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https://github.com/Aphoh/go-substrate-gen

https://github.com/Aphoh/go-substrate-gen
https://github.com/Aphoh/go-substrate-gen

golang substrate

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https://github.com/Aphoh/go-substrate-gen

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# Go Substrate Code Generator



A tool that generates boilerplate code for substrate-based chains (calls, storage access, events, etc) using [`go-substrate-rpc-client`](github.com/centrifuge/go-substrate-rpc-client).



This uses the metadata Json RPC provided by substrate-based chains, which you can get by doing:

```

curl -L -X POST -H "Content-Type: application/json" -d '{"id":1, "jsonrpc":"2.0", "method": "state_getMetadata"}' https://rpc.polkadot.io > polkadot-meta.json

```

Just replace `rpc.polkadot.io` with your own server.

### Installation

Clone the repo, run `go install ./...` and make sure it's on your path.



### Using `go generate`



Make a submodule in your go project. Place a `metadata.json` and the following `mymodule.go` file in it

```

//go:generate go-substrate-gen metadata.json "github.com/my/package/mymodule"



package mymodule

```



Then run `go generate ./...` and it'll generate code for each pallet in the `mymodule` directory.



### Calling manually

```

go-substrate-gen meta.json "github.com/my/package/submodule/for/code" 

```



### Getting Metadata

There is code included under `json-gen` to fetch a human-readable version of the json from a locally running substrate node in dev mode.

View [the readme](json-gen/README.md) for instructions.



### Architecture and Design

Please read the [documentation](doc/architecture.md), which describes the received metadata's structure, and also gives an overview of the code's structure.



### Calling code

Example for `pallet_balances`



```golang

// Transfer some liquid free balance to another account.

//

// `transfer` will set the `FreeBalance` of the sender and receiver.

// If the sender's account is below the existential deposit as a result

// of the transfer, the account will be reaped.

//

// The dispatch origin for this call must be `Signed` by the transactor.

//

// # 

// - Dependent on arguments but not critical, given proper implementations for input config

//   types. See related functions below.

// - It contains a limited number of reads and writes internally and no complex

//   computation.

//

// Related functions:

//

//   - `ensure_can_withdraw` is always called internally but has a bounded complexity.

//   - Transferring balances to accounts that did not exist before will cause

//     `T::OnNewAccount::on_new_account` to be called.

//   - Removing enough funds from an account will trigger `T::DustRemoval::on_unbalanced`.

//   - `transfer_keep_alive` works the same way as `transfer`, but has an additional check

//     that the transfer will not kill the origin account.

// ---------------------------------

// - Origin account is already in memory, so no DB operations for them.

// # 

func MakeTransferCall(dest0 *MultiAddress, value1 *types.UCompact) (types.Call, error) {...}

...

```



### Storage code



```golang

// Make a storage key for Account

//  The Balances pallet example of storing the balance of an account.

//

//  # Example

//

//  

//   impl pallet_balances::Config for Runtime {

//     type AccountStore = StorageMapShim, frame_system::Provider, AccountId, Self::AccountData>

//   }

//  

//

//  You can also store the balance of an account in the `System` pallet.

//

//  # Example

//

//  ```nocompile

//   impl pallet_balances::Config for Runtime {

//    type AccountStore = System

//   }

//  ```

//

//  But this comes with tradeoffs, storing account balances in the system pallet stores

//  `frame_system` data alongside the account data contrary to storing account balances in the

//  `Balances` pallet, which uses a `StorageMap` to store balances data only.

//  NOTE: This is only used in the case that this pallet is used to store balances.

func MakeAccountStorageKey(byteArray0 [32]byte) (types.StorageKey, error) {...}



func GetAccount(state *state.State, bhash types.Hash, byteArray0 [32]byte) (ret AccountData, err error) {...}

...

```



### Types



```golang

// Generated pallet_balances_AccountData

type AccountData struct {

	// Field 0 with TypeId=6

	Free types.U128

	// Field 1 with TypeId=6

	Reserved types.U128

	// Field 2 with TypeId=6

	MiscFrozen types.U128

	// Field 3 with TypeId=6

	FeeFrozen types.U128

}



// Generated SpRuntimeMultiaddressMultiAddress with id=188

type MultiAddress struct {

	IsId              bool

	AsIdField0        [32]byte

	IsIndex           bool

	AsIndexField0     struct{}

	IsRaw             bool

	AsRawField0       []byte

	IsAddress32       bool

	AsAddress32Field0 [32]byte

	IsAddress20       bool

	AsAddress20Field0 [20]byte

}



func (ty MultiAddress) Encode(encoder scale.Encoder) (err error) {...}



func (ty *MultiAddress) Decode(decoder scale.Decoder) (err error) {...}

```