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1206 lines (954 loc) · 38.9 KB
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# utils.py
# Copyright (C) 2008, 2009 Michael Trier (mtrier@gmail.com) and contributors
#
# This module is part of GitPython and is released under
# the BSD License: http://www.opensource.org/licenses/bsd-license.php
from abc import abstractmethod
import os.path as osp
from .compat import is_win
import contextlib
from functools import wraps
import getpass
import logging
import os
import platform
import subprocess
import re
import shutil
import stat
from sys import maxsize
import time
from urllib.parse import urlsplit, urlunsplit
import warnings
# from git.objects.util import Traversable
# typing ---------------------------------------------------------
from typing import (
Any,
AnyStr,
BinaryIO,
Callable,
Dict,
Generator,
IO,
Iterator,
List,
Optional,
Pattern,
Sequence,
Tuple,
TypeVar,
Union,
cast,
TYPE_CHECKING,
overload,
)
import pathlib
if TYPE_CHECKING:
from git.remote import Remote
from git.repo.base import Repo
from git.config import GitConfigParser, SectionConstraint
from git import Git
# from git.objects.base import IndexObject
from .types import (
Literal,
SupportsIndex,
Protocol,
runtime_checkable, # because behind py version guards
PathLike,
HSH_TD,
Total_TD,
Files_TD, # aliases
Has_id_attribute,
)
T_IterableObj = TypeVar("T_IterableObj", bound=Union["IterableObj", "Has_id_attribute"], covariant=True)
# So IterableList[Head] is subtype of IterableList[IterableObj]
# ---------------------------------------------------------------------
from gitdb.util import ( # NOQA @IgnorePep8
make_sha,
LockedFD, # @UnusedImport
file_contents_ro, # @UnusedImport
file_contents_ro_filepath, # @UnusedImport
LazyMixin, # @UnusedImport
to_hex_sha, # @UnusedImport
to_bin_sha, # @UnusedImport
bin_to_hex, # @UnusedImport
hex_to_bin, # @UnusedImport
)
# NOTE: Some of the unused imports might be used/imported by others.
# Handle once test-cases are back up and running.
# Most of these are unused here, but are for use by git-python modules so these
# don't see gitdb all the time. Flake of course doesn't like it.
__all__ = [
"stream_copy",
"join_path",
"to_native_path_linux",
"join_path_native",
"Stats",
"IndexFileSHA1Writer",
"IterableObj",
"IterableList",
"BlockingLockFile",
"LockFile",
"Actor",
"get_user_id",
"assure_directory_exists",
"RemoteProgress",
"CallableRemoteProgress",
"rmtree",
"unbare_repo",
"HIDE_WINDOWS_KNOWN_ERRORS",
]
log = logging.getLogger(__name__)
# types############################################################
#: We need an easy way to see if Appveyor TCs start failing,
#: so the errors marked with this var are considered "acknowledged" ones, awaiting remedy,
#: till then, we wish to hide them.
HIDE_WINDOWS_KNOWN_ERRORS = is_win and os.environ.get("HIDE_WINDOWS_KNOWN_ERRORS", True)
HIDE_WINDOWS_FREEZE_ERRORS = is_win and os.environ.get("HIDE_WINDOWS_FREEZE_ERRORS", True)
# { Utility Methods
T = TypeVar("T")
def unbare_repo(func: Callable[..., T]) -> Callable[..., T]:
"""Methods with this decorator raise :class:`.exc.InvalidGitRepositoryError` if they
encounter a bare repository"""
from .exc import InvalidGitRepositoryError
@wraps(func)
def wrapper(self: "Remote", *args: Any, **kwargs: Any) -> T:
if self.repo.bare:
raise InvalidGitRepositoryError("Method '%s' cannot operate on bare repositories" % func.__name__)
# END bare method
return func(self, *args, **kwargs)
# END wrapper
return wrapper
@contextlib.contextmanager
def cwd(new_dir: PathLike) -> Generator[PathLike, None, None]:
old_dir = os.getcwd()
os.chdir(new_dir)
try:
yield new_dir
finally:
os.chdir(old_dir)
def rmtree(path: PathLike) -> None:
"""Remove the given recursively.
