GlancesCursesBrowser.active_server() - Code Metrics - Inspection of "Correct Grafana dashboard (error on network interf..." - nicolargo/glances - Measure and Improve Code Quality continuously with Scrutinizer

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by Nicolas

created 2016-04-28 14:44 UTC

GlancesCursesBrowser.active_server() A

↳ Parent: GlancesCursesBrowser

Complexity

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Lines	0
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Changes	2
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Metric	Value
cc	1
c	2
b	0
f	0
dl	0
loc	4
rs	10

# -*- coding: utf-8 -*-
#
# This file is part of Glances.
#
# Copyright (C) 2016 Nicolargo <[email protected]>
#
# 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/>.

"""Curses browser interface class ."""

import sys

from glances.outputs.glances_curses import _GlancesCurses

from glances.logger import logger
from glances.timer import Timer


class GlancesCursesBrowser(_GlancesCurses):

    """Class for the Glances curse client browser."""

    def __init__(self, args=None):
        # Init the father class
        super(GlancesCursesBrowser, self).__init__(args=args)

        _colors_list = {
            'UNKNOWN': self.no_color,
            'SNMP': self.default_color2,
            'ONLINE': self.default_color2,
            'OFFLINE': self.ifCRITICAL_color2,
            'PROTECTED': self.ifWARNING_color2,
        }
        self.colors_list.update(_colors_list)

        # First time scan tag
        # Used to display a specific message when the browser is started
        self.first_scan = True

        # Init refresh time
        self.__refresh_time = args.time

        # Init the cursor position for the client browser
        self.cursor_position = 0

        # Active Glances server number
        self._active_server = None

    @property
    def active_server(self):
        """Return the active server or None if it's the browser list."""
        return self._active_server

    @active_server.setter
    def active_server(self, index):
        """Set the active server or None if no server selected."""
        self._active_server = index

    @property
    def cursor(self):
        """Get the cursor position."""
        return self.cursor_position

    @cursor.setter
    def cursor(self, position):
        """Set the cursor position."""
        self.cursor_position = position

    def cursor_up(self, servers_list):
        """Set the cursor to position N-1 in the list."""
        if self.cursor_position > 0:
            self.cursor_position -= 1
        else:
            self.cursor_position = len(servers_list) - 1

    def cursor_down(self, servers_list):
        """Set the cursor to position N-1 in the list."""
        if self.cursor_position < len(servers_list) - 1:
            self.cursor_position += 1
        else:
            self.cursor_position = 0

    def __catch_key(self, servers_list):
        # Catch the browser pressed key
        self.pressedkey = self.get_key(self.term_window)

        if self.pressedkey != -1:
            logger.debug("Key pressed. Code=%s" % self.pressedkey)

        # Actions...
        if self.pressedkey == ord('\x1b') or self.pressedkey == ord('q'):
            # 'ESC'|'q' > Quit
            self.end()
            logger.info("Stop Glances client browser")
            sys.exit(0)
        elif self.pressedkey == 10:
            # 'ENTER' > Run Glances on the selected server
            logger.debug("Server number {0} selected".format(self.cursor + 1))
            self.active_server = self.cursor
        elif self.pressedkey == 65:
            # 'UP' > Up in the server list
            self.cursor_up(servers_list)
        elif self.pressedkey == 66:
            # 'DOWN' > Down in the server list
            self.cursor_down(servers_list)

        # Return the key code
        return self.pressedkey

    def update(self, servers_list):
        """Update the servers' list screen.

        Wait for __refresh_time sec / catch key every 100 ms.

        servers_list: Dict of dict with servers stats
        """
        # Flush display
        logger.debug('Servers list: {0}'.format(servers_list))
        self.flush(servers_list)

        # Wait
        exitkey = False
        countdown = Timer(self.__refresh_time)
        while not countdown.finished() and not exitkey:
            # Getkey
            pressedkey = self.__catch_key(servers_list)
            # Is it an exit or select server key ?
            exitkey = (
                pressedkey == ord('\x1b') or pressedkey == ord('q') or pressedkey == 10)
            if not exitkey and pressedkey > -1:
                # Redraw display
                self.flush(servers_list)
            # Wait 100ms...
            self.wait()

        return self.active_server

    def flush(self, servers_list):
        """Update the servers' list screen.

        servers_list: List of dict with servers stats
        """
        self.erase()
        self.display(servers_list)

    def display(self, servers_list):
        """Display the servers list.

