Warchant

Optimizations in iroha:

1. move definitions of non-template classes to cpp files from hpp.

must have

This helps to reduce amount of header dependencies, and compile definitions exactly once. Also this helps to follow ODR (One Definition Rule).

RULE: it is always an error to place definitions with external linkage to .hpp files. (hyperledger-iroha/iroha#787, rule 1)

Warchant

Smart contract analysis

Introduction

A smart contract is a computer protocol intended to facilitate, verify, or enforce the negotiation or performance of a contract. Smart contracts were first proposed by Nick Szabo in 1996 [5].

A smart contract is a set of promises, specified in digital form, including protocols within which the parties perform on these promises, -- Nick Szabo [1].

Good analogy to understand smart contracts better:

Warchant

/**
 * Copyright Soramitsu Co., Ltd. 2017 All Rights Reserved.
 * http://soramitsu.co.jp
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *

Warchant

Proposal for smart contracts in iroha

author: Bohdan Vanieiev

According to the list of commands and queries implemented in iroha current design of commands and queries is not good, because:

1. It lacks low level commands, which allow to build arbitrary programs, required for proper smart contracts implementation. In other words, the system has only high-level commands such as transfer asset, therefore is limited in features.
2. It is hard to extend running system with new commands and queries, because iroha has to be recompiled after addition of new features.
3. It is hard to add new commands or queries to the source code, because addition requires changes in 7+ different parts of iroha.

Other blockchains

Warchant

version: "3"

services:
  sonarqube:
    image: sonarqube
    expose:
      - 9000
    ports:
      - "127.0.0.1:9000:9000"
    networks:

Warchant

#!/bin/sh
if [ -z "$1" ]; then
	echo "Provide 1 argument: name of the client"
	exit 1
fi
name=$1
docker run -v $OVPN_DATA:/etc/openvpn --rm -it kylemanna/openvpn easyrsa build-client-full $name nopass
docker run -v $OVPN_DATA:/etc/openvpn --rm kylemanna/openvpn ovpn_getclient $1 > $1.ovpn

Warchant

################################
#            libuv             #
################################
ExternalProject_Add(libuv_libuv
  GIT_REPOSITORY "https://github.com/libuv/libuv.git"
  CONFIGURE_COMMAND ./autogen.sh && ./configure
  BUILD_IN_SOURCE 1
  BUILD_COMMAND $(MAKE)
  INSTALL_COMMAND "" # remove install step
  TEST_COMMAND "" # remove test step

Warchant

version: '3'

services:
  oracle:
    image: alexeiled/docker-oracle-xe-11g
    container_name: oracle
    hostname: oracle
    dns_search: 188.130.155.34
    privileged: true
    shm_size: 2g

Warchant

import sha3
import hashlib

def h(s):
    return hashlib.sha3_256(s).digest()

# a tree with 4 leafs
d = [0] * (4*2-1)

# store 8 roots for 8 pushes

Warchant

include "key.fbs";
include "primitives.fbs";
include "asset.fbs";

namespace iroha;


table Account {
  pubKey: PublicKey (required);  // primary key for account
  alias:  string;