def _on_response(self, response: Response) -> None:
# called from tornado thread
message = json_encode(response)
try:
self.write_message(message)
except WebSocketError:
# The websocket is dead. If the response was a Delta or Update, then
# unsubscribe so the local controller doesn't keep on trying to
# respond
if isinstance(response, (Delta, Update)):
# Websocket is dead so we can clear the subscription key.
# Subsequent updates may come in before the unsubscribe, but
# ignore them as we can't do anything about it
mri = self._id_to_mri.pop(response.id, None)
if mri:
log.info("WebSocket Error: unsubscribing from stale handle")
unsubscribe = Unsubscribe(response.id)
unsubscribe.set_callback(self.on_response)
if self._registrar:
self._registrar.report(
builtin.infos.RequestInfo(unsubscribe, mri)
)
finally:
assert self._queue, "No queue"
cothread.Callback(self._queue.put, None)
def post(self, mri, method, args):
req = HTTPRequest(
"http://localhost:%s/rest/%s/%s" % (self.socket, mri, method),
method="POST",
body=args,
)
result = yield self.http_client.fetch(req)
cothread.Callback(self.result.put, result)
def post(self, mri, method, args):
req = HTTPRequest(
f"http://localhost:{self.socket}/rest/{mri}/{method}",
method="POST",
body=args,
)
result = yield self.http_client.fetch(req)
cothread.Callback(self.result.put, result)
def Thread():
for pv in sys.argv[1:]:
print(pv, '=>', end=' ')
try:
v = cothread.CallbackResult(caget, pv)
print(v)
except:
print('failed')
traceback.print_exc()
cothread.Callback(cothread.Quit)
def unsubscribe_all(self, callback=False):
"""Send an unsubscribe for all active subscriptions"""
futures = ((f, r) for f, r in self._requests.items()
if isinstance(r, Subscribe)
and f not in self._pending_unsubscribes)
if futures:
for future, request in futures:
if callback:
log.warning(f"Unsubscribing from {request.path}")
cothread.Callback(self.unsubscribe, future)
else:
self.unsubscribe(future)
def send_messages(self, messages, convert_json=True):
conn = yield websocket_connect("ws://localhost:%s/ws" % self.socket)
num = len(messages)
for msg in messages:
if convert_json:
msg = json_encode(msg)
conn.write_message(msg)
for _ in range(num):
resp = yield conn.read_message()
resp = json.loads(resp)
cothread.Callback(self.result.put, resp)
conn.close()
def sendWfToPv(self, pv_name):
try:
#print("[debug] self.msg: %s" % self.msg);
#print("[debug] len(self.msg): %s" % len(self.msg));
if len(self.msg) != 0:
cothread.Callback(caput, pv_name, self.msg)
return True
return False
except Exception as e:
print("Trouble when Publishing to PV with " + pv_name + ": " +
str(e))
logging.info("Trouble when Publishing to PV with " + pv_name +
": " + str(e))
def producer(event, count):
''' this is a different thread from that running the cosumer code'''
for n in "ABCDE":
print('thread tick', n)
try:
# can't Signal from a different thread
if n == "E": event.Signal(n)
except AssertionError as e:
print(f"{e}")
# must use the following to talk across thread boundaries:
cothread.Callback(signalViaCallback, n)
time.sleep(0.5)
def updatePv(self, value):
try:
pv_val = value
if self.datatype == "wfint":
self.wfToWf(value)
else:
if self.datatype == "wfint1":
pv_val = self.wfToScalar(value)
elif self.datatype == "int":
pv_val = self.intToScalar(value)
cothread.Callback(caput, self.pv, pv_val)
except Exception as e:
print("Trouble in updatePv with " + self.pv + ":\n" +
traceback.format_exc())
logging.info("Trouble when Publishing to PV with " + self.pv +
": " + str(e))
def get(self, mri):
result = yield self.http_client.fetch("http://localhost:%s/rest/%s" %
(self.socket, mri))
cothread.Callback(self.result.put, result)
def spawn(self, f, *args, **kwargs):
"""Can be called from any thread"""
cothread.Callback(self.q.Signal, (f, args, kwargs))
def signaller(name):
n = 0
while True:
n += 1
cothread.Callback(do_signal, name, n)
time.sleep(0.1 * numpy.random.random())
def get(self, mri):
result = yield self.http_client.fetch(
f"http://localhost:{self.socket}/rest/{mri}")
cothread.Callback(self.result.put, result)
def _communicate_thread(self, input_):
"""Executes in separate OS thread. Wait for communication
then return the output to the cothread context.
"""
output = self._process.communicate(input_)
cothread.Callback(self._communicate_callback, output)