class AbstractBuildSlave(config.ReconfigurableServiceMixin, pb.Avatar,
service.MultiService):
"""This is the master-side representative for a remote buildbot slave.
There is exactly one for each slave described in the config file (the
c['slaves'] list). When buildbots connect in (.attach), they get a
reference to this instance. The BotMaster object is stashed as the
.botmaster attribute. The BotMaster is also our '.parent' Service.
I represent a build slave -- a remote machine capable of
running builds. I am instantiated by the configuration file, and can be
subclassed to add extra functionality."""
implements(IBuildSlave)
keepalive_timer = None
keepalive_interval = None
# reconfig slaves after builders
reconfig_priority = 64
def __init__(self,
name,
password,
max_builds=None,
notify_on_missing=[],
missing_timeout=3600,
properties={},
locks=None,
keepalive_interval=3600):
"""
@param name: botname this machine will supply when it connects
@param password: password this machine will supply when
it connects
@param max_builds: maximum number of simultaneous builds that will
be run concurrently on this buildslave (the
default is None for no limit)
@param properties: properties that will be applied to builds run on
this slave
@type properties: dictionary
@param locks: A list of locks that must be acquired before this slave
can be used
@type locks: dictionary
"""
service.MultiService.__init__(self)
self.slavename = name
self.password = password
# PB registration
self.registration = None
self.registered_port = None
# these are set when the service is started, and unset when it is
# stopped
self.botmaster = None
self.master = None
self.slave_status = SlaveStatus(name)
self.slave = None # a RemoteReference to the Bot, when connected
self.slave_commands = None
self.slavebuilders = {}
self.max_builds = max_builds
self.access = []
if locks:
self.access = locks
self.lock_subscriptions = []
self.properties = Properties()
self.properties.update(properties, "BuildSlave")
self.properties.setProperty("slavename", name, "BuildSlave")
self.lastMessageReceived = 0
if isinstance(notify_on_missing, str):
notify_on_missing = [notify_on_missing]
self.notify_on_missing = notify_on_missing
for i in notify_on_missing:
if not isinstance(i, str):
config.error('notify_on_missing arg %r is not a string' %
(i, ))
self.missing_timeout = missing_timeout
self.missing_timer = None
self.keepalive_interval = keepalive_interval
self.detached_subs = None
self._old_builder_list = None
def __repr__(self):
return "<%s %r>" % (self.__class__.__name__, self.slavename)
def updateLocks(self):
"""Convert the L{LockAccess} objects in C{self.locks} into real lock
objects, while also maintaining the subscriptions to lock releases."""
# unsubscribe from any old locks
for s in self.lock_subscriptions:
s.unsubscribe()
# convert locks into their real form
locks = [(self.botmaster.getLockFromLockAccess(a), a)
for a in self.access]
self.locks = [(l.getLock(self), la) for l, la in locks]
self.lock_subscriptions = [
l.subscribeToReleases(self._lockReleased) for l, la in self.locks
]
def locksAvailable(self):
"""
I am called to see if all the locks I depend on are available,
in which I return True, otherwise I return False
"""
if not self.locks:
return True
for lock, access in self.locks:
if not lock.isAvailable(self, access):
return False
return True
def acquireLocks(self):
"""
I am called when a build is preparing to run. I try to claim all
the locks that are needed for a build to happen. If I can't, then
my caller should give up the build and try to get another slave
to look at it.
"""
log.msg("acquireLocks(slave %s, locks %s)" % (self, self.locks))
if not self.locksAvailable():
log.msg("slave %s can't lock, giving up" % (self, ))
return False
# all locks are available, claim them all
for lock, access in self.locks:
lock.claim(self, access)
return True
def releaseLocks(self):
"""
I am called to release any locks after a build has finished
"""
log.msg("releaseLocks(%s): %s" % (self, self.locks))
for lock, access in self.locks:
lock.release(self, access)
def _lockReleased(self):
"""One of the locks for this slave was released; try scheduling
builds."""
if not self.botmaster:
return # oh well..
self.botmaster.maybeStartBuildsForSlave(self.slavename)
def _saveSlaveInfoDict(self, slaveinfo):
return self.master.db.buildslaves.updateBuildslave(
name=self.slavename,
slaveinfo=slaveinfo,
)
def _getSlaveInfo(self):
d = self.master.db.buildslaves.getBuildslaveByName(self.slavename)
@d.addCallback
def applyInfo(buildslave):
if buildslave is None:
return
self.updateSlaveInfo(**buildslave['slaveinfo'])
return d
def updateSlaveInfo(self, **kwargs):
self.slave_status.updateInfo(**kwargs)
def getSlaveInfo(self, key, default=None):
return self.slave_status.getInfo(key, default)
def setServiceParent(self, parent):
# botmaster needs to set before setServiceParent which calls startService
self.botmaster = parent
self.master = parent.master
service.MultiService.setServiceParent(self, parent)
def startService(self):
self.updateLocks()
self.startMissingTimer()
self.slave_status.addInfoWatcher(self._saveSlaveInfoDict)
d = self._getSlaveInfo()
d.addCallback(lambda _: service.MultiService.startService(self))
return d
@defer.inlineCallbacks
def reconfigService(self, new_config):
# Given a new BuildSlave, configure this one identically. Because
# BuildSlave objects are remotely referenced, we can't replace them
# without disconnecting the slave, yet there's no reason to do that.
new = self.findNewSlaveInstance(new_config)
assert self.slavename == new.slavename
# do we need to re-register?
if (not self.registration or self.password != new.password
or new_config.protocols['pb']['port'] != self.registered_port):
if self.registration:
yield self.registration.unregister()
self.registration = None
self.password = new.password
self.registered_port = new_config.protocols['pb']['port']
self.registration = self.master.pbmanager.register(
self.registered_port, self.slavename, self.password,
self.getPerspective)
# adopt new instance's configuration parameters
self.max_builds = new.max_builds
self.access = new.access
self.notify_on_missing = new.notify_on_missing
self.keepalive_interval = new.keepalive_interval
if self.missing_timeout != new.missing_timeout:
running_missing_timer = self.missing_timer
self.stopMissingTimer()
self.missing_timeout = new.missing_timeout
if running_missing_timer:
self.startMissingTimer()
properties = Properties()
properties.updateFromProperties(new.properties)
self.properties = properties
self.updateLocks()
# update the attached slave's notion of which builders are attached.
# This assumes that the relevant builders have already been configured,
# which is why the reconfig_priority is set low in this class.
yield self.updateSlave()
yield config.ReconfigurableServiceMixin.reconfigService(
self, new_config)
def stopService(self):
self.slave_status.removeInfoWatcher(self._saveSlaveInfoDict)
if self.registration:
self.registration.unregister()
self.registration = None
self.stopMissingTimer()
return service.MultiService.stopService(self)
def findNewSlaveInstance(self, new_config):
# TODO: called multiple times per reconfig; use 1-element cache?
for sl in new_config.slaves:
if sl.slavename == self.slavename:
return sl
assert 0, "no new slave named '%s'" % self.slavename
def startMissingTimer(self):
if self.notify_on_missing and self.missing_timeout and self.parent:
self.stopMissingTimer() # in case it's already running
self.missing_timer = reactor.callLater(self.missing_timeout,
self._missing_timer_fired)
def stopMissingTimer(self):
if self.missing_timer:
self.missing_timer.cancel()
self.missing_timer = None
def getPerspective(self, mind, slavename):
assert slavename == self.slavename
metrics.MetricCountEvent.log("attached_slaves", 1)
# record when this connection attempt occurred
if self.slave_status:
self.slave_status.recordConnectTime()
# try to use TCP keepalives
try:
mind.broker.transport.setTcpKeepAlive(1)
except:
pass
if self.isConnected():
# duplicate slave - send it to arbitration
arb = botmaster.DuplicateSlaveArbitrator(self)
return arb.getPerspective(mind, slavename)
else:
log.msg("slave '%s' attaching from %s" %
(slavename, mind.broker.transport.getPeer()))
return self
def doKeepalive(self):
self.keepalive_timer = reactor.callLater(self.keepalive_interval,
self.doKeepalive)
if not self.slave:
return
d = self.slave.callRemote("print", "Received keepalive from master")
d.addErrback(log.msg, "Keepalive failed for '%s'" % (self.slavename, ))
def stopKeepaliveTimer(self):
if self.keepalive_timer:
self.keepalive_timer.cancel()
def startKeepaliveTimer(self):
assert self.keepalive_interval
log.msg("Starting buildslave keepalive timer for '%s'" %
(self.slavename, ))
self.doKeepalive()
def isConnected(self):
return self.slave
def _missing_timer_fired(self):
self.missing_timer = None
# notify people, but only if we're still in the config
if not self.parent:
return
buildmaster = self.botmaster.master
status = buildmaster.getStatus()
text = "The Buildbot working for '%s'\n" % status.getTitle()
text += ("has noticed that the buildslave named %s went away\n" %
self.slavename)
text += "\n"
text += ("It last disconnected at %s (buildmaster-local time)\n" %
time.ctime(time.time() - self.missing_timeout)) # approx
text += "\n"
text += "The admin on record (as reported by BUILDSLAVE:info/admin)\n"
text += "was '%s'.\n" % self.slave_status.getAdmin()
text += "\n"
text += "Sincerely,\n"
text += " The Buildbot\n"
text += " %s\n" % status.getTitleURL()
text += "\n"
text += "%s\n" % status.getURLForThing(self.slave_status)
subject = "Buildbot: buildslave %s was lost" % self.slavename
return self._mail_missing_message(subject, text)
def updateSlave(self):
"""Called to add or remove builders after the slave has connected.
@return: a Deferred that indicates when an attached slave has
accepted the new builders and/or released the old ones."""
if self.slave:
return self.sendBuilderList()
else:
return defer.succeed(None)
def updateSlaveStatus(self, buildStarted=None, buildFinished=None):
if buildStarted:
self.slave_status.buildStarted(buildStarted)
if buildFinished:
self.slave_status.buildFinished(buildFinished)
def attached(self, bot):
"""This is called when the slave connects.
@return: a Deferred that fires when the attachment is complete
"""
# the botmaster should ensure this.
assert not self.isConnected()
metrics.MetricCountEvent.log("AbstractBuildSlave.attached_slaves", 1)
# set up the subscription point for eventual detachment
self.detached_subs = subscription.SubscriptionPoint("detached")
# now we go through a sequence of calls, gathering information, then
# tell the Botmaster that it can finally give this slave to all the
# Builders that care about it.
# we accumulate slave information in this 'state' dictionary, then
# set it atomically if we make it far enough through the process
state = {}
# Reset graceful shutdown status
self.slave_status.setGraceful(False)
# We want to know when the graceful shutdown flag changes
self.slave_status.addGracefulWatcher(self._gracefulChanged)
self.slave_status.addPauseWatcher(self._pauseChanged)
d = defer.succeed(None)
@d.addCallback
def _log_attachment_on_slave(res):
d1 = bot.callRemote("print", "attached")
d1.addErrback(lambda why: None)
return d1
@d.addCallback
def _get_info(res):
d1 = bot.callRemote("getSlaveInfo")
def _got_info(info):
log.msg("Got slaveinfo from '%s'" % self.slavename)
# TODO: info{} might have other keys
state["admin"] = info.get("admin")
state["host"] = info.get("host")
state["access_uri"] = info.get("access_uri", None)
state["slave_environ"] = info.get("environ", {})
state["slave_basedir"] = info.get("basedir", None)
state["slave_system"] = info.get("system", None)
def _info_unavailable(why):
why.trap(pb.NoSuchMethod)
# maybe an old slave, doesn't implement remote_getSlaveInfo
log.msg("BuildSlave.info_unavailable")
log.err(why)
d1.addCallbacks(_got_info, _info_unavailable)
return d1
d.addCallback(lambda _: self.startKeepaliveTimer())
@d.addCallback
def _get_version(_):
d = bot.callRemote("getVersion")
def _got_version(version):
state["version"] = version
def _version_unavailable(why):
why.trap(pb.NoSuchMethod)
# probably an old slave
state["version"] = '(unknown)'
d.addCallbacks(_got_version, _version_unavailable)
return d
@d.addCallback
def _get_commands(_):
d1 = bot.callRemote("getCommands")
def _got_commands(commands):
state["slave_commands"] = commands
def _commands_unavailable(why):
# probably an old slave
if why.check(AttributeError):
return
log.msg("BuildSlave.getCommands is unavailable - ignoring")
log.err(why)
d1.addCallbacks(_got_commands, _commands_unavailable)
return d1
@d.addCallback
def _accept_slave(res):
self.slave_status.setConnected(True)
self.slave_status.updateInfo(
admin=state.get("admin"),
host=state.get("host"),
access_uri=state.get("access_uri"),
version=state.get("version"),
)
self.slave_commands = state.get("slave_commands")
self.slave_environ = state.get("slave_environ")
self.slave_basedir = state.get("slave_basedir")
self.slave_system = state.get("slave_system")
self.slave = bot
if self.slave_system == "nt":
self.path_module = namedModule("ntpath")
else:
# most everything accepts / as separator, so posix should be a
# reasonable fallback
self.path_module = namedModule("posixpath")
log.msg("bot attached")
self.messageReceivedFromSlave()
self.stopMissingTimer()
self.master.status.slaveConnected(self.slavename)
d.addCallback(lambda _: self.updateSlave())
d.addCallback(
lambda _: self.botmaster.maybeStartBuildsForSlave(self.slavename))
# Finally, the slave gets a reference to this BuildSlave. They
# receive this later, after we've started using them.
d.addCallback(lambda _: self)
return d
def messageReceivedFromSlave(self):
now = time.time()
self.lastMessageReceived = now
self.slave_status.setLastMessageReceived(now)
def detached(self, mind):
metrics.MetricCountEvent.log("AbstractBuildSlave.attached_slaves", -1)
self.slave = None
self._old_builder_list = []
self.slave_status.removeGracefulWatcher(self._gracefulChanged)
self.slave_status.removePauseWatcher(self._pauseChanged)
self.slave_status.setConnected(False)
log.msg("BuildSlave.detached(%s)" % self.slavename)
self.master.status.slaveDisconnected(self.slavename)
self.stopKeepaliveTimer()
self.releaseLocks()
# notify watchers, but do so in the next reactor iteration so that
# any further detached() action by subclasses happens first
def notif():
subs = self.detached_subs
self.detached_subs = None
subs.deliver()
eventually(notif)
def subscribeToDetach(self, callback):
"""
Request that C{callable} be invoked with no arguments when the
L{detached} method is invoked.
@returns: L{Subscription}
"""
assert self.detached_subs, "detached_subs is only set if attached"
return self.detached_subs.subscribe(callback)
def disconnect(self):
"""Forcibly disconnect the slave.
This severs the TCP connection and returns a Deferred that will fire
(with None) when the connection is probably gone.
If the slave is still alive, they will probably try to reconnect
again in a moment.
This is called in two circumstances. The first is when a slave is
removed from the config file. In this case, when they try to
reconnect, they will be rejected as an unknown slave. The second is
when we wind up with two connections for the same slave, in which
case we disconnect the older connection.
"""
if not self.slave:
return defer.succeed(None)
log.msg("disconnecting old slave %s now" % self.slavename)
# When this Deferred fires, we'll be ready to accept the new slave
return self._disconnect(self.slave)
def _disconnect(self, slave):
# all kinds of teardown will happen as a result of
# loseConnection(), but it happens after a reactor iteration or
# two. Hook the actual disconnect so we can know when it is safe
# to connect the new slave. We have to wait one additional
# iteration (with callLater(0)) to make sure the *other*
# notifyOnDisconnect handlers have had a chance to run.
d = defer.Deferred()
# notifyOnDisconnect runs the callback with one argument, the
# RemoteReference being disconnected.
def _disconnected(rref):
eventually(d.callback, None)
slave.notifyOnDisconnect(_disconnected)
tport = slave.broker.transport
# this is the polite way to request that a socket be closed
tport.loseConnection()
try:
# but really we don't want to wait for the transmit queue to
# drain. The remote end is unlikely to ACK the data, so we'd
# probably have to wait for a (20-minute) TCP timeout.
# tport._closeSocket()
# however, doing _closeSocket (whether before or after
# loseConnection) somehow prevents the notifyOnDisconnect
# handlers from being run. Bummer.
tport.offset = 0
tport.dataBuffer = ""
except:
# however, these hacks are pretty internal, so don't blow up if
# they fail or are unavailable
log.msg("failed to accelerate the shutdown process")
log.msg("waiting for slave to finish disconnecting")
return d
def sendBuilderList(self):
our_builders = self.botmaster.getBuildersForSlave(self.slavename)
blist = [(b.name, b.config.slavebuilddir) for b in our_builders]
if blist == self._old_builder_list:
return defer.succeed(None)
d = self.slave.callRemote("setBuilderList", blist)
def sentBuilderList(ign):
self._old_builder_list = blist
return ign
d.addCallback(sentBuilderList)
return d
def perspective_keepalive(self):
self.messageReceivedFromSlave()
def perspective_shutdown(self):
log.msg("slave %s wants to shut down" % self.slavename)
self.slave_status.setGraceful(True)
def addSlaveBuilder(self, sb):
self.slavebuilders[sb.builder_name] = sb
def removeSlaveBuilder(self, sb):
try:
del self.slavebuilders[sb.builder_name]
except KeyError:
pass
def buildFinished(self, sb):
"""This is called when a build on this slave is finished."""
self.botmaster.maybeStartBuildsForSlave(self.slavename)
def canStartBuild(self):
"""
I am called when a build is requested to see if this buildslave
can start a build. This function can be used to limit overall
concurrency on the buildslave.
Note for subclassers: if a slave can become willing to start a build
without any action on that slave (for example, by a resource in use on
another slave becoming available), then you must arrange for
L{maybeStartBuildsForSlave} to be called at that time, or builds on
this slave will not start.
"""
if self.slave_status.isPaused():
return False
# If we're waiting to shutdown gracefully, then we shouldn't
# accept any new jobs.
if self.slave_status.getGraceful():
return False
if self.max_builds:
active_builders = [
sb for sb in self.slavebuilders.values() if sb.isBusy()
]
if len(active_builders) >= self.max_builds:
return False
if not self.locksAvailable():
return False
return True
def _mail_missing_message(self, subject, text):
# first, see if we have a MailNotifier we can use. This gives us a
# fromaddr and a relayhost.
buildmaster = self.botmaster.master
for st in buildmaster.status:
if isinstance(st, MailNotifier):
break
else:
# if not, they get a default MailNotifier, which always uses SMTP
# to localhost and uses a dummy fromaddr of "buildbot".
log.msg("buildslave-missing msg using default MailNotifier")
st = MailNotifier("buildbot")
# now construct the mail
m = Message()
m.set_payload(text)
m['Date'] = formatdate(localtime=True)
m['Subject'] = subject
m['From'] = st.fromaddr
recipients = self.notify_on_missing
m['To'] = ", ".join(recipients)
d = st.sendMessage(m, recipients)
# return the Deferred for testing purposes
return d
def _gracefulChanged(self, graceful):
"""This is called when our graceful shutdown setting changes"""
self.maybeShutdown()
@defer.inlineCallbacks
def shutdown(self):
"""Shutdown the slave"""
if not self.slave:
log.msg("no remote; slave is already shut down")
return
# First, try the "new" way - calling our own remote's shutdown
# method. The method was only added in 0.8.3, so ignore NoSuchMethod
# failures.
def new_way():
d = self.slave.callRemote('shutdown')
d.addCallback(lambda _: True) # successful shutdown request
def check_nsm(f):
f.trap(pb.NoSuchMethod)
return False # fall through to the old way
d.addErrback(check_nsm)
def check_connlost(f):
f.trap(pb.PBConnectionLost)
return True # the slave is gone, so call it finished
d.addErrback(check_connlost)
return d
if (yield new_way()):
return # done!
# Now, the old way. Look for a builder with a remote reference to the
# client side slave. If we can find one, then call "shutdown" on the
# remote builder, which will cause the slave buildbot process to exit.
def old_way():
d = None
for b in self.slavebuilders.values():
if b.remote:
d = b.remote.callRemote("shutdown")
break
if d:
log.msg("Shutting down (old) slave: %s" % self.slavename)
# The remote shutdown call will not complete successfully since the
# buildbot process exits almost immediately after getting the
# shutdown request.
# Here we look at the reason why the remote call failed, and if
# it's because the connection was lost, that means the slave
# shutdown as expected.
def _errback(why):
if why.check(pb.PBConnectionLost):
log.msg("Lost connection to %s" % self.slavename)
else:
log.err("Unexpected error when trying to shutdown %s" %
self.slavename)
d.addErrback(_errback)
return d
log.err("Couldn't find remote builder to shut down slave")
return defer.succeed(None)
yield old_way()
def maybeShutdown(self):
"""Shut down this slave if it has been asked to shut down gracefully,
and has no active builders."""
if not self.slave_status.getGraceful():
return
active_builders = [
sb for sb in self.slavebuilders.values() if sb.isBusy()
]
if active_builders:
return
d = self.shutdown()
d.addErrback(log.err, 'error while shutting down slave')
def _pauseChanged(self, paused):
if paused is True:
self.botmaster.master.status.slavePaused(self.slavename)
else:
self.botmaster.master.status.slaveUnpaused(self.slavename)
def pause(self):
"""Stop running new builds on the slave."""
self.slave_status.setPaused(True)
def unpause(self):
"""Restart running new builds on the slave."""
self.slave_status.setPaused(False)
self.botmaster.maybeStartBuildsForSlave(self.slavename)
def isPaused(self):
return self.slave_status.isPaused()
class AbstractBuildSlave(config.ReconfigurableServiceMixin, pb.Avatar, service.MultiService):
"""This is the master-side representative for a remote buildbot slave.
There is exactly one for each slave described in the config file (the
c['slaves'] list). When buildbots connect in (.attach), they get a
reference to this instance. The BotMaster object is stashed as the
.botmaster attribute. The BotMaster is also our '.parent' Service.
I represent a build slave -- a remote machine capable of
running builds. I am instantiated by the configuration file, and can be
subclassed to add extra functionality."""
implements(IBuildSlave)
keepalive_timer = None
keepalive_interval = None
# reconfig slaves after builders
reconfig_priority = 64
def __init__(
self,
name,
password,
max_builds=None,
notify_on_missing=[],
missing_timeout=3600,
properties={},
locks=None,
keepalive_interval=3600,
):
"""
@param name: botname this machine will supply when it connects
@param password: password this machine will supply when
it connects
@param max_builds: maximum number of simultaneous builds that will
be run concurrently on this buildslave (the
default is None for no limit)
@param properties: properties that will be applied to builds run on
this slave
@type properties: dictionary
@param locks: A list of locks that must be acquired before this slave
can be used
@type locks: dictionary
"""
service.MultiService.__init__(self)
self.slavename = name
self.password = password
# PB registration
self.registration = None
self.registered_port = None
# these are set when the service is started, and unset when it is
# stopped
self.botmaster = None
self.master = None
self.slave_status = SlaveStatus(name)
self.slave = None # a RemoteReference to the Bot, when connected
self.slave_commands = None
self.slavebuilders = {}
self.max_builds = max_builds
self.access = []
if locks:
self.access = locks
self.lock_subscriptions = []
self.properties = Properties()
self.properties.update(properties, "BuildSlave")
self.properties.setProperty("slavename", name, "BuildSlave")
self.lastMessageReceived = 0
if isinstance(notify_on_missing, str):
notify_on_missing = [notify_on_missing]
self.notify_on_missing = notify_on_missing
for i in notify_on_missing:
if not isinstance(i, str):
config.error("notify_on_missing arg %r is not a string" % (i,))
self.missing_timeout = missing_timeout
self.missing_timer = None
self.keepalive_interval = keepalive_interval
self.detached_subs = None
self._old_builder_list = None
def __repr__(self):
return "<%s %r>" % (self.__class__.__name__, self.slavename)
def updateLocks(self):
"""Convert the L{LockAccess} objects in C{self.locks} into real lock
objects, while also maintaining the subscriptions to lock releases."""
# unsubscribe from any old locks
for s in self.lock_subscriptions:
s.unsubscribe()
# convert locks into their real form
locks = [(self.botmaster.getLockFromLockAccess(a), a) for a in self.access]
self.locks = [(l.getLock(self), la) for l, la in locks]
self.lock_subscriptions = [l.subscribeToReleases(self._lockReleased) for l, la in self.locks]
def locksAvailable(self):
"""
I am called to see if all the locks I depend on are available,
in which I return True, otherwise I return False
"""
if not self.locks:
return True
for lock, access in self.locks:
if not lock.isAvailable(self, access):
return False
return True
def acquireLocks(self):
"""
I am called when a build is preparing to run. I try to claim all
the locks that are needed for a build to happen. If I can't, then
my caller should give up the build and try to get another slave
to look at it.
"""
log.msg("acquireLocks(slave %s, locks %s)" % (self, self.locks))
if not self.locksAvailable():
log.msg("slave %s can't lock, giving up" % (self,))
return False
# all locks are available, claim them all
for lock, access in self.locks:
lock.claim(self, access)
return True
def releaseLocks(self):
"""
I am called to release any locks after a build has finished
"""
log.msg("releaseLocks(%s): %s" % (self, self.locks))
for lock, access in self.locks:
lock.release(self, access)
def _lockReleased(self):
"""One of the locks for this slave was released; try scheduling
builds."""
if not self.botmaster:
return # oh well..
self.botmaster.maybeStartBuildsForSlave(self.slavename)
def _saveSlaveInfoDict(self, slaveinfo):
return self.master.db.buildslaves.updateBuildslave(name=self.slavename, slaveinfo=slaveinfo)
def _getSlaveInfo(self):
d = self.master.db.buildslaves.getBuildslaveByName(self.slavename)
@d.addCallback
def applyInfo(buildslave):
if buildslave is None:
return
self.updateSlaveInfo(**buildslave["slaveinfo"])
return d
def updateSlaveInfo(self, **kwargs):
self.slave_status.updateInfo(**kwargs)
def getSlaveInfo(self, key, default=None):
return self.slave_status.getInfo(key, default)
def setServiceParent(self, parent):
# botmaster needs to set before setServiceParent which calls startService
self.botmaster = parent
self.master = parent.master
service.MultiService.setServiceParent(self, parent)
def startService(self):
self.updateLocks()
self.startMissingTimer()
self.slave_status.addInfoWatcher(self._saveSlaveInfoDict)
d = self._getSlaveInfo()
d.addCallback(lambda _: service.MultiService.startService(self))
return d
@defer.inlineCallbacks
def reconfigService(self, new_config):
# Given a new BuildSlave, configure this one identically. Because
# BuildSlave objects are remotely referenced, we can't replace them
# without disconnecting the slave, yet there's no reason to do that.
new = self.findNewSlaveInstance(new_config)
assert self.slavename == new.slavename
# do we need to re-register?
if (
not self.registration
or self.password != new.password
or new_config.protocols["pb"]["port"] != self.registered_port
):
if self.registration:
yield self.registration.unregister()
self.registration = None
self.password = new.password
self.registered_port = new_config.protocols["pb"]["port"]
self.registration = self.master.pbmanager.register(
self.registered_port, self.slavename, self.password, self.getPerspective
)
# adopt new instance's configuration parameters
self.max_builds = new.max_builds
self.access = new.access
self.notify_on_missing = new.notify_on_missing
self.keepalive_interval = new.keepalive_interval
if self.missing_timeout != new.missing_timeout:
running_missing_timer = self.missing_timer
self.stopMissingTimer()
self.missing_timeout = new.missing_timeout
if running_missing_timer:
self.startMissingTimer()
properties = Properties()
properties.updateFromProperties(new.properties)
self.properties = properties
self.updateLocks()
# update the attached slave's notion of which builders are attached.
# This assumes that the relevant builders have already been configured,
# which is why the reconfig_priority is set low in this class.
yield self.updateSlave()
yield config.ReconfigurableServiceMixin.reconfigService(self, new_config)
def stopService(self):
self.slave_status.removeInfoWatcher(self._saveSlaveInfoDict)
if self.registration:
self.registration.unregister()
self.registration = None
self.stopMissingTimer()
return service.MultiService.stopService(self)
def findNewSlaveInstance(self, new_config):
# TODO: called multiple times per reconfig; use 1-element cache?
for sl in new_config.slaves:
if sl.slavename == self.slavename:
return sl
assert 0, "no new slave named '%s'" % self.slavename
def startMissingTimer(self):
if self.notify_on_missing and self.missing_timeout and self.parent:
self.stopMissingTimer() # in case it's already running
self.missing_timer = reactor.callLater(self.missing_timeout, self._missing_timer_fired)
def stopMissingTimer(self):
if self.missing_timer:
self.missing_timer.cancel()
self.missing_timer = None
def getPerspective(self, mind, slavename):
assert slavename == self.slavename
metrics.MetricCountEvent.log("attached_slaves", 1)
# record when this connection attempt occurred
if self.slave_status:
self.slave_status.recordConnectTime()
# try to use TCP keepalives
try:
mind.broker.transport.setTcpKeepAlive(1)
except:
pass
if self.isConnected():
# duplicate slave - send it to arbitration
arb = botmaster.DuplicateSlaveArbitrator(self)
return arb.getPerspective(mind, slavename)
else:
log.msg("slave '%s' attaching from %s" % (slavename, mind.broker.transport.getPeer()))
return self
def doKeepalive(self):
self.keepalive_timer = reactor.callLater(self.keepalive_interval, self.doKeepalive)
if not self.slave:
return
d = self.slave.callRemote("print", "Received keepalive from master")
d.addErrback(log.msg, "Keepalive failed for '%s'" % (self.slavename,))
def stopKeepaliveTimer(self):
if self.keepalive_timer:
self.keepalive_timer.cancel()
def startKeepaliveTimer(self):
assert self.keepalive_interval
log.msg("Starting buildslave keepalive timer for '%s'" % (self.slavename,))
self.doKeepalive()
def isConnected(self):
return self.slave
def _missing_timer_fired(self):
self.missing_timer = None
# notify people, but only if we're still in the config
if not self.parent:
return
buildmaster = self.botmaster.master
status = buildmaster.getStatus()
text = "The Buildbot working for '%s'\n" % status.getTitle()
text += "has noticed that the buildslave named %s went away\n" % self.slavename
text += "\n"
text += "It last disconnected at %s (buildmaster-local time)\n" % time.ctime(
time.time() - self.missing_timeout
) # approx
text += "\n"
text += "The admin on record (as reported by BUILDSLAVE:info/admin)\n"
text += "was '%s'.\n" % self.slave_status.getAdmin()
text += "\n"
text += "Sincerely,\n"
text += " The Buildbot\n"
text += " %s\n" % status.getTitleURL()
text += "\n"
text += "%s\n" % status.getURLForThing(self.slave_status)
subject = "Buildbot: buildslave %s was lost" % self.slavename
return self._mail_missing_message(subject, text)
def updateSlave(self):
"""Called to add or remove builders after the slave has connected.
@return: a Deferred that indicates when an attached slave has
accepted the new builders and/or released the old ones."""
if self.slave:
return self.sendBuilderList()
else:
return defer.succeed(None)
def updateSlaveStatus(self, buildStarted=None, buildFinished=None):
if buildStarted:
self.slave_status.buildStarted(buildStarted)
if buildFinished:
self.slave_status.buildFinished(buildFinished)
@metrics.countMethod("AbstractBuildSlave.attached()")
def attached(self, bot):
"""This is called when the slave connects.
@return: a Deferred that fires when the attachment is complete
"""
# the botmaster should ensure this.
assert not self.isConnected()
metrics.MetricCountEvent.log("AbstractBuildSlave.attached_slaves", 1)
# set up the subscription point for eventual detachment
self.detached_subs = subscription.SubscriptionPoint("detached")
# now we go through a sequence of calls, gathering information, then
# tell the Botmaster that it can finally give this slave to all the
# Builders that care about it.
# we accumulate slave information in this 'state' dictionary, then
# set it atomically if we make it far enough through the process
state = {}
# Reset graceful shutdown status
self.slave_status.setGraceful(False)
# We want to know when the graceful shutdown flag changes
self.slave_status.addGracefulWatcher(self._gracefulChanged)
self.slave_status.addPauseWatcher(self._pauseChanged)
d = defer.succeed(None)
@d.addCallback
def _log_attachment_on_slave(res):
d1 = bot.callRemote("print", "attached")
d1.addErrback(lambda why: None)
return d1
@d.addCallback
def _get_info(res):
d1 = bot.callRemote("getSlaveInfo")
def _got_info(info):
log.msg("Got slaveinfo from '%s'" % self.slavename)
# TODO: info{} might have other keys
state["admin"] = info.get("admin")
state["host"] = info.get("host")
state["access_uri"] = info.get("access_uri", None)
state["slave_environ"] = info.get("environ", {})
state["slave_basedir"] = info.get("basedir", None)
state["slave_system"] = info.get("system", None)
def _info_unavailable(why):
why.trap(pb.NoSuchMethod)
# maybe an old slave, doesn't implement remote_getSlaveInfo
log.msg("BuildSlave.info_unavailable")
log.err(why)
d1.addCallbacks(_got_info, _info_unavailable)
return d1
d.addCallback(lambda _: self.startKeepaliveTimer())
@d.addCallback
def _get_version(_):
d = bot.callRemote("getVersion")
def _got_version(version):
state["version"] = version
def _version_unavailable(why):
why.trap(pb.NoSuchMethod)
# probably an old slave
state["version"] = "(unknown)"
d.addCallbacks(_got_version, _version_unavailable)
return d
@d.addCallback
def _get_commands(_):
d1 = bot.callRemote("getCommands")
def _got_commands(commands):
state["slave_commands"] = commands
def _commands_unavailable(why):
# probably an old slave
if why.check(AttributeError):
return
log.msg("BuildSlave.getCommands is unavailable - ignoring")
log.err(why)
d1.addCallbacks(_got_commands, _commands_unavailable)
return d1
@d.addCallback
def _accept_slave(res):
self.slave_status.setConnected(True)
self.slave_status.updateInfo(
admin=state.get("admin"),
host=state.get("host"),
access_uri=state.get("access_uri"),
version=state.get("version"),
)
self.slave_commands = state.get("slave_commands")
self.slave_environ = state.get("slave_environ")
self.slave_basedir = state.get("slave_basedir")
self.slave_system = state.get("slave_system")
self.slave = bot
if self.slave_system == "nt":
self.path_module = namedModule("ntpath")
else:
# most everything accepts / as separator, so posix should be a
# reasonable fallback
self.path_module = namedModule("posixpath")
log.msg("bot attached")
self.messageReceivedFromSlave()
self.stopMissingTimer()
self.botmaster.master.status.slaveConnected(self.slavename)
d.addCallback(lambda _: self.updateSlave())
d.addCallback(lambda _: self.botmaster.maybeStartBuildsForSlave(self.slavename))
# Finally, the slave gets a reference to this BuildSlave. They
# receive this later, after we've started using them.
d.addCallback(lambda _: self)
return d
def messageReceivedFromSlave(self):
now = time.time()
self.lastMessageReceived = now
self.slave_status.setLastMessageReceived(now)
def detached(self, mind):
metrics.MetricCountEvent.log("AbstractBuildSlave.attached_slaves", -1)
self.slave = None
self._old_builder_list = []
self.slave_status.removeGracefulWatcher(self._gracefulChanged)
self.slave_status.removePauseWatcher(self._pauseChanged)
self.slave_status.setConnected(False)
log.msg("BuildSlave.detached(%s)" % self.slavename)
self.botmaster.master.status.slaveDisconnected(self.slavename)
self.stopKeepaliveTimer()
self.releaseLocks()
# notify watchers, but do so in the next reactor iteration so that
# any further detached() action by subclasses happens first
def notif():
subs = self.detached_subs
self.detached_subs = None
subs.deliver()
eventually(notif)
def subscribeToDetach(self, callback):
"""
Request that C{callable} be invoked with no arguments when the
L{detached} method is invoked.
@returns: L{Subscription}
"""
assert self.detached_subs, "detached_subs is only set if attached"
return self.detached_subs.subscribe(callback)
def disconnect(self):
"""Forcibly disconnect the slave.
This severs the TCP connection and returns a Deferred that will fire
(with None) when the connection is probably gone.
If the slave is still alive, they will probably try to reconnect
again in a moment.
This is called in two circumstances. The first is when a slave is
removed from the config file. In this case, when they try to
reconnect, they will be rejected as an unknown slave. The second is
when we wind up with two connections for the same slave, in which
case we disconnect the older connection.
"""
if not self.slave:
return defer.succeed(None)
log.msg("disconnecting old slave %s now" % self.slavename)
# When this Deferred fires, we'll be ready to accept the new slave
return self._disconnect(self.slave)
def _disconnect(self, slave):
# all kinds of teardown will happen as a result of
# loseConnection(), but it happens after a reactor iteration or
# two. Hook the actual disconnect so we can know when it is safe
# to connect the new slave. We have to wait one additional
# iteration (with callLater(0)) to make sure the *other*
# notifyOnDisconnect handlers have had a chance to run.
d = defer.Deferred()
# notifyOnDisconnect runs the callback with one argument, the
# RemoteReference being disconnected.
def _disconnected(rref):
eventually(d.callback, None)
slave.notifyOnDisconnect(_disconnected)
tport = slave.broker.transport
# this is the polite way to request that a socket be closed
tport.loseConnection()
try:
