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Serves DLOB, fresh off the RPC

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<h1 style="margin-top:20px;">DLOB Server for Drift Protocol v2</h1>

# DLOB Server

This is the backend server that provides a REST API for the drift [DLOB](https://docs.drift.trade/about-v2/decentralized-orderbook).

## Features

- Real-time DLOB data publishing
- Support for both perp and spot markets
- Multiple subscription methods (WebSocket, gRPC, polling)
- Health checks and metrics
- **TOB (Top of Book) monitoring for stuck orders** (see [TOB Monitoring Configuration](#tob-monitoring-configuration))

# Run the server

## Setup

Install dependencies and build:

```
yarn install
yarn build
```

Set the necessary environment variables:

```
cp .env.example .env
```

## Security

### Pre-commit Hook

This repository uses [Husky](https://typicode.github.io/husky/) to manage Git hooks. A pre-commit hook automatically checks for potential secrets before each commit. The hook will:

- Scan for RPC URLs, API keys, tokens, and other potential secrets
- Prevent commits that contain suspicious patterns
- Provide helpful guidance if false positives are detected

The hook is automatically installed when you run `npm install` (via the `prepare` script). If you need to bypass it for a specific commit, use:

```bash
git commit --no-verify
```

### Scripts

The `scripts/` directory contains utility scripts:

- `check-secrets.sh` - Secret detection script used by the pre-commit hook

## Environment Variables

To properly configure the DLOB server, set the following environment variables in your `.env` file:

| Variable                      | Description                                                     | Example Value                       |
| ----------------------------- | --------------------------------------------------------------- | ----------------------------------- |
| `ENDPOINT`                    | The Solana RPC node http endpoint.                              | `https://your-private-rpc-node.com` |
| `WS_ENDPOINT`                 | The Solana RPC node websocket endpoint.                         | `wss://your-private-rpc-node.com`   |
| `USE_WEBSOCKET`               | Flag to enable WebSocket connection.                            | `true`                              |
| `USE_ORDER_SUBSCRIBER`        | Flag to enable order subscriber DLOB source.                    | `true`                              |
| `DISABLE_GPA_REFRESH`         | Flag to disable periodic refresh using `getProgramAccounts`.    | `true`                              |
| `ENV`                         | The network environment the server is connecting to.            | `mainnet-beta`                      |
| `PORT`                        | The port number the HTTP server listens on.                     | `6969`                              |
| `METRICS_PORT`                | The port number for Prometheus metrics.                         | `9465`                              |
| `PRIVATE_KEY`                 | Path to the Solana private key file.                            | `/path/to/keypair.json`             |
| `RATE_LIMIT_CALLS_PER_SECOND` | Maximum number of API calls per second.                         | `100`                               |
| `PERP_MARKETS_TO_LOAD`        | Number of perpetual markets to load at startup.                 | `0`                                 |
| `SPOT_MARKETS_TO_LOAD`        | Number of spot markets to load at startup.                      | `5`                                 |
| `ELASTICACHE_HOST`            | (for websocket server) Redis host endpoint.                     | `localhost`                         |
| `ELASTICACHE_PORT`            | (for websocket server) Redis port.                              | `6379`                              |
| `REDIS_CLIENT`                | (for websocket server) Redis client type (DLOB/DLOB_HELIUS).    | `DLOB`                              |
| `WS_PORT`                     | (for websocket server) The port to run the websocket server on. | `3000`                              |

Note: multiple Redis hosts can be provided by providing a comma separated string.

## HTTP mode

The HTTP server as documented [here](https://velocity-exchange.github.io/v2-teacher/?python#orderbook-trades-dlob-server) can be run with, and by default accessible on `http://127.0.0.1:6969`:

```
yarn run dev
```

## Websocket mode

The websocket server has 2 components, the `dlob-publisher` that takes frequent snapshots of the DLOB and publishes them to Redis, and `ws-manager` listens for new connections and sends the latest DLOB to ws clients, the two components communicate through Redis pub-sub.

To run the websocket server, a Redis cache is required, and the following environment variables must be set:

- `REDIS_HOSTS`
- `REDIS_PASSWORDS`
- `REDIS_PORTS`

In the first terminal, start the redis cluster:

```
bash redisCluster.sh start
bash redisCluster.sh create
```

In second terminal, run:

```
yarn run dlob-publish
```

In a third terminal, run:

```
yarn run ws-manager
```

Then connect to the ws server at ws://127.0.0.1:3000

When you're done, stop the redis cluster:

```
bash redisCluster.sh stop
```

# Run the example client

Documentation for connecting to the dlob server are available [here](https://velocity-exchange.github.io/v2-teacher/?python#orderbook-trades-dlob-server)

TODO: complete client examples.

## TOB (Top of Book) Monitoring [#tob-monitoring]

The server includes a TOB monitoring feature that detects when order books become stuck due to ghost/stuck orders. This is particularly useful for gRPC connections that may miss updates.

### Configuration

Set the following environment variables to enable and configure TOB monitoring:

- `ENABLE_TOB_MONITORING=true` - Enable TOB monitoring (default: false)
- `TOB_CHECK_INTERVAL=60000` - How often to check TOB (default: 60 seconds)
- `TOB_STUCK_THRESHOLD=60000` - How long TOB can be stuck before resubscribing (default: 60 seconds)
- `TOP_MONITORING_ENABLED_PERP_MARKETS=0,1,2` - Comma-separated list of perp market indexes to monitor for TOB (default: 0,1,2 for SOL-PERP, BTC-PERP, ETH-PERP)

### How it works

1. Checks if the current node is configured to handle any TOB monitoring markets
2. Only enables monitoring if the node has TOB monitoring markets configured
3. Monitors the top bid/ask prices for TOB monitoring perp markets on this node
4. If TOB hasn't changed for the configured threshold time, triggers a resubscribe
5. Performs unsubscribe → subscribe → fetch sequence on the OrderSubscriber instance
6. Logs warnings and updates metrics for monitoring

### Metrics

The following metrics are available for TOB monitoring:

- `tob_resubscribe` - Counter for resubscribe attempts (with success/failure labels)
- `tob_stuck_duration` - Gauge showing how long TOB has been stuck for each market

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