Add PostgreSQL analytics dashboard prototype and realistic sample data

mockups/server_pg.py

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+"""Local static asset and read-only PostgreSQL API server."""
+from datetime import date, datetime
+from decimal import Decimal
+from http.server import SimpleHTTPRequestHandler, ThreadingHTTPServer
+import json
+import logging
+import os
+from pathlib import Path
+from urllib.parse import parse_qs, unquote, urlparse
+import psycopg
+from database import connect
+from sample_api import ApiError, dispatch
+
+STATIC_ROOT=Path(__file__).resolve().parent
+
+
+def encode(value):
+    if isinstance(value,(date,datetime)): return value.isoformat()
+    if isinstance(value,Decimal): return float(value)
+    raise TypeError(f'Unsupported JSON type: {type(value).__name__}')
+
+
+class Handler(SimpleHTTPRequestHandler):
+    def __init__(self,*args,**kwargs):
+        super().__init__(*args,directory=str(STATIC_ROOT),**kwargs)
+
+    def end_headers(self):
+        self.send_header('Cache-Control','no-store')
+        super().end_headers()
+
+    def send_json(self,data,status=200):
+        body=json.dumps(data,default=encode,allow_nan=False).encode('utf-8')
+        self.send_response(status)
+        self.send_header('Content-Type','application/json; charset=utf-8')
+        self.send_header('Content-Length',str(len(body)))
+        self.end_headers()
+        self.wfile.write(body)
+
+    def do_GET(self):
+        parsed=urlparse(self.path)
+        if parsed.path.startswith('/api/'):
+            try: return self.send_json(dispatch(parsed.path,parse_qs(parsed.query)))
+            except ApiError as error: return self.send_json({'error':error.message},error.status)
+            except (psycopg.Error,RuntimeError):
+                logging.exception('Database request failed')
+                return self.send_json({'error':'Sample database unavailable. Start PostgreSQL and run setup-database.ps1.'},503)
+        if parsed.path=='/':
+            self.send_response(302); self.send_header('Location','/mockups/overview-mockup.html'); self.end_headers(); return
+        name=unquote(parsed.path.removeprefix('/mockups/'))
+        if not parsed.path.startswith('/mockups/') or '/' in name or '\\' in name or Path(name).suffix not in ('.html','.css','.js'):
+            return self.send_error(404)
+        self.path='/'+name
+        return super().do_GET()
+
+
+def main():
+    with connect() as conn: conn.execute('SELECT 1 FROM games LIMIT 1')
+    port=int(os.environ.get('MOCKUP_PORT','8011'))
+    server=ThreadingHTTPServer(('127.0.0.1',port),Handler)
+    print(f'PostgreSQL mockups: http://127.0.0.1:{port}/mockups/overview-mockup.html',flush=True)
+    try: server.serve_forever()
+    except KeyboardInterrupt: server.server_close()