Access Fauna Logs using the HTTP API

You can use the Fauna Logs endpoints of the Fauna Account HTTP API to request and download Fauna Logs programmatically.

For more information about the API, check out the Fauna Account API reference docs.

Create an account key

To authenticate the Fauna Account API requests, you must have an account key. You can create an account key in the Fauna Dashboard.

Log in to the Fauna Dashboard and click Account in the left navigation.
Click Account Keys.
Click Create Key.
Enter a Name and an optional TTL. The TTL is the number of days until the account key expires.
Click Create.
Copy the Key Secret.

You can pass the secret as a Bearer token in Fauna Account API requests.

API workflow

To fetch logs using the API, use the following workflow:

Make a request to the Request Fauna Logs HTTP API endpoint to initiate a request for a set of Fauna Logs.

You must specify:
- A region_group or database.
  
  If a database, you must provide a path to the database that includes the Region Group. For example, to request Fauna Logs for the ECommerce database in the us-std Region Group, use "database": "us-std/ECommerce".
- A time_start in ISO 8601 format.
- A time_end in ISO 8601 format. You can specify a future time. The interval between the time_start and time_end can’t exceed 90 days.
```
curl -X POST \
  'https://account.fauna.com/api/v1/logs?type=query' \
  -H 'Authorization: Bearer <ACCOUNT_KEY_SECRET>' \
  -H 'Content-Type: application/json' \
  -d '{
    "database": "us-std/ECommerce",
    "time_start": "2099-07-10T07:46:05Z",
    "time_end": "2099-07-11T07:46:05Z"
  }'
```
The response includes a request_id you can use to check the status of the request:
```
{
  "request_id": "<REQUEST_ID>",
  "state": "Pending",
  "time_start": "2099-07-10T07:46:05Z",
  "time_end": "2099-07-11T07:46:05Z",
  "region_group": "us-std",
  "updated_at": "2099-07-11T21:53:47.398213Z",
  "version": 0,
  "database": "us-std/ECommerce"
}
```

Use the request ID to make a request to the Get Fauna Logs Request Status endpoint:

curl -X GET \
  'https://account.fauna.com/api/v1/logs/<REQUEST_ID>?type=query&regionGroup=us-std' \
  -H 'Authorization: Bearer <ACCOUNT_KEY_SECRET>'

The API response includes the Fauna Logs request’s current state. You can periodically poll the endpoint until the state is Complete.

Once Complete, the response includes a presigned_url that links to the compressed log file:

{
  "request_id": "<REQUEST_ID>",
  "state": "Complete",
  "time_start": "2099-07-10T07:46:05Z",
  "time_end": "2099-07-11T07:46:05Z",
  "region_group": "us-std",
  "updated_at": "2099-07-11T21:53:54.899268Z",
  "version": 2,
  "presigned_url": "https://link.to.your.logs.com",
  "presigned_url_expiration_time": "2099-07-11T22:53:54Z",
  "database": "us-std/ECommerce"
}

The presigned_url is valid until the presigned_url_expiration_time.

After the presigned_url_expiration_time, you can get a new log file link by making a request to the Create Fauna Logs File URL API endpoint:

curl -X POST \
  'https://account.fauna.com/api/v1/logs/<REQUEST_ID>/url?type=query&regionGroup=us-std' \
  -H 'Authorization: Bearer <ACCOUNT_KEY_SECRET>'

{
  "presigned_url": "https://new.link.to.your.logs.com",
  "state": "CreatingNewUrl",
  "time_end": "2099-07-11T07:46:05Z",
  "version": 3,
  "region_group": "us-std",
  "time_start": "2099-07-10T07:46:05Z",
  "request_id": "<REQUEST_ID>",
  "presigned_url_expiration_time": "2099-07-11T22:53:54Z",
  "updated_at": "2099-07-11T22:00:32.164516Z"
}

Example: Programmatically fetch Fauna Logs

The following Node.js application programmatically fetches Fauna Logs from the us-std Region Group. The app follows the general API workflow.

To run the app:

Create a project directory and navigate to it:
```
mkdir query-logs-demo
cd query-logs-demo
```
Install app dependencies:
```
npm install axios dotenv luxon winston
```
Create a .env file. In the file, set the ACCOUNT_KEY_SECRET environment variable to an account key secret:
```
// .env file
ACCOUNT_KEY_SECRET=fnacapi...
```

Create a node.js file and add the following JavaScript to it:

require('dotenv').config();
const axios = require('axios').default;
const winston = require('winston');
const { DateTime, Duration } = require("luxon");

const faunaClient = axios.create({
  baseURL: "https://account.fauna.com",
  timeout: 10000,
});

const logger = winston.createLogger({
  level: 'info',
  format: winston.format.json(),
  defaultMeta: { service: 'querylogs-demo' },
  transports: [
    new winston.transports.Console({
      level: "debug",
      handleExceptions: true,
      format: winston.format.json(),
    }),
  ],
});

const today = DateTime.now().toISO();
const yesterday = DateTime.now().minus(Duration.fromISO("P1D")).toISO();

async function getLogs() {
  if (process.env["ACCOUNT_KEY_SECRET"] === undefined) {
    throw new Error("You must set ACCOUNT_KEY_SECRET in your local environment to run this program!");
  }

  try {
    const headers = { Authorization: `Bearer ${process.env["ACCOUNT_KEY_SECRET"]}` };
    const { data: querylogRequest } = await faunaClient.post(
      "/api/v1/logs?type=query",
      { region_group: "us-std", time_start: yesterday, time_end: today},
      { headers }
    );
    logger.info(querylogRequest);
    return await pollResults(querylogRequest, headers, "us-std");
  } catch (error) {
    logger.error("Error in getLogs:", error);
    throw error;
  }
}

async function pollResults(
  querylogRequest,
  headers,
  region_group,
) {
  let result;
  const maxRuntimeMs = 300 * 1000;
  const time_start = DateTime.now();
  do {
    try {
      ({ data: result } = await faunaClient.get(
        `/api/v1/logs/${querylogRequest.request_id}?regionGroup=${region_group}&type=query`,
        { headers }
      ));
      await new Promise((resolve) => setTimeout(resolve, 1000));
      logger.info(`State: ${result.state}`);
    } catch (error) {
      logger.error("Error in polling:", error);
      throw error;
    }
  } while (
    DateTime.now().diff(time_start).as('milliseconds') < maxRuntimeMs &&
    !["Complete", "DoesNotExist", "Failed", "TimedOut"].includes(result.state)
  );
  logger.info(result);
  return result;
}

getLogs()
  .then(() => logger.info("Thanks for trying out Fauna Logs! Please give us any and all feedback!"))
  .catch(error => logger.error("An error occurred:", error));

Save app.js and run:
```
node app.js
```
The app prints console logs containing the Fauna Logs request’s state. When the Fauna Logs are ready for download, it prints a console log containing the presigned URL for the Fauna Logs file.

You can extend the app to download the logs and export them to a third-party service for visualization or analysis.

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