coins

package
v0.4.2 Latest Latest
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 Go to latest Published: Aug 28, 2023 License: LGPL-3.0 Imports: 8 Imported by: 0

Documentation

Overview

Package coins provides types, conversions and exchange calculations for dealing with cryptocurrency coin and ERC20 token representations.

Index

Constants

View Source 
const (
	// NumEtherDecimals is the number of decimal points needed to represent whole units of Wei in Ether
	NumEtherDecimals = 18
	// NumMoneroDecimals is the number of decimal points needed to represent whole units of piconero in XMR
	NumMoneroDecimals = 12
	// MaxExchangeRateDecimals is the number of decimal points we allow in an exchange rate
	MaxExchangeRateDecimals = 6

	// MaxCoinPrecision is a somewhat arbitrary precision upper bound (2^256 consumes 78 digits)
	MaxCoinPrecision = 100
)

Variables

View Source 
var (
	RelayerFeeWei = big.NewInt(1e16)
	RelayerFeeETH = NewWeiAmount(RelayerFeeWei).AsEther()
)

RelayerFeeWei and RelayerFeeETH are the fixed 0.01 ETH fee for using a swap relayer to claim.

View Source 
var (

	// ErrInvalidCoin is generated when a ProvidesCoin type has an invalid string
	ErrInvalidCoin = errors.New("invalid ProvidesCoin")
)

Functions

func DecimalCtx 

func DecimalCtx() *apd.Context

DecimalCtx clones and returns the apd.Context we use for coin math operations.

func ExceedsDecimals added in v0.3.0 

func ExceedsDecimals(val *apd.Decimal, maxDecimals uint8) bool

ExceedsDecimals returns `true` if the the number, written without an exponent, would require more digits after the decimal place than the passed value `decimals`. Otherwise, `false` is returned.

func FmtPiconeroAsXMR 

func FmtPiconeroAsXMR(piconeros uint64) string

FmtPiconeroAsXMR takes piconeros as input and produces a formatted string of the amount in XMR.

func FmtWeiAsETH 

func FmtWeiAsETH(wei *big.Int) string

FmtWeiAsETH takes Wei as input and produces a formatted string of the amount in ETH.

func NumDecimals added in v0.3.0 

func NumDecimals(value *apd.Decimal) int32

NumDecimals returns the minimum number digits needed to represent the passed value after the decimal point.

func StrToDecimal 

func StrToDecimal(amount string) *apd.Decimal

StrToDecimal converts strings to apd.Decimal for tests, panicking on error. This function is intended for use with string constants, so panic is arguably correct and allows variables to be declared outside a test function.

func ValidatePositive 

func ValidatePositive(jsonFieldName string, maxDecimals uint8, value *apd.Decimal) error

ValidatePositive is for doing additional input validation on apd.Decimal values that should only contain positive values (like min, max and provided amounts).

Types

type ERC20TokenAmount 

type ERC20TokenAmount struct {
	Amount    *apd.Decimal    `json:"amount" validate:"required"` // in standard units
	TokenInfo *ERC20TokenInfo `json:"tokenInfo" validate:"required"`
}

ERC20TokenAmount represents some amount of an ERC20 token in the smallest denomination

func NewERC20TokenAmountFromBigInt 

func NewERC20TokenAmountFromBigInt(amount *big.Int, token *ERC20TokenInfo) *ERC20TokenAmount

NewERC20TokenAmountFromBigInt converts some amount in the smallest token denomination into an ERC20TokenAmount.

func NewTokenAmountFromDecimals added in v0.3.0 

func NewTokenAmountFromDecimals(amount *apd.Decimal, token *ERC20TokenInfo) *ERC20TokenAmount

NewTokenAmountFromDecimals converts an amount in standard units from apd.Decimal into the ERC20TokenAmount type. During the conversion, rounding may occur if the input value is too precise for the token's decimals.

