def __init__(self, ch=0, ch_scanner='melba_020:scan:'):
QObject.__init__(self) # Initiate pyqtSignal
self.ch = ch
self.scanner = ch_scanner
self.data = pd.Series()
self.delay = 0.5 # Predefined delay in seconds between processing of record
self.pv = {
'nos':
PV(self.scanner + 'datach' + str(self.ch) + '_noofsamples_get'),
'samples':
PV(self.scanner + 'datach' + str(self.ch) + '_samples_get')
}
self.pv['nos'].get()
time.sleep(0.2)
self.pv['samples'].get()
time.sleep(0.2)
# Debug
for k in self.pv.keys():
print("ch{} : self.pv[{}].value = {}".format(
self.ch, k, self.pv[k].value))
print("ch{} : type(self.pv[{}].value) = {}".format(
self.ch, k, type(self.pv[k].value)))
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)
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)
pvconnectedstatus=thispv.wait_for_connection()
if not pvconnectedstatus:
print("Cannot connect to %s" % (pvname))
success = False
elif not thispv.write_access:
print("No write access to %s" % (pvname))
success = False
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
values = [x for x in sav_file.parseFile(filepath).asList() if len(x) > 0]
print("Restoring %d values..." % (len(values)))
for v in values:
if debug:
print("Setting %s to %s..." % (v[0], v[1]))
try:
pv = PV(v[0])
pv.put(v[1]) # hopefully this is good enough as conversions go
except Exception(e):
print("Error restoring %s to %s : %s" % (v[0], v[1], e))
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
values = [ x for x in sav_file.parseFile(filepath).asList() if len(x) > 0 ]
print( "Restoring %d values..." % ( len(values) ))
for v in values:
if debug:
print( "Setting %s to %s..." % (v[0], v[1]))
try:
pv = PV(v[0])
pv.put(v[1]) # hopefully this is good enough as conversions go
except Exception(e):
print( "Error restoring %s to %s : %s" % (v[0], v[1], e))
success = False
return success
def save_pvs(request_file, save_pvs, debug=False):
"""
Save pvs from a request file to a save file, via Channel Access
Set debug=True to print a line for each PV saved.
With throw an exception if any PV cannot be found.
"""
pvnames = _parse_request_file(request_file)
pv_vals = [(pvname, PV(pvname).get()) for pvname in pvnames]
if debug:
for (pv, val) in pv_vals:
print("PV %s = %s" % (pv, val))
f = open(save_pvs, "w")
f.write("# File saved automatically by save_restore.py on %s\n" %
datetime.datetime.now().isoformat())
f.write("# Edit with extreme care.\n")
f.writelines(["%s %s\n" % v for v in pv_vals])
f.write("<END>\n")
f.close()
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 save_pvs(request_file, save_pvs, debug=False):
"""
Save pvs from a request file to a save file, via Channel Access
Set debug=True to print a line for each PV saved.
Will print a warning if a PV cannot connect.
"""
pv_vals = []
pvobjs = [PV(pvn) for pvn in _parse_request_file(request_file)]
[pv.connect() for pv in pvobjs]
for thispv in pvobjs:
pvname = thispv.pvname
thispv.connect()
if not thispv.connected:
print("Cannot connect to %s" % (pvname))
continue
if thispv.count == 1:
value = str(thispv.get())
elif thispv.count > 1 and thispv.type == 'char':
value = thispv.get(as_string=True)
elif thispv.count > 1 and thispv.type != 'char':
value = '@array@ %s' % json.dumps(thispv.get().tolist())
pv_vals.append((pvname, value))
if debug:
for (pv, val) in pv_vals:
print("PV %s = %s" % (pv, val))
f = open(save_pvs, "w")
f.write("# File saved by pyepics autosave.save_pvs() on %s\n" %
datetime.datetime.now().isoformat())
f.write("# Edit with extreme care.\n")
f.writelines(["%s %s\n" % v for v in pv_vals])
f.write("<END>\n")
f.close()
if len(sys.argv) > 2:
N0 = int(sys.argv[2])
master = EpicsArchiver.MasterDB()
all_pvs = master.cache.select('*')
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 = []
NMAX = int(sys.argv[1])
N0 = 0
if len(sys.argv) > 2:
N0 = int(sys.argv[2])
master = EpicsArchiver.MasterDB()
all_pvs = master.cache.select('*')
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 = []
