Permalink
Branch: master
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
183 lines (144 sloc) 5.3 KB
# -*- coding: utf-8 -*-
"""
twisted-server.py
~~~~~~~~~~~~~~~~~
A fully-functional HTTP/2 server written for Twisted.
"""
import functools
import mimetypes
import os
import os.path
import sys
from OpenSSL import crypto
from twisted.internet.defer import Deferred, inlineCallbacks
from twisted.internet.protocol import Protocol, Factory
from twisted.internet import endpoints, reactor, ssl
from h2.config import H2Configuration
from h2.connection import H2Connection
from h2.events import (
RequestReceived, DataReceived, WindowUpdated
)
def close_file(file, d):
file.close()
READ_CHUNK_SIZE = 8192
class H2Protocol(Protocol):
def __init__(self, root):
config = H2Configuration(client_side=False)
self.conn = H2Connection(config=config)
self.known_proto = None
self.root = root
self._flow_control_deferreds = {}
def connectionMade(self):
self.conn.initiate_connection()
self.transport.write(self.conn.data_to_send())
def dataReceived(self, data):
if not self.known_proto:
self.known_proto = True
events = self.conn.receive_data(data)
if self.conn.data_to_send:
self.transport.write(self.conn.data_to_send())
for event in events:
if isinstance(event, RequestReceived):
self.requestReceived(event.headers, event.stream_id)
elif isinstance(event, DataReceived):
self.dataFrameReceived(event.stream_id)
elif isinstance(event, WindowUpdated):
self.windowUpdated(event)
def requestReceived(self, headers, stream_id):
headers = dict(headers) # Invalid conversion, fix later.
assert headers[b':method'] == b'GET'
path = headers[b':path'].lstrip(b'/')
full_path = os.path.join(self.root, path)
if not os.path.exists(full_path):
response_headers = (
(':status', '404'),
('content-length', '0'),
('server', 'twisted-h2'),
)
self.conn.send_headers(
stream_id, response_headers, end_stream=True
)
self.transport.write(self.conn.data_to_send())
else:
self.sendFile(full_path, stream_id)
return
def dataFrameReceived(self, stream_id):
self.conn.reset_stream(stream_id)
self.transport.write(self.conn.data_to_send())
def sendFile(self, file_path, stream_id):
filesize = os.stat(file_path).st_size
content_type, content_encoding = mimetypes.guess_type(file_path)
response_headers = [
(':status', '200'),
('content-length', str(filesize)),
('server', 'twisted-h2'),
]
if content_type:
response_headers.append(('content-type', content_type))
if content_encoding:
response_headers.append(('content-encoding', content_encoding))
self.conn.send_headers(stream_id, response_headers)
self.transport.write(self.conn.data_to_send())
f = open(file_path, 'rb')
d = self._send_file(f, stream_id)
d.addErrback(functools.partial(close_file, f))
def windowUpdated(self, event):
"""
Handle a WindowUpdated event by firing any waiting data sending
callbacks.
"""
stream_id = event.stream_id
if stream_id and stream_id in self._flow_control_deferreds:
d = self._flow_control_deferreds.pop(stream_id)
d.callback(event.delta)
elif not stream_id:
for d in self._flow_control_deferreds.values():
d.callback(event.delta)
self._flow_control_deferreds = {}
return
@inlineCallbacks
def _send_file(self, file, stream_id):
"""
This callback sends more data for a given file on the stream.
"""
keep_reading = True
while keep_reading:
while not self.conn.remote_flow_control_window(stream_id):
yield self.wait_for_flow_control(stream_id)
chunk_size = min(
self.conn.remote_flow_control_window(stream_id), READ_CHUNK_SIZE
)
data = file.read(chunk_size)
keep_reading = len(data) == chunk_size
self.conn.send_data(stream_id, data, not keep_reading)
self.transport.write(self.conn.data_to_send())
if not keep_reading:
break
file.close()
def wait_for_flow_control(self, stream_id):
"""
Returns a Deferred that fires when the flow control window is opened.
"""
d = Deferred()
self._flow_control_deferreds[stream_id] = d
return d
class H2Factory(Factory):
def __init__(self, root):
self.root = root
def buildProtocol(self, addr):
return H2Protocol(self.root)
root = sys.argv[1]
with open('server.crt', 'r') as f:
cert_data = f.read()
with open('server.key', 'r') as f:
key_data = f.read()
cert = crypto.load_certificate(crypto.FILETYPE_PEM, cert_data)
key = crypto.load_privatekey(crypto.FILETYPE_PEM, key_data)
options = ssl.CertificateOptions(
privateKey=key,
certificate=cert,
acceptableProtocols=[b'h2'],
)
endpoint = endpoints.SSL4ServerEndpoint(reactor, 8080, options, backlog=128)
endpoint.listen(H2Factory(root))
reactor.run()