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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
#
"""Docker Extension unit for Glances' Containers plugin."""
import time
from glances.compat import iterkeys, itervalues, nativestr, pretty_date
from glances.logger import logger
from glances.plugins.containers.stats_streamer import StatsStreamer
# Docker-py library (optional and Linux-only)
# https://github.com/docker/docker-py
try:
import requests
import docker
from dateutil import parser, tz
except Exception as e:
import_docker_error_tag = True
# Display debug message if import KeyError
logger.warning("Error loading Docker deps Lib. Docker plugin is disabled ({})".format(e))
else:
import_docker_error_tag = False
class DockerStatsFetcher:
MANDATORY_MEMORY_FIELDS = ["usage", 'limit']
def __init__(self, container):
self._container = container
# Previous computes stats are stored in the self._old_computed_stats variable
# We store time data to enable IoR/s & IoW/s calculations to avoid complexity for consumers of the APIs exposed.
self._old_computed_stats = {}
# Last time when output stats (results) were computed
self._last_stats_computed_time = 0
# Threaded Streamer
stats_iterable = container.stats(decode=True)
self._streamer = StatsStreamer(stats_iterable, initial_stream_value={})
def _log_debug(self, msg, exception=None):
logger.debug("containers (Docker) ID: {} - {} ({}) ".format(self._container.id, msg, exception))
logger.debug(self._streamer.stats)
def stop(self):
self._streamer.stop()
@property
def activity_stats(self):
"""Activity Stats
Each successive access of activity_stats will cause computation of activity_stats
"""
computed_activity_stats = self._compute_activity_stats()
self._old_computed_stats = computed_activity_stats
self._last_stats_computed_time = time.time()
return computed_activity_stats
def _compute_activity_stats(self):
with self._streamer.result_lock:
io_stats = self._get_io_stats()
cpu_stats = self._get_cpu_stats()
memory_stats = self._get_memory_stats()
network_stats = self._get_network_stats()
computed_stats = {
"io": io_stats or {},
"memory": memory_stats or {},
"network": network_stats or {},
"cpu": cpu_stats or {"total": 0.0},
}
return computed_stats
@property
def time_since_update(self):
# In case no update, default to 1
return max(1, self._streamer.last_update_time - self._last_stats_computed_time)
def _get_cpu_stats(self):
"""Return the container CPU usage.
Output: a dict {'total': 1.49}
"""
stats = {'total': 0.0}
try:
cpu_stats = self._streamer.stats['cpu_stats']
precpu_stats = self._streamer.stats['precpu_stats']
cpu = {'system': cpu_stats['system_cpu_usage'], 'total': cpu_stats['cpu_usage']['total_usage']}
precpu = {'system': precpu_stats['system_cpu_usage'], 'total': precpu_stats['cpu_usage']['total_usage']}
# Issue #1857
# If either precpu_stats.online_cpus or cpu_stats.online_cpus is nil
# then for compatibility with older daemons the length of
# the corresponding cpu_usage.percpu_usage array should be used.
cpu['nb_core'] = cpu_stats.get('online_cpus') or len(cpu_stats['cpu_usage']['percpu_usage'] or [])
except KeyError as e:
self._log_debug("Can't grab CPU stats", e)
return None
try:
cpu_delta = cpu['total'] - precpu['total']
system_cpu_delta = cpu['system'] - precpu['system']
# CPU usage % = (cpu_delta / system_cpu_delta) * number_cpus * 100.0
stats['total'] = (cpu_delta / system_cpu_delta) * cpu['nb_core'] * 100.0
except TypeError as e:
self._log_debug("Can't compute CPU usage", e)
return None
# Return the stats
return stats
def _get_memory_stats(self):
"""Return the container MEMORY.
