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import io
import os
import socket
import logging
from hashlib import md5
logger = logging.getLogger(__name__)
"""Import volume job.
"""
BUFFER_LEN = 8192 * 16
HASH = md5
def __init__(self, job_manager, ev_loop, volume):
BaseThreadedJob.__init__(self, job_manager, ev_loop)
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self.checksum = None
self.volume = volume
# where the other node will connect
self.port = None
# fds
self.sock = None
self.client_sock = None
self.disk = None
def clean_fds(self):
if self.sock is not None:
self.sock.close()
self.sock = None
if self.client_sock is not None:
self.client_sock.close()
self.client_sock = None
if self.disk is not None:
self.disk.close()
self.disk = None
def pre_job(self):
"""
:returns: port number the socket is listening on
"""
# create socket
try:
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
except socket.error:
logger.exception('Error while creating socket for volume export')
self.clean_fds()
raise
try:
self.sock.settimeout(10.)
except socket.error:
logger.exception('Cannot set timeout on socket for volume export')
self.clean_fds()
raise
try:
self.sock.bind(('0.0.0.0', 0))
except socket.error:
logger.exception('Error while binding socket for volume export')
self.clean_fds()
raise
try:
self.sock.listen(1)
except socket.error:
logger.exception('Error while listening on socket')
self.clean_fds()
raise
# open local disk
try:
self.disk = io.open(self.volume.path, 'wb', 0)
except IOError:
logger.exception('Error while trying to open local disk')
self.clean_fds()
raise
self.port = self.sock.getsockname()[1]
return self.port
def run_job(self):
# FIXME raised exceptions in this functions will be in the context of a
# thread that is not running in the sjRPC, therefore these won't be
# caught
try:
self.client_sock, _ = self.sock.accept()
except socket.timeout:
logger.exception('Error for importing job: client did not connect')
self.clean_fds()
raise
except socket.error:
logger.exception('Error while accepting socket')
self.clean_fds()
raise
# close the listening socket
self.sock.close()
self.sock = None
checksum = self.HASH()
# start downloading disk image
while self.running:
try:
received = [] # keep a list of received buffers in order to do
# only one concatenation in the end
total_received = 0
while True:
recv_buf = self.client_sock.recv(self.BUFFER_LEN - total_received)
# logger.debug('Received %d', len(recv_buf))
if not recv_buf: # EOF
# in case received in not empty, we will come back here
# once again and it returns EOF one more time
break
total_received += len(recv_buf)
received.append(recv_buf)
if total_received == self.BUFFER_LEN:
break
except socket.error:
logger.exception('Error while receiving disk image')
self.clean_fds()
raise
buffer_ = b''.join(received)
if not buffer_:
logger.debug('Received EOF import job')
break
checksum.update(buffer_)
try:
written = 0
# FIXME never write small chuncks
# in which case does disk.write would not write all the buffer ?
to_send = buffer_
while True:
written += self.disk.write(to_send)
# logger.debug('Written %s to disk', written)
to_send = buffer(buffer_, written)
if not to_send:
break
except IOError:
logger.exception('Error while writing image to disk')
self.clean_fds()
raise
# here we could not have received the full disk but we don't consider
# this as an error in the import part
self.checksum = checksum.hexdigest()
# clean the fds
self.clean_fds()
logger.debug('Volume import done')
"""Export volume job.
"""
BUFFER_LEN = 8192 * 16
HASH = md5
def __init__(self, job_manager, ev_loop, volume, raddr, rport):
"""
:param volume: :class:`Volume` instance
:param raddr: remote IP address
:param rport: remote TCP port
"""
BaseThreadedJob.__init__(self, job_manager, ev_loop)
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# where to connect to send the volume
self.raddr = raddr
self.rport = rport
self.volume = volume
self.checksum = None
# fds
self.sock = None
self.disk = None
def clean_fds(self):
if self.sock is not None:
self.sock.close()
self.sock = None
if self.disk is not None:
self.disk.close()
self.disk = None
def pre_job(self):
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# connect to the remote host
try:
self.sock.connect((self.raddr, self.rport))
except socket.error as exc:
logger.exception('Error while trying to connect to remote host %s',
os.strerror(exc.errno))
self.clean_fds()
raise
# open local volume
try:
self.disk = io.open(self.volume.path, 'rb', 0)
except IOError:
logger.exception('Error while opening disk for export job')
self.clean_fds()
raise
def run_job(self):
checksum = self.HASH()
# sent_count = 0
# do copy
while self.running:
try:
read = self.disk.read(self.BUFFER_LEN)
except IOError:
logger.exception('Error while reading from disk')
self.clean_fds()
break
# read length may be less than BUFFER_LEN but we don't care as it
# will go over TCP
if not read: # end of file
# logger.debug('EOF, exported %d bytes', sent_count)
break
# sent_count += len(read)
# logger.debug('Read %d from disk', len(read))
checksum.update(read)
try:
self.sock.sendall(read)
except socket.error:
logger.exception('Error while sending through socket')
self.clean_fds()
break
self.checksum = checksum.hexdigest()
self.clean_fds()