54 lines
1.1 KiB
Go
54 lines
1.1 KiB
Go
package main
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import (
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"encoding/json"
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"io/ioutil"
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"net/http"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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"within.website/ln"
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)
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var (
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readTimes = prometheus.NewHistogramVec(prometheus.HistogramOpts{
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Name: "blogpage_read_times",
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Help: "This tracks how much time people spend reading articles on my blog",
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}, []string{"path"})
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)
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func init() {
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_ = prometheus.Register(readTimes)
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}
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func handlePageViewTimer(w http.ResponseWriter, r *http.Request) {
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if r.Header.Get("DNT") == "1" {
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http.NotFound(w, r)
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return
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}
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data, err := ioutil.ReadAll(r.Body)
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if err != nil {
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ln.Error(r.Context(), err, ln.Info("while reading data"))
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http.Error(w, "oopsie whoopsie uwu", http.StatusInternalServerError)
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return
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}
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r.Body.Close()
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type metricsData struct {
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Path string `json:"path"`
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StartTime time.Time `json:"start_time"`
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EndTime time.Time `json:"end_time"`
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}
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var md metricsData
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err = json.Unmarshal(data, &md)
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if err != nil {
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http.NotFound(w, r)
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return
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}
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diff := md.EndTime.Sub(md.StartTime).Seconds()
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readTimes.WithLabelValues(md.Path).Observe(float64(diff))
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}
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