SlingShot

How to run serverless applications augmented by Wasm

SlingShot is a Wasm runner to run or serve Extism Wasm plug-ins.

Run a wasm plug-in:

./slingshot run --wasm=./hello.wasm --handler=hello --input="Bob 🤓"

Serve a wasm plug-in as a function:

./slingshot listen --wasm=./hello.wasm --handler=handle --http-port=7070

Trigger a wasm plug-in with Redis messages:

./slingshot redis subscribe --wasm=./hello.wasm --handler=message \
--uri=${REDIS_URI} \
--client-id=007 \
--channel=news

Trigger a wasm plug-in with NATS messages (✋ experimental 🚧 WIP):

./slingshot nats subscribe --wasm=./hello.wasm --handler=message \
--url=${NATS_SERVER_URL} \
--connection-id=007 \
--subject=news

Execute a remote wasm file:

./slingshot run \
--wasm-url="http://0.0.0.0:9000/print.wasm" \
--wasm=./print.wasm \
--handler=callHandler \
--input="🤓 I'm a geek"

Run Slingshot with Docker (multi arch image 🐳):

HTTP_PORT=8080
docker run \
    -p ${HTTP_PORT}:${HTTP_PORT} \
    -v $(pwd)/hello-service:/app --rm botsgarden/slingshot:0.0.5 \
    /slingshot start \
    --wasm=./app/hello.wasm \
    --handler=callHandler \
    --http-port=${HTTP_PORT} 

How is Slingshot developed?

Slingshot is developed in Go with Wazero¹ as the Wasm runtime and Extism², which offers a Wazero-based Go SDK and a Wasm plugin system.

Install SlingShot

• Download the latest release of SlingShot: https://github.com/bots-garden/slingshot/releases for your machine and OS.
• Rename it to slingshot
• Check by typing: ./slingshot version

Footnotes

1. Wazero is a project from Tetrate ↩

2. Extism is a project from Dylibso ↩