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Relayer

Relayer service that streams transactions from blockchain networks, packages data into messages, and sends the packages to the correlated bridge component.

Development

Run mage to see a list of available tasks (building, testing, linting, etc).

To enable revive for linting in VS-code, add the following to your config:

{
    "go.lintTool": "revive",
    "go.lintFlags": [
        "-config=${workspaceFolder}/revive.toml"
    ],
}

Contract Bindings

The relayer relies on dynamically generated bindings for our Ethereum contracts. They need to be updated whenever the contracts change.

Compile the contracts in the contracts directory:

forge build

Generate contract bindings:

go generate ./...

SSZ Encodings

To generate the SSZ encodings:

go install github.com/ferranbt/fastssz/sszgen
sszgen --path relays/beacon/state/beacon.go --objs BeaconStateCapellaMainnet,BlockRootsContainerMainnet,TransactionsRootContainer,BeaconBlockCapellaMainnet,WithdrawalsRootContainerMainnet

Configuration

Note: For local development and testing, we use our E2E test stack described here. It automatically generates suitable relayer configurations for testing.

For an example configuration, please consult the setup script for our local development stack. Specifically the start_relayer bash function.

Tests

To run both unit and integration tests, start a local E2E test stack and run the following command:

mage test

Running

Run message relayer with multiple instances

Configuration required for different relayers to coordinate. Take execution-relay which relayes message from Ethereum to AssetHub for example, assuming there are 3 instances deployed:

execution-relay-asset-hub-0.json


{
  ...
  "schedule": {
    "id": 0,
    "totalRelayerCount": 3,
    "sleepInterval": 20
  }
}

execution-relay-asset-hub-1.json


{
  ...
  "schedule": {
    "id": 1,
    "totalRelayerCount": 3,
    "sleepInterval": 20
  }
}

execution-relay-asset-hub-2.json


{
  ...
  "schedule": {
    "id": 2,
    "totalRelayerCount": 3,
    "sleepInterval": 20
  }
}
  • id: ID of current relayer(start from 0)
  • totalRelayerCount: Number of total count of all relayers
  • sleepInterval: Sleep interval(in seconds) to check if message(nonce) has already been relayed

The configuration above applies also to multiple instances of parachain-relay which relayes message from AssetHub to Ethereum.

Cost Analysis

Running Ethereum message relayer

For Ethereum message relayer take extrinsic for example:

As we can see it will cost 0.041163771 DOT as transaction fee and the reward is 0.053783 DOT, so it's about 0.012 DOT as incentive for each message.

Running Parachain message relayer

For Parachain message relayer take transaction for example:

As we can see it will cost 0.000628 ETH as transaction fee and the reward is 0.000942 ETH, so it's about 0.0003 ETH as incentive for each message.