neo-go

Go Node and SDK for the NEO blockchain.

Overview

This project aims to be a full port of the original C# NEO project. A complete toolkit for the NEO blockchain, including:

• consensus node
• RPC node & client
• RPC client
• CLI tool
• Smart contract compiler
• NEO virtual machine

Getting started

Installation

Install dependencies.

neo-go uses dep as its dependency manager. After installing deps you can run:

make deps

How to setup a node

Docker

Each tagged build is built to docker hub and the :latest tag pointing at the latest tagged build.

By default the CMD is set to run a node on testnet, so to do this simply run:

 docker run -d --name neo-go -p 20332:20332 -p 20333:20333 cityofzion/neo-go

Which will start a node on testnet and expose the nodes port 20333 and 20332 for the JSON-RPC server.

Building

Build the neo-go CLI:

make build

Quick start a NEO node on the private network. This requires the neo-privatenet Docker image running on your machine.

make run

To run the binary directly:

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

By default the node will run on the private network, to change his:

./bin/neo-go node --mainnet

Available network flags:

• --mainnet, -m
• --privnet, -p
• --testnet, -t

If you want in-depth customization for your node, there are yaml config files for each network available in the config directory. Those files are automatically loaded, corresponding the provided netmode flag.

ProtocolConfiguration:
  Magic: 56753
  AddressVersion: 23
  StandbyValidators:
  - 02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2
  - 02103a7f7dd016558597f7960d27c516a4394fd968b9e65155eb4b013e4040406e
  - 03d90c07df63e690ce77912e10ab51acc944b66860237b608c4f8f8309e71ee699
  - 02a7bc55fe8684e0119768d104ba30795bdcc86619e864add26156723ed185cd62
  SeedList:
  - 127.0.0.1:20333
  - 127.0.0.1:20334
  - 127.0.0.1:20335
  - 127.0.0.1:20336
  SystemFee:
    EnrollmentTransaction: 1000
    IssueTransaction: 500
    PublishTransaction: 500
    RegisterTransaction: 10000

ApplicationConfiguration:
  DataDirectoryPath: "./chains/privnet"
  RPCPort: 20332
  NodePort: 20333
  Relay: true
  DialTimeout: 3
  ProtoTickInterval: 2
  MaxPeers: 50

Writing smart contracts in Go

In depth documentation about the neo-go compiler and smart contract examples can be found inside the compiler package.

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 inspect -i mycontract.go

This will result in something like this:

INDEX    OPCODE    DESC
0        0x54      PUSH4
1        0xc5      NEWARRAY
2        0x6b      TOALTSTACK
3        0x5a      PUSH10
4        0x6a      DUPFROMALTSTACK
5        0x0       PUSH0
6        0x52      PUSH2
7        0x7a      ROLL
8        0xc4      SETITEM
9        0x6a      DUPFROMALTSTACK
10       0x0       PUSH0
11       0xc3      PICKITEM
12       0x5a      PUSH10
13       0xa2      GTE
14       0x64      JMPIFNOT
15       0x7       7
15       0x0       0
17       0x51      PUSH1
18       0x6c      FROMALTSTACK
19       0x75      DROP
20       0x66      RET
21       0x0       PUSH0
22       0x6c      FROMALTSTACK
23       0x75      DROP
24       0x66      RET

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 feature/topic you are going to implement.

Contact

• @anthdm on Github
• @anthdm on Twitter
• Reach out to me on the NEO Discord channel
• Send me an email anthony@cityofzion.io

License

• Open-source MIT