root / lib / impexpd / __init__.py @ 0559f745
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# Copyright (C) 2010 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Classes and functions for import/export daemon.
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"""
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import os |
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import re |
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import socket |
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import logging |
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import signal |
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import errno |
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import time |
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from cStringIO import StringIO |
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from ganeti import constants |
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from ganeti import errors |
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from ganeti import utils |
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#: Used to recognize point at which socat(1) starts to listen on its socket.
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#: The local address is required for the remote peer to connect (in particular
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#: the port number).
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LISTENING_RE = re.compile(r"^listening on\s+"
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r"AF=(?P<family>\d+)\s+"
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r"(?P<address>.+):(?P<port>\d+)$", re.I)
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#: Used to recognize point at which socat(1) is sending data over the wire
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TRANSFER_LOOP_RE = re.compile(r"^starting data transfer loop with FDs\s+.*$",
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re.I) |
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SOCAT_LOG_DEBUG = "D"
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SOCAT_LOG_INFO = "I"
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SOCAT_LOG_NOTICE = "N"
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SOCAT_LOG_WARNING = "W"
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SOCAT_LOG_ERROR = "E"
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SOCAT_LOG_FATAL = "F"
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SOCAT_LOG_IGNORE = frozenset([
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SOCAT_LOG_DEBUG, |
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SOCAT_LOG_INFO, |
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SOCAT_LOG_NOTICE, |
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]) |
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#: Used to parse GNU dd(1) statistics
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DD_INFO_RE = re.compile(r"^(?P<bytes>\d+)\s*byte(?:|s)\s.*\scopied,\s*"
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r"(?P<seconds>[\d.]+)\s*s(?:|econds),.*$", re.I)
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#: Used to ignore "N+N records in/out" on dd(1)'s stderr
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DD_STDERR_IGNORE = re.compile(r"^\d+\+\d+\s*records\s+(?:in|out)$", re.I)
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#: Signal upon which dd(1) will print statistics (on some platforms, SIGINFO is
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#: unavailable and SIGUSR1 is used instead)
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DD_INFO_SIGNAL = getattr(signal, "SIGINFO", signal.SIGUSR1) |
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#: Buffer size: at most this many bytes are transferred at once
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BUFSIZE = 1024 * 1024 |
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# Common options for socat
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SOCAT_TCP_OPTS = ["keepalive", "keepidle=60", "keepintvl=10", "keepcnt=5"] |
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SOCAT_OPENSSL_OPTS = ["verify=1", "cipher=HIGH", "method=TLSv1"] |
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SOCAT_OPTION_MAXLEN = 400
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(PROG_OTHER, |
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PROG_SOCAT, |
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PROG_DD, |
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PROG_DD_PID, |
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PROG_EXP_SIZE) = range(1, 6) |
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PROG_ALL = frozenset([
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PROG_OTHER, |
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PROG_SOCAT, |
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PROG_DD, |
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PROG_DD_PID, |
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PROG_EXP_SIZE, |
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]) |
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class CommandBuilder(object): |
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def __init__(self, mode, opts, socat_stderr_fd, dd_stderr_fd, dd_pid_fd): |
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"""Initializes this class.
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@param mode: Daemon mode (import or export)
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@param opts: Options object
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@type socat_stderr_fd: int
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@param socat_stderr_fd: File descriptor socat should write its stderr to
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@type dd_stderr_fd: int
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@param dd_stderr_fd: File descriptor dd should write its stderr to
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@type dd_pid_fd: int
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@param dd_pid_fd: File descriptor the child should write dd's PID to
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"""
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self._opts = opts
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self._mode = mode
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self._socat_stderr_fd = socat_stderr_fd
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self._dd_stderr_fd = dd_stderr_fd
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self._dd_pid_fd = dd_pid_fd
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@staticmethod
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def GetBashCommand(cmd): |
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"""Prepares a command to be run in Bash.
