mirror of
https://github.com/vmware-tanzu/velero.git
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104 lines
2.9 KiB
Go
104 lines
2.9 KiB
Go
/*
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Copyright The Velero Contributors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package logging
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import (
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"compress/gzip"
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"io"
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"os"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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)
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// DualModeLogger is a thread safe logger interface to write logs to dual targets, one of which
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// is a persist file, so that the log could be further transferred.
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type DualModeLogger interface {
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logrus.FieldLogger
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// DoneForPersist stops outputting logs to the persist file
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DoneForPersist(log logrus.FieldLogger)
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// GetPersistFile moves the persist file pointer to beginning and returns it
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GetPersistFile() (*os.File, error)
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// Dispose closes the temp file pointer and removes the file
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Dispose(log logrus.FieldLogger)
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}
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type tempFileLogger struct {
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logrus.FieldLogger
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logger *logrus.Logger
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file *os.File
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w *gzip.Writer
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}
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// NewTempFileLogger creates a DualModeLogger instance that writes logs to both Stdout and a file in the temp folder.
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func NewTempFileLogger(logLevel logrus.Level, logFormat Format, hook *LogHook, fields logrus.Fields) (DualModeLogger, error) {
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file, err := os.CreateTemp("", "")
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if err != nil {
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return nil, errors.Wrap(err, "error creating temp file")
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}
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w := gzip.NewWriter(file)
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logger := DefaultLogger(logLevel, logFormat)
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logger.Out = io.MultiWriter(os.Stdout, w)
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if hook != nil {
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logger.Hooks.Add(hook)
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}
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return &tempFileLogger{
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FieldLogger: logger.WithFields(fields),
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logger: logger,
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file: file,
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w: w,
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}, nil
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}
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func (p *tempFileLogger) DoneForPersist(log logrus.FieldLogger) {
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p.logger.SetOutput(os.Stdout)
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if err := p.w.Close(); err != nil {
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log.WithError(err).Warn("error closing gzip writer")
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}
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}
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func (p *tempFileLogger) GetPersistFile() (*os.File, error) {
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if _, err := p.file.Seek(0, 0); err != nil {
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return nil, errors.Wrap(err, "error resetting log file offset to 0")
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}
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return p.file, nil
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}
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func (p *tempFileLogger) Dispose(log logrus.FieldLogger) {
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p.w.Close()
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closeAndRemoveFile(p.file, log)
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}
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func closeAndRemoveFile(file *os.File, log logrus.FieldLogger) {
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if file == nil {
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log.Debug("Skipping removal of temp log file due to nil file pointer")
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return
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}
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if err := file.Close(); err != nil {
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log.WithError(err).WithField("file", file.Name()).Warn("error closing temp log file")
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}
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if err := os.Remove(file.Name()); err != nil {
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log.WithError(err).WithField("file", file.Name()).Warn("error removing temp log file")
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}
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}
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