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Merge pull request #521 from ChIoT-Tech/master
SetMaxResumePubInFlight option - limit inflight publish packets on resume
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,161 @@ | ||
| /* | ||
| * Copyright (c) 2013 IBM Corp. | ||
| * | ||
| * All rights reserved. This program and the accompanying materials | ||
| * are made available under the terms of the Eclipse Public License v1.0 | ||
| * which accompanies this distribution, and is available at | ||
| * http://www.eclipse.org/legal/epl-v10.html | ||
| * | ||
| * Contributors: | ||
| * Seth Hoenig | ||
| * Allan Stockdill-Mander | ||
| * Mike Robertson | ||
| */ | ||
|
|
||
| package mqtt | ||
|
|
||
| import ( | ||
| "sort" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/eclipse/paho.mqtt.golang/packets" | ||
| ) | ||
|
|
||
| // OrderedMemoryStore uses a map internally so the order in which All() returns packets is | ||
| // undefined. OrderedMemoryStore resolves this by storing the time the message is added | ||
| // and sorting based upon this. | ||
|
|
||
| // storedMessage encapsulates a message and the time it was initially stored | ||
| type storedMessage struct { | ||
| ts time.Time | ||
| msg packets.ControlPacket | ||
| } | ||
|
|
||
| // OrderedMemoryStore implements the store interface to provide a "persistence" | ||
| // mechanism wholly stored in memory. This is only useful for | ||
| // as long as the client instance exists. | ||
| type OrderedMemoryStore struct { | ||
| sync.RWMutex | ||
| messages map[string]storedMessage | ||
| opened bool | ||
| } | ||
|
|
||
| // NewOrderedMemoryStore returns a pointer to a new instance of | ||
| // OrderedMemoryStore, the instance is not initialized and ready to | ||
| // use until Open() has been called on it. | ||
| func NewOrderedMemoryStore() *OrderedMemoryStore { | ||
| store := &OrderedMemoryStore{ | ||
| messages: make(map[string]storedMessage), | ||
| opened: false, | ||
| } | ||
| return store | ||
| } | ||
|
|
||
| // Open initializes a OrderedMemoryStore instance. | ||
| func (store *OrderedMemoryStore) Open() { | ||
| store.Lock() | ||
| defer store.Unlock() | ||
| store.opened = true | ||
| DEBUG.Println(STR, "OrderedMemoryStore initialized") | ||
| } | ||
|
|
||
| // Put takes a key and a pointer to a Message and stores the | ||
| // message. | ||
| func (store *OrderedMemoryStore) Put(key string, message packets.ControlPacket) { | ||
| store.Lock() | ||
| defer store.Unlock() | ||
| if !store.opened { | ||
| ERROR.Println(STR, "Trying to use memory store, but not open") | ||
| return | ||
| } | ||
| store.messages[key] = storedMessage{ts: time.Now(), msg: message} | ||
| } | ||
|
|
||
| // Get takes a key and looks in the store for a matching Message | ||
| // returning either the Message pointer or nil. | ||
| func (store *OrderedMemoryStore) Get(key string) packets.ControlPacket { | ||
| store.RLock() | ||
| defer store.RUnlock() | ||
| if !store.opened { | ||
| ERROR.Println(STR, "Trying to use memory store, but not open") | ||
| return nil | ||
| } | ||
| mid := mIDFromKey(key) | ||
| m, ok := store.messages[key] | ||
| if !ok || m.msg == nil { | ||
| CRITICAL.Println(STR, "OrderedMemoryStore get: message", mid, "not found") | ||
| } else { | ||
| DEBUG.Println(STR, "OrderedMemoryStore get: message", mid, "found") | ||
| } | ||
| return m.msg | ||
| } | ||
|
|
||
| // All returns a slice of strings containing all the keys currently | ||
| // in the OrderedMemoryStore. | ||
| func (store *OrderedMemoryStore) All() []string { | ||
| store.RLock() | ||
| defer store.RUnlock() | ||
| if !store.opened { | ||
| ERROR.Println(STR, "Trying to use memory store, but not open") | ||
| return nil | ||
| } | ||
| type tsAndKey struct { | ||
| ts time.Time | ||
| key string | ||
| } | ||
|
|
||
| tsKeys := make([]tsAndKey, 0, len(store.messages)) | ||
| for k, v := range store.messages { | ||
| tsKeys = append(tsKeys, tsAndKey{ts: v.ts, key: k}) | ||
| } | ||
| sort.Slice(tsKeys, func(a int, b int) bool { return tsKeys[a].ts.Before(tsKeys[b].ts) }) | ||
|
|
||
| keys := make([]string, len(tsKeys)) | ||
| for i := range tsKeys { | ||
| keys[i] = tsKeys[i].key | ||
| } | ||
| return keys | ||
| } | ||
|
|
||
| // Del takes a key, searches the OrderedMemoryStore and if the key is found | ||
| // deletes the Message pointer associated with it. | ||
| func (store *OrderedMemoryStore) Del(key string) { | ||
| store.Lock() | ||
| defer store.Unlock() | ||
| if !store.opened { | ||
| ERROR.Println(STR, "Trying to use memory store, but not open") | ||
| return | ||
| } | ||
| mid := mIDFromKey(key) | ||
| _, ok := store.messages[key] | ||
| if !ok { | ||
| WARN.Println(STR, "OrderedMemoryStore del: message", mid, "not found") | ||
| } else { | ||
| delete(store.messages, key) | ||
| DEBUG.Println(STR, "OrderedMemoryStore del: message", mid, "was deleted") | ||
| } | ||
| } | ||
|
|
||
| // Close will disallow modifications to the state of the store. | ||
| func (store *OrderedMemoryStore) Close() { | ||
| store.Lock() | ||
| defer store.Unlock() | ||
| if !store.opened { | ||
| ERROR.Println(STR, "Trying to close memory store, but not open") | ||
| return | ||
| } | ||
| store.opened = false | ||
| DEBUG.Println(STR, "OrderedMemoryStore closed") | ||
| } | ||
|
|
||
| // Reset eliminates all persisted message data in the store. | ||
| func (store *OrderedMemoryStore) Reset() { | ||
| store.Lock() | ||
| defer store.Unlock() | ||
| if !store.opened { | ||
| ERROR.Println(STR, "Trying to reset memory store, but not open") | ||
| } | ||
| store.messages = make(map[string]storedMessage) | ||
| WARN.Println(STR, "OrderedMemoryStore wiped") | ||
| } |
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