ServerRpc can't see updated property

[pastel dagger]

As my understanding, when you create networkbehaviour class with property without syncvar, class holds 2 different property on both client and server. If this assumption is true, why i can't see updated variable inside of ServerRpc function?

public class Test: NetworkBehaviour { 

  private List<int> list = new();

  void Start()
  {
    list.Add(1);
  }

  [ServerRpc]
  public void GetValue()
  {
    Debug.Log("list count: " + list.Count); // why it prints 0?
  }

  void Update()
  {
     if (!IsServerInitialized) return;

     if (Input.Triggers) {
        GetValue();
     } 
  }
}

ServerRpc can't see updated property

[hard lintel]

Cause server do not know which value to get.. you need to put the value throgh server to update then server will know

[serverRpc]
ObserverUpdateMyValue()
[observerRpc]
Value +=1

then ask for the value

it is better to use syncvar if it is constantly changing. Also you can update direcly from ServerRPC .. if you do not need to change anything on observer

[pastel dagger]

just testing around and trying to syncvar bevahiour without syncvar. So what i trying to achieve is server update value time to time, client calls serverrpc when value needed. but server not accessing its value.

[hard lintel]

void Start()
{
list.Add(1);
}

this is called on locally .. not on server.. inside server also locally

[pastel dagger]

yes, but doesn't that GetValue function bind to local instance class?

[hard lintel]

locally you can ask... but not inside serverRPc

 void Start()
  {
   if(isOwner)
    GetValue()
  }

  [ServerRpc]
  public void GetValue()
  {
    list.Add(1);
  }

[pastel dagger]

i understand that behaviour, but i want list updated outside rpc.

list is updated on the server only, then i want values on client.

i know its perfect case for sync var, but without sync var how i get it? possible?

[hard lintel]

this is not syncvar .. this is just asking server to change my value. syncvar will autometically do that

but locally . do you mean in server ?

[Server]
void Changemyvalue(){}

[pastel dagger]

client is not asking change value just getting value? server updates value on its own.

[hard lintel]

yes now i understood

this is what you need

[Server]
void Changemyvalue(){
list.Add(1);
} 

so it will only change value in server

now u can call inside client

void Update()
  {
     if (!IsServerInitialized) return;

     if (Input.Triggers) {
        GetValue();
     } 
  }
[ServerRpc]
  public void GetValue()
  {
    Debug.Log("list count: " + list.Count); // why it prints 0?
  }

[pastel dagger]

let me try quickly on my end.

[hard lintel]

sure

but this will not change value in client.. only in server

[pastel dagger]

yes only on server, so client can get that updated value?

[hard lintel]

yes

I think you want to make it so user can;t cheat.. am i right ?

[pastel dagger]

no i doesn't work as expected. yeah basically trying out server auth cases and figure out how fishnet works overall.

by the time of calling serverrpc, server local values always empty, even it is updated locally on server before serverrpc call.

[hard lintel]

make sure you client is not calling this . server should exist and can get this msg

[Server]
void Changemyvalue(){
list.Add(1);
} 

then you are calling serverRpc from server itself

ServerRpc needs to call from a client

[pastel dagger]

if (!IsServerInitialized) return;

this prevents it right?

[hard lintel]

no

there are two ways

one is using
[Client] from client

another is you can call form may be
public void overrive OnStartClient()
{
}

[pastel dagger]

how do you differentiate inside Update?

[hard lintel]

update will call all the time

but make sure you have a client who is calling from update

do you have a player ?

[pastel dagger]

yes i have

[hard lintel]

then update will work

[pastel dagger]

update function will called on both server and client all the time right?

[hard lintel]

and from where are you calling the [Server] ??

update will call on client only not on server unless [ServerRpc]

[pastel dagger]

i see, i thought if (!IsServerInitialized) return; this differentiate that update call of server and client.

[hard lintel]

no

[pastel dagger]

so there is no Update method on the server?

[hard lintel]

[Server] can be called only if server has the object
[ServerRpc] will be called from client to server.
So Update to ServerRpc is like a update on server

[pastel dagger]

gotcha. trying on my end

[hard lintel]

There is an update method on server.. but its for different purpose . like authoritive movement.. TickUpdate..

You should use it only if you are using rigidbody movement

also update is bad on server.. it will take too much bandwidth.. so its better not to call on everyframe on server

[pastel dagger]

ok, lets say server updates its own value inside tickupdate. how client gets that updated value?

