remove support for sanic framework

There is no performance gain over falcon or starlette but the special
structure of sanic makes it hard to have exchangable code

nominatim/server/sanic/server.py

@@ -1,78 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-#
-# This file is part of Nominatim. (https://nominatim.org)
-#
-# Copyright (C) 2023 by the Nominatim developer community.
-# For a full list of authors see the git log.
-"""
-Server implementation using the sanic webserver framework.
-"""
-from typing import Any, Optional, Mapping, Callable, cast, Coroutine
-from pathlib import Path
-
-from sanic import Request, HTTPResponse, Sanic
-from sanic.exceptions import SanicException
-from sanic.response import text as TextResponse
-
-from nominatim.api import NominatimAPIAsync
-import nominatim.api.v1 as api_impl
-from nominatim.config import Configuration
-
-class ParamWrapper(api_impl.ASGIAdaptor):
-    """ Adaptor class for server glue to Sanic framework.
-    """
-
-    def __init__(self, request: Request) -> None:
-        self.request = request
-
-
-    def get(self, name: str, default: Optional[str] = None) -> Optional[str]:
-        return cast(Optional[str], self.request.args.get(name, default))
-
-
-    def get_header(self, name: str, default: Optional[str] = None) -> Optional[str]:
-        return cast(Optional[str], self.request.headers.get(name, default))
-
-
-    def error(self, msg: str, status: int = 400) -> SanicException:
-        exception = SanicException(msg, status_code=status)
-
-        return exception
-
-
-    def create_response(self, status: int, output: str) -> HTTPResponse:
-        return TextResponse(output, status=status, content_type=self.content_type)
-
-
-    def config(self) -> Configuration:
-        return cast(Configuration, self.request.app.ctx.api.config)
-
-
-def _wrap_endpoint(func: api_impl.EndpointFunc)\
-       -> Callable[[Request], Coroutine[Any, Any, HTTPResponse]]:
-    async def _callback(request: Request) -> HTTPResponse:
-        return cast(HTTPResponse, await func(request.app.ctx.api, ParamWrapper(request)))
-
-    return _callback
-
-
-def get_application(project_dir: Path,
-                    environ: Optional[Mapping[str, str]] = None) -> Sanic:
-    """ Create a Nominatim sanic ASGI application.
-    """
-    app = Sanic("NominatimInstance")
-
-    app.ctx.api = NominatimAPIAsync(project_dir, environ)
-
-    if app.ctx.api.config.get_bool('CORS_NOACCESSCONTROL'):
-        from sanic_cors import CORS # pylint: disable=import-outside-toplevel
-        CORS(app)
-
-    legacy_urls = app.ctx.api.config.get_bool('SERVE_LEGACY_URLS')
-    for name, func in api_impl.ROUTES:
-        endpoint = _wrap_endpoint(func)
-        app.add_route(endpoint, f"/{name}", name=f"v1_{name}_simple")
-        if legacy_urls:
-            app.add_route(endpoint, f"/{name}.php", name=f"v1_{name}_legacy")
-
-    return app