:note: we use shutil rmtree but adjust its behaviour to see whether files that
couldn't be deleted are read-only. Windows will not remove them in that case"""
def onerror(func: Callable, path: PathLike, exc_info: str) -> None:
# Is the error an access error ?
os.chmod(path, stat.S_IWUSR)
try:
func(path) # Will scream if still not possible to delete.
except Exception as ex:
if HIDE_WINDOWS_KNOWN_ERRORS:
from unittest import SkipTest
raise SkipTest("FIXME: fails with: PermissionError\n {}".format(ex)) from ex
raise
return shutil.rmtree(path, False, onerror)
def rmfile(path: PathLike) -> None:
"""Ensure file deleted also on *Windows* where read-only files need special treatment."""
if osp.isfile(path):
if is_win:
os.chmod(path, 0o777)
os.remove(path)
def stream_copy(source: BinaryIO, destination: BinaryIO, chunk_size: int = 512 * 1024) -> int:
"""Copy all data from the source stream into the destination stream in chunks
of size chunk_size
:return: amount of bytes written"""
br = 0
while True:
chunk = source.read(chunk_size)
destination.write(chunk)
br += len(chunk)
if len(chunk) < chunk_size:
break
# END reading output stream
return br
def join_path(a: PathLike, *p: PathLike) -> PathLike:
"""Join path tokens together similar to osp.join, but always use
'/' instead of possibly '\' on windows."""
path = str(a)
for b in p:
b = str(b)
if not b:
continue
if b.startswith("/"):
path += b[1:]
elif path == "" or path.endswith("/"):
path += b
else:
path += "/" + b
# END for each path token to add
return path
if is_win:
def to_native_path_windows(path: PathLike) -> PathLike:
path = str(path)
return path.replace("/", "\\")
def to_native_path_linux(path: PathLike) -> str:
path = str(path)
return path.replace("\\", "/")
__all__.append("to_native_path_windows")
to_native_path = to_native_path_windows
else:
# no need for any work on linux
def to_native_path_linux(path: PathLike) -> str:
return str(path)
to_native_path = to_native_path_linux
def join_path_native(a: PathLike, *p: PathLike) -> PathLike:
"""
As join path, but makes sure an OS native path is returned. This is only
needed to play it safe on my dear windows and to assure nice paths that only
use '\'"""
return to_native_path(join_path(a, *p))
def assure_directory_exists(path: PathLike, is_file: bool = False) -> bool:
"""Assure that the directory pointed to by path exists.
:param is_file: If True, path is assumed to be a file and handled correctly.
Otherwise it must be a directory
:return: True if the directory was created, False if it already existed"""
if is_file:
path = osp.dirname(path)
# END handle file
if not osp.isdir(path):
os.makedirs(path, exist_ok=True)
return True
return False
def _get_exe_extensions() -> Sequence[str]:
PATHEXT = os.environ.get("PATHEXT", None)
return (
tuple(p.upper() for p in PATHEXT.split(os.pathsep)) if PATHEXT else (".BAT", "COM", ".EXE") if is_win else ("")
)
def py_where(program: str, path: Optional[PathLike] = None) -> List[str]:
# From: http://stackoverflow.com/a/377028/548792
winprog_exts = _get_exe_extensions()
def is_exec(fpath: str) -> bool:
return (
osp.isfile(fpath)
and os.access(fpath, os.X_OK)
and (os.name != "nt" or not winprog_exts or any(fpath.upper().endswith(ext) for ext in winprog_exts))
)
progs = []
if not path:
path = os.environ["PATH"]
for folder in str(path).split(os.pathsep):
folder = folder.strip('"')
if folder:
exe_path = osp.join(folder, program)
for f in [exe_path] + ["%s%s" % (exe_path, e) for e in winprog_exts]:
if is_exec(f):
progs.append(f)
return progs
def _cygexpath(drive: Optional[str], path: str) -> str:
if osp.isabs(path) and not drive:
