README
¶
Cross Subnet Virtual Machine (XSVM)
Cross Subnet Asset Transfers README Overview
Avalanche Subnets and Custom VMs
Avalanche is a network composed of multiple sub-networks (called subnets) that each contain any number of blockchains. Each blockchain is an instance of a Virtual Machine (VM), much like an object in an object-oriented language is an instance of a class. That is, the VM defines the behavior of the blockchain where it is instantiated. For example, Coreth (EVM) is a VM that is instantiated by the C-Chain. Likewise, one could deploy another instance of the EVM as their own blockchain (to take this to its logical conclusion).
Introduction
Just as Coreth powers the C-Chain, XSVM can be used to power its own blockchain in an Avalanche Subnet. Instead of providing a place to execute Solidity smart contracts, however, XSVM enables asset transfers for assets originating on its own chain or other XSVM chains on other subnets.
How it Works
XSVM utilizes AvalancheGo's teleporter package to create and authenticate Subnet Messages.
Transfer
If you want to send an asset to someone, you can use a tx.Transfer to send to any address.
Export
If you want to send this chain's native asset to a different subnet, you can use a tx.Export to send to any address on a destination chain. You may also use a tx.Export to return the destination chain's native asset.
Import
To receive assets from another chain's tx.Export, you must issue a tx.Import. Note that, similarly to a bridge, the security of the other chain's native asset is tied to the other chain. The security of all other assets on this chain are unrelated to the other chain.
Fees
Currently there are no fees enforced in the XSVM.
xsvm
Install
git clone https://github.com/ava-labs/avalanchego.git;
cd avalanchego;
go install -v ./vms/example/xsvm/cmd/xsvm;
Usage
Runs an XSVM plugin
Usage:
xsvm [flags]
xsvm [command]
Available Commands:
account Displays the state of the requested account
chain Manages XS chains
completion Generate the autocompletion script for the specified shell
help Help about any command
issue Issues transactions
version Prints out the version
Flags:
-h, --help help for xsvm
Use "xsvm [command] --help" for more information about a command.
Golang SDK
// Client defines xsvm client operations.
type Client interface {
Network(
ctx context.Context,
options ...rpc.Option,
) (uint32, ids.ID, ids.ID, error)
Genesis(
ctx context.Context,
options ...rpc.Option,
) (*genesis.Genesis, error)
Nonce(
ctx context.Context,
address ids.ShortID,
options ...rpc.Option,
) (uint64, error)
Balance(
ctx context.Context,
address ids.ShortID,
assetID ids.ID,
options ...rpc.Option,
) (uint64, error)
Loan(
ctx context.Context,
chainID ids.ID,
options ...rpc.Option,
) (uint64, error)
IssueTx(
ctx context.Context,
tx *tx.Tx,
options ...rpc.Option,
) (ids.ID, error)
LastAccepted(
ctx context.Context,
options ...rpc.Option,
) (ids.ID, *block.Stateless, error)
Block(
ctx context.Context,
blkID ids.ID,
options ...rpc.Option,
(*block.Stateless, error)
Message(
ctx context.Context,
txID ids.ID,
options ...rpc.Option,
) (*teleporter.UnsignedMessage, []byte, error)
}
Public Endpoints
xsvm.network
<<< POST
{
"jsonrpc": "2.0",
"method": "xsvm.network",
"params":{},
"id": 1
}
>>> {"networkID":<uint32>, "subnetID":<ID>, "chainID":<ID>}
For example:
curl --location --request POST 'http://34.235.54.228:9650/ext/bc/28iioW2fYMBnKv24VG5nw9ifY2PsFuwuhxhyzxZB5MmxDd3rnT' \
--header 'Content-Type: application/json' \
--data-raw '{
"jsonrpc": "2.0",
"method": "xsvm.network",
"params":{},
"id": 1
}'
{"jsonrpc":"2.0","result":{"networkID":1000000,"subnetID":"2gToFoYXURMQ6y4ZApFuRZN1HurGcDkwmtvkcMHNHcYarvsJN1","chainID":"28iioW2fYMBnKv24VG5nw9ifY2PsFuwuhxhyzxZB5MmxDd3rnT"},"id":1}
xsvm.genesis
<<< POST
{
"jsonrpc": "2.0",
"method": "xsvm.genesis",
"params":{},
"id": 1
}
>>> {"genesis":<genesis file>}
xsvm.nonce
<<< POST
{
"jsonrpc": "2.0",
"method": "xsvm.nonce",
"params":{
"address":<cb58 encoded>
},
"id": 1
}
>>> {"nonce":<uint64>}
xsvm.balance
<<< POST
{
"jsonrpc": "2.0",
"method": "xsvm.balance",
"params":{
"address":<cb58 encoded>,
"assetID":<cb58 encoded>
},
"id": 1
}
>>> {"balance":<uint64>}
xsvm.loan
<<< POST
{
"jsonrpc": "2.0",
"method": "xsvm.loan",
"params":{
"chainID":<cb58 encoded>
},
"id": 1
}
>>> {"amount":<uint64>}
xsvm.issueTx
<<< POST
{
"jsonrpc": "2.0",
"method": "xsvm.issueTx",
"params":{
"tx":<bytes>
},
"id": 1
}
>>> {"txID":<cb58 encoded>}
xsvm.lastAccepted
<<< POST
{
"jsonrpc": "2.0",
"method": "xsvm.lastAccepted",
"params":{},
"id": 1
}
>>> {"blockID":<cb58 encoded>, "block":<json>}
xsvm.block
<<< POST
{
"jsonrpc": "2.0",
"method": "xsvm.block",
"params":{
"blockID":<cb58 encoded>
},
"id": 1
}
>>> {"block":<json>}
xsvm.message
<<< POST
{
"jsonrpc": "2.0",
"method": "xsvm.message",
"params":{
"txID":<cb58 encoded>
},
"id": 1
}
>>> {"message":<json>, "signature":<bytes>}
Running the VM
To build the VM, run ./scripts/build_xsvm.sh.
