Ok but too high CPU consumption

NEWS

@@ -9,6 +9,7 @@ Enhancements and new features:
 
     * Make the left side bar width dynamic in the Curse UI #1177
     * A way to have only REST API available and disable WEB GUI access #1149
+    * Replace Matplolib by Pygal #697
     * Docker module doesn't export details about stopped containers #1152
     * Add dynamic fields in all sections of the configuration file #1204
     * Make plugins disable and export CLI option dynamical #1173

README.rst

@@ -71,6 +71,7 @@ Optional dependencies:
 - ``potsdb`` (for the OpenTSDB export module)
 - ``prometheus_client`` (for the Prometheus export module)
 - ``py-cpuinfo`` (for the Quicklook CPU info module)
+- ``pygal`` (for the graph export module)
 - ``pymdstat`` (for RAID support) [Linux-only]
 - ``pysnmp`` (for SNMP support)
 - ``pystache`` (for the action script feature)

glances/exports/glances_export.py

@@ -146,7 +146,7 @@ class GlancesExport(object):
         The method builds two lists: names and values
         and calls the export method to export the stats.
 
-        Be aware that CSV export overwrite this class and use a specific one.
+        Note: this class can be overwrite (for example in CSV and Graph).
         """
         if not self.export_enable:
             return False

glances/exports/glances_graph.py

@@ -0,0 +1,84 @@
+# -*- coding: utf-8 -*-
+#
+# This file is part of Glances.
+#
+# Copyright (C) 2018 Nicolargo <nicolas@nicolargo.com>
+#
+# Glances is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Glances is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+"""Graph exporter interface class."""
+
+from pygal import DateTimeLine
+import sys
+import os
+
+from glances.logger import logger
+from glances.compat import iteritems
+from glances.exports.glances_export import GlancesExport
+
+
+class Export(GlancesExport):
+
+    """This class manages the Graph export module."""
+
+    def __init__(self, config=None, args=None):
+        """Init the export IF."""
+        super(Export, self).__init__(config=config, args=args)
+
+        # Graph export folder path
+        self._graph_path = args.export_graph_path
+
+        # TODO: Test if the folder exist. Overwise, create it.
+        try:
+            pass
+        except IOError as e:
+            logger.critical("Cannot create the CSV file: {}".format(e))
+            sys.exit(2)
+
+        logger.info("Graph will be created in folder:: {}".format(self._graph_path))
+
+        self.export_enable = True
+
+    def exit(self):
+        """Close the files."""
+        logger.debug("Finalise export interface %s" % self.export_name)
+
+    def update(self, stats):
+        """Generate Graph file in the output folder."""
+        plugins = stats.getPluginsList()
+        for plugin_name in plugins:
+            plugin = stats._plugins[plugin_name]
+            if plugin_name in self.plugins_to_export():
+                self.export(plugin_name, plugin.get_export_history())
+
+    def export(self, title, data):
+        """Generate one graph per item from the data.
+
+        Example for the mem plugin:
+        {'percent': [
+            (datetime.datetime(2018, 3, 24, 16, 27, 47, 282070), 51.8),
+            (datetime.datetime(2018, 3, 24, 16, 27, 47, 540999), 51.9),
+            (datetime.datetime(2018, 3, 24, 16, 27, 50, 653390), 52.0),
+            (datetime.datetime(2018, 3, 24, 16, 27, 53, 749702), 52.0),
+            (datetime.datetime(2018, 3, 24, 16, 27, 56, 825660), 52.0),
+            ...
+            ]
+        }
+        """
+        for k, v in iteritems(data):
+            chart = DateTimeLine(x_label_rotation=20,
+                                 x_value_formatter=lambda dt: dt.strftime('%d, %b %Y at %I:%M:%S %p'))
+            chart.add(k, v)
+            chart.render_to_file(os.path.join(self._graph_path,
+                                              title + '.svg'))

glances/main.py

@@ -169,6 +169,10 @@ Examples of use:
                             default='./glances.json',
                             dest='export_json_file',
                             help='file path for JSON exporter')
+        parser.add_argument('--export-graph-path',
+                            default='/tmp',
+                            dest='export_graph_path',
+                            help='Folder for Graph exporter')
         # Client/Server option
         parser.add_argument('-c', '--client', dest='client',
                             help='connect to a Glances server by IPv4/IPv6 address or hostname')

optional-requirements.txt

@@ -12,6 +12,7 @@ pika
 potsdb
 prometheus_client
 py-cpuinfo
+pygal
 pymdstat
 pysnmp
 pystache