feat: add http gateway (#3)

packages/server/src/gateway/gateway.ts

@@ -0,0 +1,34 @@
+import { FastifyPluginAsync } from 'fastify';
+import FastifyReplyFrom from '@fastify/reply-from';
+import { escape } from 'querystring';
+import { Runtime } from '../runtime/runtime.js';
+
+type Options = {
+  runtime: Runtime;
+};
+
+const gateway: FastifyPluginAsync<Options> = async (fastify, { runtime }) => {
+  await fastify.register(FastifyReplyFrom, {
+    http: {},
+  });
+
+  fastify.all('/gateway/*', (req, res) => {
+    const [runId, ...pathSegments] = (req.params as any)['*'].split('/').filter(Boolean);
+    const run = runtime.runner.getInstance(runId);
+    if (!run) {
+      res.statusCode = 404;
+      res.send({ error: 'Run not found' });
+      return;
+    }
+    const socketPath = run.run?.httpGatewaySocket;
+    if (!socketPath) {
+      res.statusCode = 404;
+      res.send({ error: 'No socket path to run' });
+      return;
+    }
+    const path = pathSegments.join('/');
+    res.from(`unix+http://${escape(socketPath)}/${path}`);
+  });
+};
+
+export { gateway };