85 lines
2.2 KiB
Go
85 lines
2.2 KiB
Go
package stub
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import (
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"bytes"
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"fmt"
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"io"
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"os"
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"github.com/golang-migrate/migrate/v4/source"
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)
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func init() {
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source.Register("stub", &Stub{})
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}
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type Config struct{}
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// d, _ := source.Open("stub://")
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// d.(*stub.Stub).Migrations =
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type Stub struct {
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Url string
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Instance interface{}
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Migrations *source.Migrations
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Config *Config
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}
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func (s *Stub) Open(url string) (source.Driver, error) {
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return &Stub{
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Url: url,
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Migrations: source.NewMigrations(),
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Config: &Config{},
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}, nil
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}
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func WithInstance(instance interface{}, config *Config) (source.Driver, error) {
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return &Stub{
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Instance: instance,
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Migrations: source.NewMigrations(),
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Config: config,
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}, nil
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}
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func (s *Stub) Close() error {
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return nil
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}
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func (s *Stub) First() (version uint, err error) {
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if v, ok := s.Migrations.First(); !ok {
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return 0, &os.PathError{Op: "first", Path: s.Url, Err: os.ErrNotExist} // TODO: s.Url can be empty when called with WithInstance
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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 *Stub) 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.PathError{Op: fmt.Sprintf("prev for version %v", version), Path: s.Url, Err: 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 *Stub) 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.PathError{Op: fmt.Sprintf("next for version %v", version), Path: s.Url, Err: 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 *Stub) ReadUp(version uint) (r io.ReadCloser, identifier string, err error) {
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if m, ok := s.Migrations.Up(version); ok {
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return io.NopCloser(bytes.NewBufferString(m.Identifier)), fmt.Sprintf("%v.up.stub", version), nil
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}
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return nil, "", &os.PathError{Op: fmt.Sprintf("read up version %v", version), Path: s.Url, Err: os.ErrNotExist}
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}
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func (s *Stub) ReadDown(version uint) (r io.ReadCloser, identifier string, err error) {
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if m, ok := s.Migrations.Down(version); ok {
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return io.NopCloser(bytes.NewBufferString(m.Identifier)), fmt.Sprintf("%v.down.stub", version), nil
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}
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return nil, "", &os.PathError{Op: fmt.Sprintf("read down version %v", version), Path: s.Url, Err: os.ErrNotExist}
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}
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