111 lines
2.4 KiB
Go
111 lines
2.4 KiB
Go
package utils
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import (
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"bufio"
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"bytes"
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"compress/gzip"
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"database/sql"
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"errors"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"github.com/schollz/sqlite3dump"
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log "github.com/sirupsen/logrus"
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)
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// Restore will attempt to restore the database using a specified backup file.
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func Restore(backupFile string, databaseFile string) error {
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log.Printf("Restoring database backup %s to %s", backupFile, databaseFile)
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data, err := os.ReadFile(backupFile) // nolint
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if err != nil {
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return fmt.Errorf("unable to read backup file %s", err)
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}
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gz, err := gzip.NewReader(bytes.NewBuffer(data))
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if err != nil {
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return fmt.Errorf("unable to read backup file %s", err)
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}
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defer gz.Close()
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var b bytes.Buffer
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if _, err := io.Copy(&b, gz); err != nil { // nolint
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return fmt.Errorf("unable to read backup file %s", err)
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}
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defer gz.Close()
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rawSQL := b.String()
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// nolint:gosec
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if _, err := os.Create(databaseFile); err != nil {
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return errors.New("unable to write restored database")
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}
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// Create a new database by executing the raw SQL
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db, err := sql.Open("sqlite3", databaseFile)
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if err != nil {
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return err
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}
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if _, err := db.Exec(rawSQL); err != nil {
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return err
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}
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return nil
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}
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// Backup will backup the provided instance of the database to the specified file.
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func Backup(db *sql.DB, backupFile string) {
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log.Traceln("Backing up database to", backupFile)
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backupDirectory := filepath.Dir(backupFile)
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if !DoesFileExists(backupDirectory) {
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err := os.MkdirAll(backupDirectory, 0o700)
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if err != nil {
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log.Errorln("unable to create backup directory. check permissions and ownership.", backupDirectory, err)
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return
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}
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}
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// Dump the entire database as plain text sql
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var b bytes.Buffer
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out := bufio.NewWriter(&b)
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if err := sqlite3dump.DumpDB(db, out); err != nil {
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handleError(err)
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return
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}
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_ = out.Flush()
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// Create a new backup file
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f, err := os.OpenFile(backupFile, os.O_WRONLY|os.O_CREATE, 0o600) // nolint
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if err != nil {
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handleError(err)
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return
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}
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// Create a gzip compression writer
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w, err := gzip.NewWriterLevel(f, gzip.BestCompression)
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if err != nil {
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handleError(err)
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return
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}
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// Write compressed data
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if _, err := w.Write(b.Bytes()); err != nil {
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handleError(err)
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return
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}
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if err := w.Close(); err != nil {
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handleError(err)
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return
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}
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}
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func handleError(err error) {
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log.Errorln("unable to backup owncast database to file", err)
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}
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