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account_configurator.go
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account_configurator.go
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package stellar
import (
"net/http"
"time"
"github.com/stellar/go/clients/horizon"
"github.com/stellar/go/keypair"
"github.com/stellar/go/services/bifrost/common"
"github.com/stellar/go/support/errors"
"github.com/stellar/go/support/log"
)
func (ac *AccountConfigurator) Start() error {
ac.log = common.CreateLogger("StellarAccountConfigurator")
ac.log.Info("StellarAccountConfigurator starting")
_, err := keypair.Parse(ac.IssuerPublicKey)
if err != nil || (err == nil && ac.IssuerPublicKey[0] != 'G') {
err = errors.Wrap(err, "Invalid IssuerPublicKey")
ac.log.Error(err)
return err
}
_, err = keypair.Parse(ac.DistributionPublicKey)
if err != nil || (err == nil && ac.DistributionPublicKey[0] != 'G') {
err = errors.Wrap(err, "Invalid DistributionPublicKey")
ac.log.Error(err)
return err
}
kp, err := keypair.Parse(ac.SignerSecretKey)
if err != nil || (err == nil && ac.SignerSecretKey[0] != 'S') {
err = errors.Wrap(err, "Invalid SignerSecretKey")
ac.log.Error(err)
return err
}
ac.signerPublicKey = kp.Address()
root, err := ac.Horizon.Root()
if err != nil {
err = errors.Wrap(err, "Error loading Horizon root")
ac.log.Error(err)
return err
}
if root.NetworkPassphrase != ac.NetworkPassphrase {
return errors.Errorf("Invalid network passphrase (have=%s, want=%s)", root.NetworkPassphrase, ac.NetworkPassphrase)
}
err = ac.updateSignerSequence()
if err != nil {
err = errors.Wrap(err, "Error loading issuer sequence number")
ac.log.Error(err)
return err
}
ac.accountStatus = make(map[string]Status)
go ac.logStats()
return nil
}
func (ac *AccountConfigurator) logStats() {
for {
ac.log.WithField("statuses", ac.accountStatus).Info("Stats")
time.Sleep(15 * time.Second)
}
}
// ConfigureAccount configures a new account that participated in ICO.
// * First it creates a new account.
// * Once a signer is replaced on the account, it creates trust lines and exchanges assets.
func (ac *AccountConfigurator) ConfigureAccount(destination, assetCode, amount string) {
localLog := ac.log.WithFields(log.F{
"destination": destination,
"assetCode": assetCode,
"amount": amount,
})
localLog.Info("Configuring Stellar account")
ac.setAccountStatus(destination, StatusCreatingAccount)
defer func() {
ac.removeAccountStatus(destination)
}()
// Check if account exists. If it is, skip creating it.
for {
_, exists, err := ac.getAccount(destination)
if err != nil {
localLog.WithField("err", err).Error("Error loading account from Horizon")
time.Sleep(2 * time.Second)
continue
}
if exists {
break
}
localLog.WithField("destination", destination).Info("Creating Stellar account")
err = ac.createAccountTransaction(destination)
if err != nil {
localLog.WithField("err", err).Error("Error creating Stellar account")
time.Sleep(2 * time.Second)
continue
}
break
}
if ac.OnAccountCreated != nil {
ac.OnAccountCreated(destination)
}
ac.setAccountStatus(destination, StatusWaitingForSigner)
// Wait for signer changes...
for {
account, err := ac.Horizon.LoadAccount(destination)
if err != nil {
localLog.WithField("err", err).Error("Error loading account to check trustline")
time.Sleep(2 * time.Second)
continue
}
if ac.signerExistsOnly(account) {
break
}
time.Sleep(2 * time.Second)
}
localLog.Info("Signer found")
ac.setAccountStatus(destination, StatusConfiguringAccount)
// When signer was created we can configure account in Bifrost without requiring
// the user to share the account's secret key.
localLog.Info("Sending token")
err := ac.configureAccountTransaction(destination, assetCode, amount, ac.NeedsAuthorize)
if err != nil {
localLog.WithField("err", err).Error("Error configuring an account")
return
}
ac.setAccountStatus(destination, StatusRemovingSigner)
if ac.LockUnixTimestamp == 0 {
localLog.Info("Removing temporary signer")
err = ac.removeTemporarySigner(destination)
if err != nil {
localLog.WithField("err", err).Error("Error removing temporary signer")
return
}
if ac.OnExchanged != nil {
ac.OnExchanged(destination)
}
} else {
localLog.Info("Creating unlock transaction to remove temporary signer")
transaction, err := ac.buildUnlockAccountTransaction(destination)
if err != nil {
localLog.WithField("err", err).Error("Error creating unlock transaction")
return
}
if ac.OnExchangedTimelocked != nil {
ac.OnExchangedTimelocked(destination, transaction)
}
}
localLog.Info("Account successully configured")
}
func (ac *AccountConfigurator) setAccountStatus(account string, status Status) {
ac.accountStatusMutex.Lock()
defer ac.accountStatusMutex.Unlock()
ac.accountStatus[account] = status
}
func (ac *AccountConfigurator) removeAccountStatus(account string) {
ac.accountStatusMutex.Lock()
defer ac.accountStatusMutex.Unlock()
delete(ac.accountStatus, account)
}
func (ac *AccountConfigurator) getAccount(account string) (horizon.Account, bool, error) {
var hAccount horizon.Account
hAccount, err := ac.Horizon.LoadAccount(account)
if err != nil {
if err, ok := err.(*horizon.Error); ok && err.Response.StatusCode == http.StatusNotFound {
return hAccount, false, nil
}
return hAccount, false, err
}
return hAccount, true, nil
}
// signerExistsOnly returns true if account has exactly one signer and it's
// equal to `signerPublicKey`.
func (ac *AccountConfigurator) signerExistsOnly(account horizon.Account) bool {
tempSignerFound := false
for _, signer := range account.Signers {
if signer.PublicKey == ac.signerPublicKey {
if signer.Weight == 1 {
tempSignerFound = true
}
} else {
// For each other signer, weight should be equal 0
if signer.Weight != 0 {
return false
}
}
}
return tempSignerFound
}