Archiving notice:
This library is no longer in use and maintenance. All further development related to chainbridge will happen in the new repo. More detailed information about chainbridge-core you can find in its readme or Discussions.
If you already running an old ChainBridge version please consider checking chainbridge-migration scripts that allow migrating to a newer version of chainbridge.
ChainBridge
Contents
Getting Started
- Check out our documentation.
- Try running ChainBridge locally.
- Chat with us on discord.
Installation
Dependencies
- Subkey: Used for substrate key management. Only required if connecting to a substrate chain.
Building
make build: Builds chainbridge in ./build.
or
make install: Uses go install to add chainbridge to your GOBIN.
Docker
The official ChainBridge Docker image can be found here.
To build the Docker image locally run:
docker build -t chainsafe/chainbridge .
To start ChainBridge:
docker run -vuses an absolute path rather than a relative one.
docker run -v $(pwd)/config.json:/config.json chainsafe/chainbridge
Configuration
Note: TOML configs have been deprecated in favour of JSON
A chain configurations take this form:
{
"name": "eth", // Human-readable name
"type": "ethereum", // Chain type (eg. "ethereum" or "substrate")
"id": "0", // Chain ID
"endpoint": "ws://<host>:<port>", // Node endpoint
"from": "0xff93...", // On-chain address of relayer
"opts": {}, // Chain-specific configuration options (see below)
}
See config.json.example for an example configuration.
Ethereum Options
Ethereum chains support the following additional options:
{
"bridge": "0x12345...", // Address of the bridge contract (required)
"erc20Handler": "0x1234...", // Address of erc20 handler (required)
"erc721Handler": "0x1234...", // Address of erc721 handler (required)
"genericHandler": "0x1234...", // Address of generic handler (required)
"maxGasPrice": "0x1234", // Gas price for transactions (default: 20000000000)
"minGasPrice": "0x1234", // Minimum gas price for transactions (default: 0)
"gasLimit": "0x1234", // Gas limit for transactions (default: 6721975)
"gasMultiplier": "1.25", // Multiplies the gas price by the supplied value (default: 1)
"http": "true", // Whether the chain connection is ws or http (default: false)
"startBlock": "1234", // The block to start processing events from (default: 0)
"blockConfirmations": "10" // Number of blocks to wait before processing a block
"useExtendedCall": "true" // Extend extrinsic calls to substrate with ResourceID. Used for backward compatibility with example pallet. *Default: false*
"egsApiKey": "xxx..." // API key for Eth Gas Station (https://www.ethgasstation.info/)
"egsSpeed": "fast" // Desired speed for gas price selection, the options are: "average", "fast", "fastest"
}
Substrate Options
Substrate supports the following additonal options:
{
"startBlock": "1234" // The block to start processing events from (default: 0)
}
Blockstore
The blockstore is used to record the last block the relayer processed, so it can pick up where it left off.
If a startBlock option is provided (see Configuration), then the greater of startBlock and the latest block in the blockstore is used at startup.
To disable loading from the blockstore specify the --fresh flag. A custom path for the blockstore can be provided with --blockstore <path>. For development, the --latest flag can be used to start from the current block and override any other configuration.
Keystore
ChainBridge requires keys to sign and submit transactions, and to identify each bridge node on chain.
To use secure keys, see chainbridge accounts --help. The keystore password can be supplied with the KEYSTORE_PASSWORD environment variable.
To import external ethereum keys, such as those generated with geth, use chainbridge accounts import --ethereum /path/to/key.
To import private keys as keystores, use chainbridge accounts import --privateKey key.
For testing purposes, chainbridge provides 5 test keys. The can be used with --testkey <name>, where name is one of Alice, Bob, Charlie, Dave, or Eve.
Metrics
See metrics.md.
Chain Implementations
-
Ethereum (Solidity): chainbridge-solidity
The Solidity contracts required for chainbridge. Includes deployment and interaction CLI.
The bindings for the contracts live in
bindings/. To update the bindings modifyscripts/setup-contracts.shand then runmake clean && make setup-contracts -
Substrate: chainbridge-substrate
A substrate pallet that can be integrated into a chain, as well as an example pallet to demonstrate chain integration.
Docs
MKdocs will generate static HTML files for Chainsafe markdown files located in Chainbridge/docs/
make install-mkdocs: Pull the docker image MkDocs
make mkdocs: Run MkDoc's docker image, building and hosting the html files on localhost:8000
Testing
Unit tests require an ethereum node running on localhost:8545 and a substrate node running on localhost:9944. E2E tests require an additional ethereum node on localhost:8546.
A docker-compose file is provided to run two Geth nodes and a chainbridge-substrate-chain node in isolated environments:
$ docker-compose -f ./docker-compose-e2e.yml up
See chainbridge-solidity and chainbridge-substrate-chain for more information on testing facilities.
All Go tests can be run with:
$ make test
Go tests specifically for ethereum, substrate and E2E can be run with
$ make test-eth
$ make test-sub
$ make test-e2e
ChainSafe Security Policy
Reporting a Security Bug
We take all security issues seriously, if you believe you have found a security issue within a ChainSafe project please notify us immediately. If an issue is confirmed, we will take all necessary precautions to ensure a statement and patch release is made in a timely manner.
Please email us a description of the flaw and any related information (e.g. reproduction steps, version) to security at chainsafe dot io.