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package kv
import (
"context"
"errors"
"io"
"codeberg.org/gruf/go-mutexes"
)
// ErrStateClosed is returned on further calls to states after calling Release().
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.
type StateRO struct {
store *KVStore
state *mutexes.LockState
}
// Get: see KVStore.Get(). Returns error if state already closed.
func (st *StateRO) Get(ctx context.Context, key string) ([]byte, error) {
if st.store == nil {
return nil, ErrStateClosed
}
return st.store.get(st.state.RLock, ctx, key)
}
// GetStream: see KVStore.GetStream(). Returns error if state already closed.
func (st *StateRO) GetStream(ctx context.Context, key string) (io.ReadCloser, error) {
if st.store == nil {
return nil, ErrStateClosed
}
return st.store.getStream(st.state.RLock, ctx, key)
}
// Has: see KVStore.Has(). Returns error if state already closed.
func (st *StateRO) Has(ctx context.Context, key string) (bool, error) {
if st.store == nil {
return false, ErrStateClosed
}
return st.store.has(st.state.RLock, ctx, key)
}
// Release will release the store read-lock, and close this state.
func (st *StateRO) Release() {
st.state.UnlockMap()
st.state = nil
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.
type StateRW struct {
store *KVStore
state *mutexes.LockState
}
// Get: see KVStore.Get(). Returns error if state already closed.
func (st *StateRW) Get(ctx context.Context, key string) ([]byte, error) {
if st.store == nil {
return nil, ErrStateClosed
}
return st.store.get(st.state.RLock, ctx, key)
}
// GetStream: see KVStore.GetStream(). Returns error if state already closed.
func (st *StateRW) GetStream(ctx context.Context, key string) (io.ReadCloser, error) {
if st.store == nil {
return nil, ErrStateClosed
}
return st.store.getStream(st.state.RLock, ctx, key)
}
// Put: see KVStore.Put(). Returns error if state already closed.
func (st *StateRW) Put(ctx context.Context, key string, value []byte) (int, error) {
if st.store == nil {
return 0, ErrStateClosed
}
return st.store.put(st.state.Lock, ctx, key, value)
}
// PutStream: see KVStore.PutStream(). Returns error if state already closed.
func (st *StateRW) PutStream(ctx context.Context, key string, r io.Reader) (int64, error) {
if st.store == nil {
return 0, ErrStateClosed
}
return st.store.putStream(st.state.Lock, ctx, key, r)
}
// Has: see KVStore.Has(). Returns error if state already closed.
func (st *StateRW) Has(ctx context.Context, key string) (bool, error) {
if st.store == nil {
return false, ErrStateClosed
}
return st.store.has(st.state.RLock, ctx, key)
}
// Delete: see KVStore.Delete(). Returns error if state already closed.
func (st *StateRW) Delete(ctx context.Context, key string) error {
if st.store == nil {
return ErrStateClosed
}
return st.store.delete(st.state.Lock, ctx, key)
}
// Release will release the store lock, and close this state.
func (st *StateRW) Release() {
st.state.UnlockMap()
st.state = nil
st.store = nil
}
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