fogmoon

pragma solidity ^0.4.25;


// TRC20 contract interface
contract Token {
  function balanceOf(address) public view returns (uint);
}

contract BatchBalance {
  /* Fallback function, don't accept any TRX */

fogmoon

Semantic Commit Messages

See how a minor change to your commit message style can make you a better programmer.

Format: <type>(<scope>): <subject>

<scope> is optional

Example

fogmoon

#element:before {
  content: "";
  position: absolute;
  width: 0;
  height: 0;
  border-left: 16px solid transparent;
  border-right: 16px solid transparent;
  border-bottom: 16px solid #fff;
  top: -15px;
  left: 27px;

fogmoon

#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>

#pragma warning(disable:4996)


/************************************************************************/
/* Zip file struct                                                      */
/*                                                                      */

fogmoon

Eh?

So a FOSS project might have signed releases with a GPG sig. How do you verify it on a Linux machine?

Example sigp/lighthouse, but same idea for any project.

Install gpg: sudo apt install gpg

Grab their PGP key ID from their download page and gpg --keyserver pgp.mit.edu --recv THEIRKEYID and wait

fogmoon

Overview

As of August 2022, a 1TB SSD is getting tight to run an Ethereum node in. The recommendation now is for 2TB of space. I wanted to see what it takes to still fit into 1TB.

EIP-4844 will increase space need by another 200 GiB or so, which may make 1TB setups plain not feasible. This is a 2023 discussion however.

Options

• Geth with offline prune every 2-3 months ... this would be a stop-gap, as offline prune takes the node down, including any validators on it
• Future Geth without prune ... this might work well.

fogmoon

watch "echo stats | nc 127.0.0.1 11211"



accepting_conns		The Memcached server is currently accepting new connections.
auth_cmds		Number of authentication commands processed by the server - if you use authentication within your installation. The default is IP (routing) level security which speeds up the actual Memcached usage by removing the authentication requirement.
auth_errors		Number of failed authentication tries of clients.
bytes			Number of bytes currently used for caching items, this server currently uses ~6 MB of it's maximum allowed (limit_maxbytes) 1 GB cache size.
bytes_read		Total number of bytes received from the network by this server.
bytes_written		Total number of bytes send to the network by this server.

fogmoon

memcache

@see http://l-w-i.net/t/memcached/command_001.txt

1.memcached-tool

dump

$ memcached-tool localhost dump

fogmoon

First of all, please note that token expiration and revoking are two different things.

1. Expiration only happens for web apps, not for native mobile apps, because native apps never expire.
2. Revoking only happens when (1) uses click the logout button on the website or native Apps;(2) users reset their passwords; (3) users revoke their tokens explicitly in the administration panel.

1. How to hadle JWT expiration

A JWT token that never expires is dangerous if the token is stolen then someone can always access the user's data.

Quoted from JWT RFC:

fogmoon

addEventListener('fetch', event => {
  event.respondWith(fetchAndCheckOrigin(event.request))
})

async function fetchAndCheckOrigin(req) {
  try {
    startTime = new Date();
    const body = await req.body;
    const ip = req.headers.get('cf-connecting-ip');
    const es = req.headers.get('cf-ipcountry');