Synnefo » snf-image-creator

#!/usr/bin/env python

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import time

import StringIO

from image_creator.kamaki_wrapper import Kamaki, ClientError

from image_creator.util import MD5, FatalError

from image_creator.output.cli import OutputWthProgress

from image_creator.dialog_util import extract_image, update_background_title

PAGE_WIDTH = 70

class WizardExit(Exception):

    """Exception used to exit the wizard"""

    pass

class WizardInvalidData(Exception):

    """Exception triggered when the user provided data are invalid"""

    pass

class Wizard:

    """Represents a dialog-based wizard

    The wizard is a collection of pages that have a "Next" and a "Back" button

    on them. The pages are used to collect user data.

    """

    def __init__(self, session):

        self.session = session

        self.pages = []

        self.session['wizard'] = {}

        self.d = session['dialog']

    def add_page(self, page):

        """Add a new page to the wizard"""

        self.pages.append(page)

    def run(self):

        """Run the wizard"""

        idx = 0

        while True:

            try:

                idx += self.pages[idx].run(self.session, idx, len(self.pages))

            except WizardExit:

                return False

            except WizardInvalidData:

                continue

            if idx >= len(self.pages):

                msg = "All necessary information has been gathered:\n\n"

                for page in self.pages:

                    msg += " * %s\n" % page.info

                msg += "\nContinue with the image creation process?"

                ret = self.d.yesno(

                    msg, width=PAGE_WIDTH, height=8 + len(self.pages),

                    ok_label="Yes", cancel="Back", extra_button=1,

                    extra_label="Quit", title="Confirmation")

                if ret == self.d.DIALOG_CANCEL:

                    idx -= 1

                elif ret == self.d.DIALOG_EXTRA:

                    return False

                elif ret == self.d.DIALOG_OK:

                    return True

            if idx < 0:

                return False

class WizardPage(object):

    """Represents a page in a wizard"""

    NEXT = 1

    PREV = -1

    def __init__(self, **kargs):

        validate = kargs['validate'] if 'validate' in kargs else lambda x: x

        setattr(self, "validate", validate)

        display = kargs['display'] if 'display' in kargs else lambda x: x

        setattr(self, "display", display)

    def run(self, session, index, total):

        """Display this wizard page

        This function is used by the wizard program when accessing a page.

        """

        raise NotImplementedError

class WizardRadioListPage(WizardPage):

    """Represent a Radio List in a wizard"""

    def __init__(self, name, printable, message, choices, **kargs):

        super(WizardRadioListPage, self).__init__(**kargs)

        self.name = name

        self.printable = printable

        self.message = message

        self.choices = choices

        self.title = kargs['title'] if 'title' in kargs else ''

        self.default = kargs['default'] if 'default' in kargs else ""

    def run(self, session, index, total):

        d = session['dialog']

        w = session['wizard']

        choices = []

        for i in range(len(self.choices)):

            default = 1 if self.choices[i][0] == self.default else 0

            choices.append((self.choices[i][0], self.choices[i][1], default))

        (code, answer) = d.radiolist(

            self.message, height=10, width=PAGE_WIDTH, ok_label="Next",

            cancel="Back", choices=choices,

            title="(%d/%d) %s" % (index + 1, total, self.title))

        if code in (d.DIALOG_CANCEL, d.DIALOG_ESC):

            return self.PREV

        w[self.name] = self.validate(answer)

        self.default = answer

        self.info = "%s: %s" % (self.printable, self.display(w[self.name]))

        return self.NEXT

class WizardInputPage(WizardPage):

    """Represents an input field in a wizard"""

    def __init__(self, name, printable, message, **kargs):

        super(WizardInputPage, self).__init__(**kargs)

        self.name = name

        self.printable = printable

        self.message = message

        self.info = "%s: <none>" % self.printable

        self.title = kargs['title'] if 'title' in kargs else ''

        self.init = kargs['init'] if 'init' in kargs else ''

    def run(self, session, index, total):

        d = session['dialog']

        w = session['wizard']

        (code, answer) = d.inputbox(

            self.message, init=self.init, width=PAGE_WIDTH, ok_label="Next",

            cancel="Back", title="(%d/%d) %s" % (index + 1, total, self.title))

        if code in (d.DIALOG_CANCEL, d.DIALOG_ESC):

            return self.PREV

        value = answer.strip()

        self.init = value

        w[self.name] = self.validate(value)

        self.info = "%s: %s" % (self.printable, self.display(w[self.name]))

        return self.NEXT

def start_wizard(session):

