Daemon service which loads LidoOracle events for validator exits and sends out exit messages when necessary.
On start, it will load events from a configurable amount of blocks behind and then poll for new events.
- Folder of pre-signed exit messages as individual JSON files in either spec format (generic) or ethdo output format
- Execution node
- Consensus node
This service has to be run in a single instance as it expects to fulfil every request to exit. Each unfulfilled request (no exit message being present for required validator) will log an error.
For both modes, Ejector will monitor exit request events, but react to them differently.
In this mode, Ejector will load pre-signed exit messages from .json files on start, validate them, and submit them to a CL node when necessary.
Mode is activated by setting the MESSAGES_LOCATION variable.
In this mode, Ejector will make a request to a specified endpoint when an exit needs to be made instead of submitting a pre-signed exit message to a CL node.
Mode is activated by setting the VALIDATOR_EXIT_WEBHOOK variable.
This allows NOs to implement JIT approach by offloading exiting logic to an external service and using the Ejector as a secure exit events reader.
On the endpoint, JSON will be POSTed with the following structure:
{
"validatorIndex": "123",
"validatorPubkey": "0x123"
}200 response from the endpoint will be counted as a successful exit, non-200 as a fail.
Options are configured via environment variables.
| Variable | Required | Default/Example | Description |
|---|---|---|---|
| EXECUTION_NODE | Yes | http://1.2.3.4:8545 | Ethereum Execution Node endpoint |
| CONSENSUS_NODE | Yes | http://1.2.3.4:5051 | Ethereum Consensus Node endpoint |
| LOCATOR_ADDRESS | Yes | 0x123 | Address of the Locator contract Goerli / Mainnet |
| STAKING_MODULE_ID | Yes | 123 | Staking Module ID for which operator ID is set, currently only one exists - (NodeOperatorsRegistry) with id 1 |
| OPERATOR_ID | Yes | 123 | Operator ID in the Node Operators registry, easiest to get from Operators UI: Goerli/Mainnet |
| MESSAGES_LOCATION | No | messages | Local folder or external storage bucket url to load json exit message files from. Required if you are using exit messages mode |
| VALIDATOR_EXIT_WEBHOOK | No | http://webhook | POST validator info to an endpoint instead of sending out an exit message in order to initiate an exit. Required if you are using webhook mode |
| ORACLE_ADDRESSES_ALLOWLIST | Yes | ["0x123"] | Allowed Oracle addresses to accept transactions from Goerli / Mainnet |
| MESSAGES_PASSWORD | No | password | Password to decrypt encrypted exit messages with. Needed only if you encrypt your exit messages |
| MESSAGES_PASSWORD_FILE | No | password_inside.txt | Path to a file with password inside to decrypt exit messages with. Needed only if you have encrypted exit messages. If used, MESSAGES_PASSWORD (not MESSAGES_PASSWORD_FILE) needs to be added to LOGGER_SECRETS in order to be sanitized |
| BLOCKS_PRELOAD | No | 50000 | Amount of blocks to load events from on start. Increase if daemon was not running for some time. Defaults to a week of blocks |
| BLOCKS_LOOP | No | 900 | Amount of blocks to load events from on every poll. Defaults to 3 hours of blocks |
| JOB_INTERVAL | No | 384000 | Time interval in milliseconds to run checks. Defaults to time of 1 epoch |
| HTTP_PORT | No | 8989 | Port to serve metrics and health check on |
| RUN_METRICS | No | false | Enable metrics endpoint |
| RUN_HEALTH_CHECK | No | true | Enable health check endpoint |
| LOGGER_LEVEL | No | info | Severity level from which to start showing errors eg info will hide debug messages |
| LOGGER_FORMAT | No | simple | Simple or JSON log output: simple/json |
| LOGGER_SECRETS | No | ["MESSAGES_PASSWORD"] | JSON string array of either env var keys to sanitize in logs or exact values |
| DRY_RUN | No | false | Run the service without actually sending out exit messages |
| FORCE_DENCUN_FORK_MODE | No | false | Start the service in Dencun fork mode |
Messages can also be loaded from remote storages: AWS S3 and Google Cloud Storage.
Simply set a url with an appropriate protocol in MESSAGES_LOCATION:
s3://for S3gs://for GCS
Authentication setup: GCS, S3.
Once you generate and sign exit messages, you can encrypt them for storage safety.
Exit messages are encrypted and decrypted following the EIP-2335 spec.
You can check a simple example in JS in encryptor folder:
Simply copy JSON exit message files to encryptor/input, set encryption password as MESSAGES_PASSWORD in .env and run:
yarn encryptDone, your encrypted files will be in encryptor/output.
Either:
- Use a Docker image from Docker Hub
- Clone repo, install dependencies, build and start the service:
git clone https://github.com/lidofinance/validator-ejector.git
cd validator-ejector
yarn
yarn build
yarn startDon't forget env variables in the last command.
Enable metrics endpoint by setting HTTP_PORT=1234 and RUN_METRICS=true environment variables.
Metrics will be available on $HOST:$HTTP_PORT/metrics.
Available metrics:
- exit_messages: ['valid'] - Exit messages and their validity: JSON parseability, structure and signature
- exit_actions: ['result'] - Statuses of initiated validator exits
- event_security_verification: ['result'] - Statuses of exit event security verifications
- polling_last_blocks_duration_seconds: ['eventsNumber'] - Duration of pooling last blocks in microseconds
- execution_request_duration_seconds: ['result', 'status', 'domain'] - Execution node request duration in microseconds
- consensus_request_duration_seconds: ['result', 'status', 'domain'] - Consensus node request duration in microseconds
- job_duration_seconds: ['name', 'interval', 'result'] - Duration of Ejector cycle cron job
- job_message_reloader_duration_seconds: ['name', 'interval', 'result'] - Duration of Pre-signed message reloader cron job
- exit_messages_left_number - Number of exit messages left
- exit_messages_left_percent - Percentage of exit messages left
- Encrypted messages allow for secure file storage
- Invalid files in messages folder are noticed
- Exit JSON structure is checked
- Exit signature is fully validated
- Exit event pubkeys are checked to exist in transaction data
- Exit event report data hashes are checked to match hashes in original submitReport() Oracle transactions
- Exit events original consensus transactions are checked to be signed by allowlisted Oracles
- Node requests are repeated on error or timeouts
- Amount of messages left to send out can be checked using metrics
- Dry run mode to test setup
When you try to use Lido Validator Ejector on ARM, you may encounter an unexpected problem related to the inability to install @chainsafe/blst dependencies under darwin arm64.
It happens because https://www.npmjs.com/package/@chainsafe/blst doesn't provide native C binding to https://github.com/supranational/blst under darwin arm64. Such as there no native binding, a user has to compile C binding to blst lab manually for darwin arm64. @chainsafe/blst has compile option but inside itself for downloading dependencies this lib uses Python language. Historically MacOs uses alias python3 for python. So then @chainsafe/blst fails with an error that it could not install all dependencies. To fix it on MacOs just create alias python for python3.
ln -s /opt/homebrew/bin/python3 /usr/local/bin/pythonMore info here - ChainSafe/lodestar#4767 (comment)