def check_telnet_hooks(scpi_obj):
_print_header("Telnet hooks")
try:
ipv4 = Telnet("127.0.0.1", 5025)
ipv6 = Telnet("::1", 5025)
cmd = "*IDN?"
def hook(who, what):
_print_info("\t\thook call, received: ({0!r}, {1!r})"
"".format(who, what))
scpi_obj.addConnectionHook(hook)
_print_info("\tipv4 send {0}".format(cmd))
ipv4.write(cmd)
_print_info("\tipv4 answer {0!r}".format(ipv4.read_until('\n')))
_print_info("\tipv6 send {0}".format(cmd))
ipv6.write(cmd)
_print_info("\tipv6 answer {0!r}".format(ipv6.read_until('\n')))
scpi_obj.removeConnectionHook(hook)
ipv4.close()
ipv6.close()
result = True, "Telnet hooks test PASSED"
except Exception as exc:
print("\tUnexpected kind of exception! {0}".format(exc))
print_exc()
result = False, "Telnet hooks test FAILED"
_print_footer(result[1])
return result
def check_write_without_params(scpi_obj):
_print_header("Attribute write without parameters")
try:
cmd = 'writter:without:parameters'
switch = WattrTest()
scpi_obj.add_command(cmd, read_cb=switch.switchTest)
correct, failed = 0, 0
for i in range(3):
cmd = "{0}{1}".format(cmd, " "*i)
try:
answer = _send2input(scpi_obj, cmd, expected_answer='ACK\r\n')
except ValueError as exc:
msg = "Error: {0}".format(exc)
failed += 1
else:
msg = "Answer: {0!r} (len ({1:d})" \
"".format(answer, len(answer))
correct += 1
print("\tRequest {0!r}\n\t{1}\n".format(cmd, msg))
if failed == 0:
result = True, "Write without parameters test PASSED"
else:
print("Failed {0}/{1}".format(failed, correct+failed))
result = False, "Write without parameters test FAILED"
except Exception as exc:
print("\tUnexpected kind of exception! {0}".format(exc))
print_exc()
result = False, "Write without parameters test FAILED"
_print_footer(result[1])
return result
def add_invalid_cmds(scpi_obj):
_print_header("Testing to build invalid commands")
try:
scpi_obj.add_command(":startswithcolon", read_cb=None)
except NameError as exc:
print("\tNull name test PASSED")
except Exception as exc:
print("\tUnexpected kind of exception! {0}".format(exc))
print_exc()
return False, "Invalid commands test FAILED"
try:
scpi_obj.add_command("double::colons", read_cb=None)
except NameError:
print("\tDouble colon name test PASSED")
except Exception as exc:
print("\tUnexpected kind of exception! {0}".format(exc))
print_exc()
return False, "Invalid commands test FAILED"
try:
scpi_obj.add_command("nestedSpecial:*special", read_cb=None)
except NameError:
scpi_obj.command_tree.pop('nestedSpecial')
print("\tNested special command test PASSED")
except Exception as exp:
print("\tUnexpected kind of exception! {0}".format(exc))
print_exc()
return False, "Invalid commands test FAILED"
result = True, "Invalid commands test PASSED"
_print_footer(result[1])
return result
def check_wo_special_cmds(scpi_obj):
_print_header("Test Write Only special commands")
wilco = "wilco\r\n"
commands = [['SHT', sht, wilco],
['RST', rst, wilco],
['RAP', rap, wilco]]
correct, failed = 0, 0
for cmd_name, write_cb, expected_answer in commands:
try:
scpi_obj.add_special_command(cmd_name, read_cb=None,
write_cb=write_cb)
answer = ''
start_t = _time()
answer = _send2input(
scpi_obj, "*{0}".format(cmd_name),
expected_answer=expected_answer)
correct += 1
except ValueError as exc:
print("\tSpecial command {0} answer failed: {0}"
"".format(cmd_name, exc))
failed += 1
except Exception as exc:
print("\tUnexpected kind of exception! {0}".format(exc))
print_exc()
failed += 1
print("\tWrite Only special command *{0}\n"
"\tAnswer: {1!r} ({2:g} ms)"
"".format(cmd_name, answer, (_time()-start_t)*1000))
if failed == 0:
result = True, "Write Only special commands test PASSED"
else:
print("Failed {0}/{1}".format(failed, correct+failed))
result = False, "Write Only special commands test FAILED"
_print_footer(result[1])
return result
