Getting started

Fork this project to create your own Rust functions as a web service.

How it works

• The Rust function source code is in the src/lib.rs file.
• Use the rustwasmc tool to compile the Rust function into a WebAssembly module in the pkg directory.
• Optional: Use the node node/app.js command to test the function locally in Node.js.
• Upload the pkg/*.wasm file to the Second State FaaS service, OR to a Node.js server, to turn it into a web service.

This is the Docker edition. Check out the Github Codespaces edition here.

Docker

Build the WebAssembly module.

$ docker pull secondstate/wasmedge-nodejs-starter
$ docker run -p 3000:3000 --rm -it -v $(pwd):/app secondstate/wasmedge-nodejs-starter
(docker) # cd /app
(docker) # rustwasmc build

Option 1: Upload to the FaaS and test

Upload the wasm file in the pkg folder to the FaaS. Double check the .wasm file name before you upload.

(docker) # curl --location --request POST 'https://rpc.ssvm.secondstate.io:8081/api/executables' \
--header 'Content-Type: application/octet-stream' \
--header 'SSVM-Description: say hello' \
--data-binary '@pkg/hello_lib_bg.wasm'

The FaaS returns

{"wasm_id":161,"wasm_sha256":"0xfb413547a8aba56d0349603a7989e269f3846245e51804932b3e02bc0be4b665","usage_key":"00000000-0000-0000-0000-000000000000","admin_key":"00xxxxxx-xxxx-xxxx-xxxx-4adc960fd2b8"}

Make a function call via the web.

(docker) # curl --location --request POST 'https://rpc.ssvm.secondstate.io:8081/api/run/161/say' \
--header 'Content-Type: text/plain' \
--data-raw 'Second State FaaS'
hello Second State FaaS

You can easily incorporate this web service into your HTML web pages. See how

Option 2: Local test and debug

From the first terminal window, start the Node.js application.

(docker) # node node/app.js

From a second terminal window, you can test the local server.

$ curl http://localhost:3000/?name=WasmEdge
hello WasmEdge

More exercises

Now, you can copy and paste code from this project.

• src/lib.rs --> Replace with code here

• Cargo.toml --> Replace with code here

• node/app.js --> Replace with code here

• FaaS deployment: https://github.com/second-state/wasm-learning/tree/master/faas

• Node.js deployment: https://github.com/second-state/wasm-learning/tree/master/nodejs

Read more:

• Tutorials for FaaS
  • Getting started with FaaS in Rust
  • Use Binary Data as Function Input and Output
  • Mixing Text and Binary Data in Call Arguments
  • Internet of Functions: webhooks
  • AI as A Service on WebAssembly
• Tutorials for Node.js micro-services
  • The Case for WebAssembly on the Server-side
  • Getting started on Rust and WebAssembly for server-side apps
  • Passing function arguments in JSON
  • Use Tensorflow and AI models from WebAssembly

Resources

• The WasmEdge Runtime is a high performance WebAssembly virtual machine designed for edge computing (including Edge Cloud) applications.
• The rustwasmc is a toolchain for compiling Rust programs into WebAssembly, and then make them accessible from JavaScripts via the WasmEdge Runtime.
• The Second State FaaS is an open source FaaS engine based on WebAssembly and Node.js.

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