Adding mulitple variables at once in OPCUA Server

[vidyarao123]

Hi,

We are working on adding approximately 20000 variables in OPCUA Server from CSV / Excel. The addition is successful but iterating the below line by using a for loop for 20000 variables is a time consuming task.
OPC_Tag = Param.add_variable(addspace,Tag,0)

So we wanted to know, if there is a way to add such huge quantity of tags at a faster rate to server.

Thanks

[AndreasHeine]

does they change while runtime or are they always the same?

[AndreasHeine]

if i remember right there is the possibility to use a shelffile!

[vidyarao123]

Do you mean this module ?
shelve — Python object persistence¶

[vidyarao123]

Correct me if I am wrong. The shelve module is just an alternative for the list as I understand. But I am trying to achieve is the add all variables parallely. Instead of a sequential method.

[AndreasHeine]

you should look in the code below

Server:

python-opcua/opcua/server/server.py

Line 80 in 0d595e5

def __init__(self, shelffile=None, iserver=None):

python-opcua/opcua/server/server.py

Line 92 in 0d595e5

self.iserver = InternalServer(shelffile = shelffile)

InternalServer:

python-opcua/opcua/server/internal_server.py

Line 100 in 0d595e5

def load_standard_address_space(self, shelffile=None):

python-opcua/opcua/server/internal_server.py

Line 159 in 0d595e5

def load_address_space(self, path):

python-opcua/opcua/server/internal_server.py

Line 165 in 0d595e5

def dump_address_space(self, path):

[zerox1212]

if i remember right there is the possibility to use a shelffile!

Shelf only works for standard address space! It won't save user added nodes!

[oroulet]

look at code of create_variable() and write your low level code yourself.
But anyway adding new nodes is crazy time consuming. That is why we do not read the xml standard address space from xml at startup but generate python code from the xml and execute it.

[zerox1212]

I have used dump and load to make the nodes in the address space persistent. Then when server starts just check if the dump file exists, and if it does load from there. Server will start very fast.

Note that this is different than using a shelf!!!

python-opcua/opcua/server/address_space.py

Line 563 in 0d595e5

def dump(self, path):

Read the docs around those functions though... they have some limitations.