# nghttp2 - HTTP/2 C Library
# Copyright (c) 2013 Tatsuhiro Tsujikawa
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
cimport cnghttp2
from libc.stdlib cimport malloc, free
from libc.string cimport memcpy, memset
from libc.stdint cimport uint8_t, uint16_t, uint32_t, int32_t
DEFAULT_HEADER_TABLE_SIZE = cnghttp2.NGHTTP2_DEFAULT_HEADER_TABLE_SIZE
DEFLATE_MAX_HEADER_TABLE_SIZE = 4096
HD_ENTRY_OVERHEAD = cnghttp2.NGHTTP2_HD_ENTRY_OVERHEAD
class HDTableEntry:
def __init__(self, name, namelen, value, valuelen):
self.name = name
self.namelen = namelen
self.value = value
self.valuelen = valuelen
def space(self):
return self.namelen + self.valuelen + HD_ENTRY_OVERHEAD
cdef _get_hd_table(cnghttp2.nghttp2_hd_context *ctx):
cdef int length = ctx.hd_table.len
cdef cnghttp2.nghttp2_hd_entry *entry
res = []
for i in range(length):
entry = cnghttp2.nghttp2_hd_table_get(ctx, i)
k = _get_pybytes(entry.nv.name, entry.nv.namelen)
v = _get_pybytes(entry.nv.value, entry.nv.valuelen)
res.append(HDTableEntry(k, entry.nv.namelen,
v, entry.nv.valuelen))
return res
cdef _get_pybytes(uint8_t *b, uint16_t blen):
return b[:blen]
cdef class HDDeflater:
'''Performs header compression. The constructor takes
|hd_table_bufsize_max| parameter, which limits the usage of header
table in the given amount of bytes. This is necessary because the
header compressor and decompressor share the same amount of
header table and the decompressor decides that number. The
compressor may not want to use all header table size because of
limited memory availability. In that case, the
|hd_table_bufsize_max| can be used to cap the upper limit of table
size whatever the header table size is chosen by the decompressor.
The default value of |hd_table_bufsize_max| is 4096 bytes.
The following example shows how to compress request header sets:
import binascii, nghttp2
deflater = nghttp2.HDDeflater()
res = deflater.deflate([(b'foo', b'bar'),
(b'baz', b'buz')])
print(binascii.b2a_hex(res))
'''
cdef cnghttp2.nghttp2_hd_deflater *_deflater
def __cinit__(self, hd_table_bufsize_max = DEFLATE_MAX_HEADER_TABLE_SIZE):
rv = cnghttp2.nghttp2_hd_deflate_new(&self._deflater,
hd_table_bufsize_max)
if rv != 0:
raise Exception(_strerror(rv))
def __dealloc__(self):
cnghttp2.nghttp2_hd_deflate_del(self._deflater)
def deflate(self, headers):
'''Compresses the |headers|. The |headers| must be sequence of tuple
of name/value pair, which are sequence of bytes (not unicode
string).
This function returns the encoded header block in byte string.
An exception will be raised on error.
'''
cdef cnghttp2.nghttp2_nv *nva = <cnghttp2.nghttp2_nv*>\
malloc(sizeof(cnghttp2.nghttp2_nv)*\
len(headers))
cdef cnghttp2.nghttp2_nv *nvap = nva
for k, v in headers:
nvap[0].name = k
nvap[0].namelen = len(k)
nvap[0].value = v
nvap[0].valuelen = len(v)
nvap[0].flags = cnghttp2.NGHTTP2_NV_FLAG_NONE
nvap += 1
cdef size_t outcap = 0
cdef ssize_t rv
cdef uint8_t *out
cdef size_t outlen
outlen = cnghttp2.nghttp2_hd_deflate_bound(self._deflater,
nva, len(headers))
out = <uint8_t*>malloc(outlen)
rv = cnghttp2.nghttp2_hd_deflate_hd(self._deflater, out, outlen,
nva, len(headers))
free(nva)
if rv < 0:
free(out)
raise Exception(_strerror(rv))
cdef bytes res
try:
res = out[:rv]
finally:
free(out)
return res
def change_table_size(self, hd_table_bufsize_max):
'''Changes header table size to |hd_table_bufsize_max| byte.
