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# This file is part of Glances. |
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# |
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# SPDX-FileCopyrightText: 2024 Nicolas Hennion <[email protected]> |
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# |
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# SPDX-License-Identifier: LGPL-3.0-only |
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# |
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# |
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"""Init the Glances software.""" |
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# Import system libs |
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import locale |
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import platform |
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import signal |
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import sys |
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import tracemalloc |
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# Global name |
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# Version should start and end with a numerical char |
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# See https://packaging.python.org/specifications/core-metadata/#version |
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__version__ = "4.3.2_dev01" |
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__apiversion__ = '4' |
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__author__ = 'Nicolas Hennion <[email protected]>' |
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__license__ = 'LGPLv3' |
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# Import psutil |
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try: |
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from psutil import __version__ as psutil_version |
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except ImportError: |
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print('psutil library not found. Glances cannot start.') |
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sys.exit(1) |
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# Import Glances libs |
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# Note: others Glances libs will be imported optionally |
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from glances.logger import logger |
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from glances.main import GlancesMain |
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from glances.timer import Counter |
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# Check locale |
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try: |
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locale.setlocale(locale.LC_ALL, '') |
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except locale.Error: |
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print("Warning: Unable to set locale. Expect encoding problems.") |
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# Check psutil version |
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psutil_min_version = (5, 3, 0) |
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psutil_version_info = tuple([int(num) for num in psutil_version.split('.')]) |
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if psutil_version_info < psutil_min_version: |
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print('psutil 5.3.0 or higher is needed. Glances cannot start.') |
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sys.exit(1) |
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# Trac malloc is only available on Python 3.4 or higher |
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def __signal_handler(signal, frame): |
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logger.debug(f"Signal {signal} caught") |
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end() |
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def end(): |
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"""Stop Glances.""" |
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try: |
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mode.end() |
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except (NameError, KeyError): |
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# NameError: name 'mode' is not defined in case of interrupt shortly... |
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# ...after starting the server mode (issue #1175) |
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pass |
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logger.info("Glances stopped gracefully") |
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# The end... |
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sys.exit(0) |
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def start_main_loop(args, start_duration): |
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logger.debug(f"Glances started in {start_duration.get()} seconds") |
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if args.stop_after: |
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logger.info(f'Glances will be stopped in ~{args.stop_after * args.time} seconds') |
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def check_memleak(args, mode): |
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if args.memory_leak: |
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wait = args.stop_after * args.time * args.memory_leak * 2 |
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print(f'Memory leak detection, please wait ~{wait} seconds...') |
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# First run without dump to fill the memory |
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mode.serve_n(args.stop_after) |
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# Then start the memory-leak loop |
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snapshot_begin = tracemalloc.take_snapshot() |
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else: |
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snapshot_begin = None |
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return snapshot_begin |
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def setup_server_mode(args, mode): |
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if args.stdout_issue or args.stdout_apidoc: |
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# Serve once for issue/test mode |
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mode.serve_issue() |
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else: |
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# Serve forever |
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mode.serve_forever() |
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def maybe_trace_memleak(args, snapshot_begin): |
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if args.memory_leak: |
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snapshot_end = tracemalloc.take_snapshot() |
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snapshot_diff = snapshot_end.compare_to(snapshot_begin, 'filename') |
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memory_leak = sum([s.size_diff for s in snapshot_diff]) |
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print(f"Memory consumption: {memory_leak / 1000:.1f}KB (see log for details)") |
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logger.info("Memory consumption (top 5):") |
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for stat in snapshot_diff[:5]: |
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logger.info(stat) |
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elif args.trace_malloc: |
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# See more options here: https://docs.python.org/3/library/tracemalloc.html |
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snapshot = tracemalloc.take_snapshot() |
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top_stats = snapshot.statistics("filename") |
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print("[ Trace malloc - Top 10 ]") |
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for stat in top_stats[:10]: |
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print(stat) |
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def start(config, args): |
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"""Start Glances.""" |
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# Load mode |
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global mode |
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if args.trace_malloc or args.memory_leak: |
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tracemalloc.start() |
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start_duration = Counter() |
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if core.is_standalone(): |
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from glances.standalone import GlancesStandalone as GlancesMode |
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elif core.is_client(): |
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if core.is_client_browser(): |
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from glances.client_browser import GlancesClientBrowser as GlancesMode |
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else: |
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from glances.client import GlancesClient as GlancesMode |
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elif core.is_server(): |
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from glances.server import GlancesServer as GlancesMode |
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elif core.is_webserver(): |
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from glances.webserver import GlancesWebServer as GlancesMode |
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# Init the mode |
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logger.info(f"Start {GlancesMode.__name__} mode") |
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mode = GlancesMode(config=config, args=args) |
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start_main_loop(args, start_duration) |
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snapshot_begin = check_memleak(args, mode) |
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setup_server_mode(args, mode) |
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maybe_trace_memleak(args, snapshot_begin) |
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# Shutdown |
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mode.end() |
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def main(): |
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"""Main entry point for Glances. |
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Select the mode (standalone, client or server) |
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Run it... |
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""" |
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# SIGHUP not available on Windows (see issue #2408) |
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if sys.platform.startswith('win'): |
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signal_list = (signal.SIGTERM, signal.SIGINT) |
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else: |
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signal_list = (signal.SIGTERM, signal.SIGINT, signal.SIGHUP) |
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# Catch the kill signal |
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for sig in signal_list: |
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signal.signal(sig, __signal_handler) |
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# Log Glances and psutil version |
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logger.info(f'Start Glances {__version__}') |
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python_impl = platform.python_implementation() |
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python_ver = platform.python_version() |
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logger.info(f'{python_impl} {python_ver} ({sys.executable}) and psutil {psutil_version} detected') |
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# Share global var |
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global core |
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# Create the Glances main instance |
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# Glances options from the command line are read first (in __init__) |
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# then the options from the config file (in parse_args) |
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core = GlancesMain() |
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# Glances can be ran in standalone, client or server mode |
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start(config=core.get_config(), args=core.get_args()) |
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nicolargo /
glances
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