    """Run the image creation wizard"""

    init_token = Kamaki.get_token()

    if init_token is None:

        init_token = ""

    name = WizardInputPage(

        "ImageName", "Image Name", "Please provide a name for the image:",

        title="Image Name", init=session['image'].distro)

    descr = WizardInputPage(

        "ImageDescription", "Image Description",

        "Please provide a description for the image:",

        title="Image Description", init=session['metadata']['DESCRIPTION'] if

        'DESCRIPTION' in session['metadata'] else '')

    registration = WizardRadioListPage(

        "ImageRegistration", "Registration Type",

        "Please provide a registration type:",

        [("Private", "Image is accessible only by this user"),

         ("Public", "Everyone can create VMs from this image")],

        title="Registration Type", default="Private")

    def validate_account(token):

        """Check if a token is valid"""

        d = session['dialog']

        if len(token) == 0:

            d.msgbox("The token cannot be empty", width=PAGE_WIDTH)

            raise WizardInvalidData

        account = Kamaki.get_account(token)

        if account is None:

            d.msgbox("The token you provided in not valid!", width=PAGE_WIDTH)

            raise WizardInvalidData

        return account

    account = WizardInputPage(

        "Account", "Account",

        "Please provide your ~okeanos authentication token:",

        title="~okeanos account", init=init_token, validate=validate_account,

        display=lambda account: account['username'])

    w = Wizard(session)

    w.add_page(name)

    w.add_page(descr)

    w.add_page(registration)

    w.add_page(account)

    if w.run():

        create_image(session)

    else:

        return False

    return True

def create_image(session):

    """Create an image using the information collected by the wizard"""

    d = session['dialog']

    image = session['image']

    wizard = session['wizard']

    # Save Kamaki credentials

    Kamaki.save_token(wizard['Account']['auth_token'])

    with_progress = OutputWthProgress(True)

    out = image.out

    out.add(with_progress)

    try:

        out.clear()

        #Sysprep

        image.mount(False)

        err_msg = "Unable to execute the system preparation tasks."

        if not image.mounted:

            raise FatalError("%s Couldn't mount the media." % err_msg)

        elif image.mounted_ro:

            raise FatalError("%s Couldn't mount the media read-write."

                             % err_msg)

        image.os.do_sysprep()

        metadata = image.os.meta

        image.umount()

        #Shrink

        size = image.shrink()

        session['shrinked'] = True

        update_background_title(session)

        metadata.update(image.meta)

        metadata['DESCRIPTION'] = wizard['ImageDescription']

        #MD5

        md5 = MD5(out)

        session['checksum'] = md5.compute(image.device, size)

        #Metadata

        metastring = '\n'.join(

            ['%s=%s' % (key, value) for (key, value) in metadata.items()])

        metastring += '\n'

        out.output()

        try:

            out.output("Uploading image to pithos:")

            kamaki = Kamaki(wizard['Account'], out)

            name = "%s-%s.diskdump" % (wizard['ImageName'],

                                       time.strftime("%Y%m%d%H%M"))

            pithos_file = ""

            with open(image.device, 'rb') as f:

                pithos_file = kamaki.upload(f, size, name,

                                            "(1/4)  Calculating block hashes",

                                            "(2/4)  Uploading missing blocks")

            out.output("(3/4)  Uploading metadata file ...", False)

            kamaki.upload(StringIO.StringIO(metastring), size=len(metastring),

                          remote_path="%s.%s" % (name, 'meta'))

            out.success('done')

            out.output("(4/4)  Uploading md5sum file ...", False)

            md5sumstr = '%s %s\n' % (session['checksum'], name)

            kamaki.upload(StringIO.StringIO(md5sumstr), size=len(md5sumstr),

                          remote_path="%s.%s" % (name, 'md5sum'))

            out.success('done')

            out.output()

            is_public = True if wizard['ImageRegistration'] == "Public" else \

                False

            out.output('Registering %s image with ~okeanos ...' %

                       wizard['ImageRegistration'].lower(), False)

            kamaki.register(wizard['ImageName'], pithos_file, metadata,

                            is_public)

            out.success('done')

            out.output()

        except ClientError as e:

            raise FatalError("Pithos client: %d %s" % (e.status, e.message))

    finally:

        out.remove(with_progress)

    msg = "The %s image was successfully uploaded and registered with " \

          "~okeanos. Would you like to keep a local copy of the image?" \

          % wizard['ImageRegistration'].lower()

    if not d.yesno(msg, width=PAGE_WIDTH):

        extract_image(session)

# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :