holiman

Writing an EVM-debugger for Geth

This document provides some ideas on how someone fairly easily could build the basic blocks for a debugger using geth.

Integration

The tracer interface defines four methods that a 'tracer' needs to implement:

izqui

contract AccountProxy {
    event Fwded(address indexed to, uint256 value, bytes calldata, bool succeeded);
    
    // must be implemented by super contract
    function canFwd(address who, address to, uint256 value, bytes calldata) public view returns (bool);    
    
    function () payable {} // allow to deposit eth
    
    function fwd(address to, uint256 value, bytes calldata) external {
        require(canFwd(msg.sender, to, value, calldata));

chriseth

Answers to Deep Questions about Solidity

The following list of questions was taken from https://www.reddit.com/r/ethereum/comments/72reba/do_you_have_deep_questions_about_solidity_or_the/

An updated summary on the different ways one could have two contracts interact (DELEGATECALL, STATICCALL, libraries, all that stuff) with clear pros/cons for each (gas cost, whether it requires EVM assembly directives, etc)

Question by /u/drcode

I won't talk about low-level opcodes here because of the brevity of the answer. In general, there are four ways functions can be called in Solidity:

AdamISZ

Explanation of how using Schnorr signatures, we can achieve an atomic swap of the "scriptless script" style.

This is based on Poelstra's ideas as summarised in https://download.wpsoftware.net/bitcoin/wizardry/mw-slides/2017-05-milan-meetup/slides.pdf ; also see the earlier outline in https://lists.launchpad.net/mimblewimble/msg00086.html.

Note that the details here are just my thoughts, so if you come to this randomly, don't take it as some kind of well established protocol!

Preliminaries:

We'll use || for concatenation and capitals for elliptic curve points and lower case letters for scalars.

walm

package main

import (
	"fmt"
	"log"
	"strconv"

	"github.com/miekg/dns"
)

chriseidhof

//  Created by Chris Eidhof on 04-01-16.
//  Copyright © 2016 Chris Eidhof. All rights reserved.
//
// Large parts copy/pasted from https://github.com/Eonil/TCPIPSocket.Swift

import Foundation

struct TCPIPSocketAddress {
    init(_ a:UInt8, _ b:UInt8, _ c:UInt8, _ d:UInt8) {
        let	a1	=	UInt32(a) << 24

dominicthomas

ffmpeg -i inputfile.wav -ab 320k outputfile.mp3

pzurek

Twelve Go Best Practices

Francesc Campoy Flores Gopher at Google @francesc http://campoy.cat/+

http://golang.org

• Best practices

macintux

• https://ferd.ca/a-distributed-systems-reading-list.html
• http://the-paper-trail.org/blog/distributed-systems-theory-for-the-distributed-systems-engineer/
• https://github.com/palvaro/CMPS290S-Winter16/blob/master/readings.md
• http://muratbuffalo.blogspot.com/2015/12/my-distributed-systems-seminars-reading.html
• http://christophermeiklejohn.com/distributed/systems/2013/07/12/readings-in-distributed-systems.html
• http://michaelrbernste.in/2013/11/06/distributed-systems-archaeology-works-cited.html
• http://rxin.github.io/db-readings/
• http://research.microsoft.com/en-us/um/people/lamport/pubs/pubs.html
• http://pdos.csail.mit.edu/dsrg/papers/
• http://scalingsystems.com/2011/09/07/reading-list-for-distributed-systems/

IanVaughan

Push branch from one remote into another

Add remote2 as a remote

$ git remote -v
remote2 git@github.com:repo2.git (fetch)
remote2 git@github.com:repo2.git (push)
origin  git@github.com:repo.git (fetch)
origin  git@github.com:repo.git (push)