Writing NeXus files configured by the Component Selector

Information from the Selector Server can be used also outside Sardana. The following script demonstrates how to perform a simple scan using Components and User Data from selected by the Component Selector.

#!/bin/env python

import PyTango
import json
from datetime import datetime
from pytz import timezone

## NeXus file name and timezone info
nxsfile = '/tmp/example1.nxs'
berlin = timezone('Europe/Berlin')
fmt = '%Y-%m-%dT%H:%M:%S.%f%z'

# Selector Server
selector = PyTango.DeviceProxy("p09/nxsrecselector/hastodt")
# NeXus Writer
writer = PyTango.DeviceProxy(selector.WriterDevice)

# selected components
components = list(selector.Components or [])

# user data
datarecord = selector.UserData

# configuration variables
confvars = selector.ConfigVariables
selector.updateConfigVariables()

# create configuration
finalXML = selector.CreateWriterConfiguration(components)
print finalXML

# open the file
writer.Init()
writer.FileName = nxsfile
writer.OpenFile()
writer.XMLSettings = finalXML

# get start_time
starttime = berlin.localize(datetime.now())

# open the entry
record = {}
record["data"] = json.loads(datarecord)
record["data"]["start_time"] = str(starttime.strftime(fmt))
writer.JSONRecord  = json.dumps(record)
writer.OpenEntry()

# experimental loop
for i in range(10):
    srecord = {}
    ## setting CLIENT data
    srecord["data"] = {"point_nb": i}
    writer.Record(json.dumps(srecord))

#close the entry
endtime = berlin.localize(datetime.now())
record["data"]["end_time"] = str(endtime.strftime(fmt))
writer.JSONRecord  = json.dumps(record)
writer.CloseEntry()

#close the file
writer.CloseFile()