mirror of
https://github.com/simonw/datasette.git
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291 lines
9.7 KiB
Python
291 lines
9.7 KiB
Python
import json
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from mimetypes import guess_type
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from sanic.views import HTTPMethodView
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from sanic.request import Request as SanicRequest
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from pathlib import Path
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from html import escape
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import re
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import aiofiles
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class AsgiRouter:
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def __init__(self, routes=None):
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routes = routes or []
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self.routes = [
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# Compile any strings to regular expressions
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((re.compile(pattern) if isinstance(pattern, str) else pattern), view)
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for pattern, view in routes
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]
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async def __call__(self, scope, receive, send):
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# Because we care about "foo/bar" v.s. "foo%2Fbar" we decode raw_path ourselves
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path = scope["raw_path"].decode("ascii")
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for regex, view in self.routes:
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match = regex.match(path)
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if match is not None:
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new_scope = dict(scope, url_route={"kwargs": match.groupdict()})
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try:
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return await view(new_scope, receive, send)
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except Exception as exception:
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return await self.handle_500(scope, receive, send, exception)
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return await self.handle_404(scope, receive, send)
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async def handle_404(self, scope, receive, send):
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await send(
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{
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"type": "http.response.start",
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"status": 404,
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"headers": [[b"content-type", b"text/html"]],
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}
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)
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await send({"type": "http.response.body", "body": b"<h1>404</h1>"})
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async def handle_500(self, scope, receive, send, exception):
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await send(
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{
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"type": "http.response.start",
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"status": 404,
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"headers": [[b"content-type", b"text/html"]],
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}
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)
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html = "<h1>500</h1><pre{}></pre>".format(escape(repr(exception)))
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await send({"type": "http.response.body", "body": html.encode("utf8")})
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class AsgiLifespan:
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def __init__(self, app, on_startup=None, on_shutdown=None):
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print("Wrapping {}".format(app))
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self.app = app
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on_startup = on_startup or []
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on_shutdown = on_shutdown or []
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if not isinstance(on_startup or [], list):
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on_startup = [on_startup]
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if not isinstance(on_shutdown or [], list):
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on_shutdown = [on_shutdown]
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self.on_startup = on_startup
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self.on_shutdown = on_shutdown
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async def __call__(self, scope, receive, send):
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if scope["type"] == "lifespan":
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while True:
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message = await receive()
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if message["type"] == "lifespan.startup":
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for fn in self.on_startup:
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await fn()
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await send({"type": "lifespan.startup.complete"})
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elif message["type"] == "lifespan.shutdown":
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for fn in self.on_shutdown:
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await fn()
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await send({"type": "lifespan.shutdown.complete"})
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return
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else:
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await self.app(scope, receive, send)
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class AsgiView(HTTPMethodView):
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@classmethod
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def as_asgi(cls, *class_args, **class_kwargs):
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async def view(scope, receive, send):
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# Uses scope to create a Sanic-compatible request object,
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# then dispatches that to self.get(...) or self.options(...)
