scripttiger/abc

ABC is a package for Go which can act as either a standard HTTP sequential downloader supporting streaming playback while downloading for supported "Web" videos (with supported players, such as VLC, MPlayer, ffplay, MPC-HC, etc.) and resume capabilities or as an arbitrary byte collector to download only arbitrary portions of files by manipulating the HTTP Range header as needed. ABC can easily be imported into any Go project and be implemented as Go routines to download arbitrary portions of files concurrently. The reference implementation of ABC launches a single instance of ABC, but can also be easily scripted for concurrency.

ABC: Arbitrary Byte Collector

ABC is a package for Go which can act as either a standard HTTP sequential downloader supporting streaming playback while downloading for supported "Web" videos (with supported players, such as VLC, MPlayer, ffplay, MPC-HC, etc.) and resume capabilities or as an arbitrary byte collector to download only arbitrary portions of files by manipulating the HTTP Range header as needed. ABC can easily be imported into any Go project and be implemented as Go routines to download arbitrary portions of files concurrently. The reference implementation of ABC launches a single instance of ABC, but can also be easily scripted for concurrency.

To import ABC into your project:
go get github.com/ScriptTiger/abc
Then just import "github.com/ScriptTiger/abc" and call abc.Download(...) to use. Please refer to the reference implementation for more details on how to integrate ABC into your project.
https://github.com/ScriptTiger/abc/blob/main/ref/ref.go

Reference Implementation

Usage: abc [options...] <url> <file>

Argument	Description
-agent <user-agent>	Set User-Agent header
-i <URL>	Source URL
-retry <number>	Number of retries
-nodebug	Don't display debug messages, such as errors
-nokeep	If file already exists, delete and download new
-noprogress	Don't display progress
-o <file>	Destination file
-range <range>	Set Range header
-timeout <duration>	Set connection timeout

By default, if only a URL is given and no destination file, ABC will not download anything and just exit after returning any errors as well as the Content-Length and Accept-Ranges headers. If both the URL and destination file are given, without any additional arguments, ABC will either create a new destination file if it doesn't exist already, append to the existing destination file if it does exist but is not complete, or delete the existing file if it does exist but the server does not support resume capabilities and create a new file. ABC gives you both enough information as well as flexibility to either easily implement your own additional functionality in Go or via a scripted solution using the included reference implementation.

More About ScriptTiger

For more ScriptTiger scripts and goodies, check out ScriptTiger's GitHub Pages website:
https://scripttiger.github.io/