def check_locks(scpi_obj):
_print_header("system [write]lock")
try:
LockThreadedTest(scpi_obj).launch_test()
result = True, "system [write]lock test PASSED"
except Exception as exc:
print("\tUnexpected kind of exception! {0}".format(exc))
print_exc()
result = False, "system [write]lock test FAILED"
_print_footer(result[1])
return result
def check_nonexisting_commands(scpi_obj):
_print_header("Testing to query commands that doesn't exist")
base_cmd = _random_choice(['SOURce', 'BASIcloop', 'ITERative'])
sub_cmd = _random_choice(['CURRent', 'VOLTage'])
attr = _random_choice(['UPPEr', 'LOWEr', 'VALUe'])
fake = "FAKE"
ack = 'ACK\r\n'
nok = 'NOK\r\n'
start_t = _time()
pairs = [
# * first level doesn't exist
["{0}:{1}:{2}?".format(fake, sub_cmd, attr), nok],
# * intermediate level doesn't exist
["{0}:{1}:{2}?".format(base_cmd, fake, attr), nok],
# * Attribute level doesn't exist
["{0}:{1}:{2}?".format(base_cmd, sub_cmd, fake), nok],
# * Attribute that doesn't respond
['source:voltage:exception?', nok],
# * Unexisting Channel
["CHANnel{0}".format(str(n_channels+3).zfill(2)), nok],
# * Channel below the minimum reference
["CHANnel00:VOLTage:UPPEr?", nok],
# * Channel above the maximum reference
["CHANnel99:VOLTage:UPPEr?", nok],
]
correct, failed = 0, 0
for cmd, expected_answer in pairs:
answer = ''
try:
start_t = _time()
answer = _send2input(
scpi_obj, cmd, expected_answer=expected_answer)
correct += 1
except ValueError as exc:
print("\tFake command answer failed: {0}".format(exc))
failed += 1
except Exception as exc:
print("\tUnexpected kind of exception! {0}".format(exc))
print_exc()
failed += 1
print("\tRequest non-existing command {0}\n"
"\tAnswer: {1!r} ({2:g} ms)"
"".format(cmd, answer, (_time()-start_t)*1000))
if failed == 0:
result = True, "Non-existing commands test PASSED"
else:
print("Failed {0}/{1}".format(failed, correct+failed))
result = False, "Non-existing commands test FAILED"
_print_footer(result[1])
return result
def check_array_answers(scpi_obj):
_print_header("Requesting an attribute the answer of which is an array")
try:
base_cmd = 'source'
attr_cmd = 'buffer'
long_test = ArrayTest(100)
scpi_obj.add_command(attr_cmd, read_cb=long_test.readTest)
# current
current_obj = ArrayTest(5)
current_cmd = "{0}:current:{1}".format(base_cmd, attr_cmd)
scpi_obj.add_command(current_cmd, read_cb=current_obj.readTest)
# voltage
voltage_obj = ArrayTest(5)
voltage_cmd = "{0}:voltage:{1}".format(base_cmd, attr_cmd)
scpi_obj.add_command(voltage_cmd, read_cb=voltage_obj.readTest)
# queries
answers_lengths = {}
correct, failed = 0, 0
for cmd in [attr_cmd, current_cmd, voltage_cmd]:
for format in ['ASCII', 'QUADRUPLE', 'DOUBLE', 'SINGLE', 'HALF']:
_send2input(scpi_obj, "DataFormat {0}".format(format),
check_answer=False)
answer = None
try:
answer = _send2input(
scpi_obj, cmd + '?', bad_answer='NOK\r\n')
except ValueError as exc:
msg = "Error: {0}".format(exc)
failed += 1
else:
msg = "Answer: {0!r} (len ({1:d})" \
"".format(answer, len(answer))
correct += 1
print("\tRequest {0!r}\n\t{1}\n".format(cmd, msg))
if format not in answers_lengths:
answers_lengths[format] = []
answers_lengths[format].append(
len(answer) if answer is not None else 0)
print("\tanswer lengths summary: {0}".format(
"".join('\n\t\t{0}:{1}'.format(k, v)
for k, v in answers_lengths.iteritems())))
if failed == 0:
result = True, "Array answers test PASSED"
else:
print("Failed {0}/{1}".format(failed, correct+failed))
result = False, "Array answers test FAILED"
except Exception as e:
print("\tUnexpected kind of exception! {0}".format(e))
print_exc()
result = False, "Array answers test FAILED"
_print_footer(result[1])
return result
def check_command_queries(scpi_obj):
_print_header("Testing to command queries")
try:
print("Launch tests:")
cmd = "*IDN?"
