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Merge branch 'issue519' into develop

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This commit is contained in:
Nicolargo 2015-08-21 16:18:16 +02:00
commit e60522f2db
4 changed files with 134 additions and 99 deletions
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5
glances/core/glances_logging.py
View File

@ -43,6 +43,9 @@ LOGGING_CFG = {
},
'short': {
'format': '%(levelname)s: %(message)s'
},
'free': {
'format': '%(message)s'
}
},
'handlers': {
@ -56,7 +59,7 @@ LOGGING_CFG = {
'console': {
'level': 'CRITICAL',
'class': 'logging.StreamHandler',
'formatter': 'short'
'formatter': 'free'
}
},
'loggers': {

5
glances/core/glances_stats.py
View File

@ -225,9 +225,12 @@ class GlancesStats(object):
def end(self):
"""End of the Glances stats."""
# Close the export module
# Close export modules
for e in self._exports:
self._exports[e].exit()
# Close plugins
for p in self._plugins:
self._plugins[p].exit()
class GlancesStatsServer(GlancesStats):

219
glances/plugins/glances_docker.py
View File

@ -19,14 +19,16 @@
"""Docker plugin."""
import numbers
import os
import re
import threading
import time
# Import Glances libs
from glances.core.glances_logging import logger
from glances.core.glances_timer import getTimeSinceLastUpdate
from glances.plugins.glances_plugin import GlancesPlugin
from glances.core.glances_timer import Timer
# Docker-py library (optional and Linux-only)
# https://github.com/docker/docker-py
@ -60,6 +62,17 @@ class Plugin(GlancesPlugin):
# Init the Docker API
self.docker_client = False
# Dict of thread (to grab stats asynchroniously, one thread is created by container)
# key: Container Id
# value: instance of ThreadDockerGrabber
self.thread_list = {}
def exit(self):
"""Overwrite the exit method to close threads"""
logger.debug("Stop the Docker plugin")
for t in self.thread_list.values():
t.stop()
def get_key(self):
"""Return the key of the list."""
return 'name'
@ -148,6 +161,8 @@ class Plugin(GlancesPlugin):
if self.input_method == 'local':
# Update stats
# Docker version
# Exemple: {
# "KernelVersion": "3.16.4-tinycore64",
# "Arch": "amd64",
@ -161,7 +176,10 @@ class Plugin(GlancesPlugin):
self.stats['version'] = self.docker_client.version()
except Exception as e:
# Correct issue#649
logger.error("Plugin can not get Docker version ({})".format(e))
logger.error("{} plugin - Can not get Docker version ({})".format(self.plugin_name, e))
return self.stats
# Container globals information
# Example: [{u'Status': u'Up 36 seconds',
# u'Created': 1420378904,
# u'Image': u'nginx:1',
@ -170,42 +188,44 @@ class Plugin(GlancesPlugin):
# u'Command': u"nginx -g 'daemon off;'",
# u'Names': [u'/webstack_nginx_1'],
# u'Id': u'b0da859e84eb4019cf1d965b15e9323006e510352c402d2f442ea632d61faaa5'}]
self.stats['containers'] = self.docker_client.containers()
# Update current containers list
try:
self.stats['containers'] = self.docker_client.containers()
except Exception as e:
logger.error("{} plugin - Can not get containers list ({})".format(self.plugin_name, e))
return self.stats
# Start new thread for new container
for container in self.stats['containers']:
if container['Id'] not in self.thread_list:
# Thread did not exist in the internal dict
# Create it and add it to the internal dict
logger.debug("{} plugin - Create thread for container {}".format(self.plugin_name, container['Id'][:12]))
t = ThreadDockerGrabber(self.docker_client, container['Id'], self.args.time)
self.thread_list[container['Id']] = t
t.start()
# Stop threads for non-existing containers
nonexisting_containers = list(set(self.thread_list.keys()) - set([c['Id'] for c in self.stats['containers']]))
for container_id in nonexisting_containers:
# Stop the thread
logger.debug("{} plugin - Stop thread for old container {}".format(self.plugin_name, container_id[:12]))
