Mini Shell
import copy
import functools
import importlib
import importlib.machinery
import importlib.util
import inspect
import logging
import os
import pathlib
import re
import sys
import tempfile
import threading
import time
import traceback
import types
from collections.abc import MutableMapping
from zipimport import zipimporter # pylint: disable=no-name-in-module
import salt.config
import salt.defaults.events
import salt.defaults.exitcodes
import salt.loader.context
import salt.syspaths
import salt.utils.args
import salt.utils.context
import salt.utils.data
import salt.utils.dictupdate
import salt.utils.event
import salt.utils.files
import salt.utils.lazy
import salt.utils.odict
import salt.utils.platform
import salt.utils.stringutils
import salt.utils.versions
from salt.utils.decorators import Depends
from salt.utils.decorators.extension_deprecation import extension_deprecation_message
try:
# Try the stdlib C extension first
import _contextvars as contextvars
except ImportError:
# Py<3.7
import contextvars
log = logging.getLogger(__name__)
# pylint: disable=no-member
MODULE_KIND_SOURCE = 1
MODULE_KIND_COMPILED = 2
MODULE_KIND_EXTENSION = 3
MODULE_KIND_PKG_DIRECTORY = 5
SUFFIXES = []
for suffix in importlib.machinery.EXTENSION_SUFFIXES:
SUFFIXES.append((suffix, "rb", MODULE_KIND_EXTENSION))
for suffix in importlib.machinery.SOURCE_SUFFIXES:
SUFFIXES.append((suffix, "rb", MODULE_KIND_SOURCE))
for suffix in importlib.machinery.BYTECODE_SUFFIXES:
SUFFIXES.append((suffix, "rb", MODULE_KIND_COMPILED))
MODULE_KIND_MAP = {
MODULE_KIND_SOURCE: importlib.machinery.SourceFileLoader,
MODULE_KIND_COMPILED: importlib.machinery.SourcelessFileLoader,
MODULE_KIND_EXTENSION: importlib.machinery.ExtensionFileLoader,
}
# pylint: enable=no-member
SALT_BASE_PATH = pathlib.Path(salt.syspaths.INSTALL_DIR).resolve()
LOADED_BASE_NAME = "salt.loaded"
PY3_PRE_EXT = re.compile(r"\.cpython-{}{}(\.opt-[1-9])?".format(*sys.version_info[:2]))
# Will be set to pyximport module at runtime if cython is enabled in config.
pyximport = None
def _generate_module(name):
if name in sys.modules:
return
code = "'''Salt loaded {} parent module'''".format(name.split(".")[-1])
# ModuleType can't accept a unicode type on PY2
module = types.ModuleType(str(name))
exec(code, module.__dict__)
sys.modules[name] = module
def _mod_type(module_path):
if module_path.startswith(str(SALT_BASE_PATH)):
return "int"
return "ext"
class FilterDictWrapper(MutableMapping):
"""
Create a dict which wraps another dict with a specific key suffix on get
This is to replace "filter_load"
"""
def __init__(self, d, suffix):
self._dict = d
self.suffix = suffix
def __setitem__(self, key, val):
self._dict[key] = val
def __delitem__(self, key):
del self._dict[key]
def __getitem__(self, key):
return self._dict[key + self.suffix]
def __len__(self):
return len(self._dict)
def __iter__(self):
for key in self._dict:
if key.endswith(self.suffix):
yield key.replace(self.suffix, "")
class LoadedFunc:
"""
The functions loaded by LazyLoader instances using subscript notation
'a[k]' will be wrapped with LoadedFunc.
- Makes sure functions are called with the correct loader's context.
- Provides access to a wrapped func's __global__ attribute
:param func str: The function name to wrap
:param LazyLoader loader: The loader instance to use in the context when the wrapped callable is called.
"""
def __init__(self, name, loader):
self.name = name
self.loader = loader
functools.update_wrapper(self, self.func)
@property
def func(self):
return self.loader._dict[self.name]
def __getattr__(self, name):
return getattr(self.func, name)
def __call__(self, *args, **kwargs):
run_func = self.func
mod = sys.modules[run_func.__module__]
# All modules we've imported should have __opts__ defined. There are
# cases in the test suite where mod ends up being something other than
# a module we've loaded.
set_test = False
if hasattr(mod, "__opts__"):
if not isinstance(mod.__opts__, salt.loader.context.NamedLoaderContext):
if "test" in self.loader.opts:
mod.__opts__["test"] = self.loader.opts["test"]
set_test = True
if self.loader.inject_globals:
run_func = global_injector_decorator(self.loader.inject_globals)(run_func)
ret = self.loader.run(run_func, *args, **kwargs)
if set_test:
self.loader.opts["test"] = mod.__opts__["test"]
return ret
def __repr__(self):
return f"<{self.__class__.__name__} name={self.name!r}>"
class LoadedCoro(LoadedFunc):
"""
Coroutine functions loaded by LazyLoader instances using subscript notation
'a[k]' will be wrapped with LoadedCoro.
