ansible/hacking/test-module

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2013-02-01 23:11:38 +01:00
#!/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:
# ./hacking/test-module -m lib/ansible/modules/commands/command.py -a "/bin/sleep 3"
# ./hacking/test-module -m lib/ansible/modules/commands/command.py -a "/bin/sleep 3" --debugger /usr/bin/pdb
# ./hacking/test-module -m lib/ansible/modules/files/lineinfile.py -a "dest=/etc/exports line='/srv/home hostname1(rw,sync)'" --check
# ./hacking/test-module -m lib/ansible/modules/commands/command.py -a "echo hello" -n -o "test_hello"
import optparse
import os
import subprocess
import sys
import traceback
import shutil
from ansible.release import __version__
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import ansible.utils.vars as utils_vars
from ansible.parsing.dataloader 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
from ansible.module_utils._text import to_native, to_text
from ansible.template import Templar
import 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')
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 get_interpreters(interpreter):
result = dict()
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
result[interpreter_type] = interpreter_path
return result
def boilerplate_module(modfile, args, interpreters, 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()
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loader = DataLoader()
# included_boilerplate = module_data.find(module_common.REPLACER) != -1 or module_data.find("import ansible.module_utils") != -1
complex_args = {}
# default selinux fs list is pass in as _ansible_selinux_special_fs arg
complex_args['_ansible_selinux_special_fs'] = C.DEFAULT_SELINUX_SPECIAL_FS
complex_args['_ansible_tmpdir'] = C.DEFAULT_LOCAL_TMP
complex_args['_ansible_keep_remote_files'] = C.DEFAULT_KEEP_REMOTE_FILES
complex_args['_ansible_version'] = __version__
if args.startswith("@"):
# Argument is a YAML file (JSON is a subset of YAML)
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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)
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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 = interpreters
if check:
complex_args['_ansible_check_mode'] = True
Ziploader * Ziploader proof of concept (jimi-c) * Cleanups to proof of concept ziploader branch: * python3 compatible base64 encoding * zipfile compression (still need to enable toggling this off for systems without zlib support in python) * Allow non-wildcard imports (still need to make this recusrsive so that we can have module_utils code that imports other module_utils code.) * Better tracebacks: module filename is kept and module_utils directory is kept so that tracebacks show the real filenames that the errors appear in. * Make sure we import modules that are used into the module_utils files that they are used in. * Set ansible version in a more pythonic way for ziploader than we were doing in module replacer * Make it possible to set the module compression as an inventory var This may be necessary on systems where python has been compiled without zlib compression. * Refactoring of module_common code: * module replacer only replaces values that make sense for that type of file (example: don't attempt to replace python imports if we're in a powershell module). * Implement configurable shebang support for ziploader wrapper * Implement client-side constants (for SELINUX_SPECIAL_FS and SYSLOG) via environment variable. * Remove strip_comments param as we're never going to use it (ruins line numbering) * Don't repeat ourselves about detecting REPLACER * Add an easy way to debug * Port test-module to the ziploader-aware modify_module() * strip comments and blank lines from the wrapper so we send less over the wire. * Comments cleanup * Remember to output write the module line itself in powershell modules * for line in lines strips the newlines so we have to add them back in
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modname = os.path.basename(modfile)
modname = os.path.splitext(modname)[0]
(module_data, module_style, shebang) = module_common.modify_module(
Ziploader * Ziploader proof of concept (jimi-c) * Cleanups to proof of concept ziploader branch: * python3 compatible base64 encoding * zipfile compression (still need to enable toggling this off for systems without zlib support in python) * Allow non-wildcard imports (still need to make this recusrsive so that we can have module_utils code that imports other module_utils code.) * Better tracebacks: module filename is kept and module_utils directory is kept so that tracebacks show the real filenames that the errors appear in. * Make sure we import modules that are used into the module_utils files that they are used in. * Set ansible version in a more pythonic way for ziploader than we were doing in module replacer * Make it possible to set the module compression as an inventory var This may be necessary on systems where python has been compiled without zlib compression. * Refactoring of module_common code: * module replacer only replaces values that make sense for that type of file (example: don't attempt to replace python imports if we're in a powershell module). * Implement configurable shebang support for ziploader wrapper * Implement client-side constants (for SELINUX_SPECIAL_FS and SYSLOG) via environment variable. * Remove strip_comments param as we're never going to use it (ruins line numbering) * Don't repeat ourselves about detecting REPLACER * Add an easy way to debug * Port test-module to the ziploader-aware modify_module() * strip comments and blank lines from the wrapper so we send less over the wire. * Comments cleanup * Remember to output write the module line itself in powershell modules * for line in lines strips the newlines so we have to add them back in
