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import unittest
import os
import textwrap
import importlib
import sys
from test.support import os_helper, SHORT_TIMEOUT
from test.support.script_helper import make_script
import subprocess
PROCESS_VM_READV_SUPPORTED = False
try:
from _testexternalinspection import PROCESS_VM_READV_SUPPORTED
from _testexternalinspection import get_stack_trace
except ImportError:
raise unittest.SkipTest("Test only runs when _testexternalinspection is available")
def _make_test_script(script_dir, script_basename, source):
to_return = make_script(script_dir, script_basename, source)
importlib.invalidate_caches()
return to_return
class TestGetStackTrace(unittest.TestCase):
@unittest.skipIf(sys.platform != "darwin" and sys.platform != "linux", "Test only runs on Linux and MacOS")
@unittest.skipIf(sys.platform == "linux" and not PROCESS_VM_READV_SUPPORTED, "Test only runs on Linux with process_vm_readv support")
def test_remote_stack_trace(self):
# Spawn a process with some realistic Python code
script = textwrap.dedent("""\
import time, sys, os
def bar():
for x in range(100):
if x == 50:
baz()
def baz():
foo()
def foo():
fifo = sys.argv[1]
with open(sys.argv[1], "w") as fifo:
fifo.write("ready")
time.sleep(1000)
bar()
""")
stack_trace = None
with os_helper.temp_dir() as work_dir:
script_dir = os.path.join(work_dir, "script_pkg")
os.mkdir(script_dir)
fifo = f"{work_dir}/the_fifo"
os.mkfifo(fifo)
script_name = _make_test_script(script_dir, 'script', script)
try:
p = subprocess.Popen([sys.executable, script_name, str(fifo)])
with open(fifo, "r") as fifo_file:
response = fifo_file.read()
self.assertEqual(response, "ready")
stack_trace = get_stack_trace(p.pid)
except PermissionError:
self.skipTest("Insufficient permissions to read the stack trace")
finally:
os.remove(fifo)
p.kill()
p.terminate()
p.wait(timeout=SHORT_TIMEOUT)
expected_stack_trace = [
'foo',
'baz',
'bar',
'<module>'
]
self.assertEqual(stack_trace, expected_stack_trace)
@unittest.skipIf(sys.platform != "darwin" and sys.platform != "linux", "Test only runs on Linux and MacOS")
@unittest.skipIf(sys.platform == "linux" and not PROCESS_VM_READV_SUPPORTED, "Test only runs on Linux with process_vm_readv support")
def test_self_trace(self):
stack_trace = get_stack_trace(os.getpid())
self.assertEqual(stack_trace[0], "test_self_trace")
if __name__ == "__main__":
unittest.main()
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