Track your weight with a CGI script and Go
Capturing datapoints, adding them to a time series, and showing values over time graphically is usually the domain of tools like Prometheus. The tool retrieves the status of monitored systems at regular intervals and stores the data as a time series. If outliers occur, the messenger of the gods alerts its human to the fact. Viewing tools such as Grafana display the collected time series in dashboards spread over the last week or year as graphs, if so desired, so that even senior managers can see at a glance what's going on in the trenches.
However, my el cheapo web host won't let me install arbitrary software packages for this purpose on my rented virtual server. Plus, maintaining such complicated products with their continuous updates would be too time consuming for me, anyway. However, there is a '90s-style CGI interface on the web server. How hard could it be to write a CGI program in Go that receives measured values via HTTPS like an API, formats the time series generated from them into an attractive chart, and sends the results back to the browser in PNG format? Let's find out.
Figure 1 shows the graph of a time series that outputs my weight in kilograms over the past few years (possibly embellished for this article) as a chart in the browser after pointing it to the URL on the server. The same CGI script also accepts new incoming data. For example, if my scale shows 82.5 kilograms one day, calling
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