rio/internal/metrics/metrics.go
Alexander "PapaTutuWawa 315bb39f44
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feat: Pass around one big global context
2024-02-03 12:05:10 +01:00

117 lines
2.4 KiB
Go

package metrics
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"regexp"
"strconv"
"strings"
"time"
log "github.com/sirupsen/logrus"
)
type LokiMetricConfig 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 {
if !strings.HasSuffix(path, ".html") || !c.Enabled {
return false
}
// Filter out bots
for _, pattern := range *c.BotUserAgents {
if pattern.MatchString(userAgent) {
return false
}
}
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,
},
},
},
},
}
jsonData, err := json.Marshal(data)
if err != nil {
log.Errorf("Failed to send metric ping to Loki: %v", err)
return
}
log.Debugf("Sending payload %s", string(jsonData))
// Send the ping to the Loki server
go func() {
res, err := http.Post(
c.Url,
"application/json",
strings.NewReader(string(jsonData)),
)
if err != nil {
log.Errorf("Failed to send payload to Loki: %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)
}
}()
}
// 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)
if err != nil {
log.Warnf("Failed to read bot metrics file: %v", err)
return []regexp.Regexp{}, err
}
var payload []string
err = json.Unmarshal(content, &payload)
if err != nil {
log.Warnf("Failed to unmarshal file: %v", err)
return []regexp.Regexp{}, err
}
patterns := make([]regexp.Regexp, 0)
for _, v := range payload {
patterns = append(
patterns,
*regexp.MustCompile(v),
)
}
return patterns, nil
}