        Return:
            True if the stats have been displayed
            False if the stats have not been displayed (no server available)
        """
        # Init the internal line/column for Glances Curses
        self.init_line_column()

        # Get the current screen size
        screen_x = self.screen.getmaxyx()[1]
        screen_y = self.screen.getmaxyx()[0]

        # Init position
        x = 0
        y = 0

        # Display top header
        if len(servers_list) == 0:
            if self.first_scan and not self.args.disable_autodiscover:
                msg = 'Glances is scanning your network. Please wait...'
                self.first_scan = False
            else:
                msg = 'No Glances server available'
        elif len(servers_list) == 1:
            msg = 'One Glances server available'
        else:
            msg = '{0} Glances servers available'.format(len(servers_list))
        if self.args.disable_autodiscover:
            msg += ' ' + '(auto discover is disabled)'
        self.term_window.addnstr(y, x,
                                 msg,
                                 screen_x - x,
                                 self.colors_list['TITLE'])

        if len(servers_list) == 0:
            return False

        # Display the Glances server list
        # ================================

        # Table of table
        # Item description: [stats_id, column name, column size]
        column_def = [
            ['name', 'Name', 16],
            ['alias', None, None],
            ['load_min5', 'LOAD', 6],
            ['cpu_percent', 'CPU%', 5],
            ['mem_percent', 'MEM%', 5],
            ['status', 'STATUS', 9],
            ['ip', 'IP', 15],
            # ['port', 'PORT', 5],
            ['hr_name', 'OS', 16],
        ]
        y = 2

        # Display table header
        xc = x + 2
        for cpt, c in enumerate(column_def):
            if xc < screen_x and y < screen_y and c[1] is not None:
                self.term_window.addnstr(y, xc,
                                         c[1],
                                         screen_x - x,
                                         self.colors_list['BOLD'])
                xc += c[2] + self.space_between_column
        y += 1

        # If a servers has been deleted from the list...
        # ... and if the cursor is in the latest position
        if self.cursor > len(servers_list) - 1:
            # Set the cursor position to the latest item
            self.cursor = len(servers_list) - 1

        # Display table
        line = 0
        for v in servers_list:
            # Get server stats
            server_stat = {}
            for c in column_def:
                try:
                    server_stat[c[0]] = v[c[0]]
                except KeyError as e:
                    logger.debug(
                        "Cannot grab stats {0} from server (KeyError: {1})".format(c[0], e))
                    server_stat[c[0]] = '?'
                # Display alias instead of name
                try:
                    if c[0] == 'alias' and v[c[0]] is not None:
                        server_stat['name'] = v[c[0]]
                except KeyError:
                    pass

            # Display line for server stats
            cpt = 0
            xc = x

            # Is the line selected ?
            if line == self.cursor:
                # Display cursor
                self.term_window.addnstr(
                    y, xc, ">", screen_x - xc, self.colors_list['BOLD'])

            # Display the line
            xc += 2
            for c in column_def:
                if xc < screen_x and y < screen_y and c[1] is not None:
                    # Display server stats
                    self.term_window.addnstr(
                        y, xc, format(server_stat[c[0]]), c[2], self.colors_list[v['status']])
                    xc += c[2] + self.space_between_column
                cpt += 1
            # Next line, next server...
            y += 1
            line += 1

