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inorout.py
# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 # For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt """Determining whether files are being measured/reported or not.""" from __future__ import annotations import importlib.util import inspect import itertools import os import platform import re import sys import sysconfig import traceback from types import FrameType, ModuleType from typing import ( cast, Any, Iterable, List, Optional, Set, Tuple, Type, TYPE_CHECKING, ) from coverage import env from coverage.disposition import FileDisposition, disposition_init from coverage.exceptions import CoverageException, PluginError from coverage.files import TreeMatcher, GlobMatcher, ModuleMatcher from coverage.files import prep_patterns, find_python_files, canonical_filename from coverage.misc import sys_modules_saved from coverage.python import source_for_file, source_for_morf from coverage.types import TFileDisposition, TMorf, TWarnFn, TDebugCtl if TYPE_CHECKING: from coverage.config import CoverageConfig from coverage.plugin_support import Plugins # Pypy has some unusual stuff in the "stdlib". Consider those locations # when deciding where the stdlib is. These modules are not used for anything, # they are modules importable from the pypy lib directories, so that we can # find those directories. modules_we_happen_to_have: List[ModuleType] = [ inspect, itertools, os, platform, re, sysconfig, traceback, ] if env.PYPY: try: import _structseq modules_we_happen_to_have.append(_structseq) except ImportError: pass try: import _pypy_irc_topic modules_we_happen_to_have.append(_pypy_irc_topic) except ImportError: pass def canonical_path(morf: TMorf, directory: bool = False) -> str: """Return the canonical path of the module or file `morf`. If the module is a package, then return its directory. If it is a module, then return its file, unless `directory` is True, in which case return its enclosing directory. """ morf_path = canonical_filename(source_for_morf(morf)) if morf_path.endswith("__init__.py") or directory: morf_path = os.path.split(morf_path)[0] return morf_path def name_for_module(filename: str, frame: Optional[FrameType]) -> str: """Get the name of the module for a filename and frame. For configurability's sake, we allow __main__ modules to be matched by their importable name. If loaded via runpy (aka -m), we can usually recover the "original" full dotted module name, otherwise, we resort to interpreting the file name to get the module's name. In the case that the module name can't be determined, None is returned. """ module_globals = frame.f_globals if frame is not None else {} dunder_name: str = module_globals.get("__name__", None) if isinstance(dunder_name, str) and dunder_name != "__main__": # This is the usual case: an imported module. return dunder_name loader = module_globals.get("__loader__", None) for attrname in ("fullname", "name"): # attribute renamed in py3.2 if hasattr(loader, attrname): fullname = getattr(loader, attrname) else: continue if isinstance(fullname, str) and fullname != "__main__": # Module loaded via: runpy -m return fullname # Script as first argument to Python command line. inspectedname = inspect.getmodulename(filename) if inspectedname is not None: return inspectedname else: return dunder_name def module_is_namespace(mod: ModuleType) -> bool: """Is the module object `mod` a PEP420 namespace module?""" return hasattr(mod, "__path__") and getattr(mod, "__file__", None) is None def module_has_file(mod: ModuleType) -> bool: """Does the module object `mod` have an existing __file__ ?""" mod__file__ = getattr(mod, "__file__", None) if mod__file__ is None: return False return os.path.exists(mod__file__) def file_and_path_for_module(modulename: str) -> Tuple[Optional[str], List[str]]: """Find the file and search path for `modulename`. Returns: filename: The filename of the module, or None. path: A list (possibly empty) of directories to find submodules in. """ filename = None path = [] try: spec = importlib.util.find_spec(modulename) except Exception: pass else: if spec is not None: filename = spec.origin path = list(spec.submodule_search_locations or ()) return filename, path def add_stdlib_paths(paths: Set[str]) -> None: """Add paths where the stdlib can be found to the set `paths`.""" # Look at where some standard modules are located. That's the # indication for "installed with the interpreter". In some # environments (virtualenv, for example), these modules may be # spread across a few locations. Look at all the candidate modules # we've imported, and take all the different ones. for m in modules_we_happen_to_have: if hasattr(m, "__file__"): paths.add(canonical_path(m, directory=True)) def