ClickHouse/tests/queries/0_stateless/00962_live_view_periodic_refresh.py

#!/usr/bin/env python3
# Tags: no-replicated-database, no-parallel, no-fasttest

import os
import sys
import signal

CURDIR = os.path.dirname(os.path.realpath(__file__))
sys.path.insert(0, os.path.join(CURDIR, "helpers"))

from client import client, prompt, end_of_block

log = None
# uncomment the line below for debugging
# log=sys.stdout

with client(name="client1>", log=log) as client1, client(
    name="client2>", log=log
) as client2:
    client1.expect(prompt)
    client2.expect(prompt)

    client1.send("SET allow_experimental_live_view = 1")
    client1.expect(prompt)
    client2.send("SET allow_experimental_live_view = 1")
    client2.expect(prompt)

    client1.send("DROP TABLE IF EXISTS test.lv")
    client1.expect(prompt)
    client1.send(
        "CREATE LIVE VIEW test.lv WITH REFRESH 1"
        " AS SELECT value FROM system.events WHERE event = 'OSCPUVirtualTimeMicroseconds'"
    )
    client1.expect(prompt)
    client1.send("WATCH test.lv FORMAT JSONEachRow")
    client1.expect(r'"_version":' + end_of_block)
    client1.expect(r'"_version":' + end_of_block)
    client1.expect(r'"_version":' + end_of_block)
    # send Ctrl-C
    client1.send("\x03", eol="")
    match = client1.expect("(%s)|([#\$] )" % prompt)
    if match.groups()[1]:
        client1.send(client1.command)
        client1.expect(prompt)
    client1.send("DROP TABLE test.lv")
    client1.expect(prompt)