diff --git a/16-containers-do/README.md b/16-containers-do/README.md new file mode 100644 index 0000000..f187578 --- /dev/null +++ b/16-containers-do/README.md @@ -0,0 +1,24 @@ +# Containers-backed Durable Objects Example + +A Python Worker that proxies requests to a [container-backed Durable Object](https://developers.cloudflare.com/containers/). The container runs a Pillow-based image generation server — every request returns a random abstract art PNG. + +## Architecture + +``` +Request → Python Worker → Durable Object → Container (Pillow image server on port 8080) +``` + +The Worker forwards all requests to a single container-backed DO instance. The DO starts the container on first access and proxies HTTP to it. + +## Usage + +```sh +# Generate a random 512x512 image +curl -o art.png https://.workers.dev/ + +# Custom size +curl -o art.png "https://.workers.dev/?w=800&h=600" + +# Reproducible output with a seed +curl -o art.png "https://.workers.dev/?seed=42" +``` diff --git a/16-containers-do/container/Dockerfile b/16-containers-do/container/Dockerfile new file mode 100644 index 0000000..e3d83bb --- /dev/null +++ b/16-containers-do/container/Dockerfile @@ -0,0 +1,9 @@ +FROM python:3.12-slim + +WORKDIR /app +RUN pip install --no-cache-dir pillow +COPY server.py . + +EXPOSE 8080 + +CMD ["python", "-u", "server.py"] diff --git a/16-containers-do/container/server.py b/16-containers-do/container/server.py new file mode 100644 index 0000000..a55b306 --- /dev/null +++ b/16-containers-do/container/server.py @@ -0,0 +1,85 @@ +"""Image generation server that runs inside a Cloudflare Container. + +Generates random abstract art using Pillow and serves it over HTTP. +""" + +from http.server import HTTPServer, BaseHTTPRequestHandler +from io import BytesIO +from urllib.parse import parse_qs, urlparse +import random + +from PIL import Image, ImageDraw, ImageFilter + + +def generate_image(width=512, height=512, seed=None): + """Generate a random abstract art image.""" + if seed is not None: + random.seed(seed) + + img = Image.new("RGB", (width, height), _random_color(pastel=True)) + draw = ImageDraw.Draw(img) + + # Layer random shapes + for _ in range(random.randint(15, 40)): + shape = random.choice(["circle", "rect", "line"]) + color = _random_color() + + if shape == "circle": + cx = random.randint(0, width) + cy = random.randint(0, height) + r = random.randint(10, min(width, height) // 3) + draw.ellipse([cx - r, cy - r, cx + r, cy + r], fill=color) + elif shape == "rect": + x1 = random.randint(0, width) + y1 = random.randint(0, height) + x2 = x1 + random.randint(20, width // 2) + y2 = y1 + random.randint(20, height // 2) + draw.rectangle([x1, y1, x2, y2], fill=color) + else: + points = [ + (random.randint(0, width), random.randint(0, height)) + for _ in range(random.randint(2, 5)) + ] + draw.line(points, fill=color, width=random.randint(1, 8)) + + img = img.filter(ImageFilter.GaussianBlur(radius=random.uniform(0.5, 2.0))) + return img + + +def _random_color(pastel=False): + if pastel: + return tuple(random.randint(180, 255) for _ in range(3)) + return tuple(random.randint(0, 255) for _ in range(3)) + + +class Handler(BaseHTTPRequestHandler): + def do_GET(self): + parsed = urlparse(self.path) + params = parse_qs(parsed.query) + + width = min(int(params.get("w", [512])[0]), 2048) + height = min(int(params.get("h", [512])[0]), 2048) + seed = params.get("seed", [None])[0] + if seed is not None: + seed = int(seed) + + img = generate_image(width, height, seed) + + buf = BytesIO() + img.save(buf, format="PNG") + body = buf.getvalue() + + self.send_response(200) + self.send_header("Content-Type", 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100644 index 0000000..e263b66 --- /dev/null +++ b/16-containers-do/package.json @@ -0,0 +1,13 @@ +{ + "name": "python-container-do", + "version": "0.0.0", + "private": true, + "scripts": { + "deploy": "uv run pywrangler deploy", + "dev": "uv run pywrangler dev", + "start": "uv run pywrangler dev" + }, + "devDependencies": { + "wrangler": "^4.46.0" + } +} diff --git a/16-containers-do/pyproject.toml b/16-containers-do/pyproject.toml new file mode 100644 index 0000000..dffbbab --- /dev/null +++ b/16-containers-do/pyproject.toml @@ -0,0 +1,13 @@ +[project] +name = "python-container-do" +version = "0.1.0" +description = "Python container-backed Durable Objects example" +readme = "README.md" +requires-python = ">=3.12" +dependencies = [] + +[dependency-groups] +dev = [ + "workers-py", + "workers-runtime-sdk" +] diff --git a/16-containers-do/src/entry.py b/16-containers-do/src/entry.py new file mode 100644 index 0000000..93477c9 --- /dev/null +++ b/16-containers-do/src/entry.py @@ -0,0 +1,32 @@ +import asyncio + +from workers import WorkerEntrypoint, Response, DurableObject + +MAX_RETRIES = 5 +RETRY_INTERVAL = 0.1 + + +class MyContainer(DurableObject): + """Container-backed Durable Object that proxies requests to a container.""" + + async def fetch(self, request): + if not self.ctx.container.running: + self.ctx.container.start() + + port = self.ctx.container.getTcpPort(8080) + url = request.url.replace("https:", "http:") + + for _ in range(MAX_RETRIES): + try: + return await port.fetch(url) + except Exception: # container not ready + await asyncio.sleep(RETRY_INTERVAL) + + return Response("Container failed to start", status=503) + + +class Default(WorkerEntrypoint): + async def fetch(self, request): + do_id = self.env.MY_CONTAINER.idFromName("image-gen") + stub = self.env.MY_CONTAINER.get(do_id) + return await stub.fetch(request) diff --git a/16-containers-do/wrangler.jsonc b/16-containers-do/wrangler.jsonc new file mode 100644 index 0000000..384fa34 --- /dev/null +++ b/16-containers-do/wrangler.jsonc @@ -0,0 +1,35 @@ +{ + "$schema": "node_modules/wrangler/config-schema.json", + "name": "python-container-do", + "main": "src/entry.py", + "compatibility_date": "2026-04-09", + "compatibility_flags": [ + "python_workers" + ], + "containers": [ + { + "class_name": "MyContainer", + "image": "./container/Dockerfile", + "max_instances": 5 + } + ], + "durable_objects": { + "bindings": [ + { + "name": "MY_CONTAINER", + "class_name": "MyContainer" + } + ] + }, + "migrations": [ + { + "tag": "v1", + "new_sqlite_classes": [ + "MyContainer" + ] + } + ], + "observability": { + "enabled": true + } +} diff --git a/README.md b/README.md index 4e2fa5c..1fdd68b 100644 --- a/README.md +++ b/README.md @@ -30,6 +30,7 @@ Need to deploy your Worker to Cloudflare? Python Workers are in open beta and ha - [**`13-js-api-pygments/`**](13-js-api-pygments) — shows how to use [Pygments](https://pygments.org/) to highlight code with Python Workers. - [**`14-websocket-stream-consumer/`**](14-websocket-stream-consumer) — shows how to use [WebSocket](https://developers.cloudflare.com/workers/runtime-apis/websockets/) to consume a stream of data with Python Workers. - [**`15-chatroom/`**](15-chatroom) - A real-time chatroom using WebSocket. +- [**`16-containers-do/`**](16-containers-do) — A [container-backed Durable Object](https://developers.cloudflare.com/containers/) that generates random abstract art using [Pillow](https://pillow.readthedocs.io/) inside a Docker container.