4c84173bc0
* The command populates up to the highest known block number
* The anticipated use case is that the listener will be running
in parallel to the populateBlocks command
* This will mean that the listener is responsible for picking up
new blocks, and the populateBlocks command is reposible for
historical blocks
* Reformat SQL statements
55 lines
1.6 KiB
Go
55 lines
1.6 KiB
Go
package geth
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import (
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"fmt"
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"math/big"
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"github.com/8thlight/vulcanizedb/pkg/core"
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"github.com/ethereum/go-ethereum"
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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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)
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type GethBlockchain struct {
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client *ethclient.Client
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readGethHeaders chan *types.Header
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outputBlocks chan core.Block
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newHeadSubscription ethereum.Subscription
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}
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func (blockchain *GethBlockchain) GetBlockByNumber(blockNumber int64) core.Block {
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gethBlock, _ := blockchain.client.BlockByNumber(context.Background(), big.NewInt(blockNumber))
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return GethBlockToCoreBlock(gethBlock)
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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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blockchain.client = client
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return &blockchain
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}
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func (blockchain *GethBlockchain) SubscribeToBlocks(blocks chan core.Block) {
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blockchain.outputBlocks = blocks
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fmt.Println("SubscribeToBlocks")
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inputHeaders := make(chan *types.Header, 10)
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myContext := context.Background()
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blockchain.readGethHeaders = inputHeaders
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subscription, _ := blockchain.client.SubscribeNewHead(myContext, inputHeaders)
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blockchain.newHeadSubscription = subscription
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}
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func (blockchain *GethBlockchain) StartListening() {
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for header := range blockchain.readGethHeaders {
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block := blockchain.GetBlockByNumber(header.Number.Int64())
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blockchain.outputBlocks <- block
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}
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}
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func (blockchain *GethBlockchain) StopListening() {
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blockchain.newHeadSubscription.Unsubscribe()
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}
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