Dana Woodman danawoodman

Using Golang templ with the Echo framework

templ is a great view framework but there is no clear documentation (as of writing) showing how to use it with the Echo web framework. This short guide should show you how to set it up:

Install dependencies

Install templ and echo:

go get github.com/a-h/templ

How to build a Golang application for a Raspberry Pi

Given a binary at cmd/server/main.go, create a binary at bin/server that is built for a Raspberry Pi:

env GOOS=linux GOARCH=arm GOARM=5 go build -o ./bin/server ./cmd/server/main.go

Allow photo album AND the camera

On Android devices, if you want to create a file input that prompts the user to either choose an image from their photo album or take a picture with their camera, you'll need this basically undocumented capture attribute added to your input's accept property:

<input type="file" accept="image/*;capture=camera" />

Serving embedded static files with Echo (Golang)

For a project I'm working on, I need to ship a single server binary with all static files embedded and use that for the frontend of the server. The backend has a variety of routes which the frontend calls.

The frontend is a SvelteKit static app built to ./frontend/build. Here is the Echo configuration to get these files serving at the root of the web server:

Setup a system service for the RaspberryPi

If you want to run your own app on a Debian system, like a RaspberryPi, you'll need to build the binary for the given device then setup systemd to run the binary.

Given you have an app called myapp, first create a service file to run your app, say at myapp.service on your local system:

[Unit]
Description=Some description here...
After=network.target

Start a web page in kiosk mode on a Raspberry Pi

Install dependencies

Start by installing chromium and unclutter which will hide the cursor on the screen:

sudo apt install -y -no-install-recommends chromium-browser unclutter

Release golang apps using Github Actions

Want to release a new binary on Github for every new git tag (e.g. v1.2.7)? Here is a simple Github Actions yaml config file that should get you started.

This script will automatically checkout your code, setup the correct version of go as defined in your go.mod file and build your go binary (in this case using a Makefile default target), then upload it to a new Github Release.

# .github/workflows/release.yml
name: Build and release Go Project

Deploying Cloudflare Workers via Cloudflare Pages in a Turborepo monorepo

Whew, what a mouthful.

Cloudflare Workers is an excellent platform for deploying a variety of applications but it has some limitations compared to Cloudflare's other product, Pages.

Pages gives you git integration which gives you auto-deploying via git push as well as pull request preview deployment links so you can test out features before pushing to production.

However, it's not super clear how to deploy a bare worker to Cloudflare Pages as Pages is more tailored right now for apps (SvelteKit, Astro, Next, etc), that is why I wrote up this little guide.

	<script lang="ts">
	export let label: string
	export let type: string = "text"
	export let value: string = ""
	export let disabled: boolean = false
	export let validate: (val: string) => boolean
	export let valid: boolean = false

	let id = `field-${Math.floor(Math.random() * 1000)}`

	await run();

	async function run() {
	let loop = 0;

	while (true) {
	loop++;
	console.log("loop:", loop);
	const items = get_items();
	if (!items.length) break;