def restore_pvs(filepath, debug=False):
"""
Restore pvs from a save file via Channel Access
debug - Set to True if you want a line printed for each value set
Returns True if all pvs were restored successfully.
"""
success = True
fout = open(filepath, 'r')
lines = fout.readlines()
fout.close()
for line in lines:
if line.startswith('<END'):
break
if line.startswith('#'):
continue
pvname, value = [w.strip() for w in line[:-1].split(' ', 1)]
if value.startswith(
'<JSON>:'): # for older version, could be deprecated
value = value.replace('<JSON>:', '@array@')
if value.startswith('@array@'):
value = value.replace('@array@', '').strip()
if value.startswith('{') and value.endswith('}'):
value = value[1:-1]
value = json.loads(value)
if debug:
print("Setting %s to %s..." % (pvname, value))
try:
thispv = PV(pvname)
thispv.connect()
if not thispv.connected:
print("Cannot connect to %s" % (pvname))
elif not thispv.write_access:
print("No write access to %s" % (pvname))
else:
thispv.put(value, wait=False)
except:
exctype, excvalue, exctrace = sys.exc_info()
print("Error restoring %s to %s : %s" %
(pvname, value, exctype, excvalue))
success = False
return success
def restore_pvs(filepath, debug=False):
"""
Restore pvs from a save file via Channel Access
debug - Set to True if you want a line printed for each value set
Returns True if all pvs were restored successfully.
"""
success = True
fout = open(filepath, 'r')
lines = fout.readlines()
fout.close()
for line in lines:
if line.startswith('<END'):
break
if line.startswith('#'):
continue
pvname, value = [w.strip() for w in line[:-1].split(' ', 1)]
if value.startswith('<JSON>:'): # for older version, could be deprecated
value = value.replace('<JSON>:', '@array@')
if value.startswith('@array@'):
value = value.replace('@array@', '').strip()
if value.startswith('{') and value.endswith('}'):
value = value[1:-1]
value = json.loads(value)
if debug:
print( "Setting %s to %s..." % (pvname, value))
try:
thispv = PV(pvname)
thispv.connect()
if not thispv.connected:
print("Cannot connect to %s" % (pvname))
elif not thispv.write_access:
print("No write access to %s" % (pvname))
else:
thispv.put(value, wait=False)
except:
exctype, excvalue, exctrace = sys.exc_info()
print("Error restoring %s to %s : %s" % (pvname, value,
exctype, excvalue))
success = False
return success
def connect_to_pv(pv_name, n_connection_attempts=3):
"""
Start a connection to a PV.
:param pv_name: PV name to connect to.
:param n_connection_attempts: How many times you should try to connect before raising an exception.
:return: PV object.
:raises ValueError if cannot connect to PV.
"""
pv = PV(pv_name, auto_monitor=False)
for i in range(n_connection_attempts):
if pv.connect():
return pv
sleep(0.1)
raise ValueError("Cannot connect to PV '%s'." % pv_name)
pv_names = [i['pvname'] for i in all_pvs[N0:N0+NMAX]]
# create
pvs = []
t0 = time.time()
for pvname in pv_names:
o = PV(pvname)
pvs.append(o)
t1 = time.time()
# connect
unconnected = 0
for o in pvs:
o.connect(timeout=0.1)
if not o.connected:
unconnected += 1
t2 = time.time()
# get
out = []
for o in pvs:
if o.connected:
v = o.get()
out.append('%s = %s' % (o.pvname, repr(v)))
t3 = time.time()
print " %i PVS connected and fetched in %.4f seconds. %i PVs did not connect." %(NMAX, t3-t0, unconnected)
pv_names = [i['pvname'] for i in all_pvs[N0:N0 + NMAX]]
# create
pvs = []
t0 = time.time()
for pvname in pv_names:
o = PV(pvname)
pvs.append(o)
t1 = time.time()
# connect
unconnected = 0
for o in pvs:
o.connect(timeout=0.1)
if not o.connected:
unconnected += 1
t2 = time.time()
# get
out = []
for o in pvs:
if o.connected:
v = o.get()
out.append('%s = %s' % (o.pvname, repr(v)))
t3 = time.time()
print " %i PVS connected and fetched in %.4f seconds. %i PVs did not connect." % (
