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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,171 @@ | ||
| package sync | ||
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| import ( | ||
| "context" | ||
| "sync" | ||
| "time" | ||
|
|
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| "github.com/multiversx/mx-chain-core-go/core" | ||
| "github.com/multiversx/mx-chain-core-go/core/check" | ||
| "github.com/multiversx/mx-chain-core-go/data" | ||
| "github.com/multiversx/mx-chain-core-go/marshal" | ||
| "github.com/multiversx/mx-chain-go/dataRetriever" | ||
| "github.com/multiversx/mx-chain-go/process" | ||
| "github.com/multiversx/mx-chain-go/update" | ||
| ) | ||
|
|
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| var _ update.PendingEpochStartShardHeaderSyncHandler = (*pendingEpochStartShardHeader)(nil) | ||
|
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| type pendingEpochStartShardHeader struct { | ||
| mutPending sync.Mutex | ||
| epochStartHeader data.HeaderHandler | ||
| epochStartHash []byte | ||
| latestReceivedHeader data.HeaderHandler | ||
| latestReceivedHash []byte | ||
| targetEpoch uint32 | ||
| targetShardId uint32 | ||
| headersPool dataRetriever.HeadersPool | ||
| chReceived chan bool | ||
| chNew chan bool | ||
| marshalizer marshal.Marshalizer | ||
| stopSyncing bool | ||
| synced bool | ||
| requestHandler process.RequestHandler | ||
| waitTimeBetweenRequests time.Duration | ||
| } | ||
|
|
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| // ArgsNewPendingMiniBlocksSyncer defines the arguments needed for the sycner | ||
| type ArgsNewPendingEpochStartShardHeaderSyncer struct { | ||
| HeadersPool dataRetriever.HeadersPool | ||
| Marshalizer marshal.Marshalizer | ||
| RequestHandler process.RequestHandler | ||
| } | ||
|
|
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| // NewPendingMiniBlocksSyncer creates a syncer for all pending miniblocks | ||
| func NewPendingEpochStartShardHeaderSyncer(args ArgsNewPendingEpochStartShardHeaderSyncer) (*pendingEpochStartShardHeader, error) { | ||
| if check.IfNil(args.HeadersPool) { | ||
| return nil, update.ErrNilHeadersPool | ||
| } | ||
| if check.IfNil(args.Marshalizer) { | ||
| return nil, dataRetriever.ErrNilMarshalizer | ||
| } | ||
| if check.IfNil(args.RequestHandler) { | ||
| return nil, process.ErrNilRequestHandler | ||
| } | ||
|
|
||
| p := &pendingEpochStartShardHeader{ | ||
| mutPending: sync.Mutex{}, | ||
| epochStartHeader: nil, | ||
| epochStartHash: nil, | ||
| targetEpoch: 0, | ||
| targetShardId: 0, | ||
| headersPool: args.HeadersPool, | ||
| chReceived: make(chan bool), | ||
| chNew: make(chan bool), | ||
| requestHandler: args.RequestHandler, | ||
| stopSyncing: true, | ||
| synced: false, | ||
| marshalizer: args.Marshalizer, | ||
| waitTimeBetweenRequests: args.RequestHandler.RequestInterval(), | ||
| } | ||
|
|
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| p.headersPool.RegisterHandler(p.receivedHeader) | ||
|
|
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| return p, nil | ||
| } | ||
|
|
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| // SyncEpochStartShardHeader will sync the epoch start header for a specific shard | ||
| func (p *pendingEpochStartShardHeader) SyncEpochStartShardHeader(shardId uint32, epoch uint32, startNonce uint64, ctx context.Context) error { | ||
| return p.syncEpochStartShardHeader(shardId, epoch, startNonce, ctx) | ||
| } | ||
|
|
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| func (p *pendingEpochStartShardHeader) syncEpochStartShardHeader(shardId uint32, epoch uint32, startNonce uint64, ctx context.Context) error { | ||
| _ = core.EmptyChannel(p.chReceived) | ||
| _ = core.EmptyChannel(p.chNew) | ||
|
|
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| p.mutPending.Lock() | ||
| p.stopSyncing = false | ||
| p.targetEpoch = epoch | ||
| p.targetShardId = shardId | ||
| p.mutPending.Unlock() | ||
|
|
||
| nonce := startNonce | ||
| for { | ||
| p.mutPending.Lock() | ||
| p.stopSyncing = false | ||
| p.requestHandler.RequestShardHeaderByNonce(shardId, nonce+1) | ||
| p.mutPending.Unlock() | ||
|
|
||
| select { | ||
| case <-p.chReceived: | ||
| p.mutPending.Lock() | ||
| p.stopSyncing = true | ||
| p.synced = true | ||
| p.mutPending.Unlock() | ||
| return nil | ||
| case <-p.chNew: | ||
| nonce = p.latestReceivedHeader.GetNonce() | ||
| continue | ||
| case <-ctx.Done(): | ||
| p.mutPending.Lock() | ||
| p.stopSyncing = true | ||
| p.mutPending.Unlock() | ||
| return update.ErrTimeIsOut | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // receivedHeader is a callback function when a new header was received | ||
| func (p *pendingEpochStartShardHeader) receivedHeader(header data.HeaderHandler, headerHash []byte) { | ||
| p.mutPending.Lock() | ||
| if p.stopSyncing { | ||
| p.mutPending.Unlock() | ||
| return | ||
| } | ||
|
|
||
| if header.GetShardID() != p.targetShardId { | ||
| p.mutPending.Unlock() | ||
| return | ||
| } | ||
|
|
||
| p.latestReceivedHash = headerHash | ||
| p.latestReceivedHeader = header | ||
|
|
||
| if header.GetEpoch() != p.targetEpoch || !header.IsStartOfEpochBlock() { | ||
| p.mutPending.Unlock() | ||
| p.chNew <- true | ||
| return | ||
| } | ||
|
|
||
| p.epochStartHash = headerHash | ||
| p.epochStartHeader = header | ||
| p.mutPending.Unlock() | ||
|
|
||
| p.chReceived <- true | ||
| } | ||
|
|
||
| // GetEpochStartHeader returns the synced epoch start header | ||
| func (p *pendingEpochStartShardHeader) GetEpochStartHeader() (data.HeaderHandler, []byte, error) { | ||
| p.mutPending.Lock() | ||
| defer p.mutPending.Unlock() | ||
|
|
||
| if !p.synced || p.epochStartHeader == nil || p.epochStartHash == nil { | ||
| return nil, nil, update.ErrNotSynced | ||
| } | ||
|
|
||
| return p.epochStartHeader, p.epochStartHash, nil | ||
| } | ||
|
|
||
| // ClearFields will reset the state | ||
| func (p *pendingEpochStartShardHeader) ClearFields() { | ||
| p.mutPending.Lock() | ||
| p.epochStartHash = nil | ||
| p.epochStartHeader = nil | ||
| p.synced = false | ||
| p.mutPending.Unlock() | ||
| } | ||
|
|
||
| // IsInterfaceNil returns nil if underlying object is nil | ||
| func (p *pendingEpochStartShardHeader) IsInterfaceNil() bool { | ||
| return p == nil | ||
| } |