Init

.drone.yml

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+kind: pipeline
+name: default
+
+steps:
+- name: generate
+  image: knovus/drone-openfaas
+  settings:
+    template: python3-http
+
+- name: build
+  image: plugins/docker
+  settings:
+    username:
+      from_secret: docker_registry_user
+    password:
+      from_secret: docker_registry_pass
+    registry: registry.serguzim.me
+    repo: registry.serguzim.me/faas/${DRONE_REPO_NAME}
+    context: ./build/${DRONE_REPO_NAME}/
+    dockerfile: ./build/${DRONE_REPO_NAME}/Dockerfile
+    tags: latest
+
+- name: deploy
+  image: knovus/drone-openfaas
+  settings:
+    deploy: true
+    url: https://faas.serguzim.me
+    password:
+      from_secret: openfaas_password
+    registry: registry.serguzim.me

.gitignore

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+build/
+template/

src/handler.py

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+from bs4 import BeautifulSoup
+import numpy as np
+import requests
+
+def handle(event, context):
+
+    page = requests.get('https://courses.wiso.uni-tuebingen.de/matrix/matrix-of-the-day')
+
+    soup = BeautifulSoup(page.text, 'html.parser')
+
+    matrix_tag = soup.find_all('div', class_='matrix')[0].contents
+    matrix_msg = matrix_tag[1].contents[0]
+    matrix_split = matrix_tag[2].split('\n')
+
+    while '' in matrix_split:
+        matrix_split.remove('')
+
+    for i in range(len(matrix_split)):
+        char = matrix_split[i]
+        if char == '&':
+            matrix_split[i] = ' '
+        if char == '\\\\':
+            matrix_split[i] = ';'
+
+    a = np.matrix(''.join(matrix_split[1:-1]).rstrip(';'))
+
+    result = {}
+
+    result['message'] = matrix_msg
+    result['matrix'] = str(a)
+    result['determinant'] = np.linalg.det(a)
+
+    return {
+        "statusCode": 200,
+        "body": result,
+        "headers": {
+            "content-type": "application/json",
+        },
+    }

src/requirements.txt

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+beautifulsoup4==4.9.3
+numpy==1.20.1
+requests==2.25.1

stack.yml

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+provider:
+  name: openfaas
+  gateway: https://faas.serguzim.me
+
+functions:
+  determinant-of-the-day:
+    lang: python3-http
+    handler: ./src
+    image: registry.serguzim.me/faas/determinant-of-the-day