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modname,
modfile,
complex_args,
Templar(loader=loader),
task_vars=task_vars
)
AnsiballZ improvements Now that we don't need to worry about python-2.4 and 2.5, we can make some improvements to the way AnsiballZ handles modules. * Change AnsiballZ wrapper to use import to invoke the module We need the module to think of itself as a script because it could be coded as: main() or as: if __name__ == '__main__': main() Or even as: if __name__ == '__main__': random_function_name() A script will invoke all of those. Prior to this change, we invoked a second Python interpreter on the module so that it really was a script. However, this means that we have to run python twice (once for the AnsiballZ wrapper and once for the module). This change makes the module think that it is a script (because __name__ in the module == '__main__') but it's actually being invoked by us importing the module code. There's three ways we've come up to do this. * The most elegant is to use zipimporter and tell the import mechanism that the module being loaded is __main__: * https://github.com/abadger/ansible/blob/5959f11c9ddb7b6eaa9c3214560bd85e631d4055/lib/ansible/executor/module_common.py#L175 * zipimporter is nice because we do not have to extract the module from the zip file and save it to the disk when we do that. The import machinery does it all for us. * The drawback is that modules do not have a __file__ which points to a real file when they do this. Modules could be using __file__ to for a variety of reasons, most of those probably have replacements (the most common one is to find a writable directory for temporary files. AnsibleModule.tmpdir should be used instead) We can monkeypatch __file__ in fom AnsibleModule initialization but that's kind of gross. There's no way I can see to do this from the wrapper. * Next, there's imp.load_module(): * https://github.com/abadger/ansible/blob/340edf7489/lib/ansible/executor/module_common.py#L151 * imp has the nice property of allowing us to set __name__ to __main__ without changing the name of the file itself * We also don't have to do anything special to set __file__ for backwards compatibility (although the reason for that is the drawback): * Its drawback is that it requires the file to exist on disk so we have to explicitly extract it from the zipfile and save it to a temporary file * The last choice is to use exec to execute the module: * https://github.com/abadger/ansible/blob/f47a4ccc76/lib/ansible/executor/module_common.py#L175 * The code we would have to maintain for this looks pretty clean. In the wrapper we create a ModuleType, set __file__ on it, read the module's contents in from the zip file and then exec it. * Drawbacks: We still have to explicitly extract the file's contents from the zip archive instead of letting python's import mechanism handle it. * Exec also has hidden performance issues and breaks certain assumptions that modules could be making about their own code: http://lucumr.pocoo.org/2011/2/1/exec-in-python/ Our plan is to use imp.load_module() for now, deprecate the use of __file__ in modules, and switch to zipimport once the deprecation period for __file__ is over (without monkeypatching a fake __file__ in via AnsibleModule). * Rename the name of the AnsiBallZ wrapped module This makes it obvious that the wrapped module isn't the module file that we distribute. It's part of trying to mitigate the fact that the module is now named __main)).py in tracebacks. * Shield all wrapper symbols inside of a function With the new import code, all symbols in the wrapper become visible in the module. To mitigate the chance of collisions, move most symbols into a toplevel function. The only symbols left in the global namespace are now _ANSIBALLZ_WRAPPER and _ansiballz_main. revised porting guide entry Integrate code coverage collection into AnsiballZ. ci_coverage ci_complete
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if module_style == 'new' and '_ANSIBALLZ_WRAPPER = True' in to_native(module_data):
module_style = 'ansiballz'
modfile2_path = os.path.expanduser(destfile)
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print("* including generated source, if any, saving to: %s" % modfile2_path)
if module_style not in ('ansiballz', 'old'):
print("* this may offset any line numbers in tracebacks/debuggers!")
