// Call forms a transaction from the given arguments and tries to execute it on
// a private VM with a copy of the state. Any changes are therefore only temporary
// and not part of the actual state. This allows for local execution/queries.
func (be *registryAPIBackend) Call(fromStr, toStr, valueStr, gasStr, gasPriceStr, dataStr string) (string, string, error) {
block := be.bc.CurrentBlock()
statedb, err := state.New(block.Root(), be.chainDb)
if err != nil {
return "", "", err
}
var from *state.StateObject
if len(fromStr) == 0 {
accounts, err := be.am.Accounts()
if err != nil || len(accounts) == 0 {
from = statedb.GetOrNewStateObject(common.Address{})
} else {
from = statedb.GetOrNewStateObject(accounts[0].Address)
}
} else {
from = statedb.GetOrNewStateObject(common.HexToAddress(fromStr))
}
from.SetBalance(common.MaxBig)
msg := callmsg{
from: from,
gas: common.Big(gasStr),
gasPrice: common.Big(gasPriceStr),
value: common.Big(valueStr),
data: common.FromHex(dataStr),
}
if len(toStr) > 0 {
addr := common.HexToAddress(toStr)
msg.to = &addr
}
if msg.gas.Cmp(big.NewInt(0)) == 0 {
msg.gas = big.NewInt(50000000)
}
if msg.gasPrice.Cmp(big.NewInt(0)) == 0 {
msg.gasPrice = new(big.Int).Mul(big.NewInt(50), common.Shannon)
}
header := be.bc.CurrentBlock().Header()
vmenv := core.NewEnv(statedb, be.bc, msg, header)
gp := new(core.GasPool).AddGas(common.MaxBig)
res, gas, err := core.ApplyMessage(vmenv, msg, gp)
return common.ToHex(res), gas.String(), err
}
// MakeAddress converts an account specified directly as a hex encoded string or
// a key index in the key store to an internal account representation.
func MakeAddress(accman *accounts.Manager, account string) (a common.Address, err error) {
// If the specified account is a valid address, return it
if common.IsHexAddress(account) {
return common.HexToAddress(account), nil
}
// Otherwise try to interpret the account as a keystore index
index, err := strconv.Atoi(account)
if err != nil {
return a, fmt.Errorf("invalid account address or index %q", account)
}
hex, err := accman.AddressByIndex(index)
if err != nil {
return a, fmt.Errorf("can't get account #%d (%v)", index, err)
}
return common.HexToAddress(hex), nil
}
// StorageAt returns the data stores in the state for the given address and location.
func (be *registryAPIBackend) StorageAt(addr string, storageAddr string) string {
block := be.bc.CurrentBlock()
state, err := state.New(block.Root(), be.chainDb)
if err != nil {
return ""
}
return state.GetState(common.HexToAddress(addr), common.HexToHash(storageAddr)).Hex()
}
// Store inserts a new authorized payment into the account vault for later
// redemption.
func (v *accountVault) Store(auth *authorization) {
v.lock.Lock()
defer v.lock.Unlock()
consumer := common.HexToAddress(auth.Consumer)
v.auths[consumer] = auth
v.pends[consumer] = auth
}
func (s *Ethereum) Etherbase() (eb common.Address, err error) {
eb = s.etherbase
if (eb == common.Address{}) {
addr, e := s.AccountManager().AddressByIndex(0)
if e != nil {
err = fmt.Errorf("etherbase address must be explicitly specified")
}
eb = common.HexToAddress(addr)
}
return
}
// Charge will redeem all pending payments made to this provider since startup.
func (v *accountVault) Charge(charger Charger) {
v.lock.RLock()
for _, auth := range v.pends {
tx, err := charger.Charge(common.HexToAddress(auth.Consumer), common.HexToAddress(auth.Provider), auth.Nonce, new(big.Int).SetUint64(auth.Amount), common.FromHex(auth.Signature))
if err != nil {
log15.Error("Failed to charge payment", "authorization", auth, "error", err)
} else {
log15.Info("Payment charged", "tx", "http://testnet.etherscan.io/tx/"+tx.Hex())
}
}
v.lock.RUnlock()
v.lock.Lock()
for consumer, auth := range v.auths {
if v.pends[consumer] == auth {
delete(v.pends, consumer)
}
}
v.lock.Unlock()
}
// Store inserts a new authorized payment into the vault for later redemption.
