Refactor figures; get use of Python 3.9 features.

roentgen/server.py

@@ -12,26 +12,23 @@ __email__ = "me@enzet.ru"
 
 
 class Handler(BaseHTTPRequestHandler):
-
-    update_cache: bool = False
+    """
+    HTTP request handler that process sloppy map tile requests.
+    """
 
     def __init__(self, request, client_address, server):
         super().__init__(request, client_address, server)
         self.cache: Path = Path("cache")
+        self.update_cache: bool = False
 
-    def write(self, message):
-        if isinstance(message, bytes):
-            self.wfile.write(message)
-        else:
-            self.wfile.write(message.encode("utf-8"))
-
-    def do_GET(self):
-        parts = self.path.split("/")
+    def do_GET(self) -> None:
+        """Serve a GET request."""
+        parts: list[str] = self.path.split("/")
         if not (len(parts) == 5 and not parts[0] and parts[1] == "tiles"):
             return
-        zoom = int(parts[2])
-        x = int(parts[3])
-        y = int(parts[4])
+        zoom: int = int(parts[2])
+        x: int = int(parts[3])
+        y: int = int(parts[4])
         tile_path: Path = workspace.get_tile_path()
         png_path = tile_path / f"tile_{zoom}_{x}_{y}.png"
         if self.update_cache:
@@ -48,7 +45,7 @@ class Handler(BaseHTTPRequestHandler):
                 self.send_response(200)
                 self.send_header("Content-type", "image/png")
                 self.end_headers()
-                self.write(input_file.read())
+                self.wfile.write(input_file.read())
                 return
 
 
@@ -56,7 +53,7 @@ def ui(options):
     server: Optional[HTTPServer] = None
     try:
         port: int = 8080
-        server = HTTPServer(("", port), Handler)
+        server: HTTPServer = HTTPServer(("", port), Handler)
         server.cache_path = Path(options.cache)
         server.serve_forever()
         logging.info(f"Server started on port {port}.")