# NEO-GO client

The Neo-Go client is used to run node, create/compile/deploy/invoke/debug smart contracts, run vm and operate with the wallet. 

## Running node

To start Neo Go node locally it's required to run 
[neo-privatenet](https://hub.docker.com/r/cityofzion/neo-privatenet/) Docker image on your machine.

To run node you can use
```
make run
```

or run the binary directly:

```
./bin/neo-go node
```

By default the node will run on the `private network`, to change this use additional network flag:

```
./bin/neo-go node --mainnet
```

#### Available network flags
- `--mainnet, -m`
- `--privnet, -p`
- `--testnet, -t`

#### Configuration path

If you want to use some specific configuration path you have to use `--config-path` flag

`./bin/neo-go node --config-path /user/yourConfigPath`

## Configuration

All config files are located in `./config` and they are differentiated according to the network type:
- `protocol.mainnet.yml` belongs to `--mainnet` network mode
- `protocol.privnet.yml` belongs to `--privnet` network mode and used be default
- `protocol.testnet.yml` belongs to `--testnet` network mode
- `protocol.unit_testnet.yml` used by unit tests

Those files are automatically loaded, corresponding the provided `netmode` flag.
Example of such configuration:
```yaml
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

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

There is a debug mode available by additional flag: `--debug, -d`

## Smart contract create/compile/deploy/invoke/debug

### Create

In order to create new smart contract:
`./bin/neo-go contract init -n TestContract` 

where 
`init` used to initialize new contract and `--name, -n` - to specify contract name.

It will run wizard with a few questions:
```
Author: TestAuthor
Email: test@gmail.com
Version: 1
Project name: Test
Description: desc
Successfully initialized smart contract [TestContract]
```

After that you will have a package with `TestContract` name and it will include
- `main.go` smart contract file
- `neo-go.yml` project section containing information about the contact

In case you don't want to provide details use `--skip-details, -skip`.

### Compile

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

By default the output 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
```

### Deploy
//Not implemented yet

### Invoke
//Implemented in test mode. It means that it won't affect the blockchain

```
./bin/neo-go contract testinvoke -i mycontract.avm
```

### Debug
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
```

In depth documentation about the **neo-go** compiler and smart contract examples can be found inside 
the [compiler package](pkg/compiler).

## VM run
To run VM use

```
./bin/neo-go vm
```

For the detailed help use `help` in VM console.
There is a small subset of commands:

- `loadgo` -- loads smart contract `NEO-GO-VM > loadgo TestContract/main.go`
- `ops` -- show the opcodes of currently loaded contract
- `run` -- executes currently loaded contract

## Wallet operations

- `./bin/neo-go wallet init -p newWallet` to create new wallet in the path `newWallet`
- `./bin/neo-go wallet dump -p newWallet` to open created wallet in the path `newWallet`
- `./bin/neo-go wallet init -p newWallet -a` to create new account