# Invoked from `cygpath()` directly with `D:Apps\123`?
# It's an error, leave it alone just slashes)
p = path # convert to str if AnyPath given
else:
p = path and osp.normpath(osp.expandvars(osp.expanduser(path)))
if osp.isabs(p):
if drive:
# Confusing, maybe a remote system should expand vars.
p = path
else:
p = cygpath(p)
elif drive:
p = "/proc/cygdrive/%s/%s" % (drive.lower(), p)
p_str = str(p) # ensure it is a str and not AnyPath
return p_str.replace("\\", "/")
_cygpath_parsers: Tuple[Tuple[Pattern[str], Callable, bool], ...] = (
# See: https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx
# and: https://www.cygwin.com/cygwin-ug-net/using.html#unc-paths
(
re.compile(r"\\\\\?\\UNC\\([^\\]+)\\([^\\]+)(?:\\(.*))?"),
(lambda server, share, rest_path: "//%s/%s/%s" % (server, share, rest_path.replace("\\", "/"))),
False,
),
(re.compile(r"\\\\\?\\(\w):[/\\](.*)"), (_cygexpath), False),
(re.compile(r"(\w):[/\\](.*)"), (_cygexpath), False),
(re.compile(r"file:(.*)", re.I), (lambda rest_path: rest_path), True),
(re.compile(r"(\w{2,}:.*)"), (lambda url: url), False), # remote URL, do nothing
)
def cygpath(path: str) -> str:
"""Use :meth:`git.cmd.Git.polish_url()` instead, that works on any environment."""
path = str(path) # ensure is str and not AnyPath.
# Fix to use Paths when 3.5 dropped. or to be just str if only for urls?
if not path.startswith(("/cygdrive", "//", "/proc/cygdrive")):
for regex, parser, recurse in _cygpath_parsers:
match = regex.match(path)
if match:
path = parser(*match.groups())
if recurse:
path = cygpath(path)
break
else:
path = _cygexpath(None, path)
return path
_decygpath_regex = re.compile(r"(?:/proc)?/cygdrive/(\w)(/.*)?")
def decygpath(path: PathLike) -> str:
path = str(path)
m = _decygpath_regex.match(path)
if m:
drive, rest_path = m.groups()
path = "%s:%s" % (drive.upper(), rest_path or "")
return path.replace("/", "\\")
#: Store boolean flags denoting if a specific Git executable
#: is from a Cygwin installation (since `cache_lru()` unsupported on PY2).
_is_cygwin_cache: Dict[str, Optional[bool]] = {}
@overload
def is_cygwin_git(git_executable: None) -> Literal[False]:
...
@overload
def is_cygwin_git(git_executable: PathLike) -> bool:
...
def is_cygwin_git(git_executable: Union[None, PathLike]) -> bool:
if is_win:
# is_win seems to be true only for Windows-native pythons
# cygwin has os.name = posix, I think
return False
if git_executable is None:
return False
git_executable = str(git_executable)
is_cygwin = _is_cygwin_cache.get(git_executable) # type: Optional[bool]
if is_cygwin is None:
is_cygwin = False
try:
git_dir = osp.dirname(git_executable)
if not git_dir:
res = py_where(git_executable)
git_dir = osp.dirname(res[0]) if res else ""
# Just a name given, not a real path.
uname_cmd = osp.join(git_dir, "uname")
process = subprocess.Popen([uname_cmd], stdout=subprocess.PIPE, universal_newlines=True)
uname_out, _ = process.communicate()
# retcode = process.poll()
is_cygwin = "CYGWIN" in uname_out
except Exception as ex:
log.debug("Failed checking if running in CYGWIN due to: %r", ex)
_is_cygwin_cache[git_executable] = is_cygwin
return is_cygwin
def get_user_id() -> str:
""":return: string identifying the currently active system user as name@node"""
return "%s@%s" % (getpass.getuser(), platform.node())
def finalize_process(proc: Union[subprocess.Popen, "Git.AutoInterrupt"], **kwargs: Any) -> None:
"""Wait for the process (clone, fetch, pull or push) and handle its errors accordingly"""
# TODO: No close proc-streams??
proc.wait(**kwargs)
@overload
def expand_path(p: None, expand_vars: bool = ...) -> None:
...
