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db75092aa6
* Use nonce in data messages to de-dupe SendData API. With API retries, it is possible that some data messages are sent multiple times. Check the nonce (if present) to de-dupe data messages before forwarding it to the clients. * add nonce to UserPacket * defer unlock * 128-bit UUID as nonce * - UUID nonce - make a UserPacketDeduper module for easier re-use. * deps * feedback
67 lines
1.3 KiB
Go
67 lines
1.3 KiB
Go
// Copyright 2023 LiveKit, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package rtc
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import (
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"sync"
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"github.com/google/uuid"
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"github.com/livekit/protocol/livekit"
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)
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const (
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maxSize = 100
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)
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type UserPacketDeduper struct {
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lock sync.Mutex
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seen map[uuid.UUID]uuid.UUID
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head uuid.UUID
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tail uuid.UUID
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}
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func NewUserPacketDeduper() *UserPacketDeduper {
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return &UserPacketDeduper{
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seen: make(map[uuid.UUID]uuid.UUID),
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}
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}
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func (u *UserPacketDeduper) IsDuplicate(up *livekit.UserPacket) bool {
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id, err := uuid.FromBytes(up.Nonce)
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if err != nil {
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return false
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}
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u.lock.Lock()
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defer u.lock.Unlock()
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if u.head == id {
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return true
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}
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if _, ok := u.seen[id]; ok {
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return true
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}
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u.seen[u.head] = id
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u.head = id
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if len(u.seen) == maxSize {
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tail := u.tail
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u.tail = u.seen[tail]
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delete(u.seen, tail)
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}
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return false
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}
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