Running your WebAssembly component as a microservice

Use wasmflow to turn any WebAssembly module into a standalone microservice.

To turn any WebAssembly module or manifest into a microservice, change the command you use with wasmflow from invoke to serve and pass the --rpc flag to enable the GRPC service. You can supply a custom port with --rpc-port

If you’re following the guide, you can use your own WebAssembly module in place of

$ wasmflow serve --rpc --rpc-port 8060
2022-06-20T22:16:51  INFO GRPC server bound to on port 8060
2022-06-20T22:16:51  INFO Waiting for ctrl-C
2022-06-20T22:16:51  INFO Starting RPC server

Running wasmflow serve without providing a --port argument will cause wasmflow to automatically select a random, unused port.

Testing your microservice with wafl

wafl is the Wasmflow utility binary that can speak the Wasmflow RPC protocol (among other things).

Using a different terminal and the port from above, run wafl rpc invoke to make the same request we made in the last step.

$ wafl rpc invoke --port=8060 concatenate -- --left=Hello --right=World
{"output":{"value":"Hello World"}}

Congratulations, you just got a command line tool and a streaming GRPC microservice in one!

Next we’re going to connect some components and see how we can start building large projects out of small ones. Next: Flows