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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] Implement the major part of the new error handling for the Xen-API.
# HG changeset patch
# User Ewan Mellor <ewan@xxxxxxxxxxxxx>
# Date 1166714185 0
# Node ID c3d84afbbb47a4871aa2f4e9262ab1e18d6c8c36
# Parent 38213c2544d769ccc3fc6ad2fe432a65ea61de36
Implement the major part of the new error handling for the Xen-API.
Signed-off-by: Ewan Mellor <ewan@xxxxxxxxxxxxx>
---
tools/python/xen/xend/XendAPI.py | 175 ++++++++++++++++++++----------
tools/python/xen/xend/XendAuthSessions.py | 13 --
2 files changed, 117 insertions(+), 71 deletions(-)
diff -r 38213c2544d7 -r c3d84afbbb47 tools/python/xen/xend/XendAPI.py
--- a/tools/python/xen/xend/XendAPI.py Thu Dec 21 13:12:09 2006 +0000
+++ b/tools/python/xen/xend/XendAPI.py Thu Dec 21 15:16:25 2006 +0000
@@ -15,11 +15,12 @@
# Copyright (C) 2006 XenSource Ltd.
#============================================================================
+import re
+
from xen.xend import XendDomain, XendDomainInfo, XendNode
from xen.xend import XendLogging
from xen.xend.XendAuthSessions import instance as auth_manager
-from xen.xend.XendAuthSessions import session_required
from xen.xend.XendError import *
from xen.xend.XendClient import ERROR_INVALID_DOMAIN
from xen.xend.XendLogging import log
@@ -44,7 +45,16 @@ def xen_api_success_void():
def xen_api_error(error):
"""Wraps an error value in XenAPI format."""
- return {"Status": "Error", "ErrorDescription": error}
+ if type(error) == tuple:
+ error = list(error)
+ if type(error) != list:
+ error = [error]
+ if len(error) == 0:
+ error = ['INTERNAL_ERROR', 'Empty list given to xen_api_error']
+
+ return { "Status": "Error",
+ "ErrorDescription": [str(x) for x in error] }
+
def xen_api_todo():
"""Temporary method to make sure we track down all the TODOs"""
@@ -68,6 +78,56 @@ def trace(func, api_name = ''):
trace_func.api = api_name
return trace_func
+
+takesRE = re.compile(r'^(.*)\(\) takes exactly ([0-9]*) argument')
+def deconstruct_typeerror(exn):
+ m = takesRE.search(exn[0])
+ return m and m.groups() or None
+
+
+def catch_typeerror(func):
+ """Decorator to catch any TypeErrors and translate them into Xen-API
+ errors.
+
+ @param func: function with params: (self, session, host_ref)
+ @rtype: callable object
+ """
+ def f(self, *args, **kwargs):
+ try:
+ return func(self, *args, **kwargs)
+ except TypeError, exn:
+ if hasattr(func, 'api'):
+ mt = deconstruct_typeerror(exn)
+ if mt:
+ method, takes = mt
+ if method.endswith(func.api.split('.')[-1]):
+ return xen_api_error(
+ ['MESSAGE_PARAMETER_COUNT_MISMATCH',
+ func.api, int(takes) - 2,
+ len(args) + len(kwargs) - 1])
+ raise
+
+ # make sure we keep the 'api' attribute
+ if hasattr(func, 'api'):
+ f.api = func.api
+
+ return f
+
+
+def session_required(func):
+ def check_session(self, session, *args, **kwargs):
+ if auth_manager().is_session_valid(session):
+ return func(self, session, *args, **kwargs)
+ else:
+ return xen_api_error(['SESSION_INVALID', session])
+
+ # make sure we keep the 'api' attribute
+ if hasattr(func, 'api'):
+ check_session.api = func.api
+
+ return check_session
+
+
def valid_host(func):
"""Decorator to verify if host_ref is valid before calling
method.
@@ -80,8 +140,7 @@ def valid_host(func):
if type(host_ref) == type(str()) and xennode.is_valid_host(host_ref):
return func(self, session, host_ref, *args, **kwargs)
else:
- return {'Status': 'Failure',
- 'ErrorDescription': XEND_ERROR_HOST_INVALID}
+ return xen_api_error(['HOST_HANDLE_INVALID', host_ref])
# make sure we keep the 'api' attribute
if hasattr(func, 'api'):
@@ -102,8 +161,7 @@ def valid_host_cpu(func):
xennode.is_valid_cpu(host_cpu_ref):
return func(self, session, host_cpu_ref, *args, **kwargs)
else:
- return {'Status': 'Failure',
- 'ErrorDescription': XEND_ERROR_HOST_CPU_INVALID}
+ return xen_api_error(['HOST_CPU_HANDLE_INVALID', host_cpu_ref])
# make sure we keep the 'api' attribute
if hasattr(func, 'api'):
@@ -120,8 +178,10 @@ def valid_vm(func):
"""
def check_vm_ref(self, session, *args, **kwargs):
if len(args) == 0:
- return {'Status': 'Failure',
- 'ErrorDescription': XEND_ERROR_VM_INVALID}
+ # This will trigger a TypeError, because there aren't enough
+ # arguments, which will be caught higher up and diagnosed.
+ func(self, session)
+ assert false
vm_ref = args[0]
xendom = XendDomain.instance()
@@ -129,8 +189,7 @@ def valid_vm(func):
xendom.is_valid_vm(vm_ref):
return func(self, session, *args, **kwargs)
else:
- return {'Status': 'Failure',
- 'ErrorDescription': XEND_ERROR_VM_INVALID}
+ return xen_api_error(['VM_HANDLE_INVALID', vm_ref])
# make sure we keep the 'api' attribute
if hasattr(func, 'api'):
@@ -151,8 +210,7 @@ def valid_vbd(func):
xendom.is_valid_dev('vbd', vbd_ref):
return func(self, session, vbd_ref, *args, **kwargs)
else:
- return {'Status': 'Failure',
- 'ErrorDescription': XEND_ERROR_VBD_INVALID}
+ return xen_api_error(['VBD_HANDLE_INVALID', vbd_ref])
# make sure we keep the 'api' attribute
if hasattr(func, 'api'):
@@ -173,8 +231,7 @@ def valid_vif(func):
xendom.is_valid_dev('vif', vif_ref):
return func(self, session, vif_ref, *args, **kwargs)
else:
- return {'Status': 'Failure',
- 'ErrorDescription': XEND_ERROR_VIF_INVALID}
+ return xen_api_error(['VIF_HANDLE_INVALID', vif_ref])
# make sure we keep the 'api' attribute
if hasattr(func, 'api'):
@@ -196,8 +253,7 @@ def valid_vdi(func):
xennode.get_sr().is_valid_vdi(vdi_ref):
return func(self, session, vdi_ref, *args, **kwargs)
else:
- return {'Status': 'Failure',
- 'ErrorDescription': XEND_ERROR_VDI_INVALID}
+ return xen_api_error(['VDI_HANDLE_INVALID', vdi_ref])
# make sure we keep the 'api' attribute
if hasattr(func, 'api'):
@@ -218,8 +274,7 @@ def valid_vtpm(func):
xendom.is_valid_dev('vtpm', vtpm_ref):
return func(self, session, vtpm_ref, *args, **kwargs)
else:
- return {'Status': 'Failure',
- 'ErrorDescription': XEND_ERROR_VTPM_INVALID}
+ return xen_api_error(['VTPM_HANDLE_INVALID', vtpm_ref])
# make sure we keep the 'api' attribute
if hasattr(func, 'api'):
@@ -240,8 +295,7 @@ def valid_sr(func):
xennode.get_sr().uuid == sr_ref:
return func(self, session, sr_ref, *args, **kwargs)
else:
- return {'Status': 'Failure',
- 'ErrorDescription': XEND_ERROR_SR_INVALID}
+ return xen_api_error(['SR_HANDLE_INVALID', sr_ref])
# make sure we keep the 'api' attribute
if hasattr(func, 'api'):
@@ -274,7 +328,7 @@ class XendAPI:
used via XMLRPCServer.
All methods that need a valid session are marked with
- a L{XendAuthManager.session_required} decorator that will
+ a L{session_required} decorator that will
transparently perform the required session authentication.
We need to support Python <2.4, so we use the old decorator syntax.
@@ -291,15 +345,15 @@ class XendAPI:
self.auth = auth
classes = {
- 'session': (session_required,),
- 'host': (valid_host, session_required),
- 'host_cpu': (valid_host_cpu, session_required),
- 'VM': (valid_vm, session_required),
- 'VBD': (valid_vbd, session_required),
- 'VIF': (valid_vif, session_required),
- 'VDI': (valid_vdi, session_required),
- 'VTPM':(valid_vtpm, session_required),
- 'SR': (valid_sr, session_required)}
+ 'session': (session_required, catch_typeerror),
+ 'host': (valid_host, session_required, catch_typeerror),
+ 'host_cpu': (valid_host_cpu, session_required, catch_typeerror),
+ 'VM': (valid_vm, session_required, catch_typeerror),
+ 'VBD': (valid_vbd, session_required, catch_typeerror),
+ 'VIF': (valid_vif, session_required, catch_typeerror),
+ 'VDI': (valid_vdi, session_required, catch_typeerror),
+ 'VTPM':(valid_vtpm, session_required, catch_typeerror),
+ 'SR': (valid_sr, session_required, catch_typeerror)}
# Cheat methods
# -------------
@@ -375,7 +429,7 @@ class XendAPI:
func_full_name = '%s_%s' % (cls, func_name)
try:
method = getattr(XendAPI, func_full_name)
- method = session_required(method)
+ method = catch_typeerror(session_required(method))
method.api = '%s.%s' % (cls, func_name)
setattr(XendAPI, func_full_name, method)
except AttributeError:
@@ -396,14 +450,20 @@ class XendAPI:
session_methods = ['logout']
# session_funcs = ['login_with_password']
- def session_login_with_password(self, username, password):
+ def session_login_with_password(self, *args):
+ if len(args) != 2:
+ return xen_api_error(
+ ['MESSAGE_PARAMETER_COUNT_MISMATCH',
+ 'session.login_with_password', 2, len(args)])
+ username = args[0]
+ password = args[1]
try:
session = (self.auth == AUTH_NONE and
auth_manager().login_unconditionally(username) or
auth_manager().login_with_password(username, password))
return xen_api_success(session)
except XendError, e:
- return xen_api_error(XEND_ERROR_AUTHENTICATION_FAILED)
+ return xen_api_error(['SESSION_AUTHENTICATION_FAILED'])
session_login_with_password.api = 'session.login_with_password'
@@ -425,7 +485,7 @@ class XendAPI:
user = auth_manager().get_user(session)
if user:
return xen_api_success(user)
- return xen_api_error(XEND_ERROR_SESSION_INVALID)
+ return xen_api_error(['SESSION_INVALID', session])
# Xen API: Class User
@@ -937,7 +997,7 @@ class XendAPI:
dom = xendom.domain_lookup_nr(label)
if dom:
return xen_api_success([dom.get_uuid()])
- return xen_api_error(XEND_ERROR_VM_INVALID)
+ return xen_api_success([])
def VM_create(self, session, vm_struct):
xendom = XendDomain.instance()
@@ -949,7 +1009,7 @@ class XendAPI:
xendom = XendDomain.instance()
xeninfo = xendom.get_vm_by_uuid(vm_ref)
if not xeninfo:
- return xen_api_error(XEND_ERROR_VM_INVALID)
+ return xen_api_error(['VM_HANDLE_INVALID', vm_ref])
record = {
'uuid': xeninfo.get_uuid(),
@@ -1051,10 +1111,10 @@ class XendAPI:
xendom = XendDomain.instance()
vm = xendom.get_vm_with_dev_uuid('vbd', vbd_ref)
if not vm:
- return xen_api_error(XEND_ERROR_VBD_INVALID)
+ return xen_api_error(['VBD_HANDLE_INVALID', vbd_ref])
cfg = vm.get_dev_xenapi_config('vbd', vbd_ref)
if not cfg:
- return xen_api_error(XEND_ERROR_VBD_INVALID)
+ return xen_api_error(['VBD_HANDLE_INVALID', vbd_ref])
valid_vbd_keys = self.VBD_attr_ro + self.VBD_attr_rw + \
self.Base_attr_ro + self.Base_attr_rw
@@ -1073,7 +1133,7 @@ class XendAPI:
def VBD_create(self, session, vbd_struct):
xendom = XendDomain.instance()
if not xendom.is_valid_vm(vbd_struct['VM']):
- return xen_api_error(XEND_ERROR_DOMAIN_INVALID)
+ return xen_api_error(['VM_HANDLE_INVALID', vbd_struct['VM']])
dom = xendom.get_vm_by_uuid(vbd_struct['VM'])
vbd_ref = ''
@@ -1087,7 +1147,7 @@ class XendAPI:
sr = XendNode.instance().get_sr()
vdi_image = sr.xen_api_get_by_uuid(vdi_ref)
if not vdi_image:
- return xen_api_error(XEND_ERROR_VDI_INVALID)
+ return xen_api_error(['VDI_HANDLE_INVALID', vdi_ref])
vdi_image = vdi_image.qcow_path
vbd_ref = dom.create_vbd_with_vdi(vbd_struct, vdi_image)
except XendError:
@@ -1137,10 +1197,10 @@ class XendAPI:
xendom = XendDomain.instance()
vm = xendom.get_vm_with_dev_uuid('vif', vif_ref)
if not vm:
- return xen_api_error(XEND_ERROR_VIF_INVALID)
+ return xen_api_error(['VIF_HANDLE_INVALID', vif_ref])
cfg = vm.get_dev_xenapi_config('vif', vif_ref)
if not cfg:
- return xen_api_error(XEND_ERROR_VIF_INVALID)
+ return xen_api_error(['VIF_HANDLE_INVALID', vif_ref])
valid_vif_keys = self.VIF_attr_ro + self.VIF_attr_rw + \
self.Base_attr_ro + self.Base_attr_rw
@@ -1164,7 +1224,7 @@ class XendAPI:
except XendError:
return xen_api_error(XEND_ERROR_TODO)
else:
- return xen_api_error(XEND_ERROR_DOMAIN_INVALID)
+ return xen_api_error(['VM_HANDLE_INVALID', vif_struct['VM']])
# Xen API: Class VDI
@@ -1295,14 +1355,14 @@ class XendAPI:
'read_only': image.read_only,
})
- return xen_api_error(XEND_ERROR_VDI_INVALID)
+ return xen_api_error(['VDI_HANDLE_INVALID', vdi_ref])
# Class Functions
def VDI_create(self, session, vdi_struct):
sr = XendNode.instance().get_sr()
sr_ref = vdi_struct['SR']
if sr.uuid != sr_ref:
- return xen_api_error(XEND_ERROR_SR_INVALID)
+ return xen_api_error(['SR_HANDLE_INVALID', vdi_struct['SR']])
vdi_uuid = sr.create_image(vdi_struct)
return xen_api_success(vdi_uuid)
@@ -1315,9 +1375,8 @@ class XendAPI:
sr = XendNode.instance().get_sr()
image_uuid = sr.xen_api_get_by_name_label(name)
if image_uuid:
- return xen_api_success(image_uuid)
-
- return xen_api_error(XEND_ERROR_VDI_INVALID)
+ return xen_api_success([image_uuid])
+ return xen_api_success([])
# Xen API: Class VTPM
@@ -1336,10 +1395,10 @@ class XendAPI:
xendom = XendDomain.instance()
vm = xendom.get_vm_with_dev_uuid('vtpm', vtpm_ref)
if not vm:
- return xen_api_error(XEND_ERROR_VTPM_INVALID)