func (v *Vault) Store(auth *authorization) {
v.lock.Lock()
defer v.lock.Unlock()
provider := common.HexToAddress(auth.Provider)
if _, ok := v.vaults[provider]; !ok {
v.vaults[provider] = &accountVault{
auths: make(map[common.Address]*authorization),
pends: make(map[common.Address]*authorization),
}
}
v.vaults[provider].Store(auth)
}
// NameToAddr(from, name) queries the registrar for the address on name
func (self *Registrar) NameToAddr(from common.Address, name string) (address common.Address, err error) {
if zero.MatchString(GlobalRegistrarAddr) {
return address, fmt.Errorf("GlobalRegistrar address is not set")
}
nameHex, extra := encodeName(name, 2)
abi := resolveAbi + nameHex + extra
glog.V(logger.Detail).Infof("NameToAddr data: %s", abi)
res, _, err := self.backend.Call(
from.Hex(),
GlobalRegistrarAddr,
"", "", "",
abi,
)
if err != nil {
return
}
address = common.HexToAddress(res)
return
}
func (h *Header) UnmarshalJSON(data []byte) error {
var ext struct {
ParentHash string
Coinbase string
Difficulty string
GasLimit string
Time *big.Int
Extra string
}
dec := json.NewDecoder(bytes.NewReader(data))
if err := dec.Decode(&ext); err != nil {
return err
}
h.ParentHash = common.HexToHash(ext.ParentHash)
h.Coinbase = common.HexToAddress(ext.Coinbase)
h.Difficulty = common.String2Big(ext.Difficulty)
h.Time = ext.Time
h.Extra = []byte(ext.Extra)
return nil
}
// ServeHTTP implements http.Handler, extracting and validating payment headers
// contained within the HTTP request. If payment information is accepted, the
// request is passed on to the internal service for execution. Otherwise the proxy
// short circuits the request and sends back an appropriate error.
func (p *Proxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
reqLogger := p.logger.New("request-id", atomic.AddUint32(&p.autoid, 1))
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Expose-Headers", VerificationHeader)
// Short circuit CORS pre-flight requests
if r.Method == "OPTIONS" {
reqLogger.Debug("Allowing CORS pre-flight request")
w.Header().Set("Access-Control-Allow-Headers", r.Header.Get("Access-Control-Request-Headers"))
return
}
// Allow head requests through for data APIs to query the content size
if r.Method == "HEAD" {
reqLogger.Debug("Allowing data HEAD request")
w.Header().Set("Access-Control-Expose-Headers", "Content-Length, Content-Range")
res, err := p.service(r)
if err != nil {
reqLogger.Error("Failed to process API request", "error", err)
http.Error(w, "Failed to execute request", http.StatusInternalServerError)
return
}
defer res.Body.Close()
p.forward(w, res)
return
}
// Retrieve the authorization header from the original request
authHeader := r.Header.Get(AuthorizationHeader)
reqLogger.Debug("Received an API request", "authorization", authHeader)
// Ensure that all payment information are present
if authHeader == "" {
p.fail(w, &verification{Error: "Missing HTTP header: " + AuthorizationHeader})
return
}
auth := new(authorization)
if err := json.Unmarshal([]byte(authHeader), auth); err != nil {
p.fail(w, &verification{Error: "Invalid authorization header: " + err.Error()})
return
}
// Process the request and payment based on the proxy type
switch p.kind {
case CallProxy:
// Make sure the consumer authorized the payment for this call
consumer, provider := common.HexToAddress(auth.Consumer), common.HexToAddress(auth.Provider)
if !p.verifier.Exists(consumer, provider) {
p.fail(w, &verification{Unknown: true, Error: "Non existent API subscription"})
return
}
nonce := p.verifier.Nonce(consumer, provider).Uint64()
if auth.Nonce != nonce {
p.fail(w, &verification{Error: "Invalid nonce", Nonce: nonce})
return
}
valid, funded := p.verifier.Verify(consumer, provider, auth.Nonce, new(big.Int).SetUint64(auth.Amount), common.FromHex(auth.Signature))
if !valid {
