Webb Relayer ๐ธ๏ธ
๐ The Webb Relayer ๐งโ
๐ Table of Contents
Table of Contents
Getting Started ๐
In the Webb Protocol, the relayer plays a variety of roles. This repo contains code for an Anchor Protcol oracle, transaction and data relayer, and protocol governance participant. The aim is that these can all be run exclusive to one another to ensure maximum flexibility of external participants to the Webb Protocol.
The relayer system is composed of three main components. Each of these components should be thought of as entirely separate because they could be handled by different entities entirely.
- Private transaction relaying (of user bridge transactions like Tornado Cashโs relayer)
- Data querying (for zero-knowledge proof generation)
- Event listening, proposing, and signature relaying (of DKG proposals where the relayer acts like an oracle)
Transaction relaying role
Relayers who fulfill the role of a transaction relayer are responsible with exposing an API for clients who wish to relay their zero-knowledge transactions through and with submitting them. Relayers of this role must possess enough balance on the blockchains in which they will relay these transactions, since, after all, they must possess the native balance to pay the fees for these transactions. Relayers can be configured for any number of chains and protocols from mixers to variable anchors and run for individual chains or all of them that exist for a given bridged set of anchors.
Data querying role
Relayers who fulfill this role do so in conjunction with the transaction relaying role although it is not required to possess both. Namely, this role is concerned with listening to the events occurring within an Anchor Protocol instance and storing the data for clients who wish to quickly access it through traditional HTTP methods. This role is actively maintained and sees regular updates to how we hope to store and serve data in the future.
Oracle role
Relayers who fulfill the role of an oracle listen to the Anchor Protocol instances on the various chains the anchors exist on. When they hear of insertions into the anchors' merkle trees they handle them accordingly (as is implemented in the event watchers). Those playing this role then relay the anchor update information to other connected Anchors, the DKG governance system, and any other integration that gets implemented in this repo. Oracle relayers help keep the state of an Anchor Protocol instance up to date by ensuring that all anchors within an instance know about the latest state of their neighboring anchors.
For additional information, please refer to the Webb Relayer Rust Docs ๐. Have feedback on how to improve the relayer network? Or have a specific question to ask? Checkout the Relayer Feedback Discussion ๐ฌ.
Prerequisites
This repo uses Rust so it is required to have a Rust developer environment set up. First install and configure rustup:
# Install
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
# Configure
source ~/.cargo/env
Configure the Rust toolchain to default to the latest stable version, add nightly:
rustup default stable
rustup update
rustup update nightly
Great! Now your Rust environment is ready! ๐๐
Installation ๐ป
Unix (Linux, macOS, WSL2, ..)
git clone https://github.com/webb-tools/relayer.git
cargo build --release --features cli
Usage
Quick Start โก
Local EVM Setup
Eager to try out the Webb Relayer and see it in action? Run a relayer with our preset EVM Local Network configuration to get up and running immediately. You can follow this guide to use the relayer for the EVM bridge! You will have to configure an .env
file in the root directory as well. See below configuration section for more details.
# Update your local env file
cp ./config/development/evm-localnet/.env.example .env
cargo run --features cli -- -c ./config/development/evm-localnet -vvv
Hot Tip ๐ถ๏ธ: To increase the logger verbosity add additional
-vvvv
during start up command. You will now seeTRACE
logs. Happy debugging!
Local Substrate Mixer
To use the relayer for our Substrate mixer, you will first need to start a local substrate node that integrates with our pallets webb-standalone-node. Once the Substrate node is started locally you can proceed to start the relayer. You can follow this guide to use the relayer for the Substrate mixer!
cargo run --features cli -- -c ./config/development/local-substrate -vvv
Run ๐
Webb Relayer is easy to run and with flexible config ๐. The first step is to create a config file.
Example:
- Create an
.env
file with the following values for the networks you wish to support.
WEBB_EVM_<network>_ENABLED=true
WEBB_EVM_<network>_PRIVATE_KEY=<0X_PREFIXED_PRIVATE_KEY>
WEBB_EVM_<network>_BENEFICIARY=<0X_PREFIXED_ADDRESS>
Checkout config for useful default configurations for many networks. These config files can be changed to your preferences, and are enabled with the .env configuration listed above.
Then run:
webb-relayer -vv -c ./config
Hot Tip ๐ถ๏ธ: you could also use the
json
format for the config files if you prefer that!
Configuration
Note: You can also review the different chain configurations for EVM and Substrate.
Chain Configuration
Field | Description | Optionality |
---|---|---|
http-endpoint |
Http(s) Endpoint for quick Req/Res | Required |
ws-endpoint |
Websocket Endpoint for long living connections | Required |
name |
The Chain/Node name | Required |
explorer |
Block explorer, used for generating clickable links for transactions that happens on this chain. | Optional |
chain-id |
Chain specific id. | Required |
private-key |
The Private Key of this account on this network. See PrivateKey Docs for secure setup | Required |
beneficiary |
The address of the account that will receive relayer fees. | Optional |
runtime |
Indicates Substrate runtime to use | Required for Substrate |
suri |
Interprets a string in order to generate a key Pair. In the case that the pair can be expressed as a direct derivation from a seed | Required for Substrate |
pallets |
Supported pallets for a particular Substrate node | Optional |
Contract Configuration
Field | Description | Optionality |
---|---|---|
contract |
Chain contract. Must be either: - VAnchor - SignatureBridge |
Required |
address |
The address of this contract on this chain. | Required |
deployed-at |
The block number where this contract got deployed at. | Required |
events-watcher |
Control the events watcher for this contract. | Optional |
withdraw-config |
Config the fees and gas limits of your private transaction relayer. | Optional |
proposal-signing-backend |
a value of ProposalSigingBackend (for example { type = "DKGNode", node = "dkg-node" } ) |
Optional |
Docker ๐ณ
To use Docker to run the relayer, you will need to specify a config file and provide an .env
file as described above. Then proceed to save it into the config
directory.
