[core] Clean IPs from socket errors

in order not to log IPs (GDPR) and also to prevent spread of errors in
Sentry logging as IP/Port combinations are unique per connection and
therefore will spam with many unique errors. By removing the unique
information from the error the errors should be groupable again.

Signed-off-by: Knut Ahlers <knut@ahlers.me>

internal/helpers/helpers.go

@@ -0,0 +1,2 @@
+// Package helpers contains helpers to assist in other parts of the code
+package helpers

internal/helpers/operr.go

@@ -0,0 +1,35 @@
+package helpers
+
+import (
+	"errors"
+	"net"
+	"regexp"
+)
+
+// CleanOpError checks whether a *net.OpError is included in the error
+// and if so removes the included address information. This can happen
+// in two ways: If the passed error is indeed an OpError the address
+// info is just patched out. If the OpError is buried deeper inside
+// the wrapped error stack, a new error with patched message is created
+// sacrificing the wrapping and possible included stacktrace.
+//
+// As of the loss of information this is only intended to clean up
+// logging and not be used in error returns.
+func CleanOpError(err error) error {
+	if opE, ok := err.(*net.OpError); ok {
+		// Error in the outmost position is an OpError, lets just patch it
+		opE.Source = nil
+		opE.Addr = nil
+		return opE
+	}
+
+	var opE *net.OpError
+	if !errors.As(err, &opE) {
+		// There is no OpError somewhere inside, keep the error as is
+		return err
+	}
+
+	// Patch out IP information and create an new error with its message
+	return errors.New(regexp.MustCompile(` (?:(?:[0-9]+\.){3}[0-9]+:[0-9]+(?:->)?)+`).
+		ReplaceAllString(err.Error(), ""))
+}

main.go

@@ -20,6 +20,7 @@ import (
 
 	"github.com/Luzifer/go_helpers/v2/str"
 	"github.com/Luzifer/rconfig/v2"
+	"github.com/Luzifer/twitch-bot/v3/internal/helpers"
 	"github.com/Luzifer/twitch-bot/v3/internal/service/access"
 	"github.com/Luzifer/twitch-bot/v3/internal/service/timer"
 	"github.com/Luzifer/twitch-bot/v3/pkg/database"
@@ -281,13 +282,7 @@ func main() {
 			go func() {
 				log.Info("(re-)connecting IRC client")
 				if err := ircHdl.Run(); err != nil {
-					log.WithError(err).Debug("IRC connection failed")
-					// We don't want to spam Sentry with errors each being unique
-					// and not groupable as it contains `localip:localport -> remoteip:remoteport`
-					// therefore we replace it with a generic error and just put
-					// the underlying error in the debug-level log which doesn't
-					// get sent to Sentry
-					log.WithError(errors.New("connection to Twitch IRC servers broke")).Error("IRC run exited unexpectedly")
+					log.WithError(helpers.CleanOpError(err)).Error("IRC run exited unexpectedly")
 				}
 				time.Sleep(ircReconnectDelay)
 				ircDisconnected <- struct{}{}

pkg/twitch/eventsubWebsocketClient.go

@@ -12,6 +12,8 @@ import (
 	"github.com/gorilla/websocket"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
+
+	"github.com/Luzifer/twitch-bot/v3/internal/helpers"
 )
 
 const (
@@ -173,7 +175,7 @@ func (e *EventSubSocketClient) Run() error {
 
 	defer func() {
 		if err := e.conn.Close(); err != nil {
-			e.logger.WithError(err).Error("finally closing socket")
+			e.logger.WithError(helpers.CleanOpError(err)).Error("finally closing socket")
 		}
 	}()
 

twitchWatcher.go

@@ -7,6 +7,7 @@ import (
 	"github.com/pkg/errors"
 	log "github.com/sirupsen/logrus"
 
+	"github.com/Luzifer/twitch-bot/v3/internal/helpers"
 	"github.com/Luzifer/twitch-bot/v3/internal/service/access"
 	"github.com/Luzifer/twitch-bot/v3/pkg/twitch"
 	"github.com/Luzifer/twitch-bot/v3/plugins"
@@ -392,7 +393,7 @@ func (t *twitchWatcher) updateChannelFromAPI(channel string) error {
 		log.WithField("channel", channel).Info("watching for eventsub events")
 		go func(storedStatus *twitchChannelState) {
 			if err := storedStatus.esc.Run(); err != nil {
-				log.WithField("channel", channel).WithError(err).Error("eventsub client caused error")
+				log.WithField("channel", channel).WithError(helpers.CleanOpError(err)).Error("eventsub client caused error")
 			}
 			storedStatus.CloseESC()
 		}(storedStatus)