support --platform=wasip1/wasm

[imjasonh]

In order to use this, you need:

• Go 1.21
• up-to-date Docker Desktop with experimental features enabled

go run ./ build ./test --platform wasip1/wasm

When run this way, instead of producing /ko-app/test, it produces /ko-app/test.wasm on top of an empty base image.

You can run this image with:

docker run \                                         
  --runtime=io.containerd.wasmedge.v1 \
  --platform=wasip1/wasm \
  ${IMAGE}

Or, all together in one big blob:

$ docker run \                                         
  --runtime=io.containerd.wasmedge.v1 \
  --platform=wasip1/wasm \
  $(KO_DOCKER_REPO=ttl.sh/jason KO_GO_PATH=go1.21rc2 go run ./ build ./test --platform wasip1/wasm) --wait=false
...
Unable to find image 'ttl.sh/jason/test-46c4b272b3716c422d5ff6dfc7547fa9@sha256:a0c4ec41385b5739a22e2557d374298938dea07385d6cf4c1d2e09931df7c7de' locally
a0c4ec41385b: Download complete 
d37e65aa4221: Download complete 
3827f8e0b338: Download complete 
2023/07/14 00:22:01 version = default
2023/07/14 00:22:01 Hello, adventurous wasm user!

Known issues:

• go version -m test.wasm doesn't work, so the SBOM is empty
• --platform=linux/amd64,wasip1/wasm doesn't work, and it's unclear if anything could run it anyway

[codecov-commenter]

Codecov Report

Merging #1095 (278c337) into main (77c116b) will decrease coverage by 0.26%.
The diff coverage is 0.00%.

❗ Your organization is not using the GitHub App Integration. As a result you may experience degraded service beginning May 15th. Please install the Github App Integration for your organization. Read more.

@@            Coverage Diff             @@
##             main    #1095      +/-   ##
==========================================
- Coverage   49.23%   48.97%   -0.26%     
==========================================
  Files          44       44              
  Lines        3650     3669      +19     
==========================================
  Hits         1797     1797              
- Misses       1621     1639      +18     
- Partials      232      233       +1     

Files Changed	Coverage Δ
pkg/build/gobuild.go	56.06% <0.00%> (-1.23%)	⬇️

[imjasonh]

Spin

$ docker run \
  --runtime=io.containerd.spin.v1 \    
  --platform=wasip1/wasm \
  ${IMAGE} --wait=false
...
docker: Error response from daemon: Cannot read spin.toml manifest from "/var/run/desktop-containerd/daemon/io.containerd.runtime.v2.task/moby/1560897a091b6698b942f477ac782110df9c31364ea8d6733ddfd937ade3b6ce/rootfs/spin.toml": unknown.
ERRO[0000] error waiting for container: context canceled 

💥

Slight

$ docker run \
  --runtime=io.containerd.spin.v1 \    
  --platform=wasip1/wasm \
  ${IMAGE} --wait=false

(no output 😶 )

Wasmtime

$ docker run \
  --runtime=io.containerd.wasmtime.v1 \    
  --platform=wasip1/wasm \
  ${IMAGE} --wait=false
2023/07/14 00:42:10 version = default
2023/07/14 00:42:10 Hello, adventurous wasm user!

🎉

[shivaylamba]

This is really awesome work!

[sonatard]

Great!! This wasm image can run on Cloud run?

[imjasonh]

Great!! This wasm image can run on Cloud run?

I don't believe so, at least not yet.

Luckily Cloud Run has great support for regular containers, so I don't think there's any real benefit to using wasm.

[BobyMCbobs]

This'd be pretty awesome for building wasm to use with Istio+Envoy!
I can see a powerful use case there to speed up development.

[imjasonh]

This'd be pretty awesome for building wasm to use with Istio+Envoy!
I can see a powerful use case there to speed up development.

Yeah that sounds like a good use case. Do you have any docs about the current development process, that I could try to replicate with this change?

[BobyMCbobs]

This'd be pretty awesome for building wasm to use with Istio+Envoy!
I can see a powerful use case there to speed up development.

Yeah that sounds like a good use case. Do you have any docs about the current development process, that I could try to replicate with this change?

This is how I've built WASM for use with Envoy
https://github.com/ii/registry.k8s.io/tree/master/envoy-wasm

for putting together an Envoy-compatible WASM public, I've used this package
https://github.com/tetratelabs/proxy-wasm-go-sdk
then once it's built and pushed as an OCI image, it can be picked up here
https://istio.io/latest/docs/reference/config/proxy_extensions/wasm-plugin/

Let me know if I can help in any way

not as useful but for C++ https://github.com/istio-ecosystem/wasm-extensions

[github-actions]

This Pull Request is stale because it has been open for 90 days with
no activity. It will automatically close after 30 more days of
inactivity. Keep fresh with the 'lifecycle/frozen' label.

[BobyMCbobs]

@imjasonh, thank you for the efforts so far. Is there any plan to eventually get this PR merged? Cheers