Best Attacks Against Bunker Early Game StarCraft 2?

I attempted, as Protoss, to rush a Terran player who had blocked off their ramp with two bunkers loaded up with Marines and Marauders with SCVs repairing them.

They easily destroyed my stalkers while taking no losses (other than minerals spend repairing the bunkers).

I've never seen it before - normally I see Terran block off with supply depots, Engineering bays, bunkers or factories. I can normally return fire against their marines over their wall to do some damage and apply some pressure, but as the marines were in bunkers, my losses were far greater than theirs.

I'm wondering if there was a better tactic I could have used to apply pressure early game? Should more Terran players be using bunkers instead of other buildings to wall off?

I'm also curious how Terran or Zerg players could best handle this. I guess Terran could delay their attack by a bit to wait for Siege Tanks, while Zerg roaches with burrow could alternate between attacking and healing. Should I have waited for void rays as Protoss?