Launcher, app/base, sentry, update service

internal/logging/clear.go

@@ -0,0 +1,85 @@
+// Copyright (c) 2020 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+package logging
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"sort"
+
+	"github.com/sirupsen/logrus"
+)
+
+func clearLogs(logDir string, maxLogs int) error {
+	files, err := ioutil.ReadDir(logDir)
+	if err != nil {
+		return err
+	}
+
+	var logsWithPrefix []string
+	var crashesWithPrefix []string
+
+	for _, file := range files {
+		if matchLogName(file.Name()) {
+			if matchStackTraceName(file.Name()) {
+				crashesWithPrefix = append(crashesWithPrefix, file.Name())
+			} else {
+				logsWithPrefix = append(logsWithPrefix, file.Name())
+			}
+		} else {
+			// Older versions of Bridge stored logs in subfolders for each version.
+			// That also has to be cleared and the functionality can be removed after some time.
+			if file.IsDir() {
+				if err := clearLogs(filepath.Join(logDir, file.Name()), maxLogs); err != nil {
+					return err
+				}
+			} else {
+				removeLog(logDir, file.Name())
+			}
+		}
+	}
+
+	removeOldLogs(logDir, logsWithPrefix, maxLogs)
+	removeOldLogs(logDir, crashesWithPrefix, maxLogs)
+
+	return nil
+}
+
+func removeOldLogs(logDir string, filenames []string, maxLogs int) {
+	count := len(filenames)
+	if count <= maxLogs {
+		return
+	}
+
+	sort.Strings(filenames) // Sorted by timestamp: oldest first.
+	for _, filename := range filenames[:count-maxLogs] {
+		removeLog(logDir, filename)
+	}
+}
+
+func removeLog(logDir, filename string) {
+	// We need to be sure to delete only log files.
+	// Directory with logs can also contain other files.
+	if !matchLogName(filename) {
+		return
+	}
+	if err := os.RemoveAll(filepath.Join(logDir, filename)); err != nil {
+		logrus.WithError(err).Error("Failed to remove old logs")
+	}
+}