Version: v0.5.6 Latest Latest

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Published: Nov 15, 2022 License: BlueOak-1.0.0 Imports: 5 Imported by: 4




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const (
	// ErrSwapNotInitiated most likely means that a swap using a contract has
	// not yet been mined. There is no guarantee that the swap will be mined
	// in the future.
	ErrSwapNotInitiated = dex.ErrorKind("swap not yet initiated")
	CoinNotFoundError   = dex.ErrorKind("coin not found")
	ErrRequestTimeout   = dex.ErrorKind("request timeout")
	ErrConnectionDown   = dex.ErrorKind("wallet not connected")
	ErrNotImplemented   = dex.ErrorKind("not implemented")
	ErrUnsupported      = dex.ErrorKind("unsupported")

	// InternalNodeLoggerName is the name for a logger that is used to fine
	// tune log levels for only loggers using this name.
	InternalNodeLoggerName = "INTL"

CoinNotFoundError is returned when a coin cannot be found, either because it has been spent or it never existed. This error may be returned from AuditContract, Refund or Redeem as those methods expect the provided coin to exist and be unspent.

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const (
	// SpecialSettingActivelyUsed is a special setting that can be injected by
	// core that lets the wallet know that it is being actively used. A use
	// case is by the bitcoin SPV wallet to decide whether or not it is safe
	// to do a full rescan.
	SpecialSettingActivelyUsed = "special_activelyUsed"


This section is empty.


func Assets

func Assets() map[uint32]RegisteredAsset

Assets returns a list of information about supported assets.

func CreateWallet added in v0.4.0

func CreateWallet(assetID uint32, seedParams *CreateWalletParams) error

CreateWallet creates a new wallet. Only use Create for seeded wallet types.

func DecodeCoinID

func DecodeCoinID(assetID uint32, coinID []byte) (cid string, err error)

DecodeCoinID creates a human-readable representation of a coin ID for a named asset with a corresponding driver registered with this package.

func Register

func Register(assetID uint32, driver Driver)

Register should be called by the init function of an asset's package.

func RegisterToken added in v0.5.0

func RegisterToken(tokenID uint32, token *dex.Token, walletDef *WalletDefinition)

RegisterToken should be called to register tokens.

func UnitInfo added in v0.5.0

func UnitInfo(assetID uint32) (dex.UnitInfo, error)

UnitInfo returns the dex.UnitInfo for the asset or token.

func WalletExists added in v0.4.0

func WalletExists(assetID uint32, walletType, dataDir string, settings map[string]string, net dex.Network) (exists bool, err error)

WalletExists will be true if the specified wallet exists.


type Accelerator added in v0.5.0

type Accelerator interface {
	// AccelerateOrder uses the Child-Pays-For-Parent technique to accelerate a
	// chain of swap transactions and previous accelerations. It broadcasts a new
	// transaction with a fee high enough so that the average fee of all the
	// unconfirmed transactions in the chain and the new transaction will have
	// an average fee rate of newFeeRate. The changeCoin argument is the latest
	// change in the order. It must be the input in the acceleration transaction
	// in order for the order to be accelerated. requiredForRemainingSwaps is the
	// amount of funds required to complete the rest of the swaps in the order.
	// The change output of the acceleration transaction will have at least
	// this amount.
	// The returned change coin may be nil, and should be checked before use.
	AccelerateOrder(swapCoins, accelerationCoins []dex.Bytes, changeCoin dex.Bytes, requiredForRemainingSwaps, newFeeRate uint64) (Coin, string, error)
	// AccelerationEstimate takes the same parameters as AccelerateOrder, but
	// instead of broadcasting the acceleration transaction, it just returns
	// the amount of funds that will need to be spent in order to increase the
	// average fee rate to the desired amount.
	AccelerationEstimate(swapCoins, accelerationCoins []dex.Bytes, changeCoin dex.Bytes, requiredForRemainingSwaps, newFeeRate uint64) (uint64, error)
	// PreAccelerate returns the current average fee rate of the unmined swap
	// initiation and acceleration transactions, and also returns a suggested
	// range that the fee rate should be increased to in order to expedite mining.
	// The feeSuggestion argument is the current prevailing network rate. It is
	// used to help determine the suggestedRange, which is a range meant to give
	// the user a good amount of flexibility in determining the post acceleration
	// effective fee rate, but still not allowing them to pick something
	// outrageously high.
	PreAccelerate(swapCoins, accelerationCoins []dex.Bytes, changeCoin dex.Bytes, requiredForRemainingSwaps, feeSuggestion uint64) (uint64, *XYRange, *EarlyAcceleration, error)

Accelerator is implemented by wallets which support acceleration of the mining of swap transactions.