An exception will be raised on error.
'''
cdef int rv
rv = cnghttp2.nghttp2_hd_deflate_change_table_size(self._deflater,
hd_table_bufsize_max)
if rv != 0:
raise Exception(_strerror(rv))
def get_hd_table(self):
'''Returns copy of current dynamic header table.'''
return _get_hd_table(&self._deflater.ctx)
cdef class HDInflater:
'''Performs header decompression.
The following example shows how to compress request header sets:
data = b'0082c5ad82bd0f000362617a0362757a'
inflater = nghttp2.HDInflater()
hdrs = inflater.inflate(data)
print(hdrs)
'''
cdef cnghttp2.nghttp2_hd_inflater *_inflater
def __cinit__(self):
rv = cnghttp2.nghttp2_hd_inflate_new(&self._inflater)
if rv != 0:
raise Exception(_strerror(rv))
def __dealloc__(self):
cnghttp2.nghttp2_hd_inflate_del(self._inflater)
def inflate(self, data):
'''Decompresses the compressed header block |data|. The |data| must be
byte string (not unicode string).
'''
cdef cnghttp2.nghttp2_nv nv
cdef int inflate_flags
cdef ssize_t rv
cdef uint8_t *buf = data
cdef size_t buflen = len(data)
res = []
while True:
inflate_flags = 0
rv = cnghttp2.nghttp2_hd_inflate_hd(self._inflater, &nv,
&inflate_flags,
buf, buflen, 1)
if rv < 0:
raise Exception(_strerror(rv))
buf += rv
buflen -= rv
if inflate_flags & cnghttp2.NGHTTP2_HD_INFLATE_EMIT:
# may throw
res.append((nv.name[:nv.namelen], nv.value[:nv.valuelen]))
if inflate_flags & cnghttp2.NGHTTP2_HD_INFLATE_FINAL:
break
cnghttp2.nghttp2_hd_inflate_end_headers(self._inflater)
return res
def change_table_size(self, hd_table_bufsize_max):
'''Changes header table size to |hd_table_bufsize_max| byte.
An exception will be raised on error.
'''
cdef int rv
rv = cnghttp2.nghttp2_hd_inflate_change_table_size(self._inflater,
hd_table_bufsize_max)
if rv != 0:
raise Exception(_strerror(rv))
def get_hd_table(self):
'''Returns copy of current dynamic header table.'''
return _get_hd_table(&self._inflater.ctx)
cdef _strerror(int liberror_code):
return cnghttp2.nghttp2_strerror(liberror_code).decode('utf-8')
def print_hd_table(hdtable):
'''Convenient function to print |hdtable| to the standard output. This
function does not work if header name/value cannot be decoded using
UTF-8 encoding.
s=N means the entry occupies N bytes in header table.
