@yieldstar/bun-http-server

HTTP routes and middleware for triggering workflows over the network. Designed for Bun's built-in Bun.serve router.

Install

bun add @yieldstar/bun-http-server

createRoutes({ invoker, logger, middleware?, basePath? })

Returns route handlers for POST /trigger and POST /events, compatible with Bun.serve({ routes }).

import { createRoutes } from "@yieldstar/bun-http-server";

Bun.serve({
  port: 8080,
  routes: {
    ...createRoutes({ invoker, logger }),
  },
});

POST /trigger

Accepts an ExecutionEvent JSON body. Runs the middleware chain, then calls invoker.execute. Returns { executionId } with status 202.

POST /events

Accepts { executionId } JSON body. Blocks until the workflow completes by listening on invoker.workflowEndEmitter. Returns the result as JSON, or a serialized error with status 500.

createMiddleware(fn)

Wraps a middleware function for use with createRoutes. Middleware receives (req, event, next, logger).

import { createMiddleware } from "@yieldstar/bun-http-server";

const auth = createMiddleware(async (req, event, next, logger) => {
  const token = req.headers.get("Authorization");
  if (!token) return new Response("Unauthorized", { status: 401 });
  event.context.set("userId", parseToken(token).sub);
  return next();
});

The event.context is a FreezableMap — middleware can call .set() to add entries. After all middleware runs, the context is frozen and becomes a read-only Map inside the workflow.

Middleware executes in order. Each function must either return a Response (to short-circuit) or call next() to continue the chain.