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package kv
import (
"io"
"sync"
"codeberg.org/gruf/go-errors"
)
var ErrStateClosed = errors.New("store/kv: state closed")
// StateRO provides a read-only window to the store. While this
// state is active during the Read() function window, the entire
// store will be read-locked. The state is thread-safe for concurrent
// use UNTIL the moment that your supplied function to Read() returns,
// then the state has zero guarantees
type StateRO struct {
store *KVStore
mutex sync.RWMutex
}
func (st *StateRO) Get(key string) ([]byte, error) {
// Get state read lock
st.mutex.RLock()
defer st.mutex.RUnlock()
// Check not closed
if st.store == nil {
return nil, ErrStateClosed
}
// Pass request to store
return st.store.get(key)
}
func (st *StateRO) GetStream(key string) (io.ReadCloser, error) {
// Get state read lock
st.mutex.RLock()
defer st.mutex.RUnlock()
// Check not closed
if st.store == nil {
return nil, ErrStateClosed
}
// Pass request to store
return st.store.getStream(key)
}
func (st *StateRO) Has(key string) (bool, error) {
// Get state read lock
st.mutex.RLock()
defer st.mutex.RUnlock()
// Check not closed
if st.store == nil {
return false, ErrStateClosed
}
// Pass request to store
return st.store.has(key)
}
func (st *StateRO) Release() {
// Get state write lock
st.mutex.Lock()
defer st.mutex.Unlock()
// Release the store
if st.store != nil {
st.store.mutex.RUnlock()
st.store = nil
}
}
// StateRW provides a read-write window to the store. While this
// state is active during the Update() function window, the entire
// store will be locked. The state is thread-safe for concurrent
// use UNTIL the moment that your supplied function to Update() returns,
// then the state has zero guarantees
type StateRW struct {
store *KVStore
mutex sync.RWMutex
}
func (st *StateRW) Get(key string) ([]byte, error) {
// Get state read lock
st.mutex.RLock()
defer st.mutex.RUnlock()
// Check not closed
if st.store == nil {
return nil, ErrStateClosed
}
// Pass request to store
return st.store.get(key)
}
func (st *StateRW) GetStream(key string) (io.ReadCloser, error) {
// Get state read lock
st.mutex.RLock()
defer st.mutex.RUnlock()
// Check not closed
if st.store == nil {
return nil, ErrStateClosed
}
// Pass request to store
return st.store.getStream(key)
}
func (st *StateRW) Put(key string, value []byte) error {
// Get state read lock
st.mutex.RLock()
defer st.mutex.RUnlock()
// Check not closed
if st.store == nil {
return ErrStateClosed
}
// Pass request to store
return st.store.put(key, value)
}
func (st *StateRW) PutStream(key string, r io.Reader) error {
// Get state read lock
st.mutex.RLock()
defer st.mutex.RUnlock()
// Check not closed
if st.store == nil {
return ErrStateClosed
}
// Pass request to store
return st.store.putStream(key, r)
}
func (st *StateRW) Has(key string) (bool, error) {
// Get state read lock
st.mutex.RLock()
defer st.mutex.RUnlock()
// Check not closed
if st.store == nil {
return false, ErrStateClosed
}
// Pass request to store
return st.store.has(key)
}
func (st *StateRW) Delete(key string) error {
// Get state read lock
st.mutex.RLock()
defer st.mutex.RUnlock()
// Check not closed
if st.store == nil {
return ErrStateClosed
}
// Pass request to store
return st.store.delete(key)
}
func (st *StateRW) Release() {
// Get state write lock
st.mutex.Lock()
defer st.mutex.Unlock()
// Release the store
if st.store != nil {
st.store.mutex.Unlock()
st.store = nil
}
}
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