X-Git-Url: https://git.openstreetmap.org./nominatim.git/blobdiff_plain/0c65289a80fb376b9d7e53653e16cef6a8fa781e..54cb9a33b1f62b91ce7b3dd9e4773c46cc04c2b8:/nominatim/server/falcon/server.py diff --git a/nominatim/server/falcon/server.py b/nominatim/server/falcon/server.py index a536318a..5ec418a6 100644 --- a/nominatim/server/falcon/server.py +++ b/nominatim/server/falcon/server.py @@ -7,16 +7,46 @@ """ Server implementation using the falcon webserver framework. """ -from typing import Optional, Mapping, cast +from typing import Optional, Mapping, cast, Any, List from pathlib import Path +import datetime as dt -import falcon from falcon.asgi import App, Request, Response from nominatim.api import NominatimAPIAsync import nominatim.api.v1 as api_impl from nominatim.config import Configuration +class HTTPNominatimError(Exception): + """ A special exception class for errors raised during processing. + """ + def __init__(self, msg: str, status: int, content_type: str) -> None: + self.msg = msg + self.status = status + self.content_type = content_type + + +async def nominatim_error_handler(req: Request, resp: Response, #pylint: disable=unused-argument + exception: HTTPNominatimError, + _: Any) -> None: + """ Special error handler that passes message and content type as + per exception info. + """ + resp.status = exception.status + resp.text = exception.msg + resp.content_type = exception.content_type + + +async def timeout_error_handler(req: Request, resp: Response, #pylint: disable=unused-argument + exception: TimeoutError, #pylint: disable=unused-argument + _: Any) -> None: + """ Special error handler that passes message and content type as + per exception info. + """ + resp.status = 503 + resp.text = "Query took too long to process." + resp.content_type = 'text/plain; charset=utf-8' + class ParamWrapper(api_impl.ASGIAdaptor): """ Adaptor class for server glue to Falcon framework. @@ -37,21 +67,20 @@ class ParamWrapper(api_impl.ASGIAdaptor): return cast(Optional[str], self.request.get_header(name, default=default)) - def error(self, msg: str, status: int = 400) -> falcon.HTTPError: - if status == 400: - return falcon.HTTPBadRequest(description=msg) - if status == 404: - return falcon.HTTPNotFound(description=msg) - - return falcon.HTTPError(status, description=msg) + def error(self, msg: str, status: int = 400) -> HTTPNominatimError: + return HTTPNominatimError(msg, status, self.content_type) - def create_response(self, status: int, output: str, content_type: str) -> None: + def create_response(self, status: int, output: str, num_results: int) -> None: + self.response.context.num_results = num_results self.response.status = status self.response.text = output - self.response.content_type = content_type + self.response.content_type = self.content_type + def base_uri(self) -> str: + return cast (str, self.request.forwarded_prefix) + def config(self) -> Configuration: return self._config @@ -60,7 +89,8 @@ class EndpointWrapper: """ Converter for server glue endpoint functions to Falcon request handlers. """ - def __init__(self, func: api_impl.EndpointFunc, api: NominatimAPIAsync) -> None: + def __init__(self, name: str, func: api_impl.EndpointFunc, api: NominatimAPIAsync) -> None: + self.name = name self.func = func self.api = api @@ -71,19 +101,83 @@ class EndpointWrapper: await self.func(self.api, ParamWrapper(req, resp, self.api.config)) +class FileLoggingMiddleware: + """ Middleware to log selected requests into a file. + """ + + def __init__(self, file_name: str): + self.fd = open(file_name, 'a', buffering=1, encoding='utf8') # pylint: disable=R1732 + + + async def process_request(self, req: Request, _: Response) -> None: + """ Callback before the request starts timing. + """ + req.context.start = dt.datetime.now(tz=dt.timezone.utc) + + + async def process_response(self, req: Request, resp: Response, + resource: Optional[EndpointWrapper], + req_succeeded: bool) -> None: + """ Callback after requests writes to the logfile. It only + writes logs for sucessful requests for search, reverse and lookup. + """ + if not req_succeeded or resource is None or resp.status != 200\ + or resource.name not in ('reverse', 'search', 'lookup', 'details'): + return + + finish = dt.datetime.now(tz=dt.timezone.utc) + duration = (finish - req.context.start).total_seconds() + params = req.scope['query_string'].decode('utf8') + start = req.context.start.replace(tzinfo=None)\ + .isoformat(sep=' ', timespec='milliseconds') + + self.fd.write(f"[{start}] " + f"{duration:.4f} {getattr(resp.context, 'num_results', 0)} " + f'{resource.name} "{params}"\n') + + +class APIShutdown: + """ Middleware that closes any open database connections. + """ + + def __init__(self, api: NominatimAPIAsync) -> None: + self.api = api + + async def process_shutdown(self, *_: Any) -> None: + """Process the ASGI lifespan shutdown event. + """ + await self.api.close() + + def get_application(project_dir: Path, environ: Optional[Mapping[str, str]] = None) -> App: """ Create a Nominatim Falcon ASGI application. """ api = NominatimAPIAsync(project_dir, environ) - app = App(cors_enable=api.config.get_bool('CORS_NOACCESSCONTROL')) + middleware: List[object] = [APIShutdown(api)] + log_file = api.config.LOG_FILE + if log_file: + middleware.append(FileLoggingMiddleware(log_file)) + + app = App(cors_enable=api.config.get_bool('CORS_NOACCESSCONTROL'), + middleware=middleware) + app.add_error_handler(HTTPNominatimError, nominatim_error_handler) + app.add_error_handler(TimeoutError, timeout_error_handler) legacy_urls = api.config.get_bool('SERVE_LEGACY_URLS') for name, func in api_impl.ROUTES: - endpoint = EndpointWrapper(func, api) + endpoint = EndpointWrapper(name, func, api) app.add_route(f"/{name}", endpoint) if legacy_urls: app.add_route(f"/{name}.php", endpoint) return app + + +def run_wsgi() -> App: + """ Entry point for uvicorn. + + Make sure uvicorn is run from the project directory. + """ + return get_application(Path('.'))