'''
idx = 0
for entry in hdtable:
idx += 1
print('[{}] (s={}) {}: {}'\
.format(idx, entry.space(),
entry.name.decode('utf-8'),
entry.value.decode('utf-8')))
try:
import socket
import io
import asyncio
import traceback
import sys
import email.utils
import datetime
import time
except ImportError:
asyncio = None
cdef _get_stream_user_data(cnghttp2.nghttp2_session *session,
int32_t stream_id):
cdef void *stream_user_data
stream_user_data = cnghttp2.nghttp2_session_get_stream_user_data\
(session, stream_id)
if stream_user_data == NULL:
return None
return <object>stream_user_data
cdef size_t _make_nva(cnghttp2.nghttp2_nv **nva_ptr, headers):
cdef cnghttp2.nghttp2_nv *nva
cdef size_t nvlen
nvlen = len(headers)
nva = <cnghttp2.nghttp2_nv*>malloc(sizeof(cnghttp2.nghttp2_nv) * nvlen)
for i, (k, v) in enumerate(headers):
nva[i].name = k
nva[i].namelen = len(k)
nva[i].value = v
nva[i].valuelen = len(v)
nva[i].flags = cnghttp2.NGHTTP2_NV_FLAG_NONE
nva_ptr[0] = nva
return nvlen
cdef int server_on_header(cnghttp2.nghttp2_session *session,
const cnghttp2.nghttp2_frame *frame,
const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen,
uint8_t flags,
void *user_data):
cdef http2 = <_HTTP2SessionCore>user_data
handler = _get_stream_user_data(session, frame.hd.stream_id)
if not handler:
return 0
key = name[:namelen]
values = value[:valuelen].split(b'\x00')
if key == b':scheme':
handler.scheme = values[0]
elif key == b':method':
handler.method = values[0]
elif key == b':authority' or key == b'host':
handler.host = values[0]
elif key == b':path':
handler.path = values[0]
if key == b'cookie':
handler.cookies.extend(values)
else:
for v in values:
handler.headers.append((key, v))
return 0
cdef int server_on_begin_request_headers(cnghttp2.nghttp2_session *session,
const cnghttp2.nghttp2_frame *frame,
void *user_data):
cdef http2 = <_HTTP2SessionCore>user_data
handler = http2._make_handler(frame.hd.stream_id)
cnghttp2.nghttp2_session_set_stream_user_data(session, frame.hd.stream_id,
<void*>handler)
return 0
cdef int server_on_begin_headers(cnghttp2.nghttp2_session *session,
const cnghttp2.nghttp2_frame *frame,
void *user_data):
if frame.hd.type == cnghttp2.NGHTTP2_HEADERS:
if frame.headers.cat == cnghttp2.NGHTTP2_HCAT_REQUEST:
return server_on_begin_request_headers(session, frame, user_data)
return 0
cdef int server_on_frame_recv(cnghttp2.nghttp2_session *session,
const cnghttp2.nghttp2_frame *frame,
void *user_data):
cdef http2 = <_HTTP2SessionCore>user_data
if frame.hd.type == cnghttp2.NGHTTP2_DATA:
if frame.hd.flags & cnghttp2.NGHTTP2_FLAG_END_STREAM:
handler = _get_stream_user_data(session, frame.hd.stream_id)
if not handler:
return 0
try:
handler.on_request_done()
except:
sys.stderr.write(traceback.format_exc())
return http2._rst_stream(frame.hd.stream_id)
elif frame.hd.type == cnghttp2.NGHTTP2_HEADERS:
if frame.headers.cat == cnghttp2.NGHTTP2_HCAT_REQUEST:
handler = _get_stream_user_data(session, frame.hd.stream_id)
if not handler:
return 0
# Check required header fields. We expect that :authority
# or host header field.
if handler.scheme is None or handler.method is None or\
handler.host is None or handler.path is None:
return http2._rst_stream(frame.hd.stream_id,
cnghttp2.NGHTTP2_PROTOCOL_ERROR)
if handler.cookies:
handler.headers.append((b'cookie',
b'; '.join(handler.cookies)))
handler.cookies = None
try:
handler.on_headers()
if frame.hd.flags & cnghttp2.NGHTTP2_FLAG_END_STREAM:
handler.on_request_done()
except:
sys.stderr.write(traceback.format_exc())
return http2._rst_stream(frame.hd.stream_id)
elif frame.hd.type == cnghttp2.NGHTTP2_SETTINGS:
if (frame.hd.flags & cnghttp2.NGHTTP2_FLAG_ACK):
http2._stop_settings_timer()
return 0
cdef int server_on_data_chunk_recv(cnghttp2.nghttp2_session *session,
uint8_t flags,
int32_t stream_id, const uint8_t *data,
size_t length, void *user_data):
cdef http2 = <_HTTP2SessionCore>user_data
handler = _get_stream_user_data(session, stream_id)
if not handler:
return 0
try:
handler.on_data(data[:length])
except:
sys.stderr.write(traceback.format_exc())
return http2._rst_stream(stream_id)
return 0
cdef int server_on_frame_send(cnghttp2.nghttp2_session *session,
const cnghttp2.nghttp2_frame *frame,
void *user_data):
cdef http2 = <_HTTP2SessionCore>user_data
if frame.hd.type == cnghttp2.NGHTTP2_PUSH_PROMISE:
# For PUSH_PROMISE, send push response immediately
handler = _get_stream_user_data\
(session, frame.push_promise.promised_stream_id)
if not handler:
return 0
http2.send_response(handler)
elif frame.hd.type == cnghttp2.NGHTTP2_SETTINGS:
if (frame.hd.flags & cnghttp2.NGHTTP2_FLAG_ACK) == 0:
return 0
http2._start_settings_timer()
cdef int server_on_frame_not_send(cnghttp2.nghttp2_session *session,
const cnghttp2.nghttp2_frame *frame,
int lib_error_code,
void *user_data):
cdef http2 = <_HTTP2SessionCore>user_data
if frame.hd.type == cnghttp2.NGHTTP2_PUSH_PROMISE:
# We have to remove handler here. Without this, it is not
# removed until session is terminated.
handler = _get_stream_user_data\
(session, frame.push_promise.promised_stream_id)
if not handler:
return 0
http2._remove_handler(handler)
cdef int server_on_stream_close(cnghttp2.nghttp2_session *session,
int32_t stream_id,
cnghttp2.nghttp2_error_code error_code,
void *user_data):
cdef http2 = <_HTTP2SessionCore>user_data
handler = _get_stream_user_data(session, stream_id)
if not handler:
return 0
try:
handler.on_close(error_code)
except:
sys.stderr.write(traceback.format_exc())
http2._remove_handler(handler)
return 0
cdef ssize_t server_data_source_read(cnghttp2.nghttp2_session *session,
int32_t stream_id,
uint8_t *buf, size_t length,
uint32_t *data_flags,
cnghttp2.nghttp2_data_source *source,
void *user_data):
cdef http2 = <_HTTP2SessionCore>user_data
handler = <object>source.ptr
try:
data = handler.response_body.read(length)
except:
sys.stderr.write(traceback.format_exc())
return cnghttp2.NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
if data:
nread = len(data)
memcpy(buf, <uint8_t*>data, nread)
return nread
data_flags[0] = cnghttp2.NGHTTP2_DATA_FLAG_EOF
return 0
cdef class _HTTP2SessionCore:
cdef cnghttp2.nghttp2_session *session
cdef transport
cdef handler_class
cdef handlers
cdef settings_timer
def __cinit__(self, transport, handler_class):
cdef cnghttp2.nghttp2_session_callbacks callbacks
cdef cnghttp2.nghttp2_settings_entry iv[2]
cdef int rv
self.session = NULL
self.transport = transport
self.handler_class = handler_class
self.handlers = set()
self.settings_timer = None
memset(&callbacks, 0, sizeof(callbacks))
callbacks.on_header_callback = server_on_header
callbacks.on_begin_headers_callback = server_on_begin_headers
callbacks.on_frame_recv_callback = server_on_frame_recv
callbacks.on_stream_close_callback = server_on_stream_close
callbacks.on_frame_send_callback = server_on_frame_send
callbacks.on_frame_not_send_callback = server_on_frame_not_send
callbacks.on_data_chunk_recv_callback = server_on_data_chunk_recv
rv = cnghttp2.nghttp2_session_server_new(&self.session, &callbacks,
<void*>self)
if rv != 0:
raise Exception('nghttp2_session_server_new failed: {}'.format\
(_strerror(rv)))
iv[0].settings_id = cnghttp2.NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS
iv[0].value = 100
iv[1].settings_id = cnghttp2.NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE
iv[1].value = cnghttp2.NGHTTP2_INITIAL_WINDOW_SIZE
rv = cnghttp2.nghttp2_submit_settings(self.session,
cnghttp2.NGHTTP2_FLAG_NONE,
iv, sizeof(iv) / sizeof(iv[0]))
if rv != 0:
raise Exception('nghttp2_submit_settings failed: {}'.format\
(_strerror(rv)))
def __dealloc__(self):
cnghttp2.nghttp2_session_del(self.session)
def data_received(self, data):
cdef ssize_t rv
rv = cnghttp2.nghttp2_session_mem_recv(self.session, data, len(data))
if rv < 0:
raise Exception('nghttp2_session_mem_recv failed: {}'.format\
(_strerror(rv)))
self.send_data()
OUTBUF_MAX = 65535
SETTINGS_TIMEOUT = 5.0
def send_data(self):
cdef ssize_t outbuflen
cdef const uint8_t *outbuf
while True:
if self.transport.get_write_buffer_size() > self.OUTBUF_MAX:
break
outbuflen = cnghttp2.nghttp2_session_mem_send(self.session, &outbuf)
