m0ai/envoy-filter-using-wasm

WASM Based Envoy Filter Example

request 헤더에 포함된 x-username 을 확인하여 이를 response 본문에 추가하는 예제입니다.

Requirements

• Docker
• Taskfile
• Kustomize
• Go >= 1.9

Quick Start

terminal session 1

$ task build
task: [build] tinygo build -o main.wasm -scheduler=none -target=wasi ./main.go

$ file main.wasm
main.wasm: WebAssembly (wasm) binary module version 0x1 (MVP)

$ task run -w
task: [build] tinygo build -o main.wasm -scheduler=none -target=wasi ./main.go
task: [run] docker run -it --rm  ...

[2022-09-09 18:13:19.034][1][info][main] [source/server/server.cc:368] initializing epoch 0 (base id=0, hot restart version=11.120)
[2022-09-09 18:13:19.034][1][info][main] [source/server/server.cc:370] statically linked extensions

terminal session 2

$ curl localhost:18000 --data "Hello World"
Hello World, To Anonymous
~~~~
$ curl localhost:18000 --data "Hello World" -H "x-username: m0ai
Hello World, To m0ai

TODO

• Add Github Actions
  • build -> run -> test pipeline
  • test code ( test.main.go )
  • e2e test ( running on envoy container )
• Write Kubernetes Example
  • k8s/istio sidecar volume injection
  • Fetch WASM Code from remote (e.g envoyproxy/envoy#20287)

kubectl create ns test kubectl label namespace test istio-injection=enabled --overwrite kubectl create cm -n test wasm-filter --from-file=main.wasm