answer = _send2input(scpi_obj, cmd)
print("\tInstrument identification ({0})\n\tAnswer: {1}"
"".format(cmd, answer))
for base_cmd in ['SOURce', 'BASIcloop', 'ITERative']:
_print_header("Check {0} part of the tree".format(base_cmd))
_do_check_commands(scpi_obj, base_cmd)
for ch in range(1, n_channels+1):
base_cmd = "CHANnel{0}".format(str(ch).zfill(2))
_print_header("Check {0} part of the tree".format(base_cmd))
_do_check_commands(scpi_obj, base_cmd)
fn = _random_choice(range(1, n_subchannels+1))
inner_cmd = "FUNCtion{0}".format(str(fn).zfill(2))
_print_header("Check {0} + MEAS:{1} part of the tree"
"".format(base_cmd, inner_cmd))
_do_check_commands(scpi_obj, base_cmd, inner_cmd)
result = True, "Command queries test PASSED"
except Exception as exc:
print("\tUnexpected kind of exception! {0}".format(e))
print_exc()
result = False, "Command queries test FAILED"
_print_footer(result[1])
return result
def check_multiple_commands(scpi_obj):
_print_header("Requesting more than one attribute per query")
try:
log = {}
correct, failed = 0, 0
for i in range(2, concatenated_cmds+1):
lst = []
for j in range(i):
bar = _build_command2test()
lst.append(bar)
cmds = ";".join(x for x in lst)
cmds_repr = "".join("\t\t{0}\n".format(cmd)
for cmd in cmds.split(';'))
start_t = _time()
answer = _send2input(scpi_obj, cmds)
answers = _cut_multiple_answer(answer)
n_answers = len(answers)
if '' in answers or 'ACK' in answers or 'NOK' in answers:
failed += 1
else:
correct += 1
log[n_answers] = (_time() - start_t)*1000
print("\tRequest {0:d} attributes in a single query: \n"
"{1}\tAnswer: {2!r} ({3:d}, {4:g} ms)\n"
"".format(i, cmds_repr, answer, n_answers, log[n_answers]))
if n_answers != i:
raise AssertionError(
"The answer doesn't have the {0:d} expected elements "
"(but {1:d})"
"".format(i, n_answers))
_inter_test_wait()
msg = "\tSummary:"
for length in log:
t = log[length]
msg += "\n\t\t{0}\t{1:6.3f} ms\t{2:6.3f} ms/cmd" \
"".format(length, t, t/length)
print(msg)
if failed == 0:
result = True, "Many commands per query test PASSED"
else:
print("Failed {0}/{1}".format(failed, correct+failed))
result = False, "Many commands per query test FAILED"
# TODO: multiple writes
except Exception as exc:
print("\tUnexpected kind of exception! {0}".format(exc))
print_exc()
result = False, "Many commands per query test FAILED"
_print_footer(result[1])
return result
def check_idn(scpi_obj):
_print_header("Test instrument identification")
try:
identity = InstrumentIdentification('ALBA', 'test', 0, _version())
scpi_obj.add_special_command('IDN', identity.idn)
cmd = "*idn?"
answer = _send2input(scpi_obj, cmd)
print("\tRequest identification: {0}\n\tAnswer: {1!r}"
"".format(cmd, answer))
if answer.strip() != identity.idn():
result = False, "Identification test FAILED"
else:
result = True, "Identification test PASSED"
except Exception as exp:
print("\tUnexpected kind of exception! {0}".format(exp))
print_exc()
result = False, "Identification test FAILED"
_print_footer(result[1])
return result
def lock_take(lock_obj):
test_name = "Initial state test"
_print_header("Test the initial state of the {} object".format(lock_obj))
_print_info("{!r}".format(lock_obj), 1)
_print_info("Check if it is lock", level=1, top=True)
if lock_obj.isLock():
return False, "{} FAILED".format(test_name)
_print_info("{} is not lock".format(lock_obj), level=1, bottom=True)
_print_info("Check if it lock can be requested", level=1, top=True)
if not lock_obj.request():
return False, "{} FAILED".format(test_name)
_print_info("{!r} is now lock".format(lock_obj), level=1, bottom=True)
_print_info("Check if it lock can be released", level=1, top=True)
if not lock_obj.release():
return False, "{} FAILED".format(test_name)
_print_info("{!r} is now released".format(lock_obj), level=1, bottom=True)
return True, "{} PASSED".format(test_name)
def check_read_with_params(scpi_obj):
_print_header("Attribute read with parameters after the '?'")