p.fail(w, &verification{Error: "Invalid authorization signature"})
return
}
if !funded {
p.fail(w, &verification{Error: "Not enough funds available"})
return
}
price := p.verifier.Price(consumer, provider).Uint64()
if prev := p.vault.Fetch(provider, consumer); prev != nil && prev.Amount+price > auth.Amount {
p.fail(w, &verification{
Error: "Not enough funds authorized",
Authorized: prev.Amount,
Proof: prev.Signature,
Need: prev.Amount + price,
})
return
}
p.vault.Store(auth)
// Execute the API internally and proxy the response
reqLogger.Debug("Payment accepted for API invocation")
res, err := p.service(r)
if err != nil {
reqLogger.Error("Failed to process API request", "error", err)
http.Error(w, "Failed to execute request", http.StatusInternalServerError)
return
}
defer res.Body.Close()
p.forward(w, res)
case DataProxy:
// Since we're paying by the data, retrieve the amount first
res, err := p.service(r)
if err != nil {
reqLogger.Error("Failed to process API request", "error", err)
http.Error(w, "Failed to execute request", http.StatusInternalServerError)
return
}
defer res.Body.Close()
// Make sure the user authorized payment for all the requested data
data := res.ContentLength
if data > 0 /* TODO */ {
reqLogger.Debug("Payment accepted for API stream", "data", data)
p.forward(w, res)
}
}
}
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
}
}
// WriteGenesisBlock writes the genesis block to the database as block number 0
func WriteGenesisBlock(chainDb ethdb.Database, reader io.Reader) (*types.Block, error) {
contents, err := ioutil.ReadAll(reader)
if err != nil {
return nil, err
}
var genesis struct {
Nonce string
Timestamp string
ParentHash string
ExtraData string
GasLimit string
Difficulty string
Mixhash string
Coinbase string
Alloc map[string]struct {
Code string
Storage map[string]string
Balance string
}
}
if err := json.Unmarshal(contents, &genesis); err != nil {
return nil, err
}
// creating with empty hash always works
statedb, _ := state.New(common.Hash{}, chainDb)
for addr, account := range genesis.Alloc {
address := common.HexToAddress(addr)
statedb.AddBalance(address, common.String2Big(account.Balance))
statedb.SetCode(address, common.Hex2Bytes(account.Code))
for key, value := range account.Storage {
statedb.SetState(address, common.HexToHash(key), common.HexToHash(value))
}
}
root, stateBatch := statedb.CommitBatch()
difficulty := common.String2Big(genesis.Difficulty)
block := types.NewBlock(&types.Header{
Nonce: types.EncodeNonce(common.String2Big(genesis.Nonce).Uint64()),
Time: common.String2Big(genesis.Timestamp),
ParentHash: common.HexToHash(genesis.ParentHash),
Extra: common.FromHex(genesis.ExtraData),
GasLimit: common.String2Big(genesis.GasLimit),
Difficulty: difficulty,
MixDigest: common.HexToHash(genesis.Mixhash),
Coinbase: common.HexToAddress(genesis.Coinbase),
Root: root,
}, nil, nil, nil)
if block := GetBlock(chainDb, block.Hash()); block != nil {
glog.V(logger.Info).Infoln("Genesis block already in chain. Writing canonical number")
err := WriteCanonicalHash(chainDb, block.Hash(), block.NumberU64())
if err != nil {
return nil, err
}
return block, nil
}
if err := stateBatch.Write(); err != nil {
return nil, fmt.Errorf("cannot write state: %v", err)
}
if err := WriteTd(chainDb, block.Hash(), difficulty); err != nil {
return nil, err
}
if err := WriteBlock(chainDb, block); err != nil {
return nil, err
}
if err := WriteBlockReceipts(chainDb, block.Hash(), nil); err != nil {
return nil, err
}
if err := WriteCanonicalHash(chainDb, block.Hash(), block.NumberU64()); err != nil {
return nil, err
}
if err := WriteHeadBlockHash(chainDb, block.Hash()); err != nil {
return nil, err
}
return block, nil
}
// Transact forms a transaction from the given arguments and submits it to the
// transactio pool for execution.