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"""
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return ["bash", "-o", "errexit", "-o", "pipefail", "-c", cmd] |
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def _GetSocatCommand(self): |
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"""Returns the socat command.
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"""
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common_addr_opts = SOCAT_TCP_OPTS + SOCAT_OPENSSL_OPTS + [ |
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"key=%s" % self._opts.key, |
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"cert=%s" % self._opts.cert, |
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"cafile=%s" % self._opts.ca, |
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] |
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if self._opts.bind is not None: |
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common_addr_opts.append("bind=%s" % self._opts.bind) |
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if self._mode == constants.IEM_IMPORT: |
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if self._opts.port is None: |
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port = 0
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else:
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port = self._opts.port
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addr1 = [ |
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"OPENSSL-LISTEN:%s" % port,
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"reuseaddr",
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# Retry to listen if connection wasn't established successfully, up to
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# 100 times a second. Note that this still leaves room for DoS attacks.
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"forever",
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"intervall=0.01",
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] + common_addr_opts |
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addr2 = ["stdout"]
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elif self._mode == constants.IEM_EXPORT: |
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addr1 = ["stdin"]
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addr2 = [ |
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"OPENSSL:%s:%s" % (self._opts.host, self._opts.port), |
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# How long to wait per connection attempt
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"connect-timeout=%s" % self._opts.connect_timeout, |
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# Retry a few times before giving up to connect (once per second)
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"retry=%s" % self._opts.connect_retries, |
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"intervall=1",
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] + common_addr_opts |
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else:
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raise errors.GenericError("Invalid mode '%s'" % self._mode) |
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for i in [addr1, addr2]: |
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for value in i: |
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if len(value) > SOCAT_OPTION_MAXLEN: |
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raise errors.GenericError("Socat option longer than %s" |
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" characters: %r" %
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(SOCAT_OPTION_MAXLEN, value)) |
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if "," in value: |
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raise errors.GenericError("Comma not allowed in socat option" |
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" value: %r" % value)
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return [
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constants.SOCAT_PATH, |
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# Log to stderr
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"-ls",
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# Log level
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"-d", "-d", |
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# Buffer size
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"-b%s" % BUFSIZE,
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# Unidirectional mode, the first address is only used for reading, and the
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# second address is only used for writing
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"-u",
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",".join(addr1), ",".join(addr2) |
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] |
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def _GetTransportCommand(self): |
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"""Returns the command for the transport part of the daemon.
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"""
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socat_cmd = ("%s 2>&%d" %
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(utils.ShellQuoteArgs(self._GetSocatCommand()),
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self._socat_stderr_fd))
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dd_cmd = StringIO() |
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# Setting LC_ALL since we want to parse the output and explicitely
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# redirecting stdin, as the background process (dd) would have /dev/null as
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# stdin otherwise
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dd_cmd.write("{ LC_ALL=C dd bs=%s <&0 2>&%d & pid=${!};" %
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(BUFSIZE, self._dd_stderr_fd))
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# Send PID to daemon
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dd_cmd.write(" echo $pid >&%d;" % self._dd_pid_fd) |
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# And wait for dd
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dd_cmd.write(" wait $pid;")
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dd_cmd.write(" }")
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compr = self._opts.compress
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assert compr in constants.IEC_ALL |
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if self._mode == constants.IEM_IMPORT: |
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if compr == constants.IEC_GZIP:
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transport_cmd = "%s | gunzip -c" % socat_cmd
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else:
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transport_cmd = socat_cmd |
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transport_cmd += " | %s" % dd_cmd.getvalue()
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elif self._mode == constants.IEM_EXPORT: |
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if compr == constants.IEC_GZIP:
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transport_cmd = "gzip -c | %s" % socat_cmd
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else:
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transport_cmd = socat_cmd |
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transport_cmd = "%s | %s" % (dd_cmd.getvalue(), transport_cmd)
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else:
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raise errors.GenericError("Invalid mode '%s'" % self._mode) |
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# TODO: Run transport as separate user
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# The transport uses its own shell to simplify running it as a separate user
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# in the future.