- Makes sure functions are called with the correct loader's context.
- Provides access to a wrapped func's __global__ attribute
:param func str: The function name to wrap
:param LazyLoader loader: The loader instance to use in the context when the wrapped callable is called.
"""
async def __call__(
self, *args, **kwargs
): # pylint: disable=invalid-overridden-method
run_func = self.func
mod = sys.modules[run_func.__module__]
# All modules we've imported should have __opts__ defined. There are
# cases in the test suite where mod ends up being something other than
# a module we've loaded.
set_test = False
if hasattr(mod, "__opts__"):
if not isinstance(mod.__opts__, salt.loader.context.NamedLoaderContext):
if "test" in self.loader.opts:
mod.__opts__["test"] = self.loader.opts["test"]
set_test = True
if self.loader.inject_globals:
run_func = global_injector_decorator(self.loader.inject_globals)(run_func)
ret = await self.loader.run(run_func, *args, **kwargs)
if set_test:
self.loader.opts["test"] = mod.__opts__["test"]
return ret
class LoadedMod:
"""
This class is used as a proxy to a loaded module
"""
__slots__ = ("mod", "loader")
def __init__(self, mod, loader):
"""
Return the wrapped func's globals via this object's __globals__
attribute.
"""
self.mod = mod
self.loader = loader
def __getattr__(self, name):
"""
Run the wrapped function in the loader's context.
"""
try:
return self.loader[f"{self.mod}.{name}"]
except KeyError:
raise AttributeError(
f"No attribute by the name of {name} was found on {self.mod}"
)
def __repr__(self):
return "<{} module='{}.{}'>".format(
self.__class__.__name__, self.loader.loaded_base_name, self.mod
)
class LazyLoader(salt.utils.lazy.LazyDict):
"""
A pseduo-dictionary which has a set of keys which are the
name of the module and function, delimited by a dot. When
the value of the key is accessed, the function is then loaded
from disk and into memory.
.. note::
Iterating over keys will cause all modules to be loaded.
:param list module_dirs: A list of directories on disk to search for modules
:param dict opts: The salt options dictionary.
:param str tag: The tag for the type of module to load
:param func mod_type_check: A function which can be used to verify files
:param dict pack: A dictionary of function to be packed into modules as they are loaded
:param list whitelist: A list of modules to whitelist
:param bool virtual_enable: Whether or not to respect the __virtual__ function when loading modules.
:param str virtual_funcs: The name of additional functions in the module to call to verify its functionality.
If not true, the module will not load.
:param list extra_module_dirs: A list of directories that will be able to import from
:param str pack_self: Pack this module into a variable by this name into modules loaded
:returns: A LazyLoader object which functions as a dictionary. Keys are 'module.function' and values
are function references themselves which are loaded on-demand.
# TODO:
- move modules_max_memory into here
- singletons (per tag)
"""
mod_dict_class = dict
def __init__(
self,
module_dirs,
opts=None,
tag="module",
loaded_base_name=None,
mod_type_check=None,
pack=None,
whitelist=None,
virtual_enable=True,
static_modules=None,
proxy=None,
virtual_funcs=None,
extra_module_dirs=None,
pack_self=None,
# Once we get rid of __utils__, the keyword argument bellow should be removed
_only_pack_properly_namespaced_functions=True,
): # pylint: disable=W0231
"""
In pack, if any of the values are None they will be replaced with an
empty context-specific dict
"""
self.parent_loader = None
self.inject_globals = {}
self.pack = {} if pack is None else pack
for i in self.pack:
if isinstance(self.pack[i], salt.loader.context.NamedLoaderContext):
self.pack[i] = self.pack[i].value()
if opts is None:
opts = {}
opts = copy.deepcopy(opts)
for i in ["pillar", "grains"]:
if i in opts and isinstance(
opts[i], salt.loader.context.NamedLoaderContext
):
opts[i] = opts[i].value()
threadsafety = not opts.get("multiprocessing")
self.opts = self.__prep_mod_opts(opts)
self.pack_self = pack_self
self.module_dirs = module_dirs
self.tag = tag
self._gc_finalizer = None
self.loaded_base_name = loaded_base_name or LOADED_BASE_NAME
self.mod_type_check = mod_type_check or _mod_type
self._only_pack_properly_namespaced_functions = (
_only_pack_properly_namespaced_functions
)
if "__context__" not in self.pack:
self.pack["__context__"] = None
for k, v in list(self.pack.items()):
if v is None: # if the value of a pack is None, lets make an empty dict
self.pack[k] = {}
self.whitelist = whitelist
self.virtual_enable = virtual_enable
self.initial_load = True
# names of modules that we don't have (errors, __virtual__, etc.)
self.missing_modules = {} # mapping of name -> error
self.loaded_modules = set()
self.loaded_files = set() # TODO: just remove them from file_mapping?
