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5bd8e2363a
This will help to keep us from using deprecated Python features going forward. Signed-off-by: Tristan Partin <tristan@neon.tech>
55 lines
1.7 KiB
Python
55 lines
1.7 KiB
Python
from __future__ import annotations
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import os.path
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import shutil
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import subprocess
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import threading
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import time
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from contextlib import closing
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from fixtures.log_helper import log
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from fixtures.neon_fixtures import NeonEnv
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def lsof_path() -> str:
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path_output = shutil.which("lsof")
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if path_output is None:
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raise RuntimeError("lsof not found in PATH")
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else:
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return path_output
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# Makes sure that `pageserver.pid` is only held by `pageserve` command, not other commands.
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# This is to test the changes in https://github.com/neondatabase/neon/pull/1834.
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def test_lsof_pageserver_pid(neon_simple_env: NeonEnv):
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env = neon_simple_env
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def start_workload():
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env.create_branch("test_lsof_pageserver_pid")
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endpoint = env.endpoints.create_start("test_lsof_pageserver_pid")
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with closing(endpoint.connect()) as conn:
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with conn.cursor() as cur:
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cur.execute("CREATE TABLE foo as SELECT x FROM generate_series(1,100000) x")
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cur.execute("update foo set x=x+1")
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workload_thread = threading.Thread(target=start_workload, args=(), daemon=True)
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workload_thread.start()
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path = os.path.join(env.pageserver.workdir, "pageserver.pid")
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lsof = lsof_path()
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while workload_thread.is_alive():
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res = subprocess.run(
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[lsof, path],
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check=False,
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text=True,
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capture_output=True,
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)
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# parse the `lsof` command's output to get only the list of commands
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commands = [line.split(" ")[0] for line in res.stdout.strip().split("\n")[1:]]
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if len(commands) > 0:
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log.info(f"lsof commands: {commands}")
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assert commands == ["pageserve"]
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time.sleep(1.0)
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