Create basic database schema, and creation script

makedb should only have idempotent migrations, so it can be run on an
existing database.

README.md

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+## Setup
+
+Create the database schema `docker-compose exec webserver python src/makedb.py`

database/Dockerfile

@@ -1,7 +1,7 @@
 FROM postgres:11
-ENV POSTGRES_USER flittr
-ENV POSTGRES_PASSWORD flittr
-ENV POSTGRES_DB flittr
+ENV POSTGRES_USER codepage
+ENV POSTGRES_PASSWORD codepage
+ENV POSTGRES_DB codepage
 ENV PGDATA /var/lib/postgresql/data/pgdata
 VOLUME /var/lib/postgresql/data/pgdata
 

webserver/Dockerfile

@@ -1,4 +1,6 @@
 FROM python:3
 RUN pip install -U Flask
-ADD hello.py ./
-CMD ["python", "hello.py"]
+RUN pip install psycopg2
+WORKDIR /
+ADD ./src/ /src/
+CMD ["python", "/src/webserver.py"]

webserver/src/config.py

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+DB_NAME = "codepage"
+DB_USER = "codepage"
+DB_PASS = "codepage"
+DB_HOST = "database"
+DB_PORT = 5432

webserver/src/database.py

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+"""
+Database handling code for the CodePage
+"""
+import psycopg2
+import config
+
+DATABASE = None
+
+def getdb():
+    global DATABASE
+    if DATABASE is None:
+        DATABASE = psycopg2.connect(
+                dbname=config.DB_NAME,
+                user=config.DB_USER,
+                password=config.DB_PASS,
+                host=config.DB_HOST,
+                port=config.DB_PORT)
+    return DATABASE.cursor()
+

webserver/src/makedb.py

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+from database import getdb
+
+with getdb() as db:
+    # Initial database schema
+    db.execute("""
+    CREATE TABLE IF NOT EXISTS users (
+        id          INT     PRIMARY KEY NOT NULL,
+        dispname    TEXT                NOT NULL,
+        pwhash      TEXT                NOT NULL
+    );
+    CREATE TABLE IF NOT EXISTS codes (
+        id          INT     PRIMARY KEY NOT NULL,
+        username    INT                 NOT NULL,
+        language    TEXT                NOT NULL,
+        title       TEXT                NOT NULL,
+        contents    TEXT                NOT NULL,
+        FOREIGN KEY (username) REFERENCES users(id)
+    );
+    """)
+

webserver/src/webserver.py

@@ -1,9 +1,11 @@
 from flask import Flask
+from database import getdb
 
 app = Flask(__name__)
 
 @app.route("/")
 def hello():
+    with getdb() as db:
         return "Hello, world"
 
 if __name__ == '__main__':