type AccountLocker added in v0.5.0

type AccountLocker interface {
	// ReserveNRedemption is used when preparing funding for an order that
	// redeems to an account-based asset. The wallet will set aside the
	// appropriate amount of funds so that we can redeem N swaps using the fee
	// and version configuration specified in the dex.Asset. It is an error to
	// request funds > spendable balance.
	ReserveNRedemptions(n uint64, dexRedeemCfg *dex.Asset) (uint64, error)
	// ReReserveRedemption is used when reconstructing existing orders on
	// startup. It is an error to request funds > spendable balance.
	ReReserveRedemption(amt uint64) error
	// UnlockRedemptionReserves is used to return funds reserved for redemption
	// when an order is canceled or otherwise completed unfilled.
	// ReserveNRefunds is used when preparing funding for an order that refunds
	// to an account-based asset. The wallet will set aside the appropriate
	// amount of funds so that we can refund N swaps using the fee and version
	// configuration specified in the dex.Asset. It is an error to request funds
	// > spendable balance.
	ReserveNRefunds(n uint64, dexSwapCfg *dex.Asset) (uint64, error)
	// ReReserveRefund is used when reconstructing existing orders on
	// startup. It is an error to request funds > spendable balance.
	ReReserveRefund(uint64) error
	// UnlockRefundReserves is used to return funds reserved for refunds
	// when an order was cancelled or revoked before a swap was initiated,
	// completed successully, or after a refund was done.

AccountLocker is a wallet in which redemptions and refunds require a wallet to have available balance to pay fees.

type AuditInfo

type AuditInfo struct {
	// Recipient is the string-encoded recipient address.
	Recipient string
	// Expiration is the unix timestamp of the contract time lock expiration.
	Expiration time.Time
	// Coin is the coin that contains the contract.
	Coin Coin
	// Contract is the unique swap contract data. This may be a redeem script
	// for UTXO assets, or other information that uniquely identifies the swap
	// for account-based assets e.g. a contract version and secret hash for ETH.
	Contract dex.Bytes
	// SecretHash is the contract's secret hash. This is likely to be encoded in
	// the Contract field, which is often the redeem script or an asset-specific
	// encoding of the unique swap data.
	SecretHash dex.Bytes

AuditInfo is audit information about a swap contract needed to audit the contract.

type Balance

type Balance struct {
	// Available is the balance that is available for trading immediately.
	Available uint64 `json:"available"`
	// Immature is the balance that is not ready, but will be after some
	// confirmations.
	Immature uint64 `json:"immature"`
	// Locked is the total amount locked in the wallet which includes but
	// is not limited to funds locked for swap but not actually swapped yet.
	Locked uint64 `json:"locked"`

Balance is categorized information about a wallet's balance.

type BooleanConfig added in v0.5.0

type BooleanConfig struct {
	// Reason should summarize the difference between on/off states.
	Reason string `json:"reason"`

BooleanConfig is set in a SwapOption to indicate that an options is a simple boolean.

type Coin

type Coin interface {
	// ID is a unique identifier for this coin.
	ID() dex.Bytes
	// String is a string representation of the coin.
	String() string
	// Value is the available quantity, in atoms/satoshi.
	Value() uint64

Coin is some amount of spendable asset. Coin provides the information needed to locate the unspent value on the blockchain.

type Coins

type Coins []Coin

Coins a collection of coins as returned by Fund.

type ConfigOption

type ConfigOption struct {
	Key          string      `json:"key"`
	DisplayName  string      `json:"displayname"`
	Description  string      `json:"description"`
	DefaultValue interface{} `json:"default"`
	// If MaxValue/MinValue are set to the string "now" for a date config, the
	// UI will display the current date.
	MaxValue          interface{} `json:"max"`
	MinValue          interface{} `json:"min"`
	NoEcho            bool        `json:"noecho"`
	IsBoolean         bool        `json:"isboolean"`
	IsDate            bool        `json:"isdate"`
	DisableWhenActive bool        `json:"disablewhenactive"`
	IsBirthdayConfig  bool        `json:"isBirthdayConfig"`

ConfigOption is a wallet configuration option.

type Contract

type Contract struct {
	// Address is the receiving address.
	Address string
	// Value is the amount being traded.
	Value uint64
	// SecretHash is the hash of the secret key.
	SecretHash dex.Bytes
	// LockTime is the contract lock time in UNIX seconds.
	LockTime uint64

Contract is a swap contract.

type CreateWalletParams added in v0.4.0

type CreateWalletParams struct {
	Type     string
	Seed     []byte
	Pass     []byte
	Settings map[string]string
	DataDir  string
	Net      dex.Network
	Logger   dex.Logger

CreateWalletParams are the parameters for internal wallet creation. The Settings provided should be the same wallet configuration settings passed to OpenWallet.

type Creator added in v0.4.0

type Creator interface {
	Exists(walletType, dataDir string, settings map[string]string, net dex.Network) (bool, error)
	Create(*CreateWalletParams) error

Creator defines methods for Drivers that will be called to initialize seeded wallets during CreateWallet. Only assets that provide seeded wallets need to implement Creator.

type Driver

type Driver interface {
	Open(*WalletConfig, dex.Logger, dex.Network) (Wallet, error)
	DecodeCoinID(coinID []byte) (string, error)
	Info() *WalletInfo

Driver is the interface required of all exchange wallets.

type EarlyAcceleration added in v0.5.0

type EarlyAcceleration struct {
	// TimePast is the amount of seconds that has past since either the previous
	// acceleration, or the oldest unmined swap transaction was submitted to
	// the blockchain.
	TimePast uint64 `json:"timePast"`
	// WasAccelerated is true if the action that took place TimePast seconds
	// ago was an acceleration. If false, the oldest unmined swap transaction
	// in the order was submitted TimePast seconds ago.
	WasAccelerated bool `json:"wasAccelerated"`

EarlyAcceleration is returned from the PreAccelerate function to inform the user that either their last acceleration or oldest swap transaction happened very recently, and that they should double check that they really want to do an acceleration.

type FeeRater added in v0.4.3

type FeeRater interface {
	FeeRate() uint64

FeeRater is capable of retrieving a non-critical fee rate estimate for an asset. Some SPV wallets, for example, cannot provide a fee rate estimate, so shouldn't implement FeeRater. However, since the mode of external wallets may not be known on construction, only connect, a zero rate may be returned. The caller should always check for zero and have a fallback rate. The rates from FeeRate should be used for rates that are not validated by the server Withdraw and Send, and will/should not be used to generate a fee suggestion for swap operations.

type LiveReconfigurer added in v0.5.0

type LiveReconfigurer interface {
	// Reconfigure attempts to reconfigure the wallet. If reconfiguration
	// requires a restart, the Wallet should still validate as much
	// configuration as possible.
	Reconfigure(ctx context.Context, cfg *WalletConfig, currentAddress string) (restartRequired bool, err error)

LiveReconfigurer is a wallet that can possibly handle a reconfiguration without the need for re-initialization.

type LogFiler added in v0.4.1

type LogFiler interface {
	LogFilePath() string

LogFiler is a wallet that allows for downloading of its log file.

type MaxOrderForm added in v0.5.0

type MaxOrderForm struct {
	LotSize       uint64
	FeeSuggestion uint64
	AssetConfig   *dex.Asset
	RedeemConfig  *dex.Asset

MaxOrderForm is used to get a SwapEstimate from the Wallet's MaxOrder method.

type NewAddresser added in v0.4.1

type NewAddresser interface {
	NewAddress() (string, error)

NewAddresser is a wallet that can generate new deposit addresses.

type Order

type Order struct {
	// Value is the amount required to satisfy the order. The Value does not
	// include fees. Fees will be calculated internally based on the number of
	// possible swaps (MaxSwapCount) and the exchange's configuration
	// (DEXConfig).
	Value uint64
	// MaxSwapCount is the number of lots in the order, which is also the
	// maximum number of transaction that an order could potentially generate
	// in a worst-case scenario of all 1-lot matches. Note that if requesting
	// funding for the quote asset's wallet, the number of lots will not be
	// Value / DEXConfig.LotSize, because an order is quantified in the base
	// asset, so lots is always (order quantity) / (base asset lot size).
	MaxSwapCount uint64 // uint64 for compatibility with quantity and lot size.
	// DEXConfig holds values specific to and provided by a particular server.
	// Info about fee rates and swap transaction sizes is used internally to
	// calculate the funding required to cover fees.
	DEXConfig    *dex.Asset
	RedeemConfig *dex.Asset
	// Immediate should be set to true if this is for an order that is not a
	// standing order, likely a market order or a limit order with immediate
	// time-in-force.
	Immediate bool
	// FeeSuggestion is a suggested fee from the server. If a split transaction
	// is used, the fee rate used should be at least the suggested fee, else
	// zero-conf coins might be rejected.
	FeeSuggestion uint64
	// Options are options that corresponds to PreSwap.Options, as well as
	// their values.
	Options map[string]string

Order is order details needed for FundOrder.

type OrderOption added in v0.5.0

type OrderOption struct {

	// Boolean is a boolean option with two custom labels.
	Boolean *BooleanConfig `json:"boolean,omitempty"`
	// Range indicates a numeric input where the user can adjust the value
	// between a pre-defined low and high.
	XYRange *XYRange `json:"xyRange,omitempty"`

OrderOption is an available option for an order.

type PreRedeem added in v0.2.0

type PreRedeem struct {
	Estimate *RedeemEstimate `json:"estimate"`
	Options  []*OrderOption  `json:"options"`

PreRedeem is an estimate of the fees for redemption. The struct will be expanded in in-progress work to accommodate order-time options.

type PreRedeemForm added in v0.2.0

type PreRedeemForm struct {
	// Lots is the number of lots in the order.
	Lots uint64
	// FeeSuggestion is a suggested fee from the server.
	FeeSuggestion uint64
	// SelectedOptions is any options that the user has selected.
	SelectedOptions map[string]string
	// AssetConfig is the dex's asset configuration info.
	AssetConfig *dex.Asset

