67 lines
1.7 KiB
Go
67 lines
1.7 KiB
Go
package root
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import (
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corestore "cosmossdk.io/core/store"
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"cosmossdk.io/store/v2"
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)
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var (
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_ corestore.Reader = (*Reader)(nil)
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_ corestore.ReaderMap = (*ReaderMap)(nil)
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)
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// ReaderMap defines an adapter around a RootStore that only exposes read-only
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// operations. This is useful for exposing a read-only view of the RootStore at
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// a specific version in history, which could also be the latest state.
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type ReaderMap struct {
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vReader store.VersionedReader
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version uint64
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}
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func NewReaderMap(v uint64, vr store.VersionedReader) *ReaderMap {
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return &ReaderMap{
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vReader: vr,
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version: v,
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}
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}
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func (rm *ReaderMap) GetReader(actor []byte) (corestore.Reader, error) {
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return NewReader(rm.version, rm.vReader, actor), nil
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}
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// Reader represents a read-only adapter for accessing data from the root store.
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type Reader struct {
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version uint64 // The version of the data.
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vReader store.VersionedReader // The root store to read data from.
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actor []byte // The actor associated with the data.
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}
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func NewReader(v uint64, vr store.VersionedReader, actor []byte) *Reader {
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return &Reader{
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version: v,
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vReader: vr,
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actor: actor,
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}
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}
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func (roa *Reader) Has(key []byte) (bool, error) {
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val, err := roa.vReader.Has(roa.actor, roa.version, key)
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if err != nil {
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return false, err
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}
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return val, nil
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}
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func (roa *Reader) Get(key []byte) ([]byte, error) {
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return roa.vReader.Get(roa.actor, roa.version, key)
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}
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func (roa *Reader) Iterator(start, end []byte) (corestore.Iterator, error) {
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return roa.vReader.Iterator(roa.actor, roa.version, start, end)
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}
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func (roa *Reader) ReverseIterator(start, end []byte) (corestore.Iterator, error) {
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return roa.vReader.ReverseIterator(roa.actor, roa.version, start, end)
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}
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