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# -*- coding: utf-8 -*-
#
# This file is part of Glances.
#
# SPDX-FileCopyrightText: 2022 Nicolas Hennion <nicolas@nicolargo.com>
#
# SPDX-License-Identifier: LGPL-3.0-only
#
"""Manage the Glances standalone session."""
import asyncio
import sys
import time
from glances.globals import WINDOWS
from glances.logger import logger
from glances.processes import glances_processes
from glances.stats import GlancesStats
from glances.outputs.glances_curses import GlancesCursesStandalone
from glances.outputs.glances_stdout import GlancesStdout
from glances.outputs.glances_stdout_json import GlancesStdoutJson
from glances.outputs.glances_stdout_csv import GlancesStdoutCsv
from glances.outputs.glances_stdout_issue import GlancesStdoutIssue
from glances.outputs.glances_stdout_apidoc import GlancesStdoutApiDoc
from glances.outdated import Outdated
from glances.timer import Counter
class GlancesStandalone(object):
"""This class creates and manages the Glances standalone session."""
def __init__(self, config=None, args=None):
self.config = config
self.args = args
# Quiet mode
self._quiet = args.quiet
self.refresh_time = args.time
# Init stats
start_duration = Counter()
start_duration.reset()
self.stats = GlancesStats(config=config, args=args)
logger.debug("Plugins initialisation duration: {} seconds".format(start_duration.get()))
# Modules (plugins and exporters) are loaded at this point
# Glances can display the list if asked...
if args.modules_list:
self.display_modules_list()
sys.exit(0)
# The args is needed to get the selected process in the process list (Curses mode)
glances_processes.set_args(args)
# If process extended stats is disabled by user
if not args.enable_process_extended:
logger.debug("Extended stats for top process are disabled")
glances_processes.disable_extended()
else:
logger.debug("Extended stats for top process are enabled")
glances_processes.enable_extended()
# Manage optional process filter
if args.process_filter is not None:
glances_processes.process_filter = args.process_filter
if (not WINDOWS) and args.no_kernel_threads:
# Ignore kernel threads in process list
glances_processes.disable_kernel_threads()
# Initial system information update
start_duration.reset()
self.stats.update()
logger.debug("First stats update duration: {} seconds".format(start_duration.get()))
if self.quiet:
logger.info("Quiet mode is ON, nothing will be displayed")
# In quiet mode, nothing is displayed
glances_processes.max_processes = 0
elif args.stdout_issue:
logger.info("Issue mode is ON")
# Init screen
self.screen = GlancesStdoutIssue(config=config, args=args)
elif args.stdout_apidoc:
logger.info("Fields descriptions mode is ON")
# Init screen
self.screen = GlancesStdoutApiDoc(config=config, args=args)
elif args.stdout:
logger.info("Stdout mode is ON, following stats will be displayed: {}".format(args.stdout))
# Init screen
self.screen = GlancesStdout(config=config, args=args)
elif args.stdout_json:
logger.info("Stdout JSON mode is ON, following stats will be displayed: {}".format(args.stdout_json))
# Init screen
self.screen = GlancesStdoutJson(config=config, args=args)
elif args.stdout_csv:
logger.info("Stdout CSV mode is ON, following stats will be displayed: {}".format(args.stdout_csv))
# Init screen
self.screen = GlancesStdoutCsv(config=config, args=args)
else:
# Default number of processes to displayed is set to 50
glances_processes.max_processes = 50
# Init screen
self.screen = GlancesCursesStandalone(config=config, args=args)
# Check the latest Glances version
self.outdated = Outdated(config=config, args=args)
@property
def quiet(self):
return self._quiet
def display_modules_list(self):
"""Display modules list"""
print("Plugins list: {}".format(', '.join(sorted(self.stats.getPluginsList(enable=False)))))
print("Exporters list: {}".format(', '.join(sorted(self.stats.getExportsList(enable=False)))))
def serve_issue(self):
"""Special mode for the --issue option
Update is done in the screen.update function
"""
ret = not self.screen.update(self.stats)
self.end()
return ret
def __serve_once(self):
"""Main loop for the CLI.
:return: True if we should continue (no exit key has been pressed)
"""
# Update stats
# Start a counter used to compute the time needed
counter = Counter()
self.stats.update()
logger.debug('Stats updated duration: {} seconds'.format(counter.get()))
# Export stats
# Start a counter used to compute the time needed
counter_export = Counter()
self.stats.export(self.stats)
logger.debug('Stats exported duration: {} seconds'.format(counter_export.get()))
# Patch for issue1326 to avoid < 0 refresh
adapted_refresh = self.refresh_time - counter.get()
adapted_refresh = adapted_refresh if adapted_refresh > 0 else 0
# Display stats
# and wait refresh_time - counter
if not self.quiet:
# The update function return True if an exit key 'q' or 'ESC'
# has been pressed.
ret = not self.screen.update(self.stats, duration=adapted_refresh)
else:
# Nothing is displayed
# Break should be done via a signal (CTRL-C)
time.sleep(adapted_refresh)
ret = True
return ret
def serve_n(self, n=1):
"""Serve n time."""
for _ in range(n):
if not self.__serve_once():
break
# self.end()
def serve_forever(self):
"""Wrapper to the serve_forever function."""
if self.args.stop_after:
self.serve_n(self.args.stop_after)
else:
while self.__serve_once():
pass
# self.end()
def end(self):
"""End of the standalone CLI."""
if not self.quiet:
self.screen.end()
# Exit from export modules
self.stats.end()
# Check Glances version versus PyPI one
if self.outdated.is_outdated():
print(
"You are using Glances version {}, however version {} is available.".format(
self.outdated.installed_version(), self.outdated.latest_version()
)
)
print("You should consider upgrading using: pip install --upgrade glances")
print("Disable this warning temporarily using: glances --disable-check-update")
print(
"To disable it permanently, refer config reference at "
"https://glances.readthedocs.io/en/latest/config.html#syntax"
)
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