func (*ERC20TokenAmount) AsStd added in v0.3.0 

func (a *ERC20TokenAmount) AsStd() *apd.Decimal

AsStd returns the amount in standard units

func (*ERC20TokenAmount) AsStdString added in v0.3.0 

func (a *ERC20TokenAmount) AsStdString() string

AsStdString returns the ERC20TokenAmount as a base10 string in standard units.

func (*ERC20TokenAmount) BigInt 

func (a *ERC20TokenAmount) BigInt() *big.Int

BigInt returns the ERC20TokenAmount as a *big.Int

func (*ERC20TokenAmount) IsToken 

func (a *ERC20TokenAmount) IsToken() bool

IsToken returns true, because ERC20TokenAmount represents and ERC20 token

func (*ERC20TokenAmount) NumStdDecimals added in v0.3.0 

func (a *ERC20TokenAmount) NumStdDecimals() uint8

NumStdDecimals returns the max decimal precision of the token's standard representation

func (*ERC20TokenAmount) StdSymbol added in v0.3.0 

func (a *ERC20TokenAmount) StdSymbol() string

StdSymbol returns the token's symbol in a format that is safe to log and display

func (*ERC20TokenAmount) String 

func (a *ERC20TokenAmount) String() string

String returns the ERC20TokenAmount as a base10 string in standard units.

func (*ERC20TokenAmount) TokenAddress 

func (a *ERC20TokenAmount) TokenAddress() ethcommon.Address

TokenAddress returns the ERC20 token's ethereum contract address

type ERC20TokenInfo 

type ERC20TokenInfo struct {
	Address     ethcommon.Address `json:"address" validate:"required"`
	NumDecimals uint8             `json:"decimals"` // digits after the Decimal point needed for smallest denomination
	Name        string            `json:"name"`
	Symbol      string            `json:"symbol"`
}

ERC20TokenInfo stores the token contract address and basic info that most ERC20 tokens support

func NewERC20TokenInfo 

func NewERC20TokenInfo(address ethcommon.Address, decimals uint8, name string, symbol string) *ERC20TokenInfo

NewERC20TokenInfo constructs and returns a new ERC20TokenInfo object

func (*ERC20TokenInfo) SanitizedSymbol 

func (t *ERC20TokenInfo) SanitizedSymbol() string

SanitizedSymbol quotes the symbol ensuring escape sequences, newlines, etc. are escaped.

type EthAssetAmount 

type EthAssetAmount interface {
	BigInt() *big.Int
	AsStd() *apd.Decimal
	AsStdString() string
	StdSymbol() string
	IsToken() bool
	NumStdDecimals() uint8
	TokenAddress() ethcommon.Address
}

EthAssetAmount represents an amount of an Ethereum asset (ie. ether or an ERC20)

func NewEthAssetAmount added in v0.3.0 

func NewEthAssetAmount(amount *apd.Decimal, token *ERC20TokenInfo) EthAssetAmount

NewEthAssetAmount accepts an amount, in standard units, for ETH or a token and returns a type implementing EthAssetAmount. If the token is nil, we assume the asset is ETH.

func StrToETHAsset added in v0.3.0 

func StrToETHAsset(amount string, optionalToken *ERC20TokenInfo) EthAssetAmount

StrToETHAsset converts a string into the EthAssetAmount. Pass nil for the token if the asset is ETH.

type ExchangeRate 

type ExchangeRate apd.Decimal

ExchangeRate defines an exchange rate between ETH and XMR. It is defined as the ratio of ETH:XMR that the node wishes to provide. ie. an ExchangeRate of 0.1 means that the node considers 1 ETH = 10 XMR.

func CalcExchangeRate 

func CalcExchangeRate(xmrPrice *apd.Decimal, ethPrice *apd.Decimal) (*ExchangeRate, error)

CalcExchangeRate computes and returns an exchange rate using ETH and XRM prices. The price can be relative to USD, bitcoin or something else, but both values should be relative to the same alternate currency.

func StrToExchangeRate 

func StrToExchangeRate(rate string) *ExchangeRate

StrToExchangeRate converts strings to ExchangeRate for tests, panicking on error.

