// NewInProcRPCClient will start a new RPC server for the given node and returns a client to interact with it.
func NewInProcRPCClient(stack *node.Node) *inProcClient {
server := rpc.NewServer()
offered := stack.APIs()
for _, api := range offered {
server.RegisterName(api.Namespace, api.Service)
}
web3 := node.NewPublicWeb3API(stack)
server.RegisterName("web3", web3)
var ethereum *eth.Ethereum
if err := stack.Service(ðereum); err == nil {
net := eth.NewPublicNetAPI(stack.Server(), ethereum.NetVersion())
server.RegisterName("net", net)
} else {
glog.V(logger.Warn).Infof("%v\n", err)
}
buf := &buf{
requests: make(chan []byte),
responses: make(chan []byte),
}
client := &inProcClient{
server: server,
buf: buf,
}
go func() {
server.ServeCodec(rpc.NewJSONCodec(client.buf))
}()
return client
}
func main() {
// Parse and handle the command line flags
flag.Parse()
log15.Root().SetHandler(log15.LvlFilterHandler(log15.Lvl(*loglevelFlag), log15.StderrHandler))
datadir := *datadirFlag
if datadir == "" {
datadir = filepath.Join(os.Getenv("HOME"), ".etherapis")
}
if err := os.MkdirAll(datadir, 0700); err != nil {
log15.Crit("Failed to create data directory: %v", err)
return
}
// Assemble and start the Ethereum client
log15.Info("Booting Ethereum client...")
client, err := geth.New(datadir, geth.TestNet)
if err != nil {
log15.Crit("Failed to create Ethereum client", "error", err)
return
}
if err := client.Start(); err != nil {
log15.Crit("Failed to start Ethereum client", "error", err)
return
}
api, err := client.Attach()
if err != nil {
log15.Crit("Failed to attach to node", "error", err)
return
}
// Wait for network connectivity and monitor synchronization
log15.Info("Searching for network peers...")
server := client.Stack().Server()
for len(server.Peers()) == 0 {
time.Sleep(100 * time.Millisecond)
}
go monitorSync(api)
// Make sure we're at least semi recent on the chain before continuing
waitSync(*syncFlag, api)
var eth *eth.Ethereum
err = client.Stack().Service(ð)
if err != nil {
log15.Crit("Failed to fetch eth service", "error", err)
return
}
contract, err := channels.Fetch(eth.ChainDb(), eth.EventMux(), eth.BlockChain())
if err != nil {
log15.Crit("Failed to get contract", "error", err)
return
}
// Depending on the flags, execute different things
switch {
case *signFlag != "":
var message struct {
Provider string
Nonce uint64
Amount uint64
}
if err := json.Unmarshal([]byte(*signFlag), &message); err != nil {
log15.Crit("Failed to decode data", "error", err)
return
}
fmt.Println(message)
accounts, err := eth.AccountManager().Accounts()
if err != nil {
log15.Crit("Failed retrieving accounts", "err", err)
}
if len(accounts) == 0 {
log15.Crit("Signing data requires at least one account", "len", len(accounts))
return
}
account := accounts[0]
from := account.Address
to := common.HexToAddress(message.Provider)
hash := contract.Call("getHash", from, to, message.Nonce, message.Amount).([]byte)
log15.Info("getting hash", "hash", common.ToHex(hash))
eth.AccountManager().Unlock(from, "")
sig, err := eth.AccountManager().Sign(account, hash)
if err != nil {
log15.Crit("signing vailed", "err", err)
return
}
log15.Info("generated signature", "sig", common.ToHex(sig))
return
case *importFlag != "":
// Account import, parse the provided .json file and ensure it's proper
manager := eth.AccountManager()
account, err := manager.Import(*importFlag, "")
if err != nil {
log15.Crit("Failed to import specified account", "path", *importFlag, "error", err)
return
}
state, _ := eth.BlockChain().State()
log15.Info("Account successfully imported", "account", fmt.Sprintf("0x%x", account.Address), "balance", state.GetBalance(account.Address))
return
case *accountsFlag:
// Account listing requested, print all accounts and balances
accounts, err := eth.AccountManager().Accounts()
if err != nil || len(accounts) == 0 {
log15.Crit("Failed to retrieve account", "accounts", len(accounts), "error", err)
return
}
state, _ := eth.BlockChain().State()
for i, account := range accounts {
balance := float64(new(big.Int).Div(state.GetBalance(account.Address), common.Finney).Int64()) / 1000
fmt.Printf("Account #%d: %f ether (http://testnet.etherscan.io/address/0x%x)\n", i, balance, account.Address)
}
return
case *accGenFlag > 0:
// We're generating and dumping demo accounts
var nonce uint64
var bank accounts.Account
if *accLiveFlag {
// If we want to fund generated accounts, make sure we can
accounts, err := eth.AccountManager().Accounts()
if err != nil || len(accounts) == 0 {
log15.Crit("Failed to retrieve funding account", "accounts", len(accounts), "error", err)
return
}
bank = accounts[0]
if err := eth.AccountManager().Unlock(bank.Address, "gophergala"); err != nil {
log15.Crit("Failed to unlock funding account", "account", fmt.Sprintf("0x%x", bank.Address), "error", err)
return
}
state, _ := eth.BlockChain().State()
nonce = state.GetNonce(bank.Address)
log15.Info("Funding demo accounts with", "bank", fmt.Sprintf("0x%x", bank.Address), "nonce", nonce)
}
// Start generating the actual accounts
log15.Info("Generating demo accounts", "count", *accGenFlag)
for i := 0; i < *accGenFlag; i++ {
