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import sys
import inspect
import textwrap
import types
import uuid
from contextlib import contextmanager
@contextmanager
def temp_module(code):
"""Mutually recursive struct types defined inside functions don't work (and
probably never will). To avoid populating a bunch of test structs in the
top level of this module, we instead create a temporary module per test to
exec whatever is needed for that test"""
code = textwrap.dedent(code)
name = f"temp_{uuid.uuid4().hex}"
mod = types.ModuleType(name)
sys.modules[name] = mod
try:
exec(code, mod.__dict__)
yield mod
finally:
sys.modules.pop(name, None)
@contextmanager
def max_call_depth(n):
cur_depth = len(inspect.stack(0))
orig = sys.getrecursionlimit()
try:
# Our measure of the current stack depth can be off by a bit. Trying to
# set a recursionlimit < the current depth will raise a RecursionError.
# We just try again with a slightly higher limit, bailing after an
# unreasonable amount of adjustments.
for i in range(64):
try:
sys.setrecursionlimit(cur_depth + i + n)
break
except RecursionError:
pass
else:
raise ValueError(
"Failed to set low recursion limit, something is wrong here"
)
yield
finally:
sys.setrecursionlimit(orig)
@contextmanager
def package_not_installed(name):
try:
orig = sys.modules.get(name)
sys.modules[name] = None
yield
finally:
if orig is not None:
sys.modules[name] = orig
else:
del sys.modules[name]
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