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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,88 +1,15 @@ | ||
| package orm | ||
|
|
||
| import ( | ||
| "reflect" | ||
|
|
||
| "github.com/cosmos/cosmos-sdk/store/prefix" | ||
| "github.com/cosmos/cosmos-sdk/types/errors" | ||
| ) | ||
|
|
||
| // TableExportable | ||
| type TableExportable interface { | ||
| // Table returns the table to export | ||
| Table() table | ||
| } | ||
|
|
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| // SequenceExportable | ||
| type SequenceExportable interface { | ||
| // Sequence returns the sequence to export | ||
| Sequence() Sequence | ||
| } | ||
|
|
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| // ExportTableData iterates over the given table entries and stores them at the passed ModelSlicePtr. | ||
| // When the given table implements the `SequenceExportable` interface then it's current value | ||
| // is returned as well or otherwise defaults to 0. | ||
| func ExportTableData(ctx HasKVStore, t TableExportable, dest ModelSlicePtr) (uint64, error) { | ||
| it, err := t.Table().PrefixScan(ctx, nil, nil) | ||
| if err != nil { | ||
| return 0, errors.Wrap(err, "table PrefixScan failure when exporting table data") | ||
| } | ||
| _, err = ReadAll(it, dest) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
| var seqValue uint64 | ||
| if st, ok := t.(SequenceExportable); ok { | ||
| seqValue = st.Sequence().CurVal(ctx) | ||
| } | ||
| return seqValue, err | ||
| } | ||
|
|
||
| // ImportTableData initializes a table and attaches indexers from the given data interface{}. | ||
| // data should be a slice of structs that implement PrimaryKeyed (eg []*GroupInfo). | ||
| // The seqValue is optional and only used with tables that implement the `SequenceExportable` interface. | ||
| func ImportTableData(ctx HasKVStore, t TableExportable, data interface{}, seqValue uint64) error { | ||
| table := t.Table() | ||
| if err := clearAllInTable(ctx, table); err != nil { | ||
| return errors.Wrap(err, "clear old entries") | ||
| } | ||
|
|
||
| if st, ok := t.(SequenceExportable); ok { | ||
| if err := st.Sequence().InitVal(ctx, seqValue); err != nil { | ||
| return errors.Wrap(err, "sequence") | ||
| } | ||
| } | ||
|
|
||
| // Provided data must be a slice | ||
| modelSlice := reflect.ValueOf(data) | ||
| if modelSlice.Kind() != reflect.Slice { | ||
| return errors.Wrap(ErrArgument, "data must be a slice") | ||
| } | ||
|
|
||
| // Create table entries | ||
| for i := 0; i < modelSlice.Len(); i++ { | ||
| obj, ok := modelSlice.Index(i).Interface().(PrimaryKeyed) | ||
| if !ok { | ||
| return errors.Wrapf(ErrArgument, "unsupported type :%s", reflect.TypeOf(data).Elem().Elem()) | ||
| } | ||
| err := table.Create(ctx, PrimaryKey(obj), obj) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // clearAllInTable deletes all entries in a table with delete interceptors called | ||
| func clearAllInTable(ctx HasKVStore, table table) error { | ||
| store := prefix.NewStore(ctx.KVStore(table.storeKey), []byte{table.prefix}) | ||
| it := store.Iterator(nil, nil) | ||
| defer it.Close() | ||
| for ; it.Valid(); it.Next() { | ||
| if err := table.Delete(ctx, it.Key()); err != nil { | ||
| return err | ||
| } | ||
| } | ||
| return nil | ||
| // Export stores all the values in the table in the passed | ||
| // ModelSlicePtr. If the table has an associated sequence, then its | ||
| // current value is returned, otherwise 0 is returned by default. | ||
| Export(HasKVStore, ModelSlicePtr) (uint64, error) | ||
|
|
||
| // Import clears the table and initializes it from the given data | ||
| // interface{}. data should be a slice of structs that implement | ||
| // PrimaryKeyed (eg []*GroupInfo). The seqValue is optional and only | ||
| // used with tables that have an associated sequence. | ||
| Import(HasKVStore, interface{}, uint64) error | ||
| } |
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