51 lines
1.4 KiB
Go
51 lines
1.4 KiB
Go
package core
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import (
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"fmt"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/ethclient"
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"golang.org/x/net/context"
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"reflect"
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)
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type GethBlockchain struct {
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client *ethclient.Client
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observers []BlockchainObserver
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}
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func NewGethBlockchain(ipcPath string) *GethBlockchain {
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fmt.Printf("Creating Geth Blockchain to: %s\n", ipcPath)
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blockchain := GethBlockchain{}
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client, _ := ethclient.Dial(ipcPath)
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// TODO: handle error gracefully
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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(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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blockchain.observers = append(blockchain.observers, observer)
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}
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func (blockchain *GethBlockchain) SubscribeToEvents() {
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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, 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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