self.static_modules = static_modules if static_modules else []
if virtual_funcs is None:
virtual_funcs = []
self.virtual_funcs = virtual_funcs
self.extra_module_dirs = extra_module_dirs if extra_module_dirs else []
self._clean_module_dirs = []
self.disabled = set(
self.opts.get(
"disable_{}{}".format(self.tag, "" if self.tag[-1] == "s" else "s"),
[],
)
)
# A map of suffix to description for imp
self.suffix_map = {}
# A list to determine precedence of extensions
# Prefer packages (directories) over modules (single files)!
self.suffix_order = [""]
for suffix, mode, kind in SUFFIXES:
self.suffix_map[suffix] = (suffix, mode, kind)
self.suffix_order.append(suffix)
self._lock = self._get_lock()
with self._lock:
self._refresh_file_mapping()
super().__init__() # late init the lazy loader
# create all of the import namespaces
_generate_module(f"{self.loaded_base_name}.int")
_generate_module(f"{self.loaded_base_name}.int.{tag}")
_generate_module(f"{self.loaded_base_name}.ext")
_generate_module(f"{self.loaded_base_name}.ext.{tag}")
def _get_lock(self):
return threading.RLock()
def clean_modules(self):
"""
Clean modules
"""
for name in list(sys.modules):
if name.startswith(self.loaded_base_name):
del sys.modules[name]
def __getitem__(self, item):
"""
Override the __getitem__ in order to decorate the returned function if we need
to last-minute inject globals
"""
_ = super().__getitem__(item) # try to get the item from the dictionary
if not isinstance(_, LoadedFunc) and inspect.iscoroutinefunction(_):
return LoadedCoro(item, self)
return LoadedFunc(item, self)
def __getattr__(self, mod_name):
"""
Allow for "direct" attribute access-- this allows jinja templates to
access things like `salt.test.ping()`
"""
if mod_name in ("__getstate__", "__setstate__"):
return object.__getattribute__(self, mod_name)
# if we have an attribute named that, lets return it.
try:
return object.__getattr__(self, mod_name) # pylint: disable=no-member
except AttributeError:
pass
# otherwise we assume its jinja template access
if mod_name not in self.loaded_modules and not self.loaded:
for name in self._iter_files(mod_name):
if name in self.loaded_files:
continue
# if we got what we wanted, we are done
if self._load_module(name) and mod_name in self.loaded_modules:
break
if mod_name in self.loaded_modules:
return LoadedMod(mod_name, self)
else:
raise AttributeError(mod_name)
def __repr__(self):
return "<{} module='{}.{}'>".format(
self.__class__.__name__, self.loaded_base_name, self.tag
)
def missing_fun_string(self, function_name):
"""
Return the error string for a missing function.
This can range from "not available' to "__virtual__" returned False
"""
mod_name = function_name.split(".")[0]
if mod_name in self.loaded_modules:
return f"'{function_name}' is not available."
else:
try:
reason = self.missing_modules[mod_name]
except KeyError:
return f"'{function_name}' is not available."
else:
if reason is not None:
return "'{}' __virtual__ returned False: {}".format(
mod_name, reason
)
else:
return f"'{mod_name}' __virtual__ returned False"
def _refresh_file_mapping(self):
"""
refresh the mapping of the FS on disk
"""
# map of suffix to description for imp
if (
self.opts.get("cython_enable", True) is True
and ".pyx" not in self.suffix_map
):
try:
global pyximport
pyximport = __import__("pyximport") # pylint: disable=import-error
pyximport.install()
# add to suffix_map so file_mapping will pick it up
self.suffix_map[".pyx"] = tuple()
if ".pyx" not in self.suffix_order:
self.suffix_order.append(".pyx")
except ImportError:
log.info(
"Cython is enabled in the options but not present "
"in the system path. Skipping Cython modules."
)
# Allow for zipimport of modules
if (
self.opts.get("enable_zip_modules", True) is True
and ".zip" not in self.suffix_map
):
self.suffix_map[".zip"] = tuple()
if ".zip" not in self.suffix_order:
self.suffix_order.append(".zip")
# allow for module dirs
self.suffix_map[""] = ("", "", MODULE_KIND_PKG_DIRECTORY)
# create mapping of filename (without suffix) to (path, suffix)
# The files are added in order of priority, so order *must* be retained.
self.file_mapping = salt.utils.odict.OrderedDict()
opt_match = []
def _replace_pre_ext(obj):
"""
Hack so we can get the optimization level that we replaced (if
any) out of the re.sub call below. We use a list here because
it is a persistent data structure that we will be able to
access after re.sub is called.
