RJ

# To run with pyusb debugging:
#
#   PYUSB_DEBUG=debug python relay.py
#
# Grab the vendor and product codes from syslog when plugging in the relay:
#
#   usb 3-1: New USB device found, idVendor=1a86, idProduct=7523
#
import time
import usb.core

RJ

Testing with varying levels of lag per Renet client

I want to run multiple clients locally, each with different amounts of lag.

Achieved by specifying the client's local port number when binding socket, and setting up a pf rule based on local port. (all connecting to renet's default port of 5000)

This is for Mac OS, but something similar would be possible on linux.

#!/bin/bash -ex

RJ

use bevy::{prelude::*, ecs::schedule::SystemSetConfig};
use bevy::ecs::schedule::BoxedSystemSet;
//// game:

#[derive(SystemSet, Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub enum MySets {
    GameLogic,
}

#[derive(Resource)]

RJ

How to provision VMWare compatible .ova images on EC2

EC2 only lets you export instances as VMWare-compatible OVA files if you originally imported that instance from an OVA. Presumably it preserves the metadata and XML gubbins for the instance, and just wraps it up again using that metadata on export.

In order to provision arbitrary VMs in an OVA-exportable way, we abuse the volume snapshots on one VM.

Prep work:

• Make a fresh install of ubuntu server or whatever your base distro is, in VMWare, export as OVA file. (single disk only!)
• Untar the OVA and import the VMDK file into ec2 using ec2-instance-import onto an HVM instance type (ie, no xen kernel needed)

RJ

[package]
name = "bevylog"
version = "0.1.0"
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
bevy = "0.5"

RJ

pub trait AddSpawnSystem {
    fn add_spawning_system(&mut self, system: impl Into<SystemDescriptor>) -> &mut AppBuilder;
}

impl AddSpawnSystem for AppBuilder {
    fn add_spawning_system(&mut self, system: impl Into<SystemDescriptor>) -> &mut AppBuilder {
        self.app.schedule.stage(stage::MAIN_SCHEDULE, |main_schedule: &mut Schedule| {
            main_schedule.stage(stage::SIMULATION_SCHEDULE, |sim_schedule: &mut Schedule| {
                sim_schedule.add_system_to_stage(Stages::SpawningStage, system)
            })

RJ

#!/usr/bin/env python
import socket
import sys

## ipv6.google.com:
PING_TARGET = '2604:8300:100:200b:6667:3:0:4d1f'

source_ip = sys.argv[1]
addresses = [addr for addr in socket.getaddrinfo(source_ip, None) if socket.AF_INET6 == addr[0]]
src_address = addresses[0][-1][0]

RJ

APPDIRS := $(wildcard apps/*)

## Example hack to filter one out: 
## APPDIRS := $(filter-out apps/fooapp, $(APPDIRS))

define PROXY_TARGET
$(1):
  $(foreach appdir,$(APPDIRS),$(MAKE) -C $(appdir) $(1) ;)
endef

RJ

#!/bin/bash
# Install fake erlang packages, then the ESL package
# Afterwards, installing packages that depend on erlang, like rabbitmq,
# will use the ESL packaged erlang without installing the older disto ones
#
apt-get install equivs
# Create fake erlang packages, since we are using esl-erlang instead
cd /tmp
apt-get install -y equivs

RJ

node.default['java']['install_flavor'] = 'oracle' # ugh
node.default['java']['jdk_version'] = '7'
node.default['java']['accept_license_agreement'] = true
node.default['java']['oracle']['accept_oracle_download_terms'] = true

## Mission: install oracle's java, because cassandra prefers it.
##
## Problem: esl-erlang depends on "default-jre-headless" (openjdk)
##          but that conflicts with oracle's java packages, so we can't
##          just remove openjdk, as it takes esl-erlang with it.