Openstack Hrozion开发（四）

在Dashborad 上添加将Volume 备份到指定的Container 功能

在命令行下是可以通过cinder backup-create 来指定将volume 备份到不同的container 中，但是dashborad 并没有提供页面操作。

一、页面修改

进入/project/vouleme/volume/tables.py 页面添加 backup 按钮

class CreateBackup(tables.LinkAction):    name = "backup"    verbose_name = _("Create Backup")    url = "horizon:project:volumes:volumes:create_backup"    classes = ("ajax-modal","btn-camera")    policy_rules = (("volume","volume:backup"),)    def get_policy_target(self, request, datum=None):        project_id = None        if datum:            project_id = getattr(datum,"os-vol-tenant-attr:tenant_id",None)        return {"project_id":project_id}    def allowed(self, request, volume=None):        return volume.status in "available","in-use"

在viwe.py页面添加类

class CreateBackupView(forms.ModalFormView):    form_class = project_forms.CreateBackupForm    template_name = 'project/volumes/volumes/create_backup.html'    success_url = reverse_lazy("horizon:project:containers:index")    def get_context_data(self, **kwargs):        context = super(CreateBackupView, self).get_context_data(**kwargs)        context['volume_id'] = self.kwargs['volume_id']        try:            volume = cinder.volume_get(self.request, context['volume_id'])            if (volume.status == 'in-use'):                context['attached'] = True                context['form'].set_warning(_("This volume is currently "                                              "attached to an instance. "                                              "In some cases, creating a "                                              "backup from an attached "                                              "volume can result in a "                                              "corrupted backup."))            context['usages'] = quotas.tenant_limit_usages(self.request)        except Exception:            exceptions.handle(self.request,                              _('Unable to retrieve volume information.'))        return context    def get_initial(self):        return {'volume_id': self.kwargs["volume_id"]}在form.py页面添加<pre name="code" class="python">class CreateBackupForm(forms.SelfHandlingForm):    name = forms.CharField(max_length="255", label =_("Backup Name"))    container_list = forms.ChoiceField(label=_("Backup to container"),                                 help_text=_("Select a container to "                                             "backup to."))    description = forms.CharField(widget=forms.Textarea,            label=_("Description"),required=False)    def __init__(self, request, *args, **kwargs):        super(CreateBackupForm, self).__init__(request, *args, **kwargs)        # populate volume_id        volume_id = kwargs.get('initial', {}).get('volume_id', [])        self.fields['volume_id'] = forms.CharField(widget=forms.HiddenInput(),                                                   initial=volume_id)    #def populate_avialable_container_choices(self,request,context):        try:            containers = swift.swift_get_containers(request)[0]        except Exception:            containers = []            exceptions.handle(request,                              _('Unable to retrive available container.'))        container_list = []        container_list = [(container.get('name'), container.get('name'))                           for container in containers ]        container_list.sort()        if not container_list:            container_list.insert(0,("",_("No available container.")))        elif len(container_list) > 1:            container_list.insert(0,("",_("Any Available Container")))        self.fields['container_list'].choices = container_list    def handle(self, request, data):        try:            volume = cinder.volume_get(request,                                       data['volume_id'])            force = False            message = _('Creating volume backup "%s".') % data['name']            if volume.status == 'in-use':                force = True                message = _('Forcing to create backup "%s" '                            'from attached volume.') % data['name']            backup = cinder.volume_backup_create(request,                                                 data['volume_id'],                                                 data['name'],                                                 data['container_list'],                                                 data['description'])#end add            messages.info(request, message)            return backup        except Exception:            redirect = reverse("horizon:project:volumes:index")            exceptions.handle(request,                              _('Unable to create volume backup.'),                              redirect=redirect)        二、cinder api 的修改因为 cinderclient 已经集成了常用的功能，我们只需要调用api即可<pre name="code" class="python">def volume_backup_create(request,volume_id,                         name=None,container=None,description=None):    data = {'name': name,            'container': container,            'description': description}    return VolumeBackup(cinderclient(request).backups.create(        volume_id, **data))