def try_launch_container(cls, user_id, max_hop=False):
sessname = unique_sessname(user_id)
cont = SessContainer.get_by_name(sessname)
cls.log_debug("have existing container for %s: %r", sessname,
None != cont)
if cont is not None:
cls.log_debug("container running: %r", cont.is_running())
if max_hop:
self_load = Compute.get_instance_stats(Compute.get_instance_id(),
'Load')
if self_load < 100:
SessContainer.invalidate_container(sessname)
JBoxAsyncJob.async_launch_by_name(sessname, user_id, True)
return True
is_leader = is_proposed_cluster_leader()
if ((cont is None) or (not cont.is_running())) and (
not Compute.should_accept_session(is_leader)):
if cont is not None:
SessContainer.invalidate_container(cont.get_name())
JBoxAsyncJob.async_backup_and_cleanup(cont.dockid)
return False
SessContainer.invalidate_container(sessname)
JBoxAsyncJob.async_launch_by_name(sessname, user_id, True)
return True
def is_cluster_leader():
self_id = Compute.get_instance_id()
cluster = Compute.get_install_id()
instances = Compute.get_all_instances()
leader = JBoxDynConfig.get_cluster_leader(cluster)
img_recentness = Compute.get_image_recentness()
JBoxDB.log_debug("cluster: %s. instances: %s. leader: %s. image recentness: %d",
cluster, repr(instances), repr(leader), img_recentness)
# if none set, or set instance is dead elect self as leader, but wait till next cycle to prevent conflicts
if (leader is None) or (leader not in instances) and (img_recentness >= 0):
JBoxDB.log_info("setting self (%s) as cluster leader", self_id)
try:
JBoxDynConfig.set_cluster_leader(cluster, self_id)
except:
JBoxDB.log_info("error setting self (%s) as cluster leader, will retry", self_id)
return False
is_leader = (leader == self_id)
# if running an older ami, step down from cluster leader
if (img_recentness < 0) and is_leader:
JBoxDB.log_info("unmarking self (%s) as cluster leader", self_id)
JBoxDynConfig.unset_cluster_leader(cluster)
return False
return is_leader
def is_cluster_leader():
self_id = Compute.get_instance_id()
cluster = Compute.get_install_id()
instances = Compute.get_all_instances()
leader = JBoxDynConfig.get_cluster_leader(cluster)
img_recentness = Compute.get_image_recentness()
JBoxDB.log_debug(
"cluster: %s. instances: %s. leader: %s. image recentness: %d",
cluster, repr(instances), repr(leader), img_recentness)
# if none set, or set instance is dead elect self as leader, but wait till next cycle to prevent conflicts
if (leader is None) or (leader not in instances) and (img_recentness >= 0):
JBoxDB.log_info("setting self (%s) as cluster leader", self_id)
try:
JBoxDynConfig.set_cluster_leader(cluster, self_id)
except:
JBoxDB.log_info(
"error setting self (%s) as cluster leader, will retry",
self_id)
return False
is_leader = (leader == self_id)
# if running an older ami, step down from cluster leader
if (img_recentness < 0) and is_leader:
JBoxDB.log_info("unmarking self (%s) as cluster leader", self_id)
JBoxDynConfig.unset_cluster_leader(cluster)
return False
return is_leader
def redirect_to_logged_in_instance(self, user_id):
loggedin_instance = self.find_logged_in_instance(user_id)
if loggedin_instance is not None \
and loggedin_instance != Compute.get_instance_id() \
and loggedin_instance != 'localhost':
# redirect to the instance that has the user's session
self.log_info("Already logged in to %s. Redirecting", loggedin_instance)
redirect_ip = Compute.get_instance_local_ip(loggedin_instance)
self.set_redirect_instance_id(redirect_ip)
self.redirect('/')
return True
self.log_info("Logged in %s", "nowhere" if loggedin_instance is None else "here already")
return False
def redirect_to_logged_in_instance(self, user_id):
loggedin_instance = self.find_logged_in_instance(user_id)
if loggedin_instance is not None \
and loggedin_instance != Compute.get_instance_id() \
and loggedin_instance != 'localhost':
# redirect to the instance that has the user's session
self.log_info("Already logged in to %s. Redirecting",
loggedin_instance)
redirect_ip = Compute.get_instance_local_ip(loggedin_instance)
self.set_redirect_instance_id(redirect_ip)
self.redirect('/')
return True
self.log_info(
"Logged in %s",
"nowhere" if loggedin_instance is None else "here already")
return False
def try_launch_container(cls, user_id, max_hop=False):
sessname = unique_sessname(user_id)
cont = SessContainer.get_by_name(sessname)
cls.log_debug("have existing container for %s: %r", sessname, None != cont)
if cont is not None:
cls.log_debug("container running: %r", cont.is_running())
if max_hop:
self_load = Compute.get_instance_stats(Compute.get_instance_id(), 'Load')
if self_load < 100:
SessContainer.invalidate_container(sessname)
JBoxAsyncJob.async_launch_by_name(sessname, user_id, True)
return True
is_leader = is_proposed_cluster_leader()
if ((cont is None) or (not cont.is_running())) and (not Compute.should_accept_session(is_leader)):
if cont is not None:
SessContainer.invalidate_container(cont.get_name())
JBoxAsyncJob.async_backup_and_cleanup(cont.dockid)
return False
SessContainer.invalidate_container(sessname)
JBoxAsyncJob.async_launch_by_name(sessname, user_id, True)
return True
def is_proposed_cluster_leader():
cluster = Compute.get_install_id()
leader = JBoxDynConfig.get_cluster_leader(cluster)
return leader == Compute.get_instance_id()
def is_proposed_cluster_leader():
cluster = Compute.get_install_id()
leader = JBoxDynConfig.get_cluster_leader(cluster)
return leader == Compute.get_instance_id()
