/usr/share/pyshared/crm/cibstatus.py is in pacemaker 1.1.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This software is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
import sys
import os
import re
import time
from singletonmixin import Singleton
from vars import Vars
from xmlutil import *
from msg import *
def get_tag_by_id(node,tag,id):
"Find a doc node which matches tag and id."
for n in node.getElementsByTagName(tag):
if n.getAttribute("id") == id:
return n
return None
def get_status_node_id(n):
try: n = n.parentNode
except: return None
if n.tagName != "node_state":
return get_status_node_id(n)
return n.getAttribute("id")
def get_status_node(status_node,node):
for n in status_node.childNodes:
if not is_element(n) or n.tagName != "node_state":
continue
if n.getAttribute("id") == node:
return n
return None
def get_status_ops(status_node,rsc,op,interval,node = ''):
'''
Find a doc node which matches the operation. interval set to
"-1" means to lookup an operation with non-zero interval (for
monitors). Empty interval means any interval is fine.
'''
l = []
for n in status_node.childNodes:
if not is_element(n) or n.tagName != "node_state":
continue
if node and n.getAttribute("id") != node:
continue
for r in n.getElementsByTagName("lrm_resource"):
if r.getAttribute("id") != rsc:
continue
for o in r.getElementsByTagName("lrm_rsc_op"):
if o.getAttribute("operation") != op:
continue
if o.getAttribute("interval") == interval or \
(interval == "-1" and o.getAttribute("interval") != "0"):
l.append(o)
return l
def split_op(op):
if op == "probe":
return "monitor","0"
elif op == "monitor":
return "monitor","-1"
elif op[0:8] == "monitor:":
return "monitor",op[8:]
return op,"0"
def cib_path(source):
return source[0:7] == "shadow:" and shadowfile(source[7:]) or source
class CibStatus(Singleton):
'''
CIB status management
'''
cmd_inject = "</dev/null >/dev/null 2>&1 crm_simulate -x %s -I %s"
cmd_run = "2>&1 crm_simulate -R -x %s"
cmd_simulate = "2>&1 crm_simulate -S -x %s"
node_ops = {
"online": "-u",
"offline": "-d",
"unclean": "-f",
}
def __init__(self):
self.origin = "live"
self.backing_file = "" # file to keep the live cib
self.status_node = None
self.doc = None
self.cib = None
self.reset_state()
def _cib_path(self,source):
if source[0:7] == "shadow:":
return shadowfile(source[7:])
else:
return source
def _load_cib(self,source):
if source == "live":
if not self.backing_file:
self.backing_file = cib2tmp()
if not self.backing_file:
return None,None
else:
cibdump2file(self.backing_file)
f = self.backing_file
else:
f = cib_path(source)
return read_cib(file2doc,f)
def _load(self,source):
doc,cib = self._load_cib(source)
if not doc:
return False
status = get_conf_elem(doc, "status")
if not status:
return False
self.doc,self.cib = doc,cib
self.status_node = status
self.reset_state()
return True
def reset_state(self):
self.modified = False
self.quorum = ''
self.node_changes = {}
self.op_changes = {}
return True
def source_file(self):
if self.origin == "live":
return self.backing_file
else:
return cib_path(self.origin)
def status_node_list(self):
if not self.get_status():
return
return [x.getAttribute("id") for x in self.doc.getElementsByTagName("node_state")]
def status_rsc_list(self):
if not self.get_status():
return
rsc_list = [x.getAttribute("id") for x in self.doc.getElementsByTagName("lrm_resource")]
# how to uniq?
d = {}
for e in rsc_list:
d[e] = 0
return d.keys()
def load(self,source):
'''
Load the status section from the given source. The source
may be cluster ("live"), shadow CIB, or CIB in a file.
'''
if self.backing_file:
os.unlink(self.backing_file)
self.backing_file = ""
if not self._load(source):
common_err("the cib contains no status")
return False
self.origin = source
return True
def save(self,dest = None):
'''
Save the modified status section to a file/shadow. If the
file exists, then it must be a cib file and the status
section is replaced with our status section. If the file
doesn't exist, then our section and some (?) configuration
is saved.
