def write(self, text):
# Generate a name for the temp file
tmpname = os.path.join( properties.TEMP_DIR, '__TMP__XML__' ) \
+ str( randrange( 0, 999999999, 1) )
# Validate the XML by copying it to a temporary file and checking it
# with parse_xml..
tmpfile = open(tmpname, 'w+')
invalid_xml = 1
try:
tmpfile.write(text)
tmpfile.flush()
parse_xml(tmpname)
invalid_xml = 0
finally:
# Try really hard to discard the temporary file.
try:
tmpfile.close()
except:
msglog.exception()
try:
os.unlink(tmpname)
except:
msglog.exception()
if invalid_xml:
raise EInvalidXML
# If we get here, at 'looks' like a valid configuration.
# OK, here comes the scary bit.
# Try to save old configuration.
old_config_name = None
config_file_full = properties.CONFIGURATION_FILE
paths = config_file_full.split('/')
config_file = paths[-1]
config_path = config_file_full[0:-len(config_file)]
if os.path.exists(config_path):
if os.path.exists(config_file_full):
old_config_name = os.path.join(config_path, 'broadway_old.xml')
os.rename(config_file_full, old_config_name)
else:
# The config path does not exist, try to create it.
os.makedirs(config_path)
all_ok = 0
try:
newfile = open(config_file_full, 'w+')
newfile.write(text)
newfile.close()
all_ok = 1
finally:
# I use a finally block so a meaningful exception is raised.
if not all_ok and old_config_name:
os.rename(old_config_name, config_file_full)
def write(self, text):
# Generate a name for the temp file
tmpname = os.path.join( properties.TEMP_DIR, '__TMP__XML__' ) \
+ str( randrange( 0, 999999999, 1) )
# Validate the XML by copying it to a temporary file and checking it
# with parse_xml..
tmpfile = open(tmpname,'w+')
invalid_xml = 1
try:
tmpfile.write(text)
tmpfile.flush()
parse_xml(tmpname)
invalid_xml = 0
finally:
# Try really hard to discard the temporary file.
try: tmpfile.close()
except: msglog.exception()
try: os.unlink(tmpname)
except: msglog.exception()
if invalid_xml:
raise EInvalidXML
# If we get here, at 'looks' like a valid configuration.
# OK, here comes the scary bit.
# Try to save old configuration.
old_config_name = None
config_file_full = properties.CONFIGURATION_FILE
paths = config_file_full.split('/')
config_file = paths[-1]
config_path = config_file_full[0:-len(config_file)]
if os.path.exists(config_path):
if os.path.exists(config_file_full):
old_config_name = os.path.join(config_path, 'broadway_old.xml')
os.rename(config_file_full, old_config_name)
else:
# The config path does not exist, try to create it.
os.makedirs(config_path)
all_ok = 0
try:
newfile = open(config_file_full, 'w+')
newfile.write(text)
newfile.close()
all_ok = 1
finally:
# I use a finally block so a meaningful exception is raised.
if not all_ok and old_config_name:
os.rename(old_config_name, config_file_full)
def load_xml(parent, path):
legal_controlling_authority = parent.as_node_url()
msglog.log(legal_controlling_authority, msglog.types.INFO,
'Stage 1: Parsing configuration file: %s' % (path, ))
root = parse_xml(
path
) #this would be a replacement rznet_peer node but we will throw it away
return load_root(root, parent)
def loads(self, data):
datastream = StringIO.StringIO(data)
xmlroot = parse_xml(datastream)
xmlroot.parent = self.node.url
crawler = Iterator(xmlroot)
nodecount = 0
while crawler.has_more():
xmlnode = crawler.get_next_node()
config = xmlnode.get_config()
print 'Loading node %d: %s' % (nodecount, config)
node = load_node(config)
node.configure(config)
nodecount += 1
return nodecount
def loads(self, data):
datastream = StringIO.StringIO(data)
xmlroot = parse_xml(datastream)
xmlroot.parent = self.node.url
crawler = Iterator(xmlroot)
nodecount = 0
while crawler.has_more():
xmlnode = crawler.get_next_node()
config = xmlnode.get_config()
print 'Loading node %d: %s' % (nodecount, config)
node = load_node(config)
node.configure(config)
nodecount += 1
return nodecount
def _configure_file(filename, faillist):
msglog.log('broadway',msglog.types.INFO,
'Stage 1: Parsing configuration file.')
