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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| package rest | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "sync" | ||
|
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| "github.com/waku-org/go-waku/waku/v2/protocol" | ||
| "github.com/waku-org/go-waku/waku/v2/protocol/pb" | ||
| ) | ||
|
|
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| type MessageCache struct { | ||
| capacity int | ||
| mu sync.RWMutex | ||
| messages map[string]map[string][]*pb.WakuMessage | ||
| messagesByPubsubTopic map[string][]*pb.WakuMessage | ||
| } | ||
|
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| func NewMessageCache(capacity int) *MessageCache { | ||
| return &MessageCache{ | ||
| capacity: capacity, | ||
| messages: make(map[string]map[string][]*pb.WakuMessage), | ||
| messagesByPubsubTopic: make(map[string][]*pb.WakuMessage), | ||
| } | ||
| } | ||
|
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| func (c *MessageCache) Subscribe(contentFilter protocol.ContentFilter) error { | ||
| c.mu.Lock() | ||
| defer c.mu.Unlock() | ||
|
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| if contentFilter.PubsubTopic != "" && len(contentFilter.ContentTopics) == 0 { | ||
| // Cache all messages that match a pubsub topic (but no content topic specified) | ||
| // Used with named sharding | ||
| // Eventually this must be modified once API changes to receive content topics too | ||
| if _, ok := c.messages[contentFilter.PubsubTopic]; !ok { | ||
| c.messagesByPubsubTopic[contentFilter.PubsubTopic] = []*pb.WakuMessage{} | ||
| } | ||
| } else { | ||
| // Cache messages that match a content topic, or pubsub topic + content topic | ||
| pubSubTopicMap, err := protocol.ContentFilterToPubSubTopicMap(contentFilter) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| for pubsubTopic, contentTopics := range pubSubTopicMap { | ||
| if c.messages[pubsubTopic] == nil { | ||
| c.messages[pubsubTopic] = make(map[string][]*pb.WakuMessage) | ||
| } | ||
|
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| for _, topic := range contentTopics { | ||
| if c.messages[pubsubTopic][topic] == nil { | ||
| c.messages[pubsubTopic][topic] = []*pb.WakuMessage{} | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| return nil | ||
| } | ||
|
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| func (c *MessageCache) Unsubscribe(contentFilter protocol.ContentFilter) error { | ||
| c.mu.Lock() | ||
| defer c.mu.Unlock() | ||
|
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| if contentFilter.PubsubTopic != "" && len(contentFilter.ContentTopics) == 0 { | ||
| // Stop caching all messages that match a pubsub topic | ||
| // Used with named sharding | ||
| // Eventually this must be modified once API changes to receive content topics too | ||
| delete(c.messagesByPubsubTopic, contentFilter.PubsubTopic) | ||
| } else { | ||
| pubSubTopicMap, err := protocol.ContentFilterToPubSubTopicMap(contentFilter) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| for pubsubTopic, contentTopics := range pubSubTopicMap { | ||
| for _, contentTopic := range contentTopics { | ||
| delete(c.messages[pubsubTopic], contentTopic) | ||
| } | ||
| } | ||
| } | ||
|
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| return nil | ||
| } | ||
|
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| func (c *MessageCache) AddMessage(envelope *protocol.Envelope) { | ||
| c.mu.Lock() | ||
| defer c.mu.Unlock() | ||
|
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| pubsubTopic := envelope.PubsubTopic() | ||
| contentTopic := envelope.Message().ContentTopic | ||
|
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| if _, ok := c.messagesByPubsubTopic[pubsubTopic]; ok { | ||
| c.messagesByPubsubTopic[pubsubTopic] = append(c.messagesByPubsubTopic[pubsubTopic], envelope.Message()) | ||
| // Keep a specific max number of message per topic | ||
| if len(c.messagesByPubsubTopic[pubsubTopic]) >= c.capacity { | ||
| c.messagesByPubsubTopic[pubsubTopic] = c.messagesByPubsubTopic[pubsubTopic][1:] | ||
| } | ||
| } | ||
|
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| if c.messages[pubsubTopic] == nil || c.messages[pubsubTopic][contentTopic] == nil { | ||
| return | ||
| } | ||
|
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| // Keep a specific max number of message per topic | ||
| if len(c.messages[pubsubTopic][contentTopic]) >= c.capacity { | ||
| c.messages[pubsubTopic][contentTopic] = c.messages[pubsubTopic][contentTopic][1:] | ||
| } | ||
|
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| c.messages[pubsubTopic][contentTopic] = append(c.messages[pubsubTopic][contentTopic], envelope.Message()) | ||
| } | ||
|
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| func (c *MessageCache) GetMessages(pubsubTopic string, contentTopic string) ([]*pb.WakuMessage, error) { | ||
| c.mu.RLock() | ||
| defer c.mu.RUnlock() | ||
|
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| if c.messages[pubsubTopic] == nil || c.messages[pubsubTopic][contentTopic] == nil { | ||
| return nil, fmt.Errorf("not subscribed to pubsubTopic:%s contentTopic: %s", pubsubTopic, contentTopic) | ||
| } | ||
| msgs := c.messages[pubsubTopic][contentTopic] | ||
| c.messages[pubsubTopic][contentTopic] = []*pb.WakuMessage{} | ||
| return msgs, nil | ||
| } | ||
|
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| func (c *MessageCache) GetMessagesWithPubsubTopic(pubsubTopic string) ([]*pb.WakuMessage, error) { | ||
| c.mu.RLock() | ||
| defer c.mu.RUnlock() | ||
|
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| if c.messagesByPubsubTopic[pubsubTopic] == nil { | ||
| return nil, fmt.Errorf("not subscribed to pubsubTopic:%s", pubsubTopic) | ||
| } | ||
|
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| return c.messagesByPubsubTopic[pubsubTopic], nil | ||
| } |
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