231 lines
7.3 KiB
Python
231 lines
7.3 KiB
Python
import logging
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import os
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import uuid
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import threading
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import boto.ec2
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import requests
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import cachetools
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from jinja2 import FileSystemLoader, Environment
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from trollius import coroutine, From, Return, get_event_loop
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from functools import partial
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from buildman.asyncutil import AsyncWrapper
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logger = logging.getLogger(__name__)
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ONE_HOUR = 60*60
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ENV = Environment(loader=FileSystemLoader('buildman/templates'))
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TEMPLATE = ENV.get_template('cloudconfig.yaml')
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class ExecutorException(Exception):
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""" Exception raised when there is a problem starting or stopping a builder.
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"""
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pass
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class BuilderExecutor(object):
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def __init__(self, executor_config, manager_public_ip):
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self.executor_config = executor_config
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self.manager_public_ip = manager_public_ip
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""" Interface which can be plugged into the EphemeralNodeManager to provide a strategy for
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starting and stopping builders.
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"""
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@coroutine
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def start_builder(self, realm, token):
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""" Create a builder with the specified config. Returns a unique id which can be used to manage
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the builder.
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"""
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raise NotImplementedError
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@coroutine
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def stop_builder(self, builder_id):
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""" Stop a builder which is currently running.
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"""
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raise NotImplementedError
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def get_manager_websocket_url(self):
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return 'ws://{0}:'
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def generate_cloud_config(self, realm, token, coreos_channel, manager_ip,
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quay_username=None, quay_password=None, etcd_token=None):
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if quay_username is None:
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quay_username = self.executor_config['QUAY_USERNAME']
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if quay_password is None:
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quay_password = self.executor_config['QUAY_PASSWORD']
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if etcd_token is None:
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etcd_token = self.executor_config['ETCD_DISCOVERY_TOKEN']
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return TEMPLATE.render(
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realm=realm,
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token=token,
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quay_username=quay_username,
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quay_password=quay_password,
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etcd_token=etcd_token,
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manager_ip=manager_ip,
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coreos_channel=coreos_channel,
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)
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class EC2Executor(BuilderExecutor):
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""" Implementation of BuilderExecutor which uses libcloud to start machines on a variety of cloud
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providers.
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"""
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COREOS_STACK_URL = 'http://%s.release.core-os.net/amd64-usr/current/coreos_production_ami_hvm.txt'
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def __init__(self, *args, **kwargs):
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self._loop = get_event_loop()
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super(EC2Executor, self).__init__(*args, **kwargs)
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def _get_conn(self):
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""" Creates an ec2 connection which can be used to manage instances.
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"""
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return AsyncWrapper(boto.ec2.connect_to_region(
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self.executor_config['EC2_REGION'],
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aws_access_key_id=self.executor_config['AWS_ACCESS_KEY'],
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aws_secret_access_key=self.executor_config['AWS_SECRET_KEY'],
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))
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@classmethod
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@cachetools.ttl_cache(ttl=ONE_HOUR)
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def _get_coreos_ami(cls, ec2_region, coreos_channel):
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""" Retrieve the CoreOS AMI id from the canonical listing.
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"""
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stack_list_string = requests.get(EC2Executor.COREOS_STACK_URL % coreos_channel).text
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stack_amis = dict([stack.split('=') for stack in stack_list_string.split('|')])
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return stack_amis[ec2_region]
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@coroutine
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def start_builder(self, realm, token):
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region = self.executor_config['EC2_REGION']
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channel = self.executor_config.get('COREOS_CHANNEL', 'stable')
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get_ami_callable = partial(self._get_coreos_ami, region, channel)
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coreos_ami = yield From(self._loop.run_in_executor(None, get_ami_callable))
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user_data = self.generate_cloud_config(realm, token, channel, self.manager_public_ip)
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logger.debug('Generated cloud config: %s', user_data)
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ec2_conn = self._get_conn()
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ssd_root_ebs = boto.ec2.blockdevicemapping.BlockDeviceType(
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size=8,
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volume_type='gp2',
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delete_on_termination=True,
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)
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block_devices = boto.ec2.blockdevicemapping.BlockDeviceMapping()
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block_devices['/dev/xvda'] = ssd_root_ebs
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reservation = yield From(ec2_conn.run_instances(
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coreos_ami,
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instance_type=self.executor_config['EC2_INSTANCE_TYPE'],
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security_groups=self.executor_config['EC2_SECURITY_GROUP_IDS'],
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key_name=self.executor_config.get('EC2_KEY_NAME', None),
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user_data=user_data,
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instance_initiated_shutdown_behavior='terminate',
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block_device_map=block_devices,
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))
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if not reservation.instances:
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raise ExecutorException('Unable to spawn builder instance.')