func (be *registryAPIBackend) Transact(fromStr, toStr, nonceStr, valueStr, gasStr, gasPriceStr, codeStr string) (string, error) {
if len(toStr) > 0 && toStr != "0x" && !common.IsHexAddress(toStr) {
return "", errors.New("invalid address")
}
var (
from = common.HexToAddress(fromStr)
to = common.HexToAddress(toStr)
value = common.Big(valueStr)
gas *big.Int
price *big.Int
data []byte
contractCreation bool
)
if len(gasStr) == 0 {
gas = big.NewInt(90000)
} else {
gas = common.Big(gasStr)
}
if len(gasPriceStr) == 0 {
price = big.NewInt(10000000000000)
} else {
price = common.Big(gasPriceStr)
}
data = common.FromHex(codeStr)
if len(toStr) == 0 {
contractCreation = true
}
nonce := be.txPool.State().GetNonce(from)
if len(nonceStr) != 0 {
nonce = common.Big(nonceStr).Uint64()
}
var tx *types.Transaction
if contractCreation {
tx = types.NewContractCreation(nonce, value, gas, price, data)
} else {
tx = types.NewTransaction(nonce, to, value, gas, price, data)
}
acc := accounts.Account{from}
signature, err := be.am.Sign(acc, tx.SigHash().Bytes())
if err != nil {
return "", err
}
signedTx, err := tx.WithSignature(signature)
if err != nil {
return "", err
}
be.txPool.SetLocal(signedTx)
if err := be.txPool.Add(signedTx); err != nil {
return "", nil
}
if contractCreation {
addr := crypto.CreateAddress(from, nonce)
glog.V(logger.Info).Infof("Tx(%s) created: %s\n", signedTx.Hash().Hex(), addr.Hex())
} else {
glog.V(logger.Info).Infof("Tx(%s) to: %s\n", signedTx.Hash().Hex(), tx.To().Hex())
}
return signedTx.Hash().Hex(), nil
}
"strings"
"sync"
"github.com/gophergala2016/etherapis/etherapis/Godeps/_workspace/src/github.com/ethereum/go-ethereum/accounts/abi"
"github.com/gophergala2016/etherapis/etherapis/Godeps/_workspace/src/github.com/ethereum/go-ethereum/common"
"github.com/gophergala2016/etherapis/etherapis/Godeps/_workspace/src/github.com/ethereum/go-ethereum/core"
"github.com/gophergala2016/etherapis/etherapis/Godeps/_workspace/src/github.com/ethereum/go-ethereum/core/types"
"github.com/gophergala2016/etherapis/etherapis/Godeps/_workspace/src/github.com/ethereum/go-ethereum/core/vm"
"github.com/gophergala2016/etherapis/etherapis/Godeps/_workspace/src/github.com/ethereum/go-ethereum/crypto"
"github.com/gophergala2016/etherapis/etherapis/Godeps/_workspace/src/github.com/ethereum/go-ethereum/eth/filters"
"github.com/gophergala2016/etherapis/etherapis/Godeps/_workspace/src/github.com/ethereum/go-ethereum/ethdb"
"github.com/gophergala2016/etherapis/etherapis/Godeps/_workspace/src/github.com/ethereum/go-ethereum/event"
)
// contractAddress is the static address on which the contract resides
var contractAddress = common.HexToAddress("0x8e517c8f4cc7714ef4723d0b70205c53d264c142")
// signFn is a signer function callback when the contract requires a method to
// sign the transaction before submission.
type signFn func(*types.Transaction) (*types.Transaction, error)
// Channels is the channels contract reflecting that on the ethereum network. The
// channels contract handles all validation and verifications of payments and
// allows you to redeem cheques.
//
// Channels implements the proxy.Verifier and proxy.Charges interfaces.
type Channels struct {
abi abi.ABI
blockchain *core.BlockChain
filters *filters.FilterSystem
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package core
import (
"math/big"
"github.com/gophergala2016/etherapis/etherapis/Godeps/_workspace/src/github.com/ethereum/go-ethereum/common"
"github.com/gophergala2016/etherapis/etherapis/Godeps/_workspace/src/github.com/ethereum/go-ethereum/core/state"
)
var (
jeff = common.HexToAddress("959c33de5961820567930eccce51ea715c496f85")
vitalik = common.HexToAddress("c8158da0b567a8cc898991c2c2a073af67dc03a9")
christoph = common.HexToAddress("7a19a893f91d5b6e2cdf941b6acbba2cbcf431ee")
gav = common.HexToAddress("539dd9aaf45c3feb03f9c004f4098bd3268fef6b")
)
// Canary will check the 0'd address of the 4 contracts above.
// If two or more are set to anything other than a 0 the canary
// dies a horrible death.
func Canary(statedb *state.StateDB) bool {
var r int
if (statedb.GetState(jeff, common.Hash{}).Big().Cmp(big.NewInt(0)) > 0) {
r++
}
if (statedb.GetState(gav, common.Hash{}).Big().Cmp(big.NewInt(0)) > 0) {
r++