screeps/role.upgrader.js

var roleUpgrader = {

    /** @param {Creep} creep **/
    run: function(creep) {
        console.log(creep, "running Upgrade");

        if(creep.memory.upgrading && creep.carry.energy == 0) {
            creep.memory.upgrading = false;
	    }
	    if(!creep.memory.upgrading && creep.carry.energy == creep.carryCapacity) {
	        creep.memory.upgrading = true;
	    }

	    if(creep.memory.upgrading) {
            if(creep.upgradeController(creep.room.controller) == ERR_NOT_IN_RANGE) {
                console.log("\tmoving to", creep.room.controller);
                creep.moveTo(creep.room.controller);
            }
        }
        else {
            var source = creep.pos.findClosestByPath(FIND_SOURCES);
            if(creep.harvest(source) == ERR_NOT_IN_RANGE) {
                console.log("\tmoving to", source);
                creep.moveTo(source);
            }
        }
	}
};

module.exports = roleUpgrader;