Implement GethBlockchain
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@ -2,4 +2,5 @@ package core
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type Blockchain interface {
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type Blockchain interface {
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RegisterObserver(observer BlockchainObserver)
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RegisterObserver(observer BlockchainObserver)
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SubscribeToEvents()
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}
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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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type BlockchainLoggingObserver struct{}
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func (blockchainObserver BlockchainLoggingObserver) NotifyBlockAdded(block Block) {
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func (blockchainObserver BlockchainLoggingObserver) NotifyBlockAdded(block Block) {
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fmt.Println("Added block: %f", block.Number)
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fmt.Printf("New block was added: %d\n", block.Number)
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}
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}
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@ -12,6 +12,11 @@ import (
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var _ = Describe("The fake blockchain", func() {
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var _ = Describe("The fake blockchain", func() {
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It("conforms to the Blockchain interface", func() {
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var blockchain core.Blockchain = &fakes.Blockchain{}
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Expect(blockchain).ShouldNot(BeNil())
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})
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It("lets the only observer know when a block was added", func() {
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It("lets the only observer know when a block was added", func() {
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blockchain := fakes.Blockchain{}
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blockchain := fakes.Blockchain{}
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blockchainObserver := &fakes.BlockchainObserver{}
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blockchainObserver := &fakes.BlockchainObserver{}
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@ -1,14 +1,43 @@
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package core
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package core
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import "fmt"
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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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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() *GethBlockchain {
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func NewGethBlockchain() *GethBlockchain {
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fmt.Println("Creating Gethblockchain")
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fmt.Println("Creating Geth Blockchain")
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return &GethBlockchain{}
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blockchain := GethBlockchain{}
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client, _ := ethclient.Dial("/var/folders/b3/z7fhy7cs06q8d7y3_pwwt4x40000gn/T/ethereum_dev_mode/geth.ipc")
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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(header *types.Header) {
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block := Block{Number: header.Number}
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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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}
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func (blockchain *GethBlockchain) RegisterObserver(_ BlockchainObserver) {
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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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blocks := 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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}
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}
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}
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@ -17,3 +17,6 @@ func (blockchain *Blockchain) AddBlock(block core.Block) {
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observer.NotifyBlockAdded(block)
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observer.NotifyBlockAdded(block)
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}
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}
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}
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}
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func (_ *Blockchain) SubscribeToEvents() {
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}
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4
main.go
4
main.go
@ -1,13 +1,11 @@
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package main
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package main
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import (
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import (
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"fmt"
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"github.com/8thlight/vulcanizedb/core"
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"github.com/8thlight/vulcanizedb/core"
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)
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)
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func main() {
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func main() {
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fmt.Println("Starting connection")
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var blockchain core.Blockchain = core.NewGethBlockchain()
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var blockchain core.Blockchain = core.NewGethBlockchain()
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blockchain.RegisterObserver(core.BlockchainLoggingObserver{})
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blockchain.RegisterObserver(core.BlockchainLoggingObserver{})
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blockchain.SubscribeToEvents()
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}
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}
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