Deploying Your Own Network
Anyone can deploy their own instance of the XSVM as a subnet on Avalanche. All you need to do is compile it, create a genesis, and send a few txs to the P-Chain.
You can do this by following the subnet tutorial or by using the subnet-cli.
Cross Subnet Transaction Example
The following example shows how to interact with the XSVM to send and receive native assets across subnets.
Overview of Steps
- Create & deploy Subnet A
- Create & deploy Subnet B
- Issue an export Tx on Subnet A
- Issue an import Tx on Subnet B
- Confirm Txs processed correctly
Note: This demo requires avalanche-cli version > 1.0.5, xsvm version > 1.0.2 and avalanche-network-runner v1.3.5.
Create and Deploy Subnet A, Subnet B
Using the avalanche-cli, this step deploys two subnets running the XSVM. Subnet A will act as the sender in this demo, and Subnet B will act as the receiver.
Steps
Build the XSVM
Create a genesis file
xsvm chain genesis --encoding binary > xsvm.genesis
Create Subnet A and Subnet B
avalanche subnet create subnetA --custom --genesis <path_to_genesis> --vm <path_to_vm_binary>
avalanche subnet create subnetB --custom --genesis <path_to_genesis> --vm <path_to_vm_binary>
Deploy Subnet A and Subnet B
avalanche subnet deploy subnetA --local
avalanche subnet deploy subnetB --local
Issue Export Tx from Subnet A
The SubnetID and ChainIDs are stored in the sidecar.json files in your avalanche-cli directory. Typically this is located at $HOME/.avalanche/subnets/
xsvm issue export --source-chain-id <SubnetA.BlockchainID> --amount <export_amount> --destination-chain-id <SubnetB.BlockchainID>
Save the TxID printed out by running the export command.
Issue Import Tx from Subnet B
Note: The import tx requires snowman++ consensus to be activated on the importing chain. A chain requires ~3 blocks to be produced for snowman++ to start. Run
xsvm issue transfer --chain-id <SubnetB.BlockchainID> --amount 1000to issue simple Txs on SubnetB
xsvm issue import --source-chain-id <SubnetA.BlockchainID> --destination-chain-id <SubnetB.BlockchainID> --tx-id <exportTxID> --source-uris <source_uris>
The <source_uris> can be found by running
avalanche network status. The default URIs are "http://localhost:9650,http://localhost:9652,http://localhost:9654,http://localhost:9656,http://localhost:9658"
Account Values
To check proper execution, use the xsvm account command to check balances.
Verify the balance on SubnetA decreased by your export amount using
xsvm account --chain-id <SubnetA.BlockchainID>
Now verify chain A's assets were successfully imported to SubnetB
xsvm account --chain-id <SubnetB.BlockchainID> --asset-id <SubnetA.BlockchainID>
Documentation
¶
Index ¶
- Constants
- Variables
- type Factory
- type VM
- func (vm *VM) BuildBlock(ctx context.Context) (snowman.Block, error)
- func (vm *VM) BuildBlockWithContext(ctx context.Context, blockContext *smblock.Context) (snowman.Block, error)
- func (*VM) Connected(context.Context, ids.NodeID, *version.Application) error
- func (vm *VM) CreateHandlers(context.Context) (map[string]http.Handler, error)
- func (*VM) CreateStaticHandlers(context.Context) (map[string]http.Handler, error)
- func (*VM) Disconnected(context.Context, ids.NodeID) error
- func (vm *VM) GetBlock(_ context.Context, blkID ids.ID) (snowman.Block, error)
- func (vm *VM) GetBlockIDAtHeight(_ context.Context, height uint64) (ids.ID, error)
- func (*VM) HealthCheck(context.Context) (interface{}, error)
- func (vm *VM) Initialize(_ context.Context, chainContext *snow.Context, db database.Database, ...) error
- func (vm *VM) LastAccepted(context.Context) (ids.ID, error)
- func (vm *VM) ParseBlock(_ context.Context, blkBytes []byte) (snowman.Block, error)
- func (vm *VM) SetPreference(_ context.Context, preferred ids.ID) error
- func (vm *VM) SetState(_ context.Context, state snow.State) error
- func (vm *VM) Shutdown(context.Context) error
- func (*VM) VerifyHeightIndex(context.Context) error
- func (*VM) Version(context.Context) (string, error)
Constants ¶
const Name = "xsvm"
Variables ¶
var ( ID = ids.ID{'x', 's', 'v', 'm'} Version = &version.Semantic{ Major: 1, Minor: 0, Patch: 4, } )
Functions ¶
This section is empty.
Types ¶
type VM ¶
type VM struct {
common.AppHandler
// contains filtered or unexported fields
}
Source Files
Directories