Complete list of all tag names that are valid on the controller

[SerafinTech]

A user contacted me by email and wanted to see a way to get a complete list of all tag names that would valid on the controller including drilling down through arrays and structures. I came up with this solution. Would this be useful as a utility function?

const eip = require('st-ethernet-ip')

let cont = new eip.Controller()

cont.connect('192.168.121.10')
    .then(async () => {

        let directory = {}

        // Separate tags by program / controller scope
        cont.tagList.forEach( t => {
            directory[t.program] = [];
        })

        // Iterate through each scope
        for (program in directory) {
            let nameList = []
            let progValue = (program === 'null') ? null : program;
            let taglist = cont.tagList.filter(t2 => t2.program === progValue);

            // Iterate through each tag of each scope
            for (let i = 0; i < taglist.length; i++) {
                await drillDown(cont, nameList, taglist[i])
            }
            
            directory[program] = nameList
        }

        // Change 'null' name to 'Controller'
        directory['Controller'] = directory['null']
        delete directory.null

        console.log(directory)

    })

// Recursive tag name listing function
async function drillDown(cont, nameList, tagInfo, previousName) {
    let tagLength = 1;
    if (tagInfo.type.arrayDims > 0) {
        if (tagInfo.info === undefined) {
            let contTag = cont.newTag(tagInfo.name, tagInfo.program, false, 1);
            tagLength = await cont.getTagArraySize(contTag); 
        } else {
            tagLength = tagInfo.info;
        }
        for (let i = 0; i < tagLength; i++) {
            let newName
            if (previousName) {
                newName = previousName + '.' + tagInfo.name + '[' + i + ']';
            } else {
                newName = tagInfo.name + '[' + i + ']';
            }

            nameList.push(newName);

            if (tagInfo.type.structure) {
                let members = cont.templateList[tagInfo.type.code]._members;
                for (let a = 0; a < members.length; a++) {
                    await drillDown(cont, nameList, members[a], newName);
                }
            }

        }
    } else {
        let newName
        if (previousName) {
            newName = previousName + '.' + tagInfo.name 
        } else {
            newName = tagInfo.name
        }

        nameList.push(newName);

        if (tagInfo.type.structure) {
            let members = cont.templateList[tagInfo.type.code]._members;
            for (let a = 0; a < members.length; a++) {
                await drillDown(cont, nameList, members[a], newName);
            }
        }
    }
    
}