func ToExchangeRate 

func ToExchangeRate(rate *apd.Decimal) *ExchangeRate

ToExchangeRate casts an *apd.Decimal to *ExchangeRate

func (*ExchangeRate) Decimal 

func (r *ExchangeRate) Decimal() *apd.Decimal

Decimal casts *ExchangeRate to *apd.Decimal

func (*ExchangeRate) MarshalText 

func (r *ExchangeRate) MarshalText() ([]byte, error)

MarshalText hands off JSON encoding to apd.Decimal

func (*ExchangeRate) String 

func (r *ExchangeRate) String() string

func (*ExchangeRate) ToERC20Amount 

func (r *ExchangeRate) ToERC20Amount(xmrAmount *apd.Decimal, token *ERC20TokenInfo) (*apd.Decimal, error)

ToERC20Amount converts an XMR amount to a token amount in standard units with the given exchange rate. If the result requires more decimal places than the token allows, an error is returned.

func (*ExchangeRate) ToETH 

func (r *ExchangeRate) ToETH(xmrAmount *apd.Decimal) (*apd.Decimal, error)

ToETH converts an XMR amount to an ETH amount with the given exchange rate. If the calculated result would have fractional wei, an error is returned.

func (*ExchangeRate) ToXMR 

func (r *ExchangeRate) ToXMR(ethAssetAmt EthAssetAmount) (*apd.Decimal, error)

ToXMR converts an ETH amount to an XMR amount with the given exchange rate. If the calculated value would have fractional piconeros, an error is returned.

func (*ExchangeRate) UnmarshalText 

func (r *ExchangeRate) UnmarshalText(b []byte) error

UnmarshalText hands off JSON decoding to apd.Decimal

type PiconeroAmount 

type PiconeroAmount apd.Decimal

PiconeroAmount represents some amount of piconero (the smallest denomination of monero)

func MoneroToPiconero 

func MoneroToPiconero(xmrAmt *apd.Decimal) *PiconeroAmount

MoneroToPiconero converts an amount in Monero to Piconero

func NewPiconeroAmount 

func NewPiconeroAmount(amount uint64) *PiconeroAmount

NewPiconeroAmount converts piconeros in uint64 to PicnoneroAmount

func (*PiconeroAmount) AsMonero 

func (a *PiconeroAmount) AsMonero() *apd.Decimal

AsMonero converts the piconero PiconeroAmount into standard units

func (*PiconeroAmount) AsMoneroString 

func (a *PiconeroAmount) AsMoneroString() string

AsMoneroString converts a PiconeroAmount into a formatted XMR amount string.

func (*PiconeroAmount) Cmp 

func (a *PiconeroAmount) Cmp(other *PiconeroAmount) int

Cmp compares a and other and returns: 

-1 if a < other
 0 if a == other
+1 if a > other

func (*PiconeroAmount) CmpU64 

func (a *PiconeroAmount) CmpU64(other uint64) int

CmpU64 compares a and other and returns: 

-1 if a < other
 0 if a == other
+1 if a > other

func (*PiconeroAmount) Decimal 

func (a *PiconeroAmount) Decimal() *apd.Decimal

Decimal casts *PiconeroAmount to *apd.Decimal

func (*PiconeroAmount) MarshalText 

func (a *PiconeroAmount) MarshalText() ([]byte, error)

MarshalText hands off JSON encoding to apd.Decimal

func (*PiconeroAmount) String 

func (a *PiconeroAmount) String() string

String returns the PiconeroAmount as a base10 string

func (*PiconeroAmount) Uint64 

func (a *PiconeroAmount) Uint64() (uint64, error)

Uint64 converts piconero amount to uint64. Errors if a is negative or larger than 2^63-1.

func (*PiconeroAmount) UnmarshalText 

func (a *PiconeroAmount) UnmarshalText(b []byte) error

UnmarshalText hands off JSON decoding to apd.Decimal

type ProvidesCoin 

type ProvidesCoin string

ProvidesCoin represents a coin that a swap participant can provide. 

var (
	ProvidesXMR ProvidesCoin = "XMR" //nolint
	ProvidesETH ProvidesCoin = "ETH" //nolint
)

func NewProvidesCoin 

func NewProvidesCoin(s string) (ProvidesCoin, error)