PreRedeemForm can be used to get a redemption estimate.

type PreSwap added in v0.2.0

type PreSwap struct {
	Estimate *SwapEstimate  `json:"estimate"`
	Options  []*OrderOption `json:"options"`

PreSwap is a SwapEstimate returned from Wallet.PreSwap. The struct will be expanded in in-progress work to accommodate order-time options.

type PreSwapForm added in v0.2.0

type PreSwapForm struct {
	// LotSize is the lot size for the calculation. For quote assets, LotSize
	// should be based on either the user's limit order rate, or some measure
	// of the current market rate.
	LotSize uint64
	// Lots is the number of lots in the order.
	Lots uint64
	// AssetConfig is the dex's asset configuration info.
	AssetConfig *dex.Asset
	// RedeemConfig is the dex's asset configuration info for the redemption
	// asset.
	RedeemConfig *dex.Asset
	// Immediate should be set to true if this is for an order that is not a
	// standing order, likely a market order or a limit order with immediate
	// time-in-force.
	Immediate bool
	// FeeSuggestion is a suggested fee from the server. If a split transaction
	// is used, the fee rate used should be at least the suggested fee, else
	// zero-conf coins might be rejected.
	FeeSuggestion uint64
	// SelectedOptions is any options that the user has selected. The available
	// PreOrder options and values can be inter-dependent, so when a user
	// selects an option, a new PreOrder can be generated to updated the
	// options available and recalculate the effects.
	SelectedOptions map[string]string

PreSwapForm can be used to get a swap fees estimate.

type Receipt

type Receipt interface {
	// Expiration is the time lock expiration.
	Expiration() time.Time
	// Coin is the swap initiation transaction's Coin.
	Coin() Coin
	// Contract is the unique swap contract data. This may be a redeem script
	// for UTXO assets, or other information that uniquely identifies the swap
	// for account-based assets e.g. a contract version and secret hash for ETH.
	Contract() dex.Bytes
	// String provides a human-readable representation of the swap that may
	// provide supplementary data to locate the swap.
	String() string
	// SignedRefund is a signed refund script that can be used to return
	// funds to the user in the case a contract expires.
	SignedRefund() dex.Bytes

Receipt holds information about a sent swap contract.

type Recoverer added in v0.5.0

type Recoverer interface {
	// GetRecoveryCfg returns information that will help the wallet get back to
	// its previous state after it is recreated.
	GetRecoveryCfg() (map[string]string, error)
	// Move will move all wallet files to a backup directory so the wallet can
	// be recreated.
	Move(backupdir string) error

Recoverer is a wallet implementation with recover functionality.

type RecoveryCoin added in v0.5.0

type RecoveryCoin interface {
	// RecoveryID is an ID that can be used to re-establish funding state during
	// startup. If a Coin implements RecoveryCoin, the RecoveryID will be used
	// in the database record, and ultimately passed to the FundingCoins method.
	RecoveryID() dex.Bytes

type RedeemEstimate added in v0.2.0

type RedeemEstimate struct {
	// RealisticBestCase is the best-case scenario fees of a single transaction
	// with a match covering the entire order, at the prevailing fee rate.
	RealisticBestCase uint64 `json:"realisticBestCase"`
	// RealisticWorstCase is the worst-case scenario fees of all 1-lot matches,
	// each with their own call to Redeem.
	RealisticWorstCase uint64 `json:"realisticWorstCase"`

RedeemEstimate is an estimate of the range of fees that might realistically be assessed to the redemption transaction.

type RedeemForm added in v0.2.0

type RedeemForm struct {
	Redemptions []*Redemption
	// FeeSuggestion is a suggested fee rate. For redemptions, the suggestion is
	// just a fallback if an internal estimate using the wallet's redeem confirm
	// block target setting is not available. Since this is the redemption,
	// there is no obligation on the client to use the fee suggestion in any
	// way, but obviously fees that are too low may result in the redemption
	// getting stuck in mempool.
	FeeSuggestion uint64
	Options       map[string]string

RedeemForm is a group of Redemptions. The struct will be expanded in in-progress work to accommodate order-time options.

type Redemption

type Redemption struct {
	// Spends is the AuditInfo for the swap output being spent.
	Spends *AuditInfo
	// Secret is the secret key needed to satisfy the swap contract.
	Secret dex.Bytes

Redemption is a redemption transaction that spends a counter-party's swap contract.

type RegisteredAsset

type RegisteredAsset struct {
	ID     uint32
	Symbol string
	Info   *WalletInfo
	Tokens map[uint32]*Token

A registered asset is information about a supported asset.

type Rescanner added in v0.4.1

type Rescanner interface {
	Rescan(ctx context.Context) error

Rescanner is a wallet implementation with rescan functionality.

