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from __future__ import print_function
__metaclass__ = type
import yaml
from collections import defaultdict
from cStringIO import StringIO
from datetime import datetime, timedelta
import httplib
import os
import socket
import subprocess
import sys
import tempfile
from time import sleep
import urllib2
from jujuconfig import get_selected_environment
WIN_JUJU_CMD = os.path.join('\\', 'Progra~2', 'Juju', 'juju.exe')
class ErroredUnit(Exception):
def __init__(self, environment, unit_name, state):
msg = '<%s> %s is in state %s' % (environment, unit_name, state)
Exception.__init__(self, msg)
class until_timeout:
"""Yields None until timeout is reached.
:ivar timeout: Number of seconds to wait.
"""
def __init__(self, timeout):
self.timeout = timeout
self.start = self.now()
def __iter__(self):
return self
@staticmethod
def now():
return datetime.now()
def next(self):
if self.now() - self.start >= timedelta(0, self.timeout):
raise StopIteration
return None
def yaml_loads(yaml_str):
return yaml.safe_load(StringIO(yaml_str))
class CannotConnectEnv(subprocess.CalledProcessError):
def __init__(self, e):
super(CannotConnectEnv, self).__init__(e.returncode, e.cmd, e.output)
class JujuClientDevel:
# This client is meant to work with the latest version of juju.
# Subclasses will retain support for older versions of juju, so that the
# latest version is easy to read, and older versions can be trivially
# deleted.
def __init__(self, version, full_path):
self.version = version
self.full_path = full_path
@classmethod
def get_version(cls):
return subprocess.check_output(('juju', '--version')).strip()
@classmethod
def get_full_path(cls):
if sys.platform == 'win32':
return WIN_JUJU_CMD
return subprocess.check_output(('which', 'juju')).rstrip('\n')
@classmethod
def by_version(cls):
version = cls.get_version()
full_path = cls.get_full_path()
if version.startswith('1.16'):
return JujuClient16(version, full_path)
else:
return JujuClientDevel(version, full_path)
def _full_args(self, environment, command, sudo, args):
# sudo is not needed for devel releases.
e_arg = () if environment is None else ('-e', environment.environment)
return ('juju', '--show-log', command,) + e_arg + args
def bootstrap(self, environment):
"""Bootstrap, using sudo if necessary."""
if environment.hpcloud:
constraints = 'mem=4G'
else:
constraints = 'mem=2G'
self.juju(environment, 'bootstrap', ('--constraints', constraints),
environment.needs_sudo())
def destroy_environment(self, environment):
self.juju(
None, 'destroy-environment',
(environment.environment, '--force', '-y'),
environment.needs_sudo(), check=False)
def get_juju_output(self, environment, command):
args = self._full_args(environment, command, False, ())
with tempfile.TemporaryFile() as stderr:
try:
return subprocess.check_output(args, stderr=stderr)
except subprocess.CalledProcessError as e:
stderr.seek(0)
e.stderr = stderr.read()
if ('Unable to connect to environment' in e.stderr
or 'MissingOrIncorrectVersionHeader' in e.stderr
or '307: Temporary Redirect' in e.stderr):
raise CannotConnectEnv(e)
print('!!! ' + e.stderr)
raise
def get_status(self, environment):
"""Get the current status as a dict."""
return Status(yaml_loads(self.get_juju_output(environment, 'status')))
def juju(self, environment, command, args, sudo=False, check=True):
"""Run a command under juju for the current environment."""
args = self._full_args(environment, command, sudo, args)
print(' '.join(args))
sys.stdout.flush()
if check:
return subprocess.check_call(args)
return subprocess.call(args)
class JujuClient16(JujuClientDevel):
def destroy_environment(self, environment):
self.juju(environment, 'destroy-environment', ('-y',),
environment.needs_sudo(), check=False)
def _full_args(self, environment, command, sudo, args):
# juju 1.16.x required sudo, so replace the juju command with it, as
# appropriate.
full = super(JujuClient16, self)._full_args(
environment, command, sudo, args)
sudo_args = ('sudo', '-E', self.full_path) if sudo else ('juju',)
return sudo_args + full[1:]
class Status:
def __init__(self, status):
self.status = status
def agent_items(self):
for machine_name, machine in sorted(self.status['machines'].items()):
yield machine_name, machine
for service in sorted(self.status['services'].values()):
for unit_name, unit in service.get('units', {}).items():
yield unit_name, unit
def agent_states(self):
"""Map agent states to the units and machines in those states."""
