offliner

Offliner is a tool to make a website offline viewable. It's a concurrent web crawler which crawls a website and saves all the pages and static files in a directory.
It can use both, multi-processing & multi-threading as its concurrency model.

Features

• Serial scraping.
• Multi-threaded scraping.
• Multi-process scraping.
• Save static files (css, js, img).
• Edit the links on the pages to reference the local files.

Usage

You need to provide a full URL to start the scraping. You can use the defined flags to control the features. If you intend to use the multi-process form, the "process" program must exist in the same directory as the "offliner" program.

-h     show help.
-url   full URL of the start page.
-f     save static files too. It also edits the pages so the links reference the local files.
-a     use multi-processing instead of multi-threading as the concurrency model.
-n     maximum number of the pages to be saved. (default is 100)
-p     maximum number of the execution units (goroutines or processes) to run at the same time. (default is 50)
-s     run the scraper in a non-concurrent (serial) fashion.

Examples

Multi-threaded scraping. Save max 100 pages using max 90 goroutines. Save static files too.

./offliner -url=https://urmia.ac.ir -n=100 -p=90 -f

Multi-process scraping. Save max 100 pages using max 50 processes.

./offliner -url=https://urmia.ac.ir -n=100 -p=50 -a

Serial scraping. Save max 100 pages. Save static files too.

./offliner -url=https://urmia.ac.ir -n=100 -s -f

Todo

• Improve multi-processing design.
• Add a logger.
• Make the scraper a separate package (library).

License

GNU General Public License v3.0