// Generate a new account
account, err := eth.AccountManager().NewAccount("pass")
if err != nil {
log15.Crit("Failed to generate new account", "error", err)
return
}
// Export it's private key
keyPath := fmt.Sprintf("0x%x.key", account.Address)
if err := eth.AccountManager().Export(keyPath, account.Address, "pass"); err != nil {
log15.Crit("Failed to export account", "account", fmt.Sprintf("0x%x", account.Address), "error", err)
return
}
// Clean up so it doesn't clutter out accounts
if err := eth.AccountManager().DeleteAccount(account.Address, "pass"); err != nil {
log15.Crit("Failed to delete account", "account", fmt.Sprintf("0x%x", account.Address), "error", err)
return
}
// If we're just testing, stop here
if !*accLiveFlag {
log15.Info("Account generated and exported", "path", keyPath)
continue
}
// Oh boy, live accounts, send some ether to it and upload to the faucet
allowance := new(big.Int).Mul(big.NewInt(10), common.Ether)
price := new(big.Int).Mul(big.NewInt(50), common.Shannon)
tx := types.NewTransaction(nonce, account.Address, allowance, big.NewInt(21000), price, nil)
sig, err := eth.AccountManager().Sign(bank, tx.SigHash().Bytes())
if err != nil {
log15.Crit("Failed to sign funding transaction", "error", err)
return
}
stx, err := tx.WithSignature(sig)
if err != nil {
log15.Crit("Failed to assemble funding transaction", "error", err)
return
}
if err := eth.TxPool().Add(stx); err != nil {
log15.Crit("Failed to execute transfer", "error", err)
return
}
nonce++
log15.Info("Account successfully funded", "account", fmt.Sprintf("0x%x", account.Address))
// Upload the account to the faucet server
key, err := ioutil.ReadFile(keyPath)
if err != nil {
log15.Crit("Failed to load private key", "error", err)
return
}
res, err := http.Get("https://etherapis.appspot.com/faucet/fund?key=" + string(key))
if err != nil {
log15.Crit("Failed to upload private key to faucet", "error", err)
return
}
res.Body.Close()
log15.Info("Account uploaded to faucet", "account", fmt.Sprintf("0x%x", account.Address))
os.Remove(keyPath)
}
// Just wait a bit to ensure transactions get propagated into the network
log15.Info("Sleeping to ensure transaction propagation")
time.Sleep(10 * time.Second)
return
case len(*queryFlag) > 0:
// Check whether any of our accounts are subscribed to this particular service
accounts, err := eth.AccountManager().Accounts()
if err != nil || len(accounts) == 0 {
log15.Crit("Failed to retrieve account", "accounts", len(accounts), "error", err)
return
}
provider := common.HexToAddress(*queryFlag)
log15.Info("Checking subscription status", "service", fmt.Sprintf("0x%x", provider))
for i, account := range accounts {
// Check if a subscription exists
if !contract.Exists(account.Address, provider) {
fmt.Printf("Account #%d: [0x%x]: not subscribed.\n", i, account.Address)
continue
}
// Retrieve the current balance on the subscription
ethers := contract.Call("getChannelValue", contract.ChannelId(account.Address, provider)).(*big.Int)
funds := float64(new(big.Int).Div(ethers, common.Finney).Int64()) / 1000
fmt.Printf("Account #%d: [0x%x]: subscribed, with %v ether(s) left.\n", i, account.Address, funds)
}
return
case len(*subToFlag) > 0:
// Subscription requested, make sure all the details are provided
accounts, err := eth.AccountManager().Accounts()
if err != nil || len(accounts) < *subAccFlag {
log15.Crit("Failed to retrieve account", "accounts", len(accounts), "requested", *subAccFlag, "error", err)
return
}
account := accounts[*subAccFlag]
// Check if a subscription exists
provider := common.HexToAddress(*subToFlag)
if contract.Exists(account.Address, provider) {
log15.Error("Account already subscribed", "index", *subAccFlag, "account", fmt.Sprintf("0x%x", account.Address), "service", fmt.Sprintf("0x%x", provider))
return
}
// Try to subscribe and wait until it completes
keystore := client.Keystore()
key, err := keystore.GetKey(account.Address, "")
if err != nil {
log15.Crit("Failed to unlock account", "account", fmt.Sprintf("0x%x", account.Address), "error", err)
return
}
amount := new(big.Int).Mul(big.NewInt(int64(1000000000**subFundFlag)), common.Shannon)
log15.Info("Subscribing to new payment channel", "account", fmt.Sprintf("0x%x", account.Address), "service", fmt.Sprintf("0x%x", provider), "ethers", *subFundFlag)
pend := make(chan *channels.Channel)
tx, err := contract.NewChannel(key.PrivateKey, provider, amount, big.NewInt(1), func(sub *channels.Channel) { pend <- sub })
if err != nil {
log15.Crit("Failed to create subscription", "error", err)
return
}
if err := eth.TxPool().Add(tx); err != nil {
log15.Crit("Failed to execute subscription", "error", err)
return
}
log15.Info("Waiting for subscription to be finalized...", "tx", tx)
log15.Info("Successfully subscribed", "channel", fmt.Sprintf("%x", (<-pend).Id))
return
}
if *testFlag {
accounts, err := eth.AccountManager().Accounts()
if err != nil {
log15.Crit("Failed retrieving accounts", "err", err)
}
if len(accounts) < 2 {
log15.Crit("Test vectors requires at least 2 accounts", "len", len(accounts))
return
}
log15.Info("Attempting channel test vectors...")