type SwapEstimate added in v0.2.0

type SwapEstimate struct {
	// Lots is the number of lots in the order.
	Lots uint64 `json:"lots"`
	// Value is the total value of the order.
	Value uint64 `json:"value"`
	// MaxFees is the maximum possible fees that can be assessed for the order's
	// swaps.
	MaxFees uint64 `json:"maxFees"`
	// RealisticWorstCase is an estimation of the fees that might be assessed in
	// a worst-case scenario of 1 tx per 1 lot match, but at the prevailing fee
	// rate estimate.
	RealisticWorstCase uint64 `json:"realisticWorstCase"`
	// RealisticBestCase is an estimation of the fees that might be assessed in
	// a best-case scenario of 1 tx and 1 output for the entire order.
	RealisticBestCase uint64 `json:"realisticBestCase"`

SwapEstimate is an estimate of the fees and locked amounts associated with an order.

type Swaps

type Swaps struct {
	// Inputs are the Coins being spent.
	Inputs Coins
	// Contract is the contract data.
	Contracts []*Contract
	// FeeRate is the required fee rate in atoms/byte.
	FeeRate uint64
	// LockChange can be set to true if the change should be locked for
	// subsequent matches.
	LockChange bool
	// AssetConfig contains the asset version and fee configuration for the DEX.
	// NOTE: Only one Config field is supported, so only orders from the same
	// host can be batched. We could consider moving this field to the Contract
	// and Wallets could batch compatible swaps internally.
	AssetConfig *dex.Asset
	// Options are OrderOptions set or selected by the user at order time.
	Options map[string]string

Swaps is the details needed to broadcast a swap contract(s).

type Sweeper added in v0.4.1

type Sweeper interface {
	Sweep(address string, feeRate uint64) (Coin, error)

Sweeper is a wallet that can clear the entire balance of the wallet/account to an address. Similar to Withdraw, but no input value is required.

type Token added in v0.5.0

type Token struct {
	Definition *WalletDefinition `json:"definition"`

Token combines the generic dex.Token with a WalletDefinition.

func TokenInfo added in v0.5.0

func TokenInfo(assetID uint32) *Token

Token returns *Token for a registered token, or nil if the token is unknown.

type TokenMaster added in v0.5.0

type TokenMaster interface {
	// CreateTokenWallet creates a wallet for the specified token asset. The
	// settings correspond to the Token.Definition.ConfigOpts.
	CreateTokenWallet(assetID uint32, settings map[string]string) error
	// OpenTokenWallet opens a wallet for the specified token asset. The
	// settings correspond to the Token.Definition.ConfigOpts. The tipChange
	// function will be called after the parent's tipChange function.
	OpenTokenWallet(assetID uint32, settings map[string]string, tipChange func(error)) (Wallet, error)

TokenMaster is implemented by assets which support degenerate tokens.