@overload
def expand_path(p: PathLike, expand_vars: bool = ...) -> str:
# improve these overloads when 3.5 dropped
...
def expand_path(p: Union[None, PathLike], expand_vars: bool = True) -> Optional[PathLike]:
if isinstance(p, pathlib.Path):
return p.resolve()
try:
p = osp.expanduser(p) # type: ignore
if expand_vars:
p = osp.expandvars(p) # type: ignore
return osp.normpath(osp.abspath(p)) # type: ignore
except Exception:
return None
def remove_password_if_present(cmdline: Sequence[str]) -> List[str]:
"""
Parse any command line argument and if on of the element is an URL with a
username and/or password, replace them by stars (in-place).
If nothing found just returns the command line as-is.
This should be used for every log line that print a command line, as well as
exception messages.
"""
new_cmdline = []
for index, to_parse in enumerate(cmdline):
new_cmdline.append(to_parse)
try:
url = urlsplit(to_parse)
# Remove password from the URL if present
if url.password is None and url.username is None:
continue
if url.password is not None:
url = url._replace(netloc=url.netloc.replace(url.password, "*****"))
if url.username is not None:
url = url._replace(netloc=url.netloc.replace(url.username, "*****"))
new_cmdline[index] = urlunsplit(url)
except ValueError:
# This is not a valid URL
continue
return new_cmdline
# } END utilities
# { Classes
class RemoteProgress(object):
"""
Handler providing an interface to parse progress information emitted by git-push
and git-fetch and to dispatch callbacks allowing subclasses to react to the progress.
"""
_num_op_codes: int = 9
(
BEGIN,
END,
COUNTING,
COMPRESSING,
WRITING,
RECEIVING,
RESOLVING,
FINDING_SOURCES,
CHECKING_OUT,
) = [1 << x for x in range(_num_op_codes)]
STAGE_MASK = BEGIN | END
OP_MASK = ~STAGE_MASK
DONE_TOKEN = "done."
TOKEN_SEPARATOR = ", "
__slots__ = (
"_cur_line",
"_seen_ops",
"error_lines", # Lines that started with 'error:' or 'fatal:'.
"other_lines",
) # Lines not denoting progress (i.e.g. push-infos).
re_op_absolute = re.compile(r"(remote: )?([\w\s]+):\s+()(\d+)()(.*)")
re_op_relative = re.compile(r"(remote: )?([\w\s]+):\s+(\d+)% \((\d+)/(\d+)\)(.*)")
def __init__(self) -> None:
self._seen_ops: List[int] = []
self._cur_line: Optional[str] = None
self.error_lines: List[str] = []
self.other_lines: List[str] = []
def _parse_progress_line(self, line: AnyStr) -> None:
"""Parse progress information from the given line as retrieved by git-push
or git-fetch.
- Lines that do not contain progress info are stored in :attr:`other_lines`.
- Lines that seem to contain an error (i.e. start with error: or fatal:) are stored
in :attr:`error_lines`."""
