CommandBox : CLI, Package Manager, REPL & More
4.5.0
4.5.0
  • Introduction
  • About This Book
  • Authors
  • Overview
  • Getting Started Guide
  • Setup
    • Requirements
    • Download
    • Installation
    • Non-Oracle JREs
    • Upgrading
    • Common Errors
  • Usage
    • Execution
      • Recipes
      • CFML Files
        • Using a DB in CFML scripts
      • OS Binaries
      • CFML Functions
      • Exit Codes
    • Commands
    • Parameters
      • Escaping Special Characters
      • File Paths
      • Globbing Patterns
      • Piping into Commands
      • Expressions
    • Command Help
    • Environment Variables
    • System Settings
    • Ad-hoc Command Aliases
    • Default Command Parameters
    • REPL
    • Tab Completion
    • Interactive Shell Features
    • forEach Command
    • Auto Update Checks
    • Bullet Train Prompt
    • 256 Color Support
    • A Little Fun
  • IDE Integrations
    • Sublime Text
    • Visual Studio Code
  • Config Settings
    • Module Settings
    • Proxy Settings
    • Endpoint Settings
    • Server Settings
    • Misc Settings
  • Embedded Server
    • Multi-Engine Support
    • Offline Server Starts
    • Debugging Server Starts
    • Server Processes
    • Manage Servers
    • FusionReactor
    • Server Logs
    • Configuring Your Server
      • JVM Args
      • Server Port and Host
      • URL Rewrites
      • Aliases
      • Custom Error Pages
      • Welcome Files
      • Basic Authentication
      • Custom Java Version
      • Adding Custom Libs
      • GZip Compression
      • REST Servlet
    • Starting as a Service
    • Server.json
      • Working with server.json
      • Packaging Your Server
      • Using Multiple server.json Files
  • Package Management
    • Installing Packages
      • Installation Path
      • Installation Options
      • Advanced Installation
    • Private Packages
    • System Modules
    • Code Endpoints
      • ForgeBox
      • HTTP(S)
      • File
      • Folder
      • Git
      • Java
      • S3
      • CFLib
      • RIAForge
      • Jar (via HTTP)
      • Gist
    • Package Scripts
    • Dependencies
    • Updating Packages
    • Creating Packages
      • Editing Package Properties
      • Publishing Lucee Extensions to ForgeBox
    • Artifacts
    • Box.json
      • Basic Package Data
      • Extended Package Data
      • Package URLs
      • Installation
      • Embedded Server
      • Dependencies
      • TestBox
    • Managing Version
  • Task Runners
    • Task Anatomy
    • Task Target Dependencies
    • Passing Parameters
    • Using Parameters
    • Task Output
    • Task Interactivity
    • Shell Integration
    • Downloading Files
    • Running Other Commands
    • Error Handling
    • Hitting Your Database
    • Interactive Jobs
    • Watchers
    • Property Files
    • Running other Tasks
    • Loading Ad hoc Jars
    • Loading Ad-hoc Modules
    • Cancel Long Tasks
    • Progress Bar
  • Helpful Commands
    • Token Replacements
    • Checksums
    • Code Quality Tools
  • Deploying CommandBox
    • Docker
    • Heroku
  • TestBox Integration
    • Test Runner
    • Test Watcher
  • Developing For CommandBox
    • Modules
      • Installation and Locations
      • Configuration
        • Public Properties
        • Configure() Method
        • Lifecycle Methods
      • Conventions
      • User Settings
      • Linking Modules
    • Commands
      • Aliases
      • Using Parameters
        • Using File Globs
        • Dynamic Parameters
      • Command Output
      • Tab Completion & Help
      • Interactivity
      • Watchers
      • Shell integration
      • Running Other Commands
      • Error handling
      • Watchers
      • Loading Ad hoc Jars
    • Interceptors
      • Core Interception Points
        • CLI Lifecycle
        • Command Execution Lifecycle
        • Module Lifecycle
        • Server Lifecycle
        • Error Handling
        • Package Lifecycle
      • Custom Interception Points
    • Injection DSL
    • Example Project
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  1. Task Runners

Downloading Files

PreviousShell IntegrationNextRunning Other Commands

Last updated 6 years ago

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When you need to download a file from HTTP(S) in a Task Runner, you'll want to use our progressable downloader helper. It has several advantages over a basic HTTP call:

  • Automatically uses any configured proxy settings

  • Doesn't lock the CLI during download but shows a handy progress bar to the user.

  • Can be interrupted with Ctrl-C for very large downloads that the user wants to cancel.

If the remote server doesn't send a content length header (like S3 cloudfront) then instead of a progress bar, you'll just see a climbing file size that shows how much as been downloaded so far.

To use the progressable downloader, ask WireBox to inject the following two CFC instances into your Task Runner:

property name="progressableDownloader" 	inject="ProgressableDownloader";
property name="progressBar" 			inject="ProgressBar";

Then, when you're ready to download, use them like so:

var result = progressableDownloader.download(
	'http://site.com/fileToDownload.zip',
	'C:/path/to/fileWeDownloaded.zip',
	// This callback fires every 1024K of downloaded bytes
	function( status ) {
		progressBar.update( argumentCollection = status );
	}
);

That will download the file and place it in the local path. The closure is a callback that updates the progress bar as the file downloads. It is decoupled this way so you could make your own progress bar if you wanted.

The result variable contains the following struct.

{
	responseCode,
	responseMessage,
	headers // struct
}

An error will be thrown if the status code is less than 200 or greater than 399. The progressable downloader will follow 301 and 302 redirects automatically. If you want to track this, you can add an additional listener closure which is called for every redirect.

progressableDownloader.download(
	downloadURL,
	localPath,
	function( status ) {
		progressBar.update( argumentCollection = status );
	},
	function( newURL ) {
		print.line( "Redirecting to: '#arguments.newURL#'..." );
	}
);