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Python Open Source » Build » Buildbot 
Buildbot » buildbot 0.8.0 » buildbot » steps » transfer.py
# -*- test-case-name: buildbot.test.test_transfer -*-

import os.path, tarfile, tempfile
from twisted.internet import reactor
from twisted.spread import pb
from twisted.python import log
from buildbot.process.buildstep import RemoteCommand,BuildStep
from buildbot.process.buildstep import SUCCESS,FAILURE,SKIPPED
from buildbot.interfaces import BuildSlaveTooOldError


class _FileWriter(pb.Referenceable):
    """
    Helper class that acts as a file-object with write access
    """

    def __init__(self, destfile, maxsize, mode):
        # Create missing directories.
        destfile = os.path.abspath(destfile)
        dirname = os.path.dirname(destfile)
        if not os.path.exists(dirname):
            os.makedirs(dirname)

        self.destfile = destfile
        self.fp = open(destfile, "wb")
        if mode is not None:
            os.chmod(destfile, mode)
        self.remaining = maxsize

    def remote_write(self, data):
        """
        Called from remote slave to write L{data} to L{fp} within boundaries
        of L{maxsize}

        @type  data: C{string}
        @param data: String of data to write
        """
        if self.remaining is not None:
            if len(data) > self.remaining:
                data = data[:self.remaining]
            self.fp.write(data)
            self.remaining = self.remaining - len(data)
        else:
            self.fp.write(data)

    def remote_close(self):
        """
        Called by remote slave to state that no more data will be transfered
        """
        self.fp.close()
        self.fp = None

    def __del__(self):
        # unclean shutdown, the file is probably truncated, so delete it
        # altogether rather than deliver a corrupted file
        fp = getattr(self, "fp", None)
        if fp:
            fp.close()
            os.unlink(self.destfile)


def _extractall(self, path=".", members=None):
    """Fallback extractall method for TarFile, in case it doesn't have its own."""

    import copy

    directories = []

    if members is None:
        members = self

    for tarinfo in members:
        if tarinfo.isdir():
            # Extract directories with a safe mode.
            directories.append(tarinfo)
            tarinfo = copy.copy(tarinfo)
            tarinfo.mode = 0700
        self.extract(tarinfo, path)

    # Reverse sort directories.
    directories.sort(lambda a, b: cmp(a.name, b.name))
    directories.reverse()

    # Set correct owner, mtime and filemode on directories.
    for tarinfo in directories:
        dirpath = os.path.join(path, tarinfo.name)
        try:
            self.chown(tarinfo, dirpath)
            self.utime(tarinfo, dirpath)
            self.chmod(tarinfo, dirpath)
        except tarfile.ExtractError, e:
            if self.errorlevel > 1:
                raise
            else:
                self._dbg(1, "tarfile: %s" % e)

class _DirectoryWriter(_FileWriter):
    """
    A DirectoryWriter is implemented as a FileWriter, with an added post-processing
    step to unpack the archive, once the transfer has completed.
    """

    def __init__(self, destroot, maxsize, compress, mode):
        self.destroot = destroot

        self.fd, self.tarname = tempfile.mkstemp()
        self.compress = compress
        _FileWriter.__init__(self, self.tarname, maxsize, mode)

    def remote_unpack(self):
        """
        Called by remote slave to state that no more data will be transfered
        """
        if self.fp:
            self.fp.close()
            self.fp = None
        fileobj = os.fdopen(self.fd, 'rb')
        if self.compress == 'bz2':
            mode='r|bz2'
        elif self.compress == 'gz':
            mode='r|gz'
        else:
            mode = 'r'
        if not hasattr(tarfile.TarFile, 'extractall'):
            tarfile.TarFile.extractall = _extractall
        archive = tarfile.open(name=self.tarname, mode=mode, fileobj=fileobj)
        archive.extractall(path=self.destroot)
        archive.close()
        fileobj.close()
        os.remove(self.tarname)


class StatusRemoteCommand(RemoteCommand):
    def __init__(self, remote_command, args):
        RemoteCommand.__init__(self, remote_command, args)

        self.rc = None
        self.stderr = ''

    def remoteUpdate(self, update):
        #log.msg('StatusRemoteCommand: update=%r' % update)
        if 'rc' in update:
            self.rc = update['rc']
        if 'stderr' in update:
            self.stderr = self.stderr + update['stderr'] + '\n'

class _TransferBuildStep(BuildStep):
    """
    Base class for FileUpload and FileDownload to factor out common
    functionality.
    """
    DEFAULT_WORKDIR = "build"           # is this redundant?

