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"""Cobalt component base."""
__revision__ = '$Revision$'
__all__ = ["Component", "exposed", "automatic", "run_component"]
import inspect
import os
import cPickle
import pydoc
import sys
import getopt
import logging
import time
import threading
import xmlrpclib
import Bcfg2.Logger
from Bcfg2.SSLServer import XMLRPCServer
def run_component (component_cls, argv=None, register=True, state_name=False,
cls_kwargs={}, extra_getopt='', time_out=10):
if argv is None:
argv = sys.argv
try:
(opts, arg) = getopt.getopt(argv[1:], 'C:D:d' + extra_getopt)
except getopt.GetoptError, e:
print >> sys.stderr, e
print >> sys.stderr, "Usage:"
print >> sys.stderr, "%s [-d] [-D pidfile] [-C config file]" % (os.path.basename(argv[0]))
sys.exit(1)
# default settings
daemon = False
pidfile = ""
level = logging.INFO
# get user input
for item in opts:
if item[0] == '-C':
#FIXME
cf = (item[1], )
elif item[0] == '-D':
daemon = True
pidfile_name = item[1]
elif item[0] == '-d':
level = logging.DEBUG
logging.getLogger().setLevel(level)
Bcfg2.Logger.log_to_stderr(logging.getLogger())
Bcfg2.Logger.setup_logging(component_cls.implementation, True, True)
if daemon:
child_pid = os.fork()
if child_pid != 0:
return
os.setsid()
child_pid = os.fork()
if child_pid != 0:
os._exit(0)
redirect_file = open("/dev/null", "w+")
os.dup2(redirect_file.fileno(), sys.__stdin__.fileno())
os.dup2(redirect_file.fileno(), sys.__stdout__.fileno())
os.dup2(redirect_file.fileno(), sys.__stderr__.fileno())
os.chdir(os.sep)
os.umask(0)
pidfile = open(pidfile_name or "/dev/null", "w")
print >> pidfile, os.getpid()
pidfile.close()
component = component_cls(**cls_kwargs)
location = ('', 6789)
keypath = '/etc/bcfg2.key'
certfile = '/etc/bcfg2.key'
server = XMLRPCServer(location, keyfile=keypath, certfile=keypath,
register=register, timeout=time_out)
server.register_instance(component)
try:
server.serve_forever()
finally:
server.server_close()
def exposed (func):
"""Mark a method to be exposed publically.
Examples:
class MyComponent (Component):
@expose
def my_method (self, param1, param2):
do_stuff()
class MyComponent (Component):
def my_method (self, param1, param2):
do_stuff()
my_method = expose(my_method)
"""
func.exposed = True
return func
def automatic (func, period=10):
"""Mark a method to be run periodically."""
func.automatic = True
func.automatic_period = period
func.automatic_ts = -1
return func
def locking (func):
"""Mark a function as being internally thread safe"""
func.locking = True
return func
def readonly (func):
"""Mark a function as read-only -- no data effects in component inst"""
func.readonly = True
return func
def query (func=None, **kwargs):
"""Mark a method to be marshalled as a query."""
def _query (func):
if kwargs.get("all_fields", True):
func.query_all_fields = True
func.query = True
return func
if func is not None:
return _query(func)
return _query
def marshal_query_result (items, specs=None):
if specs is not None:
fields = get_spec_fields(specs)
else:
fields = None
return [item.to_rx(fields) for item in items]
class Component (object):
"""Base component.
Intended to be served as an instance by Cobalt.Component.XMLRPCServer
>>> server = Cobalt.Component.XMLRPCServer(location, keyfile)
>>> component = Cobalt.Component.Component()
>>> server.serve_instance(component)
Class attributes:
name -- logical component name (e.g., "queue-manager", "process-manager")
implementation -- implementation identifier (e.g., "BlueGene/L", "BlueGene/P")
Methods:
save -- pickle the component to a file
do_tasks -- perform automatic tasks for the component
"""
name = "component"
implementation = "generic"
def __init__ (self, **kwargs):
"""Initialize a new component.
Keyword arguments:
statefile -- file in which to save state automatically
"""
self.statefile = kwargs.get("statefile", None)
self.logger = logging.getLogger("%s %s" % (self.implementation, self.name))
self.lock = threading.Lock()
def save (self, statefile=None):
"""Pickle the component.
Arguments:
statefile -- use this file, rather than component.statefile
"""
statefile = statefile or self.statefile
if statefile:
temp_statefile = statefile + ".temp"
data = cPickle.dumps(self)
try:
fd = file(temp_statefile, "wb")
fd.write(data)
fd.close()
except IOError, e:
self.logger.error("statefile failure : %s" % e)
return str(e)
else:
os.rename(temp_statefile, statefile)
return "state saved to file: %s" % statefile
save = exposed(save)
def do_tasks (self):
"""Perform automatic tasks for the component.
Automatic tasks are member callables with an attribute
automatic == True.
"""
for name, func in inspect.getmembers(self, callable):
if getattr(func, "automatic", False):
need_to_lock = not getattr(func, 'locking', False)
if (time.time() - func.automatic_ts) > \
func.automatic_period:
if need_to_lock:
self.lock.acquire()
try:
mt1 = time.time()
func()
except:
self.logger.error("Automatic method %s failed" \
% (name), exc_info=1)
finally:
mt2 = time.time()
if need_to_lock:
self.lock.release()
func.__dict__['automatic_ts'] = time.time()
def _resolve_exposed_method (self, method_name):
"""Resolve an exposed method.
Arguments:
method_name -- name of the method to resolve
"""
try:
func = getattr(self, method_name)
except AttributeError:
raise NoExposedMethod(method_name)
if not getattr(func, "exposed", False):
raise NoExposedMethod(method_name)
return func
def _dispatch (self, method, args, dispatch_dict):
"""Custom XML-RPC dispatcher for components.
method -- XML-RPC method name
args -- tuple of paramaters to method
"""
need_to_lock = True
if method in dispatch_dict:
method_func = dispatch_dict[method]
else:
try:
method_func = self._resolve_exposed_method(method)
except Exception, e:
if getattr(e, "log", True):
self.logger.error(e, exc_info=True)
raise xmlrpclib.Fault(getattr(e, "fault_code", 1), str(e))
if getattr(method_func, 'locking', False):
need_to_lock = False
if need_to_lock:
lock_start = time.time()
self.lock.acquire()
lock_done = time.time()
try:
method_start = time.time()
result = method_func(*args)
method_done = time.time()
except Exception, e:
if getattr(e, "log", True):
self.logger.error(e, exc_info=True)
raise xmlrpclib.Fault(getattr(e, "fault_code", 1), str(e))
finally:
if need_to_lock:
self.lock.release()
if getattr(method_func, "query", False):
if not getattr(method_func, "query_all_methods", False):
margs = args[:1]
else:
margs = []
result = marshal_query_result(result, *margs)
return result
@exposed
def listMethods (self):
"""Custom XML-RPC introspective method list."""
return [
name for name, func in inspect.getmembers(self, callable)
if getattr(func, "exposed", False)
]
@exposed
def methodHelp (self, method_name):
"""Custom XML-RPC introspective method help.
Arguments:
method_name -- name of method to get help on
"""
try:
func = self._resolve_exposed_method(method_name)
except NoExposedMethod:
return ""
return pydoc.getdoc(func)
def get_name (self):
"""The name of the component."""
return self.name
get_name = exposed(get_name)
def get_implementation (self):
"""The implementation of the component."""
return self.implementation
get_implementation = exposed(get_implementation)
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