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"""Http related parsers and protocol."""
import asyncio
import collections
import zlib
from .abc import AbstractStreamWriter
from .helpers import noop
__all__ = ('StreamWriter', 'HttpVersion', 'HttpVersion10', 'HttpVersion11')
HttpVersion = collections.namedtuple('HttpVersion', ['major', 'minor'])
HttpVersion10 = HttpVersion(1, 0)
HttpVersion11 = HttpVersion(1, 1)
class StreamWriter(AbstractStreamWriter):
def __init__(self, protocol, transport, loop):
self._protocol = protocol
self._transport = transport
self.loop = loop
self.length = None
self.chunked = False
self.buffer_size = 0
self.output_size = 0
self._eof = False
self._compress = None
self._drain_waiter = None
@property
def transport(self):
return self._transport
@property
def protocol(self):
return self._protocol
def enable_chunking(self):
self.chunked = True
def enable_compression(self, encoding='deflate'):
zlib_mode = (16 + zlib.MAX_WBITS
if encoding == 'gzip' else -zlib.MAX_WBITS)
self._compress = zlib.compressobj(wbits=zlib_mode)
def _write(self, chunk):
size = len(chunk)
self.buffer_size += size
self.output_size += size
if self._transport is None or self._transport.is_closing():
raise asyncio.CancelledError('Cannot write to closing transport')
self._transport.write(chunk)
def write(self, chunk, *, drain=True, LIMIT=64*1024):
"""Writes chunk of data to a stream.
write_eof() indicates end of stream.
writer can't be used after write_eof() method being called.
write() return drain future.
"""
if self._compress is not None:
chunk = self._compress.compress(chunk)
if not chunk:
return noop()
if self.length is not None:
chunk_len = len(chunk)
if self.length >= chunk_len:
self.length = self.length - chunk_len
else:
chunk = chunk[:self.length]
self.length = 0
if not chunk:
return noop()
if chunk:
if self.chunked:
chunk_len = ('%x\r\n' % len(chunk)).encode('ascii')
chunk = chunk_len + chunk + b'\r\n'
self._write(chunk)
if self.buffer_size > LIMIT and drain:
self.buffer_size = 0
return self.drain()
return noop()
def write_headers(self, status_line, headers, SEP=': ', END='\r\n'):
"""Write request/response status and headers."""
# status + headers
headers = status_line + ''.join(
[k + SEP + v + END for k, v in headers.items()])
headers = headers.encode('utf-8') + b'\r\n'
self._write(headers)
async def write_eof(self, chunk=b''):
if self._eof:
return
if self._compress:
if chunk:
chunk = self._compress.compress(chunk)
chunk = chunk + self._compress.flush()
if chunk and self.chunked:
chunk_len = ('%x\r\n' % len(chunk)).encode('ascii')
chunk = chunk_len + chunk + b'\r\n0\r\n\r\n'
else:
if self.chunked:
if chunk:
chunk_len = ('%x\r\n' % len(chunk)).encode('ascii')
chunk = chunk_len + chunk + b'\r\n0\r\n\r\n'
else:
chunk = b'0\r\n\r\n'
if chunk:
self._write(chunk)
await self.drain()
self._eof = True
self._transport = None
async def drain(self):
"""Flush the write buffer.
The intended use is to write
await w.write(data)
await w.drain()
"""
if self._protocol.transport is not None:
await self._protocol._drain_helper()