try:
cmd = 'reader:with:parameters'
long_test = ArrayTest(100)
scpi_obj.add_command(cmd, read_cb=long_test.readRange)
answer = _send2input(scpi_obj, "DataFormat ASCII", check_answer=False)
correct, failed = 0, 0
for i in range(10):
bar, foo = _randint(0, 100), _randint(0, 100)
start = min(bar, foo)
end = max(bar, foo)
# introduce a ' ' (write separator) after the '?' (read separator)
cmd_with_params = "{0}?{1:>3},{2}".format(cmd, start, end)
try:
answer = _send2input(
scpi_obj, cmd_with_params, bad_answer='NOK\r\n')
except ValueError as exc:
msg = "Error: {0}".format(exc)
failed += 1
else:
msg = "Answer: {0!r} (len ({1:d})" \
"".format(answer, len(answer))
correct += 1
print("\tRequest {0!r}\n\t{1}\n".format(cmd_with_params, msg))
if answer is None or len(answer) == 0:
raise ValueError("Empty string")
cmd_with_params = "{0}?{1},{2}".format(cmd, start, end)
if failed == 0:
result = True, "Read with parameters test PASSED"
else:
print("Failed {0}/{1}".format(failed, correct+failed))
result = False, "Read with parameters test FAILED"
except Exception as exc:
print("\tUnexpected kind of exception! {0}".format(exc))
print_exc()
result = False, "Read with parameters test FAILED"
_print_footer(result[1])
return result
def test_scpi(debug, pause, no_remove):
start_t = _time()
_print_header("Testing scpi main class (version {0})".format(_version()))
# ---- BuildSpecial('IDN',specialSet,identity.idn)
with scpi(local=True, debug=debug, write_lock=True) as scpi_obj:
print("Log information: {0}".format(scpi_obj.logging_file()))
results = []
result_msgs = []
try:
for test in [
check_idn,
check_wo_special_cmds,
add_invalid_cmds,
add_valid_commands,
check_command_queries,
check_command_writes,
check_nonexisting_commands,
check_array_answers,
check_multiple_commands,
check_read_with_params,
check_write_without_params,
# check_locks,
# check_telnet_hooks,
]:
result, msg = test(scpi_obj)
results.append(result)
tag, value = msg.rsplit(' ', 1)
result_msgs.append([tag, value])
if _after_test_wait(pause) is False:
break
except KeyboardInterrupt:
print("Test interrupted...")
