initial

.gitignore

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+__pycache__/
+ENV

Dockerfile

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+FROM python:latest
+
+LABEL Maintainer="Wolfgang Hottgenroth wolfgang.hottgenroth@icloud.com"
+
+ARG APP_DIR="/opt/app"
+ARG CONF_DIR="${APP_DIR}/config"
+
+ENV DB_HOST="172.16.10.18"
+ENV DB_NAME="hausverwaltung"
+ENV DB_USER="hausverwaltung-ui"
+ENV DB_PASS="test123"
+
+
+RUN \
+    apt update && \
+    apt install -y libmariadbclient-dev && \
+    pip3 install mariadb && \
+    pip3 install connexion && \
+    pip3 install connexion[swagger-ui] && \
+    pip3 install uwsgi && \
+    pip3 install flask-cors
+
+RUN \
+    mkdir -p ${APP_DIR} && \
+    mkdir -p ${CONF_DIR} && \
+    useradd -d ${APP_DIR} -u 1000 user
+
+COPY *.py ${APP_DIR}/
+COPY swagger.yaml ${APP_DIR}/
+COPY server.ini ${CONF_DIR}/
+
+USER 1000:1000
+WORKDIR ${APP_DIR}
+VOLUME ${CONF_DIR}
+
+EXPOSE 5000
+EXPOSE 9191
+
+CMD [ "uwsgi", "./config/server.ini" ]
+
+
+

Objekte.py

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+from dbpool import getConnection
+
+def get_objekte():
+    try:
+        dbh = getConnection()
+        objekte = []
+        cur = dbh.cursor()
+        cur.execute("SELECT id, shortname, flaeche FROM objekt")
+        for (id, shortname, flaeche) in cur:
+            objekte.append({
+                "id": id, 
+                "shortname": shortname,
+                "flaeche": flaeche
+            })
+        return objekte
+    except Exception as err:
+        return str(err), 500
+    finally:
+        dbh.close()
+
+
+def get_objekt(id=None):
+    try:
+        dbh = getConnection()
+        cur = dbh.cursor()
+        cur.execute("SELECT id, shortname, flaeche FROM objekt WHERE id = ?", (id,))
+        objekt = None
+        try:
+            (id, shortname, flaeche) = cur.next()
+            objekt = { 
+                "id": id, 
+                "shortname": shortname,
+                "flaeche": flaeche
+            }
+        except StopIteration:
+            return "Objekt not found", 404
+        try:
+            (id, shortname, flaeche) = cur.next()
+            return "More than one Objekt by that id ({}, {}, {})".format(id, shortname, flaeche), 500
+        except:
+            pass
+        return objekt        
+    except Exception as err:
+        return str(err), 500
+    finally:
+        dbh.close()

Wohnungen.py

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+from dbpool import getConnection
+
+def get_wohnungen():
+    try:
+        dbh = getConnection()
+        wohnungen = []
+        cur = dbh.cursor()
+        cur.execute("""
+SELECT w.id as id, 
+       w.objekt as objekt_id, 
+       w.shortname as wohnung, 
+       w.flaeche as flaeche, 
+       o.shortname as objekt
+  FROM wohnung w, objekt o
+  WHERE o.id = w.objekt
+""")
+        for (id, objekt_id, wohnung, flaeche, objekt) in cur:
+            wohnungen.append({
+                "id": id, 
+                "objekt_id": objekt_id,
+                "wohnung": wohnung,
+                "flaeche": flaeche,
+                "objekt": objekt
+            })
+        return wohnungen
+    except Exception as err:
+        return str(err), 500
+    finally:
+        dbh.close()
+
+
+def get_wohnung(id=None):
+    try:
+        dbh = getConnection()
+        cur = dbh.cursor()
+        cur.execute("""
+SELECT w.id as id, 
+       w.objekt as objekt_id, 
+       w.shortname as wohnung, 
+       w.flaeche as flaeche, 
+       o.shortname as objekt
+  FROM wohnung w, objekt o
+  WHERE o.id = w.objekt AND
+        w.id = ?
+""", (id, ))
+        wohnung = None
+        try:
+            (id, objekt_id, wohnung_name, flaeche, objekt_name) = cur.next()
+            wohnung = {
+                "id": id, 
+                "objekt_id": objekt_id,
+                "wohnung": wohnung_name,
+                "flaeche": flaeche,
+                "objekt": objekt_name
+            }
+        except StopIteration:
+            return "Wohnung not found", 404
+        try:
+            (id, objekt_id, wohnung_name, flaeche, objekt_name) = cur.next()
+            return "More than one Wohnung by that id ({}, {}, {}, {})".format(id, objekt_name, wohnung_name, flaeche), 500
+        except:
+            pass
+        return wohnung        
+    except Exception as err:
+        return str(err), 500
+    finally:
+        dbh.close()

