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# Copyright (c) Facebook, Inc. and its affiliates.
# All rights reserved.
#
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.
import os
import signal
import subprocess
from contextlib import contextmanager
@contextmanager
def magic_trace(output="trace.fxt", magic_trace_cache="/tmp/magic-trace"):
pid = os.getpid()
if not os.path.exists(magic_trace_cache):
print(f"Downloading magic_trace to: {magic_trace_cache}")
subprocess.run(
[
"wget",
"-O",
magic_trace_cache,
"-q",
"https://github.com/janestreet/magic-trace/releases/download/v1.0.2/magic-trace",
]
)
subprocess.run(["chmod", "+x", magic_trace_cache])
args = [magic_trace_cache, "attach", "-pid", str(pid), "-o", output]
p = subprocess.Popen(args, stderr=subprocess.PIPE, encoding="utf-8")
while True:
x = p.stderr.readline()
print(x)
if "Attached" in x:
break
try:
yield
finally:
p.send_signal(signal.SIGINT)
r = p.wait()
print(p.stderr.read())
p.stderr.close()
if r != 0:
raise ValueError(f"magic_trace exited abnormally: {r}")
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