mirror of https://github.com/m-labs/artiq.git
54 lines
1.4 KiB
Python
54 lines
1.4 KiB
Python
"""
|
|
Caches source files on import so that inspect.getsource returns the source code that
|
|
was imported (or at least with a small race window), not what is currently on the
|
|
filesystem at the time inspect.getsource is called.
|
|
This is a hack and it still has races, and it would be better if Python supported
|
|
this correctly, but it does not.
|
|
"""
|
|
|
|
import linecache
|
|
import tokenize
|
|
import logging
|
|
|
|
|
|
__all__ = ["install_hook", "add_module_to_cache"]
|
|
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
cache = dict()
|
|
linecache_getlines = None
|
|
|
|
|
|
def add_module_to_cache(module):
|
|
if hasattr(module, "__file__"):
|
|
fn = module.__file__
|
|
if fn not in cache:
|
|
try:
|
|
with tokenize.open(fn) as fp:
|
|
lines = fp.readlines()
|
|
if lines and not lines[-1].endswith("\n"):
|
|
lines[-1] += "\n"
|
|
cache[fn] = lines
|
|
except:
|
|
logger.warning("failed to add '%s' to cache", fn, exc_info=True)
|
|
else:
|
|
logger.debug("added '%s' to cache", fn)
|
|
|
|
|
|
def hook_getlines(filename, module_globals=None):
|
|
if filename in cache:
|
|
return cache[filename]
|
|
else:
|
|
return linecache_getlines(filename, module_globals)
|
|
|
|
|
|
def install_hook():
|
|
global linecache_getlines
|
|
|
|
linecache_getlines = linecache.getlines
|
|
linecache.getlines = hook_getlines
|
|
|
|
logger.debug("hook installed")
|