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https://github.com/enzet/map-machine.git
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79 lines
2.4 KiB
Python
79 lines
2.4 KiB
Python
"""
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Röntgen tile server for slippy maps.
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"""
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import argparse
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import logging
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from http.server import HTTPServer, SimpleHTTPRequestHandler
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from pathlib import Path
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from typing import Optional
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import cairosvg
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from roentgen.tile import Tile
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from roentgen.workspace import workspace
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__author__ = "Sergey Vartanov"
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__email__ = "me@enzet.ru"
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class _Handler(SimpleHTTPRequestHandler):
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"""
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HTTP request handler that process sloppy map tile requests.
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"""
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cache: Path = Path("cache")
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update_cache: bool = False
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options = None
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def __init__(
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self, request: bytes, client_address: tuple[str, int], server
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) -> None:
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super().__init__(request, client_address, server)
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def do_GET(self) -> None:
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"""Serve a GET request."""
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parts: list[str] = self.path.split("/")
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if not (len(parts) == 5 and not parts[0] and parts[1] == "tiles"):
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return
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scale: int = int(parts[2])
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x: int = int(parts[3])
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y: int = int(parts[4])
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tile_path: Path = workspace.get_tile_path()
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png_path: Path = tile_path / f"tile_{scale}_{x}_{y}.png"
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if self.update_cache:
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svg_path: Path = png_path.with_suffix(".svg")
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if not png_path.exists():
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if not svg_path.exists():
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tile = Tile(x, y, scale)
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tile.draw(tile_path, self.cache, self.options)
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with svg_path.open() as input_file:
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cairosvg.svg2png(
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file_obj=input_file, write_to=str(png_path)
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)
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logging.info(f"SVG file is rasterized to {png_path}.")
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if png_path.exists():
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with png_path.open("rb") as input_file:
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self.send_response(200)
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self.send_header("Content-type", "image/png")
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self.end_headers()
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self.wfile.write(input_file.read())
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return
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def ui(options: argparse.Namespace) -> None:
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"""Command-line interface for tile server."""
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server: Optional[HTTPServer] = None
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try:
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port: int = 8080
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handler = _Handler
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handler.cache = Path(options.cache)
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handler.options = options
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server: HTTPServer = HTTPServer(("", port), handler)
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logging.info(f"Server started on port {port}.")
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server.serve_forever()
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finally:
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if server:
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server.socket.close()
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