# AWS OpenTelemetry X-Ray IdGenerator

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

The OpenTelemetry IdGenerator for AWS X-Ray generates trace IDs with its first four bytes set to the start time of the
trace followed by a unique identifier consisting of 12 bytes of randomly generated numbers. OpenTelemetry offers an
extension point which allows the usage of this custom IdGenerator as opposed to the out-of-the-box random IdGenerator,
enabling compatibility with AWS X-Ray.

## Status

| Maturity                               | [Component Owner](../../.github/component_owners.yml) | Compatibility         |
| -------------------------------------- | ----------------------------------------------------- | --------------------- |
| [Stable](../../CONTRIBUTING.md#stable) | @jj22ee                                               | API 1.0+<br/>SDK 1.0+ |

## Installation

```bash
npm install --save @opentelemetry/id-generator-aws-xray
```

## Usage

In the [global tracer configuration file](https://opentelemetry.io/docs/instrumentation/js/getting-started/nodejs/#setup), configure the following:

```js
const { NodeTracerProvider } = require('@opentelemetry/sdk-trace-node');
const { AWSXRayIdGenerator } = require('@opentelemetry/id-generator-aws-xray');

const tracerConfig = {
  idGenerator: new AWSXRayIdGenerator(),
  resources: resources
};
const tracerProvider = new NodeTracerProvider(tracerConfig);
```

## Trace ID Details

Example trace ID format: 58406520a006649127e371903a2de979

A trace ID consists of two parts:

1. **Timestamp**: The first 8 hexadecimal digits represent the time of the original request in Unix epoch time. For example, 10:00 AM December 1st, 2016 PST in epoch time is 1480615200 seconds, or 58406520 in hexadecimal digits.
2. **Unique Identifier**: The last 24 hexadecimal digits is an random identifier for the trace.

## 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/id-generator-aws-xray
[npm-img]: https://badge.fury.io/js/%40opentelemetry%2Fid-generator-aws-xray.svg