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WIP refactor loop to event based processing
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| package relayer | ||
|
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| type ChainProcessor struct { | ||
| chain *Chain | ||
| unrelayedSequencesQueue chan uint64 | ||
| } | ||
|
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| const unrelayedSequencesQueueCapacity = 1000 | ||
|
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| func NewChainProcessor(chain *Chain) *ChainProcessor { | ||
| return &ChainProcessor{ | ||
| chain: chain, | ||
| unrelayedSequencesQueue: make(chan uint64, unrelayedSequencesQueueCapacity), | ||
| } | ||
| } | ||
|
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| func (p *ChainProcessor) Start() { | ||
| go p.unrelayedSequencesWorker() | ||
| } | ||
|
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| func (p *ChainProcessor) unrelayedSequencesWorker() { | ||
| for unrelayedSequence := range p.unrelayedSequencesQueue { | ||
| p.processUnrelayedSequence(unrelayedSequence) | ||
| } | ||
| } | ||
|
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| func (p *ChainProcessor) EnqueueJob(unrelayedSequences []uint64) { | ||
| for _, unrelayedSequence := range unrelayedSequences { | ||
| p.unrelayedSequencesQueue <- unrelayedSequence | ||
| } | ||
| } | ||
|
|
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| func (p *ChainProcessor) processUnrelayedSequence(unrelayedSequence uint64) { | ||
| // TODO | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| package relayer | ||
|
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "sync" | ||
| "time" | ||
|
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| "go.uber.org/zap" | ||
| ) | ||
|
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| type ChainEventBus struct { | ||
| chains map[string]*ChainEventBusChain | ||
| } | ||
|
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| type ChainEventBusChain struct { | ||
| chain *Chain | ||
| subscribers []*ChainEventBusSubscriber | ||
| latestHeight int64 | ||
| lastHeightQueried int64 | ||
| log *zap.Logger | ||
| } | ||
|
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| type ChainEventBusSubscriber struct { | ||
| chainID string | ||
| onNewUnrelayedSequences func([]uint64) | ||
| } | ||
|
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| const ( | ||
| minQueryLoopDuration = 3 * time.Second | ||
| heightQueryTimeout = 5 * time.Second | ||
| ) | ||
|
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| func NewChainEventBus(chains []*Chain, log *zap.Logger) ChainEventBus { | ||
| chainEventBusChains := make(map[string]*ChainEventBusChain) | ||
| for _, chain := range chains { | ||
| chainEventBusChains[chain.ChainID()] = &ChainEventBusChain{ | ||
| chain: chain, | ||
| subscribers: []*ChainEventBusSubscriber{}, | ||
| log: log, | ||
| } | ||
| } | ||
| return ChainEventBus{ | ||
| chains: chainEventBusChains, | ||
| } | ||
| } | ||
|
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| func (ceb *ChainEventBus) Subscribe(srcChainID string, dstChainID string, onNewUnrelayedSequences func([]uint64)) error { | ||
| if _, ok := ceb.chains[srcChainID]; !ok { | ||
| return fmt.Errorf("unable to subscribe, chain id does not exist: %s", srcChainID) | ||
| } | ||
| ceb.chains[srcChainID].subscribers = append(ceb.chains[srcChainID].subscribers, &ChainEventBusSubscriber{ | ||
| chainID: dstChainID, | ||
| onNewUnrelayedSequences: onNewUnrelayedSequences, | ||
| }) | ||
| return nil | ||
| } | ||
|
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| func (ceb *ChainEventBus) Start(ctx context.Context) { | ||
| wg := sync.WaitGroup{} | ||
| for _, chain := range ceb.chains { | ||
| wg.Add(1) | ||
| go chain.QueryLoop(ctx, &wg) | ||
| } | ||
| // wait for initial height from all chains | ||
| wg.Wait() | ||
| } | ||
|
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| func (c *ChainEventBusChain) QueryLoop(ctx context.Context, wg *sync.WaitGroup) { | ||
| haveInitialHeight := false | ||
| for { | ||
| cycleTimeStart := time.Now() | ||
| doneWithThisCycle := func() { | ||
| queryDuration := time.Since(cycleTimeStart) | ||
| if queryDuration < minQueryLoopDuration { | ||
| time.Sleep(minQueryLoopDuration - queryDuration) | ||
| } | ||
| } | ||
| latestHeightQueryCtx, latestHeightQueryCtxCancel := context.WithTimeout(ctx, heightQueryTimeout) | ||
| latestHeight, err := c.chain.ChainProvider.QueryLatestHeight(latestHeightQueryCtx) | ||
| latestHeightQueryCtxCancel() | ||
| if err != nil { | ||
| c.log.Warn("failed to query latest height", zap.String("chainID", c.chain.ChainID()), zap.Error(err)) | ||
| doneWithThisCycle() | ||
| continue | ||
| } | ||
|
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| c.latestHeight = latestHeight | ||
| // have non-zero height now for this chain ID, so caller can unblock | ||
| if !haveInitialHeight { | ||
| haveInitialHeight = true | ||
| wg.Done() | ||
| } | ||
|
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| // TODO add packet commitment and ack queries | ||
| // limit to blocks since lastHeightQueried, except initial query should be full query | ||
| // call onNewUnrelayedSequences in goroutine for each c.Subscriber | ||
|
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| c.lastHeightQueried = latestHeight | ||
|
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| doneWithThisCycle() | ||
| } | ||
| } | ||
|
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| func (ceb *ChainEventBus) GetLatestHeight(chainID string) (int64, error) { | ||
| chain, ok := ceb.chains[chainID] | ||
| if !ok { | ||
| return -1, fmt.Errorf("unable to get latest height, chain id does not exist in event bus: %s", chainID) | ||
| } | ||
| return chain.latestHeight, nil | ||
| } |
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