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from subprocess import Popen, PIPE
from io import BytesIO
# The hack of all hacks...
# The python mbox parser fails to split some messages from mj2
# correctly - they appear to be too far out of spec. However,
# formail does it right. So open a formail pipe on the mbox,
# reassemble it to one long stream with a unique separator,
# and then split it apart again in python.. Isn't it cute?
SEPARATOR = "ABCARCHBREAK123" * 50
bSEPARATOR = bytes(SEPARATOR, 'ascii')
class MailboxBreakupParser(object):
def __init__(self, fn):
self.EOF = False
if fn.endswith(".gz"):
cat = "zcat"
else:
cat = "cat"
cmd = "%s %s | formail -s /bin/sh -c 'cat && echo %s'" % (cat, fn, SEPARATOR)
self.pipe = Popen(cmd, shell=True, stdout=PIPE, stderr=PIPE)
def returncode(self):
self.pipe.wait()
return self.pipe.returncode
def stderr_output(self):
return self.pipe.stderr.read()
def __next__(self):
sio = BytesIO()
while True:
try:
l = next(self.pipe.stdout)
except StopIteration:
# End of file!
self.EOF = True
if sio.tell() == 0:
# Nothing read yet, so return None instead of an empty
# bytesio
return None
sio.seek(0)
return sio
if l.rstrip() == bSEPARATOR:
# Reached a separator. Meaning we're not at end of file,
# but we're at end of message.
sio.seek(0)
return sio
# Otherwise, append it to where we are now
sio.write(l)
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