[hard lintel]

its just like normal update.. but inside server.. there is a video on Fishnet official youtube channel to understand it better

[pastel dagger]

sorry, if its obvious, but i'm preparing my mental set for coming project 😄

[hard lintel]

its called Authorative movement

thast great to hear 😄

[pastel dagger]

so that movement, combined with transform component it gets value of the position right?

[hard lintel]

I am also working on my own shooting project

Network transform will only sync the player possition .. but still player can cheat with lets see speed 100 in their local machine.. how can server detect ?

thats when tickupdate needed

[pastel dagger]

sure, there needed some verification before executing.

[hard lintel]

https://www.youtube.com/watch?v=H_KovR7bcn8

so it will roll the player back where it should be

[pastel dagger]

i watched it but haven't get my hands on it yet. need to fundamentally understand it correctly first

[hard lintel]

i think its better not to touch it at first.
first make something with normal Rpc calls and syncvars .
then when everything is almost done then impliment this

[pastel dagger]

yeah thats what i'm trying to do it. while testing those this issue arise

[hard lintel]

ahh i see

server calls can be tricky sometimes

[pastel dagger]

i tested all rpcs and sync var it works ok. but soon i changed syncvar to regular property this comes.

[hard lintel]

ohhh

are you trying to change name or something ?

[pastel dagger]

just tinkering around when i should use syncvar when not

[hard lintel]

its not possible to do it like that

i see

its impossible to set name with that from client

you have to have syncvar

cause it doesnt update fast enough

there is a small bug

from mirror

[pastel dagger]

just trying to server updates its own value, client get that value when needed. without syncvar

[hard lintel]

then you can but need a coroutine or something.. waitforseconds(2) .. because your player do not spawn before you are trying to access the value

[pastel dagger]

thats why i put input triggers there wait for while and hit the trigger

[hard lintel]

ahh haha

anyway is it working ? [Server]

[pastel dagger]

it seems not sadly

[hard lintel]

make a empty Gameobject with networkobject. then add a script to it.. call from there

it will work

or have to use [serverRpc]

[pastel dagger]

is it related to reference types, cause primitive types working

if i put primitive type property it can be read inside serverrpc

[hard lintel]

List<int> myint = 0;
public override void OnStartClient()
{
  ServerChangeMyServerValue();
}
[ServerRpc]
private void ServerChangeMyServerValue(){
myiny +=1;
}

void Update(){
  if (Input.Triggers) {
      ServerGetValue();
  } 
}

[ServerRpc]
private void ServerGetValue(){
debug.log(myint[0]);
}

try this

[pastel dagger]

i don't want to change my value from client

server changing value

[hard lintel]

then you have to call from somewhere else

[pastel dagger]

server changing value on its own. without client

[hard lintel]

wait let me try

[pastel dagger]

i tried on fresh project and it works with list.

[hard lintel]

Well i tried many ways.. but in in update it will not work. but [ServerRpc] is working fine. only changes the value in server not in client

so u need some trigger in update may be

public List<int> myValue = new();

public override void OnStartClient()
{
    base.OnStartClient();
    if(IsOwner)
        StartCoroutine(Delay());
}

private IEnumerator Delay() {
    yield return new WaitForSeconds(3);
    ServerChangeValue();
}   
[ServerRpc]
private void ServerChangeValue() {
    myValue.Add(1);
}

[pastel dagger]

it works on my end. maybe because of server client starts in same editor. let me try with seperate builds.

[hard lintel]

server value has changed but this is very bad practice i would say

you need syncvar for this

[pastel dagger]

in your example you still changes value inside ServerRpc, it should just gets value

[hard lintel]

it should with a trigger

but what is the purpose for this ? i dont think you will use something like this

[pastel dagger]

public class Test : NetworkBehaviour
{
    private float test;
    private List<int> list = new();

    public override void OnStartServer()
    {
        base.OnStartServer();
        test = 10f;
        list.Add(1);
    }

    // Start is called before the first frame update
    public override void OnStartClient()
    {
        base.OnStartClient();
        GetValue();
        GetClientValue();
    }


    [ServerRpc]
    public void GetValue()
    {
        Debug.Log("count on server: " + list.Count + " " + test);
    }

    [Client]
    public void GetClientValue()
    {
        Debug.Log("count on client: " + list.Count + " " + test);
    }
}

there is no purpose just look into how it behaves.

[hard lintel]

ohh

we usually dont use OnStartServer

very rare cases

for getting events

[pastel dagger]

on the example, both debug prints same value. why?

[hard lintel]

my example ?