# handle
# Counting objects: 4, done.
# Compressing objects: 50% (1/2)
# Compressing objects: 100% (2/2)
# Compressing objects: 100% (2/2), done.
if isinstance(line, bytes): # mypy argues about ternary assignment
line_str = line.decode("utf-8")
else:
line_str = line
self._cur_line = line_str
if self._cur_line.startswith(("error:", "fatal:")):
self.error_lines.append(self._cur_line)
return
# find escape characters and cut them away - regex will not work with
# them as they are non-ascii. As git might expect a tty, it will send them
last_valid_index = None
for i, c in enumerate(reversed(line_str)):
if ord(c) < 32:
# its a slice index
last_valid_index = -i - 1
# END character was non-ascii
# END for each character in line
if last_valid_index is not None:
line_str = line_str[:last_valid_index]
# END cut away invalid part
line_str = line_str.rstrip()
cur_count, max_count = None, None
match = self.re_op_relative.match(line_str)
if match is None:
match = self.re_op_absolute.match(line_str)
if not match:
self.line_dropped(line_str)
self.other_lines.append(line_str)
return
# END could not get match
op_code = 0
_remote, op_name, _percent, cur_count, max_count, message = match.groups()
# get operation id
if op_name == "Counting objects":
op_code |= self.COUNTING
elif op_name == "Compressing objects":
op_code |= self.COMPRESSING
elif op_name == "Writing objects":
op_code |= self.WRITING
elif op_name == "Receiving objects":
op_code |= self.RECEIVING
elif op_name == "Resolving deltas":
op_code |= self.RESOLVING
elif op_name == "Finding sources":
op_code |= self.FINDING_SOURCES
elif op_name == "Checking out files":
op_code |= self.CHECKING_OUT
else:
# Note: On windows it can happen that partial lines are sent
# Hence we get something like "CompreReceiving objects", which is
# a blend of "Compressing objects" and "Receiving objects".
# This can't really be prevented, so we drop the line verbosely
# to make sure we get informed in case the process spits out new
# commands at some point.
self.line_dropped(line_str)
# Note: Don't add this line to the other lines, as we have to silently
# drop it
return None
# END handle op code
# figure out stage
if op_code not in self._seen_ops:
self._seen_ops.append(op_code)
op_code |= self.BEGIN
# END begin opcode
if message is None:
message = ""
# END message handling
message = message.strip()
if message.endswith(self.DONE_TOKEN):
op_code |= self.END
message = message[: -len(self.DONE_TOKEN)]
# END end message handling
message = message.strip(self.TOKEN_SEPARATOR)
self.update(
op_code,
cur_count and float(cur_count),
max_count and float(max_count),
message,
)
def new_message_handler(self) -> Callable[[str], None]:
"""
:return:
a progress handler suitable for handle_process_output(), passing lines on to this Progress
handler in a suitable format"""
def handler(line: AnyStr) -> None:
return self._parse_progress_line(line.rstrip())
# end
return handler
def line_dropped(self, line: str) -> None:
"""Called whenever a line could not be understood and was therefore dropped."""
pass
def update(
self,
op_code: int,
cur_count: Union[str, float],
max_count: Union[str, float, None] = None,
message: str = "",
) -> None:
"""Called whenever the progress changes
:param op_code:
Integer allowing to be compared against Operation IDs and stage IDs.
Stage IDs are BEGIN and END. BEGIN will only be set once for each Operation
ID as well as END. It may be that BEGIN and END are set at once in case only
one progress message was emitted due to the speed of the operation.
Between BEGIN and END, none of these flags will be set
Operation IDs are all held within the OP_MASK. Only one Operation ID will
be active per call.
:param cur_count: Current absolute count of items
:param max_count:
The maximum count of items we expect. It may be None in case there is
no maximum number of items or if it is (yet) unknown.
:param message:
In case of the 'WRITING' operation, it contains the amount of bytes
transferred. It may possibly be used for other purposes as well.
You may read the contents of the current line in self._cur_line"""
pass
class CallableRemoteProgress(RemoteProgress):
"""An implementation forwarding updates to any callable"""
__slots__ = "_callable"
def __init__(self, fn: Callable) -> None:
self._callable = fn
super(CallableRemoteProgress, self).__init__()
def update(self, *args: Any, **kwargs: Any) -> None:
self._callable(*args, **kwargs)
class Actor(object):
"""Actors hold information about a person acting on the repository. They
can be committers and authors or anything with a name and an email as
mentioned in the git log entries."""
