ipld-eth-server/pkg/geth/geth_blockchain.go

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package geth
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import (
"fmt"
"math/big"
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"github.com/8thlight/vulcanizedb/pkg/core"
"github.com/ethereum/go-ethereum"
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"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethclient"
"golang.org/x/net/context"
)
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type GethBlockchain struct {
client *ethclient.Client
readGethHeaders chan *types.Header
outputBlocks chan core.Block
newHeadSubscription ethereum.Subscription
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}
func (blockchain *GethBlockchain) GetBlockByNumber(blockNumber int64) core.Block {
gethBlock, _ := blockchain.client.BlockByNumber(context.Background(), big.NewInt(blockNumber))
return GethBlockToCoreBlock(gethBlock)
}
func NewGethBlockchain(ipcPath string) *GethBlockchain {
fmt.Printf("Creating Geth Blockchain to: %s\n", ipcPath)
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blockchain := GethBlockchain{}
client, _ := ethclient.Dial(ipcPath)
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blockchain.client = client
return &blockchain
}
func (blockchain *GethBlockchain) SubscribeToBlocks(blocks chan core.Block) {
blockchain.outputBlocks = blocks
fmt.Println("SubscribeToBlocks")
inputHeaders := make(chan *types.Header, 10)
myContext := context.Background()
blockchain.readGethHeaders = inputHeaders
subscription, _ := blockchain.client.SubscribeNewHead(myContext, inputHeaders)
blockchain.newHeadSubscription = subscription
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}
func (blockchain *GethBlockchain) StartListening() {
for header := range blockchain.readGethHeaders {
block := blockchain.GetBlockByNumber(header.Number.Int64())
blockchain.outputBlocks <- block
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}
}
func (blockchain *GethBlockchain) StopListening() {
blockchain.newHeadSubscription.Unsubscribe()
}