To run docker image:
docker run --rm -v "<ABSOLUTE_PATH_TO_CONFIGS_DIRECTORY>:/config" --env-file .env -p 9955:9955 ghcr.io/webb-tools/relayer:edge
Note: this uses the latest and pre-released version deployed from
main
branch, changeedge
to the latest stable release version.
This will mount a configuration files at the /config
directory inside the container so it would allow it to read the configuration you added.
API ๐ก
The relayer has 3 endpoints available to query from. They are outlined below for your convenience.
Retrieving nodes IP address:
/api/v1/ip
Expected Response
{
"ip": "127.0.0.1"
}
Retrieve relayer configuration
/api/v1/info
Expected Response
{
"evm": {
"rinkeby": {
"enabled": true,
"chainId": 4,
"beneficiary": "0x58fcd47ece3ed24ace88fee06efd90dcb38f541f",
"contracts": [{
"contract": "Anchor",
"address": "0x626fec5ffa7bf1ee8ced7dabde545630473e3abb",
"deployedAt": 8896800,
"eventsWatcher": {
"enabled": true,
"pollingInterval": 15000
},
"size": 0.1,
"proposalSigningBackend": { "type": "DKGNode", "node": "dkg-local" },
"withdrawFeePercentage": 0.05
}]
}
},
"substrate": {},
"experimental": {
"smart-anchor-updates": false,
"smart-anchor-updates-retries": 0
}
}
Retrieve historical leaves cache
Parameters
target_system
(Could beevm
orsubstrate
).chain_id
contract_address
For evm
/api/v1/leaves/evm/4/0x626fec5ffa7bf1ee8ced7dabde545630473e3abb
For substrate
Note: Since substrate dosent have contract address we use
tree_id
/api/v1/leaves/substrate/4/9
Expected Response
{
"leaves": ["0x2e5c62af48845c095bfa9b90b8ec9f6b7bd98fb3ac2dd3039050a64b919951dd", "0x0f89f0ef52120b8db99f5bdbbdd4019b5ea4bcfef14b0c19d261268da8afdc24", "0x3007c62f678a503e568534487bc5b0bc651f37bbe1f34668b4c8a360f15ba3c3"],
"lastQueriedBlock": "0x9f30a8"
}
Testing ๐งช
The following instructions outlines how to run the relayer base test suite and E2E test suite.
To run base tests
cargo test
To run E2E tests
First you will need protocol-substrate
node, compiled locally (in release mode) and both the protocol-substrate
and relayer
project must be next to each other. The relayer must be compiled using --features integration-tests
.
Here is the basic setup you will need:
- Clone the Relayer repo
git clone https://github.com/webb-tools/relayer.git
- Clone Protocol Substrate node
https://github.com/webb-tools/protocol-substrate.git
- Then fetch the submodules for the node
cd protocol-substrate && git submodule update --init
- While you are there, build the standalone node
cargo build --release -p webb-standalone-node
- And then go back to the relayer
cd ../relayer
- Run
cargo build --features integration-tests
- Run
cd tests && git submodule update --init --recursive
- Run
yarn install
(intests
dir) yarn test
Tips for E2E tests
- If you want to run a specific test run
yarn test -fgrep <UNIQUE_PART_OF_TEST_NAME>
. - If you want to make the tests fail fast (fail on first error) run
yarn test --bail
. - by default, tests runs in parallel, to disable that run
yarn test --parallel=false
. - failing tests will keep retry before giving up, up to 5 times. To disable that use
yarn test --retries=0
. - You can combine all the tips above together, for more options see here
For the Substrate Mixer test, you can connect to your local chain manually by:
- Specifying the Alice node ports such as:
const aliceManualPorts = { ws: 9944, http: 9933, p2p: 30333 };
- Specifying the Bob node ports such as:
const bobManualPorts = { ws: 9945, http: 9934, p2p: 30334 };
- Make the
ports
property value be thealiceManualPorts
andbobManualPorts
respectively in theLocalNodeOpts
config which is the parameter inLocalProtocolSubstrate.start()
method. - Specifying and setting
isManual
flag totrue
in theLocalNodeOpts
config which is the parameter inLocalProtocolSubstrate.start()
method.
Contributing
Interested in contributing to the Webb Relayer Network? Thank you so much for your interest! We are always appreciative for contributions from the open-source community!
If you have a contribution in mind, please check out our Contribution Guide for information on how to do so. We are excited for your first contribution!
License
Licensed under Apache 2.0 license.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache 2.0 license, shall be licensed as above, without any additional terms or conditions.