dbpool.py

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+import mariadb
+import os
+
+pool = None
+
+def createConnectionPool():
+    global pool
+
+    try:
+        user = os.environ["DB_USER"]
+        password = os.environ["DB_PASS"]
+        host = os.environ["DB_HOST"]
+        database = os.environ["DB_NAME"]
+    except KeyError as err:
+        raise Exception("Database configuration variable {} not available".format(err))
+
+    pool = mariadb.ConnectionPool(
+        user = user,
+        password = password,
+        host = host,
+        database = database,
+        pool_name = 'hv-wep-app',
+        pool_size = 5
+    )
+
+def getConnection():
+    global pool
+    return pool.get_connection()

server.ini

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+[uwsgi]
+http = :5000
+wsgi-file = server.py
+processes = 4
+threads = 2
+stats = :9191
+

server.py

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+import connexion
+from flask_cors import CORS
+from dbpool import createConnectionPool
+
+# prepare database connections
+createConnectionPool()
+
+# instantiate the webservice
+app = connexion.App(__name__)
+app.add_api('swagger.yaml')
+
+# CORSify it - otherwise Angular won't accept it
+CORS(app.app)
+
+# provide the webservice application to uwsgi
+application = app.app

swagger.yaml

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+swagger: '2.0'
+info:
+  title: Hausverwaltung
+  version: "0.1"
+
+paths:
+  /hv/objekte:
+    get:
+      tags: [ "Objekte" ]
+      operationId: Objekte.get_objekte
+      summary: Returns all Objekte
+      responses:
+        200:
+          description: Successful response.
+          schema:
+            type: array
+            items:
+              $ref: '#/definitions/Objekt'
+        404:
+          description: No Objekte available
+        500:
+          description: Some server error
+  /hv/objekt/{id}:
+    get:
+      tags: [ "Objekte" ]
+      operationId: Objekte.get_objekt
+      summary: Returns Objekt by id
+      parameters:
+        - name: id
+          in: path
+          type: integer
+          required: true
+      responses:
+        200:
+          description: Successful response.
+          schema:
+            $ref: '#/definitions/Objekt'
+        404:
+          description: Objekt not found
+        500:
+          description: Some server error
+  /hv/wohnungen:
+    get:
+      tags: [ "Wohnungen" ]
+      operationId: Wohnungen.get_wohnungen
+      summary: Returns all Wohnungen
+      responses:
+        200:
+          description: Successful response.
+          schema:
+            type: array
+            items:
+              $ref: '#/definitions/Wohnung'
+        404:
+          description: No Wohnung available
+        500:
+          description: Some server error
+  /hv/wohnung/{id}:
+    get:
+      tags: [ "Wohnungen" ]
+      operationId: Wohnungen.get_wohnung
+      summary: Returns Wohnung by id
+      parameters:
+        - name: id
+          in: path
+          type: integer
+          required: true
+      responses:
+        200:
+          description: Successful response.
+          schema:
+            $ref: '#/definitions/Wohnung'
+        404:
+          description: Wohnung not found
+        500:
+          description: Some server error
+
+definitions:
+  Objekt:
+    description: Objekt type
+    type: object
+    properties:
+      id: 
+        type: integer
+      shortname: 
+        type: string
+      flaeche:
+        type: number
+  Wohnung:
+    description: Wohnung type
+    type: object
+    properties:
+      id: 
+        type: integer
+      objekt_id: 
+        type: integer
+      wohnung: 
+        type: string
+      flaeche:
+        type: number
+      objekt:
+        type: string