root = parse_xml(filename)
# configure the root node.
msglog.log('broadway',msglog.types.INFO,
'Stage 2: Configuring the root node.')
node = mpx.lib.node.from_path(root.get_url())
node.configure(root.get_config())
anchors = []
# Sort the namespace anchors according to their priority.
for a in root.children:
anchors.append(a)
anchors.sort(_priority_sort)
msglog.log('broadway',msglog.types.INFO,
'Stage 3: Configuring anchors.')
n = 0
for a in anchors:
n += 1
msglog.log('broadway',msglog.types.INFO,
"Stage 3.%d: Configuring %r." % (n, a.get_url()))
ai = Iterator(a)
# The while, try, while construct minimizes constructing try/except
# blocks which is an expensive operation.
while ai is not None and ai.has_more():
config = a
state = 'none'
try:
while ai.has_more():
previous_config = config
state = 'lookup'
config = ai.get_next_node()
state = 'decode'
cd = config.get_config()
cd['name'] = cd['name'].strip()
state = 'load'
node = _load(cd)
state = 'configure'
node.configure(cd)
state = 'next'
except Exception, e:
# @fixme Add children, partial configure (name and parent).
msg = ''
if state == 'lookup':
msg = '%s%r%s' % (
'Internal failure fetching the node after ',
previous_config.get_url(),
' in the configuration. Aborting configuration.')
# We're toast, give up.
ai = None
elif state == 'decode':
msg = (
'Internal failure decoding %r\'s configuration data.' %
config.get_url()
)
elif state == 'load':
msg = 'Failed to create node described by %r' % cd
faillist.append({'name':cd['name'],'parent':cd['parent'],
'type':'load'})
elif state == 'configure':
msg = 'Failed to configure node %r with %r' % (
(config.get_url(), cd))
faillist.append({'name':cd['name'],'parent':cd['parent'],
'type':'config'})
else:
msg = 'Internal failure in %r state' % state
msglog.log('broadway', msglog.types.ERR, msg)
msglog.exception(msglog.types.ERR)
if ai is not None:
ai.remove_children()
msglog.log('broadway', msglog.types.WARN,
'Unable to create/configure node %s, %s' %
(config.get_url(), 'skipping children'))
def load_xml(parent, path):
legal_controlling_authority = parent.as_node_url()
msglog.log(legal_controlling_authority,msglog.types.INFO,
'Stage 1: Parsing configuration file: %s' % (path,))
root = parse_xml(path) #this would be a replacement rznet_peer node but we will throw it away
return load_root(root, parent)
def check_and_load_application_files(self, starting=0):
app_reloaded = starting #return value to signal that the children need to be started
save_pdo = 0 #flag to control saving config data to pdo
files = os.listdir(
config_path) #/var/mpx/config/services/control (usually)
xml_filenames = []
for f in files:
if f.find('.xml') > 0 and len(f) == (
f.find('.xml') + 4
): #any xml file in this folder is assumed to be a control app
xml_filenames.append(f)
modify_time = os.stat(config_path + f)[8]
stale_pdo = True
no_stats_pdo = True
if f in self._pdo.stats_dict: #check for change since last time
no_stats_pdo = False
if self._pdo.stats_dict[f][0] == modify_time:
stale_pdo = False #old news, no change detected
#self.stats_dict[f]=modify_time
if starting or no_stats_pdo or (
stale_pdo
and ALLOW_APP_RELOAD): #need to (re)load application
if app_reloaded == 0: #only stop all application nodes for the first detected change
try:
self._status = 'Stopping %s' % (f, )
msglog.log(
self.as_node_url(), msglog.types.INFO,
'Stage 0: Stop Application templates.')
for c in self.children_nodes():
if hasattr(c, '_stop_running_app'):
c._stop_running_app()
except:
msglog.exception()
app_reloaded = 1 #no need to "stop" for any other app changes
self._status = 'Loading %s' % (f, )
try:
root = None
if not stale_pdo: #so no change was detected, we are starting up the framework
try: #to get the pickled config data rather than load the xml again
msglog.log(
self.as_node_url(), msglog.types.INFO,
'Stage 1: XML unchanged. Loading configuration data from PDO: %s'
% (f, ))
root = cPickle.loads(
self._pdo.stats_dict[f][1])
except:
msglog.exception()
msglog.log(
self.as_node_url(), msglog.types.WARN,
'Stage 1: Unable to reload config data. Next, try XML file.'
