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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.lib.network import get_active_device_info
from landscape.monitor.plugin import MonitorPlugin
try:
from swift.common.ring import Ring
from swift.cli.recon import Scout
has_swift = True
except ImportError:
has_swift = False
class SwiftUsage(MonitorPlugin):
"""Plugin reporting Swift cluster usage.
This only works if the client runs on a Swift node. It requires the
'python-swift' package to be installed (which is installed on swift nodes).
"""
persist_name = "swift-usage"
scope = "storage"
def __init__(self, interval=30, monitor_interval=60 * 60,
create_time=time.time,
swift_ring="/etc/swift/object.ring.gz"):
self._interval = interval
self._monitor_interval = monitor_interval
self._create_time = create_time
self._swift_ring = swift_ring # To discover Recon host/port
self._has_swift = has_swift
self._swift_usage_points = []
self.active = True
def register(self, registry):
super(SwiftUsage, self).register(registry)
self._accumulate = Accumulator(self._persist, self._interval)
self._monitor = CoverageMonitor(
self.run_interval, 0.8, "Swift device usage snapshot",
create_time=self._create_time)
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("swift-usage", self.send_message, True)
def create_message(self):
usage_points = self._swift_usage_points
self._swift_usage_points = []
if usage_points:
return {"type": "swift-usage", "data-points": usage_points}
def send_message(self, urgent=False):
message = self.create_message()
if message:
self.registry.broker.send_message(
message, self._session_id, urgent=urgent)
def exchange(self, urgent=False):
self.registry.broker.call_if_accepted(
"swift-usage", self.send_message, urgent)
def run(self):
if not self._should_run():
return
self._monitor.ping()
host = self._get_recon_host()
deferred = threads.deferToThread(self._perform_recon_call, host)
deferred.addCallback(self._handle_usage)
return deferred
def _should_run(self):
"""Return whether the plugin should run."""
if not self.active:
return False
if not self._has_swift:
logging.info(
"This machine does not appear to be a Swift machine. "
"Deactivating plugin.")
self.active = False
return False
# Check for object ring config file.
# If it is not present, it's not a Swift machine or it not yet set up.
if not os.path.exists(self._swift_ring):
return False
return True
def _get_recon_host(self):
"""Return a tuple with Recon (host, port)."""
local_ips = self._get_local_ips()
ring = Ring(self._swift_ring)
for dev in ring.devs:
if dev and dev["ip"] in local_ips:
return dev["ip"], dev["port"]
def _get_local_ips(self):
"""Return a list of IP addresses for local devices."""
return [
device["ip_address"] for device in get_active_device_info()]
def _perform_recon_call(self, host):
"""Get usage information from Swift Recon service."""
if not host:
return
scout = Scout("diskusage")
# Perform the actual call
_, disk_usage, code = scout.scout(host)
if code == 200:
return disk_usage
def _handle_usage(self, disk_usage):
timestamp = int(self._create_time())
devices = set()
for usage in disk_usage:
if not usage["mounted"]:
continue
device = usage["device"]
devices.add(device)
step_values = []
for key in ("size", "avail", "used"):
# Store values in tree so it's easy to delete all values for a
# device
persist_key = "usage.%s.%s" % (device, key)
step_value = self._accumulate(
timestamp, usage[key], persist_key)
step_values.append(step_value)
if all(step_values):
point = [step_value[0], device] # accumulated timestamp
point.extend(int(step_value[1]) for step_value in step_values)
self._swift_usage_points.append(tuple(point))
# Update device list and remove usage for devices that no longer exist.
current_devices = set(self._persist.get("devices", ()))
for device in current_devices - devices:
self._persist.remove("usage.%s" % device)
self._persist.set("devices", list(devices))