'''
if not self.modified:
common_info("apparently you didn't modify status")
return False
if (not dest and self.origin == "live") or dest == "live":
common_warn("cannot save status to the cluster")
return False
doc,cib = self.doc,self.cib
if dest:
dest_path = cib_path(dest)
if os.path.isfile(dest_path):
doc,cib = self._load_cib(dest)
if not doc or not cib:
common_err("%s exists, but no cib inside" % dest)
return False
else:
dest_path = cib_path(self.origin)
if doc != self.doc:
status = get_conf_elem(doc, "status")
rmnode(status)
cib.appendChild(doc.importNode(self.status_node,1))
xml = doc.toprettyxml(user_prefs.xmlindent)
try: f = open(dest_path,"w")
except IOError, msg:
common_err(msg)
return False
f.write(xml)
f.close()
return True
def _crm_simulate(self, cmd, nograph, scores, utilization, verbosity):
if verbosity:
cmd = "%s -%s" % (cmd,verbosity.upper())
if scores:
cmd = "%s -s" % cmd
if utilization:
cmd = "%s -U" % cmd
if user_prefs.dotty and not nograph:
fd,dotfile = mkstemp()
cmd = "%s -D %s" % (cmd,dotfile)
else:
dotfile = None
rc = ext_cmd(cmd % self.source_file())
if dotfile:
show_dot_graph(dotfile)
vars.tmpfiles.append(dotfile)
return rc == 0
# actions is ignored
def run(self, nograph, scores, utilization, actions, verbosity):
return self._crm_simulate(self.cmd_run, \
nograph, scores, utilization, verbosity)
# actions is ignored
def simulate(self, nograph, scores, utilization, actions, verbosity):
return self._crm_simulate(self.cmd_simulate, \
nograph, scores, utilization, verbosity)
def get_status(self):
'''
Return the status section node.
'''
if (not self.status_node or \
(self.origin == "live" and not self.modified)) \
and not self._load(self.origin):
return None
return self.status_node
def list_changes(self):
'''
Dump a set of changes done.
'''
if not self.modified:
return True
for node in self.node_changes:
print node,self.node_changes[node]
for op in self.op_changes:
print op,self.op_changes[op]
if self.quorum:
print "quorum:",self.quorum
return True
def show(self):
'''
Page the "pretty" XML of the status section.
'''
if not self.get_status():
return False
page_string(self.status_node.toprettyxml(user_prefs.xmlindent))
return True
def inject(self,opts):
return ext_cmd("%s %s" % \
(self.cmd_inject % (self.source_file(), self.source_file()), opts))
def set_quorum(self, v):
rc = self.inject("--quorum=%s" % (v and "true" or "false"))
if rc != 0:
return False
self._load(self.origin)
self.quorum = v and "true" or "false"
self.modified = True
return True
def edit_node(self,node,state):
'''
Modify crmd, expected, and join attributes of node_state
to set the node's state to online, offline, or unclean.
'''
if not self.get_status():
return False
if not state in self.node_ops:
common_err("unknown state %s" % state)
return False
node_node = get_tag_by_id(self.status_node,"node_state",node)
if not node_node:
common_info("node %s created" % node)
return False
rc = self.inject("%s %s" % (self.node_ops[state], node))
if rc != 0:
return False
self._load(self.origin)
self.node_changes[node] = state
self.modified = True
return True
def edit_op(self,op,rsc,rc_code,op_status,node = ''):
'''
Set rc-code and op-status in the lrm_rsc_op status
section element.
'''
if not self.get_status():
return False
l_op,l_int = split_op(op)
op_nodes = get_status_ops(self.status_node,rsc,l_op,l_int,node)
if l_int == "-1" and len(op_nodes) != 1:
common_err("need interval for the monitor op")
return False
if node == '' and len(op_nodes) != 1:
if op_nodes:
nodelist = [get_status_node_id(x) for x in op_nodes]
common_err("operation %s found at %s" % (op,' '.join(nodelist)))
else:
common_err("operation %s not found" % op)
return False
# either the op is fully specified (maybe not found)
# or we found exactly one op_node
if len(op_nodes) == 1:
op_node = op_nodes[0]
if not node:
node = get_status_node_id(op_node)
if not node:
common_err("node not found for the operation %s" % op)
return False
if l_int == "-1":
l_int = op_node.getAttribute("interval")
op_op = op_status == "0" and "-i" or "-F"
rc = self.inject("%s %s_%s_%s@%s=%s" % \
(op_op, rsc, l_op, l_int, node, rc_code))
if rc != 0:
return False
self.op_changes[node+":"+rsc+":"+op] = "rc="+rc_code
if op_status:
self.op_changes[node+":"+rsc+":"+op] += "," "op-status="+op_status
self._load(self.origin)
self.modified = True
return True
vars = Vars.getInstance()
# vim:ts=4:sw=4:et:
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