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#!/usr/bin/env python
"""
Simple script that demonstrates how to use the epics.autosave module to
save & restore PV values using request files and savefiles, like with synApps
autosave (only via CA.)
Run ./save_restore.py -h for a full usage summary.
"""
from optparse import *
from epics.autosave import *
def main():
(options, args) = get_validate_args()
methods = { "restore" : do_restore, "save" : do_save }
methods[options.mode](options.debug, args)
def do_restore(debug, args):
print "Restoring PVs from save file %s..." % (args[0])
if not restore_pvs(args[0], debug):
sys.exit(1)
def do_save(debug, args):
print "Saving PVs in %s to save file %s..." % (args[0], args[1])
try:
save_pvs(args[0], args[1], debug)
except Exception,e:
sys.exit("Failed to save pvs: %s" % e)
def get_validate_args():
"""
Parse and validate command-line arguments
"""
usage = "usage: %prog [options] [restore-file] save-file"
parser = OptionParser(usage=usage, description="Save & restore EPICS pvs via Channel Access. Options --save & --restore are not required, if they are ommitted then the mode will be inferred from the number of arguments.")
group = OptionGroup(parser, "Mode")
group.add_option("-r", "--restore", action="store_const", const="restore", dest="mode",
help="Restore PV values saved in <save-file>")
group.add_option("-s", "--save", action="store_const", const="save", dest="mode",
help="Save PV values in named in <restore-file> to <save-file>")
parser.add_option_group(group)
group = OptionGroup(parser, "Debug Options")
group.add_option("-d", "--debug", dest="debug", action="store_true",
help="Print each PV as it is saved/restored")
parser.add_option_group(group)
(options, args) = parser.parse_args()
if options.mode is None and len(args) == 2:
options.mode = "save"
else:
options.mode = "restore"
if options.mode == "save":
if len(args) != 2:
parser.error("Saving pvs requires two arguments - restore-file save-file")
elif options.mode == "restore":
if len(args) != 1:
parser.error("Restoring pvs requires one argument - save-file")
else:
parser.error("Unexpected command line arguments")
return (options, args)
if __name__ == "__main__":
main()
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