X-Git-Url: https://wannabe.guru.org/gitweb/?a=blobdiff_plain;f=bootstrap.py;h=03bb505c6d3a1aed2a6177aba4fc3565d538fd17;hb=eb9e6df32ed696158bf34dba6464277b648f5c74;hp=3489b8a7583ea8551fb1d78d1aa270250a1d7b32;hpb=4faa994d32223c8d560d9dad0ca90a3f7eb10d6a;p=python_utils.git diff --git a/bootstrap.py b/bootstrap.py index 3489b8a..03bb505 100644 --- a/bootstrap.py +++ b/bootstrap.py @@ -1,8 +1,10 @@ #!/usr/bin/env python3 import functools +import importlib import logging import os +from inspect import stack import sys # This module is commonly used by others in here and should avoid @@ -37,11 +39,28 @@ args.add_argument( metavar='SEED_INT', help='Override the global random seed with a particular number.' ) +args.add_argument( + '--dump_all_objects', + action=ActionNoYes, + default=False, + help='Should we dump the Python import tree before main?' +) +args.add_argument( + '--audit_import_events', + action=ActionNoYes, + default=False, + help='Should we audit all import events?', +) -original_hook = sys.excepthook +original_hook = sys.excepthook def handle_uncaught_exception(exc_type, exc_value, exc_tb): + """ + Top-level exception handler for exceptions that make it past any exception + handlers in the python code being run. Logs the error and stacktrace then + maybe attaches a debugger. + """ global original_hook msg = f'Unhandled top level exception {exc_type}' logger.exception(msg) @@ -57,24 +76,148 @@ def handle_uncaught_exception(exc_type, exc_value, exc_tb): # stdin or stderr is redirected, just do the normal thing original_hook(exc_type, exc_value, exc_tb) else: - # a terminal is attached and stderr is not redirected, debug. + # a terminal is attached and stderr is not redirected, maybe debug. + import traceback + traceback.print_exception(exc_type, exc_value, exc_tb) if config.config['debug_unhandled_exceptions']: - import traceback import pdb - traceback.print_exception(exc_type, exc_value, exc_tb) logger.info("Invoking the debugger...") pdb.pm() else: original_hook(exc_type, exc_value, exc_tb) +class ImportInterceptor(object): + def __init__(self): + import collect.trie + self.module_by_filename_cache = {} + self.repopulate_modules_by_filename() + self.tree = collect.trie.Trie() + self.tree_node_by_module = {} + + def repopulate_modules_by_filename(self): + self.module_by_filename_cache.clear() + for mod in sys.modules: + if hasattr(sys.modules[mod], '__file__'): + fname = getattr(sys.modules[mod], '__file__') + else: + fname = 'unknown' + self.module_by_filename_cache[fname] = mod + + def should_ignore_filename(self, filename: str) -> bool: + return 'importlib' in filename or 'six.py' in filename + + def find_spec(self, loaded_module, path=None, target=None): + s = stack() + for x in range(3, len(s)): + filename = s[x].filename + if self.should_ignore_filename(filename): + continue + + loading_function = s[x].function + if filename in self.module_by_filename_cache: + loading_module = self.module_by_filename_cache[filename] + else: + self.repopulate_modules_by_filename() + loading_module = self.module_by_filename_cache.get(filename, 'unknown') + + path = self.tree_node_by_module.get(loading_module, []) + path.extend([loaded_module]) + self.tree.insert(path) + self.tree_node_by_module[loading_module] = path + + msg = f'*** Import {loaded_module} from {filename}:{s[x].lineno} in {loading_module}::{loading_function}' + logger.debug(msg) + print(msg) + return + msg = f'*** Import {loaded_module} from ?????' + logger.debug(msg) + print(msg) + + def find_importer(self, module: str): + if module in self.tree_node_by_module: + node = self.tree_node_by_module[module] + return node + return [] + + +# TODO: test this with python 3.8+ +def audit_import_events(event, args): + print(event) + print(args) + + +# Audit import events? Note: this runs early in the lifetime of