QMAAS (quick math as a service) strikes again

docker-compose.yml

version: '2.0'

services:

  fib:
    build: .
    ports:
      - "8000:8000"
    depends_on:
      - redis

  redis:
    image: "redis:alpine"
    ports:
      - "6379:6379"

Dockerfile

FROM snakepacker/python:all as builder
RUN python3.8 -m venv /usr/share/python3/app
RUN /usr/share/python3/app/bin/pip install -U pip redis falcon gunicorn requests
RUN find-libdeps /usr/share/python3/app > /usr/share/python3/app/pkgdeps.txt

FROM snakepacker/python:3.8
COPY --from=builder /usr/share/python3/app /usr/share/python3/app
RUN cat /usr/share/python3/app/pkgdeps.txt | xargs apt-install
RUN ln -snf /usr/share/python3/app/bin/gunicorn /usr/bin/
RUN mkdir /app && echo 'import redis; import falcon; import requests as rq \n\
redis = redis.Redis(host="redis", port=6379, db=0)\n\
redis.flushall()\n\
redis.set(1, 0)\n\
redis.set(2, 1)\n\
api = falcon.API()\n\
\n\
class CachedFib:\n\
  def fib(self, n):\n\
    if fib_of_n := redis.get(n):\n\
      return int(fib_of_n)\n\
    else:\n\
      fib_of_n = int(self.fib(n - 2) + self.fib(n - 1))\n\
      redis.set(n, fib_of_n)\n\
      return fib_of_n\n\
\n\
  def on_get(self, req, res, n):\n\
    try:\n\
      n = int(n)\n\
      assert n > 0, f"invalid argument {n}"\n\
      res.body = str(self.fib(n))\n\
    except Exception as e:\n\
      res.body = str(e)\n\
\n\
api.add_route("/fib/{n}", CachedFib())' > /app/fib.py

CMD sleep 5 && cd /app && gunicorn --bind=0:8000 fib:api

example.sh

docker build -t fib .
docker-compose -f docker-compose.yml up -d
sleep 10
for i in {asd,-1,1,2,3,4,5,6,7,8,9};
  do echo "fib($i) = $(curl -s http://127.0.0.1:8000/fib/$i)";
done