self.thread_list[container_id].stop()
# Delete the item from the dict
del(self.thread_list[container_id])
# Get stats for all containers
for c in self.stats['containers']:
if not hasattr(self, 'docker_stats'):
# Create a dict with all the containers' stats instance
self.docker_stats = {}
# TODO: Find a way to correct this
# The following optimization is not compatible with the network stats
# The self.docker_client.stats method should be call every time in order to have network stats refreshed
# Nevertheless, if we call it every time, Glances is slow...
if c['Id'] not in self.docker_stats:
# Create the stats instance for the current container
try:
self.docker_stats[c['Id']] = self.docker_client.stats(c['Id'], decode=True)
logger.debug("Create Docker stats object for container {0}".format(c['Id']))
except Exception as e:
# Correct Issue #602
logger.error("Cannot call Docker stats method {0}".format(e))
# Get the docker stats
try:
# self.docker_stats[c['Id']] = self.docker_client.stats(c['Id'], decode=True)
all_stats = self.docker_stats[c['Id']].next()
except Exception:
all_stats = {}
c['cpu'] = self.get_docker_cpu(c['Id'], all_stats)
c['memory'] = self.get_docker_memory(c['Id'], all_stats)
# c['network'] = self.get_docker_network(c['Id'], all_stats)
for container in self.stats['containers']:
# The key is the container name and not the Id
container['key'] = self.get_key()
# Export name (first name in the list, without the /)
c['name'] = c['Names'][0][1:]
container['name'] = container['Names'][0][1:]
# The key is the container name and not the Id
c['key'] = self.get_key()
container['cpu'] = self.get_docker_cpu(container['Id'], self.thread_list[container['Id']].stats)
container['memory'] = self.get_docker_memory(container['Id'], self.thread_list[container['Id']].stats)
container['network'] = self.get_docker_network(container['Id'], self.thread_list[container['Id']].stats)
elif self.input_method == 'snmp':
# Update stats using SNMP
@ -214,28 +234,6 @@ class Plugin(GlancesPlugin):
return self.stats
def get_docker_cpu_old(self, container_id):
"""Return the container CPU usage by reading /sys/fs/cgroup/.
Input: id is the full container id
Output: a dict {'total': 1.49, 'user': 0.65, 'system': 0.84}
"""
ret = {}
# Read the stats
try:
with open('/sys/fs/cgroup/cpuacct/docker/' + container_id + '/cpuacct.stat', 'r') as f:
for line in f:
m = re.search(r"(system|user)\s+(\d+)", line)
if m:
ret[m.group(1)] = int(m.group(2))
except IOError as e:
logger.error("Can not grab container CPU stat ({0})".format(e))
return ret
if isinstance(ret["system"], numbers.Number) and isinstance(ret["user"], numbers.Number):
ret["total"] = ret["system"] + ret["user"]
# Return the stats
return ret
def get_docker_cpu(self, container_id, all_stats):
"""Return the container CPU usage.
@ -257,13 +255,7 @@ class Plugin(GlancesPlugin):
cpu_new['nb_core'] = len(all_stats['cpu_stats']['cpu_usage']['percpu_usage'])
except KeyError as e:
# all_stats do not have CPU information
logger.debug("Can not grab CPU usage for container {0} ({1}). Trying fallback method.".format(container_id, e))
# Trying fallback to old grab method
ret = self.get_docker_cpu_old(container_id)
# Get the user ticks
ticks = self.get_user_ticks()
for k in ret.keys():
ret[k] = float(ret[k]) / ticks
logger.debug("Can not grab CPU usage for container {0} ({1})".format(container_id, e))
else:
# Previous CPU stats stored in the cpu_old variable
if not hasattr(self, 'cpu_old'):
@ -292,26 +284,6 @@ class Plugin(GlancesPlugin):
# Return the stats
return ret
def get_docker_memory_old(self, container_id):
"""Return the container MEMORY usage by reading /sys/fs/cgroup/.
Input: id is the full container id
Output: a dict {'rss': 1015808, 'cache': 356352}
"""
ret = {}
# Read the stats
try:
with open('/sys/fs/cgroup/memory/docker/' + container_id + '/memory.stat', 'r') as f:
for line in f:
m = re.search(r"(rss|cache)\s+(\d+)", line)
if m:
ret[m.group(1)] = int(m.group(2))
except IOError as e:
logger.error("Can not grab container MEM stat ({0})".format(e))
return ret
# Return the stats
return ret
def get_docker_memory(self, container_id, all_stats):
"""Return the container MEMORY.
@ -328,9 +300,7 @@ class Plugin(GlancesPlugin):
ret['max_usage'] = all_stats['memory_stats']['max_usage']
except KeyError as e:
# all_stats do not have MEM information
logger.debug("Can not grab MEM usage for container {0} ({1}). Trying fallback method.".format(container_id, e))
# Trying fallback to old grab method
ret = self.get_docker_memory_old(container_id)
logger.debug("Can not grab MEM usage for container {0} ({1})".format(container_id, e))
# Return the stats
return ret
@ -417,10 +387,10 @@ class Plugin(GlancesPlugin):
ret.append(self.curse_add_line(msg))
msg = '{0:>7}'.format('MEM')
ret.append(self.curse_add_line(msg))
# msg = '{0:>6}'.format('Rx/s')
# ret.append(self.curse_add_line(msg))
# msg = '{0:>6}'.format('Tx/s')
# ret.append(self.curse_add_line(msg))
msg = '{0:>6}'.format('Rx/s')
ret.append(self.curse_add_line(msg))
msg = '{0:>6}'.format('Tx/s')
ret.append(self.curse_add_line(msg))
msg = ' {0:8}'.format('Command')
ret.append(self.curse_add_line(msg))
# Data
@ -455,13 +425,13 @@ class Plugin(GlancesPlugin):
msg = '{0:>7}'.format('?')
ret.append(self.curse_add_line(msg))
# NET RX/TX
# for r in ['rx', 'tx']:
# try:
# value = self.auto_unit(int(container['network'][r] // container['network']['time_since_update'] * 8)) + "b"
# msg = '{0:>6}'.format(value)
# except KeyError:
# msg = '{0:>6}'.format('?')
# ret.append(self.curse_add_line(msg))
for r in ['rx', 'tx']:
try:
value = self.auto_unit(int(container['network'][r] // container['network']['time_since_update'] * 8)) + "b"
msg = '{0:>6}'.format(value)
except KeyError:
msg = '{0:>6}'.format('?')
ret.append(self.curse_add_line(msg))
# Command
msg = ' {0}'.format(container['Command'])
ret.append(self.curse_add_line(msg))
@ -474,3 +444,58 @@ class Plugin(GlancesPlugin):
return 'CAREFUL'
else:
return 'OK'
class ThreadDockerGrabber(threading.Thread):
"""
Specific thread to grab docker stats.
stats is a dict
"""
def __init__(self, docker_client, container_id, refresh_time=3):
"""Init the class:
docker_client: instance of Docker-py client
container_id: Id of the container"""
logger.debug("docker plugin - Create thread for container {}".format(container_id[:12]))
super(ThreadDockerGrabber, self).__init__()
# Refresh time for sub thread
self._refresh_time = refresh_time
# Event needed to stop properly the thread
self._stop = threading.Event()
# The docker-py return stats as a stream
self._container_id = container_id
self._stats_stream = docker_client.stats(container_id, decode=True)
# The class return the stats as a dict
self._stats = {}
def run(self):
"""Function called to grab stats.
Infinite loop, should be stopped by calling the stop() method"""
for i in self._stats_stream:
self._stats = i
# countdown = Timer(self._refresh_time)
# while not countdown.finished() and not is_stopped:
# is_stopped = self.stopped()
# time.sleep(0.1)
# if is_stopped:
# break
time.sleep(0.1)
if self.stopped():
break
@property
def stats(self):
return self._stats
@stats.setter
def stats(self, value):
self._stats = value
def stop(self, timeout=None):
logger.debug("docker plugin - Close thread for container {}".format(self._container_id[:12]))
self._stop.set()
super(ThreadDockerGrabber, self).join(timeout)
def stopped(self):
return self._stop.isSet()

4
glances/plugins/glances_plugin.py
View File

@ -71,6 +71,10 @@ class GlancesPlugin(object):
# Init the views
self.views = dict()
def exit(self):
"""Method to be called when Glances exit"""
logger.debug("Stop the {} plugin".format(self.plugin_name))
def __repr__(self):
"""Return the raw stats."""
return self.stats