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Wasmer logo

Build Status License Join the Wasmer Community

Introduction

Wasmer is a Standalone JIT WebAssembly runtime, aiming to be fully compatible with Emscripten, Rust and Go.

Install Wasmer with:

curl https://get.wasmer.io -sSfL | sh

NEW : Now you can also embed Wasmer in your Rust application, check our example repo to see how to do it!

Usage

wasmer can execute both the standard binary format (.wasm) and the text format defined by the WebAssembly reference interpreter (.wat).

Once installed, you will be able to run any WebAssembly files (including Nginx, and Lua!):

# Run Lua
wasmer run examples/lua.wasm

# Run Nginx
wasmer run examples/nginx/nginx.wasm -- -p examples/nginx -c nginx.conf

Code Structure

Wasmer is structured into different directories:

  • src: code related to the wasmer excutable binary itself
  • lib: modularized libraries that Wasmer uses under the hood
  • examples: some useful examples to getting started with wasmer

Dependencies

Building wasmer requires rustup.

To install on Windows, download and run rustup-init.exe then follow the onscreen instructions.

To install on other systems, run:

curl https://sh.rustup.rs -sSf | sh

Other dependencies

Please select your operating system:

macOS

If you have homebrew installed:

brew install cmake

Or, in case you have ports:

sudo port install cmake

Debian-based Linuxes

sudo apt install cmake

Windows (MSVC)

Right now Windows support is highly experimental. We are working on this so Wasmer can soon be released for Windows.

  1. Install Python for Windows (https://www.python.org/downloads/release/python-2714/). The Windows x86-64 MSI installer is fine. You should change the installation to install the "Add python.exe to Path" feature.

  2. Install Git for Windows (https://git-scm.com/download/win). DO allow it to add git.exe to the PATH (default settings for the installer are fine).

Building

Wasmer is built with Cargo, the Rust package manager.

# checkout code
git clone https://github.com/wasmerio/wasmer.git
cd wasmer

# install tools
# make sure that `python` is accessible.
cargo install --path .

Testing

Thanks to spectests we can assure 100% compatibility with the WebAssembly spec test suite.

Tests can be run with:

make test

If you need to re-generate the Rust tests from the spectests you can run:

make spectests

You can also run integration tests with:

make integration-tests

Roadmap

Wasmer is an open project guided by strong principles, aiming to be modular, flexible and fast. It is open to the community to help set its direction.

Below are some of the goals (written with order) of this project:

  • It should be 100% compatible with the WebAssembly Spectest
  • It should be fast (partially achieved)
  • Support Emscripten calls (in the works)
  • Support Rust ABI calls
  • Support GO ABI calls

Architecture

If you would like to know how Wasmer works under the hood, please visit our ARCHITECTURE document.

License

MIT/Apache-2.0

Attributions.