move

Ownership and borrowing references

Please install the prerequisites first!

Quick start with Docker

$ docker run --rm --runtime=io.containerd.wasmedge.v1 --platform=wasi/wasm secondstate/rust-example-move:latest

Code

The src/main.rs source code shows

• When the hello string variable is passed into the take() function, it is no longer available outside of take().
• You can create a clone() of the hello string variable to pass to take(). This way, the original hello is still available outside of take().
• You can also pass a reference of the hello string to the borrow() function. Since the borrow() function only borrowed a reference of this variable, the original hello is still available outside of borrow().
  • The &string reference can be automatically cast to an immutable &str. So, the borrow() function can also take a &str as argument.

Step by step guide

Compile the Rust source code project to a Wasm bytecode file.

$ cargo build --target wasm32-wasi --release

Run the Wasm bytecode file in WasmEdge CLI.

$ wasmedge target/wasm32-wasi/release/move.wasm

Build and publish on Docker

The Dockerfile follows the above steps to build and package a lightweight OCI-compliant container image for the Wasm app. Now, we need to publish the container image to Docker Hub. The process is slightly different depending on how you plan to use the image.

For Docker Desktop and containerd

For containerd based systems, such as the Docker Desktop and many flavors of Kubernetes, you just need to specify that the WasmEdge application image is for the wasi/wasm platform.

$ docker buildx build --provenance=false --platform wasi/wasm -t secondstate/rust-example-move .
... ...
$ docker push secondstate/rust-example-move