vkobel’s gists

vkobel / EcRecover.sol

Created July 6, 2017 13:40

Ethereum Solidity - example contract that shows how to use the ecrecover function to works along with eth_sign

	pragma solidity ^0.4.11;

	contract EcRecover {

	function verify(bytes32 hash, uint8 v, bytes32 r, bytes32 s) returns (address) {
	bytes32 prefixedHash = sha3("\x19Ethereum Signed Message:\n32", hash);
	return ecrecover(prefixedHash, v, r, s);
	}

	}

vkobel / gist:3c3b8b5f23dced28e86faad4f4da23e7

Created May 15, 2017 13:02

Rinkeby address

0xbb14b3d84229e9702fdd0a73056f0bd19236873d

vkobel / async_http_get.py

Last active May 5, 2017 07:58

Async http get using aiohttp

	import aiohttp
	import asyncio

	def async_http_get(urls, extractor=None, json_response=True):
	tasks = []
	sem = asyncio.Semaphore(32)

	async def fetch(session, url):
	async with session.get(url) as response:
	if json_response:

vkobel / hexKeyToPem.sh

Last active April 19, 2017 13:32

Convert hex public key (ECDSA, secp256k1) to pem format

	#!/bin/bash
	readonly ASN1_PREFIX='3056301006072a8648ce3d020106052b8104000a03420004'

	if [ -z "$1" ]
	then
	echo "Hex key should be supplied as first argument!"
	exit 1
	fi

	key=$ASN1_PREFIX$1

vkobel / chunk-process.go

Last active March 13, 2017 15:41

Separate an array into chunks and process them asynchronously. Then returns the results using go channels

	package main

	import (
	"fmt"
	"time"
	)

	const processes int = 4

	func Chunkate(data []int, fn func([]int, chan int)) []int {

vkobel / .Xresources

Last active February 23, 2017 07:42

Solarized theme for URxvt

	! Appearance
	URxvt*font: xft:terminus:size=10:antialias=true
	URxvt*cursorColor: #DCDCCC

	! General
	URxvt*scrollBar: false
	URxvt*secondaryScroll: true
	URxvt*saveLines: 65535
	URxvt*cursorBlink: true
	URxvt*urgentOnBell: true

vkobel / KobyShop.sol

Last active December 23, 2016 09:33

Simple Ethereum contract to act as a shop

vkobel / queryWall.js

Last active November 24, 2016 08:30

Ethereum simple contract storage using logs (events) and query it

	var newWall = eth.contract([{"constant":false,"inputs":[{"name":"message","type":"string"}],"name":"publish","outputs":[],"payable":false,"type":"function"},{"payable":false,"type":"fallback"},{"anonymous":false,"inputs":[{"indexed":false,"name":"message","type":"string"},{"indexed":false,"name":"addr","type":"address"}],"name":"LogMessage","type":"event"}]).at("0xfFf537A2E812B0Cd738bf913a476FE45Bd5484bE");

	var msgEvt = newWall.LogMessage({}, {fromBlock: 0, toBlock: 'latest'});

	function getLogs(){
	msgEvt.get(function(err, logs){
	for(var k in logs){
	console.log(logs[k].args.message);
	}
	})

vkobel / uniq_tok_per_client.sh

Created September 20, 2016 16:02

	cat $1 \| egrep "/search-results.*/" \|
	sed -n 's/.id=$.\{6\}$.client=$[^{ ,"}]$./\1 \2/p' \|
	sort -u -k1,1 \| sort -k2,2 \| uniq -f 1 -c \| awk '{ print $3 ";" $1 }'

vkobel / group_logs.sh

Created September 14, 2016 08:33

	#!/bin/bash

	# filter on 2 colums (id=... and datetime) then sort and uniq by the first col only (id) the sort by datetime
	cat /var/log/nginx/access.log \| sed -n 's/.\[$.\+$\].id=$.\{6\}$.*/\2 -> \1/p' \| sort -u -k1,1 \| sort -k3

	# output would look like:
	# d77ea4 -> 13/Sep/2016:07:17:36 +0200
	# 11ff21 -> 13/Sep/2016:07:45:10 +0200
	# 628bf5 -> 13/Sep/2016:07:52:09 +0200
	# 9d8a4c -> 13/Sep/2016:07:56:53 +0200

	cat $1 \| egrep "/search-results.*/" \|
	sed -n 's/.id=\(.\{6\}\).client=\([^{ ,"}]\)./\1 \2/p' \|
	sort -u -k1,1 \| sort -k2,2 \| uniq -f 1 -c \| awk '{ print $3 ";" $1 }'

Vincent Kobel vkobel