UaFile: Comfort method to write file

[martigr]

Currently it is possible to write a file with the low-level file services, but the comfort function in asyncua/client/ua_file.py is missing.

I have now added the write() method to asyncua/client/ua_file.py. This allows to write a file comfortably without using the low-level functions.

async with Client(url=url) as client:
    file_node = client.get_node("ns=2;s=NameOfNode")
    async with UaFile(file_node, 'w') as ua_file:
        with open("filename.txt", 'rb') as fd:
            data = fd.read()
            await ua_file.write(data) # write file

[AndreasHeine]

what if the file is larger then the avalible memmory?

using a iterator of a fileobject:

for line in file:
    print(line)

[schroeder-]

what if the file is larger then the avalible memmory?

This is not a problem because most opc ua servers doesn't allow more than 16mb of data in one service call.

[martigr]

what if the file is larger then the avalible memmory?

using a iterator of a fileobject:

for line in file:
    print(line)

The code snippet in my comment is just an example of the usage.
I agree that some memory issues could occur. In a real world application writing in chunks would be better.

[AndreasHeine]

what if the file is larger then the avalible memmory?

This is not a problem because most opc ua servers doesn't allow more than 16mb of data in one service call.

the thing i am thinking of is do i really need the whole file in ram (maybe not the only file ^^)
maybe i am overconcerned...