78 lines
2.4 KiB
Markdown
78 lines
2.4 KiB
Markdown
# @smithy/util-retry
|
|
|
|
[](https://www.npmjs.com/package/@smithy/util-retry)
|
|
[](https://www.npmjs.com/package/@smithy/util-retry)
|
|
|
|
This package provides shared utilities for retries.
|
|
|
|
## Usage
|
|
|
|
### Default
|
|
|
|
By default, each client already has a default retry strategy. The default retry count is 3, and
|
|
only retryable errors will be retried.
|
|
|
|
[AWS Documentation: Retry behavior](https://docs.aws.amazon.com/sdkref/latest/guide/feature-retry-behavior.html).
|
|
|
|
```js
|
|
import { S3Client } from "@aws-sdk/client-s3";
|
|
|
|
const client = new S3Client({}); // default retry strategy included.
|
|
```
|
|
|
|
### MaxAttempts
|
|
|
|
If you want to change the number of attempts, you can provide `maxAttempts` configuration during client creation.
|
|
|
|
```js
|
|
import { S3Client } from "@aws-sdk/client-s3";
|
|
|
|
const client = new S3Client({ maxAttempts: 4 });
|
|
```
|
|
|
|
This is recommended because the `StandardRetryStrategy` includes backoff calculation,
|
|
deciding whether an error should be retried, and a retry token counter.
|
|
|
|
### MaxAttempts and BackoffComputation
|
|
|
|
If you want to change the number of attempts and use a custom delay
|
|
computation, you can use the `ConfiguredRetryStrategy` from `@smithy/util-retry`.
|
|
|
|
```js
|
|
import { S3Client } from "@aws-sdk/client-s3";
|
|
import { ConfiguredRetryStrategy } from "@smithy/util-retry";
|
|
|
|
const client = new S3Client({
|
|
retryStrategy: new ConfiguredRetryStrategy(
|
|
4, // max attempts.
|
|
(attempt: number) => 100 + attempt * 1000 // backoff function.
|
|
),
|
|
});
|
|
```
|
|
|
|
This example sets the backoff at 100ms plus 1s per attempt.
|
|
|
|
### MaxAttempts and RetryStrategy
|
|
|
|
If you provide both `maxAttempts` and `retryStrategy`, the `retryStrategy` will
|
|
get precedence as it's more specific.
|
|
|
|
```js
|
|
import { S3Client } from "@aws-sdk/client-s3";
|
|
import { ConfiguredRetryStrategy } from "@smithy/util-retry";
|
|
|
|
const client = new S3Client({
|
|
maxAttempts: 2, // ignored.
|
|
retryStrategy: new ConfiguredRetryStrategy(
|
|
4, // used.
|
|
(attempt: number) => 100 + attempt * 1000 // backoff function.
|
|
),
|
|
});
|
|
```
|
|
|
|
### Further customization
|
|
|
|
You can implement the `RetryStrategyV2` interface.
|
|
|
|
Source: https://github.com/awslabs/smithy-typescript/blob/main/packages/types/src/retry.ts
|
|
API Docs: https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/Package/-smithy-types/Interface/RetryStrategyV2/
|