The flipping image example

In this example, we demonstrate how to create and run a Rust function in the Second State Rust FaaS.

Prerequisites

If you have not done so already, follow these simple instructions to install Rust and ssvmup.

Build the WASM bytecode

ssvmup build

FaaS

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

curl --location --request POST 'https://rpc.ssvm.secondstate.io:8081/api/executables' \
--header 'Content-Type: application/octet-stream' \
--header 'SSVM-Description: brighten' \
--data-binary '@pkg/thumbnail_lib_bg.wasm'

Returns

{"wasm_id":274,"wasm_sha256":"0x0911713ed4754886166afc52e1aff20a4bc53b1239f18ed6538207fc03da0dee","SSVM_Usage_Key":"00000000-0000-0000-0000-000000000000","SSVM_Admin_Key":"x9576x32-2aab-48c6-a537-e6f1aea4fx1d"}

Note: You can update this binary with the SSVM_Admin_Key.

$ curl --location --request PUT 'https://rpc.ssvm.secondstate.io:8081/api/update_wasm_binary/274' \
--header 'Content-Type: application/octet-stream' \
--header 'SSVM_Admin_Key: x9576x32-2aab-48c6-a537-e6f1aea4fx1d' \
--data-binary '@pkg/thumbnail_lib_bg.wasm'

Call the Function

curl --location --request POST 'https://rpc.ssvm.secondstate.io:8081/api/multipart/run/274/thumbnail/bytes' \
--header 'Content-Type: multipart/form-data' \
--form 'input_1=@html/surf.png' \
--output tmp.png

Serverless web app

Open web page html/index.html in any browser. See a static demo.