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return self.GetBashCommand(transport_cmd) |
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def GetCommand(self): |
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"""Returns the complete child process command.
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"""
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transport_cmd = self._GetTransportCommand()
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buf = StringIO() |
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if self._opts.cmd_prefix: |
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buf.write(self._opts.cmd_prefix)
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buf.write(" ")
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buf.write(utils.ShellQuoteArgs(transport_cmd)) |
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if self._opts.cmd_suffix: |
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buf.write(" ")
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buf.write(self._opts.cmd_suffix)
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return self.GetBashCommand(buf.getvalue()) |
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def _VerifyListening(family, address, port): |
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"""Verify address given as listening address by socat.
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"""
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# TODO: Implement IPv6 support
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if family != socket.AF_INET:
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raise errors.GenericError("Address family %r not supported" % family) |
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try:
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packed_address = socket.inet_pton(family, address) |
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except socket.error:
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raise errors.GenericError("Invalid address %r for family %s" % |
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(address, family)) |
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return (socket.inet_ntop(family, packed_address), port)
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class ChildIOProcessor(object): |
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def __init__(self, debug, status_file, logger, throughput_samples, exp_size): |
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"""Initializes this class.
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"""
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self._debug = debug
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self._status_file = status_file
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self._logger = logger
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self._splitter = dict([(prog, utils.LineSplitter(self._ProcessOutput, prog)) |
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for prog in PROG_ALL]) |
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self._dd_pid = None |
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self._dd_ready = False |
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self._dd_tp_samples = throughput_samples
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self._dd_progress = []
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# Expected size of transferred data
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self._exp_size = exp_size
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def GetLineSplitter(self, prog): |
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"""Returns the line splitter for a program.
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"""
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return self._splitter[prog] |
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def FlushAll(self): |
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"""Flushes all line splitters.
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"""
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for ls in self._splitter.itervalues(): |
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ls.flush() |
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def CloseAll(self): |
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"""Closes all line splitters.
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"""
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for ls in self._splitter.itervalues(): |
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ls.close() |
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self._splitter.clear()
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def NotifyDd(self): |
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"""Tells dd(1) to write statistics.
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"""
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if self._dd_pid is None: |
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# Can't notify
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return False |
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if not self._dd_ready: |
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# There's a race condition between starting the program and sending
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# signals. The signal handler is only registered after some time, so we
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# have to check whether the program is ready. If it isn't, sending a
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# signal will invoke the default handler (and usually abort the program).
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if not utils.IsProcessHandlingSignal(self._dd_pid, DD_INFO_SIGNAL): |
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logging.debug("dd is not yet ready for signal %s", DD_INFO_SIGNAL)
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return False |
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logging.debug("dd is now handling signal %s", DD_INFO_SIGNAL)
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self._dd_ready = True |
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logging.debug("Sending signal %s to PID %s", DD_INFO_SIGNAL, self._dd_pid) |
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try:
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os.kill(self._dd_pid, DD_INFO_SIGNAL)
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except EnvironmentError, err: |
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if err.errno != errno.ESRCH:
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raise
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# Process no longer exists
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logging.debug("dd exited")
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self._dd_pid = None |
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return True |
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def _ProcessOutput(self, line, prog): |
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"""Takes care of child process output.