# PRECOMPILED REGEX
name_only_regex = re.compile(r"<(.*)>")
name_email_regex = re.compile(r"(.*) <(.*?)>")
# ENVIRONMENT VARIABLES
# read when creating new commits
env_author_name = "GIT_AUTHOR_NAME"
env_author_email = "GIT_AUTHOR_EMAIL"
env_committer_name = "GIT_COMMITTER_NAME"
env_committer_email = "GIT_COMMITTER_EMAIL"
# CONFIGURATION KEYS
conf_name = "name"
conf_email = "email"
__slots__ = ("name", "email")
def __init__(self, name: Optional[str], email: Optional[str]) -> None:
self.name = name
self.email = email
def __eq__(self, other: Any) -> bool:
return self.name == other.name and self.email == other.email
def __ne__(self, other: Any) -> bool:
return not (self == other)
def __hash__(self) -> int:
return hash((self.name, self.email))
def __str__(self) -> str:
return self.name if self.name else ""
def __repr__(self) -> str:
return '<git.Actor "%s <%s>">' % (self.name, self.email)
@classmethod
def _from_string(cls, string: str) -> "Actor":
"""Create an Actor from a string.
:param string: is the string, which is expected to be in regular git format
John Doe <jdoe@example.com>
:return: Actor"""
m = cls.name_email_regex.search(string)
if m:
name, email = m.groups()
return Actor(name, email)
else:
m = cls.name_only_regex.search(string)
if m:
return Actor(m.group(1), None)
# assume best and use the whole string as name
return Actor(string, None)
# END special case name
# END handle name/email matching
@classmethod
def _main_actor(
cls,
env_name: str,
env_email: str,
config_reader: Union[None, "GitConfigParser", "SectionConstraint"] = None,
) -> "Actor":
actor = Actor("", "")
user_id = None # We use this to avoid multiple calls to getpass.getuser()
def default_email() -> str:
nonlocal user_id
if not user_id:
user_id = get_user_id()
return user_id
def default_name() -> str:
return default_email().split("@")[0]
for attr, evar, cvar, default in (
("name", env_name, cls.conf_name, default_name),
("email", env_email, cls.conf_email, default_email),
):
try:
val = os.environ[evar]
setattr(actor, attr, val)
except KeyError:
if config_reader is not None:
try:
val = config_reader.get("user", cvar)
except Exception:
val = default()
setattr(actor, attr, val)
# END config-reader handling
if not getattr(actor, attr):
setattr(actor, attr, default())
# END handle name
# END for each item to retrieve
return actor
@classmethod
def committer(cls, config_reader: Union[None, "GitConfigParser", "SectionConstraint"] = None) -> "Actor":
"""
:return: Actor instance corresponding to the configured committer. It behaves
similar to the git implementation, such that the environment will override
configuration values of config_reader. If no value is set at all, it will be
generated
:param config_reader: ConfigReader to use to retrieve the values from in case
they are not set in the environment"""
return cls._main_actor(cls.env_committer_name, cls.env_committer_email, config_reader)
@classmethod
def author(cls, config_reader: Union[None, "GitConfigParser", "SectionConstraint"] = None) -> "Actor":
"""Same as committer(), but defines the main author. It may be specified in the environment,
but defaults to the committer"""
return cls._main_actor(cls.env_author_name, cls.env_author_email, config_reader)
class Stats(object):
"""
Represents stat information as presented by git at the end of a merge. It is
created from the output of a diff operation.
``Example``::
c = Commit( sha1 )
s = c.stats
s.total # full-stat-dict
s.files # dict( filepath : stat-dict )
``stat-dict``
A dictionary with the following keys and values::
deletions = number of deleted lines as int
insertions = number of inserted lines as int
lines = total number of lines changed as int, or deletions + insertions
``full-stat-dict``
In addition to the items in the stat-dict, it features additional information::
files = number of changed files as int"""
__slots__ = ("total", "files")
def __init__(self, total: Total_TD, files: Dict[PathLike, Files_TD]):
self.total = total
self.files = files
@classmethod
def _list_from_string(cls, repo: "Repo", text: str) -> "Stats":
"""Create a Stat object from output retrieved by git-diff.
