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/
recovery.go
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/
recovery.go
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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package analytics
import (
"bufio"
"compress/gzip"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"github.com/hashicorp/go-multierror"
)
// crashRecovery cleans up the temp and staging dirs post-crash. This function
// assumes that the temp dir exists and is accessible.
func (m *manager) crashRecovery() error {
dirs, err := ioutil.ReadDir(m.tempDir)
if err != nil {
return err
}
var errs error
for _, d := range dirs {
tenant := d.Name()
tempDir := m.getTempDir(tenant)
tempFiles, err := ioutil.ReadDir(tempDir)
if err != nil {
errs = multierror.Append(errs, err)
continue
}
m.prepTenant(tenant)
stageDir := m.getStagingDir(tenant)
// put staged files in upload queue
stagedFiles, err := m.getFilesInStaging()
for _, fi := range stagedFiles {
m.upload(tenant, fi)
}
// recover temp to staging and upload
for _, fi := range tempFiles {
tempFile := filepath.Join(tempDir, fi.Name())
stageFile := filepath.Join(stageDir, fi.Name())
dest, err := os.Create(stageFile)
if err != nil {
errs = multierror.Append(errs, fmt.Errorf("create recovery file %s: %s", tempDir, err))
continue
}
if err := m.recoverFile(tempFile, dest); err != nil {
errs = multierror.Append(errs, fmt.Errorf("recoverFile %s: %s", tempDir, err))
if err := os.Remove(stageFile); err != nil {
errs = multierror.Append(errs, fmt.Errorf("remove stage file %s: %s", tempDir, err))
}
continue
}
if err := os.Remove(tempFile); err != nil {
m.log.Warningf("unable to remove temp file: %s", tempFile)
}
m.upload(tenant, stageFile)
}
}
return errs
}
// recoverFile recovers gzipped data in a file and puts it into a new file.
func (m *manager) recoverFile(oldName string, newFile *os.File) error {
m.log.Warningf("recover file: %s", oldName)
in, err := os.Open(oldName)
if err != nil {
return fmt.Errorf("open %s: %s", oldName, err)
}
br := bufio.NewReader(in)
gzr, err := gzip.NewReader(br)
if err != nil {
return fmt.Errorf("gzip.NewReader(%s): %s", oldName, err)
}
defer gzr.Close()
// buffer size is arbitrary and doesn't really matter
b := make([]byte, 1000)
gzw := gzip.NewWriter(newFile)
for {
var nRead int
if nRead, err = gzr.Read(b); err != nil {
if err != io.EOF && err.Error() != "unexpected EOF" && err.Error() != "gzip: invalid header" {
return fmt.Errorf("scan gzip %s: %s", oldName, err)
}
}
gzw.Write(b[:nRead])
if err != nil {
break
}
}
if err := gzw.Close(); err != nil {
return fmt.Errorf("close gzw %s: %s", oldName, err)
}
if err := newFile.Close(); err != nil {
return fmt.Errorf("close gzw file %s: %s", oldName, err)
}
m.log.Infof("%s recovered to: %s", oldName, newFile.Name())
return nil
}