Dynamic inputs based on whether other inputs are connected about flume

[wlievens]

This works, though I'm sure it's possible to write it shorter and/or more ideomatically:

inputs: ports => (data, connections) => {
    const inputs = [];
    const inputIndexes = Object.keys(connections.inputs).map(input => parseInt(input.substring('flow'.length)));
    const maxIndex = inputIndexes.length > 0 ? Math.max(...inputIndexes) : 1;
    for (let index = 1; index <= maxIndex; ++index) {
        inputs.push(ports.flow({
            name: `flow${index}`,
            label: `Flow [${index}]`
        }));
    }
    const links = connections.inputs[inputs[inputs.length - 1].name];
    if (links && links.length > 0) {
        const index = maxIndex + 1;
        inputs.push(ports.flow({
            name: `flow${index}`,
            label: `Flow [${index}]`
        }));
    }
    return inputs;
}

[chrisjpatty]

Thanks! Yeah so the function signature for dynamic inputs actually includes the connections as a second parameter. Let me know if that isn't working on your end: https://flume.dev/docs/flume-config#advanced-inputs-usage.

[wlievens]

I seem to have missed that, thanks. This works great

inputs: ports => (data, connections) => {
    const inputs = [];
    let index = 1;
    while (true) {
        const name = `flow${index}`;
        inputs.push(ports.flow({
            name: name,
            label: `Flow [${index}]`
        }));
        const links = connections.inputs[name];
        if (links === undefined || links.length === 0) {
            break;
        }
        index = index + 1
    }
    return inputs;
}

Update: well not quite but that's my fault - if I disconnect an earlier input it kills the one after. I'll improve the code and repost it here for follow-up, but as far as I'm concerned this ticket can be closed.