def pipeBusSource(name, entity, busKey, structure, fmtBusPipe, fmtBusPipeToggle):
    if "toggle" in entity.pipes[name]:
        return fmtBusPipeToggle \
            .replace("%BUS_KEY%", busKey) \
            .replace("%BUS_VALUE_TYPE%", "Void")

    valueType = structure.model.fields[name][0]
    return fmtBusPipe \
        .replace("%BUS_KEY%", busKey) \
        .replace("%BUS_VALUE_TYPE%", valueType)