type Wallet

type Wallet interface {
	// It should be assumed that once disconnected, subsequent Connect calls
	// will fail, requiring a new Wallet instance.
	// Info returns a set of basic information about the wallet driver.
	Info() *WalletInfo
	// Balance should return the balance of the wallet, categorized by
	// available, immature, and locked. Balance takes a list of minimum
	// confirmations for which to calculate maturity, and returns a list of
	// corresponding *Balance.
	Balance() (*Balance, error)
	// FundOrder selects coins for use in an order. The coins will be locked,
	// and will not be returned in subsequent calls to FundOrder or calculated
	// in calls to Available, unless they are unlocked with ReturnCoins. The
	// returned []dex.Bytes contains the redeem scripts for the selected coins.
	// Equal number of coins and redeemed scripts must be returned. A nil or
	// empty dex.Bytes should be appended to the redeem scripts collection for
	// coins with no redeem script.
	FundOrder(*Order) (coins Coins, redeemScripts []dex.Bytes, err error)
	// MaxOrder generates information about the maximum order size and
	// associated fees that the wallet can support for the specified DEX. The
	// fees are an estimate based on current network conditions, and will be <=
	// the fees associated with the Asset.MaxFeeRate. For quote assets, lotSize
	// will be an estimate based on current market conditions. lotSize should
	// not be zero.
	MaxOrder(*MaxOrderForm) (*SwapEstimate, error)
	// PreSwap gets a pre-swap estimate for the specified order size.
	PreSwap(*PreSwapForm) (*PreSwap, error)
	// PreRedeem gets a pre-redeem estimate for the specified order size.
	PreRedeem(*PreRedeemForm) (*PreRedeem, error)
	// ReturnCoins unlocks coins. This would be necessary in the case of a
	// canceled order.
	ReturnCoins(Coins) error
	// FundingCoins gets funding coins for the coin IDs. The coins are locked.
	// This method might be called to reinitialize an order from data stored
	// externally. This method will only return funding coins, e.g. unspent
	// transaction outputs.
	FundingCoins([]dex.Bytes) (Coins, error)
	// Swap sends the swaps in a single transaction. The Receipts returned can
	// be used to refund a failed transaction. The Input coins are unlocked
	// where necessary to ensure accurate balance reporting in cases where the
	// wallet includes spent coins as part of the locked balance just because
	// they were previously locked.
	Swap(*Swaps) (receipts []Receipt, changeCoin Coin, feesPaid uint64, err error)
	// Redeem sends the redemption transaction, which may contain more than one
	// redemption. The input coin IDs and the output Coin are returned.
	Redeem(redeems *RedeemForm) (ins []dex.Bytes, out Coin, feesPaid uint64, err error)
	// SignMessage signs the coin ID with the private key associated with the
	// specified Coin. A slice of pubkeys required to spend the Coin and a
	// signature for each pubkey are returned.
	SignMessage(Coin, dex.Bytes) (pubkeys, sigs []dex.Bytes, err error)
	// AuditContract retrieves information about a swap contract from the
	// provided txData and broadcasts the txData to ensure the contract is
	// propagated to the blockchain. The information returned would be used
	// to verify the counter-party's contract during a swap. It is not an
	// error if the provided txData cannot be broadcasted because it may
	// already be broadcasted. A successful audit response does not mean
	// the tx exists on the blockchain, use SwapConfirmations to ensure
	// the tx is mined.
	AuditContract(coinID, contract, txData dex.Bytes, rebroadcast bool) (*AuditInfo, error)
	// LocktimeExpired returns true if the specified contract's locktime has
	// expired, making it possible to issue a Refund. The contract expiry time
	// is also returned, but reaching this time does not necessarily mean the
	// contract can be refunded since assets have different rules to satisfy the
	// lock. For example, in Bitcoin the median of the last 11 blocks must be
	// past the expiry time, not the current time.
	LocktimeExpired(ctx context.Context, contract dex.Bytes) (bool, time.Time, error)
	// FindRedemption watches for the input that spends the specified
	// coin and contract, and returns the spending input and the
	// secret key when it finds a spender.
	// For typical utxo-based blockchains, every input of every block tx
	// (starting at the contract block) will need to be scanned until a spending
	// input is found.
	// FindRedemption is necessary to deal with the case of a maker redeeming
	// but not forwarding their redemption information. The DEX does not monitor
	// for this case. While it will result in the counter-party being penalized,
	// the input still needs to be found so the swap can be completed.
	// NOTE: This could potentially be a long and expensive operation if
	// performed long after the swap is broadcast; might be better executed from
	// a goroutine.
	FindRedemption(ctx context.Context, coinID, contract dex.Bytes) (redemptionCoin, secret dex.Bytes, err error)
	// Refund refunds a contract. This can only be used after the time lock has
	// expired AND if the contract has not been redeemed/refunded. This method
	// MUST return an asset.CoinNotFoundError error if the swap is already
	// spent, which is used to indicate if FindRedemption should be used and the
	// counterparty's swap redeemed. NOTE: The contract cannot be retrieved from
	// the unspent coin info as the wallet does not store it, even though it was
	// known when the init transaction was created. The client should store this
	// information for persistence across sessions.
	Refund(coinID, contract dex.Bytes, feeRate uint64) (dex.Bytes, error)
	// DepositAddress returns an address for depositing funds into the exchange
	// wallet.
	DepositAddress() (string, error)
	// OwnsDepositAddress indicates if the provided address can be used
	// to deposit funds into the wallet.
	OwnsDepositAddress(address string) (bool, error)
	// RedemptionAddress gets an address for use in redeeming the counterparty's
	// swap. This would be included in their swap initialization. This is
	// presently called when each trade order is *submitted*. If these are
	// unique addresses and the orders are canceled, the gap limit may become a
	// hurdle when restoring the wallet.
	RedemptionAddress() (string, error)
	// Unlock unlocks the exchange wallet.
	Unlock(pw []byte) error
	// Lock locks the exchange wallet.
	Lock() error
	// Locked will be true if the wallet is currently locked.
	Locked() bool
	// SwapConfirmations gets the number of confirmations and the spend status
	// for the specified swap. If the swap was not funded by this wallet, and
	// it is already spent, you may see CoinNotFoundError.
	// If the coin is located, but recognized as spent, no error is returned.
	// If the contract is already redeemed or refunded, the confs value may not
	// be accurate.
	// The contract and matchTime are provided so that wallets may search for
	// the coin using light filters.
	SwapConfirmations(ctx context.Context, coinID dex.Bytes, contract dex.Bytes, matchTime time.Time) (confs uint32, spent bool, err error)
	// ValidateSecret checks that the secret hashes to the secret hash.
	ValidateSecret(secret, secretHash []byte) bool
	// SyncStatus is information about the blockchain sync status. It should
	// only indicate synced when there are network peers and all blocks on the
	// network have been processed by the wallet.
	SyncStatus() (synced bool, progress float32, err error)
	// RegFeeConfirmations gets the confirmations for a registration fee
	// payment. This method need not be supported by all assets. Those assets
	// which do no support DEX registration fees will return an ErrUnsupported.
	RegFeeConfirmations(ctx context.Context, coinID dex.Bytes) (confs uint32, err error)
	// Send sends the exact value to the specified address. This is different
	// from Withdraw, which subtracts the tx fees from the amount sent.
	Send(address string, value, feeRate uint64) (Coin, error)
	// EstimateRegistrationTxFee returns an estimate for the tx fee needed to
	// pay the registration fee using the provided feeRate.
	EstimateRegistrationTxFee(feeRate uint64) uint64

