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dex_wallets_loader.go
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dex_wallets_loader.go
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package libwallet
import (
"fmt"
"strconv"
"strings"
"sync"
"decred.org/dcrdex/client/asset"
"decred.org/dcrdex/dex"
"github.com/crypto-power/cryptopower/dexc"
"github.com/crypto-power/cryptopower/libwallet/assets/btc"
"github.com/crypto-power/cryptopower/libwallet/assets/dcr"
"github.com/crypto-power/cryptopower/libwallet/assets/ltc"
dexbtc "decred.org/dcrdex/client/asset/btc"
dexDcr "decred.org/dcrdex/client/asset/dcr"
dexltc "decred.org/dcrdex/client/asset/ltc"
btccfg "github.com/btcsuite/btcd/chaincfg"
sharedW "github.com/crypto-power/cryptopower/libwallet/assets/wallet"
dcrcfg "github.com/decred/dcrd/chaincfg/v3"
)
var (
dexWalletLoaderMtx sync.RWMutex
dexWalletLoader func(walletID int) sharedW.Asset
)
func init() {
prepareDexSupportForDCRWallet()
prepareDexSupportForBTCCloneWallets()
}
func setDEXWalletLoader(fn func(walletID int) sharedW.Asset) {
dexWalletLoaderMtx.Lock()
defer dexWalletLoaderMtx.Unlock()
dexWalletLoader = fn
}
func loadWalletForDEX(walletID int) sharedW.Asset {
dexWalletLoaderMtx.RLock()
defer dexWalletLoaderMtx.RUnlock()
if dexWalletLoader == nil {
return nil
}
return dexWalletLoader(walletID)
}
// prepareDexSupportForDCRWallet sets up the DEX client to allow using a
// cyptopower dcr wallet with DEX core.
func prepareDexSupportForDCRWallet() {
// Build a custom wallet definition with custom config options
// for use by the dex dcr ExchangeWallet.
customWalletConfigOpts := []*asset.ConfigOption{
{
Key: dexc.WalletIDConfigKey,
DisplayName: "Wallet ID",
Description: "ID of existing wallet to use",
},
{
Key: dexc.WalletAccountNumberConfigKey,
DisplayName: "Wallet Account Number",
Description: "Account number of the selected wallet",
},
}
def := &asset.WalletDefinition{
Type: dexc.CustomDexWalletType,
Description: "Uses an existing cryptopower Wallet.",
ConfigOpts: customWalletConfigOpts,
}
// This function will be invoked when the DEX client needs to
// setup a dcr ExchangeWallet; it allows us to use an existing
// wallet instance for wallet operations instead of json-rpc.
var walletMaker = func(settings map[string]string, chainParams *dcrcfg.Params, logger dex.Logger) (dexDcr.Wallet, error) {
walletIDStr := settings[dexc.WalletIDConfigKey]
walletID, err := strconv.Atoi(walletIDStr)
if err != nil || walletID < 0 {
return nil, fmt.Errorf("invalid wallet ID %q in settings", walletIDStr)
}
wallet := loadWalletForDEX(walletID)
if wallet == nil {
return nil, fmt.Errorf("no wallet exists with ID %q", walletIDStr)
}
dcrWallet := wallet.Internal().DCR
walletParams := dcrWallet.ChainParams()
if walletParams.Net != chainParams.Net {
return nil, fmt.Errorf("selected wallet is for %s network, expected %s", walletParams.Name, chainParams.Name)
}
if wallet.IsWatchingOnlyWallet() {
return nil, fmt.Errorf("cannot use watch only wallet for DEX trade")
}
// Ensure the account exists.
