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[nominatim.git] / nominatim / server / starlette / server.py
1 # SPDX-License-Identifier: GPL-2.0-only
2 #
3 # This file is part of Nominatim. (https://nominatim.org)
4 #
5 # Copyright (C) 2023 by the Nominatim developer community.
6 # For a full list of authors see the git log.
7 """
8 Server implementation using the starlette webserver framework.
9 """
10 from typing import Any, Optional, Mapping, Callable, cast, Coroutine
11 from pathlib import Path
12 import datetime as dt
13
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
22
23 from nominatim.api import NominatimAPIAsync
24 import nominatim.api.v1 as api_impl
25 from nominatim.config import Configuration
26
27 class ParamWrapper(api_impl.ASGIAdaptor):
28     """ Adaptor class for server glue to Starlette framework.
29     """
30
31     def __init__(self, request: Request) -> None:
32         self.request = request
33
34
35     def get(self, name: str, default: Optional[str] = None) -> Optional[str]:
36         return self.request.query_params.get(name, default=default)
37
38
39     def get_header(self, name: str, default: Optional[str] = None) -> Optional[str]:
40         return self.request.headers.get(name, default)
41
42
43     def error(self, msg: str, status: int = 400) -> HTTPException:
44         return HTTPException(status, detail=msg,
45                              headers={'content-type': self.content_type})
46
47
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)
51
52
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):
59             port = None
60         if port is not None:
61             return f"{scheme}://{host}:{port}{root}"
62
63         return f"{scheme}://{host}{root}"
64
65
66     def config(self) -> Configuration:
67         return cast(Configuration, self.request.app.state.API.config)
68
69
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)))
74
75     return _callback
76
77
78 class FileLoggingMiddleware(BaseHTTPMiddleware):
79     """ Middleware to log selected requests into a file.
80     """
81
82     def __init__(self, app: Starlette, file_name: str = ''):
83         super().__init__(app)
84         self.fd = open(file_name, 'a', buffering=1, encoding='utf8') # pylint: disable=R1732
85
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)
90
91         if response.status_code != 200:
92             return response
93
94         finish = dt.datetime.now(tz=dt.timezone.utc)
95
96         for endpoint in ('reverse', 'search', 'lookup'):
97             if request.url.path.startswith('/' + endpoint):
98                 qtype = endpoint
99                 break
100         else:
101             return response
102
103         duration = (finish - start).total_seconds()
104         params = request.scope['query_string'].decode('utf8')
105
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')
109
110         return response
111
112
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.
117     """
118     config = Configuration(project_dir, environ)
119
120     routes = []
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))
125         if legacy_urls:
126             routes.append(Route(f"/{name}.php", endpoint=endpoint))
127
128     middleware = []
129     if config.get_bool('CORS_NOACCESSCONTROL'):
130         middleware.append(Middleware(CORSMiddleware,
131                                      allow_origins=['*'],
132                                      allow_methods=['GET', 'OPTIONS'],
133                                      max_age=86400))
134
135     log_file = config.LOG_FILE
136     if log_file:
137         middleware.append(Middleware(FileLoggingMiddleware, file_name=log_file))
138
139     async def _shutdown() -> None:
140         await app.state.API.close()
141
142     app = Starlette(debug=debug, routes=routes, middleware=middleware,
143                     on_shutdown=[_shutdown])
144
145     app.state.API = NominatimAPIAsync(project_dir, environ)
146
147     return app
148
149
150 def run_wsgi() -> Starlette:
151     """ Entry point for uvicorn.
152     """
153     return get_application(Path('.'), debug=False)