states = defaultdict(list)
for item_name, item in self.agent_items():
states[item.get('agent-state', 'no-agent')].append(item_name)
return states
def check_agents_started(self, environment_name):
"""Check whether all agents are in the 'started' state.
If not, return agent_states output. If so, return None.
If an error is encountered for an agent, raise ErroredUnit
"""
# Look for errors preventing an agent from being installed
for item_name, item in self.agent_items():
state_info = item.get('agent-state-info', '')
if 'error' in state_info:
raise ErroredUnit(environment_name, item_name, state_info)
states = self.agent_states()
if states.keys() == ['started']:
return None
for state, entries in states.items():
if 'error' in state:
raise ErroredUnit(environment_name, entries[0], state)
return states
def get_agent_versions(self):
versions = defaultdict(set)
for item_name, item in self.agent_items():
versions[item.get('agent-version', 'unknown')].add(item_name)
return versions
class Environment:
def __init__(self, environment, client=None, config=None):
self.environment = environment
self.client = client
self.config = config
if self.config is not None:
self.local = bool(self.config.get('type') == 'local')
self.hpcloud = bool(
'hpcloudsvc' in self.config.get('auth-url', ''))
else:
self.local = False
self.hpcloud = False
@classmethod
def from_config(cls, name):
client = JujuClientDevel.by_version()
return cls(name, client, get_selected_environment(name)[0])
def needs_sudo(self):
return self.local
def bootstrap(self):
return self.client.bootstrap(self)
def upgrade_juju(self):
args = ('--version', self.get_matching_agent_version(no_build=True))
if self.local:
args += ('--upload-tools',)
self.client.juju(self, 'upgrade-juju', args)
def destroy_environment(self):
return self.client.destroy_environment(self)
def juju(self, command, *args):
return self.client.juju(self, command, args)
def get_status(self):
return self.client.get_status(self)
def wait_for_started(self):
"""Wait until all unit/machine agents are 'started'."""
for ignored in until_timeout(1200):
try:
status = self.get_status()
except CannotConnectEnv:
print('Supressing "Unable to connect to environment"')
continue
states = status.check_agents_started(self.environment)
if states is None:
break
print(format_listing(states, 'started', self.environment))
sys.stdout.flush()
else:
raise Exception('Timed out waiting for agents to start in %s.' %
self.environment)
return status
def wait_for_version(self, version):
for ignored in until_timeout(300):
try:
versions = self.get_status().get_agent_versions()
except CannotConnectEnv:
print('Supressing "Unable to connect to environment"')
continue
if versions.keys() == [version]:
break
print(format_listing(versions, version, self.environment))
sys.stdout.flush()
else:
raise Exception('Some versions did not update.')
def get_matching_agent_version(self, no_build=False):
version_number = self.client.version.split('-')[0]
if not no_build and self.local:
version_number += '.1'
return version_number
def format_listing(listing, expected, environment):
value_listing = []
for value, entries in listing.items():
if value == expected:
continue
value_listing.append('%s: %s' % (value, ', '.join(entries)))
return ('<%s> ' % environment) + ' | '.join(value_listing)
def check_wordpress(environment, host):
""""Check whether Wordpress has come up successfully.
Times out after 30 seconds.
"""
welcome_text = ('Welcome to the famous five minute WordPress'
' installation process!')
url = 'http://%s/wp-admin/install.php' % host
for ignored in until_timeout(30):
try:
page = urllib2.urlopen(url)
except (urllib2.URLError, httplib.HTTPException, socket.error):
pass
else:
if welcome_text in page.read():
break
# Let's not DOS wordpress
sleep(1)
else:
raise Exception(
'Cannot get welcome screen at %s %s' % (url, environment))
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