accountNumberStr := settings[dexc.WalletAccountNumberConfigKey]
acctNum, err := strconv.ParseInt(accountNumberStr, 10, 64)
if err != nil {
return nil, err
}
accountNumber := int32(acctNum)
if _, err = wallet.AccountName(accountNumber); err != nil {
return nil, fmt.Errorf("error checking selected DEX account: %w", err)
}
dcrAsset, ok := wallet.(*dcr.Asset)
if !ok {
return nil, fmt.Errorf("DEX wallet not supported for %s", walletParams.Name)
}
return dcr.NewDEXWallet(dcrWallet, dcrAsset, accountNumber, dcrAsset.SyncData()), nil
}
dexDcr.RegisterCustomWallet(walletMaker, def)
}
// prepareDexSupportForBTCCloneWallets sets up the DEX client to allow using a
// Cyptopower btc or ltc wallet with DEX core.
func prepareDexSupportForBTCCloneWallets() {
// Build a custom wallet definition with custom config options for use by
// the dexbtc.ExchangeWalletSPV.
customWalletConfigOpts := []*asset.ConfigOption{
{
Key: dexc.WalletIDConfigKey,
DisplayName: "Wallet ID",
Description: "ID of existing wallet to use",
},
{
Key: dexc.WalletAccountNumberConfigKey,
DisplayName: "Wallet Account Number",
Description: "Account number of the selected wallet",
},
}
def := &asset.WalletDefinition{
Type: dexc.CustomDexWalletType,
Description: "Uses an existing cryptopower Wallet.",
ConfigOpts: customWalletConfigOpts,
}
// Register wallet constructors. The constructor function will be invoked
// when the DEX client needs to setup a dexbtc.BTCWallet and this allows us
// to use an existing wallet instance for wallet operations.
btcWalletConstructor := func(settings map[string]string, chainParams *btccfg.Params) (dexbtc.BTCWallet, error) {
return btcCloneWalletConstructor(false, settings, chainParams)
}
dexbtc.RegisterCustomSPVWallet(btcWalletConstructor, def)
ltcWalletConstructor := func(settings map[string]string, chainParams *btccfg.Params) (dexbtc.BTCWallet, error) {
return btcCloneWalletConstructor(true, settings, chainParams)
}
dexltc.RegisterCustomSPVWallet(ltcWalletConstructor, def)
}
// btcCloneWalletConstructor is a shared wallet constructor used by btc and ltc
// to create dex compatible wallets.
func btcCloneWalletConstructor(isLtc bool, settings map[string]string, chainParams *btccfg.Params) (dexbtc.BTCWallet, error) {
walletIDStr := settings[dexc.WalletIDConfigKey]
walletID, err := strconv.Atoi(walletIDStr)
if err != nil || walletID < 0 {
return nil, fmt.Errorf("invalid wallet ID %q in settings", walletIDStr)
}
wallet := loadWalletForDEX(walletID)
if wallet == nil {
return nil, fmt.Errorf("no wallet exists with ID %q", walletIDStr)
}
if isLtc {
if walletParams := wallet.Internal().LTC.ChainParams(); !strings.EqualFold(walletParams.Name, chainParams.Name) {
return nil, fmt.Errorf("selected wallet is for %s network, expected %s", walletParams.Name, chainParams.Name)
}
} else {
if walletParams := wallet.Internal().BTC.ChainParams(); walletParams.Net != chainParams.Net {
return nil, fmt.Errorf("selected wallet is for %s network, expected %s", walletParams.Name, chainParams.Name)
}
}
if wallet.IsWatchingOnlyWallet() {
return nil, fmt.Errorf("cannot use watch only wallet for DEX trade")
}
// Ensure the wallet account exists.
accountNumberStr := settings[dexc.WalletAccountNumberConfigKey]
acctNum, err := strconv.ParseInt(accountNumberStr, 10, 64)
if err != nil {
return nil, err
}
accountNumber := int32(acctNum)
if _, err = wallet.AccountName(accountNumber); err != nil {
return nil, fmt.Errorf("error checking selected DEX account name: %w", err)
}
if isLtc {
return ltc.NewDEXWallet(wallet.Internal().LTC, accountNumber, wallet.(*ltc.Asset).NeutrinoClient(), chainParams), nil
}
return btc.NewDEXWallet(wallet.Internal().BTC, accountNumber, wallet.(*btc.Asset).NeutrinoClient()), nil
}