if outbuflen == 0:
break
if outbuflen < 0:
raise Exception('nghttp2_session_mem_send faild: {}'.format\
(_strerror(outbuflen)))
self.transport.write(outbuf[:outbuflen])
if self.transport.get_write_buffer_size() == 0 and \
cnghttp2.nghttp2_session_want_read(self.session) == 0 and \
cnghttp2.nghttp2_session_want_write(self.session) == 0:
self.transport.close()
def _make_handler(self, stream_id):
handler = self.handler_class(self, stream_id)
self.handlers.add(handler)
return handler
def _remove_handler(self, handler):
self.handlers.remove(handler)
def send_response(self, handler):
cdef cnghttp2.nghttp2_data_provider prd
cdef cnghttp2.nghttp2_data_provider *prd_ptr
cdef cnghttp2.nghttp2_nv *nva
cdef size_t nvlen
cdef int rv
nva = NULL
nvlen = _make_nva(&nva, handler.response_headers)
if handler.response_body:
prd.source.ptr = <void*>handler
prd.read_callback = server_data_source_read
prd_ptr = &prd
else:
prd_ptr = NULL
rv = cnghttp2.nghttp2_submit_response(self.session, handler.stream_id,
nva, nvlen, prd_ptr)
free(nva)
if rv != 0:
# TODO Ignore return value
self._rst_stream(handler.stream_id)
raise Exception('nghttp2_submit_response failed: {}'.format\
(_strerror(rv)))
self._log_request(handler)
def push(self, handler, promised_handler):
cdef cnghttp2.nghttp2_nv *nva
cdef size_t nvlen
cdef int32_t promised_stream_id
self.handlers.add(promised_handler)
nva = NULL
nvlen = _make_nva(&nva, promised_handler.headers)
promised_stream_id = cnghttp2.nghttp2_submit_push_promise\
(self.session,
cnghttp2.NGHTTP2_FLAG_NONE,
handler.stream_id,
nva, nvlen,
<void*>promised_handler)
if promised_stream_id < 0:
raise Exception('nghttp2_submit_push_promise failed: {}'.format\
(_strerror(promised_stream_id)))
promised_handler.stream_id = promised_stream_id
return promised_handler
def _rst_stream(self, stream_id,
error_code=cnghttp2.NGHTTP2_INTERNAL_ERROR):
cdef int rv
rv = cnghttp2.nghttp2_submit_rst_stream\
(self.session, cnghttp2.NGHTTP2_FLAG_NONE,
stream_id, error_code)
return rv
def _start_settings_timer(self):
loop = asyncio.get_event_loop()
self.settings_timer = loop.call_later(self.SETTINGS_TIMEOUT,
self._settings_timeout)
def _stop_settings_timer(self):
if self.settings_timer:
self.settings_timer.cancel()
self.settings_timer = None
def _settings_timeout(self):
cdef int rv
self.settings_timer = None
rv = cnghttp2.nghttp2_session_terminate_session\
(self.session, cnghttp2.NGHTTP2_SETTINGS_TIMEOUT)
try:
self.send_data()
except Exception as err:
sys.stderr.write(traceback.format_exc())
self.transport.close()
return
def _get_client_address(self):
return self.transport.get_extra_info('peername')
def _log_request(self, handler):
now = datetime.datetime.now()
tv = time.mktime(now.timetuple())
datestr = email.utils.formatdate(timeval=tv, localtime=False,
usegmt=True)
try:
method = handler.method.decode('utf-8')
except:
method = handler.method
try:
path = handler.path.decode('utf-8')
except:
path = handler.path
sys.stderr.write('{} - - [{}] "{} {} HTTP/2" {} - {}\n'.format\
(handler.client_address[0],
datestr, method, path, handler.status,
'P' if handler.pushed else '-'))
if asyncio:
class BaseRequestHandler:
"""HTTP/2 request (stream) handler base class.
