# OpenTelemetry instrumentation for cassandra-driver

[![NPM Published Version][npm-img]][npm-url]
[![Apache License][license-image]][license-image]

This module provides automatic instrumentation for the injection of trace context to [`cassandra-driver`](https://www.npmjs.com/package/cassandra-driver), which may be loaded using the [`@opentelemetry/sdk-trace-node`](https://github.com/open-telemetry/opentelemetry-js/tree/main/packages/opentelemetry-sdk-trace-node) package and is included in the [`@opentelemetry/auto-instrumentations-node`](https://www.npmjs.com/package/@opentelemetry/auto-instrumentations-node) bundle.

If total installation size is not constrained, it is recommended to use the [`@opentelemetry/auto-instrumentations-node`](https://www.npmjs.com/package/@opentelemetry/auto-instrumentations-node) bundle with [@opentelemetry/sdk-node](`https://www.npmjs.com/package/@opentelemetry/sdk-node`) for the most seamless instrumentation experience.

Compatible with OpenTelemetry JS API and SDK `1.0+`.

## Installation

```bash
npm install --save @opentelemetry/instrumentation-cassandra-driver
```

### Supported Versions

- [`cassandra-driver`](https://www.npmjs.com/package/cassandra-driver) versions `>=4.4.0 <5`

## Usage

```js
const { NodeTracerProvider } = require('@opentelemetry/sdk-trace-node');
const { CassandraDriverInstrumentation } = require('@opentelemetry/instrumentation-cassandra-driver');
const { registerInstrumentations } = require('@opentelemetry/instrumentation');

const provider = new NodeTracerProvider();
provider.register();

registerInstrumentations({
  instrumentations: [
    new CassandraDriverInstrumentation(),
    // other instrumentations
  ],
});

const cassandra = require('cassandra-driver');
const client = new cassandra.Client({ ... });
await client.execute('select * from foo');
```

### Instrumentation options

| Option                      | Type                                             | Default     | Description                                                                                                                                                                                                                    |
| --------------------------- | ------------------------------------------------ | ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| `enhancedDatabaseReporting` | `boolean`                                        | `false`     | Whether to include database queries with spans. These can contain sensitive information when using unescaped parameters - i.e. `insert into persons (name) values ('Bob')` instead of `insert into persons (name) values (?)`. |
| `responseHook`              | `CassandraDriverResponseCustomAttributeFunction` | `undefined` | Hook for adding custom attributes before response is handled                                                                                                                                                                   |
| `maxQueryLength`            | `number`                                         | `65536`     | If `enhancedDatabaseReporting` is enabled, limits the attached query strings to this length.                                                                                                                                   |

## Semantic Conventions

This instrumentation implements Semantic Conventions (semconv) v1.7.0. Since then, networking (in semconv v1.23.1) and database (in semconv v1.33.0) semantic conventions were stabilized. As of `@opentelemetry/instrumentation-cassandra-driver@0.55.0` support has been added for migrating to the stable semantic conventions using the `OTEL_SEMCONV_STABILITY_OPT_IN` environment variable as follows:

1. Upgrade to the latest version of this instrumentation package.
2. Set `OTEL_SEMCONV_STABILITY_OPT_IN=http/dup,database/dup` to emit both old and stable semantic conventions. (The `http` token is used to control the `net.*` attributes, the `database` token to control the `db.*` attributes.)
3. Modify alerts, dashboards, metrics, and other processes in your Observability system to use the stable semantic conventions.
4. Set `OTEL_SEMCONV_STABILITY_OPT_IN=http,database` to emit only the stable semantic conventions.

By default, if `OTEL_SEMCONV_STABILITY_OPT_IN` includes neither of the above tokens, the old v1.7.0 semconv is used. The intent is to provide an approximate 6 month time window for users of this instrumentation to migrate to the new database and networking semconv, after which a new minor version will use the new semconv by default and drop support for the old semconv.

See [the HTTP migration guide](https://opentelemetry.io/docs/specs/semconv/non-normative/http-migration/) and the [database migration guide](https://opentelemetry.io/docs/specs/semconv/non-normative/db-migration/) for details.

### Attributes

| Old semconv     | Stable semconv   | Description                             |
| --------------- | ---------------- | --------------------------------------- |
| `db.system`     | `db.system.name` | Database system identifier (cassandra). |
| `db.statement`  | `db.query.text`  | The database query being executed.      |
| `db.name`       | `db.namespace`   | The keyspace being accessed.            |
| `db.user`       | _(removed)_      | Username for accessing the database.    |
| `net.peer.name` | `server.address` | Remote hostname or similar.             |
| `net.peer.port` | `server.port`    | Remote port number.                     |

## Useful links

- For more information on OpenTelemetry, visit: <https://opentelemetry.io/>
- For more about OpenTelemetry JavaScript: <https://github.com/open-telemetry/opentelemetry-js>
- For help or feedback on this project, join us in [GitHub Discussions][discussions-url]

## License

Apache 2.0 - See [LICENSE][license-url] for more information.

[discussions-url]: https://github.com/open-telemetry/opentelemetry-js/discussions
[license-url]: https://github.com/open-telemetry/opentelemetry-js-contrib/blob/main/LICENSE
[license-image]: https://img.shields.io/badge/license-Apache_2.0-green.svg?style=flat
[npm-url]: https://www.npmjs.com/package/@opentelemetry/instrumentation-cassandra-driver
[npm-img]: https://badge.fury.io/js/%40opentelemetry%2Finstrumentation-cassandra-driver.svg