- The events will be persisted in queueStore if `queueDir` is set. - Else, if queueDir is not set events persist in memory. The events are replayed back when the mqtt broker is back online.
104 lines
2.2 KiB
Go
104 lines
2.2 KiB
Go
/*
|
|
* Minio Cloud Storage, (C) 2019 Minio, Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package target
|
|
|
|
import (
|
|
"sync"
|
|
|
|
"github.com/minio/minio/pkg/event"
|
|
)
|
|
|
|
const (
|
|
maxStoreLimit = 10000
|
|
)
|
|
|
|
// MemoryStore persists events in memory.
|
|
type MemoryStore struct {
|
|
sync.RWMutex
|
|
events map[string]event.Event
|
|
eC uint16
|
|
limit uint16
|
|
}
|
|
|
|
// NewMemoryStore creates a memory store instance.
|
|
func NewMemoryStore(limit uint16) *MemoryStore {
|
|
if limit == 0 || limit > maxStoreLimit {
|
|
limit = maxStoreLimit
|
|
}
|
|
memoryStore := &MemoryStore{
|
|
events: make(map[string]event.Event),
|
|
limit: limit,
|
|
}
|
|
return memoryStore
|
|
}
|
|
|
|
// Open is in-effective here.
|
|
// Implemented for interface compatibility.
|
|
func (store *MemoryStore) Open() error {
|
|
return nil
|
|
}
|
|
|
|
// Put - puts the event in store.
|
|
func (store *MemoryStore) Put(e event.Event) error {
|
|
store.Lock()
|
|
defer store.Unlock()
|
|
if store.eC == store.limit {
|
|
return ErrLimitExceeded
|
|
}
|
|
key, kErr := getNewUUID()
|
|
if kErr != nil {
|
|
return kErr
|
|
}
|
|
store.events[key] = e
|
|
store.eC++
|
|
return nil
|
|
}
|
|
|
|
// Get - retrieves the event from store.
|
|
func (store *MemoryStore) Get(key string) (event.Event, error) {
|
|
store.RLock()
|
|
defer store.RUnlock()
|
|
|
|
if event, exist := store.events[key]; exist {
|
|
return event, nil
|
|
}
|
|
|
|
return event.Event{}, ErrNoSuchKey
|
|
}
|
|
|
|
// Del - deletes the event from store.
|
|
func (store *MemoryStore) Del(key string) {
|
|
store.Lock()
|
|
defer store.Unlock()
|
|
|
|
delete(store.events, key)
|
|
|
|
store.eC--
|
|
}
|
|
|
|
// ListAll - lists all the keys in the store.
|
|
func (store *MemoryStore) ListAll() []string {
|
|
store.RLock()
|
|
defer store.RUnlock()
|
|
|
|
keys := []string{}
|
|
for k := range store.events {
|
|
keys = append(keys, k)
|
|
}
|
|
|
|
return keys
|
|
}
|