the +# process (assuming that import bootstrap happens early); config has +# (probably) not yet been loaded or parsed the commandline. Also, +# some things have probably already been imported while we weren't +# watching so this information may be incomplete. +# +# Also note: move bootstrap up in the global import list to catch +# more import events and have a more complete record. +import_interceptor = None +for arg in sys.argv: + if arg == '--audit_import_events': + if not hasattr(sys, 'frozen'): + if ( + sys.version_info[0] == 3 + and sys.version_info[1] < 8 + ): + import_interceptor = ImportInterceptor() + sys.meta_path = [import_interceptor] + sys.meta_path + else: + sys.addaudithook(audit_import_events) + + +def dump_all_objects() -> None: + global import_interceptor + messages = {} + all_modules = sys.modules + for obj in object.__subclasses__(): + if not hasattr(obj, '__name__'): + continue + klass = obj.__name__ + if not hasattr(obj, '__module__'): + continue + class_mod_name = obj.__module__ + if class_mod_name in all_modules: + mod = all_modules[class_mod_name] + if not hasattr(mod, '__name__'): + mod_name = class_mod_name + else: + mod_name = mod.__name__ + if hasattr(mod, '__file__'): + mod_file = mod.__file__ + else: + mod_file = 'unknown' + if import_interceptor is not None: + import_path = import_interceptor.find_importer(mod_name) + else: + import_path = 'unknown' + msg = f'{class_mod_name}::{klass} ({mod_file})' + if import_path != 'unknown' and len(import_path) > 0: + msg += f' imported by {import_path}' + messages[f'{class_mod_name}::{klass}'] = msg + for x in sorted(messages.keys()): + logger.debug(messages[x]) + print(messages[x]) + + def initialize(entry_point): + """ + Remember to initialize config, initialize logging, set/log a random + seed, etc... before running main. - """Remember to initialize config and logging before running main.""" + """ @functools.wraps(entry_point) def initialize_wrapper(*args, **kwargs): + # Hook top level unhandled exceptions, maybe invoke debugger. if sys.excepthook == sys.__excepthook__: sys.excepthook = handle_uncaught_exception + + # Try to figure out the name of the program entry point. Then + # parse configuration (based on cmdline flags, environment vars + # etc...) if ( '__globals__' in entry_point.__dict__ and '__file__' in entry_point.__globals__ @@ -83,8 +226,9 @@ def initialize(entry_point): else: config.parse(None) + # Initialize logging... and log some remembered messages from + # config module. logging_utils.initialize_logging(logging.getLogger()) - config.late_logging() # Allow programs that don't bother to override the random seed @@ -98,12 +242,12 @@ def initialize(entry_point): if config.config['show_random_seed']: msg = f'Global random seed is: {random_seed}' - print(msg) logger.debug(msg) + print(msg) random.seed(random_seed) + # Do it, invoke the user's code. Pay attention to how long it takes. logger.debug(f'Starting {entry_point.__name__} (program entry point)') - ret = None import stopwatch with stopwatch.Timer() as t: @@ -112,6 +256,14 @@ def initialize(entry_point): f'{entry_point.__name__} (program entry point) returned {ret}.' ) + if config.config['dump_all_objects']: + dump_all_objects() + + if config.config['audit_import_events']: + global import_interceptor + if import_interceptor is not None: + print(import_interceptor.tree) + walltime = t() (utime, stime, cutime, cstime, elapsed_time) = os.times() logger.debug('\n' @@ -121,8 +273,10 @@ def initialize(entry_point): f'child system: {cstime}s\n' f'machine uptime: {elapsed_time}s\n' f'walltime: {walltime}s') - if ret != 0: - logger.info(f'Exit {ret}') + + # If it doesn't return cleanly, call attention to the return value. + if ret is not None and ret != 0: + logger.error(f'Exit {ret}') else: logger.debug(f'Exit {ret}') sys.exit(ret)