    def setDefaultWorkdir(self, workdir):
        if self.workdir is None:
            self.workdir = workdir

    def _getWorkdir(self):
        properties = self.build.getProperties()
        if self.workdir is None:
            workdir = self.DEFAULT_WORKDIR
        else:
            workdir = self.workdir
        return properties.render(workdir)

    def finished(self, result):
        # Subclasses may choose to skip a transfer. In those cases, self.cmd
        # will be None, and we should just let BuildStep.finished() handle
        # the rest
        if result == SKIPPED:
            return BuildStep.finished(self, SKIPPED)
        if self.cmd.stderr != '':
            self.addCompleteLog('stderr', self.cmd.stderr)

        if self.cmd.rc is None or self.cmd.rc == 0:
            return BuildStep.finished(self, SUCCESS)
        return BuildStep.finished(self, FAILURE)


class FileUpload(_TransferBuildStep):
    """
    Build step to transfer a file from the slave to the master.

    arguments:

    - ['slavesrc']   filename of source file at slave, relative to workdir
    - ['masterdest'] filename of destination file at master
    - ['workdir']    string with slave working directory relative to builder
                     base dir, default 'build'
    - ['maxsize']    maximum size of the file, default None (=unlimited)
    - ['blocksize']  maximum size of each block being transfered
    - ['mode']       file access mode for the resulting master-side file.
                     The default (=None) is to leave it up to the umask of
                     the buildmaster process.

    """

    name = 'upload'

    def __init__(self, slavesrc, masterdest,
                 workdir=None, maxsize=None, blocksize=16*1024, mode=None,
                 **buildstep_kwargs):
        BuildStep.__init__(self, **buildstep_kwargs)
        self.addFactoryArguments(slavesrc=slavesrc,
                                 masterdest=masterdest,
                                 workdir=workdir,
                                 maxsize=maxsize,
                                 blocksize=blocksize,
                                 mode=mode,
                                 )

        self.slavesrc = slavesrc
        self.masterdest = masterdest
        self.workdir = workdir
        self.maxsize = maxsize
        self.blocksize = blocksize
        assert isinstance(mode, (int, type(None)))
        self.mode = mode

    def start(self):
        version = self.slaveVersion("uploadFile")
        properties = self.build.getProperties()

        if not version:
            m = "slave is too old, does not know about uploadFile"
            raise BuildSlaveTooOldError(m)

        source = properties.render(self.slavesrc)
        masterdest = properties.render(self.masterdest)
        # we rely upon the fact that the buildmaster runs chdir'ed into its
        # basedir to make sure that relative paths in masterdest are expanded
        # properly. TODO: maybe pass the master's basedir all the way down
        # into the BuildStep so we can do this better.
        masterdest = os.path.expanduser(masterdest)
        log.msg("FileUpload started, from slave %r to master %r"
                % (source, masterdest))

        self.step_status.setText(['uploading', os.path.basename(source)])

        # we use maxsize to limit the amount of data on both sides
        fileWriter = _FileWriter(masterdest, self.maxsize, self.mode)

        # default arguments
        args = {
            'slavesrc': source,
            'workdir': self._getWorkdir(),
            'writer': fileWriter,
            'maxsize': self.maxsize,
            'blocksize': self.blocksize,
            }

        self.cmd = StatusRemoteCommand('uploadFile', args)
        d = self.runCommand(self.cmd)
        d.addCallback(self.finished).addErrback(self.failed)


class DirectoryUpload(BuildStep):
    """
    Build step to transfer a directory from the slave to the master.

    arguments:

    - ['slavesrc']   name of source directory at slave, relative to workdir
    - ['masterdest'] name of destination directory at master
    - ['workdir']    string with slave working directory relative to builder
                     base dir, default 'build'
    - ['maxsize']    maximum size of the compressed tarfile containing the
                     whole directory
    - ['blocksize']  maximum size of each block being transfered
    - ['compress']   compression type to use: one of [None, 'gz', 'bz2']

    """

    name = 'upload'

    def __init__(self, slavesrc, masterdest,
                 workdir="build", maxsize=None, blocksize=16*1024,
                 compress=None, **buildstep_kwargs):
        BuildStep.__init__(self, **buildstep_kwargs)
        self.addFactoryArguments(slavesrc=slavesrc,
                                 masterdest=masterdest,
                                 workdir=workdir,
                                 maxsize=maxsize,
                                 blocksize=blocksize,
                                 compress=compress,
                                 )

        self.slavesrc = slavesrc
        self.masterdest = masterdest
        self.workdir = workdir
        self.maxsize = maxsize
        self.blocksize = blocksize
        assert compress in (None, 'gz', 'bz2')
        self.compress = compress

    def start(self):
        version = self.slaveVersion("uploadDirectory")
        properties = self.build.getProperties()

        if not version:
            m = "slave is too old, does not know about uploadDirectory"
            raise BuildSlaveTooOldError(m)

        source = properties.render(self.slavesrc)
        masterdest = properties.render(self.masterdest)
        # we rely upon the fact that the buildmaster runs chdir'ed into its
        # basedir to make sure that relative paths in masterdest are expanded
        # properly. TODO: maybe pass the master's basedir all the way down
        # into the BuildStep so we can do this better.
        masterdest = os.path.expanduser(masterdest)
        log.msg("DirectoryUpload started, from slave %r to master %r"
                % (source, masterdest))

        self.step_status.setText(['uploading', os.path.basename(source)])
        
