149 lines
5.1 KiB
Python
149 lines
5.1 KiB
Python
from __future__ import unicode_literals
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import sys
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import traceback
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from io import BytesIO
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from unittest import TestCase
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from wsgiref import simple_server
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# If data is too large, socket will choke, so write chunks no larger than 32MB
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# at a time. The rationale behind the 32MB can be found on Django's Trac:
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# https://code.djangoproject.com/ticket/5596#comment:4
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MAX_SOCKET_CHUNK_SIZE = 32 * 1024 * 1024 # 32 MB
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class ServerHandler(simple_server.ServerHandler, object):
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error_status = str("500 INTERNAL SERVER ERROR")
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def write(self, data):
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"""'write()' callable as specified by PEP 3333"""
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assert isinstance(data, bytes), "write() argument must be bytestring"
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if not self.status:
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raise AssertionError("write() before start_response()")
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elif not self.headers_sent:
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# Before the first output, send the stored headers
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self.bytes_sent = len(data) # make sure we know content-length
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self.send_headers()
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else:
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self.bytes_sent += len(data)
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# XXX check Content-Length and truncate if too many bytes written?
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data = BytesIO(data)
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for chunk in iter(lambda: data.read(MAX_SOCKET_CHUNK_SIZE), b''):
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self._write(chunk)
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self._flush()
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def error_output(self, environ, start_response):
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super(ServerHandler, self).error_output(environ, start_response)
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return ['\n'.join(traceback.format_exception(*sys.exc_info()))]
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# Backport of http://hg.python.org/cpython/rev/d5af1b235dab. See #16241.
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# This can be removed when support for Python <= 2.7.3 is deprecated.
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def finish_response(self):
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try:
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if not self.result_is_file() or not self.sendfile():
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for data in self.result:
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self.write(data)
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self.finish_content()
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finally:
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self.close()
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class DummyHandler(object):
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def log_request(self, *args, **kwargs):
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pass
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class FileWrapperHandler(ServerHandler):
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def __init__(self, *args, **kwargs):
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super(FileWrapperHandler, self).__init__(*args, **kwargs)
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self.request_handler = DummyHandler()
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self._used_sendfile = False
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def sendfile(self):
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self._used_sendfile = True
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return True
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def wsgi_app(environ, start_response):
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start_response(str('200 OK'), [(str('Content-Type'), str('text/plain'))])
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return [b'Hello World!']
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def wsgi_app_file_wrapper(environ, start_response):
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start_response(str('200 OK'), [(str('Content-Type'), str('text/plain'))])
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return environ['wsgi.file_wrapper'](BytesIO(b'foo'))
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class WSGIFileWrapperTests(TestCase):
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"""
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Test that the wsgi.file_wrapper works for the builting server.
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Tests for #9659: wsgi.file_wrapper in the builtin server.
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We need to mock a couple of handlers and keep track of what
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gets called when using a couple kinds of WSGI apps.
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"""
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def test_file_wrapper_uses_sendfile(self):
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env = {'SERVER_PROTOCOL': 'HTTP/1.0'}
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handler = FileWrapperHandler(None, BytesIO(), BytesIO(), env)
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handler.run(wsgi_app_file_wrapper)
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self.assertTrue(handler._used_sendfile)
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self.assertEqual(handler.stdout.getvalue(), b'')
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self.assertEqual(handler.stderr.getvalue(), b'')
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def test_file_wrapper_no_sendfile(self):
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env = {'SERVER_PROTOCOL': 'HTTP/1.0'}
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handler = FileWrapperHandler(None, BytesIO(), BytesIO(), env)
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handler.run(wsgi_app)
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self.assertFalse(handler._used_sendfile)
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self.assertEqual(handler.stdout.getvalue().splitlines()[-1], b'Hello World!')
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self.assertEqual(handler.stderr.getvalue(), b'')
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class WriteChunkCounterHandler(ServerHandler):
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"""
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Server handler that counts the number of chunks written after headers were
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sent. Used to make sure large response body chunking works properly.
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"""
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def __init__(self, *args, **kwargs):
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super(WriteChunkCounterHandler, self).__init__(*args, **kwargs)
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self.request_handler = DummyHandler()
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self.headers_written = False
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self.write_chunk_counter = 0
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def send_headers(self):
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super(WriteChunkCounterHandler, self).send_headers()
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self.headers_written = True
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def _write(self, data):
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if self.headers_written:
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self.write_chunk_counter += 1
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self.stdout.write(data)
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def send_big_data_app(environ, start_response):
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start_response(str('200 OK'), [(str('Content-Type'), str('text/plain'))])
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# Return a blob of data that is 1.5 times the maximum chunk size.
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return [b'x' * (MAX_SOCKET_CHUNK_SIZE + MAX_SOCKET_CHUNK_SIZE // 2)]
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class ServerHandlerChunksProperly(TestCase):
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"""
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Test that the ServerHandler chunks data properly.
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Tests for #18972: The logic that performs the math to break data into
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32MB (MAX_SOCKET_CHUNK_SIZE) chunks was flawed, BUT it didn't actually
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cause any problems.
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"""
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def test_chunked_data(self):
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env = {'SERVER_PROTOCOL': 'HTTP/1.0'}
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handler = WriteChunkCounterHandler(None, BytesIO(), BytesIO(), env)
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handler.run(send_big_data_app)
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self.assertEqual(handler.write_chunk_counter, 2)
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