+ return xen_api_error(['VTPM_HANDLE_INVALID', vtpm_ref])
cfg = vm.get_dev_xenapi_config('vtpm', vtpm_ref)
if not cfg:
- return xen_api_error(XEND_ERROR_VTPM_INVALID)
+ return xen_api_error(['VTPM_HANDLE_INVALID', vtpm_ref])
valid_vtpm_keys = self.VTPM_attr_ro + self.VTPM_attr_rw + \
self.Base_attr_ro + self.Base_attr_rw
for k in cfg.keys():
@@ -1353,10 +1412,10 @@ class XendAPI:
xendom = XendDomain.instance()
vm = xendom.get_vm_with_dev_uuid('vtpm', vtpm_ref)
if not vm:
- return xen_api_error(XEND_ERROR_VTPM_INVALID)
+ return xen_api_error(['VTPM_HANDLE_INVALID', vtpm_ref])
cfg = vm.get_dev_xenapi_config('vtpm', vtpm_ref)
if not cfg:
- return xen_api_error(XEND_ERROR_VTPM_INVALID)
+ return xen_api_error(['VTPM_HANDLE_INVALID', vtpm_ref])
if cfg.has_key('instance'):
instance = cfg['instance']
else:
@@ -1367,10 +1426,10 @@ class XendAPI:
xendom = XendDomain.instance()
vm = xendom.get_vm_with_dev_uuid('vtpm', vtpm_ref)
if not vm:
- return xen_api_error(XEND_ERROR_VTPM_INVALID)
+ return xen_api_error(['VTPM_HANDLE_INVALID', vtpm_ref])
cfg = vm.get_dev_xenapi_config('vtpm', vtpm_ref)
if not cfg:
- return xen_api_error(XEND_ERROR_VTPM_INVALID)
+ return xen_api_error(['VTPM_HANDLE_INVALID', vtpm_ref])
if cfg.has_key('type'):
driver = cfg['type']
else:
@@ -1381,10 +1440,10 @@ class XendAPI:
xendom = XendDomain.instance()
vm = xendom.get_vm_with_dev_uuid('vtpm', vtpm_ref)
if not vm:
- return xen_api_error(XEND_ERROR_VTPM_INVALID)
+ return xen_api_error(['VTPM_HANDLE_INVALID', vtpm_ref])
cfg = vm.get_dev_xenapi_config('vtpm', vtpm_ref)
if not cfg:
- return xen_api_error(XEND_ERROR_VTPM_INVALID)
+ return xen_api_error(['VTPM_HANDLE_INVALID', vtpm_ref])
if cfg.has_key('backend'):
backend = cfg['backend']
else:
@@ -1407,7 +1466,7 @@ class XendAPI:
except XendError:
return xen_api_error(XEND_ERROR_TODO)
else:
- return xen_api_error(XEND_ERROR_DOMAIN_INVALID)
+ return xen_api_error(['VM_HANDLE_INVALID', vtpm_struct['VM']])
# Xen API: Class SR
@@ -1439,7 +1498,7 @@ class XendAPI:
def SR_get_by_name_label(self, session, label):
sr = XendNode.instance().get_sr()
if sr.name_label != label:
- return xen_api_error(XEND_ERROR_SR_INVALID)
+ return xen_api_success([])
return xen_api_success([sr.uuid])
def SR_create(self, session):
diff -r 38213c2544d7 -r c3d84afbbb47 tools/python/xen/xend/XendAuthSessions.py
--- a/tools/python/xen/xend/XendAuthSessions.py Thu Dec 21 13:12:09 2006 +0000
+++ b/tools/python/xen/xend/XendAuthSessions.py Thu Dec 21 15:16:25 2006 +0000
@@ -130,16 +130,3 @@ def instance():
inst = XendAuthSessions()
inst.init()
return inst
-
-# Handy Authentication Decorators
-# -------------------------------
-def session_required(func):
- def check_session(self, session, *args, **kwargs):
- if instance().is_session_valid(session):
- return func(self, session, *args, **kwargs)
- else:
- return {'Status': 'Failure',
- 'ErrorDescription': XEND_ERROR_SESSION_INVALID}
- return check_session
-
-
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