The class is used to handle the HTTP/2 stream. By default, it does
not nothing. It must be subclassed to handle each event callback
method.
The first callback method invoked is on_headers(). It is called
when HEADERS frame, which includes request header fields, is
arrived.
If request has request body, on_data(data) is invoked for each
chunk of received data.
When whole request is received, on_request_done() is invoked.
When stream is closed, on_close(error_code) is called.
The application can send response using send_response() method. It
can be used in on_headers(), on_data() or on_request_done().
The application can push resource using push() method. It must be
used before send_response() call.
The following instance variables are available:
client_address
Contains a tuple of the form (host, port) referring to the client's
address.
stream_id
Stream ID of this stream
scheme
Scheme of the request URI. This is a value of :scheme header field.
method
Method of this stream. This is a value of :method header field.
host
This is a value of :authority or host header field.
path
This is a value of :path header field.
"""
def __init__(self, http2, stream_id):
self.headers = []
self.cookies = []
# Stream ID. For promised stream, it is initially -1.
self.stream_id = stream_id
self.http2 = http2
# address of the client
self.client_address = self.http2._get_client_address()
# :scheme header field in request
self.scheme = None
# :method header field in request
self.method = None
# :authority or host header field in request
self.host = None
# :path header field in request
self.path = None
# HTTP status
self.status = None
# True if this is a handler for pushed resource
self.pushed = False
def on_headers(self):
'''Called when request HEADERS is arrived.
'''
pass
def on_data(self, data):
'''Called when a chunk of request body is arrived. This method
will be called multiple times until all data are received.
'''
pass
def on_request_done(self):
'''Called when whole request was received
'''
pass
def on_close(self, error_code):
'''Called when stream is about to close.
'''
pass
def send_response(self, status=200, headers=None, body=None):
'''Send response. The status is HTTP status code. The headers is
additional response headers. The :status header field is
appended by the library. The body is the response body. It
could be None if response body is empty. Or it must be
instance of either str, bytes or io.IOBase. If instance of str
is specified, it is encoded using UTF-8.
The headers is a list of tuple of the form (name,
value). The name and value can be either unicode string or
byte string.
On error, exception will be thrown.
'''
if self.status is not None:
raise Exception('response has already been sent')
if not status:
raise Exception('status must not be empty')
body = self._wrap_body(body)
self._set_response_prop(status, headers, body)
self.http2.send_response(self)
def push(self, path, method='GET', request_headers=None,
status=200, headers=None, body=None):
'''Push a resource. The path is a path portion of request URI
for this
resource. The method is a method to access this
resource. The request_headers is additional request
headers to access this resource. The :scheme, :method,
:authority and :path are appended by the library. The
:scheme and :authority are inherited from the request (not
request_headers parameter).
The status is HTTP status code. The headers is additional
response headers. The :status header field is appended by the
library. The body is the response body. It could be None if
response body is empty. Or it must be instance of either str,
bytes or io.IOBase. If instance of str is specified, it is
encoded using UTF-8.
The headers and request_headers are a list of tuple of the
form (name, value). The name and value can be either
unicode string or byte string.
On error, exception will be thrown.
'''
if not status:
raise Exception('status must not be empty')
if not method:
raise Exception('method must not be empty')
if not path:
raise Exception('path must not be empty')
body = self._wrap_body(body)
promised_handler = self.http2._make_handler(-1)
promised_handler.pushed = True
promised_handler.scheme = self.scheme
promised_handler.method = method.encode('utf-8')
promised_handler.host = self.host
promised_handler.path = path.encode('utf-8')
promised_handler._set_response_prop(status, headers, body)
if request_headers is None:
request_headers = []
request_headers = _encode_headers(request_headers)
request_headers.append((b':scheme', promised_handler.scheme))
request_headers.append((b':method', promised_handler.method))
request_headers.append((b':authority', promised_handler.host))
request_headers.append((b':path', promised_handler.path))
promised_handler.headers = request_headers
return self.http2.push(self, promised_handler)
def _set_response_prop(self, status, headers, body):
self.status = status
if headers is None:
headers = []
self.response_headers = _encode_headers(headers)
self.response_headers.append((b':status', str(status)\
.encode('utf-8')))
self.response_body = body
def _wrap_body(self, body):
if body is None:
return body
elif isinstance(body, str):
return io.BytesIO(body.encode('utf-8'))
elif isinstance(body, bytes):
return io.BytesIO(body)
elif isinstance(body, io.IOBase):
return body
else:
raise Exception(('body must be None or instance of str or '
'bytes or io.IOBase'))
def _encode_headers(headers):
return [(k if isinstance(k, bytes) else k.encode('utf-8'),
v if isinstance(v, bytes) else v.encode('utf-8')) \
for k, v in headers]
class _HTTP2Session(asyncio.Protocol):
def __init__(self, RequestHandlerClass):
asyncio.Protocol.__init__(self)
self.RequestHandlerClass = RequestHandlerClass
self.http2 = None
def connection_made(self, transport):
self.transport = transport
self.connection_header = cnghttp2.NGHTTP2_CLIENT_CONNECTION_PREFACE
sock = self.transport.get_extra_info('socket')
sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
ssl_ctx = self.transport.get_extra_info('sslcontext')
if ssl_ctx:
if sock.selected_npn_protocol().encode('utf-8') != \
cnghttp2.NGHTTP2_PROTO_VERSION_ID:
self.transport.abort()
def connection_lost(self, exc):
if self.http2:
self.http2 = None
def data_received(self, data):
nread = min(len(data), len(self.connection_header))
if self.connection_header.startswith(data[:nread]):
data = data[nread:]
self.connection_header = self.connection_header[nread:]
if len(self.connection_header) == 0:
try:
self.http2 = _HTTP2SessionCore\
(self.transport,
self.RequestHandlerClass)
except Exception as err:
sys.stderr.write(traceback.format_exc())
self.transport.abort()
return
self.data_received = self.data_received2
self.resume_writing = self.resume_writing2
self.data_received(data)
else:
self.transport.abort()
def data_received2(self, data):
try:
self.http2.data_received(data)
except Exception as err:
sys.stderr.write(traceback.format_exc())
self.transport.close()
return
def resume_writing2(self):
try:
self.http2.send_data()
except Exception as err:
sys.stderr.write(traceback.format_exc())
self.transport.close()
return
class HTTP2Server:
'''HTTP/2 server.
This class builds on top of the asyncio event loop. On
construction, RequestHandlerClass must be given, which must be a
subclass of BaseRequestHandler class.
'''
def __init__(self, address, RequestHandlerClass, ssl=None):
'''address is a tuple of the listening address and port (e.g.,
('127.0.0.1', 8080)). RequestHandlerClass must be a subclass
of BaseRequestHandler class to handle a HTTP/2 stream. The
ssl can be ssl.SSLContext instance. If it is not None, the
resulting server is SSL/TLS capable.
'''
def session_factory():
return _HTTP2Session(RequestHandlerClass)
self.loop = asyncio.get_event_loop()
if ssl:
ssl.set_npn_protocols([cnghttp2.NGHTTP2_PROTO_VERSION_ID\
.decode('utf-8')])
coro = self.loop.create_server(session_factory,
host=address[0], port=address[1],
ssl=ssl)
self.server = self.loop.run_until_complete(coro)
def serve_forever(self):
try:
self.loop.run_forever()
finally:
self.server.close()
self.loop.close()