def readline(self, size=-1):
buf = self._rbuf
buf.seek(0, 2) # seek end
if buf.tell() > 0:
# check if we already have it in our buffer
buf.seek(0)
bline = buf.readline(size)
if bline.endswith('\n') or len(bline) == size:
self._rbuf = io.BytesIO()
self._rbuf.write(buf.read())
return bline
del bline
if size < 0:
# Read until \n or EOF, whichever comes first
if self._rbufsize <= 1:
# Speed up unbuffered case
buf.seek(0)
buffers = [buf.read()]
# reset _rbuf. we consume it via buf.
self._rbuf = io.BytesIO()
data = None
recv = self.recv
while data != '\n':
data = recv(1)
if not data:
break
buffers.append(data)
return ''.join(buffers)
buf.seek(0, 2) # seek end
# reset _rbuf. we consume it via buf.
self._rbuf = io.BytesIO()
while True:
data = self.recv(self._rbufsize)
if not data:
break
nl = data.find('\n')
if nl >= 0:
nl += 1
buf.write(data[:nl])
self._rbuf.write(data[nl:])
del data
break
buf.write(data)
return buf.getvalue()
else:
# Read until size bytes or \n or EOF seen, whichever comes
# first
buf.seek(0, 2) # seek end
buf_len = buf.tell()
if buf_len >= size:
buf.seek(0)
rv = buf.read(size)
self._rbuf = io.BytesIO()
self._rbuf.write(buf.read())
return rv
# reset _rbuf. we consume it via buf.
self._rbuf = io.BytesIO()
while True:
data = self.recv(self._rbufsize)
if not data:
break
left = size - buf_len
# did we just receive a newline?
nl = data.find('\n', 0, left)
if nl >= 0:
nl += 1
# save the excess data to _rbuf
self._rbuf.write(data[nl:])
if buf_len:
buf.write(data[:nl])
break
else:
# Shortcut. Avoid data copy through buf when
# returning a substring of our first recv().
return data[:nl]
n = len(data)
if n == size and not buf_len:
# Shortcut. Avoid data copy through buf when
# returning exactly all of our first recv().
return data
if n >= left:
buf.write(data[:left])
self._rbuf.write(data[left:])
break
buf.write(data)
buf_len += n
# assert buf_len == buf.tell()
return buf.getvalue()
def read(self, size=-1):
# Use max, disallow tiny reads in a loop as they are very
# inefficient.
# We never leave read() with any leftover data from a new recv()
# call in our internal buffer.
rbufsize = max(self._rbufsize, self.default_bufsize)
# Our use of StringIO rather than lists of string objects returned
# by recv() minimizes memory usage and fragmentation that occurs
# when rbufsize is large compared to the typical return value of
# recv().
buf = self._rbuf
buf.seek(0, 2) # seek end
if size < 0:
# Read until EOF
# reset _rbuf. we consume it via buf.
self._rbuf = io.BytesIO()
while True:
data = self.recv(rbufsize)
if not data:
break
buf.write(data)
return buf.getvalue()
else:
# Read until size bytes or EOF seen, whichever comes first
buf_len = buf.tell()
if buf_len >= size:
# Already have size bytes in our buffer? Extract and
# return.
buf.seek(0)
rv = buf.read(size)
self._rbuf = io.BytesIO()
self._rbuf.write(buf.read())
return rv
# reset _rbuf. we consume it via buf.
self._rbuf = io.BytesIO()
while True:
left = size - buf_len
# recv() will malloc the amount of memory given as its
# parameter even though it often returns much less data
# than that. The returned data string is short lived
# as we copy it into a StringIO and free it. This avoids
# fragmentation issues on many platforms.
data = self.recv(left)
if not data:
break
n = len(data)
if n == size and not buf_len:
# Shortcut. Avoid buffer data copies when:
# - We have no data in our buffer.
# AND
# - Our call to recv returned exactly the
# number of bytes we were asked to read.
return data
if n == left:
buf.write(data)
del data # explicit free
break
assert n <= left, 'recv(%d) returned %d bytes' % (left, n)
buf.write(data)
buf_len += n
del data # explicit free
# assert buf_len == buf.tell()
return buf.getvalue()
def test_stream_read_write_invalid_checksum():
swift = FakeSwiftStorage(fail_checksum=True, **base_args)
assert not swift.exists("somepath")
with pytest.raises(IOError):
swift.stream_write("somepath", io.BytesIO(b"some content here"))