:return: git.Stat"""
hsh: HSH_TD = {
"total": {"insertions": 0, "deletions": 0, "lines": 0, "files": 0},
"files": {},
}
for line in text.splitlines():
(raw_insertions, raw_deletions, filename) = line.split("\t")
insertions = raw_insertions != "-" and int(raw_insertions) or 0
deletions = raw_deletions != "-" and int(raw_deletions) or 0
hsh["total"]["insertions"] += insertions
hsh["total"]["deletions"] += deletions
hsh["total"]["lines"] += insertions + deletions
hsh["total"]["files"] += 1
files_dict: Files_TD = {
"insertions": insertions,
"deletions": deletions,
"lines": insertions + deletions,
}
hsh["files"][filename.strip()] = files_dict
return Stats(hsh["total"], hsh["files"])
class IndexFileSHA1Writer(object):
"""Wrapper around a file-like object that remembers the SHA1 of
the data written to it. It will write a sha when the stream is closed
or if the asked for explicitly using write_sha.
Only useful to the indexfile
:note: Based on the dulwich project"""
__slots__ = ("f", "sha1")
def __init__(self, f: IO) -> None:
self.f = f
self.sha1 = make_sha(b"")
def write(self, data: AnyStr) -> int:
self.sha1.update(data)
return self.f.write(data)
def write_sha(self) -> bytes:
sha = self.sha1.digest()
self.f.write(sha)
return sha
def close(self) -> bytes:
sha = self.write_sha()
self.f.close()
return sha
def tell(self) -> int:
return self.f.tell()
class LockFile(object):
"""Provides methods to obtain, check for, and release a file based lock which
should be used to handle concurrent access to the same file.
As we are a utility class to be derived from, we only use protected methods.
Locks will automatically be released on destruction"""
__slots__ = ("_file_path", "_owns_lock")
def __init__(self, file_path: PathLike) -> None:
self._file_path = file_path
self._owns_lock = False
def __del__(self) -> None:
self._release_lock()
def _lock_file_path(self) -> str:
""":return: Path to lockfile"""
return "%s.lock" % (self._file_path)
def _has_lock(self) -> bool:
""":return: True if we have a lock and if the lockfile still exists
:raise AssertionError: if our lock-file does not exist"""
return self._owns_lock
def _obtain_lock_or_raise(self) -> None:
"""Create a lock file as flag for other instances, mark our instance as lock-holder
:raise IOError: if a lock was already present or a lock file could not be written"""
if self._has_lock():
return
lock_file = self._lock_file_path()
if osp.isfile(lock_file):
raise IOError(
"Lock for file %r did already exist, delete %r in case the lock is illegal"
% (self._file_path, lock_file)
)
try:
flags = os.O_WRONLY | os.O_CREAT | os.O_EXCL
if is_win:
flags |= os.O_SHORT_LIVED
fd = os.open(lock_file, flags, 0)
os.close(fd)
except OSError as e:
raise IOError(str(e)) from e
self._owns_lock = True
def _obtain_lock(self) -> None:
"""The default implementation will raise if a lock cannot be obtained.
Subclasses may override this method to provide a different implementation"""
return self._obtain_lock_or_raise()
def _release_lock(self) -> None:
"""Release our lock if we have one"""
if not self._has_lock():
return
# if someone removed our file beforhand, lets just flag this issue
# instead of failing, to make it more usable.
lfp = self._lock_file_path()
try:
rmfile(lfp)
except OSError:
pass
self._owns_lock = False
class BlockingLockFile(LockFile):
"""The lock file will block until a lock could be obtained, or fail after
a specified timeout.
:note: If the directory containing the lock was removed, an exception will
be raised during the blocking period, preventing hangs as the lock
can never be obtained."""
__slots__ = ("_check_interval", "_max_block_time")
def __init__(
self,
file_path: PathLike,
check_interval_s: float = 0.3,
max_block_time_s: int = maxsize,
) -> None:
"""Configure the instance
:param check_interval_s:
Period of time to sleep until the lock is checked the next time.
By default, it waits a nearly unlimited time
:param max_block_time_s: Maximum amount of seconds we may lock"""
super(BlockingLockFile, self).__init__(file_path)
self._check_interval = check_interval_s
self._max_block_time = max_block_time_s
def _obtain_lock(self) -> None:
"""This method blocks until it obtained the lock, or raises IOError if
it ran out of time or if the parent directory was not available anymore.
If this method returns, you are guaranteed to own the lock"""
starttime = time.time()