"""
opt_match.append(obj)
return ""
for mod_dir in self.module_dirs:
try:
# Make sure we have a sorted listdir in order to have
# expectable override results
files = sorted(x for x in os.listdir(mod_dir) if x != "__pycache__")
except OSError:
continue # Next mod_dir
try:
pycache_files = [
os.path.join("__pycache__", x)
for x in sorted(os.listdir(os.path.join(mod_dir, "__pycache__")))
]
except OSError:
pass
else:
files.extend(pycache_files)
for filename in files:
try:
dirname, basename = os.path.split(filename)
if basename.startswith("_"):
# skip private modules
# log messages omitted for obviousness
continue # Next filename
f_noext, ext = os.path.splitext(basename)
f_noext = PY3_PRE_EXT.sub(_replace_pre_ext, f_noext)
try:
opt_level = int(opt_match.pop().group(1).rsplit("-", 1)[-1])
except (AttributeError, IndexError, ValueError):
# No regex match or no optimization level matched
opt_level = 0
try:
opt_index = self.opts["optimization_order"].index(opt_level)
except KeyError:
log.trace(
"Disallowed optimization level %d for module "
"name '%s', skipping. Add %d to the "
"'optimization_order' config option if you "
"do not want to ignore this optimization "
"level.",
opt_level,
f_noext,
opt_level,
)
continue
# make sure it is a suffix we support
if ext not in self.suffix_map:
continue # Next filename
if f_noext in self.disabled:
log.trace(
"Skipping %s, it is disabled by configuration", filename
)
continue # Next filename
fpath = os.path.join(mod_dir, filename)
# if its a directory, lets allow us to load that
if ext == "":
# is there something __init__?
subfiles = os.listdir(fpath)
for suffix in self.suffix_order:
if "" == suffix:
continue # Next suffix (__init__ must have a suffix)
init_file = f"__init__{suffix}"
if init_file in subfiles:
break
else:
continue # Next filename
try:
curr_ext = self.file_mapping[f_noext][1]
curr_opt_index = self.file_mapping[f_noext][2]
except KeyError:
pass
else:
if "" in (curr_ext, ext) and curr_ext != ext:
log.error(
"Module/package collision: '%s' and '%s'",
fpath,
self.file_mapping[f_noext][0],
)
if ext == ".pyc" and curr_ext == ".pyc":
# Check the optimization level
if opt_index >= curr_opt_index:
# Module name match, but a higher-priority
# optimization level was already matched, skipping.
continue
elif not curr_ext or self.suffix_order.index(
ext
) >= self.suffix_order.index(curr_ext):
# Match found but a higher-priorty match already
# exists, so skip this.
continue
if not dirname and ext == ".pyc":
# On Python 3, we should only load .pyc files from the
# __pycache__ subdirectory (i.e. when dirname is not an
# empty string).
continue
# Made it this far - add it
self.file_mapping[f_noext] = (fpath, ext, opt_index)
except OSError:
continue
for smod in self.static_modules:
f_noext = smod.split(".")[-1]
self.file_mapping[f_noext] = (smod, ".o", 0)
def clear(self):
"""
Clear the dict
"""
with self._lock:
super().clear() # clear the lazy loader
self.loaded_files = set()
self.missing_modules = {}
self.loaded_modules = set()
# if we have been loaded before, lets clear the file mapping since
# we obviously want a re-do
if hasattr(self, "opts"):
self._refresh_file_mapping()
self.initial_load = False
def __prep_mod_opts(self, opts):
"""
Strip out of the opts any logger instance
"""
if "__grains__" not in self.pack:
grains = opts.get("grains", {})
if isinstance(grains, salt.loader.context.NamedLoaderContext):
grains = grains.value()
self.pack["__grains__"] = grains
if "__pillar__" not in self.pack:
pillar = opts.get("pillar", {})
if isinstance(pillar, salt.loader.context.NamedLoaderContext):
pillar = pillar.value()
self.pack["__pillar__"] = pillar
mod_opts = {}
for key, val in list(opts.items()):
if key == "logger":
continue
mod_opts[key] = val
if "__opts__" not in self.pack:
self.pack["__opts__"] = mod_opts
return mod_opts
def _iter_files(self, mod_name):
"""
Iterate over all file_mapping files in order of closeness to mod_name
"""
# do we have an exact match?
if mod_name in self.file_mapping:
yield mod_name
# do we have a partial match?
for k in self.file_mapping:
if mod_name in k:
yield k
# anyone else? Bueller?
for k in self.file_mapping:
if mod_name not in k:
yield k
def _reload_submodules(self, mod):
submodules = (
getattr(mod, sname)
for sname in dir(mod)
if isinstance(getattr(mod, sname), mod.__class__)
)
# reload only custom "sub"modules
for submodule in submodules:
# it is a submodule if the name is in a namespace under mod
if submodule.__name__.startswith(mod.__name__ + "."):
importlib.reload(submodule)
self._reload_submodules(submodule)
def __populate_sys_path(self):
for directory in self.extra_module_dirs:
if directory not in sys.path:
sys.path.append(directory)
self._clean_module_dirs.append(directory)
def __clean_sys_path(self):
invalidate_path_importer_cache = False
for directory in self._clean_module_dirs:
if directory in sys.path:
sys.path.remove(directory)
invalidate_path_importer_cache = True
self._clean_module_dirs = []
# Be sure that sys.path_importer_cache do not contains any
# invalid FileFinder references
importlib.invalidate_caches()
# Because we are mangling with importlib, we can find from
# time to time an invalidation issue with
# sys.path_importer_cache, that requires the removal of
# FileFinder that remain None for the extra_module_dirs
if invalidate_path_importer_cache:
for directory in self.extra_module_dirs:
if (
directory in sys.path_importer_cache
and sys.path_importer_cache[directory] is None
):
del sys.path_importer_cache[directory]
def _load_module(self, name):
mod = None
fpath, suffix = self.file_mapping[name][:2]
# if the fpath has `.cpython-3x` in it, but the running Py version
# is 3.y, the following will cause us to return immediately and we won't try to import this .pyc.
# This is for the unusual case where several Python versions share a single
# source tree and drop their .pycs in the same __pycache__ folder.
# If we were to load a .pyc for another Py version it's not a big problem
# but the log will get spammed with "Bad Magic Number" messages that
# can be very misleading if the user is debugging another problem.
try:
(implementation_tag, cache_tag_ver) = sys.implementation.cache_tag.split(
"-"
)
if cache_tag_ver not in fpath and implementation_tag in fpath:
log.trace(
"Trying to load %s on %s, returning False.",
fpath,
sys.implementation.cache_tag,
)
return False
except AttributeError:
# Most likely Py 2.7 or some other Python version we don't really support
pass
self.loaded_files.add(name)
fpath_dirname = os.path.dirname(fpath)
try:
self.__populate_sys_path()
sys.path.append(fpath_dirname)
if suffix == ".pyx":
mod = pyximport.load_module(name, fpath, tempfile.gettempdir())
elif suffix == ".o":
top_mod = __import__(fpath, globals(), locals(), [])
comps = fpath.split(".")
if len(comps) < 2:
mod = top_mod
else:
mod = top_mod
for subname in comps[1:]:
mod = getattr(mod, subname)
elif suffix == ".zip":
mod = zipimporter(fpath).load_module(name)
else:
desc = self.suffix_map[suffix]
# if it is a directory, we don't open a file
try:
mod_namespace = ".".join(
(
self.loaded_base_name,
self.mod_type_check(fpath),
self.tag,
name,
)
)
except TypeError:
mod_namespace = "{}.{}.{}.{}".format(
self.loaded_base_name,
self.mod_type_check(fpath),
self.tag,
name,
)
if suffix == "":
# pylint: disable=no-member
# Package directory, look for __init__
loader_details = [
(
importlib.machinery.SourceFileLoader,
importlib.machinery.SOURCE_SUFFIXES,
),
(
importlib.machinery.SourcelessFileLoader,
importlib.machinery.BYTECODE_SUFFIXES,
),
(
importlib.machinery.ExtensionFileLoader,
importlib.machinery.EXTENSION_SUFFIXES,
),
]
file_finder = importlib.machinery.FileFinder(
fpath_dirname, *loader_details
)
spec = file_finder.find_spec(mod_namespace)
if spec is None:
raise ImportError()
mod = importlib.util.module_from_spec(spec)
spec.loader.exec_module(mod)
# pylint: enable=no-member
sys.modules[mod_namespace] = mod
# reload all submodules if necessary
if not self.initial_load:
self._reload_submodules(mod)
else:
# pylint: disable=no-member
loader = MODULE_KIND_MAP[desc[2]](mod_namespace, fpath)
spec = importlib.util.spec_from_file_location(
mod_namespace, fpath, loader=loader
)
if spec is None:
raise ImportError()
mod = importlib.util.module_from_spec(spec)
spec.loader.exec_module(mod)
# pylint: enable=no-member
sys.modules[mod_namespace] = mod
except OSError:
raise
except ImportError as exc:
if "magic number" in str(exc):
error_msg = (
"Failed to import {} {}. Bad magic number. If migrating from"
" Python2 to Python3, remove all .pyc files and try again.".format(
self.tag, name
)
)
log.warning(error_msg)
self.missing_modules[name] = error_msg
log.debug("Failed to import %s %s:\n", self.tag, name, exc_info=True)
self.missing_modules[name] = exc
return False
except Exception as error: # pylint: disable=broad-except
log.error(
"Failed to import %s %s, this is due most likely to a syntax error:\n",
self.tag,
name,
exc_info=True,
)
self.missing_modules[name] = error
return False
except SystemExit as error:
try:
fn_, _, caller, _ = traceback.extract_tb(sys.exc_info()[2])[-1]
except IndexError:
pass
else:
tgt_fns = [
os.path.join("salt", "utils", "process.py"),
os.path.join("salt", "cli", "daemons.py"),
os.path.join("salt", "cli", "api.py"),
]
for tgt_fn in tgt_fns:
if fn_.endswith(tgt_fn) and "_handle_signals" in caller:
