63 lines
1.8 KiB
Go
63 lines
1.8 KiB
Go
package stack
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import "github.com/tendermint/basecoin/state"
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type prefixStore struct {
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prefix []byte
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store state.KVStore
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}
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var _ state.KVStore = prefixStore{}
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func (p prefixStore) Set(key, value []byte) {
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key = append(p.prefix, key...)
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p.store.Set(key, value)
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}
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func (p prefixStore) Get(key []byte) (value []byte) {
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key = append(p.prefix, key...)
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return p.store.Get(key)
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}
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// stateSpace will unwrap any prefixStore and then add the prefix
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//
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// this can be used by the middleware and dispatcher to isolate one space,
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// then unwrap and isolate another space
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func stateSpace(store state.KVStore, app string) state.KVStore {
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// unwrap one-level if wrapped
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if pstore, ok := store.(prefixStore); ok {
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store = pstore.store
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}
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return PrefixedStore(app, store)
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}
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func unwrap(store state.KVStore) state.KVStore {
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// unwrap one-level if wrapped
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if pstore, ok := store.(prefixStore); ok {
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store = pstore.store
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}
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return store
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}
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// PrefixedStore allows one to create an isolated state-space for a given
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// app prefix, but it cannot easily be unwrapped
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//
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// This is useful for tests or utilities that have access to the global
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// state to check individual app spaces. Individual apps should not be able
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// to use this to read each other's space
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func PrefixedStore(app string, store state.KVStore) state.KVStore {
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prefix := append([]byte(app), byte(0))
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return prefixStore{prefix, store}
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}
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// PrefixedKey returns the absolute path to a given key in a particular
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// app's state-space
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//
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// This is useful for tests or utilities that have access to the global
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// state to check individual app spaces. Individual apps should not be able
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// to use this to read each other's space
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func PrefixedKey(app string, key []byte) []byte {
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prefix := append([]byte(app), byte(0))
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return append(prefix, key...)
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}
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