Here is an example of how a (working) prototype program could look like that's
using higher level bindings.
~~~~
#!/usr/bin/env python
import argparse
import sys
from pyosaf.saImm import eSaImmClassCategoryT
from pyosaf.utils.immoi import get_available_classes_in_imm, get_class_category
from pyosaf.utils.immoi.implementer import Applier
def is_config_class(class_name):
category = get_class_category(class_name)
return category.value == eSaImmClassCategoryT.SA_IMM_CLASS_CONFIG
def parse_class_names():
return args.classes
def print_mo(mo):
print " %s (%s)" % (mo.dn, mo.SaImmAttrClassName)
# Print attributes
for name in mo.attrs.keys():
print " %s: %s" % (name, mo.attrs[name][1])
print
def handle_apply(all_instances, to_update, to_create, to_delete):
print
print '-' * 10 + " Configuration changed " + '-' * 10
# Handle creates
print " Created objects"
for mo in to_create:
print_mo(mo)
# Handle deletes
print " Deleted objects"
for mo in to_delete:
print_mo(mo)
# Handle updates
print " Updated objects"
for mo in to_update:
print_mo(mo)
if __name__ == "__main__":
# Parse command line arguments
parser = argparse.ArgumentParser(
description='Listens to changes to objects of the given classes')
parser.add_argument('classes', type=str, nargs='*',
help='space-separated list of class names')
parser.add_argument('--all', help='listens to changes to all classes',
dest='all', action='store_const', const=all,
default=False)
args = parser.parse_args()
classes = args.classes
listen_to_all = args.all
# Exit if no classes are passed
if not listen_to_all and (not classes or classes == []):
print "ERROR: Must specify classes to listen to or '--all'"
sys.exit(1)
# Sort out which classes to listen to
all_available_classes = get_available_classes_in_imm()
classes_to_listen_to = []
if listen_to_all:
print "INFO: Listening to changes to all configuration classes"
classes_to_listen_to = [c for c in all_available_classes if
is_config_class(c)]
else:
# Validate classes
for class_name in classes:
if not class_name in all_available_classes:
print "WARNING: Ignoring %s. It does not exist in IMM" %
class_name
continue
elif not is_config_class(class_name):
print "WARNING: Ignoring runtime class %s" % class_name
continue
classes_to_listen_to.append(class_name)
print "INFO: Listening for changes in %s" % ", ".join(classes_to_listen_to)
echo_applier = Applier(on_apply=handle_apply,
class_names=classes_to_listen_to)
echo_applier.enter_dispatch_loop()
~~~~
---
** [tickets:#1406] pyosaf: Higher leve/pythonic bindings for the IMM OI API are
missing**
**Status:** assigned
**Milestone:** future
**Created:** Tue Jul 07, 2015 01:15 PM UTC by Johan Mårtensson
**Last Updated:** Fri Jul 10, 2015 08:36 AM UTC
**Owner:** Johan Mårtensson
For the IMM OM API there are higher level python bindings that make it much
easier to use compared with the 1-to-1 python bindings. There is for example an
InstanceIterator class that iterates through instances for a given class, Ccb
class for transactions and immom.get() to retrieve a single object.
The IMM OI API only has the 1-to-1 mappings. This makes it hard to write an OI
as all the wrapping of python types to C and back has to be done by each user.
OpenSAF should have an abstracted OI python mapping that hides the C
(un)marshalling and caching and re-construction of CCB operations.
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