# Race conditon, SIGTERM or SIGINT received while loader
# was in process of loading a module. Call sys.exit to
# ensure that the process is killed.
sys.exit(salt.defaults.exitcodes.EX_OK)
log.error(
"Failed to import %s %s as the module called exit()\n",
self.tag,
name,
exc_info=True,
)
self.missing_modules[name] = error
return False
finally:
sys.path.remove(fpath_dirname)
self.__clean_sys_path()
loader_context = salt.loader.context.LoaderContext()
if hasattr(mod, "__salt_loader__"):
if not isinstance(mod.__salt_loader__, salt.loader.context.LoaderContext):
log.warning("Override __salt_loader__: %s", mod)
mod.__salt_loader__ = loader_context
else:
mod.__salt_loader__ = loader_context
if hasattr(mod, "__opts__"):
if not isinstance(mod.__opts__, salt.loader.context.NamedLoaderContext):
if not hasattr(mod, "__orig_opts__"):
mod.__orig_opts__ = copy.deepcopy(mod.__opts__)
mod.__opts__ = copy.deepcopy(mod.__orig_opts__)
mod.__opts__.update(self.opts)
else:
if not hasattr(mod, "__orig_opts__"):
mod.__orig_opts__ = {}
mod.__opts__ = copy.deepcopy(mod.__orig_opts__)
mod.__opts__.update(self.opts)
# pack whatever other globals we were asked to
for p_name, p_value in self.pack.items():
if p_name == "__opts__":
continue
mod_named_context = getattr(mod, p_name, None)
if hasattr(mod_named_context, "default"):
default = copy.deepcopy(mod_named_context.default)
else:
default = None
named_context = loader_context.named_context(p_name, default)
if mod_named_context is None:
setattr(mod, p_name, named_context)
elif named_context != mod_named_context:
log.debug("Override %s: %s", p_name, mod)
setattr(mod, p_name, named_context)
else:
setattr(mod, p_name, named_context)
if self.pack_self is not None:
mod_named_context = getattr(mod, self.pack_self, None)
if hasattr(mod_named_context, "default"):
default = copy.deepcopy(mod_named_context.default)
else:
default = None
named_context = loader_context.named_context(self.pack_self, default)
if mod_named_context is None:
setattr(mod, self.pack_self, named_context)
elif named_context != mod_named_context:
log.debug("Override %s: %s", self.pack_self, mod)
setattr(mod, self.pack_self, named_context)
else:
setattr(mod, self.pack_self, named_context)
module_name = mod.__name__.rsplit(".", 1)[-1]
# Call a module's initialization method if it exists
module_init = getattr(mod, "__init__", None)
if inspect.isfunction(module_init):
try:
self.run(module_init, self.opts)
except TypeError as e:
log.error(e)
except Exception: # pylint: disable=broad-except
err_string = "__init__ failed"
log.debug(
"Error loading %s.%s: %s",
self.tag,
module_name,
err_string,
exc_info=True,
)
self.missing_modules[module_name] = err_string
self.missing_modules[name] = err_string
return False
# if virtual modules are enabled, we need to look for the
# __virtual__() function inside that module and run it.
if self.virtual_enable:
virtual_funcs_to_process = ["__virtual__"] + self.virtual_funcs
for virtual_func in virtual_funcs_to_process:
(
virtual_ret,
module_name,
virtual_err,
virtual_aliases,
) = self._process_virtual(mod, module_name, virtual_func)
if virtual_err is not None:
log.trace(
"Error loading %s.%s: %s", self.tag, module_name, virtual_err
)
# if _process_virtual returned a non-True value then we are
# supposed to not process this module
if virtual_ret is not True and module_name not in self.missing_modules:
# If a module has information about why it could not be loaded, record it
self.missing_modules[module_name] = virtual_err
self.missing_modules[name] = virtual_err
return False
else:
virtual_aliases = ()
