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/commands/command -a "/bin/sleep 3"
#    test-module -m ../library/system/service -a "name=httpd ensure=restarted"
#    test-module -m ../library/system/service -a "name=httpd ensure=restarted" --debugger /usr/bin/pdb
#    test-module -m ../library/file/lineinfile -a "dest=/etc/exports line='/srv/home hostname1(rw,sync)'" --check
#    test-module -m ../library/commands/command -a "echo hello" -n -o "test_hello"

import sys
import base64
import os
import subprocess
import traceback
import optparse
import ansible.utils.vars as utils_vars
from ansible.parsing import DataLoader
from ansible.parsing.utils.jsonify import jsonify
from ansible.parsing.splitter import parse_kv
import ansible.executor.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)")
    parser.add_option('-I', '--interpreter', dest='interpreter',
        help="path to interpreter to use for this module (e.g. ansible_python_interpreter=/usr/bin/python)",
        metavar='INTERPRETER_TYPE=INTERPRETER_PATH',
        default='python={}'.format(sys.executable))
    parser.add_option('-c', '--check', dest='check', action='store_true',
        help="run the module in check mode")
    parser.add_option('-n', '--noexecute', dest='execute', action='store_false',
        default=True, help="do not run the resulting module")
    parser.add_option('-o', '--output', dest='filename',
        help="Filename for resulting module",
        default="~/.ansible_module_generated")
    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 = parse_kv(argstring)
        argstring = jsonify(args)
    argsfile.write(argstring)
    argsfile.close()
    return argspath

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

    #module_fh = open(modfile)
    #module_data = module_fh.read()
    #module_fh.close()

    #replacer = module_common.ModuleReplacer()
    loader = DataLoader()

    #included_boilerplate = module_data.find(module_common.REPLACER) != -1 or module_data.find("import ansible.module_utils") != -1

    complex_args = {}
    if args.startswith("@"):
        # Argument is a YAML file (JSON is a subset of YAML)
        complex_args = utils_vars.combine_vars(complex_args, loader.load_from_file(args[1:]))
        args=''
    elif args.startswith("{"):
        # Argument is a YAML document (not a file)
        complex_args = utils_vars.combine_vars(complex_args, loader.load(args))
        args=''

    if args:
        parsed_args = parse_kv(args)
        complex_args = utils_vars.combine_vars(complex_args, parsed_args)

    task_vars = {}
    if interpreter:
        if '=' not in interpreter:
            print 'interpreter must by in the form of ansible_python_interpreter=/usr/bin/python'
            sys.exit(1)
        interpreter_type, interpreter_path = interpreter.split('=')
        if not interpreter_type.startswith('ansible_'):
            interpreter_type = 'ansible_%s' % interpreter_type
        if not interpreter_type.endswith('_interpreter'):
            interpreter_type = '%s_interpreter' % interpreter_type
        task_vars[interpreter_type] = interpreter_path

    if check:
         complex_args['CHECKMODE'] = True

    (module_data, module_style, shebang) = module_common.modify_module(
        modfile,
        complex_args,
        task_vars=task_vars
    )

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

    return (modfile2_path, module_style)

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 = json.loads(out)
    except:
        print "***********************************"
        print "INVALID OUTPUT FORMAT"
        print out
        traceback.print_exc()
        sys.exit(1)

    print "***********************************"
    print "PARSED OUTPUT"
    print 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, module_style) = boilerplate_module(options.module_path, options.module_args, options.interpreter, options.check, options.filename)

    argspath = None
    if module_style != 'new':
        if module_style == 'non_native_want_json':
            argspath = write_argsfile(options.module_args, json=True)
        elif module_style == 'old':
            argspath = write_argsfile(options.module_args, json=False)
        else:
            raise Exception("internal error, unexpected module style: %s" % module_style)
    if options.execute:
        if options.debugger:
            rundebug(options.debugger, modfile, argspath)
        else:
            runtest(modfile, argspath)
        
if __name__ == "__main__":
    main()