Download Core

Provide a high performance download file function based on undici.

• Support download by range request
  • Customize the range size
• Support validating the checksum
  • If the validation matched, it won't download the file.
  • Also support customize validation.
• Support download and fallback to another url
• Support AbortSignal
• Fully customizable retry logic

Usage

Download the file by url

import { download } from '@xmcl/file-transfer'

await download({
  url: 'http://example.com/file.zip', // required
  destination: 'file.zip', // required
  headers: { // optional
    'customized': 'header'
  },
  abortSignal: new AbortController().signal, // optional
  progressController: (url, chunkSize, progress, total) => { // optional
    console.log(url)
    console.log(chunkSize)
    console.log(progress)
    console.log(total)
  },
  // use validator to validate the file
  validator: { // optional
    algorithm: 'sha1',
    hash: '1234567890abcdef1234567890abcdef12345678',
  }
})

Download with fallback url

import { download } from '@xmcl/file-transfer'

await download({
  // using array to fallback
  url: ['http://example.com/file.zip', 'http://example.com/fallback.zip'],
  destination: 'file.zip',
})

🧾 Classes

ChecksumNotMatchErrorChecksumValidatorDefaultRangePolicyDownloadErrorDownloadFileSystemErrorJsonValidatorValidationError

🤝 Interfaces

ChecksumValidatorOptionsDefaultRangePolicyOptionsDefaultRetryPolicyOptionsDownloadBaseOptionsDownloadOptionsProgressControllerRangeRangePolicyRetryPolicyValidator

🏭 Functions

createDefaultRetryHandler

createDefaultRetryHandler(maxRetryCount: number= 3): RetryPolicy

Parameters

• maxRetryCount: number

Return Type

• RetryPolicy

Defined in: packages/file-transfer/retry.ts:46

createProgressController

createProgressController(onProgress: ProgressController): ProgressController

Parameters

• onProgress: ProgressController

Return Type

• ProgressController

Defined in: packages/file-transfer/progress.ts:8

download

download(options: DownloadOptions): Promise<void>

Download url or urls to a file path. This process is abortable, it's compatible with the dom like AbortSignal.

Parameters

• options: DownloadOptions

Return Type

• Promise<void>

Defined in: packages/file-transfer/download.ts:266

getDefaultAgent

getDefaultAgent(retry: RetryOptions, defaultMaxRedirections: number= 5): ComposedDispatcher

Parameters

• retry: RetryOptions
• defaultMaxRedirections: number

Return Type

• ComposedDispatcher

Defined in: packages/file-transfer/agent.ts:3

getDownloadBaseOptions

getDownloadBaseOptions(options: T): DownloadBaseOptions

Parameters

• options: T

Return Type

• DownloadBaseOptions

Defined in: packages/file-transfer/download.ts:23

isRangePolicy

isRangePolicy(rangeOptions: RangePolicy | DefaultRangePolicyOptions): rangeOptions is RangePolicy

Parameters

• rangeOptions: RangePolicy | DefaultRangePolicyOptions

Return Type

• rangeOptions is RangePolicy

Defined in: packages/file-transfer/rangePolicy.ts:10

isRetryHandler

isRetryHandler(options: RetryPolicy | DefaultRetryPolicyOptions): options is RetryPolicy

Parameters

• options: RetryPolicy | DefaultRetryPolicyOptions

Return Type

• options is RetryPolicy

Defined in: packages/file-transfer/retry.ts:35

isValidator

isValidator(options: Validator | ChecksumValidatorOptions): options is Validator

Parameters

• options: Validator | ChecksumValidatorOptions

Return Type

• options is Validator

Defined in: packages/file-transfer/validator.ts:38

resolveProgressController

resolveProgressController(controller: ProgressController): ProgressController

Parameters

• controller: ProgressController

Return Type

• ProgressController

Defined in: packages/file-transfer/progress.ts:15

resolveRangePolicy

resolveRangePolicy(rangeOptions: RangePolicy | DefaultRangePolicyOptions): RangePolicy

Parameters

• rangeOptions: RangePolicy | DefaultRangePolicyOptions

Return Type

• RangePolicy

Defined in: packages/file-transfer/rangePolicy.ts:15

resolveRetryHandler

resolveRetryHandler(options: RetryPolicy | DefaultRetryPolicyOptions): RetryPolicy

Parameters

• options: RetryPolicy | DefaultRetryPolicyOptions

Return Type

• RetryPolicy

Defined in: packages/file-transfer/retry.ts:40

resolveValidator

resolveValidator(options: Validator | ChecksumValidatorOptions): Validator | undefined

Parameters

• options: Validator | ChecksumValidatorOptions

Return Type

• Validator | undefined

Defined in: packages/file-transfer/validator.ts:43