extism-fsnotify

filesystem-extism-demo_720p.mp4

Use the filesystem as a computing environment.

make build-plugins # requires Rust toolchain
make run # requires Go toolchain

Demo: construct programmable directories on your filesystem.

• plugins/invert: invert the colors of a PNG file

  • add a new PNG to the directory containing this .wasm plug-in
  • see new PNG replacing the original with inverted colors

• plugins/md2html: convert Markdown in to HTML files

  • add a Markdown file to the directory containing this .wasm plug-in
  • see a new HTML file generated next to the Markdown file

The host program runs a recursive watcher, to build the initial structure, and all new directories with files + .wasm are watched and computed.

For each file create operation, the .wasm is loaded and passed the file that triggered the event.

This program treats a directory, a written file, and a single .wasm module as the unit of computation.

Data types

1. Host -> Plug-in

{
  "event_file_name": "path/to/file.md",
  "event_file_data": "<base64 encoded file>"
}

2. Plug-in -> Host

{
  "op": "create",
  "output_file_name": "path/to/file.md",
  "output_file_data": "<base64 encoded file>"
}