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"""An example how to use sendfile[1] with gevent.
[1] http://pypi.python.org/pypi/py-sendfile/
"""
from sys import exc_info
from errno import EAGAIN
from sendfile import sendfile as original_sendfile
from gevent.socket import wait_write
def gevent_sendfile(out_fd, in_fd, offset, count):
total_sent = 0
while total_sent < count:
try:
_offset, sent = original_sendfile(out_fd, in_fd, offset + total_sent, count - total_sent)
#print '%s: sent %s [%d%%]' % (out_fd, sent, 100*total_sent/count)
total_sent += sent
except OSError:
ex = exc_info()[1]
if ex[0] == EAGAIN:
wait_write(out_fd)
else:
raise
return offset + total_sent, total_sent
def patch_sendfile():
import sendfile
sendfile.sendfile = gevent_sendfile
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