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import { Chat, initChat, ModelAlias } from "jsr:@mumulhl/duckduckgo-ai-chat@3";
import { events } from "jsr:@lukeed/fetch-event-stream";
import { Hono } from "jsr:@hono/hono";
import { BlankEnv, BlankSchema } from "jsr:@hono/hono/types";
import { SSEStreamingApi, streamSSE } from "jsr:@hono/hono/streaming";
import * as cache from "./../cache.ts";
type Messages = { content: string; role: "user" | "assistant" | "system" }[];
type MessageData = {
id: string;
model: string;
created: number;
role?: "assistant";
message?: string;
};
class DataStream {
id: string;
model: string;
created: number;
choices: {
delta: { content?: string; role?: "assistant" };
}[];
constructor(messageData: MessageData) {
this.id = messageData.id;
this.model = messageData.model;
this.created = messageData.created;
this.choices = [{ delta: { content: messageData.message } }];
if (messageData.role === "assistant") {
this.choices[0].delta.role = "assistant";
}
}
}
async function fetchFull(chat: Chat, messages: Messages) {
let message: Response | undefined;
let text: string = ""; // Initialize text
let messageData: MessageData | undefined;
for (let i = 0; i < messages.length; i += 2) {
text = ""; // Reset the text at each loop to avoid stacking
const content = messages[i].content;
message = await chat.fetch(content);
const stream = events(message as Response);
for await (const event of stream) {
if (!event.data || event.data === "[DONE]") {
break; // End the loop if there's no data or received end message
}
try {
messageData = JSON.parse(event.data) as MessageData;
if (messageData.message === undefined) {
break;
} else {
text += messageData.message; // Append message content
}
} catch (e) {
console.error("Failed to parse JSON:", e);
break; // End the loop on parse error
}
}
const newVqd = message.headers.get("x-vqd-4") as string;
chat.oldVqd = chat.newVqd;
chat.newVqd = newVqd;
chat.messages.push({ content: text, role: "assistant" });
}
const { id, created, model } = messageData as MessageData;
return { id, created, model, text };
}
function fetchStream(chat: Chat, messages: Messages) {
return async (s: SSEStreamingApi) => {
for (let i = 0; i < messages.length; i += 2) {
let text = ""; // Reset the text at each loop to avoid stacking
let messageData: MessageData | undefined;
const content = messages[i].content;
const message = await chat.fetch(content);
const stream = events(message as Response);
for await (const event of stream) {
if (!event.data || event.data === "[DONE]") {
break; // End the loop if there's no data or received end message
}
try {
messageData = JSON.parse(event.data);
if (messageData?.message === undefined) {
break;
} else {
text += messageData.message; // Append message content
}
} catch (e) {
console.error("Failed to parse JSON:", e);
break; // End the loop on parse error
}
if (i === messages.length - 1) {
const dataStream = new DataStream(messageData);
await s.writeSSE({
data: JSON.stringify(dataStream),
});
}
}
const newVqd = message.headers.get("x-vqd-4") as string;
chat.oldVqd = chat.newVqd;
chat.newVqd = newVqd;
chat.messages.push({ content: text, role: "assistant" });
}
if (chat.messages.length >= 4) {
cache.setCache(chat);
cache.setRedoCache(chat);
}
};
}
function chat(app: Hono<BlankEnv, BlankSchema, "/">) {
app.post("/v1/chat/completions", async (c) => {
const body = await c.req.json();
const stream: boolean = body.stream;
const model_name: ModelAlias = body.model;
let messages: Messages = body.messages;
if (messages[0].role === "system") {
messages[1].content = messages[0].content + messages[1].content;
messages = messages.slice(1);
}
let chat = cache.findCache(messages);
if (chat === undefined) {
chat = await initChat(model_name);
} else {
messages = messages.slice(-1);
}
if (stream) {
return streamSSE(c, fetchStream(chat, messages));
}
const { id, model, created, text } = await fetchFull(chat, messages);
if (chat.messages.length >= 4) {
cache.setCache(chat);
cache.setRedoCache(chat);
}
return c.json({
id,
model,
created,
choices: [{
message: { role: "assistant", content: text },
}],
});
});
}
export { chat };
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