126 lines
2.6 KiB
Go
126 lines
2.6 KiB
Go
package kv
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import (
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"io"
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"git.iim.gay/grufwub/go-errors"
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)
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var ErrStateClosed = errors.Define("store/kv: state closed")
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// StateRO provides a read-only window to the store. While this
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// state is active during the Read() function window, the entire
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// store will be read-locked. The state is thread-safe for concurrent
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// use UNTIL the moment that your supplied function to Read() returns,
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// then the state has zero guarantees
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type StateRO struct {
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store *KVStore
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}
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func (st *StateRO) Get(key string) ([]byte, error) {
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// Check not closed
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if st.store == nil {
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return nil, ErrStateClosed
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}
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// Pass request to store
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return st.store.get(key)
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}
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func (st *StateRO) GetStream(key string) (io.ReadCloser, error) {
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// Check not closed
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if st.store == nil {
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return nil, ErrStateClosed
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}
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// Pass request to store
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return st.store.getStream(key)
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}
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func (st *StateRO) Has(key string) (bool, error) {
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// Check not closed
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if st.store == nil {
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return false, ErrStateClosed
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}
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// Pass request to store
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return st.store.has(key)
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}
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func (st *StateRO) close() {
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st.store = nil
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}
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// StateRW provides a read-write window to the store. While this
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// state is active during the Update() function window, the entire
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// store will be locked. The state is thread-safe for concurrent
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// use UNTIL the moment that your supplied function to Update() returns,
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// then the state has zero guarantees
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type StateRW struct {
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store *KVStore
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}
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func (st *StateRW) Get(key string) ([]byte, error) {
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// Check not closed
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if st.store == nil {
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return nil, ErrStateClosed
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}
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// Pass request to store
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return st.store.get(key)
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}
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func (st *StateRW) GetStream(key string) (io.ReadCloser, error) {
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// Check not closed
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if st.store == nil {
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return nil, ErrStateClosed
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}
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// Pass request to store
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return st.store.getStream(key)
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}
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func (st *StateRW) Put(key string, value []byte) error {
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// Check not closed
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if st.store == nil {
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return ErrStateClosed
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}
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// Pass request to store
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return st.store.put(key, value)
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}
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func (st *StateRW) PutStream(key string, r io.Reader) error {
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// Check not closed
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if st.store == nil {
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return ErrStateClosed
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}
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// Pass request to store
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return st.store.putStream(key, r)
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}
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func (st *StateRW) Has(key string) (bool, error) {
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// Check not closed
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if st.store == nil {
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return false, ErrStateClosed
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}
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// Pass request to store
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return st.store.has(key)
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}
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func (st *StateRW) Delete(key string) error {
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// Check not closed
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if st.store == nil {
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return ErrStateClosed
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}
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// Pass request to store
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return st.store.delete(key)
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}
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func (st *StateRW) close() {
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st.store = nil
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}
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