txt = "Tests completed (Ctrl+c to print the summary and end)"
_after_test_wait(no_remove, msg=txt, wait_time=0)
if all(results):
_print_header("All tests passed: everything OK ({:g} s)"
"".format(_time()-start_t))
else:
_print_header("ALERT!! NOT ALL THE TESTS HAS PASSED. Check the list "
"({:g} s)".format(_time()-start_t))
length = 0
for pair in result_msgs:
if len(pair[0]) > length:
length = len(pair[0])
for result in result_msgs:
print("{0}{1}\t{2}{3}".format(
result[0], " "*(length-len(result[0])),
result[1], " *" if result[1] == 'FAILED' else ""))
print("")
def multithreading_take(lock_obj):
def send_event(event_lst, who):
event_lst[who].set()
while event_lst[who].isSet(): # wait to the thread to work
_sleep(1)
test_name = "Lock take test"
_print_header("{} for {}".format(test_name, lock_obj))
joiner_event = _Event()
joiner_event.clear()
user_threads = []
request_events = []
access_events = []
release_events = []
print_lock = _Lock()
for i in range(2):
request_event = _Event()
access_event = _Event()
release_event = _Event()
user_thread = _Thread(target=thread_function,
args=(lock_obj, joiner_event, request_event,
access_event, release_event, print_lock),
name='{:d}'.format(i))
request_events.append(request_event)
access_events.append(access_event)
release_events.append(release_event)
user_threads.append(user_thread)
user_thread.start()
# here is where the test starts ---
try:
_print_info("Initial state {!r}\n".format(lock_obj),
level=1,
lock=print_lock)
if lock_obj.isLock():
return False, "{} FAILED".format(test_name)
_print_info("Tell the threads to access",
level=1,
lock=print_lock,
top=True)
send_event(access_events, 0)
send_event(access_events, 1)
_print_info("both should have had access",
level=1,
lock=print_lock,
bottom=True)
_print_info("Thread 0 take the lock",
level=1,
lock=print_lock,
top=True)
send_event(request_events, 0)
if not lock_obj.isLock() or lock_obj.owner != '0':
raise Exception("It shall be lock by 0")
_print_info("Tell the threads to access", level=1, lock=print_lock)
send_event(access_events, 0)
send_event(access_events, 1)
_print_info("0 should, but 1 don't",
level=1,
lock=print_lock,
bottom=True)
_print_info("Try to lock when it is already",
level=1,
lock=print_lock,
top=True)
send_event(request_events, 1)
if not lock_obj.isLock() or lock_obj.owner != '0':
raise Exception("It shall be lock by user 0")
_print_info("Tell the threads to access", level=1, lock=print_lock)
send_event(access_events, 0)
send_event(access_events, 1)
_print_info("0 should, but 1 don't",
level=1,
lock=print_lock,
bottom=True)
_print_info("Try to release by a NON-owner",
level=1,
lock=print_lock,
top=True)
send_event(release_events, 1)
if not lock_obj.isLock() or lock_obj.owner != '0':
raise Exception("It shall be lock by user 0")
_print_info("Tell the threads to access", level=1, lock=print_lock)
send_event(access_events, 0)
send_event(access_events, 1)
_print_info("0 should, but 1 don't",
level=1,
lock=print_lock,
bottom=True)
_print_info("release the lock", level=1, lock=print_lock, top=True)
send_event(release_events, 0)
if lock_obj.isLock():
raise Exception("It shall be released")
_print_info("Tell the threads to access", level=1, lock=print_lock)
send_event(access_events, 0)
send_event(access_events, 1)
_print_info("both should have had to",
level=1,
lock=print_lock,
bottom=True)
# TODO: timeout
_print_info("Thread 1 take the lock and expire it",
level=1,
lock=print_lock,
top=True)
send_event(request_events, 1)
if not lock_obj.isLock() or lock_obj.owner != '1':
raise Exception("It shall be lock by 1")
_print_info("Tell the threads to access", level=1, lock=print_lock)
send_event(access_events, 0)
send_event(access_events, 1)
_print_info("1 should, but 0 don't", level=1, lock=print_lock)
_print_info("Sleep {:d} seconds to expire the lock".format(
TEST_EXPIRATION_TIME),
level=1,
lock=print_lock)
_sleep(TEST_EXPIRATION_TIME)
_print_info("Tell the threads to access", level=1, lock=print_lock)
send_event(access_events, 0)
send_event(access_events, 1)