# If this is a proxy minion then MOST modules cannot work. Therefore, require that
# any module that does work with salt-proxy-minion define __proxyenabled__ as a list
# containing the names of the proxy types that the module supports.
#
# Render modules and state modules are OK though
if "proxy" in self.opts:
if self.tag in ["grains", "proxy"]:
if not hasattr(mod, "__proxyenabled__") or (
self.opts["proxy"]["proxytype"] not in mod.__proxyenabled__
and "*" not in mod.__proxyenabled__
):
err_string = "not a proxy_minion enabled module"
self.missing_modules[module_name] = err_string
self.missing_modules[name] = err_string
return False
try:
funcs_to_load = mod.__load__
log.debug(
"The functions from module '%s' are being loaded from the "
"provided __load__ attribute",
module_name,
)
except AttributeError:
try:
funcs_to_load = mod.__all__
log.debug(
"The functions from module '%s' are being loaded from the "
"provided __all__ attribute",
module_name,
)
except AttributeError:
funcs_to_load = dir(mod)
log.debug(
"The functions from module '%s' are being loaded by "
"dir() on the loaded module",
module_name,
)
# If we had another module by the same virtual name, we should put any
# new functions under the existing dictionary.
mod_names = [module_name] + list(virtual_aliases)
for attr in funcs_to_load:
if attr.startswith("_"):
# private functions are skipped
continue
func = getattr(mod, attr)
if not inspect.isfunction(func) and not isinstance(func, functools.partial):
# Not a function!? Skip it!!!
continue
if (
self._only_pack_properly_namespaced_functions
and not func.__module__.startswith(self.loaded_base_name)
):
# We're not interested in imported functions, only
# functions defined(or namespaced) on the loaded module.
continue
# When the module is deprecated wrap functions in deprecation
# warning.
if hasattr(mod, "__deprecated__"):
func = extension_deprecation_message(*mod.__deprecated__)(func)
# Let's get the function name.
# If the module has the __func_alias__ attribute, it must be a
# dictionary mapping in the form of(key -> value):
# <real-func-name> -> <desired-func-name>
#
# It default's of course to the found callable attribute name
# if no alias is defined.
funcname = getattr(mod, "__func_alias__", {}).get(attr, attr)
for tgt_mod in mod_names:
try:
full_funcname = ".".join((tgt_mod, funcname))
except TypeError:
full_funcname = f"{tgt_mod}.{funcname}"
# Save many references for lookups
# Careful not to overwrite existing (higher priority) functions
if full_funcname not in self._dict:
self._dict[full_funcname] = func
self._apply_outputter(func, mod)
self.loaded_modules.add(tgt_mod)
# enforce depends
try:
Depends.enforce_dependencies(self._dict, self.tag, name)
except RuntimeError as exc:
log.info(
"Depends.enforce_dependencies() failed for the following reason: %s",
exc,
)
return True
def _load(self, key):
"""
Load a single item if you have it
"""
# if the key doesn't have a '.' then it isn't valid for this mod dict
if not isinstance(key, str):
raise KeyError("The key must be a string.")
if "." not in key:
raise KeyError(f"The key '{key}' should contain a '.'")
mod_name, _ = key.split(".", 1)
with self._lock:
# It is possible that the key is in the dictionary after
# acquiring the lock due to another thread loading it.
if mod_name in self.missing_modules or key in self._dict:
return True
# if the modulename isn't in the whitelist, don't bother
if self.whitelist and mod_name not in self.whitelist:
log.error(
"Failed to load function %s because its module (%s) is "
"not in the whitelist: %s",
key,
mod_name,
self.whitelist,
)
raise KeyError(key)
def _inner_load(mod_name):
for name in self._iter_files(mod_name):
if name in self.loaded_files:
continue
# if we got what we wanted, we are done
if self._load_module(name) and key in self._dict:
return True
return False
# try to load the module
ret = None
reloaded = False
# re-scan up to once, IOErrors or a failed load cause re-scans of the
# filesystem
while True:
try:
ret = _inner_load(mod_name)
if not reloaded and ret is not True:
self._refresh_file_mapping()
reloaded = True
continue
break
except OSError:
if not reloaded:
self._refresh_file_mapping()
reloaded = True
continue
return ret
def _load_all(self):
"""
Load all of them
"""
with self._lock:
for name in self.file_mapping:
if name in self.loaded_files or name in self.missing_modules:
continue
self._load_module(name)
self.loaded = True
def reload_modules(self):
with self._lock:
self.loaded_files = set()
self._load_all()
def _apply_outputter(self, func, mod):
"""
Apply the __outputter__ variable to the functions
"""
if hasattr(mod, "__outputter__"):
outp = mod.__outputter__
if func.__name__ in outp:
func.__outputter__ = outp[func.__name__]
def _process_virtual(self, mod, module_name, virtual_func="__virtual__"):
"""
Given a loaded module and its default name determine its virtual name
This function returns a tuple. The first value will be either True or
False and will indicate if the module should be loaded or not (i.e. if
it threw and exception while processing its __virtual__ function). The
second value is the determined virtual name, which may be the same as
the value provided.
