How do I specify a custom retry policy for AWS SDK JavaScript V3 using customBackoff?

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To specify a custom retry policy for AWS SDK JavaScript V3 using customBackoff, you can follow these steps:

1. Import the RetryStrategy class from the SDK:

const { RetryStrategy } = require("@aws-sdk/util-retry");

1. Define your custom retry policy function using the RetryStrategy class:

const customRetryPolicy = new RetryStrategy({
  // Define your retry policy options here
  retry: (next, context) => {
    // Define your custom backoff logic here
    const customBackoff = calculateCustomBackoff(context.retriesAttempted);
    // Call the `next` function to execute the API request with retries
    return next(customBackoff, context);
  },
});

In the above code, the retry function takes in two arguments next and context. The next function is used to execute the API request with retries, and the customBackoff argument is used to control the delay between retries. The context argument contains information about the previous retries, including the number of retries attempted so far.

1. Use the custom retry policy function when creating your AWS service client:

const { S3Client } = require("@aws-sdk/client-s3");

const s3Client = new S3Client({
  region: "your-region",
  retryStrategy: customRetryPolicy,
});

In the above code, the retryStrategy option is set to the customRetryPolicy function that was defined earlier. This will cause all API requests made with this AWS client to use the custom retry policy.

1. That's it! You can now use the AWS client to make API requests with your custom retry policy.