remotion_service/server/index.ts

import Elysia, { t } from "elysia";
import { Document } from "@/srv/types/DocumentSchema";
import { CaptionStyleSchema } from "@/srv/types/CaptionStyleSchema";
import { S3Service } from "@/srv/services/s3";
import { renderCaptionedVideo } from "@/srv/services/render_video";
import {
  cancelRender,
  enqueueRender,
  renderQueue,
  startRenderWorker,
} from "@/srv/services/render_queue";
import { serverConfig } from "@/srv/config";

// Start the BullMQ worker
const worker = startRenderWorker();
console.log(
  `Render worker started (concurrency: ${serverConfig.MAX_CONCURRENT_RENDERS})`,
);

const app = new Elysia({ prefix: "/api" });

app.post(
  "/render",
  async ({ body, set }) => {
    const renderId = body.renderId || crypto.randomUUID();

    // If callbackUrl is provided, enqueue async render
    if (body.callbackUrl) {
      await enqueueRender({
        renderId,
        folder: body.folder,
        videoSrc: body.videoSrc,
        transcription: body.transcription,
        styleConfig: body.styleConfig,
        callbackUrl: body.callbackUrl,
      });

      set.status = 202;
      return { renderId, status: "queued" };
    }

    // Sync fallback (no callbackUrl) — render immediately and return result
    const s3Service = new S3Service("captioned", body.folder);
    const filename = s3Service.getFileName(body.videoSrc);
    const videoUrl = await s3Service.getFileURL(body.videoSrc);

    const res = await renderCaptionedVideo(
      body.transcription,
      videoUrl,
      filename,
      body.styleConfig,
    );

    try {
      const s3OutPath = await s3Service.uploadFile(res.output, filename);
      return { output: s3OutPath };
    } finally {
      await Bun.file(res.output)
        .delete()
        .catch(() => {});
    }
  },
  {
    body: t.Object({
      folder: t.Optional(t.String()),
      renderId: t.Optional(t.String()),
      videoSrc: t.String(),
      transcription: Document,
      styleConfig: t.Optional(CaptionStyleSchema),
      callbackUrl: t.Optional(t.String()),
    }),
  },
);

app.get(
  "/render/:renderId",
  async ({ params }) => {
    const job = await renderQueue.getJob(params.renderId);
    if (!job) {
      return { status: "not_found", renderId: params.renderId };
    }

    const state = await job.getState();
    const progress = typeof job.progress === "number" ? job.progress : 0;

    if (state === "completed") {
      return {
        status: "done",
        renderId: params.renderId,
        progress_pct: 100,
        output_path: job.returnvalue?.outputPath,
        callback_delivered: job.returnvalue?.callbackDelivered ?? false,
      };
    }

    if (state === "failed") {
      return {
        status: "failed",
        renderId: params.renderId,
        error: job.failedReason,
      };
    }

    return {
      status: state, // "waiting", "active", "delayed"
      renderId: params.renderId,
      progress_pct: progress,
    };
  },
  {
    params: t.Object({
      renderId: t.String(),
    }),
  },
);

app.delete(
  "/render/:renderId",
  async ({ params, set }) => {
    const result = await cancelRender(params.renderId);

    if (result.status === "not_found") {
      set.status = 404;
      return result;
    }

    return result;
  },
  {
    params: t.Object({
      renderId: t.String(),
    }),
  },
);

app.get("/render", async () => "Hello");

app.get("/health", async () => {
  return { status: "ok" };
});

app.listen(serverConfig.PORT, () => {
  console.log(
    `Remotion service listening on ${serverConfig.HOST}:${serverConfig.PORT}`,
  );
});

// Graceful shutdown
process.on("SIGTERM", async () => {
  console.log("Shutting down render worker...");
  await worker.close();
  process.exit(0);
});