The default name can be calculated as follows::
module_name = mod.__name__.rsplit('.', 1)[-1]
"""
# The __virtual__ function will return either a True or False value.
# If it returns a True value it can also set a module level attribute
# named __virtualname__ with the name that the module should be
# referred to as.
#
# This allows us to have things like the pkg module working on all
# platforms under the name 'pkg'. It also allows for modules like
# augeas_cfg to be referred to as 'augeas', which would otherwise have
# namespace collisions. And finally it allows modules to return False
# if they are not intended to run on the given platform or are missing
# dependencies.
virtual_aliases = getattr(mod, "__virtual_aliases__", tuple())
try:
error_reason = None
if hasattr(mod, "__virtual__") and inspect.isfunction(mod.__virtual__):
try:
start = time.time()
virtual_attr = getattr(mod, virtual_func)
virtual = self.run(virtual_attr)
if isinstance(virtual, tuple):
error_reason = virtual[1]
virtual = virtual[0]
if self.opts.get("virtual_timer", False):
end = time.time() - start
msg = "Virtual function took {} seconds for {}".format(
end, module_name
)
log.warning(msg)
except Exception as exc: # pylint: disable=broad-except
error_reason = (
"Exception raised when processing __virtual__ function"
" for {}. Module will not be loaded: {}".format(
mod.__name__, exc
)
)
log.error(error_reason, exc_info_on_loglevel=logging.DEBUG)
virtual = None
# Get the module's virtual name
virtualname = getattr(mod, "__virtualname__", virtual)
if not virtual:
# if __virtual__() evaluates to False then the module
# wasn't meant for this platform or it's not supposed to
# load for some other reason.
# Some modules might accidentally return None and are
# improperly loaded
if virtual is None:
log.warning(
"%s.__virtual__() is wrongly returning `None`. "
"It should either return `True`, `False` or a new "
"name. If you're the developer of the module "
"'%s', please fix this.",
mod.__name__,
module_name,
)
return (False, module_name, error_reason, virtual_aliases)
# At this point, __virtual__ did not return a
# boolean value, let's check for deprecated usage
# or module renames
if virtual is not True and module_name != virtual:
# The module is renaming itself. Updating the module name
# with the new name
log.trace("Loaded %s as virtual %s", module_name, virtual)
if virtualname != virtual:
# The __virtualname__ attribute does not match what's
# being returned by the __virtual__() function. This
# should be considered an error.
log.error(
"The module '%s' is showing some bad usage. Its "
"__virtualname__ attribute is set to '%s' yet the "
"__virtual__() function is returning '%s'. These "
"values should match!",
mod.__name__,
virtualname,
virtual,
)
module_name = virtualname
# If the __virtual__ function returns True and __virtualname__
# is set then use it
elif virtual is True and virtualname != module_name:
if virtualname is not True:
module_name = virtualname
except KeyError:
# Key errors come out of the virtual function when passing
# in incomplete grains sets, these can be safely ignored
# and logged to debug, still, it includes the traceback to
# help debugging.
log.debug("KeyError when loading %s", module_name, exc_info=True)
except Exception: # pylint: disable=broad-except
# If the module throws an exception during __virtual__()
# then log the information and continue to the next.
log.error(
"Failed to read the virtual function for %s: %s",
self.tag,
module_name,
exc_info=True,
)
return (False, module_name, error_reason, virtual_aliases)
return (True, module_name, None, virtual_aliases)
def run(self, _func_or_method, *args, **kwargs):
"""
Run the `_func_or_method` in this loader's context
"""
self._last_context = contextvars.copy_context()
return self._last_context.run(self._run_as, _func_or_method, *args, **kwargs)
def _run_as(self, _func_or_method, *args, **kwargs):
"""
Handle setting up the context properly and call the method
"""
self.parent_loader = None
try:
current_loader = salt.loader.context.loader_ctxvar.get()
except LookupError:
current_loader = None
if current_loader is not self:
self.parent_loader = current_loader
token = salt.loader.context.loader_ctxvar.set(self)
try:
return _func_or_method(*args, **kwargs)
finally:
self.parent_loader = None
salt.loader.context.loader_ctxvar.reset(token)
def run_in_thread(self, _func_or_method, *args, **kwargs):
"""
Run the function in a new thread with the context of this loader
"""
argslist = [self, _func_or_method]
argslist.extend(args)
thread = threading.Thread(target=self.target, args=argslist, kwargs=kwargs)
thread.start()
return thread
@staticmethod
def target(loader, _func_or_method, *args, **kwargs):
loader.run(_func_or_method, *args, **kwargs)
def global_injector_decorator(inject_globals):
"""
Decorator used by the LazyLoader to inject globals into a function at
execute time.
globals
Dictionary with global variables to inject
"""
def inner_decorator(f):
@functools.wraps(f)
def wrapper(*args, **kwargs):
with salt.utils.context.func_globals_inject(f, **inject_globals):
return f(*args, **kwargs)
return wrapper
return inner_decorator
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