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@type line: string
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@param line: Child output line
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@type prog: number
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@param prog: Program from which the line originates
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"""
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force_update = False
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forward_line = line |
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if prog == PROG_SOCAT:
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level = None
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parts = line.split(None, 4) |
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if len(parts) == 5: |
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(_, _, _, level, msg) = parts |
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force_update = self._ProcessSocatOutput(self._status_file, level, msg) |
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if self._debug or (level and level not in SOCAT_LOG_IGNORE): |
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forward_line = "socat: %s %s" % (level, msg)
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else:
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forward_line = None
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else:
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forward_line = "socat: %s" % line
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elif prog == PROG_DD:
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(should_forward, force_update) = self._ProcessDdOutput(line)
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if should_forward or self._debug: |
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forward_line = "dd: %s" % line
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else:
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forward_line = None
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elif prog == PROG_DD_PID:
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if self._dd_pid: |
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raise RuntimeError("dd PID reported more than once") |
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logging.debug("Received dd PID %r", line)
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self._dd_pid = int(line) |
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forward_line = None
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elif prog == PROG_EXP_SIZE:
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logging.debug("Received predicted size %r", line)
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forward_line = None
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if line:
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try:
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exp_size = utils.BytesToMebibyte(int(line))
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except (ValueError, TypeError), err: |
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logging.error("Failed to convert predicted size %r to number: %s",
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line, err) |
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exp_size = None
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else:
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exp_size = None
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self._exp_size = exp_size
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if forward_line:
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self._logger.info(forward_line)
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self._status_file.AddRecentOutput(forward_line)
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self._status_file.Update(force_update)
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@staticmethod
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def _ProcessSocatOutput(status_file, level, msg): |
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"""Interprets socat log output.
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"""
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if level == SOCAT_LOG_NOTICE:
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if status_file.GetListenPort() is None: |
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# TODO: Maybe implement timeout to not listen forever
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m = LISTENING_RE.match(msg) |
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if m:
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(_, port) = _VerifyListening(int(m.group("family")), |
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m.group("address"),
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int(m.group("port"))) |
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status_file.SetListenPort(port) |
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return True |
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if not status_file.GetConnected(): |
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m = TRANSFER_LOOP_RE.match(msg) |
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if m:
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logging.debug("Connection established")
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status_file.SetConnected() |
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return True |
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return False |
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def _ProcessDdOutput(self, line): |
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"""Interprets a line of dd(1)'s output.
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"""
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m = DD_INFO_RE.match(line) |
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if m:
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seconds = float(m.group("seconds")) |
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mbytes = utils.BytesToMebibyte(int(m.group("bytes"))) |
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self._UpdateDdProgress(seconds, mbytes)
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return (False, True) |
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m = DD_STDERR_IGNORE.match(line) |
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if m:
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# Ignore
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return (False, False) |
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# Forward line
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return (True, False) |
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def _UpdateDdProgress(self, seconds, mbytes): |
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"""Updates the internal status variables for dd(1) progress.
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@type seconds: float
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@param seconds: Timestamp of this update
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@type mbytes: float
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@param mbytes: Total number of MiB transferred so far
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"""
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# Add latest sample
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self._dd_progress.append((seconds, mbytes))
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# Remove old samples
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del self._dd_progress[:-self._dd_tp_samples] |
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# Calculate throughput
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throughput = _CalcThroughput(self._dd_progress)
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# Calculate percent and ETA
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percent = None
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eta = None
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if self._exp_size is not None: |
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if self._exp_size != 0: |
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percent = max(0, min(100, (100.0 * mbytes) / self._exp_size)) |
493 |
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if throughput:
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eta = max(0, float(self._exp_size - mbytes) / throughput) |
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self._status_file.SetProgress(mbytes, throughput, percent, eta)
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def _CalcThroughput(samples): |
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"""Calculates the throughput in MiB/second.
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@type samples: sequence
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@param samples: List of samples, each consisting of a (timestamp, mbytes)
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tuple
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@rtype: float or None
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@return: Throughput in MiB/second
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"""
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if len(samples) < 2: |
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# Can't calculate throughput
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return None |
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(start_time, start_mbytes) = samples[0]
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(end_time, end_mbytes) = samples[-1]
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return (float(end_mbytes) - start_mbytes) / (float(end_time) - start_time) |