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# -*- coding: utf-8 -*-
#
# This file is part of Glances.
#
# Copyright (C) 2021 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/>.
#
"""Init the Glances software."""
# Import system libs
import locale
import platform
import signal
import sys
# Global name
# Version should start and end with a numerical char
# See https://packaging.python.org/specifications/core-metadata/#version
__version__ = '3.2.6.1'
__author__ = 'Nicolas Hennion <nicolas@nicolargo.com>'
__license__ = 'LGPLv3'
# Import psutil
try:
from psutil import __version__ as psutil_version
except ImportError:
print('psutil library not found. Glances cannot start.')
sys.exit(1)
# Import Glances libs
# Note: others Glances libs will be imported optionally
from glances.compat import PY3
from glances.logger import logger
from glances.main import GlancesMain
from glances.timer import Counter
# Check locale
try:
locale.setlocale(locale.LC_ALL, '')
except locale.Error:
print("Warning: Unable to set locale. Expect encoding problems.")
# Check Python version
if sys.version_info < (2, 7) or (3, 0) <= sys.version_info < (3, 4):
print('Glances requires at least Python 2.7 or 3.4 to run.')
sys.exit(1)
# Check psutil version
psutil_min_version = (5, 3, 0)
psutil_version_info = tuple([int(num) for num in psutil_version.split('.')])
if psutil_version_info < psutil_min_version:
print('psutil 5.3.0 or higher is needed. Glances cannot start.')
sys.exit(1)
# Trac malloc is only available on Python 3.4 or higher
if PY3:
import tracemalloc
def __signal_handler(signal, frame):
"""Callback for CTRL-C."""
end()
def end():
"""Stop Glances."""
try:
mode.end()
except NameError:
# NameError: name 'mode' is not defined in case of interrupt shortly...
# ...after starting the server mode (issue #1175)
pass
logger.info("Glances stopped (key pressed: CTRL-C)")
# The end...
sys.exit(0)
def start(config, args):
"""Start Glances."""
# Load mode
global mode
if args.trace_malloc or args.memory_leak:
tracemalloc.start()
start_duration = Counter()
if core.is_standalone():
from glances.standalone import GlancesStandalone as GlancesMode
elif core.is_client():
if core.is_client_browser():
from glances.client_browser import GlancesClientBrowser as GlancesMode
else:
from glances.client import GlancesClient as GlancesMode
elif core.is_server():
from glances.server import GlancesServer as GlancesMode
elif core.is_webserver():
from glances.webserver import GlancesWebServer as GlancesMode
# Init the mode
logger.info("Start {} mode".format(GlancesMode.__name__))
mode = GlancesMode(config=config, args=args)
# Start the main loop
logger.debug("Glances started in {} seconds".format(start_duration.get()))
if args.stop_after:
logger.info('Glances will be stopped in ~{} seconds'.format(args.stop_after * args.time * args.memory_leak * 2))
if args.memory_leak:
print(
'Memory leak detection, please wait ~{} seconds...'.format(
args.stop_after * args.time * args.memory_leak * 2
)
)
# First run without dump to fill the memory
mode.serve_n(args.stop_after)
# Then start the memory-leak loop
snapshot_begin = tracemalloc.take_snapshot()
if args.stdout_issue or args.stdout_apidoc:
# Serve once for issue/test mode
mode.serve_issue()
else:
# Serve forever
mode.serve_forever()
if args.memory_leak:
snapshot_end = tracemalloc.take_snapshot()
snapshot_diff = snapshot_end.compare_to(snapshot_begin, 'filename')
memory_leak = sum([s.size_diff for s in snapshot_diff])
print("Memory comsumption: {0:.1f}KB (see log for details)".format(memory_leak / 1000))
logger.info("Memory consumption (top 5):")
for stat in snapshot_diff[:5]:
logger.info(stat)
elif args.trace_malloc:
# See more options here: https://docs.python.org/3/library/tracemalloc.html
snapshot = tracemalloc.take_snapshot()
top_stats = snapshot.statistics("filename")
print("[ Trace malloc - Top 10 ]")
for stat in top_stats[:10]:
print(stat)
# Shutdown
mode.end()
def main():
"""Main entry point for Glances.
Select the mode (standalone, client or server)
Run it...
"""
# Catch the CTRL-C signal
signal.signal(signal.SIGINT, __signal_handler)
# Log Glances and psutil version
logger.info('Start Glances {}'.format(__version__))
logger.info(
'{} {} ({}) and psutil {} detected'.format(
platform.python_implementation(), platform.python_version(), sys.executable, psutil_version
)
)
# Share global var
global core
# Create the Glances main instance
# Glances options from the command line are read first (in __init__)
# then the options from the config file (in parse_args)
core = GlancesMain()
# Glances can be ran in standalone, client or server mode
start(config=core.get_config(), args=core.get_args())
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