Output: a dict {'rss': 1015808, 'cache': 356352, 'usage': ..., 'max_usage': ...}
"""
memory_stats = self._streamer.stats.get('memory_stats')
# Checks for memory_stats & mandatory fields
if not memory_stats or any(field not in memory_stats for field in self.MANDATORY_MEMORY_FIELDS):
self._log_debug("Missing MEM usage fields")
return None
stats = {field: memory_stats[field] for field in self.MANDATORY_MEMORY_FIELDS}
try:
# Issue #1857 - Some stats are not always available in ['memory_stats']['stats']
detailed_stats = memory_stats['stats']
stats['rss'] = detailed_stats.get('rss') or detailed_stats.get('total_rss')
stats['max_usage'] = detailed_stats.get('max_usage')
stats['cache'] = detailed_stats.get('cache')
except (KeyError, TypeError) as e:
self._log_debug("Can't grab MEM usage", e) # stats do not have MEM information
return None
# Return the stats
return stats
def _get_network_stats(self):
"""Return the container network usage using the Docker API (v1.0 or higher).
Output: a dict {'time_since_update': 3000, 'rx': 10, 'tx': 65}.
with:
time_since_update: number of seconds elapsed between the latest grab
rx: Number of bytes received
tx: Number of bytes transmitted
"""
eth0_stats = self._streamer.stats.get('networks', {}).get('eth0')
# Checks for net_stats & mandatory fields
if not eth0_stats or any(field not in eth0_stats for field in ['rx_bytes', 'tx_bytes']):
self._log_debug("Missing Network usage fields")
return None
# Read the rx/tx stats (in bytes)
stats = {'cumulative_rx': eth0_stats["rx_bytes"], 'cumulative_tx': eth0_stats["tx_bytes"]}
# Using previous stats to calculate rates
old_network_stats = self._old_computed_stats.get("network")
if old_network_stats:
stats['time_since_update'] = round(self.time_since_update)
stats['rx'] = stats['cumulative_rx'] - old_network_stats["cumulative_rx"]
stats['tx'] = stats['cumulative_tx'] - old_network_stats['cumulative_tx']
# Return the stats
return stats
def _get_io_stats(self):
"""Return the container IO usage using the Docker API (v1.0 or higher).
Output: a dict {'time_since_update': 3000, 'ior': 10, 'iow': 65}.
with:
time_since_update: number of seconds elapsed between the latest grab
ior: Number of bytes read
iow: Number of bytes written
"""
io_service_bytes_recursive = self._streamer.stats.get('blkio_stats', {}).get('io_service_bytes_recursive')
# Checks for net_stats
if not io_service_bytes_recursive:
self._log_debug("Missing blockIO usage fields")
return None
# Read the ior/iow stats (in bytes)
try:
# Read IOR and IOW value in the structure list of dict
cumulative_ior = [i for i in io_service_bytes_recursive if i['op'].lower() == 'read'][0]['value']
cumulative_iow = [i for i in io_service_bytes_recursive if i['op'].lower() == 'write'][0]['value']
except (TypeError, IndexError, KeyError, AttributeError) as e:
self._log_debug("Can't grab blockIO usage", e) # stats do not have io information
return None
stats = {'cumulative_ior': cumulative_ior, 'cumulative_iow': cumulative_iow}
# Using previous stats to calculate difference
old_io_stats = self._old_computed_stats.get("io")
if old_io_stats:
stats['time_since_update'] = round(self.time_since_update)
stats['ior'] = stats['cumulative_ior'] - old_io_stats["cumulative_ior"]
stats['iow'] = stats['cumulative_iow'] - old_io_stats["cumulative_iow"]
# Return the stats
return stats
class DockerContainersExtension:
"""Glances' Containers Plugin's Docker Extension unit"""
CONTAINER_ACTIVE_STATUS = ['running', 'paused']
def __init__(self):
if import_docker_error_tag:
raise Exception("Missing libs required to run Docker Extension (Containers) ")
self.client = None
self.ext_name = "containers (Docker)"
self.stats_fetchers = {}
self.connect()
def connect(self):
"""Connect to the Docker server."""
