ansible/hacking/test-module

#!/usr/bin/env python

# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
#
# This file is part of Ansible
#
# Ansible 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 3 of the License, or
# (at your option) any later version.
#
# Ansible 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 Ansible.  If not, see <http://www.gnu.org/licenses/>.
#

# this script is for testing modules without running through the
# entire guts of ansible, and is very helpful for when developing
# modules
#
# example:
#    test-module -m ../library/command -a "/bin/sleep 3"
#    test-module -m ../library/service -a "name=httpd ensure=restarted"
#    test-module -m ../library/service -a "name=httpd ensure=restarted" --debugger /usr/bin/pdb

import sys
import base64
import os
import subprocess
import traceback
import optparse
import ansible.utils as utils
import ansible.module_common as module_common
import ansible.constants as C

try:
    import json
except ImportError:
    import simplejson as json

def parse():
    """parse command line

    :return : (options, args)"""
    parser = optparse.OptionParser()

    parser.usage = "%prog -[options] (-h for help)"

    parser.add_option('-m', '--module-path', dest='module_path',
        help="REQUIRED: full path of module source to execute")
    parser.add_option('-a', '--args', dest='module_args', default="",
        help="module argument string")
    parser.add_option('-D', '--debugger', dest='debugger', 
        help="path to python debugger (e.g. /usr/bin/pdb)")
    options, args = parser.parse_args()
    if not options.module_path:
        parser.print_help()
        sys.exit(1)
    else:
        return options, args

def write_argsfile(argstring, json=False):
    """ Write args to a file for old-style module's use. """
    argspath = os.path.expanduser("~/.ansible_test_module_arguments")
    argsfile = open(argspath, 'w')
    if json:
        args = utils.parse_kv(argstring)
        argstring = utils.jsonify(args)
    argsfile.write(argstring)
    argsfile.close()
    return argspath

def boilerplate_module(modfile, args):
    """ simulate what ansible does with new style modules """

    module_fh = open(modfile)
    module_data = module_fh.read()
    included_boilerplate = module_data.find(module_common.REPLACER) != -1
    module_fh.close()

    if included_boilerplate:

        module_data = module_data.replace(module_common.REPLACER, module_common.MODULE_COMMON)
        encoded_args = repr(str(args))
        module_data = module_data.replace(module_common.REPLACER_ARGS, encoded_args)
        encoded_lang = repr(C.DEFAULT_MODULE_LANG)
        empty_complex = repr("{}")
        module_data = module_data.replace(module_common.REPLACER_LANG, encoded_lang)
        module_data = module_data.replace('syslog.LOG_USER', "syslog.%s" % C.DEFAULT_SYSLOG_FACILITY)
        module_data = module_data.replace(module_common.REPLACER_COMPLEX, empty_complex)

        modfile2_path = os.path.expanduser("~/.ansible_module_generated")
        print "* including generated source, if any, saving to: %s" % modfile2_path
        print "* this will offset any line numbers in tracebacks/debuggers!"
        modfile2 = open(modfile2_path, 'w')
        modfile2.write(module_data)
        modfile2.close()
        modfile = modfile2_path

        return (modfile2_path, included_boilerplate, False)
    else:

        old_style_but_json = False
        if 'WANT_JSON' in module_data:
           old_style_but_json = True

        print "* module boilerplate substitution not requested in module, line numbers will be unaltered"
        return (modfile, included_boilerplate, old_style_but_json)

def runtest( modfile, argspath):
    """Test run a module, piping it's output for reporting."""

    os.system("chmod +x %s" % modfile)

    invoke = "%s" % (modfile)
    if argspath is not None:     
        invoke = "%s %s" % (modfile, argspath)

    cmd = subprocess.Popen(invoke, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    (out, err) = cmd.communicate()

    try:
        print "***********************************"
        print "RAW OUTPUT"
        print out
        print err
        results = utils.parse_json(out)
    except:
        print "***********************************"
        print "INVALID OUTPUT FORMAT"
        print out
        traceback.print_exc()
        sys.exit(1)

    print "***********************************"
    print "PARSED OUTPUT"
    print utils.jsonify(results,format=True)

def rundebug(debugger, modfile, argspath):
    """Run interactively with console debugger."""

    if argspath is not None:
        subprocess.call("%s %s %s" % (debugger, modfile, argspath), shell=True)
    else:
        subprocess.call("%s %s" % (debugger, modfile), shell=True)

def main(): 

    options, args = parse()
    (modfile, is_new_style, old_style_but_json) = boilerplate_module(options.module_path, options.module_args)

    argspath=None
    if not is_new_style:
        if old_style_but_json:
            argspath = write_argsfile(options.module_args, json=True)
        else:
            argspath = write_argsfile(options.module_args, json=False)
    if options.debugger: 
        rundebug(options.debugger, modfile, argspath)
    else:
        runtest(modfile, argspath)
	
if __name__ == "__main__":
    main()