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#!/usr/bin/python
# test of simplest device
from epics import PV, get_pv, caget, camonitor, camonitor_clear
import os
import psutil
import time
import pvnames
mypv = pvnames.updating_pv1
def test_connect_disconnect():
pv = PV(mypv, auto_monitor=True, callback=lambda **args: ...)
pv.wait_for_connection()
# check that PV is connected
assert pv.connected is True
# check that data is received
value = pv.get()
assert value is not None
pv.disconnect()
# check that PV is disconnected
assert pv.connected is False
# check that no data is received after disconnect
value = pv.get()
assert value is None
def test_reconnect():
# connect and disconnect
pv = PV(mypv, auto_monitor=True, callback=lambda **args: ...)
pv.wait_for_connection()
pv.disconnect()
# try to reconnect to the same PV
connected = pv.reconnect()
# check that PV is connected
assert connected is True
# check that data is received
value = pv.get()
assert value is not None
def test_with_two_PVs():
# create 2 PV objects connecting to the same PV signal
pv1 = PV(mypv, auto_monitor=True, callback=lambda **args: ...)
pv2 = PV(mypv, auto_monitor=True, callback=lambda **args: ...)
pv1.wait_for_connection()
pv2.wait_for_connection()
# check that both PVs are connected
assert pv1.connected is True
assert pv2.connected is True
# check that data is received
assert pv1.get() is not None
assert pv2.get() is not None
# disconnect 1 PV
pv1.disconnect()
# check that the first PV is disconnected and doesn't receive data
assert pv1.connected is False
assert pv1.get() is None
# check that the other PV is connected and still receives data
assert pv2.connected is True
assert pv2.get() is not None
def test_with_PV_and_getPV():
# create 2 PV objects connecting to the same PV signal, one using PV class and the other one using get_pv()
pv1 = PV(mypv, auto_monitor=True, callback=lambda **args: ...)
pv2 = get_pv(mypv)
pv1.wait_for_connection()
pv2.wait_for_connection()
# check that both PVs are connected
assert pv1.connected is True
assert pv2.connected is True
# check that data is received
assert pv1.get() is not None
assert pv2.get() is not None
# disconnect 1 PV
pv1.disconnect()
time.sleep(1)
# check that the first PV is disconnected and doesn't receive data
assert pv1.connected is False
assert pv1.get() is None
# check that the other PV is connected and still receives data
assert pv2.connected is True
assert pv2.get() is not None
def test_with_getPV():
# create 2 PV objects connecting to the same PV signal using get_pv()
pv1 = get_pv(mypv)
pv2 = get_pv(mypv)
pv1.wait_for_connection()
pv2.wait_for_connection()
# check that both PVs are connected
assert pv1.connected is True
assert pv2.connected is True
# check that data is received
assert pv1.get() is not None
assert pv2.get() is not None
# disconnect 1 PV
pv1.disconnect()
time.sleep(1)
# check that the first PV is disconnected and doesn't receive data
assert pv1.connected is False
assert pv1.get() is None
# check that the other PV is also disconnected and doesn't receive data either
assert pv2.connected is False
assert pv2.get() is None
def test_with_caget():
pv = PV(mypv, auto_monitor=True, callback=lambda **args: ...)
pv.wait_for_connection()
# check that the PV is connected and data is received
assert pv.connected is True
assert pv.get() is not None
# use caget to get data from the same PV
assert caget(mypv) is not None
# disconnect PV object
pv.disconnect()
# check that the PV is disconnected and doesn't receive data
assert pv.connected is False
assert pv.get() is None
# check that you can still use caget to get data from the same PV
assert caget(mypv) is not None
def test_with_caget_nomonitor():
pv = PV(mypv, auto_monitor=True, callback=lambda **args: ...)
pv.wait_for_connection()
# check that the PV is connected and data is received
assert pv.connected is True
assert pv.get() is not None
# use caget to get data from the same PV
assert caget(mypv, use_monitor=False) is not None
# disconnect PV object
pv.disconnect()
# check that the PV is disconnected and doesn't receive data
assert pv.connected is False
assert pv.get() is None
# check that you can still use caget to get data from the same PV
assert caget(mypv, use_monitor=False) is not None
def test_with_camonitor():
pv = PV(mypv, auto_monitor=True, callback=lambda **args: ...)
pv.wait_for_connection()
# check that the PV is connected and data is received
assert pv.connected is True
assert pv.get() is not None
# use camonitor
received = {'flag': False}
def callback(**args):
received['flag'] = True
camonitor(mypv, callback=callback)
time.sleep(1)
# check that the monitor receives data
assert received['flag'] is True
# disconnect PV object
pv.disconnect()
time.sleep(1)
# check that the PV is disconnected and doesn't receive data
assert pv.connected is False
assert pv.get() is None
# reset the flag to check that new data is received by camonitor
received['flag'] = False
time.sleep(1)
assert received['flag'] is True
# clear the monitor
camonitor_clear(mypv)
time.sleep(1)
# reset the flag to check that no new data is received by camonitor
received['flag'] = False
time.sleep(1)
assert received['flag'] is False
def test_memleak_disconnect():
# try to connect multiple times to the same PV
mem = []
for i in range(int(2)):
for j in range(int(1000)):
pv = PV(mypv, auto_monitor=True, callback=lambda **args: ...)
pv.disconnect()
process = psutil.Process(os.getpid())
mem.append(process.memory_info().rss)
# check used memory by the process didn't increase by more than 1%
assert mem[1]/mem[0] < 1.01
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