# Init the Docker API Client
try:
# Do not use the timeout option (see issue #1878)
self.client = docker.from_env()
except Exception as e:
logger.error("{} plugin - Can't connect to Docker ({})".format(self.ext_name, e))
self.client = None
def update_version(self):
# Long and not useful anymore because the information is no more displayed in UIs
# return self.client.version()
return {}
def stop(self):
# Stop all streaming threads
for t in itervalues(self.stats_fetchers):
t.stop()
def update(self, all_tag):
"""Update Docker stats using the input method."""
if not self.client:
return {}, []
version_stats = self.update_version()
# Update current containers list
try:
# Issue #1152: Docker module doesn't export details about stopped containers
# The Containers/all key of the configuration file should be set to True
containers = self.client.containers.list(all=all_tag)
except Exception as e:
logger.error("{} plugin - Can't get containers list ({})".format(self.ext_name, e))
return version_stats, []
# Start new thread for new container
for container in containers:
if container.id not in self.stats_fetchers:
# StatsFetcher did not exist in the internal dict
# Create it, add it to the internal dict
logger.debug("{} plugin - Create thread for container {}".format(self.ext_name, container.id[:12]))
self.stats_fetchers[container.id] = DockerStatsFetcher(container)
# Stop threads for non-existing containers
absent_containers = set(iterkeys(self.stats_fetchers)) - set(c.id for c in containers)
for container_id in absent_containers:
# Stop the StatsFetcher
logger.debug("{} plugin - Stop thread for old container {}".format(self.ext_name, container_id[:12]))
self.stats_fetchers[container_id].stop()
# Delete the StatsFetcher from the dict
del self.stats_fetchers[container_id]
# Get stats for all containers
container_stats = [self.generate_stats(container) for container in containers]
return version_stats, container_stats
@property
def key(self):
"""Return the key of the list."""
return 'name'
def generate_stats(self, container):
# Init the stats for the current container
stats = {
'key': self.key,
# Export name
'name': nativestr(container.name),
# Container Id
'Id': container.id,
# Container Status (from attrs)
'Status': container.attrs['State']['Status'],
'Created': container.attrs['Created'],
'Command': [],
}
# Container Image
try:
# API fails on Unraid - See issue 2233
stats['Image'] = container.image.tags
except requests.exceptions.HTTPError:
stats['Image'] = '-'
if container.attrs['Config'].get('Entrypoint', None):
stats['Command'].extend(container.attrs['Config'].get('Entrypoint', []))
if container.attrs['Config'].get('Cmd', None):
stats['Command'].extend(container.attrs['Config'].get('Cmd', []))
if not stats['Command']:
stats['Command'] = None
if stats['Status'] in self.CONTAINER_ACTIVE_STATUS:
started_at = container.attrs['State']['StartedAt']
stats_fetcher = self.stats_fetchers[container.id]
activity_stats = stats_fetcher.activity_stats
stats.update(activity_stats)
# Additional fields
stats['cpu_percent'] = stats["cpu"]['total']
stats['memory_usage'] = stats["memory"].get('usage')
if stats['memory'].get('cache') is not None:
stats['memory_usage'] -= stats['memory']['cache']
stats['io_r'] = stats['io'].get('ior')
stats['io_w'] = stats['io'].get('iow')
stats['network_rx'] = stats['network'].get('rx')
stats['network_tx'] = stats['network'].get('tx')
stats['Uptime'] = pretty_date(parser.parse(started_at).astimezone(tz.tzlocal()).replace(tzinfo=None))
else:
stats['io'] = {}
stats['cpu'] = {}
stats['memory'] = {}
stats['network'] = {}
stats['io_r'] = None
stats['io_w'] = None
stats['cpu_percent'] = None
stats['memory_percent'] = None
stats['network_rx'] = None
stats['network_tx'] = None
stats['Uptime'] = None
return stats