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Capsule Host SDK

What's new?

  • v0.0.7: update with Wazero 1.4.0 + Redis 🐞 fix
  • v0.0.6: update with Wazero 1.3.0
  • v0.0.5: ✨ Helpers updated: CallOnStart and CallOnStop (they are executed from the same wasm module instance)
  • v0.0.4: ✨ Helpers added: CallOnStart and CallOnStop
  • v0.0.3: ✨ Wazero update 1.2.0
  • v0.0.2: ✨ Redis support
  • v0.0.1: 🎉 first release

What is the Capsule Host SDK alias Capsule HDK?

Capsule HDK is a SDK to develop Golang Host applications able to run WASM modules developped with the Capsule MDK (WASM Module SDK). A Capsule application is a WebAssembly Module(or Function) Runner.

The Capsule applications capsule-cli and capsule-http are both with this Capsule HDK: - capsule-cli, CLI. With capsule-cli, you can simply execute a WebAssembly Capsule module in a terminal - capsule-http, an HTTP server that serves WebAssembly Capsule modules

The Capsule Host SDK is developed in GoLang and uses the 💜 Wazero project.

Good to know

  • 🤗 a capsule application is "small" (capsule-http weighs 12M)
  • 🐳 a Capsule application is statically compiled: you can easily run it in a Distroless Docker container.

What are the added values of a Capsule application?

A Capsule application brings superpowers to the WASM Capsule modules with host functions. Thanks to these host functions, a WASM Capsule module can, for example, prints a message, reads files, writes to files, makes HTTP requests, ... See the host functions section.

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