97 lines
2.1 KiB
Go
97 lines
2.1 KiB
Go
package helpers
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// This is a quick hack to get Packr working with golang-migrate
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import (
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"bytes"
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"github.com/gobuffalo/packr/v2"
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"github.com/golang-migrate/migrate/v4"
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"github.com/golang-migrate/migrate/v4/source"
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"io"
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"io/ioutil"
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"os"
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"sync"
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)
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type PackrSource struct {
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lock sync.Mutex
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Box *packr.Box
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migrations *source.Migrations
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}
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func (s *PackrSource) loadMigrations() (*source.Migrations, error) {
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migrations := source.NewMigrations()
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for _, filename := range s.Box.List() {
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migration, err := source.Parse(filename)
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if err != nil {
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return nil, err
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}
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migrations.Append(migration)
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}
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return migrations, nil
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}
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func (s *PackrSource) Open(url string) (source.Driver, error) {
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s.lock.Lock()
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defer s.lock.Unlock()
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if migrations, err := s.loadMigrations(); err != nil {
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return nil, err
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} else {
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s.migrations = migrations
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return s, nil
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}
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}
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func (s *PackrSource) Close() error {
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s.lock.Lock()
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defer s.lock.Unlock()
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s.migrations = nil
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return nil
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}
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func (s *PackrSource) First() (version uint, err error) {
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if v, ok := s.migrations.First(); !ok {
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return 0, os.ErrNotExist
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} else {
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return v, nil
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}
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}
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func (s *PackrSource) Prev(version uint) (prevVersion uint, err error) {
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if v, ok := s.migrations.Prev(version); !ok {
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return 0, os.ErrNotExist
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} else {
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return v, nil
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}
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}
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func (s *PackrSource) Next(version uint) (nextVersion uint, err error) {
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if v, ok := s.migrations.Next(version); !ok {
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return 0, os.ErrNotExist
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} else {
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return v, nil
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}
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}
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func (s *PackrSource) ReadUp(version uint) (r io.ReadCloser, identifier string, err error) {
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if migration, ok := s.migrations.Up(version); !ok {
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return nil, "", os.ErrNotExist
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} else {
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b, _ := s.Box.Find(migration.Raw)
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return ioutil.NopCloser(bytes.NewBuffer(b)),
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migration.Identifier,
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nil
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}
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}
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func (s *PackrSource) ReadDown(version uint) (r io.ReadCloser, identifier string, err error) {
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if migration, ok := s.migrations.Down(version); !ok {
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return nil, "", migrate.ErrNilVersion
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} else {
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b := s.Box.Bytes(migration.Raw)
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return ioutil.NopCloser(bytes.NewBuffer(b)),
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migration.Identifier,
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nil
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}
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}
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