# but really we don't want to wait for the transmit queue to
# drain. The remote end is unlikely to ACK the data, so we'd
# probably have to wait for a (20-minute) TCP timeout.
# tport._closeSocket()
# however, doing _closeSocket (whether before or after
# loseConnection) somehow prevents the notifyOnDisconnect
# handlers from being run. Bummer.
tport.offset = 0
tport.dataBuffer = ""
except:
# however, these hacks are pretty internal, so don't blow up if
# they fail or are unavailable
log.msg("failed to accelerate the shutdown process")
log.msg("waiting for slave to finish disconnecting")
return d
def sendBuilderList(self):
our_builders = self.botmaster.getBuildersForSlave(self.slavename)
blist = [(b.name, b.config.slavebuilddir) for b in our_builders]
if blist == self._old_builder_list:
return defer.succeed(None)
d = self.slave.callRemote("setBuilderList", blist)
def sentBuilderList(ign):
self._old_builder_list = blist
return ign
d.addCallback(sentBuilderList)
return d
def perspective_keepalive(self):
self.messageReceivedFromSlave()
def perspective_shutdown(self):
log.msg("slave %s wants to shut down" % self.slavename)
self.slave_status.setGraceful(True)
def addSlaveBuilder(self, sb):
self.slavebuilders[sb.builder_name] = sb
def removeSlaveBuilder(self, sb):
try:
del self.slavebuilders[sb.builder_name]
except KeyError:
pass
def buildFinished(self, sb):
"""This is called when a build on this slave is finished."""
self.botmaster.maybeStartBuildsForSlave(self.slavename)
def canStartBuild(self):
"""
I am called when a build is requested to see if this buildslave
can start a build. This function can be used to limit overall
concurrency on the buildslave.
Note for subclassers: if a slave can become willing to start a build
without any action on that slave (for example, by a resource in use on
another slave becoming available), then you must arrange for
L{maybeStartBuildsForSlave} to be called at that time, or builds on
this slave will not start.
"""
if self.slave_status.isPaused():
return False
# If we're waiting to shutdown gracefully, then we shouldn't
# accept any new jobs.
if self.slave_status.getGraceful():
return False
if self.max_builds:
active_builders = [sb for sb in self.slavebuilders.values() if sb.isBusy()]
if len(active_builders) >= self.max_builds:
return False
if not self.locksAvailable():
return False
return True
def _mail_missing_message(self, subject, text):
# first, see if we have a MailNotifier we can use. This gives us a
# fromaddr and a relayhost.
buildmaster = self.botmaster.master
for st in buildmaster.status:
if isinstance(st, MailNotifier):
break
else:
# if not, they get a default MailNotifier, which always uses SMTP
# to localhost and uses a dummy fromaddr of "buildbot".
log.msg("buildslave-missing msg using default MailNotifier")
st = MailNotifier("buildbot")
# now construct the mail
m = Message()
m.set_payload(text)
m["Date"] = formatdate(localtime=True)
m["Subject"] = subject
m["From"] = st.fromaddr
recipients = self.notify_on_missing
m["To"] = ", ".join(recipients)
d = st.sendMessage(m, recipients)
# return the Deferred for testing purposes
return d
def _gracefulChanged(self, graceful):
"""This is called when our graceful shutdown setting changes"""
self.maybeShutdown()
@defer.inlineCallbacks
def shutdown(self):
"""Shutdown the slave"""
if not self.slave:
log.msg("no remote; slave is already shut down")
return
# First, try the "new" way - calling our own remote's shutdown
# method. The method was only added in 0.8.3, so ignore NoSuchMethod
# failures.
def new_way():
d = self.slave.callRemote("shutdown")
d.addCallback(lambda _: True) # successful shutdown request
def check_nsm(f):
f.trap(pb.NoSuchMethod)
return False # fall through to the old way
d.addErrback(check_nsm)
def check_connlost(f):
f.trap(pb.PBConnectionLost)
return True # the slave is gone, so call it finished
d.addErrback(check_connlost)
return d
if (yield new_way()):
return # done!
# Now, the old way. Look for a builder with a remote reference to the
# client side slave. If we can find one, then call "shutdown" on the
# remote builder, which will cause the slave buildbot process to exit.
def old_way():
d = None
for b in self.slavebuilders.values():
if b.remote:
d = b.remote.callRemote("shutdown")
break
if d:
log.msg("Shutting down (old) slave: %s" % self.slavename)
# The remote shutdown call will not complete successfully since the
# buildbot process exits almost immediately after getting the
# shutdown request.
# Here we look at the reason why the remote call failed, and if
# it's because the connection was lost, that means the slave
# shutdown as expected.
def _errback(why):
if why.check(pb.PBConnectionLost):
log.msg("Lost connection to %s" % self.slavename)
else:
log.err("Unexpected error when trying to shutdown %s" % self.slavename)
d.addErrback(_errback)
return d
log.err("Couldn't find remote builder to shut down slave")
return defer.succeed(None)
yield old_way()
def maybeShutdown(self):
"""Shut down this slave if it has been asked to shut down gracefully,
and has no active builders."""
if not self.slave_status.getGraceful():
return
active_builders = [sb for sb in self.slavebuilders.values() if sb.isBusy()]
if active_builders:
return
d = self.shutdown()
d.addErrback(log.err, "error while shutting down slave")
def _pauseChanged(self, paused):
if paused is True:
self.botmaster.master.status.slavePaused(self.slavename)
else:
self.botmaster.master.status.slaveUnpaused(self.slavename)
def pause(self):
"""Stop running new builds on the slave."""
self.slave_status.setPaused(True)
def unpause(self):
"""Restart running new builds on the slave."""
self.slave_status.setPaused(False)
self.botmaster.maybeStartBuildsForSlave(self.slavename)
def isPaused(self):
return self.slave_status.isPaused()