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# along with keyword arguments that were already tucked
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# into scope["url_route"]["kwargs"] by the router
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# https://channels.readthedocs.io/en/latest/topics/routing.html#urlrouter
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path = scope.get("raw_path", scope["path"].encode("utf8"))
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if scope["query_string"]:
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path = path + b"?" + scope["query_string"]
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request = SanicRequest(
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path,
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{
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"Host": dict(scope.get("headers") or [])
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.get(b"host", b"")
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.decode("utf8")
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},
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"1.1",
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scope["method"],
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None,
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)
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# TODO: Remove need for this
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class Woo:
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def get_extra_info(self, key):
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return False
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request.app = Woo()
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request.app.websocket_enabled = False
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request.transport = Woo()
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self = view.view_class(*class_args, **class_kwargs)
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response = await self.dispatch_request(
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request, **scope["url_route"]["kwargs"]
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)
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if hasattr(response, "asgi_send"):
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await response.asgi_send(send)
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else:
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headers = {}
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headers.update(response.headers)
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headers["content-type"] = response.content_type
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await send(
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{
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"type": "http.response.start",
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"status": response.status,
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"headers": [
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[key.encode("utf-8"), value.encode("utf-8")]
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for key, value in headers.items()
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],
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}
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)
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await send({"type": "http.response.body", "body": response.body})
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view.view_class = cls
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view.__doc__ = cls.__doc__
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view.__module__ = cls.__module__
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view.__name__ = cls.__name__
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return view
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class AsgiStream:
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def __init__(self, stream_fn, status=200, headers=None, content_type="text/plain"):
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self.stream_fn = stream_fn
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self.status = status
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self.headers = headers or {}
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self.content_type = content_type
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async def asgi_send(self, send):
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# Remove any existing content-type header
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headers = dict(
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[(k, v) for k, v in self.headers.items() if k.lower() != "content-type"]
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)
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headers["content-type"] = self.content_type
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await send(
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{
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"type": "http.response.start",
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"status": self.status,
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"headers": [
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[key.encode("utf-8"), value.encode("utf-8")]
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for key, value in headers.items()
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],
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}
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)
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w = AsgiWriter(send)
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await self.stream_fn(w)
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await send({"type": "http.response.body", "body": b""})
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class AsgiWriter:
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def __init__(self, send):
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self.send = send
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async def write(self, chunk):
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await self.send(
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{
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"type": "http.response.body",
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"body": chunk.encode("utf8"),
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"more_body": True,
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}
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)
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async def asgi_send_json(send, info, status=200, headers=None):
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headers = headers or {}
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await asgi_send(
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send,
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json.dumps(info),
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status=status,
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headers=headers,
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content_type="application/json; charset=utf-8",
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)
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async def asgi_send_html(send, html, status=200, headers=None):
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headers = headers or {}
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await asgi_send(
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send, html, status=status, headers=headers, content_type="text/html"
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)
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async def asgi_send_redirect(send, location, status=302):
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await asgi_send(
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send,
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"",
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status=status,
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headers={"Location": location},
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content_type="text/html",
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)
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async def asgi_send(send, content, status, headers, content_type="text/plain"):
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await asgi_start(send, status, headers, content_type)
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await send({"type": "http.response.body", "body": content.encode("utf8")})
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async def asgi_start(send, status, headers, content_type="text/plain"):
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# Remove any existing content-type header
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headers = dict([(k, v) for k, v in headers.items() if k.lower() != "content-type"])
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headers["content-type"] = content_type
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await send(
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{
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"type": "http.response.start",
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"status": status,
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"headers": [
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[key.encode("latin1"), value.encode("latin1")]
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for key, value in headers.items()
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],
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}
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)
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async def asgi_send_file(
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send, filepath, filename=None, content_type=None, chunk_size=4096
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):
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headers = {}
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if filename:
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headers["Content-Disposition"] = 'attachment; filename="{}"'.format(filename)
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first = True
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async with aiofiles.open(str(filepath), mode="rb") as fp:
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if first:
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await asgi_start(
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send,
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200,
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headers,
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content_type or guess_type(str(filepath))[0] or "text/plain",
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)
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first = False
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more_body = True
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while more_body:
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chunk = await fp.read(chunk_size)
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more_body = len(chunk) == chunk_size
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await send(
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{"type": "http.response.body", "body": chunk, "more_body": more_body}
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)
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def asgi_static(root_path, chunk_size=4096, headers=None, content_type=None):
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async def inner_static(scope, receive, send):
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path = scope["url_route"]["kwargs"]["path"]
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full_path = (Path(root_path) / path).absolute()
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# Ensure full_path is within root_path to avoid weird "../" tricks
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try:
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full_path.relative_to(root_path)
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except ValueError:
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await asgi_send_html(send, "404", 404)
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return
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first = True
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try:
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await asgi_send_file(send, full_path, chunk_size=chunk_size)
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except FileNotFoundError:
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await asgi_send_html(send, "404", 404)
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return
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return inner_static
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class AsgiFileDownload:
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def __init__(
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self, filepath, filename=None, content_type="application/octet-stream"
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):
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self.filepath = filepath
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self.filename = filename
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self.content_type = content_type
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async def asgi_send(self, send):
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return await asgi_send_file(send, self.filepath, content_type=self.content_type)
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