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Use Convex + Hono to power chat app #3

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Use Convex + Hono to power chat app #3

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62 changes: 15 additions & 47 deletions convex/http.ts
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Original file line number Diff line number Diff line change
@@ -1,11 +1,20 @@
import { httpRouter } from "convex/server";
import { httpAction } from "./_generated/server";
import { Hono } from "hono";
import { HonoWithConvex, HttpRouterWithHono } from "convex-helpers/server/hono";
import { ActionCtx } from "./_generated/server";
import { cors } from "hono/cors";
import { openai } from "@ai-sdk/openai";
import { streamText } from "ai";

export const chat = httpAction(async (ctx, req) => {
const app: HonoWithConvex<ActionCtx> = new Hono();

// See the [guide on Stack](https://stack.convex.dev/hono-with-convex)
// for tips on using Hono for HTTP endpoints.

app.use("/api/*", cors());

app.post("/api/chat", async (c) => {
// Extract the `messages` from the body of the request
const { messages } = await req.json();
const { messages } = await c.req.json();

// Call the language model
const result = await streamText({
Expand All @@ -19,48 +28,7 @@ export const chat = httpAction(async (ctx, req) => {
});

// Respond with the stream
return result.toAIStreamResponse({
headers: {
// e.g. https://mywebsite.com, configured on your Convex dashboard
"Access-Control-Allow-Origin": "*",
Vary: "origin",
},
});
});

const http = httpRouter();

http.route({
path: "/api/chat",
method: "POST",
handler: chat,
});

http.route({
path: "/api/chat",
method: "OPTIONS",
handler: httpAction(async (_, request) => {
// Make sure the necessary headers are present
// for this to be a valid pre-flight request
const headers = request.headers;
if (
headers.get("Origin") !== null &&
headers.get("Access-Control-Request-Method") !== null &&
headers.get("Access-Control-Request-Headers") !== null
) {
return new Response(null, {
headers: new Headers({
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Methods": "POST",
"Access-Control-Allow-Headers": "Content-Type, Digest",
"Access-Control-Max-Age": "86400",
}),
});
} else {
return new Response();
}
}),
return result.toAIStreamResponse();
});

// Convex expects the router to be the default export of `convex/http.js`.
export default http;
export default new HttpRouterWithHono(app);
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