mirror of https://github.com/status-im/migrate.git
126 lines
2.5 KiB
Go
126 lines
2.5 KiB
Go
package awss3
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import (
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"fmt"
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"io"
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"net/url"
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"os"
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"path"
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"strings"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/session"
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"github.com/aws/aws-sdk-go/service/s3"
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"github.com/aws/aws-sdk-go/service/s3/s3iface"
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"github.com/golang-migrate/migrate/source"
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)
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func init() {
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source.Register("s3", &s3Driver{})
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}
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type s3Driver struct {
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s3client s3iface.S3API
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bucket string
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prefix string
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migrations *source.Migrations
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}
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func (s *s3Driver) Open(folder string) (source.Driver, error) {
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u, err := url.Parse(folder)
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if err != nil {
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return nil, err
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}
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sess, err := session.NewSession()
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if err != nil {
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return nil, err
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}
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driver := s3Driver{
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bucket: u.Host,
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prefix: strings.Trim(u.Path, "/") + "/",
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s3client: s3.New(sess),
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migrations: source.NewMigrations(),
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}
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err = driver.loadMigrations()
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if err != nil {
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return nil, err
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}
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return &driver, nil
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}
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func (s *s3Driver) loadMigrations() error {
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output, err := s.s3client.ListObjects(&s3.ListObjectsInput{
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Bucket: aws.String(s.bucket),
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Prefix: aws.String(s.prefix),
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Delimiter: aws.String("/"),
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})
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if err != nil {
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return err
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}
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for _, object := range output.Contents {
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_, fileName := path.Split(aws.StringValue(object.Key))
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m, err := source.DefaultParse(fileName)
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if err != nil {
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continue
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}
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if !s.migrations.Append(m) {
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return fmt.Errorf("unable to parse file %v", aws.StringValue(object.Key))
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}
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}
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return nil
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}
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func (s *s3Driver) Close() error {
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return nil
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}
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func (s *s3Driver) First() (uint, error) {
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v, ok := s.migrations.First()
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if !ok {
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return 0, os.ErrNotExist
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}
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return v, nil
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}
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func (s *s3Driver) Prev(version uint) (uint, error) {
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v, ok := s.migrations.Prev(version)
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if !ok {
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return 0, os.ErrNotExist
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}
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return v, nil
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}
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func (s *s3Driver) Next(version uint) (uint, error) {
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v, ok := s.migrations.Next(version)
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if !ok {
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return 0, os.ErrNotExist
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}
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return v, nil
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}
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func (s *s3Driver) ReadUp(version uint) (io.ReadCloser, string, error) {
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if m, ok := s.migrations.Up(version); ok {
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return s.open(m)
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}
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return nil, "", os.ErrNotExist
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}
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func (s *s3Driver) ReadDown(version uint) (io.ReadCloser, string, error) {
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if m, ok := s.migrations.Down(version); ok {
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return s.open(m)
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}
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return nil, "", os.ErrNotExist
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}
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func (s *s3Driver) open(m *source.Migration) (io.ReadCloser, string, error) {
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key := path.Join(s.prefix, m.Raw)
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object, err := s.s3client.GetObject(&s3.GetObjectInput{
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Bucket: aws.String(s.bucket),
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Key: aws.String(key),
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})
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if err != nil {
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return nil, "", err
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}
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return object.Body, m.Identifier, nil
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}
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