Tomek Drwięga tomusdrw

Introduction

To show Parity what you are capable of, we have put together a couple of short open-ended tasks. Depending on your areas of personal interest, you can pick any of the available items.

We generally don't force down bullet-point requirements in our day-to-day tasks, and these items are no different - it is up to you to handle the task in the way you best deem fit.

Most importantly - have some fun.

Available Tasks

Try to break transaction scheduler

~~Last one thing is not yet implemented - transactions should be allowed only for certified accounts. (so right now it's possible to spam the service by sending transactions from newly created accounts)~~

https://txsched.parity.io/ -> Mainnet
https://txsched-kovan.parity.io/ -> Kovan

How to do it?

Parity RPC methods

Groupped by cause of change of returned value.

Can update with new block:

eth_blockNumber
eth_getBalance(acc, bn)
eth_getStorageAt(acc, idx, bn)
eth_getBlockByNumber(bn, includeTx)

Servers summary:

Port: 8545

RPC server & Dapps server

RPC exposed as POST request to any path (except for /api/*)
Validates Host headers and returns proper CORS headers (doesn't process request if CORS is invalid)
When Dapps enabled, additionally: a) Serves network and builtin dapps b) Exposes /api/ and /parity-utils


	// Trait for functions will allow some nice meta programming.
	type EthabiFunction {
	type Output = T;

	fn encoded(&self) -> ethabi::Bytes;

	fn output(&self, ethabi::Bytes) -> Result<Self::Output>;
	}

	// Copyright 2015-2017 harity Technologies (UK) Ltd.
	// This file is part of Parity.

	// Parity is free software: you can redistribute it and/or modify
	// it under the terms of the GNU General Public License as published by
	// the Free Software Foundation, either version 3 of the License, or
	// (at your option) any later version.

	// Parity is distributed in the hope that it will be useful,
	// but WITHOUT ANY WARRANTY; without even the implied warranty of

	Loading config file from /home/tomusdrw/.local/share/io.parity.ethereum/config.toml
	2017-09-11 17:01:41 main INFO parity::run Starting Parity/v1.7.2-unstable-3b10e0b-20170830/x86_64-linux-gnu/rustc1.21.0-beta.2
	2017-09-11 17:01:41 main INFO parity::run Keys path /home/tomusdrw/.local/share/io.parity.ethereum/keys/Foundation
	2017-09-11 17:01:41 main INFO parity::run DB path /share/__db/ethereum/db/906a34e69aec8c0d
	2017-09-11 17:01:41 main INFO parity::run Path to dapps /home/tomusdrw/.local/share/io.parity.ethereum/dapps
	2017-09-11 17:01:41 main INFO parity::run State DB configuration: fast
	2017-09-11 17:01:41 main INFO parity::run Operating mode: passive
	2017-09-11 17:01:41 main INFO ethcore::service Configured for Foundation using Ethash engine
	2017-09-11 17:01:42 IO Worker #0 INFO network Public node URL: enode://aab61610f7040ffa00fe1af5e243f4a3422dcf479be3a12f8477e778e84b5745d704fdfa7440321884c29b679e9631a978e9ed36d5c52b0d215f6d299c762e68@192.168.0.100:30303
	2017-09-11 17:01:42 main WARN d

	$ ./target/release/parity --chain=foundatiodb-path /share/__db
	Loading config file from /home/tomusdrw/.local/share/io.parity.ethereum/config.toml
	2017-09-11 16:10:56 main INFO parity::run Starting Parity/v1.7.2-unstable-3b10e0b-20170830/x86_64-linux-gnu/rustc1.21.0-beta.2
	2017-09-11 16:10:56 main INFO parity::run Keys path /home/tomusdrw/.local/share/io.parity.ethereum/keys/Foundation
	2017-09-11 16:10:56 main INFO parity::run DB path /share/__db/ethereum/db/906a34e69aec8c0d
	2017-09-11 16:10:56 main INFO parity::run Path to dapps /home/tomusdrw/.local/share/io.parity.ethereum/dapps
	2017-09-11 16:10:56 main INFO parity::run State DB configuration: fast
	2017-09-11 16:10:56 main INFO parity::run Operating mode: passive
	2017-09-11 16:10:56 main INFO ethcore::service Configured for Foundation using Ethash engine
	2017-09-11 16:10:57 IO Worker #0 INFO network Public node URL: enode://aab61610f7040ffa00fe1af5e243f4a3422dcf479be3a12f8477e778e84b5745d704fdfa7440321884c29b679e9631a978e9ed36d5c52b0d215f6d

	Nodejs:
	'use strict';

	const Hapi = require('hapi');

	// Create a server with a host and port
	const server = new Hapi.Server();
	server.connection({
	host: 'localhost',
	port: 3002

	2017-05-18 11:20:37 WARN signer Blocked connection to Signer API from untrusted origin: Some([99, 104, 114, 111, 109, 101, 45, 101, 120, 116, 101, 110, 115, 105, 111, 110, 58, 47, 47, 110, 103, 98, 106, 103, 108, 112, 101, 104, 99, 102, 110, 112, 107, 111, 98, 101, 112, 109, 112, 103, 105, 111, 99, 108, 97, 106, 108, 107, 107, 108, 103])
	2017-05-18 11:20:47 WARN signer Blocked connection to Signer API from untrusted origin: Some([99, 104, 114, 111, 109, 101, 45, 101, 120, 116, 101, 110, 115, 105, 111, 110, 58, 47, 47, 110, 103, 98, 106, 103, 108, 112, 101, 104, 99, 102, 110, 112, 107, 111, 98, 101, 112, 109, 112, 103, 105, 111, 99, 108, 97, 106, 108, 107, 107, 108, 103])
	2017-05-18 11:20:55 WARN signer Blocked connection to Signer API from untrusted origin: Some([99, 104, 114, 111, 109, 101, 45, 101, 120, 116, 101, 110, 115, 105, 111, 110, 58, 47, 47, 110, 103, 98, 106, 103, 108, 112, 101, 104, 99, 102, 110, 112, 107, 111, 98, 101, 112, 109, 112, 103, 105, 111, 99, 108, 97, 106, 108, 107, 107, 108, 1