ED/EDMarketConnector
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Implement msvcrt.locking() under win32

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NB: The locked file *must* be opened at top level in order for the file
handle to not get cleaned up, which also removes the locks.
This commit is contained in:
Athanasius 2021-01-18 16:30:09 +00:00
parent 937a38f0b5
commit ab281bca5a
1 changed files with 27 additions and 5 deletions
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32
EDMarketConnector.py
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@ -9,7 +9,7 @@ import re
import sys
import webbrowser
from builtins import object, str
from os import chdir, environ
from os import chdir, environ, getpid as os_getpid
from os.path import dirname, isdir, join
from sys import platform
from time import localtime, strftime, time
@ -42,7 +42,8 @@ if __name__ == '__main__':
args = parser.parse_args()
if __name__ == "__main__":
journal_dir_lockfile = None
journal_dir = config.get('journaldir') or config.default_journal_dir
journal_dir_lockfile = open(join(journal_dir, 'edmc-journal-lock.txt'), mode='w+', encoding='utf-8')
def no_other_instance_running() -> bool: # noqa: CCR001
"""
@ -50,11 +51,32 @@ if __name__ == "__main__":
:returns: True if we are the single instance, else False.
"""
journal_dir = config.get('journaldir') or config.default_journal_dir
print('no_other_instance_running(): Begin...')
if sys.platform == 'win32':
journal_dir_lockfile = open(join(journal_dir, 'edmc-journal-lock.txt'), mode='a+', encoding='utf-8')
if platform == 'win32':
print('no_other_instance_running(): win32')
import msvcrt
print(f'no_other_instance_running(): journal_dir_lockfile = {journal_dir_lockfile!r}')
try:
msvcrt.locking(journal_dir_lockfile.fileno(), msvcrt.LK_NBLCK, 4096)
except PermissionError as e:
print(f"PermissionError: Couldn't lock journal directory \"{journal_dir}\", assuming another process running\n{e}")
return False
except OSError as e:
print(f"OSError: Couldn't lock journal directory \"{journal_dir}\", assuming another process running\n{e}")
return False
except Exception as e:
print(f"other Exception: Couldn't lock journal directory \"{journal_dir}\", assuming another process running\n{e}")
return False
journal_dir_lockfile.write(f"Path: {journal_dir}\nPID: {os_getpid()}\n")
print('no_other_instance_running(): Done')
return True
def already_running_popup():