[pastel dagger]

my example

it should be different right

[hard lintel]

so basically you are first adding 1 to list to client and server both

even when you are using OnStartServer, it is running on the player which is a client

no my mistake

[pastel dagger]

https://fish-networking.gitbook.io/docs/manual/guides/network-behaviour-guides

i'm seeing this

[hard lintel]

it is runnign on server only

[pastel dagger]

yeah

so unless i fully understand those i can't go further properly. its main purpose kk

[hard lintel]

but server may be setting the value before spawning may be.. not sure how it is interacting

see my example

public List<int> myValue = new();

public override void OnStartClient()
{
    base.OnStartClient();
    if(IsOwner)
        StartCoroutine(Delay());
}

private IEnumerator Delay() {
    yield return new WaitForSeconds(3);
    ServerChangeValue();
}   
[ServerRpc]
private void ServerChangeValue() {
    myValue.Add(1);
}

[pastel dagger]

i just create fresh project and attach script got gameobject. which is spawnable prefab

[hard lintel]

this is updating on server only

it will not change on client

but reading from it is another challenge

cause update will throgh error

try my code and build 2 instances

you will see it is updating on server only

[pastel dagger]

can you try my example, its clearly showing that value is changed only on server, but client also prints same.

i'll try with different build

[hard lintel]

ohh

ok wait a sec

your code is working fine

only server printing the value

client is 0 0

which is suppose to happen

[pastel dagger]

mine prints same values. how?

[hard lintel]

build 2 instances

run 1 server 1 client

[pastel dagger]

ah i see. it prints same on editor

[hard lintel]

ofc client is the server there

[pastel dagger]

unless i have 2 editors, can't truly rely on what i code hehe

[hard lintel]

not really. there is a tool

search in Asset Store "IngameDebugConsole"

this will help

[pastel dagger]

nice

[hard lintel]

or if you have good pc you can use parrallel sync

[pastel dagger]

i'm using parrelsync

[hard lintel]

ohh

then it will work 😛

just dont use server and client at the same time

[pastel dagger]

yeah, just some of the parts i'm thinking that first editor is server and client, but it turns out it become client host i guess.

[hard lintel]

it runs little slow on my pc.. so i use that debug console

yes if you run both it will become host and will have the power of server

[pastel dagger]

so need to those flags heavily kk

[hard lintel]

in parrallel sync one can be server another can be client

[pastel dagger]

yeah thats how i testing mostly. so need to blockout that client host features on my code and try again on my original issue kk

[hard lintel]

cool

[pastel dagger]

have you done that client predicted movement?

[hard lintel]

I have tried it but did not use it on my game

using custom character controller

so i am doing it little differntly

more over same thing

[pastel dagger]

i'm about to try it on my end. currently movement happens on server. client moves like glitchy. i thinking that it moves smoothly once i add the prediction

[hard lintel]

cool try it. its little tricky. also try collider rollback

for bullets

there is some examples

[pastel dagger]

sure thing. i wish that documentation be little bit more extensive

[hard lintel]

same here 😛

but only few ppl are contributing mostly 1 on fishnet.. so its hard for them to keep making tutorials while updating fishnet

[pastel dagger]

yeah understand that.

[hard lintel]

There is a lobby project and a Fps land project that can help a lot

lobby project going to be hard to understand for sure

[pastel dagger]

i just get pro yesterday to try out how it deals with network delay etc

[hard lintel]

i made my own lobby .. cause it was so intense it could not fit on my brain

[pastel dagger]

i remember it was pain, when i tried to have proper chat application over the websocket with nodejs.

[hard lintel]

You might need it later

my lobby project

[pastel dagger]

nice man. thanks. it will help definetely

[pastel dagger]

i just wonder, is it proper place to chat like that hehe

[hard lintel]

This is a little template i have although it might have very small bugs

well It is your post. if you need help we can talk about anything regarding help

[pastel dagger]

this is what i'm aiming for. https://blog.winterpixel.com/the-tech-stack-behind-a-wasm-and-webgl2-battle-royale

[hard lintel]

Should be interesting to work on

is it multiplayer or just bots ?

[pastel dagger]

setup everything on backend part. so dealing with unity part.

it is multiplayer

[hard lintel]

Wish you the best of luck for this game

[pastel dagger]

thanks, same to you. thanks for taking your time and supporting me.

[hard lintel]

i would suggest you to start with small templates.. and make templates always so you can use it for further proejcts

while making the game

[pastel dagger]

noted. i'm just starting play around with different engines. So unity reminds me that good old jquery stuff. lots of plugin kk.

[hard lintel]

lol jquery xD

[pastel dagger]

same feeling lol

[hard lintel]

anyway have a great day