)
if root is None:
msglog.log(
self.as_node_url(), msglog.types.INFO,
'Stage 1: Parsing configuration xml file: %s'
% (f, ))
root = parse_xml(config_path + f)
self._pdo.stats_dict[f] = (modify_time,
cPickle.dumps(root))
save_pdo = 1
if f in self._stale_apps:
self._stale_apps.remove(f)
#now we have the root configuration. Turn it into configured nodes
module = root.get_config().get('module', None)
if module == 'mpx.ion.rz.rzhost_node.RzhostNode':
load_rz_root(root, self)
elif module == 'mpx.service.control.graphical.ApplicationNode':
load_tim_root(root, self)
else:
raise EInvalidValue()
except Exception, e:
msglog.exception()
pass
elif stale_pdo:
if not f in self._stale_apps:
msglog.log(
self.as_node_url(), msglog.types.INFO,
'Application %s has been modified, please restart the framework.'
% (f, ))
self._stale_apps.append(f)
try:
self.get_child(f.split('.')[0]).set_stale_flag()
except:
msglog.exception()
def check_and_load_application_files(self, starting=0):
app_reloaded = starting #return value to signal that the children need to be started
save_pdo = 0 #flag to control saving config data to pdo
files = os.listdir(config_path) #/var/mpx/config/services/control (usually)
xml_filenames = []
for f in files:
if f.find('.xml') > 0 and len(f) == (f.find('.xml') + 4): #any xml file in this folder is assumed to be a control app
xml_filenames.append(f)
modify_time = os.stat(config_path + f)[8]
stale_pdo = True
no_stats_pdo = True
if f in self._pdo.stats_dict: #check for change since last time
no_stats_pdo = False
if self._pdo.stats_dict[f][0] == modify_time:
stale_pdo = False #old news, no change detected
#self.stats_dict[f]=modify_time
if starting or no_stats_pdo or (stale_pdo and ALLOW_APP_RELOAD): #need to (re)load application
if app_reloaded == 0: #only stop all application nodes for the first detected change
try:
self._status = 'Stopping %s' % (f,)
msglog.log(self.as_node_url(),msglog.types.INFO,
'Stage 0: Stop Application templates.')
for c in self.children_nodes():
if hasattr(c, '_stop_running_app'):
c._stop_running_app()
except:
msglog.exception()
app_reloaded = 1 #no need to "stop" for any other app changes
self._status = 'Loading %s' % (f,)
try:
root = None
if not stale_pdo: #so no change was detected, we are starting up the framework
try: #to get the pickled config data rather than load the xml again
msglog.log(self.as_node_url(),msglog.types.INFO,
'Stage 1: XML unchanged. Loading configuration data from PDO: %s' % (f,))
root = cPickle.loads(self._pdo.stats_dict[f][1])
except:
msglog.exception()
msglog.log(self.as_node_url(),msglog.types.WARN,
'Stage 1: Unable to reload config data. Next, try XML file.')
if root is None:
msglog.log(self.as_node_url(),msglog.types.INFO,
'Stage 1: Parsing configuration xml file: %s' % (f,))
root = parse_xml(config_path + f)
self._pdo.stats_dict[f] = (modify_time, cPickle.dumps(root))
save_pdo = 1
if f in self._stale_apps:
self._stale_apps.remove(f)
#now we have the root configuration. Turn it into configured nodes
module = root.get_config().get('module', None)
if module == 'mpx.ion.rz.rzhost_node.RzhostNode':
load_rz_root(root, self)
elif module == 'mpx.service.control.graphical.ApplicationNode':
load_tim_root(root, self)
else:
raise EInvalidValue()
except Exception, e:
msglog.exception()
pass
elif stale_pdo:
if not f in self._stale_apps:
msglog.log(self.as_node_url(), msglog.types.INFO,
'Application %s has been modified, please restart the framework.' % (f,))
self._stale_apps.append(f)
try:
self.get_child(f.split('.')[0]).set_stale_flag()
except:
msglog.exception()
