feat: Switch from Loki to something else

internal/context/context.go

@@ -23,7 +23,7 @@ type GlobalContext struct {
 	DefaultCSP   string
 	PagesDomain  string
 	Gitea        *gitea.GiteaClient
-	MetricConfig *metrics.LokiMetricConfig
+	MetricConfig *metrics.MetricConfig
 	Cache        *CacheContext
 }
 

internal/metrics/metrics.go

@@ -2,25 +2,22 @@ package metrics
 
 import (
 	"encoding/json"
-	"fmt"
-	"io/ioutil"
 	"net/http"
+	"os"
 	"regexp"
-	"strconv"
 	"strings"
-	"time"
 
 	log "github.com/sirupsen/logrus"
 )
 
-type LokiMetricConfig struct {
+type MetricConfig struct {
 	Url           string
 	BotUserAgents *[]regexp.Regexp
 	Enabled       bool
 }
 
 // Checks if we should send a metric ping to Loki based on the served path.
-func (c *LokiMetricConfig) ShouldSendMetrics(path, userAgent string) bool {
+func (c *MetricConfig) ShouldSendMetrics(path, userAgent string) bool {
 	if !strings.HasSuffix(path, ".html") || !c.Enabled {
 		return false
 	}
@@ -35,35 +32,21 @@ func (c *LokiMetricConfig) ShouldSendMetrics(path, userAgent string) bool {
 	return true
 }
 
-func (c *LokiMetricConfig) SendMetricPing(domain, path, referrer string) {
-	msg := fmt.Sprintf("path=\"%s\" referrer=\"%s\"", path, referrer)
-	data := map[string]interface{}{
-		"streams": []map[string]interface{}{
-			{
-				"stream": map[string]string{
-					// Labels
-					"service": "rio",
-					"domain":  domain,
-					"type":    "metric",
-				},
-				"values": [][]interface{}{
-					{
-						strconv.Itoa(int(time.Now().UnixNano())),
-						msg,
-					},
-				},
-			},
-		},
+func (c *MetricConfig) SendMetricPing(domain, path, referrer string) {
+	data := map[string]string{
+		"domain":  domain,
+		"path":    path,
+		"referer": referrer,
 	}
 	jsonData, err := json.Marshal(data)
 	if err != nil {
-		log.Errorf("Failed to send metric ping to Loki: %v", err)
+		log.Errorf("Failed to send metric ping: %v", err)
 		return
 	}
 
 	log.Debugf("Sending payload %s", string(jsonData))
 
-	// Send the ping to the Loki server
+	// Send the ping to the server
 	go func() {
 		res, err := http.Post(
 			c.Url,
@@ -71,19 +54,13 @@ func (c *LokiMetricConfig) SendMetricPing(domain, path, referrer string) {
 			strings.NewReader(string(jsonData)),
 		)
 		if err != nil {
-			log.Errorf("Failed to send payload to Loki: %v", err)
+			log.Errorf("Failed to send payload to: %v", err)
 			return
 		}
 
 		defer res.Body.Close()
-		if res.StatusCode != 204 {
-			log.Errorf("Loki returned non-204 status code %d", res.StatusCode)
-			body, err := ioutil.ReadAll(res.Body)
-			if err != nil {
-				log.Warnf("Failed to read body. No more specific error message")
-				return
-			}
-			log.Errorf("-> %s", body)
+		if res.StatusCode != 200 {
+			log.Errorf("Server returned non-200 status code %d", res.StatusCode)
 		}
 	}()
 }
@@ -91,7 +68,7 @@ func (c *LokiMetricConfig) SendMetricPing(domain, path, referrer string) {
 // Reads a JSON array of bot user agents from disk and parses them
 // into regular expressions.
 func ReadBotPatterns(file string) ([]regexp.Regexp, error) {
-	content, err := ioutil.ReadFile(file)
+	content, err := os.ReadFile(file)
 	if err != nil {
 		log.Warnf("Failed to read bot metrics file: %v", err)
 		return []regexp.Regexp{}, err

internal/metrics/metrics_test.go

@@ -6,7 +6,7 @@ import (
 )
 
 func TestShouldPing(t *testing.T) {
-	cfg := LokiMetricConfig{
+	cfg := MetricConfig{
 		Enabled: true,
 		Url:     "",
 		BotUserAgents: &[]regexp.Regexp{