Sat, the tiny WebAssembly compute module
Sat (as in satellite) is an experiment, and isn't ready for production use. Please try it out and give feedback!
Sat is a compute module designed to have the maximum performance and smallest possible footprint. Where our Atmo project is a fully-fledged platform with support for running entire applications, Sat takes the opposite approach: run a single module really f***ing fast.
Sat has no dependencies (it's statically compiled), and can run in a tiny Docker container (Alpine). It's meant to live in small places such as edge compute instances.
Using Sat
To run Sat, Docker is easiest. Clone this repo and run:
make docker run
This will build the suborbital/sat:dev Docker image and then launch it using the hello-echo.wasm module found in the testmodule directory.
You can then make a POST request to localhost:8080 with a body, and that body will be echoed back to you.
Sat executes modules with the Runnable API enabled, so you can create modules using our Subo CLI and all of the capabilities are available for use.
Note that statically compiling Sat on macOS is not currently possible, so it is Linux-only for now.
Stdin mode
As an alternative to running Sat as a server, you can also use it in stdin mode. First, build Sat:
make sat
OR
make sat/dynamic #on macOS
Then, run Sat with an input on stdin:
echo "world" | .bin/sat --stdin ./testmodule/hello-echo.wasm
Sat will write the response to stdout and exit.
Run from URL
If you provide a URL as the path argument to Sat, it will download the module from that URL, write it to a temp directory, and use it for execution:
sat "https://github.com/suborbital/reactr/blob/main/rwasm/testdata/hello-echo/hello-echo.wasm?raw=true"
The URL must be HTTPS and must have a .wasm suffix (excluding query parameters)
One day...
Sat has the ability to create a mesh with other instances using local network discovery and websockets. By default, Sat starts on a random port, and listens for requests from its peers. In the future, this will enable some very interesting network topologies and potentially an integration with Atmo, but for now we are focused on being tiny and fast.
Copyright Suborbital contributors 2021.
