# messenger-batch

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> Gracefully batching messenger requests.

## Installation

```sh
npm install messenger-batch
```

This module is based on the approach described in [Making Batch Requests](https://developers.facebook.com/docs/graph-api/making-multiple-requests/).

## Usage

```js
const { MessengerClient, MessengerBatch } = require('messaging-api-messenger');
const { MessengerBatchQueue } = require('messenger-batch');

const client = MessengerClient.connect({
  accessToken: ACCESS_TOKEN,
});

const queue = new MessengerBatchQueue(client);

(async () => {
  await queue.push(
    MessengerBatch.sendText('psid', 'hello!');
  );

  await queue.push(
    MessengerBatch.sendMessage('psid', {
      attachment: {
        type: 'image',
        payload: {
          url:
            'https://cdn.free.com.tw/blog/wp-content/uploads/2014/08/Placekitten480-g.jpg',
        },
      },
    })
  );

  const profile = await queue.push(MessengerBatch.getUserProfile('psid'));


  console.log(profile);
})();
```

Retry for error: `(#613) Calls to this api have exceeded the rate limit.`.

```js
const { MessengerBatchQueue, isError613 } = require('messenger-batch');

const queue = new MessengerBatchQueue(client, {
  shouldRetry: isError613,
  retryTimes: 2,
});
```

## Options

### delay

Default: `1000`.

### retryTimes

Default: `0`.

### shouldRetry

Default: `() => true`.

## License

MIT © [Yoctol](https://github.com/Yoctol/messenger-batch)