Wallet is a common interface to be implemented by cryptocurrency wallet software.

func OpenWallet added in v0.4.0

func OpenWallet(assetID uint32, cfg *WalletConfig, logger dex.Logger, net dex.Network) (w Wallet, err error)

OpenWallet sets up the asset, returning the exchange wallet.

type WalletConfig

type WalletConfig struct {
	// Type is the type of wallet, corresponding to the Type field of an
	// available WalletDefinition.
	Type string
	// Settings is the key-value store of wallet connection parameters. The
	// Settings are supplied by the user according the the WalletInfo's
	// ConfigOpts.
	Settings map[string]string
	// TipChange is a function that will be called when the blockchain
	// monitoring loop detects a new block. If the error supplied is nil, the
	// client should check the confirmations on any negotiating swaps to see if
	// action is needed. If the error is non-nil, the wallet monitoring loop
	// encountered an error while retrieving tip information. This function
	// should not be blocking, and Wallet implementations should not rely on any
	// specific side effect of the function call.
	TipChange func(error)
	// PeersChange is a function that will be called when the number of
	// wallet/node peers changes, or the wallet fails to get the count. This
	// should not be called prior to Connect of the constructed wallet.
	PeersChange func(uint32, error)
	// DataDir is a filesystem directory the the wallet may use for persistent
	// storage.
	DataDir string

WalletConfig is the configuration settings for the wallet. WalletConfig is passed to the wallet constructor.

type WalletDefinition added in v0.4.0

type WalletDefinition struct {
	// If seeded is true, the Create method will be called with a deterministic
	// seed that should be used to set the wallet key(s). This would be
	// true for built-in wallets.
	Seeded bool `json:"seeded"`
	// Type is a string identifying the wallet type. NOTE: There should be a
	// particular WalletTrait set for any given Type, but wallet construction is
	// presently required to discern traits.
	Type string `json:"type"`
	// Tab is a displayable string for the wallet type. One or two words. First
	// word capitalized. Displayed on a wallet selection tab.
	Tab string `json:"tab"`
	// Description is a short description of the wallet, suitable for a tooltip.
	Description string `json:"description"`
	// DefaultConfigPath is the default file path that the Wallet uses for its
	// configuration file. Probably only useful for unseeded / external wallets.
	DefaultConfigPath string `json:"configpath"`
	// ConfigOpts is a slice of expected Wallet config options, with the display
	// name, config key (for parsing the option from a config file/text) and
	// description for each option. This can be used to request config info from
	// users e.g. via dynamically generated GUI forms.
	ConfigOpts []*ConfigOption `json:"configopts"`
	// NoAuth can be set true to hide the wallet password field during wallet
	// creation.
	// TODO: Use an asset.Authenticator interface and WalletTraits to do this
	// instead.
	NoAuth bool `json:"noauth"`

type WalletInfo

type WalletInfo struct {
	// Name is the display name for the currency, e.g. "Decred"
	Name string `json:"name"`
	// Version is the Wallet's version number, which is used to signal when
	// major changes are made to internal details such as coin ID encoding and
	// contract structure that must be common to a server's.
	Version uint32 `json:"version"`
	// AvailableWallets is an ordered list of available WalletDefinition. The
	// first WalletDefinition is considered the default, and might, for instance
	// be the initial form offered to the user for configuration, with others
	// available to select.
	AvailableWallets []*WalletDefinition `json:"availablewallets"`
	// LegacyWalletIndex should be set for assets that existed before wallets
	// were typed. The index should point to the WalletDefinition that should
	// be assumed when the type is provided as an empty string.
	LegacyWalletIndex int `json:"emptyidx"`
	// UnitInfo is the information about unit names and conversion factors for
	// the asset.
	UnitInfo dex.UnitInfo `json:"unitinfo"`

WalletInfo is auxiliary information about an ExchangeWallet.

func Info

func Info(assetID uint32) (*WalletInfo, error)

Info returns the WalletInfo for the specified asset, if supported. Info only returns WalletInfo for base chain assets, not tokens.

type WalletRestoration added in v0.5.0

type WalletRestoration struct {
	Target string `json:"target"`
	Seed   string `json:"seed"`
	// SeedName is the name of the seed used for this particular wallet, i.e
	// Private Key.
	SeedName     string `json:"seedName"`
	Instructions string `json:"instructions"`