modfile2 = open(modfile2_path, 'wb')
modfile2.write(module_data)
modfile2.close()
modfile = modfile2_path
return (modfile2_path, modname, module_style)
def ansiballz_setup(modfile, modname, interpreters):
os.system("chmod +x %s" % modfile)
if 'ansible_python_interpreter' in interpreters:
command = [interpreters['ansible_python_interpreter']]
else:
command = []
command.extend([modfile, 'explode'])
cmd = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err = cmd.communicate()
out, err = to_text(out, errors='surrogate_or_strict'), to_text(err)
lines = out.splitlines()
if len(lines) != 2 or 'Module expanded into' not in lines[0]:
print("*" * 35)
print("INVALID OUTPUT FROM ANSIBALLZ MODULE WRAPPER")
print(out)
sys.exit(err)
debug_dir = lines[1].strip()
argsfile = os.path.join(debug_dir, 'args')
AnsiballZ improvements Now that we don't need to worry about python-2.4 and 2.5, we can make some improvements to the way AnsiballZ handles modules. * Change AnsiballZ wrapper to use import to invoke the module We need the module to think of itself as a script because it could be coded as: main() or as: if __name__ == '__main__': main() Or even as: if __name__ == '__main__': random_function_name() A script will invoke all of those. Prior to this change, we invoked a second Python interpreter on the module so that it really was a script. However, this means that we have to run python twice (once for the AnsiballZ wrapper and once for the module). This change makes the module think that it is a script (because __name__ in the module == '__main__') but it's actually being invoked by us importing the module code. There's three ways we've come up to do this. * The most elegant is to use zipimporter and tell the import mechanism that the module being loaded is __main__: * https://github.com/abadger/ansible/blob/5959f11c9ddb7b6eaa9c3214560bd85e631d4055/lib/ansible/executor/module_common.py#L175 * zipimporter is nice because we do not have to extract the module from the zip file and save it to the disk when we do that. The import machinery does it all for us. * The drawback is that modules do not have a __file__ which points to a real file when they do this. Modules could be using __file__ to for a variety of reasons, most of those probably have replacements (the most common one is to find a writable directory for temporary files. AnsibleModule.tmpdir should be used instead) We can monkeypatch __file__ in fom AnsibleModule initialization but that's kind of gross. There's no way I can see to do this from the wrapper. * Next, there's imp.load_module(): * https://github.com/abadger/ansible/blob/340edf7489/lib/ansible/executor/module_common.py#L151 * imp has the nice property of allowing us to set __name__ to __main__ without changing the name of the file itself * We also don't have to do anything special to set __file__ for backwards compatibility (although the reason for that is the drawback): * Its drawback is that it requires the file to exist on disk so we have to explicitly extract it from the zipfile and save it to a temporary file * The last choice is to use exec to execute the module: * https://github.com/abadger/ansible/blob/f47a4ccc76/lib/ansible/executor/module_common.py#L175 * The code we would have to maintain for this looks pretty clean. In the wrapper we create a ModuleType, set __file__ on it, read the module's contents in from the zip file and then exec it. * Drawbacks: We still have to explicitly extract the file's contents from the zip archive instead of letting python's import mechanism handle it. * Exec also has hidden performance issues and breaks certain assumptions that modules could be making about their own code: http://lucumr.pocoo.org/2011/2/1/exec-in-python/ Our plan is to use imp.load_module() for now, deprecate the use of __file__ in modules, and switch to zipimport once the deprecation period for __file__ is over (without monkeypatching a fake __file__ in via AnsibleModule). * Rename the name of the AnsiBallZ wrapped module This makes it obvious that the wrapped module isn't the module file that we distribute. It's part of trying to mitigate the fact that the module is now named __main)).py in tracebacks. * Shield all wrapper symbols inside of a function With the new import code, all symbols in the wrapper become visible in the module. To mitigate the chance of collisions, move most symbols into a toplevel function. The only symbols left in the global namespace are now _ANSIBALLZ_WRAPPER and _ansiballz_main. revised porting guide entry Integrate code coverage collection into AnsiballZ. ci_coverage ci_complete
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modfile = os.path.join(debug_dir, '__main__.py')
print("* ansiballz module detected; extracted module source to: %s" % debug_dir)
return modfile, argsfile
def runtest(modfile, argspath, modname, module_style, interpreters):
"""Test run a module, piping it's output for reporting."""
invoke = ""
if module_style == 'ansiballz':
modfile, argspath = ansiballz_setup(modfile, modname, interpreters)
if 'ansible_python_interpreter' in interpreters:
invoke = "%s " % interpreters['ansible_python_interpreter']
os.system("chmod +x %s" % modfile)
invoke = "%s%s" % (invoke, modfile)
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if argspath is not None:
invoke = "%s %s" % (invoke, argspath)
cmd = subprocess.Popen(invoke, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
(out, err) = cmd.communicate()
out, err = to_text(out), to_text(err)
try:
print("*" * 35)
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print("RAW OUTPUT")
print(out)
print(err)
results = json.loads(out)
except:
print("*" * 35)
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print("INVALID OUTPUT FORMAT")
print(out)
traceback.print_exc()
sys.exit(1)
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print("*" * 35)
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print("PARSED OUTPUT")
print(jsonify(results,format=True))
def rundebug(debugger, modfile, argspath, modname, module_style, interpreters):
"""Run interactively with console debugger."""
if module_style == 'ansiballz':
modfile, argspath = ansiballz_setup(modfile, modname, interpreters)
if argspath is not None:
subprocess.call("%s %s %s" % (debugger, modfile, argspath), shell=True)
else:
subprocess.call("%s %s" % (debugger, modfile), shell=True)
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def main():
options, args = parse()
interpreters = get_interpreters(options.interpreter)
(modfile, modname, module_style) = boilerplate_module(options.module_path, options.module_args, interpreters, options.check, options.filename)
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argspath = None
if module_style not in ('new', 'ansiballz'):
if module_style in ('non_native_want_json', 'binary'):
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, modname, module_style, interpreters)
else:
runtest(modfile, argspath, modname, module_style, interpreters)
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if __name__ == "__main__":
try:
main()
finally:
shutil.rmtree(C.DEFAULT_LOCAL_TMP, True)