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import logging
import time
import os
from twisted.internet import threads
from landscape.accumulate import Accumulator
from landscape.lib.monitor import CoverageMonitor
from landscape.monitor.plugin import MonitorPlugin
try:
from rados import Rados
has_rados = hasattr(Rados, "get_cluster_stats")
except ImportError:
has_rados = False
class CephUsage(MonitorPlugin):
"""
Plugin that captures Ceph usage information. This only works if the client
runs on one of the Ceph monitor nodes, and noops otherwise.
The plugin requires the 'python-ceph' package to be installed, which is the
case on a standard "ceph" charm deployment.
The landscape-client charm should join a ceph-client relation with the ceph
charm, which will crete a keyring and config file for the landscape-client
to consume in <data_path>/ceph-client/ceph.landscape-client.conf. It
contains the following:
[global]
auth supported = cephx
keyring = <keyring-file>
mon host = <ip>:6789
The configured keyring can be generated with:
ceph-authtool <keyring-file> --create-keyring
--name=client.landscape-client --add-key=<key>
"""
persist_name = "ceph-usage"
scope = "storage"
# Prevent the Plugin base-class from scheduling looping calls.
run_interval = None
def __init__(self, interval=30, monitor_interval=60 * 60,
create_time=time.time):
self.active = True
self._has_rados = has_rados
self._interval = interval
self._monitor_interval = monitor_interval
self._ceph_usage_points = []
self._ceph_ring_id = None
self._create_time = create_time
self._ceph_config = None
def register(self, registry):
super(CephUsage, self).register(registry)
self._ceph_config = os.path.join(
self.registry.config.data_path, "ceph-client",
"ceph.landscape-client.conf")
self._accumulate = Accumulator(self._persist, self._interval)
self._monitor = CoverageMonitor(
self._interval, 0.8, "Ceph usage snapshot",
create_time=self._create_time)
self.registry.reactor.call_every(self._interval, self.run)
self.registry.reactor.call_every(
self._monitor_interval, self._monitor.log)
self.registry.reactor.call_on("stop", self._monitor.log, priority=2000)
self.call_on_accepted("ceph-usage", self.send_message, True)
def create_message(self):
ceph_points = self._ceph_usage_points
ring_id = self._ceph_ring_id
self._ceph_usage_points = []
return {"type": "ceph-usage",
"ring-id": ring_id,
"ceph-usages": [], # For backwards-compatibility
"data-points": ceph_points}
def send_message(self, urgent=False):
message = self.create_message()
if message["ring-id"] and message["data-points"]:
self.registry.broker.send_message(
message, self._session_id, urgent=urgent)
def exchange(self, urgent=False):
self.registry.broker.call_if_accepted(
"ceph-usage", self.send_message, urgent)
def run(self):
if not self._should_run():
return
self._monitor.ping()
deferred = threads.deferToThread(self._perform_rados_call)
deferred.addCallback(self._handle_usage)
return deferred
def _should_run(self):
"""Returns whether or not this plugin should run."""
if not self.active:
return False
if not self._has_rados:
logging.info("This machine does not appear to be a Ceph machine. "
"Deactivating plugin.")
self.active = False
return False
# Check if a ceph config file is available.
# If it is not, it's not a ceph machine or ceph is not set up yet.
if self._ceph_config is None or not os.path.exists(self._ceph_config):
return False
return True
def _perform_rados_call(self):
"""The actual Rados interaction."""
with Rados(conffile=self._ceph_config,
rados_id="landscape-client") as cluster:
cluster_stats = cluster.get_cluster_stats()
if self._ceph_ring_id is None:
fsid = unicode(cluster.get_fsid(), "utf-8")
self._ceph_ring_id = fsid
return cluster_stats
def _handle_usage(self, cluster_stats):
"""A method to use as callback to the rados interaction.
Parses the output and stores the usage data in an accumulator.
"""
names_map = [
("total", "kb"), ("avail", "kb_avail"), ("used", "kb_used")]
timestamp = int(self._create_time())
step_values = []
for name, key in names_map:
value = cluster_stats[key] * 1024 # Report usage in bytes
step_value = self._accumulate(timestamp, value, "usage.%s" % name)
step_values.append(step_value)
if not all(step_values):
return
point = [step_value[0]] # accumulated timestamp
point.extend(int(step_value[1]) for step_value in step_values)
self._ceph_usage_points.append(tuple(point))