add_third_party_paths(paths: Set[str]) -> None: """Add locations for third-party packages to the set `paths`.""" # Get the paths that sysconfig knows about. scheme_names = set(sysconfig.get_scheme_names()) for scheme in scheme_names: # https://foss.heptapod.net/pypy/pypy/-/issues/3433 better_scheme = "pypy_posix" if scheme == "pypy" else scheme if os.name in better_scheme.split("_"): config_paths = sysconfig.get_paths(scheme) for path_name in ["platlib", "purelib", "scripts"]: paths.add(config_paths[path_name]) def add_coverage_paths(paths: Set[str]) -> None: """Add paths where coverage.py code can be found to the set `paths`.""" cover_path = canonical_path(__file__, directory=True) paths.add(cover_path) if env.TESTING: # Don't include our own test code. paths.add(os.path.join(cover_path, "tests")) class InOrOut: """Machinery for determining what files to measure.""" def __init__( self, config: CoverageConfig, warn: TWarnFn, debug: Optional[TDebugCtl], include_namespace_packages: bool, ) -> None: self.warn = warn self.debug = debug self.include_namespace_packages = include_namespace_packages self.source: List[str] = [] self.source_pkgs: List[str] = [] self.source_pkgs.extend(config.source_pkgs) for src in config.source or []: if os.path.isdir(src): self.source.append(canonical_filename(src)) else: self.source_pkgs.append(src) self.source_pkgs_unmatched = self.source_pkgs[:] self.include = prep_patterns(config.run_include) self.omit = prep_patterns(config.run_omit) # The directories for files considered "installed with the interpreter". self.pylib_paths: Set[str] = set() if not config.cover_pylib: add_stdlib_paths(self.pylib_paths) # To avoid tracing the coverage.py code itself, we skip anything # located where we are. self.cover_paths: Set[str] = set() add_coverage_paths(self.cover_paths) # Find where third-party packages are installed. self.third_paths: Set[str] = set() add_third_party_paths(self.third_paths) def _debug(msg: str) -> None: if self.debug: self.debug.write(msg) # The matchers for should_trace. # Generally useful information _debug("sys.path:" + "".join(f"\n {p}" for p in sys.path)) # Create the matchers we need for should_trace self.source_match = None self.source_pkgs_match = None self.pylib_match = None self.include_match = self.omit_match = None if self.source or self.source_pkgs: against = [] if self.source: self.source_match = TreeMatcher(self.source, "source") against.append(f"trees {self.source_match!r}") if self.source_pkgs: self.source_pkgs_match = ModuleMatcher(self.source_pkgs, "source_pkgs") against.append(f"modules {self.source_pkgs_match!r}") _debug("Source matching against " + " and ".join(against)) else: if self.pylib_paths: self.pylib_match = TreeMatcher(self.pylib_paths, "pylib") _debug(f"Python stdlib matching: {self.pylib_match!r}") if self.include: self.include_match = GlobMatcher(self.include, "include") _debug(f"Include matching: {self.include_match!r}") if self.omit: self.omit_match = GlobMatcher(self.omit, "omit") _debug(f"Omit matching: {self.omit_match!r}") self.cover_match = TreeMatcher(self.cover_paths, "coverage") _debug(f"Coverage code matching: {self.cover_match!r}") self.third_match = TreeMatcher(self.third_paths, "third") _debug(f"Third-party lib matching: {self.third_match!r}") # Check if the source we want to measure has been installed as a # third-party package. # Is the source inside a third-party area? self.source_in_third_paths = set() with sys_modules_saved(): for pkg in self.source_pkgs: try: modfile, path = file_and_path_for_module(pkg) _debug(f"Imported source package {pkg!r} as {modfile!r}") except CoverageException as exc: _debug(f"Couldn't import source package {pkg!r}: {exc}") continue if modfile: if self.third_match.match(modfile): _debug( f"Source in third-party: source_pkg {pkg!r} at {modfile!r}" ) self.source_in_third_paths.add(canonical_path(source_for_file(modfile))) else: for pathdir in path: if self.third_match.match(pathdir): _debug( f"Source in third-party: {pkg!r} path directory at {pathdir!r}" ) self.source_in_third_paths.add(pathdir) for src in self.source: if self.third_match.match(src): _debug(f"Source in third-party: source directory {src!r}") self.source_in_third_paths.add(src) self.source_in_third_match = TreeMatcher(self.source_in_third_paths, "source_in_third") _debug(f"Source in third-party matching: {self.source_in_third_match}") self.plugins: Plugins self.disp_class: Type[TFileDisposition] = FileDisposition def should_trace(self, filename: str, frame: Optional[FrameType] = None) -> TFileDisposition: """Decide whether to trace execution in `filename`, with a reason. This function is called from the trace function. As each new file