horizon插件构造

创建一个dashboard
mkdir opesntack_dashboard/dashboards/mydashboard
python manage.py startdash mydashboard --target=openstack_dashboard/dashboards/mydashboard

创建一个panel
mkdir opesntack_dashboard/dashboards/mydashboard/mypanel
python manage.py startpanel mypanel --target=openstack_dashboard/dashboards/mydashboard/mypanel

目录结构
mydashboard/
├── dashboard.py
├── __init__.py
├── mypanel
│   ├── __init__.py
│   ├── forms.py #表单生成类
│   ├── tables.py #表格生成类
│   ├── tabs.py #调用表格生成类(获取数据糅合tables,模板.数据)
│   ├── urls.py #url路由关系
│   ├── views.py #视图函数
│   ├── panel.py #panel关系文件
│   ├── templates #模板文件
│   │   └── mypanel
│   │       ├── _create_snapshot.html
│   │       ├── create_snapshot.html
│   │       └── index.html
├── static 静态文件目录
│   └── mydashboard
│       ├── js
│       │   └── mydashboard.js
│       └── scss
│           └── mydashboard.scss
└── templates
    └── mydashboard
        └── base.html

1.dashboard.py文件(注册horizon页面dashboard文件)
    from django.utils.translation import ugettext_lazy as _
    import horizon
    class Mygroup(horizon.PanelGroup): #子项目(panel组)类
        name = _("My Group")           #组名称
        slug = "mygroup"               #唯一标识符
        panels = ('mypanel',)          #组下的panel

    class Mydashboard(horizon.Dashboard): #dashboard类
        name = _("My Dashboard")    #dashboard名称
        slug = "mydashboard"        #唯一标识符
        panels = (Mygroup,)         # 添加子项目
        default_panel = 'mypanel'  # 添加默认显示项目

    horizon.register(Mydashboard)  #注册dashboard

2.tables.py文件(生成tables模型) 数据模型model
    from django.utils.translation ipmort ugettext_lazy as _
    from horizon import tables
    class MyFilterAction(tables.FilterAction): #表格过滤类
        name='myfilter' #定义这个类的名称

    class InstancesTable(tables.DataTable):
        #'name'检索数据,verbose_name 数据列显示的名称
        name=tables.Colum('name',verbose_name=_('Name')) #name表格字段
        status=tables.Colum('status',verbose_name=_('Status')) #状态字段
        zone=tables.Colum('zone',verbose_name=_('Zone')) 可用域字段
        image_name=tables.Colum('image',verbose_name('Image')) 镜像字段

        class Meta(object): #源数据类(instances表的元对象)
            name='instances'  #定义这个类的名称
            verbose_name=_('Instancees') #表的名称
            table_actions=(MyFilterAction,) #这个表的动作,执行MyFilterAction动作

3.tabs.py文件(tables的视图文件) 数据视图views(伪视图类)
    from django.utils.translation import ugettext_lazy as _
    from horizon import exceptions #错误调用api日志输出
    from horizon import tabs
    from openstack_dashboard import api
    from openstack_dashboard.dashboards.mydashboard.mypanel import tables

    class InstanceTab(tabs.TableTab): #获取实例数据类
        name = _("Instances Tab")         #定义了这个视图类名称
        slug = "instances_tab"            #唯一标识符
        table_classes = (tables.InstancesTable,) #需要使用的table模型
        template_name = ("horizon/common/_detail_table.html") #需要使用的tempalte模板(_detail_table分页tables模板)
        preload = False                   #数据的加载方式(默认使用api,True使用Ajax)

        def has_more_data(self, table):
            return self._has_more

        def get_instances_data(self):
            try:
                marker = self.request.GET.get(
                            tables.InstancesTable._meta.pagination_param, None) #获取当前传递的分页参数

                 #获取实例列表search_opts,marker页数,paginate是否分页,返回实例列表和带有tenant信息的request
                instances, self._has_more = api.nova.server_list(
                    self.request,
                    search_opts={'marker': marker, 'paginate': True})

                return instances
            except Exception:  #获取失败返回
                self._has_more = False
                error_message = _('Unable to get instances')
                exceptions.handle(self.request, error_message)

                return []

    class MypanelTabs(tabs.TabGroup): #tabs组类
        slug = "mypanel_tabs"         #唯一标识符
        tabs = (InstanceTab,)         #这个组存在的tab
        sticky = True                 #是否处理tables生成tables页面

4.views.py真正的views文件(总视图文件)
    from horizon import tabs
    from openstack_dashboard.dashboards.mydashboard.mypanel \
        import tabs as mydashboard_tabs

    class IndexView(tabs.TabbedTableView): #tabs试图类
        tab_group_class = mydashboard_tabs.MypanelTabs #所使用的tab视图类
        template_name = 'mydashboard/mypanel/index.html' #所使用的总模板

        def get_data(self, request, context, *args, **kwargs):
            # Add data to the context here...
            return context

5.urls.py(url路由处理文件)
    from django.conf.urls import url
    from openstack_dashboard.dashboards.mydashboard.mypanel import views
    urlpatterns = [
        url(r'^$', views.IndexView.as_view(), name='index'),
    ]

6.index模板文件(template模板)
    {% extends 'base.html' %}
    {% load i18n %}
    {% block title %}{% trans "My Panel" %}{% endblock %}

    {% block page_header %}
       {% include "horizon/common/_page_header.html" with title=_("My Panel") %}
    {% endblock page_header %}

    {% block main %}
    <div class="row">
       <div class="col-sm-12">
       {{ tab_group.render }} #嵌入tab视图函数的模板(_detail_table.html)
       </div>
    </div>
    {% endblock %}

7.编辑enable文件动态加载dashboard(文件名称_50_mydashboard.py)

    #添加dashboard到horizon
    DASHBOARD = 'mydashboard'

    #设置settings.disabled
    DISABLED = False

    #添加项目路径到app中
    ADD_INSTALLED_APPS = [
        'openstack_dashboard.dashboards.mydashboard',
    ]

8.重新运行horizon
    python manage.py runserver 0:8001

参考文档 https://docs.openstack.org/horizon/latest/contributor/tutorials/dashboard.html