        return True


1			# -- coding: utf-8 --
2			#
3			# This file is part of Glances.
4			#
5			# Copyright (C) 2016 Nicolargo <[email protected]>
6			#
7			# Glances is free software; you can redistribute it and/or modify
8			# it under the terms of the GNU Lesser General Public License as published by
9			# the Free Software Foundation, either version 3 of the License, or
10			# (at your option) any later version.
11			#
12			# Glances is distributed in the hope that it will be useful,
13			# but WITHOUT ANY WARRANTY; without even the implied warranty of
14			# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			# GNU Lesser General Public License for more details.
16			#
17			# You should have received a copy of the GNU Lesser General Public License
18			# along with this program. If not, see <http://www.gnu.org/licenses/>.
19
20			"""Curses browser interface class ."""
21
22			import sys
23
24			from glances.outputs.glances_curses import _GlancesCurses
25
26			from glances.logger import logger
27			from glances.timer import Timer
28
29
30			class GlancesCursesBrowser(_GlancesCurses):
31
32			"""Class for the Glances curse client browser."""
33
34			def __init__(self, args=None):
35			# Init the father class
36			super(GlancesCursesBrowser, self).__init__(args=args)
37
38			_colors_list = {
39			'UNKNOWN': self.no_color,
40			'SNMP': self.default_color2,
41			'ONLINE': self.default_color2,
42			'OFFLINE': self.ifCRITICAL_color2,
43			'PROTECTED': self.ifWARNING_color2,
44			}
45			self.colors_list.update(_colors_list)
46
47			# First time scan tag
48			# Used to display a specific message when the browser is started
49			self.first_scan = True
50
51			# Init refresh time
52			self.__refresh_time = args.time
53
54			# Init the cursor position for the client browser
55			self.cursor_position = 0
56
57			# Active Glances server number
58			self._active_server = None
59
60			@property
61			def active_server(self):
62			"""Return the active server or None if it's the browser list."""
63			return self._active_server
64
65			@active_server.setter
66			def active_server(self, index):
67			"""Set the active server or None if no server selected."""
68			self._active_server = index
69
70			@property
71			def cursor(self):
72			"""Get the cursor position."""
73			return self.cursor_position
74
75			@cursor.setter
76			def cursor(self, position):
77			"""Set the cursor position."""
78			self.cursor_position = position
79
80			def cursor_up(self, servers_list):
81			"""Set the cursor to position N-1 in the list."""
82			if self.cursor_position > 0:
83			self.cursor_position -= 1
84			else:
85			self.cursor_position = len(servers_list) - 1
86
87			def cursor_down(self, servers_list):
88			"""Set the cursor to position N-1 in the list."""
89			if self.cursor_position < len(servers_list) - 1:
90			self.cursor_position += 1
91			else:
92			self.cursor_position = 0
93
94			def __catch_key(self, servers_list):
95			# Catch the browser pressed key
96			self.pressedkey = self.get_key(self.term_window)
97
98			if self.pressedkey != -1:
99			logger.debug("Key pressed. Code=%s" % self.pressedkey)
100
101			# Actions...
102			if self.pressedkey == ord('\x1b') or self.pressedkey == ord('q'):
103			# 'ESC'\|'q' > Quit
104			self.end()
105			logger.info("Stop Glances client browser")
106			sys.exit(0)
107			elif self.pressedkey == 10:
108			# 'ENTER' > Run Glances on the selected server
109			logger.debug("Server number {0} selected".format(self.cursor + 1))
110			self.active_server = self.cursor
111			elif self.pressedkey == 65:
112			# 'UP' > Up in the server list
113			self.cursor_up(servers_list)
114			elif self.pressedkey == 66:
115			# 'DOWN' > Down in the server list
116			self.cursor_down(servers_list)
117
118			# Return the key code
119			return self.pressedkey
120
121			def update(self, servers_list):
122			"""Update the servers' list screen.
123
124			Wait for __refresh_time sec / catch key every 100 ms.
125
126			servers_list: Dict of dict with servers stats
127			"""
128			# Flush display
129			logger.debug('Servers list: {0}'.format(servers_list))
130			self.flush(servers_list)
131
132			# Wait
133			exitkey = False
134			countdown = Timer(self.__refresh_time)