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elif len(reservation.instances) != 1:
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raise ExecutorException('EC2 started wrong number of instances!')
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launched = AsyncWrapper(reservation.instances[0])
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yield From(launched.add_tags({
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'Name': 'Quay Ephemeral Builder',
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'Realm': realm,
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'Token': token,
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}))
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raise Return(launched.id)
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@coroutine
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def stop_builder(self, builder_id):
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ec2_conn = self._get_conn()
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stopped_instances = yield From(ec2_conn.stop_instances([builder_id], force=True))
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if builder_id not in [si.id for si in stopped_instances]:
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raise ExecutorException('Unable to stop instance: %s' % builder_id)
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class PopenExecutor(BuilderExecutor):
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""" Implementation of BuilderExecutor which uses Popen to fork a quay-builder process.
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"""
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def __init__(self, executor_config, manager_public_ip):
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self._jobs = {}
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super(PopenExecutor, self).__init__(executor_config, manager_public_ip)
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""" Executor which uses Popen to fork a quay-builder process.
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"""
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@coroutine
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def start_builder(self, realm, token):
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# Now start a machine for this job, adding the machine id to the etcd information
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logger.debug('Forking process for build')
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import subprocess
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builder_env = {
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'TOKEN': token,
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'REALM': realm,
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'ENDPOINT': 'ws://localhost:8787',
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'DOCKER_TLS_VERIFY': os.environ.get('DOCKER_TLS_VERIFY', ''),
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'DOCKER_CERT_PATH': os.environ.get('DOCKER_CERT_PATH', ''),
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'DOCKER_HOST': os.environ.get('DOCKER_HOST', ''),
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}
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logpipe = LogPipe(logging.INFO)
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spawned = subprocess.Popen('/Users/jake/bin/quay-builder', stdout=logpipe, stderr=logpipe,
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env=builder_env)
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builder_id = str(uuid.uuid4())
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self._jobs[builder_id] = (spawned, logpipe)
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logger.debug('Builder spawned with id: %s', builder_id)
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raise Return(builder_id)
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@coroutine
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def stop_builder(self, builder_id):
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if builder_id not in self._jobs:
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raise ExecutorException('Builder id not being tracked by executor.')
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logger.debug('Killing builder with id: %s', builder_id)
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spawned, logpipe = self._jobs[builder_id]
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if spawned.poll() is None:
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spawned.kill()
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logpipe.close()
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class LogPipe(threading.Thread):
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""" Adapted from http://codereview.stackexchange.com/a/17959
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"""
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def __init__(self, level):
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"""Setup the object with a logger and a loglevel
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and start the thread
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"""
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threading.Thread.__init__(self)
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self.daemon = False
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self.level = level
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self.fd_read, self.fd_write = os.pipe()
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self.pipe_reader = os.fdopen(self.fd_read)
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self.start()
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def fileno(self):
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"""Return the write file descriptor of the pipe
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"""
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return self.fd_write
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def run(self):
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"""Run the thread, logging everything.
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"""
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for line in iter(self.pipe_reader.readline, ''):
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logging.log(self.level, line.strip('\n'))
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self.pipe_reader.close()
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def close(self):
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"""Close the write end of the pipe.
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"""
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os.close(self.fd_write)
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