from := accounts[0].Address
eth.AccountManager().Unlock(from, "")
to := accounts[0].Address
log15.Info("making channel name...", "from", from.Hex(), "to", to.Hex(), "ID", contract.ChannelId(from, to).Hex())
log15.Info("checking existence...", "exists", contract.Exists(from, to))
amount := big.NewInt(1)
hash := contract.Call("getHash", from, to, 0, amount).([]byte)
log15.Info("signing data", "to", to.Hex(), "amount", amount, "hash", common.ToHex(hash))
sig, err := eth.AccountManager().Sign(accounts[0], hash)
if err != nil {
log15.Crit("signing vailed", "err", err)
return
}
log15.Info("verifying signature", "sig", common.ToHex(sig))
if contract.ValidateSig(from, to, 0, amount, sig) {
log15.Info("signature was valid and was verified by the EVM")
} else {
log15.Crit("signature was invalid")
return
}
log15.Info("verifying payment", "sig", common.ToHex(sig))
if valid, _ := contract.Verify(from, to, 0, amount, sig); valid {
log15.Info("payment was valid and was verified by the EVM")
} else {
log15.Crit("payment was invalid")
return
}
log15.Info("verifying invalid payment", "nonce", 1)
if valid, _ := contract.Verify(from, to, 1, amount, sig); valid {
log15.Crit("payment was valid")
return
} else {
log15.Info("payment was invalid")
}
}
// If we're running a proxy, start processing external requests
if *proxyFlag != "" {
// Subscription requested, make sure all the details are provided
accounts, err := eth.AccountManager().Accounts()
if err != nil || len(accounts) < *subAccFlag {
log15.Crit("Failed to retrieve account", "accounts", len(accounts), "requested", *subAccFlag, "error", err)
return
}
account := accounts[*subAccFlag]
if err := eth.AccountManager().Unlock(account.Address, ""); err != nil {
log15.Crit("Failed to unlock provider account", "account", fmt.Sprintf("0x%x", account.Address), "error", err)
return
}
log15.Info("Setuping vault...", "owner", account.Address.Hex())
// Create the payment vault to hold the various authorizations
vault := proxy.NewVault(NewCharger(account, eth.TxPool(), contract, eth.AccountManager()))
vault.AutoCharge(*chargeFlag)
for i, config := range strings.Split(*proxyFlag, ",") {
// Split the proxy configuration
parts := strings.Split(config, ":")
if len(parts) != 3 {
log15.Crit("Invalid proxy config", "config", config)
return
}
extPort, err := strconv.Atoi(parts[0])
if err != nil || extPort < 0 || extPort > 65535 {
log15.Crit("Invalid external port number", "port", parts[0])
return
}
intPort, err := strconv.Atoi(parts[1])
if err != nil || intPort < 0 || intPort > 65535 {
log15.Crit("Invalid internal port number", "port", parts[1])
return
}
var kind proxy.ProxyType
switch strings.ToLower(parts[2]) {
case "call":
kind = proxy.CallProxy
case "data":
kind = proxy.DataProxy
default:
log15.Crit("Unsupported proxy type", "type", parts[2], "allowed", []string{"call", "data"})
return
}
// Create and start the new proxy
gateway := proxy.New(i, extPort, intPort, kind, contract, vault)
go func() {
if err := gateway.Start(); err != nil {
log15.Crit("Failed to start proxy", "error", err)
os.Exit(-1)
}
}()
}
// Wait indefinitely, for now at least
for {
time.Sleep(time.Second)
}
}
// Clean up for now
log15.Info("Terminating Ethereum client...")
if err := client.Stop(); err != nil {
log15.Crit("Failed to terminate Ethereum client", "error", err)
return
}
}