NewProvidesCoin converts a string to a ProvidesCoin.

func (*ProvidesCoin) MarshalText 

func (c *ProvidesCoin) MarshalText() ([]byte, error)

MarshalText hands off JSON encoding to apd.Decimal

func (*ProvidesCoin) String 

func (c *ProvidesCoin) String() string

func (*ProvidesCoin) UnmarshalText 

func (c *ProvidesCoin) UnmarshalText(data []byte) error

UnmarshalText hands off JSON decoding to apd.Decimal

type WeiAmount 

type WeiAmount apd.Decimal

WeiAmount represents some amount of ETH in the smallest denomination (Wei)

func EtherToWei 

func EtherToWei(ethAmt *apd.Decimal) *WeiAmount

EtherToWei converts some amount of standard ETH to a WeiAmount.

func IntToWei 

func IntToWei(amount int64) *WeiAmount

IntToWei converts some amount of Wei into an WeiAmount for unit tests.

func NewWeiAmount 

func NewWeiAmount(amount *big.Int) *WeiAmount

NewWeiAmount converts the passed *big.Int representation of a Wei amount to the WeiAmount type. The returned value is a copy with no references to the passed value.

func ToWeiAmount 

func ToWeiAmount(wei *apd.Decimal) *WeiAmount

ToWeiAmount casts an *apd.Decimal that is already in Wei to *WeiAmount

func (*WeiAmount) AsEther 

func (a *WeiAmount) AsEther() *apd.Decimal

AsEther returns the Wei amount as ETH

func (*WeiAmount) AsEtherString 

func (a *WeiAmount) AsEtherString() string

AsEtherString converts the Wei amount to an ETH amount string

func (*WeiAmount) AsStd added in v0.3.0 

func (a *WeiAmount) AsStd() *apd.Decimal

AsStd is an alias for AsEther, returning the Wei amount as ETH

func (*WeiAmount) AsStdString added in v0.3.0 

func (a *WeiAmount) AsStdString() string

AsStdString is an alias for AsEtherString, returning the Wei amount as an ETH string

func (*WeiAmount) BigInt 

func (a *WeiAmount) BigInt() *big.Int

BigInt returns the given WeiAmount as a *big.Int

func (*WeiAmount) Cmp 

func (a *WeiAmount) Cmp(b *WeiAmount) int

Cmp compares a and b and returns: 

-1 if a <  b
 0 if a == b
+1 if a >  b

func (*WeiAmount) Decimal 

func (a *WeiAmount) Decimal() *apd.Decimal

Decimal exists to reduce ugly casts

func (*WeiAmount) IsToken 

func (a *WeiAmount) IsToken() bool

IsToken returns false, as WeiAmount is not an ERC20 token

func (*WeiAmount) MarshalText 

func (a *WeiAmount) MarshalText() ([]byte, error)

MarshalText hands off JSON encoding to apd.Decimal

func (*WeiAmount) NumStdDecimals added in v0.3.0 

func (a *WeiAmount) NumStdDecimals() uint8

NumStdDecimals returns 18

func (*WeiAmount) StdSymbol added in v0.3.0 

func (a *WeiAmount) StdSymbol() string

StdSymbol returns the string "ETH"

func (*WeiAmount) String 

func (a *WeiAmount) String() string

String returns the Wei amount as a base10 string

func (*WeiAmount) Sub 

func (a *WeiAmount) Sub(b *WeiAmount) *WeiAmount

Sub returns the value of a-b in a newly allocated WeiAmount variable. If a or b is NaN, this function will panic, but we exclude such values during input validation.

func (*WeiAmount) TokenAddress 

func (a *WeiAmount) TokenAddress() ethcommon.Address

TokenAddress returns the all-zero address as WeiAmount is not an ERC20 token

func (*WeiAmount) UnmarshalText 

func (a *WeiAmount) UnmarshalText(b []byte) error

UnmarshalText hands off JSON decoding to apd.Decimal

Source Files

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