Create basic database schema, and creation script

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

README.md

@@ -0,0 +1,3 @@
+## Setup
+
+Create the database schema `docker-compose exec webserver python src/makedb.py`

webserver/src/database.py

@@ -4,12 +4,16 @@ Database handling code for the CodePage
 import psycopg2
 import config
 
-def getdb():
-    return psycopg2.connect(
-            dbname=config.DB_NAME,
-            user=config.DB_USER,
-            password=config.DB_PASS,
-            host=config.DB_HOST,
-            port=config.DB_PORT
-            )
+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)
+    );
+    """)
+