WalletRestoration contains all the information needed for a user to restore their wallet in an external wallet.

type WalletRestorer added in v0.5.0

type WalletRestorer interface {
	// RestorationInfo returns information about how to restore the wallet in
	// various external wallets.
	RestorationInfo(seed []byte) ([]*WalletRestoration, error)

WalletRestorer is a wallet which gives information about how to restore itself in external wallet software.

type WalletTrait added in v0.4.1

type WalletTrait uint64

WalletTrait is a bitset indicating various optional wallet features, such as the presence of auxiliary methods like Rescan, Withdraw and Sweep.

const (
	WalletTraitRescanner    WalletTrait = 1 << iota // The Wallet is an asset.Rescanner.
	WalletTraitNewAddresser                         // The Wallet can generate new addresses on demand with NewAddress.
	WalletTraitLogFiler                             // The Wallet allows for downloading of a log file.
	WalletTraitFeeRater                             // Wallet can provide a fee rate for non-critical transactions
	WalletTraitAccelerator                          // This wallet can accelerate transactions using the CPFP technique
	WalletTraitRecoverer                            // The wallet is an asset.Recoverer.
	WalletTraitWithdrawer                           // The Wallet can withdraw a specific amount from an exchange wallet.
	WalletTraitSweeper                              // The Wallet can sweep all the funds, leaving no change.
	WalletTraitRestorer                             // The wallet is an asset.WalletRestorer

func DetermineWalletTraits added in v0.4.1

func DetermineWalletTraits(w Wallet) (t WalletTrait)

DetermineWalletTraits returns the WalletTrait bitset for the provided Wallet.

func (WalletTrait) IsAccelerator added in v0.5.0

func (wt WalletTrait) IsAccelerator() bool

IsAccelerator tests if the WalletTrait has the WalletTraitAccelerator bit set, which indicates the presence of an Accelerate method.

func (WalletTrait) IsFeeRater added in v0.4.3

func (wt WalletTrait) IsFeeRater() bool

IsFeeRater tests if the WalletTrait has the WalletTraitFeeRater bit set, which indicates the presence of a FeeRate method.

func (WalletTrait) IsLogFiler added in v0.4.1

func (wt WalletTrait) IsLogFiler() bool

IsLogFiler tests if WalletTrait has the WalletTraitLogFiler bit set.

func (WalletTrait) IsNewAddresser added in v0.4.1

func (wt WalletTrait) IsNewAddresser() bool

IsNewAddresser tests if the WalletTrait has the WalletTraitNewAddresser bit set, which indicates the presence of a NewAddress method that will generate a new address on each call. If this method does not exist, the Address method should be assumed to always return the same deposit address.

func (WalletTrait) IsRecoverer added in v0.5.0

func (wt WalletTrait) IsRecoverer() bool

IsRecoverer tests if the WalletTrait has the WalletTraitRecoverer bit set, which indicates the wallet implements the Recoverer interface.

func (WalletTrait) IsRescanner added in v0.4.1

func (wt WalletTrait) IsRescanner() bool

IsRescanner tests if the WalletTrait has the WalletTraitRescanner bit set.

func (WalletTrait) IsRestorer added in v0.5.0

func (wt WalletTrait) IsRestorer() bool

IsRestorer test if the WalletTrait has the WalletTraitRestorer bit set, which indicates the wallet implements the WalletRestorer interface.

func (WalletTrait) IsSweeper added in v0.5.0

func (wt WalletTrait) IsSweeper() bool

IsSweeper test if the WalletTrait has the WalletTraitSweeper bit set, which indicates the presence of a Sweep method.

func (WalletTrait) IsWithdrawer added in v0.5.0

func (wt WalletTrait) IsWithdrawer() bool

IsWithdrawer tests if the WalletTrait has the WalletTraitSender bit set, which indicates the presence of a Withdraw method.

type Withdrawer added in v0.5.0

type Withdrawer interface {
	// Withdraw withdraws funds to the specified address. Fees are subtracted
	// from the value.
	Withdraw(address string, value, feeRate uint64) (Coin, error)

Withdrawer is a wallet that can withdraw a certain amount from the source wallet/account.

type XYRange added in v0.5.0

type XYRange struct {
	Start XYRangePoint `json:"start"`
	End   XYRangePoint `json:"end"`
	XUnit string       `json:"xUnit"`
	YUnit string       `json:"yUnit"`

XYRange is an option in which the user's setting of one value is reflected in the other and possible values are restricted. The assumed relationship is linear, e.g. y = mx + b. The value submitted to FundOrder/Swap/Redeem should specify the x value.

type XYRangePoint added in v0.5.0

type XYRangePoint struct {
	Label string  `json:"label"`
	X     float64 `json:"x"`
	Y     float64 `json:"y"`

XYRangePoint is a point specifying the start or end of an XYRange.


Path Synopsis
Package electrum provides a client for an ElectrumX server.
Package electrum provides a client for an ElectrumX server.

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