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Reload Xend session params when we got an XenAPI.Failure exception

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Because we're caching e.g. uuid and metrics objects for the Xend session, we can get an exception
when the VM changed the power state between since we cached the object. We now catch this exception
and reload uuid and metrics object in the handler.
This commit is contained in:
Joanna Rutkowska 2010-05-08 16:28:13 +02:00
parent 56350e07e9
commit cd20eeb8a4
1 changed files with 54 additions and 26 deletions
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80
dom0/qvm-core/qubes.py
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@ -106,7 +106,8 @@ class XendSession(object):
print "get_xend_session_new_api(): cannot open session!"
xend_session = XendSession()
if not dry_run:
xend_session = XendSession()
class QubesException (Exception) : pass
@ -178,12 +179,7 @@ class QubesVm(object):
self.icon_path = self.dir_path + "/icon.png"
if not dry_run and xend_session.session is not None:
uuids = xend_session.session.xenapi.VM.get_by_name_label (self.name)
self.session_uuid = uuids[0] if len (uuids) > 0 else None
if self.session_uuid is not None:
self.session_metrics = xend_session.session.xenapi.VM.get_metrics(self.session_uuid)
else:
self.session_metrics = None
self.refresh_xend_session()
@property
def qid(self):
@ -273,39 +269,54 @@ class QubesVm(object):
self.in_xen_storage = False
def refresh_xend_session(self):
uuids = xend_session.session.xenapi.VM.get_by_name_label (self.name)
self.session_uuid = uuids[0] if len (uuids) > 0 else None
if self.session_uuid is not None:
self.session_metrics = xend_session.session.xenapi.VM.get_metrics(self.session_uuid)
else:
self.session_metrics = None
def update_xen_storage(self):
self.remove_from_xen_storage()
self.add_to_xen_storage()
if not dry_run and xend_session.session is not None:
uuids = xend_session.session.xenapi.VM.get_by_name_label (self.name)
self.session_uuid = uuids[0] if len (uuids) > 0 else None
if self.session_uuid is not None:
self.session_metrics = xend_session.session.xenapi.VM.get_metrics(self.session_uuid)
else:
self.session_metrics = None
self.refresh_xend_session()
def get_xid(self):
if dry_run:
return 666
xid = int (xend_session.session.xenapi.VM.get_domid (self.session_uuid))
try:
xid = int (xend_session.session.xenapi.VM.get_domid (self.session_uuid))
except XenAPI.Failure:
self.refresh_xend_session()
xid = int (xend_session.session.xenapi.VM.get_domid (self.session_uuid))
return xid
def get_mem(self):
if dry_run:
return 666
mem = int (xend_session.session.xenapi.VM_metrics.get_memory_actual (self.session_metrics))
try:
mem = int (xend_session.session.xenapi.VM_metrics.get_memory_actual (self.session_metrics))
except XenAPI.Failure:
self.refresh_xend_session()
mem = int (xend_session.session.xenapi.VM_metrics.get_memory_actual (self.session_metrics))
return mem
def get_mem_static_max(self):
if dry_run:
return 666
mem = int(xend_session.session.xenapi.VM.get_memory_static_max(self.session_uuid))
try:
mem = int(xend_session.session.xenapi.VM.get_memory_static_max(self.session_uuid))
except XenAPI.Failure:
self.refresh_xend_session()
mem = int(xend_session.session.xenapi.VM.get_memory_static_max(self.session_uuid))
return mem
@ -314,7 +325,12 @@ class QubesVm(object):
import random
return random.random() * 100
cpus_util = xend_session.session.xenapi.VM_metrics.get_VCPUs_utilisation (self.session_metrics)
try:
cpus_util = xend_session.session.xenapi.VM_metrics.get_VCPUs_utilisation (self.session_metrics)
except XenAPI.Failure:
self.refresh_xend_session()
cpus_util = xend_session.session.xenapi.VM_metrics.get_VCPUs_utilisation (self.session_metrics)
if len (cpus_util) == 0:
return 0
@ -331,10 +347,14 @@ class QubesVm(object):
if dry_run:
return "NA"
if self.session_uuid is None:
return "NA"
try:
power_state = xend_session.session.xenapi.VM.get_power_state (self.session_uuid)
except XenAPI.Failure:
self.refresh_xend_session()
if self.session_uuid is None:
return "NA"
power_state = xend_session.session.xenapi.VM.get_power_state (self.session_uuid)
power_state = xend_session.session.xenapi.VM.get_power_state (self.session_uuid)
return power_state
def is_running(self):
@ -343,7 +363,6 @@ class QubesVm(object):
else:
return False
def get_disk_usage(self, file_or_dir):
if not os.path.exists(file_or_dir):
return 0
@ -442,7 +461,12 @@ class QubesVm(object):
if dom0_mem_new < dom0_min_memory:
raise MemoryError ("ERROR: starting this VM would cause Dom0 memory to go below {0}B".format(dom0_min_memory))
xend_session.session.xenapi.VM.start (self.session_uuid, True) # Starting a VM paused
try:
xend_session.session.xenapi.VM.start (self.session_uuid, True) # Starting a VM paused
except XenAPI.Failure:
self.refresh_xend_session()
xend_session.session.xenapi.VM.start (self.session_uuid, True) # Starting a VM paused
xid = int (xend_session.session.xenapi.VM.get_domid (self.session_uuid))
if verbose:
@ -487,7 +511,11 @@ class QubesVm(object):
if dry_run:
return
xend_session.session.xenapi.VM.hard_shutdown (self.session_uuid)
try:
xend_session.session.xenapi.VM.hard_shutdown (self.session_uuid)
except XenAPI.Failure:
self.refresh_xend_session()
xend_session.session.xenapi.VM.hard_shutdown (self.session_uuid)
def remove_from_disk(self):
if dry_run: