Calculating player speed server-side

[o7q]

Description

I am trying to calculate player speed on the server. I can easily do it client side but the methods I use do not work the same on the server.

I am using the player.getX() and player.prevX variables. These work perfectly fine on the client but they return the exact same value on the server.

Server-side getX() and prevX values

double x = player.getX();
double prevX = player.prevX;

LOGGER.info("X: " + String.valueOf(x));
LOGGER.info("prevX: " + String.valueOf(prevX));

The function is being called from an AttackEntityCallback event

AttackEntityCallback.EVENT.register((player, world, hand, entity, hitResult) -> {
	if (!world.isClient)
	{
		handleAttack(player);
	}
	return ActionResult.PASS;
});

I have been stuck on this question for the past year, worked on it on and off. I cannot find a good way to do this. I have asked around in the Discord, read the wiki, no luck yet. I presume it's something incredibly simple, I have yet to find it.

[Octol1ttle]

Use player.getVelocity() instead

[o7q]

player.getVelocity() only grabs the air velocity, it is always 0 when the player is grounded. I'd like a method that would be equivalent to taking the difference between player.prevX/Y/Z and player.getPos(). This way I don't have to worry about other mods, potion effects, or any other things that could interfere with velocity/is not included in player.getVelocity().