_print_info("both should have had to",
level=1,
lock=print_lock,
bottom=True)
answer = True, "{} PASSED".format(test_name)
except Exception as e:
print(e)
print_exc()
answer = False, "{} FAILED".format(test_name)
joiner_event.set()
while len(user_threads) > 0:
user_thread = user_threads.pop()
user_thread.join(1)
if user_thread.is_alive():
user_threads.append(user_thread)
print("All threads has finished")
return answer
def check_command_writes(scpi_obj):
_print_header("Testing to command writes")
try:
# simple commands ---
current_conf_obj = WattrTest()
scpi_obj.add_command('source:current:configure',
read_cb=current_conf_obj.readTest,
write_cb=current_conf_obj.writeTest)
voltage_conf_obj = WattrTest()
scpi_obj.add_command('source:voltage:configure',
read_cb=voltage_conf_obj.readTest,
write_cb=voltage_conf_obj.writeTest)
for inner in ['current', 'voltage']:
_do_write_command(scpi_obj, "source:{0}:configure".format(inner))
_wait(1) # FIXME: remove
# channel commands ---
_print_header("Testing to channel command writes")
base_cmd = 'writable'
w_obj = scpi_obj.add_component(base_cmd, scpi_obj.command_tree)
ch_cmd = 'channel'
ch_obj = scpi_obj.add_channel(ch_cmd, n_channels, w_obj)
ch_current_obj = WchannelTest(n_channels)
ch_voltage_obj = WchannelTest(n_channels)
for (subcomponent, sub_cmd_obj) in [('current', ch_current_obj),
('voltage', ch_voltage_obj)]:
subcomponent_obj = scpi_obj.add_component(subcomponent, ch_obj)
for (attr_name, attr_func) in [('upper', 'upperLimit'),
('lower', 'lowerLimit'),
('value', 'readTest')]:
if hasattr(sub_cmd_obj, attr_func):
if attr_name == 'value':
attr_obj = scpi_obj.add_attribute(
attr_name, subcomponent_obj,
read_cb=sub_cmd_obj.readTest,
write_cb=sub_cmd_obj.writeTest, default=True)
else:
cb_func = getattr(sub_cmd_obj, attr_func)
attr_obj = scpi_obj.add_attribute(
attr_name, subcomponent_obj, cb_func)
print("\nChecking one write multiple reads\n")
for i in range(n_channels):
rnd_ch = _randint(1, n_channels)
element = _random_choice(['current', 'voltage'])
_do_write_channel_command(
scpi_obj, "{0}:{1}".format(base_cmd, ch_cmd), rnd_ch,
element, n_channels)
_inter_test_wait()
print("\nChecking multile writes multiple reads\n")
for i in range(n_channels):
test_nwrites = _randint(2, n_channels)
rnd_chs = []
while len(rnd_chs) < test_nwrites:
rnd_ch = _randint(1, n_channels)
while rnd_ch in rnd_chs:
rnd_ch = _randint(1, n_channels)
rnd_chs.append(rnd_ch)
element = _random_choice(['current', 'voltage'])
values = [_randint(-1000, 1000)]*test_nwrites
_do_write_channel_command(
scpi_obj, "{0}:{1}".format(base_cmd, ch_cmd), rnd_chs,
element, n_channels, values)
_inter_test_wait()
print("\nChecking write with allowed values limitation\n")
selection_cmd = 'source:selection'
selection_obj = WattrTest()
selection_obj.writeTest(False)
scpi_obj.add_command(selection_cmd, read_cb=selection_obj.readTest,
write_cb=selection_obj.writeTest,
allowed_argins=[True, False])
_do_write_command(scpi_obj, selection_cmd, True)
# _do_write_command(scpi_obj, selection_cmd, 'Fals')
# _do_write_command(scpi_obj, selection_cmd, 'True')
try:
_do_write_command(scpi_obj, selection_cmd, 0)
except Exception:
print("\tLimitation values succeed because it raises an exception "
"as expected")
else:
raise AssertionError("It has been write a value that "
"should not be allowed")
_inter_test_wait()
result = True, "Command writes test PASSED"
except Exception as exc:
print("\tUnexpected kind of exception! {0}".format(exc))
print_exc()
result = False, "Command writes test FAILED"
_print_footer(result[1])
return result
def add_valid_commands(scpi_obj):
_print_header("Testing to build valid commands")
try:
# ---- valid commands section
current_obj = AttrTest()
voltage_obj = AttrTest()
# * commands can de added by telling their full name:
scpi_obj.add_command('source:current:upper',
read_cb=current_obj.upperLimit,
write_cb=current_obj.upperLimit)
scpi_obj.add_command('source:current:lower',
read_cb=current_obj.lowerLimit,
write_cb=current_obj.lowerLimit)
scpi_obj.add_command('source:current:value',
