load-module-in-module

Function Dependecies between Wasm Modules

This example demonstrates the function dependencies between different wasm modules. That is, a wasm function defined in one wasm module can be called by another wasm module.

This example consists of three projects:

• alice-wasm-lib is a wasm library, in which a function named add is defined.

• bob-wasm-lib is a wasm library, in which a function named real_add is defined. This function is called by the function add defined in alice-wasm-lib.

• host-app is a host application that loads the wasm binaries generated from alice-wasm-lib and bob-wasm-lib, and runs the wasm function add exported by alice over WasmEdge Runtime.

Now let's build and run this example.

• Install rustup and Rust

  Go to the official Rust webpage and follow the instructions to install rustup and Rust.

  It is recommended to use Rust 1.71 or above in the stable channel.

  Then, add wasm32-wasi target to the Rustup toolchain:

  rustup target add wasm32-wasi

• Install WasmEdge Runtime

  Refer to the Quick Install section of WasmEdge Runtime Book to install WasmEdge Runtime. Or, use the following command directly

  # NOTICE that the installation script needs `sudo` access
  
  # install wasmedge to the directory /usr/local/
  curl -sSf https://raw.githubusercontent.com/WasmEdge/WasmEdge/master/utils/install.sh | bash -s -- -v 0.14.0
  source $HOME/.wasmedge/env

  For users in China mainland (中国大陆地区), try the following command to install WasmEdge Runtime if failed to run the command above

  # NOTICE that the installation script needs `sudo` access
  
  bash install_zh.sh -v 0.14.0
  source $HOME/.wasmedge/env

• Download example

  git clone git@github.com:second-state/wasmedge-rustsdk-examples.git
  cd wasmedge-rustsdk-examples/load-module-in-module

• Build alice-wasm-lib

  cargo build -p alice-wasm-lib --target wasm32-wasi --release

  If the command runs successfully, alice-wasm-lib.wasm can be found in the directory of ../target/wasm32-wasi/release/.

• Build bob-wasm-lib

  cargo build -p bob-wasm-lib --target wasm32-wasi --release

  If the command runs successfully, bob-wasm-lib.wasm can be found in the directory of ../target/wasm32-wasi/release/.

• Build and run multi-module-host-app

  cargo run -p multi-module-host-app -- 2 3

  If the command runs successfully, then the following message is printed out on the screen:

  args: ["target/debug/multi-module-host-app", "2", "3"]
  add(2, 3) = 5