I was pleased to discover that Google provides a non-Node.JS mechanism to subscribe to and act upon Firestore triggers, Google Cloud Firestore Triggers. I’ve nothing against Node.JS but, for the project i’m developing, everything else is written in Golang. It’s good to keep it all in one language.

I’m perplexed that Cloud Functions still (!) only supports Go 1.13 (03-Sep-2019). Even Go 1.14 (25-Feb-2020) was released pre-pandemic and we’re now running on 1.16. Come on Google!

Let’s see if this works!?

I’ve added the following link to this site’s baseof.html so that it is now rendered for each page:

<link
  href="https://us-central1-webmention.cloudfunctions.net/webmention"
  rel="webmention" />

I discovered indieweb yesterday reading about webmention. Who knows what got me to webmention!?

The principles of both are sound. Instead of relying on come-go behemoths to run our digital world, indieweb seeks to provide technologies that enable us to achieve things without them. webmention is a cross-walled-garden mechanism to perform an evolved form of pingbacks. If X references one of Y’s posts, X’s server notifies Y’s server during publication through a webmention service and, Y can then decide to add reference counts of copies of the referring link to their page. Clever.

Following on from waPC & Protobufs and a question on Stack Overflow about Cloud Functions, I was compelled to try running WASM on Cloud Functions no JavaScript.

I wanted to reuse the WASM waPC functions that I’d written in Rust as described in the other post. Cloud Functions does not (yet!?) provide a Rust runtime and so I’m using the waPC Host for Go in this example.

It works!

PARAMS=$(printf '{"a":{"real":39,"imag":3},"b":{"real":39,"imag":3}}' | base64)
TOKEN=$(gcloud auth print-identity-token)

echo "{
	\"filename\":\"complex.wasm\",
	\"function\":\"c:mul\",
	\"params\":\"${PARAMS}\"
}" |\
curl \
--silent \
--request POST \
--header "Content-Type: application/json" \
--header "Authorization: Bearer ${TOKEN}" \
--data @- \
https://${REGION}-${PROJECT}.cloudfunctions.net/invoker

yields (correctly):