMessage.content = content;
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set(() => ({}));
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}
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},
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onError(error, statusCode) {
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const isAborted = error.message.includes("aborted");
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if (statusCode === 401) {
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botMessage.content = Locale.Error.Unauthorized;
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} else if (!isAborted) {
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botMessage.content += "\n\n" + Locale.Store.Error;
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}
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botMessage.streaming = false;
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userMessage.isError = !isAborted;
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botMessage.isError = !isAborted;
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set(() => ({}));
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ControllerPool.remove(sessionIndex, botMessage.id ?? messageIndex);
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},
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onController(controller) {
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// collect controller for stop/retry
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ControllerPool.addController(
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sessionIndex,
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botMessage.id ?? messageIndex,
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controller,
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);
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},
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modelConfig: { ...modelConfig },
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});
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},
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getMemoryPrompt() {
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const session = get().currentSession();
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return {
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role: "system",
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content:
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session.memoryPrompt.length > 0
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? Locale.Store.Prompt.History(session.memoryPrompt)
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: "",
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date: "",
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} as Message;
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},
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getMessagesWithMemory() {
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const session = get().currentSession();
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const modelConfig = session.mask.modelConfig;
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const messages = session.messages.filter((msg) => !msg.isError);
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const n = messages.length;
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const context = session.mask.context.slice();
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// long term memory
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if (
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modelConfig.sendMemory &&
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session.memoryPrompt &&
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session.memoryPrompt.length > 0
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) {
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const memoryPrompt = get().getMemoryPrompt();
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context.push(memoryPrompt);
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}
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// get short term and unmemoried long term memory
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const shortTermMemoryMessageIndex = Math.max(
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0,
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n - modelConfig.historyMessageCount,
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);
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const longTermMemoryMessageIndex = session.lastSummarizeIndex;
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const oldestIndex = Math.max(
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shortTermMemoryMessageIndex,
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longTermMemoryMessageIndex,
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);
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const threshold = modelConfig.compressMessageLengthThreshold;
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// get recent messages as many as possible
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const reversedRecentMessages = [];
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for (
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let i = n - 1, count = 0;
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i >= oldestIndex && count < threshold;
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i -= 1
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) {
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const msg = messages[i];
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if (!msg || msg.isError) continue;
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count += msg.content.length;
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reversedRecentMessages.push(msg);
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}
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// concat
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const recentMessages = context.concat(reversedRecentMessages.reverse());
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return recentMessages;
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},
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updateMessage(
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sessionIndex: number,
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messageIndex: number,
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updater: (message?: Message) => void,
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) {
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const sessions = get().sessions;
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const session = sessions.at(sessionIndex);
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const messages = session?.messages;
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updater(messages?.at(messageIndex));
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set(() => ({ sessions }));
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},
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resetSession() {
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get().updateCurrentSession((session) => {
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session.messages = [];
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session.memoryPrompt = "";
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});
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},
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summarizeSession() {
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const session = get().currentSession();
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// should summarize topic after chating more than 50 words
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const SUMMARIZE_MIN_LEN = 50;
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if (
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session.topic === DEFAULT_TOPIC &&
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countMessages(session.messages) >= SUMMARIZE_MIN_LEN
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) {
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requestWithPrompt(session.messages, Locale.Store.Prompt.Topic, {
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model: "gpt-3.5-turbo",
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}).then((res) => {
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get().updateCurrentSession(
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(session) =>
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(session.topic = res ? trimTopic(res) : DEFAULT_TOPIC),
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);
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});
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}
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const modelConfig = session.mask.modelConfig;
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let toBeSummarizedMsgs = session.messages.slice(
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session.lastSummarizeIndex,
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);
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const historyMsgLength = countMessages(toBeSummarizedMsgs);
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if (historyMsgLength > modelConfig?.max_tokens ?? 4000) {
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const n = toBeSummarizedMsgs.length;
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toBeSummarizedMsgs = toBeSummarizedMsgs.slice(
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Math.max(0, n - modelConfig.historyMessageCount),
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);
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}
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// add memory prompt
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toBeSummarizedMsgs.unshift(get().getMemoryPrompt());
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const lastSummarizeIndex = session.messages.length;
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console.log(
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"[Chat History] ",
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toBeSummarizedMsgs,
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historyMsgLength,
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modelConfig.compressMessageLengthThreshold,
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);
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if (
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historyMsgLength > modelConfig.compressMessageLengthThreshold &&
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session.mask.modelConfig.sendMemory
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) {
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requestChatStream(
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toBeSummarizedMsgs.concat({
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role: "system",
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content: Locale.Store.Prompt.Summarize,
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date: "",
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}),
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{
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overrideModel: "gpt-3.5-turbo",
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onMessage(message, done) {
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session.memoryPrompt = message;
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if (done) {
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console.log("[Memory] ", session.memoryPrompt);
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session.lastSummarizeIndex = lastSummarizeIndex;
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}
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},
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onError(error) {
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console.error("[Summarize] ", error);
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},
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},
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);
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}
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},
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updateStat(message) {
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get().updateCurrentSession((session) => {
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session.stat.charCount += message.content.length;
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// TODO: should update chat count and word count
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});
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},
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updateCurrentSession(updater) {
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const sessions = get().sessions;
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const index = get().currentSessionIndex;
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updater(sessions[index]);
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set(() => ({ sessions }));
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},
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clearAllData() {
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localStorage.clear();
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location.reload();
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},
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}),
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{
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name: StoreKey.Chat,
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version: 2,
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migrate(persistedState, version) {
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const state = persistedState as any;
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const newState = JSON.parse(JSON.stringify(state)) as ChatStore;
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if (version < 2) {
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newState.globalId = 0;
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newState.sessions = [];
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const oldSessions = state.sessions;
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for (const oldSession of oldSessions) {
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const newSession = createEmptySession();
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newSession.topic = oldSession.topic;
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newSession.messages = [...oldSession.messages];
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newSession.mask.modelConfig.sendMemory = true;
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newSession.mask.modelConfig.historyMessageCount = 4;
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newSession.mask.modelConfig.compressMessageLengthThreshold = 1000;
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newState.sessions.push(newSession);
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}
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}
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return newState;
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},
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},
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),
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);
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