read_cb=current_obj.readTest,
default=True)
scpi_obj.add_command('source:voltage:upper',
read_cb=voltage_obj.upperLimit,
write_cb=voltage_obj.upperLimit)
scpi_obj.add_command('source:voltage:lower',
read_cb=voltage_obj.lowerLimit,
write_cb=voltage_obj.lowerLimit)
scpi_obj.add_command('source:voltage:value',
read_cb=voltage_obj.readTest, default=True)
scpi_obj.add_command('source:voltage:exception',
read_cb=voltage_obj.exceptionTest)
# * They can be also created in an iterative way
base_cmd_name = 'basicloop'
for (sub_cmd_name, sub_cmd_obj) in [('current', current_obj),
('voltage', voltage_obj)]:
for (attr_name, attr_func) in [('upper', 'upperLimit'),
('lower', 'lowerLimit'),
('value', 'readTest')]:
if hasattr(sub_cmd_obj, attr_func):
cb_func = getattr(sub_cmd_obj, attr_func)
if attr_name == 'value':
default = True
else:
default = False
scpi_obj.add_command("{0}:{1}:{2}".format(
base_cmd_name, sub_cmd_name, attr_name),
read_cb=cb_func, default=default)
# Basically is the same than the first example,
# but the add_command is constructed with variables
# in nested loops
# * Another alternative to create the tree in an iterative way would be
it_cmd = 'iterative'
it_obj = scpi_obj.add_component(it_cmd, scpi_obj.command_tree)
for (subcomponent, sub_cmd_obj) in [('current', current_obj),
('voltage', voltage_obj)]:
subcomponent_obj = scpi_obj.add_component(subcomponent, it_obj)
for (attr_name, attr_func) in [('upper', 'upperLimit'),
('lower', 'lowerLimit'),
('value', 'readTest')]:
if hasattr(sub_cmd_obj, attr_func):
cb_func = getattr(sub_cmd_obj, attr_func)
if attr_name == 'value':
default = True
else:
default = False
attr_obj = scpi_obj.add_attribute(
attr_name, subcomponent_obj, cb_func, default=default)
else:
print("{0} hasn't {1}".format(subcomponent_obj, attr_func))
# In this case, the intermediate objects of the tree are
# build and it is in the inner loop where they have the
# attributes created.
# * Use with very big care this option because the library
# * don't guarantee that all the branches of the tree will
# * have the appropriate leafs.
# * Example of how can be added a node with channels in the scpi tree
ch_cmd = 'channel'
ch_obj = scpi_obj.add_channel(
ch_cmd, n_channels, scpi_obj.command_tree)
ch_current_obj = ChannelTest(n_channels)
ch_voltage_obj = ChannelTest(n_channels)
for (subcomponent, sub_cmd_obj) in [('current', ch_current_obj),
('voltage', ch_voltage_obj)]:
subcomponent_obj = scpi_obj.add_component(subcomponent, ch_obj)
for (attr_name, attr_func) in [('upper', 'upperLimit'),
('lower', 'lowerLimit'),
('value', 'readTest')]:
if hasattr(sub_cmd_obj, attr_func):
cb_func = getattr(sub_cmd_obj, attr_func)
if attr_name == 'value':
default = True
else:
default = False
attr_obj = scpi_obj.add_attribute(
attr_name, subcomponent_obj, cb_func, default=default)
# * Example of how can be nested channel type components in a tree that
# already have this channels componets defined.
meas_cmd = 'measurements'
meas_obj = scpi_obj.add_component(meas_cmd, ch_obj)
fn_cmd = 'function'
fn_obj = scpi_obj.add_channel(fn_cmd, n_subchannels, meas_obj)
chfn_current_obj = SubchannelTest(n_channels, n_subchannels)
chfn_voltage_obj = SubchannelTest(n_channels, n_subchannels)
for (subcomponent, sub_cmd_obj) in [('current', chfn_current_obj),
('voltage', chfn_voltage_obj)]:
subcomponent_obj = scpi_obj.add_component(subcomponent, fn_obj)
for (attr_name, attr_func) in [('upper', 'upperLimit'),
('lower', 'lowerLimit'),
('value', 'readTest')]:
if hasattr(sub_cmd_obj, attr_func):
cb_func = getattr(sub_cmd_obj, attr_func)
if attr_name == 'value':
default = True
else:
default = False
attr_obj = scpi_obj.add_attribute(
attr_name, subcomponent_obj, cb_func, default=default)
print("Command tree build: {!r}".format(scpi_obj.command_tree))
result = True, "Valid commands test PASSED"
# TODO: channels with channels until the attributes
except Exception as exc:
print("\tUnexpected kind of exception! {0}".format(exc))
print_exc()
result = False, "Valid commands test FAILED"
_print_footer(result[1])
return result