        # we use maxsize to limit the amount of data on both sides
        dirWriter = _DirectoryWriter(masterdest, self.maxsize, self.compress, 0600)

        # default arguments
        args = {
            'slavesrc': source,
            'workdir': self.workdir,
            'writer': dirWriter,
            'maxsize': self.maxsize,
            'blocksize': self.blocksize,
            'compress': self.compress
            }

        self.cmd = StatusRemoteCommand('uploadDirectory', args)
        d = self.runCommand(self.cmd)
        d.addCallback(self.finished).addErrback(self.failed)

    def finished(self, result):
        # Subclasses may choose to skip a transfer. In those cases, self.cmd
        # will be None, and we should just let BuildStep.finished() handle
        # the rest
        if result == SKIPPED:
            return BuildStep.finished(self, SKIPPED)
        if self.cmd.stderr != '':
            self.addCompleteLog('stderr', self.cmd.stderr)

        if self.cmd.rc is None or self.cmd.rc == 0:
            return BuildStep.finished(self, SUCCESS)
        return BuildStep.finished(self, FAILURE)




class _FileReader(pb.Referenceable):
    """
    Helper class that acts as a file-object with read access
    """

    def __init__(self, fp):
        self.fp = fp

    def remote_read(self, maxlength):
        """
        Called from remote slave to read at most L{maxlength} bytes of data

        @type  maxlength: C{integer}
        @param maxlength: Maximum number of data bytes that can be returned

        @return: Data read from L{fp}
        @rtype: C{string} of bytes read from file
        """
        if self.fp is None:
            return ''

        data = self.fp.read(maxlength)
        return data

    def remote_close(self):
        """
        Called by remote slave to state that no more data will be transfered
        """
        if self.fp is not None:
            self.fp.close()
            self.fp = None


class FileDownload(_TransferBuildStep):
    """
    Download the first 'maxsize' bytes of a file, from the buildmaster to the
    buildslave. Set the mode of the file

    Arguments::

     ['mastersrc'] filename of source file at master
     ['slavedest'] filename of destination file at slave
     ['workdir']   string with slave working directory relative to builder
                   base dir, default 'build'
     ['maxsize']   maximum size of the file, default None (=unlimited)
     ['blocksize'] maximum size of each block being transfered
     ['mode']      use this to set the access permissions of the resulting
                   buildslave-side file. This is traditionally an octal
                   integer, like 0644 to be world-readable (but not
                   world-writable), or 0600 to only be readable by
                   the buildslave account, or 0755 to be world-executable.
                   The default (=None) is to leave it up to the umask of
                   the buildslave process.

    """
    name = 'download'

    def __init__(self, mastersrc, slavedest,
                 workdir=None, maxsize=None, blocksize=16*1024, mode=None,
                 **buildstep_kwargs):
        BuildStep.__init__(self, **buildstep_kwargs)
        self.addFactoryArguments(mastersrc=mastersrc,
                                 slavedest=slavedest,
                                 workdir=workdir,
                                 maxsize=maxsize,
                                 blocksize=blocksize,
                                 mode=mode,
                                 )

        self.mastersrc = mastersrc
        self.slavedest = slavedest
        self.workdir = workdir
        self.maxsize = maxsize
        self.blocksize = blocksize
        assert isinstance(mode, (int, type(None)))
        self.mode = mode

    def start(self):
        properties = self.build.getProperties()

        version = self.slaveVersion("downloadFile")
        if not version:
            m = "slave is too old, does not know about downloadFile"
            raise BuildSlaveTooOldError(m)

        # we are currently in the buildmaster's basedir, so any non-absolute
        # paths will be interpreted relative to that
        source = os.path.expanduser(properties.render(self.mastersrc))
        slavedest = properties.render(self.slavedest)
        log.msg("FileDownload started, from master %r to slave %r" %
                (source, slavedest))

        self.step_status.setText(['downloading', "to",
                                  os.path.basename(slavedest)])

        # setup structures for reading the file
        try:
            fp = open(source, 'rb')
        except IOError:
            # if file does not exist, bail out with an error
            self.addCompleteLog('stderr',
                                'File %r not available at master' % source)
            # TODO: once BuildStep.start() gets rewritten to use
            # maybeDeferred, just re-raise the exception here.
            reactor.callLater(0, BuildStep.finished, self, FAILURE)
            return
        fileReader = _FileReader(fp)

        # default arguments
        args = {
            'slavedest': slavedest,
            'maxsize': self.maxsize,
            'reader': fileReader,
            'blocksize': self.blocksize,
            'workdir': self._getWorkdir(),
            'mode': self.mode,
            }

        self.cmd = StatusRemoteCommand('downloadFile', args)
        d = self.runCommand(self.cmd)
        d.addCallback(self.finished).addErrback(self.failed)

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