neo-go

Go Node and SDK for the NEO blockchain.

Overview

This project is currently in alpha and under active development.

Project Goals

Full port of the original C# NEO project. A complete toolkit for the NEO blockchain, including:

• Full consensus node
• Full RPC node
• RPC client
• CLI tool
• Smart contract compiler

Current State

This project is still under heavy development. Still working on internal API's and project layout. T his should not take longer than 2 weeks.

The project will exist out of the following packages:

Package	State	Developer
api	started	@anthdm
core	started	@anthdm
network	started	@anthdm
vm	started	@anthdm
smartcontract	started	@revett
cli	started	@revett

Getting Started

Server

Install dependencies, this requires dep:

make deps

Build the neo-go CLI:

make build

Currently, there is a minimal subset of the NEO protocol implemented. To start experimenting make sure you a have a private net running on your machine. If you dont, take a look at docker-privnet-with-gas.

Start a NEO node:

./bin/neo-go node -seed 127.0.0.1:20333

You can add multiple seeds if you want:

./bin/neo-go node -seed 127.0.0.1:20333,127.0.01:20334

By default the server will currently run on port 3000, for testing purposes. You can change that by setting the tcp flag:

./bin/neo-go node -seed 127.0.0.1:20333 -tcp 1337

RPC

If you want your node to also serve JSON-RPC, you can do that by setting the following flag:

./bin/neo-go node -rpc 4000

In this case the server will accept and respond JSON-RPC on port 4000. Keep in mind that currently there is only a small subset of the JSON-RPC implemented. Feel free to make a PR with more functionality.

VM

TODO

Smart Contracts

NOTE: At this moment there is only a small subset of the Go language implemented.

Compile a smart contract

./bin/neo-go contract compile -i mycontract.go

By default the filename will be the name of your .go file with the .avm extension, the file will be located in the same directory where you called the command from. If you want another location for your compiled contract:

./bin/neo-go contract compile -i mycontract.go --out /Users/foo/bar/contract.avm

Debugging your smart contract

You can dump the opcodes generated by the compiler with the following command:

./bin/neo-go contract opdump -i mycontract.go

This will result in something like this:

INDEX    OPCODE    DESC
0        0x52      OpPush2
1        0xc5      OpNewArray
2        0x6b      OpToAltStack
3        0x 0      OpPush0
4        0x6c      OpFromAltStack
5        0x76      OpDup
6        0x6b      OpToAltStack
7        0x 0      OpPush0
8        0x52      OpPush2
9        0x7a      OpRoll
10       0xc4      OpSetItem

Contributing

Feel free to contribute to this project after reading the contributing guidelines.

Before starting to work on a certain topic, create an new issue first, describing the feauture/topic you are going to implement.

Contact

• @anthdm on Github
• @anthdm on Twitter
• Send me an email anthony@cityofzion.io

License

• Open-source MIT