Using newer compiler versions and the optimizer gives gas optimizations and additional safety checks for free!
The advantages of versions 0.8.* over <0.8.0 are:
0.8.0 (can be more gas efficient than some
library based safemath).0.8.2, leads to cheaper runtime gas.
Especially relevant when the contract has small functions. For
| import timeit | |
| import threading | |
| import asyncio | |
| import contextlib | |
| import requests | |
| from aiohttp import ClientSession | |
| from web3.providers.base import JSONBaseProvider | |
| from web3.providers import HTTPProvider |
Note: PBSS in Geth >=1.13.0 removes the need to prune manually.
Geth (Go-Ethereum) as of July 2022 takes about 650 GiB of space on a fast/snap sync, and then grows by ~ 14 GiB/week with default cache, ~ 8 GiB/week with more cache.
| pragma solidity ^0.7.0; | |
| // Each mining pool that intends to provide flash loans deploys a Loaner contract and transfers ETH to it | |
| // When testing each bundle, the diff in balance in this contract is taking into account for calculating effective gas price | |
| // The contract loans funds only on blocks mined by the miner and on zero-gasprice txs | |
| contract Loaner { | |
| address immutable owner; | |
| constructor(address _owner) { | |
| owner = _owner; |
| use std::{ | |
| fs::File, | |
| io::{Read, Write}, | |
| time::Instant, | |
| }; | |
| use tokio::task::{self, JoinHandle}; | |
| async fn compute() { | |
| let handles: Vec<JoinHandle<_>> = (0..1000) | |
| .map(|_| { |
| // RLP encoded transaction | |
| const rawTxHex = '0xed8205fc843b9aca00825208944592d8f8d7b001e72cb26a73e4fa1806a51ac79d88016345785d8a000080808080' | |
| // using rlp package to decode values | |
| const rlp = require('rlp') | |
| const decoded = rlp.decode(rawTxHex) | |
| console.log(decoded) | |
| /* | |
| [ <Buffer 05 fc>, | |
| <Buffer 3b 9a ca 00>, |
Get the value of COMP earned for an address that uses the Compound protocol. This can be done using the Lens contract with JSON RPC or another Smart Contract. If you do an eth_call with JSON RPC, it is free (no gas costs).
getCompBalanceMetadataExt method in the Lens contract
https://etherscan.io/address/0xdCbDb7306c6Ff46f77B349188dC18cEd9DF30299#code
| # login to devop machine | |
| ssh ec2-user@devop.hmny.io | |
| # build the static binary | |
| cd /home/ec2-user/go/src/github.com/harmony-one/harmony | |
| ./scripts/go_executable_build.sh -s | |
| # set environment variable | |
| . ~/bin/dry.profile |
let's say my BLS key is in my current directory and its called
