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driver.go
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driver.go
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package migraterice
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"github.com/GeertJohan/go.rice"
"github.com/golang-migrate/migrate/v4/source"
)
func init() {
source.Register("rice", &RiceSourceDriver{})
}
type RiceSourceDriver struct {
path string
box *rice.Box
migrations *source.Migrations
}
func WithInstance(box *rice.Box) (source.Driver, error) {
riceSourceDriver := &RiceSourceDriver{
path: "<rice>",
box: box,
migrations: source.NewMigrations(),
}
box.Walk("", func(path string, info os.FileInfo, err error) error {
if err != nil {
return nil
}
m, err := source.DefaultParse(path)
if err != nil {
return nil
}
if !riceSourceDriver.migrations.Append(m) {
return nil
}
return nil
})
return riceSourceDriver, nil
}
func (r *RiceSourceDriver) Open(url string) (source.Driver, error) {
return nil, fmt.Errorf("not yet implemented")
}
func (r *RiceSourceDriver) Close() error {
return nil
}
func (r *RiceSourceDriver) First() (uint, error) {
if v, ok := r.migrations.First(); !ok {
return 0, &os.PathError{
Op: "first",
Path: r.path,
Err: os.ErrNotExist,
}
} else {
return v, nil
}
}
func (r *RiceSourceDriver) Prev(version uint) (uint, error) {
if v, ok := r.migrations.Prev(version); !ok {
return 0, &os.PathError{
Op: fmt.Sprintf("prev for version %v", version),
Path: r.path,
Err: os.ErrNotExist,
}
} else {
return v, nil
}
}
func (r *RiceSourceDriver) Next(version uint) (uint, error) {
if v, ok := r.migrations.Next(version); !ok {
return 0, &os.PathError{
Op: fmt.Sprintf("next for version %v", version),
Path: r.path,
Err: os.ErrNotExist,
}
} else {
return v, nil
}
}
func (r *RiceSourceDriver) ReadUp(version uint) (io.ReadCloser, string, error) {
if m, ok := r.migrations.Up(version); ok {
file, err := r.box.Bytes(m.Raw)
if err != nil {
return nil, "", err
}
return ioutil.NopCloser(bytes.NewReader(file)), m.Identifier, nil
}
return nil, "", &os.PathError{
Op: fmt.Sprintf("read version %v", version),
Path: r.path,
Err: os.ErrNotExist,
}
}
func (r *RiceSourceDriver) ReadDown(version uint) (io.ReadCloser, string, error) {
if m, ok := r.migrations.Down(version); ok {
file, err := r.box.Bytes(m.Raw)
if err != nil {
return nil, "", err
}
return ioutil.NopCloser(bytes.NewReader(file)), m.Identifier, nil
}
return nil, "", &os.PathError{
Op: fmt.Sprintf("read version %v", version),
Path: r.path,
Err: os.ErrNotExist,
}
}