POA Token Bridge / Monitor

Tool for checking balances and unprocessed events in bridged networks.

Overview

Please refer to the POA Token Bridge overview first of all.

• Deployed version: https://bridge-monitoring.poa.net/

This tool allows you to spin up a NODE.JS server to monitor for health of the Token Bridge contracts: check for the balance difference, discover inconsistency in the validators list, catch unhandled transactions.

Examples

Example of an API

• GET / - check contract balances & tx numbers

{
    "home": {
        "balance": "3710077.6896438415780044",
        "deposits": 481,
        "withdrawals": 221
    },
    "foreign": {
        "totalSupply": "3710077.6896438415780044",
        "deposits": 481,
        "withdrawals": 221
    },
    "balanceDiff": 0,
    "lastChecked": 1529511982,
    "depositsDiff": 0,
    "withdrawalDiff": 0
}

• GET /validators - check validators balances

{
    "home": {
        "validators": {
            "0x35DC13c72A9C09C8AEEBD0490C7228C43Ccc38Cd": {
                "balance": "19.994900374",
                "leftTx": 66649667913333,
                "gasPrice": 1
            },
            "0x5D44BC8642947685F45004c936245B969F9709a6": {
                "balance": "19.993736069",
                "leftTx": 66645786896666,
                "gasPrice": 1
            },
            "0x284877074B986A78F01D7Eb1f34B6043b1719002": {
                "balance": "19.995139875",
                "leftTx": 66650466250000,
                "gasPrice": 1
            }
        },
        "requiredSignatures": 2
    },
    "foreign": {
        "validators": {
            "0x35DC13c72A9C09C8AEEBD0490C7228C43Ccc38Cd": {
                "balance": "19.084023268196",
                "leftTx": 28915,
                "gasPrice": 2.2
            },
            "0x5D44BC8642947685F45004c936245B969F9709a6": {
                "balance": "19.086724777075",
                "leftTx": 28919,
                "gasPrice": 2.2
            },
            "0x284877074B986A78F01D7Eb1f34B6043b1719002": {
                "balance": "19.050074813935",
                "leftTx": 28863,
                "gasPrice": 2.2
            }
        },
        "requiredSignatures": 2
    },
    "requiredSignaturesMatch": true,
    "validatorsMatch": true,
    "lastChecked": 1529512164
}

• GET /eventsStats - check unprocessed events

{
    "onlyInHomeDeposits": [],
    "onlyInForeignDeposits": [],
    "onlyInHomeWithdrawals": [],
    "onlyInForeignWithdrawals": [],
    "lastChecked": 1529512436
}

How to run

Setup

1. Initialize the monorepository.

2. Go to the monitor sub-repository:

cd monitor

3. Create .env file:

cp .env.example .env

Example:

HOME_RPC_URL=https://sokol.poa.network
FOREIGN_RPC_URL=https://kovan.infura.io/mew
HOME_BRIDGE_ADDRESS=0xABb4C1399DcC28FBa3Beb76CAE2b50Be3e087353
FOREIGN_BRIDGE_ADDRESS=0xE405F6872cE38a7a4Ff63DcF946236D458c2ca3a
GAS_PRICE_SPEED_TYPE=standard
GAS_LIMIT=300000
GAS_PRICE_FALLBACK=21
LEFT_TX_THRESHOLD=100

Check balances of contracts and validators

node checkWorker.js

Check unprocessed events

node checkWorker2.js

Run web interface

yarn start

To enabled debug logging, set DEBUG=1 env variable.

You can create cron job to run workers (see crontab.example for reference):

#crontab -e
*/4 * * * * cd $HOME/bridge-monitor; node checkWorker.js >>cronWorker.out 2>>cronWorker.err
*/5 * * * * cd $HOME/bridge-monitor; node checkWorker2.js >>cronWorker2.out 2>>cronWorker2.err

You can run web interface via pm2 or similar supervisor program.

Linting

Running linter:

yarn lint

Contributing

See the CONTRIBUTING document for contribution, testing and pull request protocol.

License

This project is licensed under the GNU Lesser General Public License v3.0. See the LICENSE file for details.