name is encountered, this function determines whether it is traced or not. Returns a FileDisposition object. """ original_filename = filename disp = disposition_init(self.disp_class, filename) def nope(disp: TFileDisposition, reason: str) -> TFileDisposition: """Simple helper to make it easy to return NO.""" disp.trace = False disp.reason = reason return disp if original_filename.startswith("<"): return nope(disp, "original file name is not real") if frame is not None: # Compiled Python files have two file names: frame.f_code.co_filename is # the file name at the time the .pyc was compiled. The second name is # __file__, which is where the .pyc was actually loaded from. Since # .pyc files can be moved after compilation (for example, by being # installed), we look for __file__ in the frame and prefer it to the # co_filename value. dunder_file = frame.f_globals and frame.f_globals.get("__file__") if dunder_file: filename = source_for_file(dunder_file) if original_filename and not original_filename.startswith("<"): orig = os.path.basename(original_filename) if orig != os.path.basename(filename): # Files shouldn't be renamed when moved. This happens when # exec'ing code. If it seems like something is wrong with # the frame's file name, then just use the original. filename = original_filename if not filename: # Empty string is pretty useless. return nope(disp, "empty string isn't a file name") if filename.startswith("memory:"): return nope(disp, "memory isn't traceable") if filename.startswith("<"): # Lots of non-file execution is represented with artificial # file names like "<string>", "<doctest readme.txt[0]>", or # "<exec_function>". Don't ever trace these executions, since we # can't do anything with the data later anyway. return nope(disp, "file name is not real") canonical = canonical_filename(filename) disp.canonical_filename = canonical # Try the plugins, see if they have an opinion about the file. plugin = None for plugin in self.plugins.file_tracers: if not plugin._coverage_enabled: continue try: file_tracer = plugin.file_tracer(canonical) if file_tracer is not None: file_tracer._coverage_plugin = plugin disp.trace = True disp.file_tracer = file_tracer if file_tracer.has_dynamic_source_filename(): disp.has_dynamic_filename = True else: disp.source_filename = canonical_filename( file_tracer.source_filename() ) break except Exception: plugin_name = plugin._coverage_plugin_name tb = traceback.format_exc() self.warn(f"Disabling plug-in {plugin_name!r} due to an exception:\n{tb}") plugin._coverage_enabled = False continue else: # No plugin wanted it: it's Python. disp.trace = True disp.source_filename = canonical if not disp.has_dynamic_filename: if not disp.source_filename: raise PluginError( f"Plugin {plugin!r} didn't set source_filename for '{disp.original_filename}'" ) reason = self.check_include_omit_etc(disp.source_filename, frame) if reason: nope(disp, reason) return disp def check_include_omit_etc(self, filename: str, frame: Optional[FrameType]) -> Optional[str]: """Check a file name against the include, omit, etc, rules. Returns a string or None. String means, don't trace, and is the reason why. None means no reason found to not trace. """ modulename = name_for_module(filename, frame) # If the user specified source or include, then that's authoritative # about the outer bound of what to measure and we don't have to apply # any canned exclusions. If they didn't, then we have to exclude the # stdlib and coverage.py directories. if self.source_match or self.source_pkgs_match: extra = "" ok = False if self.source_pkgs_match: if self.source_pkgs_match.match(modulename): ok = True if modulename in self.source_pkgs_unmatched: self.source_pkgs_unmatched.remove(modulename) else: extra = f"module {modulename!r} " if not ok and self.source_match: if self.source_match.match(filename): ok = True if not ok: return extra + "falls outside the --source spec" if self.third_match.match(filename) and not self.source_in_third_match.match(filename): return "inside --source, but is third-party" elif self.include_match: if not self.include_match.match(filename): return "falls outside the --include trees" else: # We exclude the coverage.py code itself, since a little of it # will be measured otherwise. if self.cover_match.match(filename): return "is part of coverage.py" # If we aren't supposed to trace installed code, then check if this # is near the Python standard library and skip it if so. if self.pylib_match and self.pylib_match.match(filename): return "is in the stdlib" # Exclude anything in the third-party installation areas. if self.third_match.match(filename): return "is a third-party module" # Check the file against the omit pattern. if self.omit_match and self.omit_match.match(filename): return "is inside an --omit pattern" # No point tracing a file we can't later write to SQLite. try: filename.encode("utf-8") except UnicodeEncodeError: return "non-encodable filename" # No reason found to skip this file. return None def warn_conflicting_settings(self) -> None: """Warn if there are settings that conflict.""" if self.include: if self.source or self.source_pkgs: self.warn("--include is ignored because --source is set", slug="include-ignored") def warn_already_imported_files(self) -> None: """Warn if files have already been imported that we will be measuring.""" if self.include or self.source or self.source_pkgs: warned = set() for mod in list(sys.modules.values()): filename = getattr(mod, "__file__", None) if filename is None: continue if filename in warned: continue if len(getattr(mod, "__path__", ())) > 1: # A namespace package, which confuses this code, so ignore it. continue disp = self.should_trace(filename) if disp.has_dynamic_filename: # A plugin with dynamic filenames: the Python file # shouldn't cause a warning, since it won't be the subject # of tracing anyway. continue if disp.trace: msg = f"Already imported a file that will be measured: {filename}" self.warn(msg, slug="already-imported") warned.add(filename) elif self.debug and self.debug.should("trace"): self.debug.write( "Didn't trace already imported file {!r}: {}".format( disp.original_filename, disp.reason ) ) def warn_unimported_source(self) -> None: """Warn about source packages that were of interest, but never traced.""" for pkg in self.source_pkgs_unmatched: self._warn_about_unmeasured_code(pkg) def _warn_about_unmeasured_code(self, pkg: str) -> None: """Warn about a package or module that we never traced. `pkg` is a string, the name of the package or module. """ mod = sys.modules.get(pkg) if mod is None: self.warn(f"Module {pkg} was never imported.", slug="module-not-imported") return if module_is_namespace(mod): # A namespace package. It's OK for this not to have been traced, # since there is no code directly in it. return if not module_has_file(mod): self.warn(f"Module {pkg} has no Python source.", slug="module-not-python") return # The module was in sys.modules, and seems like a module with code, but # we never measured it. I guess that means it was imported before # coverage even started. msg = f"Module {pkg} was previously imported, but not measured" self.warn(msg, slug="module-not-measured") def find_possibly_unexecuted_files(self) -> Iterable[Tuple[str, Optional[str]]]: """Find files in the areas of interest that might be untraced. Yields pairs: file path, and responsible plug-in name. """ for pkg in self.source_pkgs: if (pkg not in sys.modules or not module_has_file(sys.modules[pkg])): continue pkg_file = source_for_file(cast(str, sys.modules[pkg].__file__)) yield from self._find_executable_files(canonical_path(pkg_file)) for src in self.source: yield from self._find_executable_files(src) def _find_plugin_files(self, src_dir: str) -> Iterable[Tuple[str, str]]: """Get executable files from the plugins.""" for plugin in self.plugins.file_tracers: for x_file in plugin.find_executable_files(src_dir): yield x_file, plugin._coverage_plugin_name def _find_executable_files(self, src_dir: str) -> Iterable[Tuple[str, Optional[str]]]: """Find executable files in `src_dir`. Search for files in `src_dir` that can be executed because they are probably importable. Don't include ones that have been omitted by the configuration. Yield the file path, and the plugin name that handles the file. """ py_files = ( (py_file, None) for py_file in find_python_files(src_dir, self.include_namespace_packages) ) plugin_files = self._find_plugin_files(src_dir) for file_path, plugin_name in itertools.chain(py_files, plugin_files): file_path = canonical_filename(file_path) if self.omit_match and self.omit_match.match(file_path): # Turns out this file was omitted, so don't pull it back # in as un-executed. continue yield file_path, plugin_name def sys_info(self) -> Iterable[Tuple[str, Any]]: """Our information for Coverage.sys_info. Returns a list of (key, value) pairs. """ info = [ ("coverage_paths", self.cover_paths), ("stdlib_paths", self.pylib_paths), ("third_party_paths", self.third_paths), ("source_in_third_party_paths", self.source_in_third_paths), ] matcher_names = [ "source_match", "source_pkgs_match", "include_match", "omit_match", "cover_match", "pylib_match", "third_match", "source_in_third_match", ] for matcher_name in matcher_names: matcher = getattr(self, matcher_name) if matcher: matcher_info = matcher.info() else: matcher_info = "-none-" info.append((matcher_name, matcher_info)) return info
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