onggunhao

Deploying React VR

Overall Process

1. npm run bundle on the ReactVR project. It creates a new folder in vr/build. The exported files should be self-sufficient when uploaded to a web server.

2. Copy static_assets folder into the vr/build directory. (Heroku errors on this, which is why it needs the static_asset filenames in the index.html file). We may be able to resolve this by using a remote CDN to host the static_assets, and passing in the assetRoot argument to ReactVR.init. See the ReactVR deployment instructions here.

onggunhao

React VR Learning Resources

https://hashnode.com/post/how-to-make-react-vr-apps-cj2bivllj004r2d53m68z4p1z

https://hackernoon.com/how-i-got-a-react-vr-dev-environment-working-with-an-android-cardboard-1fcaf00faebc

https://blog.pusher.com/building-a-realtime-react-vr-app/

onggunhao

Annotated Blockchain.info Websocket API

This is an annotated version of Blockchain.info's Websocket API with explanations of message contents.

Multiple Inputs and Outputs

Bitcoin transactions (especially if large) may have multiple inputs and outputs in a single transaction. http://chimera.labs.oreilly.com/books/1234000001802/ch02.html explains this very concisely.

Sample Transaction

The JSON object below is the actual message received from the Blockchain.info Websockets API for the transaction 0857b9de1884eec314ecf67c040a2657b8e083e1f95e31d0b5ba3d328841fc7f. You can see the Blockchain.info transaction page for this transaction here.

Transaction Page:

onggunhao

Deploying Bitcoin-VR on Github Pages

Before

0. Read Facebook's React VR deployment guide.
1. Copy the list of static assets files in reactvrinit.js. (TODO: write automated script to handle this)

ReactVR.init(
  // When you're ready to deploy your app, update this line to point to
  // your compiled index.bundle.js
 './index.bundle.js?platform=vr',

onggunhao

049d770fc7924b6b3a23da1a17a6e3fa970e12a6611d719c81bb5460ba5319963697a4886e81e5c527eb243b6672024470e8766cdae4eb7fade5d513b364a774d3

onggunhao

Fixing X11 connection rejected errors

This is written for newcomers to the lab, who often experience X11 connection rejected errors when running gnome-terminal (you need this to run atom, sublime text etc to edit on a remote server).

For more info, read the full answer on StackExchange https://unix.stackexchange.com/questions/412065/ssh-connection-x11-connection-rejected-because-of-wrong-authentication

1. Log onto remote server (Andromeda)

echo $DISPLAY This should display your current X11 display

xauth list If nothing prints on console, it means ssh did not automatically generate the X11 authorization cookies on the local display properly

onggunhao

Overview of the Ethereum Dataset

Hi Sourav,

This is knowledge transfer of lessons I learnt working with Ethereum. I had to figure out a lot of this from scratch, so hopefully this saves you a lot of time.

The current geth node on andromeda is in a local environment so passwords etc will be included in this write-up (see the last page), but please change them as soon as possible for hygiene purposes.

Conceptual overview of dataset

onggunhao

pragma solidity ^0.5.7;

contract PMT {
    using ABDKMath64x64 for uint128;
    
    // rate is in basis points (0.5% = 50)
    function pmt(int128 rate, uint256 numPayments, int128 principal) 
        public 
        returns (int128) 
    {

onggunhao

  {
    "extends": "solhint:recommended",
    "plugins": [],
    "rules": {
      "avoid-throw": false,
      "avoid-suicide": "error",
      "avoid-sha3": "warn"
    }
  }

onggunhao

{
  "extends": ["solhint:recommended"],
  "rules": {
    "prettier/prettier": "error",
    "avoid-throw": false,
    "avoid-suicide": "error",
    "avoid-sha3": "warn"
  },
  "plugins": ["prettier"]
}