openstack 工作流workflows

workflow讲解博客 workflows本质就是一个更加复杂的django form（表单） Workflows三要素：

    action
    steps
   workflow

WorkFlows分析------>以launch instance为例首先前台发送的url请求，在urls.py里面进行映射

openstack_dashboard/dashboards/project/instances/urls.py

  urlpatterns = [
    url(r'^$', views.IndexView.as_view(), name='index'),
    _url(r'^launch$', views.LaunchInstanceView.as_view(), name='launch'),_
    url(r'^(?P<instance_id>[^/]+)/$',
        views.DetailView.as_view(), name='detail'),
    url(INSTANCES % 'update', views.UpdateView.as_view(), name='update'),
    url(INSTANCES % 'rebuild', views.RebuildView.as_view(), name='rebuild'),
    url(INSTANCES % 'serial', views.SerialConsoleView.as_view(),
        name='serial'),
    url(INSTANCES % 'console', views.console, name='console'),
    url(INSTANCES % 'auto_console', views.auto_console, name='auto_console'),
    url(INSTANCES % 'vnc', views.vnc, name='vnc'),
    url(INSTANCES % 'spice', views.spice, name='spice'),

_url(r'^launch$', views.LaunchInstanceView.as_view(), name='launch'）为对应url映射_ 映射到openstack_dashboard/dashboards/project/instances/views.py的LaunchInstanceView

class LaunchInstanceView(workflows.WorkflowView):
    workflow_class = project_workflows.LaunchInstance

该类继承了horizon/workflows/views.py的WorkflowView，在WorkflowView中我们可以传递数据到template（模板）和action(form)中。（action 也能够传递数据到get_context_data 方法或者template中）

class WorkflowView(hz_views.ModalBackdropMixin, generic.TemplateView):

    workflow_class = None
    template_name = 'horizon/common/_workflow_base.html'
    context_object_name = "workflow"
    ajax_template_name = 'horizon/common/_workflow.html'
    step_errors = {}

    def __init__(self):
        super(WorkflowView, self).__init__()
    def get_initial(self):
        return copy.copy(self.request.GET)

    def get_workflow(self):
        """Returns the instantiated workflow class."""
        extra_context = self.get_initial()
        entry_point = self.request.GET.get("step", None)
        workflow = self.workflow_class(self.request,
                                       context_seed=extra_context,
                                       entry_point=entry_point)
        return workflow

    def get_context_data(self, **kwargs):
        return context

    def get_layout(self):
        return layout

    def get_template_names(self):
        return template

    def get_object_id(self, obj):
        return getattr(obj, "id", None)

    def get_object_display(self, obj):
        return getattr(obj, "name", None)

    def add_error_to_step(self, error_msg, step):
        self.step_errors[step] = error_msg

    def set_workflow_step_errors(self, context):

    def get(self, request, *args, **kwargs): 
        return self.render_to_response(context)

    def validate_steps(self, request, workflow, start, end):

    def post(self, request, *args, **kwargs): 
        return shortcuts.redirect(next_url or workflow.get_success_url())

sfPPP / openstack-note

openstack 工作流workflows #67