Output the number of transactions when logging a new block
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cc05feee3f
commit
51ab23dd3a
@ -4,4 +4,5 @@ import "math/big"
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type Block struct {
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Number *big.Int
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NumberOfTransactions int
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}
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@ -5,5 +5,5 @@ import "fmt"
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type BlockchainLoggingObserver struct{}
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func (blockchainObserver BlockchainLoggingObserver) NotifyBlockAdded(block Block) {
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fmt.Printf("New block was added: %d\n", block.Number)
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fmt.Printf("New block was added: %d, %d\n", block.Number, block.NumberOfTransactions)
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}
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@ -21,12 +21,18 @@ func NewGethBlockchain(ipcPath string) *GethBlockchain {
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blockchain.client = client
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return &blockchain
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}
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func (blockchain GethBlockchain) notifyObservers(header *types.Header) {
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block := Block{Number: header.Number}
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func (blockchain GethBlockchain) notifyObservers(getBlock *types.Block) {
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block := convertBlock(getBlock)
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for _, observer := range blockchain.observers {
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observer.NotifyBlockAdded(block)
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}
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}
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func convertBlock(gethBlock *types.Block) Block {
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return Block{
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Number: gethBlock.Number(),
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NumberOfTransactions: len(gethBlock.Transactions()),
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}
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}
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func (blockchain *GethBlockchain) RegisterObserver(observer BlockchainObserver) {
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fmt.Printf("Registering observer: %v\n", reflect.TypeOf(observer))
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@ -34,10 +40,11 @@ func (blockchain *GethBlockchain) RegisterObserver(observer BlockchainObserver)
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}
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func (blockchain *GethBlockchain) SubscribeToEvents() {
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blocks := make(chan *types.Header, 10)
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headers := make(chan *types.Header, 10)
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myContext := context.Background()
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blockchain.client.SubscribeNewHead(myContext, blocks)
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for block := range blocks {
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blockchain.notifyObservers(block)
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blockchain.client.SubscribeNewHead(myContext, headers)
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for header := range headers {
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gethBlock, _ := blockchain.client.BlockByNumber(myContext, header.Number)
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blockchain.notifyObservers(gethBlock)
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}
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}
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