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// Copyright or © or Copr. happyDNS (2020)
//
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// contact@happydomain.org
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//
// This software is a computer program whose purpose is to provide a modern
// interface to interact with DNS systems.
//
// This software is governed by the CeCILL license under French law and abiding
// by the rules of distribution of free software. You can use, modify and/or
// redistribute the software under the terms of the CeCILL license as
// circulated by CEA, CNRS and INRIA at the following URL
// "http://www.cecill.info".
//
// As a counterpart to the access to the source code and rights to copy, modify
// and redistribute granted by the license, users are provided only with a
// limited warranty and the software's author, the holder of the economic
// rights, and the successive licensors have only limited liability.
//
// In this respect, the user's attention is drawn to the risks associated with
// loading, using, modifying and/or developing or reproducing the software by
// the user in light of its specific status of free software, that may mean
// that it is complicated to manipulate, and that also therefore means that it
// is reserved for developers and experienced professionals having in-depth
// computer knowledge. Users are therefore encouraged to load and test the
// software's suitability as regards their requirements in conditions enabling
// the security of their systems and/or data to be ensured and, more generally,
// to use and operate it in the same conditions as regards security.
//
// The fact that you are presently reading this means that you have had
// knowledge of the CeCILL license and that you accept its terms.
package database
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import (
"fmt"
"log"
)
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type LevelDBMigrationFunc func ( s * LevelDBStorage ) error
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var migrations [ ] LevelDBMigrationFunc = [ ] LevelDBMigrationFunc {
migrateFrom0 ,
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migrateFrom1 ,
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migrateFrom2 ,
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migrateFrom3 ,
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}
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func ( s * LevelDBStorage ) DoMigration ( ) ( err error ) {
found := false
found , err = s . db . Has ( [ ] byte ( "version" ) , nil )
if err != nil {
return
}
var version int
if ! found {
version = len ( migrations )
err = s . put ( "version" , version )
if err != nil {
return
}
}
err = s . get ( "version" , & version )
if err != nil {
return
}
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if version > len ( migrations ) {
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return fmt . Errorf ( "Your database has revision %d, which is newer than the revision this happyDomain version can handle (max DB revision %d). Please update happyDomain" , version , len ( migrations ) )
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}
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for v , migration := range migrations [ version : ] {
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log . Printf ( "Doing migration from %d to %d" , version + v , version + v + 1 )
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// Do the migration
if err = migration ( s ) ; err != nil {
return
}
// Save the step
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if err = s . put ( "version" , version + v + 1 ) ; err != nil {
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return
}
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log . Printf ( "Migration from %d to %d DONE!" , version + v , version + v + 1 )
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}
return nil
}