// ShouldRun decides if the migration should be applied or removed, based on
// the direction and desired version to reach.
func ShouldRun(tx *sql.Tx, migration string, direction Direction, desiredVersion int) bool {
version, err := Revision(migration)
if err != nil {
glog.Warningf("Unable to determine the revision of %s", migration)
return false
}
switch direction {
case Up:
return IsUp(version, desiredVersion) && !IsMigrated(tx, migration)
case Down:
return IsDown(version, desiredVersion) && IsMigrated(tx, migration)
}
return false
}
// LatestRevision returns the latest revision available from the SQL files in
// the migrations directory.
func LatestRevision(directory string) int {
migrations, err := Available(directory, Down)
if err != nil {
println(err.Error())
return 0
}
if len(migrations) == 0 {
return 0
}
// Find a valid filename
for _, filename := range migrations {
rev, err := Revision(filename)
if err != nil {
glog.Warningf("Invalid migration: %s", filename)
continue
}
return rev
}
return 0
}