1 # SPDX-License-Identifier: GPL-2.0-only
3 # This file is part of Nominatim. (https://nominatim.org)
5 # Copyright (C) 2023 by the Nominatim developer community.
6 # For a full list of authors see the git log.
8 Server implementation using the starlette webserver framework.
10 from typing import Any, Optional, Mapping, Callable, cast, Coroutine
11 from pathlib import Path
14 from starlette.applications import Starlette
15 from starlette.routing import Route
16 from starlette.exceptions import HTTPException
17 from starlette.responses import Response
18 from starlette.requests import Request
19 from starlette.middleware import Middleware
20 from starlette.middleware.base import BaseHTTPMiddleware, RequestResponseEndpoint
21 from starlette.middleware.cors import CORSMiddleware
23 from nominatim.api import NominatimAPIAsync
24 import nominatim.api.v1 as api_impl
25 from nominatim.config import Configuration
27 class ParamWrapper(api_impl.ASGIAdaptor):
28 """ Adaptor class for server glue to Starlette framework.
31 def __init__(self, request: Request) -> None:
32 self.request = request
35 def get(self, name: str, default: Optional[str] = None) -> Optional[str]:
36 return self.request.query_params.get(name, default=default)
39 def get_header(self, name: str, default: Optional[str] = None) -> Optional[str]:
40 return self.request.headers.get(name, default)
43 def error(self, msg: str, status: int = 400) -> HTTPException:
44 return HTTPException(status, detail=msg,
45 headers={'content-type': self.content_type})
48 def create_response(self, status: int, output: str, num_results: int) -> Response:
49 self.request.state.num_results = num_results
50 return Response(output, status_code=status, media_type=self.content_type)
53 def base_uri(self) -> str:
54 scheme = self.request.url.scheme
55 host = self.request.url.hostname
56 port = self.request.url.port
57 root = self.request.scope['root_path']
58 if (scheme == 'http' and port == 80) or (scheme == 'https' and port == 443):
61 return f"{scheme}://{host}:{port}{root}"
63 return f"{scheme}://{host}{root}"
66 def config(self) -> Configuration:
67 return cast(Configuration, self.request.app.state.API.config)
70 def _wrap_endpoint(func: api_impl.EndpointFunc)\
71 -> Callable[[Request], Coroutine[Any, Any, Response]]:
72 async def _callback(request: Request) -> Response:
73 return cast(Response, await func(request.app.state.API, ParamWrapper(request)))
78 class FileLoggingMiddleware(BaseHTTPMiddleware):
79 """ Middleware to log selected requests into a file.
82 def __init__(self, app: Starlette, file_name: str = ''):
84 self.fd = open(file_name, 'a', buffering=1, encoding='utf8') # pylint: disable=R1732
86 async def dispatch(self, request: Request,
87 call_next: RequestResponseEndpoint) -> Response:
88 start = dt.datetime.now(tz=dt.timezone.utc)
89 response = await call_next(request)
91 if response.status_code != 200:
94 finish = dt.datetime.now(tz=dt.timezone.utc)
96 for endpoint in ('reverse', 'search', 'lookup'):
97 if request.url.path.startswith('/' + endpoint):
103 duration = (finish - start).total_seconds()
104 params = request.scope['query_string'].decode('utf8')
106 self.fd.write(f"[{start.replace(tzinfo=None).isoformat(sep=' ', timespec='milliseconds')}] "
107 f"{duration:.4f} {getattr(request.state, 'num_results', 0)} "
108 f'{qtype} "{params}"\n')
113 def get_application(project_dir: Path,
114 environ: Optional[Mapping[str, str]] = None,
115 debug: bool = True) -> Starlette:
116 """ Create a Nominatim falcon ASGI application.
118 config = Configuration(project_dir, environ)
121 legacy_urls = config.get_bool('SERVE_LEGACY_URLS')
122 for name, func in api_impl.ROUTES:
123 endpoint = _wrap_endpoint(func)
124 routes.append(Route(f"/{name}", endpoint=endpoint))
126 routes.append(Route(f"/{name}.php", endpoint=endpoint))
129 if config.get_bool('CORS_NOACCESSCONTROL'):
130 middleware.append(Middleware(CORSMiddleware,
132 allow_methods=['GET', 'OPTIONS'],
135 log_file = config.LOG_FILE
137 middleware.append(Middleware(FileLoggingMiddleware, file_name=log_file))
139 async def _shutdown() -> None:
140 await app.state.API.close()
142 app = Starlette(debug=debug, routes=routes, middleware=middleware,
143 on_shutdown=[_shutdown])
145 app.state.API = NominatimAPIAsync(project_dir, environ)
150 def run_wsgi() -> Starlette:
151 """ Entry point for uvicorn.
153 return get_application(Path('.'), debug=False)