135			while not countdown.finished() and not exitkey:
136			# Getkey
137			pressedkey = self.__catch_key(servers_list)
138			# Is it an exit or select server key ?
139			exitkey = (
140			pressedkey == ord('\x1b') or pressedkey == ord('q') or pressedkey == 10)
141			if not exitkey and pressedkey > -1:
142			# Redraw display
143			self.flush(servers_list)
144			# Wait 100ms...
145			self.wait()
146
147			return self.active_server
148
149			def flush(self, servers_list):
150			"""Update the servers' list screen.
151
152			servers_list: List of dict with servers stats
153			"""
154			self.erase()
155			self.display(servers_list)
156
157			def display(self, servers_list):
158			"""Display the servers list.
159
160			Return:
161			True if the stats have been displayed
162			False if the stats have not been displayed (no server available)
163			"""
164			# Init the internal line/column for Glances Curses
165			self.init_line_column()
166
167			# Get the current screen size
168			screen_x = self.screen.getmaxyx()[1]
169			screen_y = self.screen.getmaxyx()[0]
170
171			# Init position
172			x = 0
173			y = 0
174
175			# Display top header
176			if len(servers_list) == 0:
177			if self.first_scan and not self.args.disable_autodiscover:
178			msg = 'Glances is scanning your network. Please wait...'
179			self.first_scan = False
180			else:
181			msg = 'No Glances server available'
182			elif len(servers_list) == 1:
183			msg = 'One Glances server available'
184			else:
185			msg = '{0} Glances servers available'.format(len(servers_list))
186			if self.args.disable_autodiscover:
187			msg += ' ' + '(auto discover is disabled)'
188			self.term_window.addnstr(y, x,
189			msg,
190			screen_x - x,
191			self.colors_list['TITLE'])
192
193			if len(servers_list) == 0:
194			return False
195
196			# Display the Glances server list
197			# ================================
198
199			# Table of table
200			# Item description: [stats_id, column name, column size]
201			column_def = [
202			['name', 'Name', 16],
203			['alias', None, None],
204			['load_min5', 'LOAD', 6],
205			['cpu_percent', 'CPU%', 5],
206			['mem_percent', 'MEM%', 5],
207			['status', 'STATUS', 9],
208			['ip', 'IP', 15],
209			# ['port', 'PORT', 5],
210			['hr_name', 'OS', 16],
211			]
212			y = 2
213
214			# Display table header
215			xc = x + 2
216			for cpt, c in enumerate(column_def):
217			if xc < screen_x and y < screen_y and c[1] is not None:
218			self.term_window.addnstr(y, xc,
219			c[1],
220			screen_x - x,
221			self.colors_list['BOLD'])
222			xc += c[2] + self.space_between_column
223			y += 1
224
225			# If a servers has been deleted from the list...
226			# ... and if the cursor is in the latest position
227			if self.cursor > len(servers_list) - 1:
228			# Set the cursor position to the latest item
229			self.cursor = len(servers_list) - 1
230
231			# Display table
232			line = 0
233			for v in servers_list:
234			# Get server stats
235			server_stat = {}
236			for c in column_def:
237			try:
238			server_stat[c[0]] = v[c[0]]
239			except KeyError as e:
240			logger.debug(
241			"Cannot grab stats {0} from server (KeyError: {1})".format(c[0], e))
242			server_stat[c[0]] = '?'
243			# Display alias instead of name
244			try:
245			if c[0] == 'alias' and v[c[0]] is not None:
246			server_stat['name'] = v[c[0]]
247			except KeyError:
248			pass
249
250			# Display line for server stats
251			cpt = 0
252			xc = x
253
254			# Is the line selected ?
255			if line == self.cursor:
256			# Display cursor
257			self.term_window.addnstr(
258			y, xc, ">", screen_x - xc, self.colors_list['BOLD'])
259
260			# Display the line
261			xc += 2
262			for c in column_def:
263			if xc < screen_x and y < screen_y and c[1] is not None:
264			# Display server stats
265			self.term_window.addnstr(
266			y, xc, format(server_stat[c[0]]), c[2], self.colors_list[v['status']])
267			xc += c[2] + self.space_between_column
268			cpt += 1
269			# Next line, next server...
270			y += 1
271			line += 1
272
273			return True
274

nicolargo / glances

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GlancesCursesBrowser.active_server() A

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