Add HW 5

homework/05-message-queue/solution/server/Dockerfile

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+# syntax=docker/dockerfile:1
+FROM python:3.12-slim
+
+RUN apt-get update && apt-get install -y curl \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /server
+COPY requirements.txt .
+RUN --mount=type=cache,id=distsys-course-pip,target=/root/.cache/pip,sharing=locked \
+    pip install -r requirements.txt
+COPY . .
+
+CMD ["python3", "-u", "server.py"]

homework/05-message-queue/solution/server/requirements.txt

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+flask==3.1.2
+pika==1.3.2

homework/05-message-queue/solution/server/server.py

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+from flask import Flask, request
+from typing import List, Optional
+
+
+class Server:
+    # TODO: Implement API server
+    def __init__(self, mq_host, mq_port, data_dir):
+        pass
+
+    def add_image(self, image_url: str) -> str:
+        raise NotImplementedError
+
+    def get_processed_images(self) -> List[str]:
+        raise NotImplementedError
+
+    def get_image_caption(self, image_id: str) -> Optional[str]:
+        raise NotImplementedError
+
+
+def create_app() -> Flask:
+    app = Flask(__name__)
+
+    server = Server('rabbitmq', 5672, '/data')
+
+    @app.route('/api/v1.0/images', methods=['POST'])
+    def add_image():
+        body = request.get_json(force=True)
+        if not isinstance(body, dict) or not isinstance(body.get('image_url'), str) or not body['image_url']:
+            return 'image_url must be a nonempty string', 400
+        image_id = server.add_image(body['image_url'])
+        return {"image_id": image_id}
+
+    @app.route('/api/v1.0/images', methods=['GET'])
+    def get_processed_images():
+        image_ids = server.get_processed_images()
+        return {"image_ids": image_ids}
+
+    @app.route('/api/v1.0/images/<string:image_id>', methods=['GET'])
+    def get_image_caption(image_id):
+        result = server.get_image_caption(image_id)
+        if result is None:
+            return "Image not found.", 404
+        else:
+            return {'caption': result}
+
+    return app
+
+
+if __name__ == '__main__':
+    app = create_app()
+    app.run(host='0.0.0.0', port=5000)