performance: Add app for system monitoring

- Using cockpit-pcp in ‘System’ section.

Signed-off-by: fred1m <frederic.le-meur@ac-versailles.fr>
[sunil: Minor grammar fix in description, minor styling]
[sunil: Drop the icon completely in favor of just the font icon]
Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>

plinth/modules/performance/__init__.py

@@ -0,0 +1,86 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+"""
+FreedomBox app for System Monitoring (cockpit-pcp) in ‘System’.
+"""
+
+from django.utils.translation import ugettext_lazy as _
+
+from plinth import app as app_module
+from plinth import menu
+from plinth.daemon import Daemon
+
+from .manifest import clients
+
+version = 1
+
+name = _('Performance')
+
+managed_services = [
+    'pmcd.service', 'pmie.service', 'pmlogger.service', 'pmproxy.service'
+]
+
+managed_packages = ['cockpit-pcp']
+
+_description = [
+    ('Performance app allows you to collect, store and view information about '
+     'utilization of the hardware. This can give you basic insights into '
+     'usage patterns and whether the hardware is overloaded by users and '
+     'services.'),
+    ('Performance metrics are collected by Performance Co-Pilot and can be '
+     'viewed using the Cockpit app.'),
+]
+
+app = None
+
+
+class PerformanceApp(app_module.App):
+    """FreedomBox app for Performance."""
+
+    app_id = 'performance'
+
+    def __init__(self):
+        """Create components for the app."""
+        super().__init__()
+        info = app_module.Info(app_id=self.app_id, version=version,
+                               name=_('Performance'), icon='fa-bar-chart',
+                               short_description=_('System Monitoring'),
+                               description=_description,
+                               manual_page='Performance', clients=clients)
+        self.add(info)
+
+        menu_item = menu.Menu('menu-performance', info.name,
+                              info.short_description, info.icon,
+                              'performance:index', parent_url_name='system')
+        self.add(menu_item)
+
+        daemon_0 = Daemon('daemon-performance-0', managed_services[0],
+                          listen_ports=None)
+        self.add(daemon_0)
+
+        daemon_1 = Daemon('daemon-performance-1', managed_services[1],
+                          listen_ports=None)
+        self.add(daemon_1)
+
+        daemon_2 = Daemon('daemon-performance-2', managed_services[2],
+                          listen_ports=None)
+        self.add(daemon_2)
+
+        daemon_3 = Daemon('daemon-performance-3', managed_services[3],
+                          listen_ports=None)
+        self.add(daemon_3)
+
+
+def init():
+    """Initialize the Performance module."""
+    global app
+    app = PerformanceApp()
+
+    setup_helper = globals()['setup_helper']
+    if setup_helper.get_state() != 'needs-setup' and app.is_enabled():
+        app.set_enabled(True)
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(managed_packages)
+    helper.call('post', app.enable)

plinth/modules/performance/data/etc/plinth/modules-enabled/performance

@@ -0,0 +1 @@
+plinth.modules.performance

plinth/modules/performance/data/etc/security/access.d/10freedombox-performance.conf

@@ -0,0 +1 @@
++:pcp:cron

plinth/modules/performance/manifest.py

@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+"""
+FreedomBox app for System Monitoring (cockpit-pcp) in ‘System’.
+"""
+
+from django.utils.translation import ugettext_lazy as _
+from plinth.clients import validate
+
+clients = validate([{
+    'name': _('Cockpit'),
+    'platforms': [{
+        'type': 'web',
+        'url': '/_cockpit/'
+    }]
+}])

plinth/modules/performance/urls.py

@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+"""
+FreedomBox app for System Monitoring (cockpit-pcp) in ‘System’.
+"""
+
+from django.conf.urls import url
+
+from plinth.views import AppView
+
+urlpatterns = [
+    url(r'^sys/performance/$', AppView.as_view(app_id='performance'),
+        name='index'),
+]