dlc

package
v0.0.0-...-1c741c1 Latest Latest
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 Go to latest Published: Aug 23, 2019 License: MIT Imports: 21 Imported by: 0

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Index

Constants

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Variables

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Functions

This section is empty.

Types

type Addresses 

type Addresses map[Contractor]string

Addresses is addresses in string

type Builder 

type Builder struct {
	Contract *DLC
	// contains filtered or unexported fields
}

Builder builds DLC by interacting with wallet

func NewBuilder 

func NewBuilder(
	p Contractor, w wallet.Wallet, d *DLC) *Builder

NewBuilder createa a builder from DLC

func (*Builder) AcceptAdderss 

func (b *Builder) AcceptAdderss(addr btcutil.Address) error

AcceptAdderss accepts address from the counterparty

func (*Builder) AcceptCETxSignatures 

func (b *Builder) AcceptCETxSignatures(sigs [][]byte) error

AcceptCETxSignatures accepts CETx signatures received from the counterparty

func (*Builder) AcceptChangeAdderss 

func (b *Builder) AcceptChangeAdderss(addr btcutil.Address) error

AcceptChangeAdderss accepts change address from the counterparty

func (*Builder) AcceptFundWitnesses 

func (b *Builder) AcceptFundWitnesses(wits []wire.TxWitness)

AcceptFundWitnesses accepts witnesses for fund txins owned by the counerparty

func (*Builder) AcceptPubkey 

func (b *Builder) AcceptPubkey(pub []byte) error

AcceptPubkey accepts counter party's public key

func (*Builder) AcceptRefundTxSignature 

func (b *Builder) AcceptRefundTxSignature(sig []byte) error

AcceptRefundTxSignature verifies couterparty's given signature is valid and then

func (*Builder) AcceptUtxos 

func (b *Builder) AcceptUtxos(utxos []Utxo) error

AcceptUtxos accepts utxos

func (*Builder) Address 

func (b *Builder) Address() btcutil.Address

Address returns address to distribute fund

func (*Builder) ChangeAddress 

func (b *Builder) ChangeAddress() btcutil.Address

ChangeAddress returns address to send change

func (*Builder) ExecuteContract 

func (b *Builder) ExecuteContract() error

ExecuteContract sends CETx and closing tx

func (*Builder) FixDeal 

func (b *Builder) FixDeal(fm *oracle.SignedMsg, idxs []int) error

FixDeal fixes a deal by a oracle's signature set by picking up required messages and sigs

func (*Builder) FixedDealAmt 

func (b *Builder) FixedDealAmt() (btcutil.Amount, error)

FixedDealAmt returns fixed amt that the party will receive

func (*Builder) FundAmt 

func (b *Builder) FundAmt() btcutil.Amount

FundAmt returns fund amount

func (*Builder) PrepareFundTx 

func (b *Builder) PrepareFundTx() error

PrepareFundTx prepares fundtx ins and out

func (*Builder) PreparePubkey 

func (b *Builder) PreparePubkey() error

PreparePubkey sets fund pubkey

func (*Builder) PublicKey 

func (b *Builder) PublicKey() ([]byte, error)

PublicKey returns serialized public key (compressed)

func (*Builder) SendFundTx 

func (b *Builder) SendFundTx() error

SendFundTx sends fund tx to the network

func (*Builder) SendRefundTx 

func (b *Builder) SendRefundTx() error

SendRefundTx sends refund tx

func (*Builder) SetOraclePubkeySet 

func (b *Builder) SetOraclePubkeySet(
	pubset *oracle.PubkeySet, idxs []int) error

SetOraclePubkeySet sets oracle's pubkey set

func (*Builder) SignContractExecutionTx 

func (b *Builder) SignContractExecutionTx(deal *Deal, idx int) ([]byte, error)

SignContractExecutionTx signs a contract execution tx for a given party

func (*Builder) SignContractExecutionTxs 

func (b *Builder) SignContractExecutionTxs() ([][]byte, error)

SignContractExecutionTxs signs contract execution txs for all deals

func (*Builder) SignFundTx 

func (b *Builder) SignFundTx() ([]wire.TxWitness, error)

SignFundTx signs fund tx and return witnesses for the txins owned by the party

func (*Builder) SignRefundTx 

func (b *Builder) SignRefundTx() ([]byte, error)

SignRefundTx creates signature for a refund tx, sets it, and returns it

func (*Builder) SignedClosingTx 

func (b *Builder) SignedClosingTx(cetx *wire.MsgTx) (*wire.MsgTx, error)

SignedClosingTx constructs a closing tx with witness

func (*Builder) SignedContractExecutionTx 

func (b *Builder) SignedContractExecutionTx() (*wire.MsgTx, error)

SignedContractExecutionTx returns a contract execution tx signed by both parties TODO: separate SignedContractExecutionTx and SignContractExecutionTx

func (*Builder) Utxos 

func (b *Builder) Utxos() []Utxo

Utxos returns utxos

type ChangeAddressNotExistsError 

type ChangeAddressNotExistsError struct {
	// contains filtered or unexported fields
}

ChangeAddressNotExistsError is raised when change address doesn't exist

type Conditions 

type Conditions struct {
	NetParams      *chaincfg.Params              `validate:"required"`
	FixingTime     time.Time                     `validate:"required,gt=time.Now()"`
	FundAmts       map[Contractor]btcutil.Amount `validate:"required,funds,dive,gte=0"`
	FundFeerate    btcutil.Amount                `validate:"required,gt=0"` // fund fee rate (satoshi per byte)
	RedeemFeerate  btcutil.Amount                `validate:"required,gt=0"` // redeem fee rate (satoshi per byte)
	RefundLockTime uint32                        `validate:"required,gt=0"` // refund locktime (block height)
	Deals          []*Deal                       `validate:"required,gt=0,dive,required"`
	PremiumInfo    *PremiumInfo
}

Conditions contains conditions of a contract

func NewConditions 

func NewConditions(
	net *chaincfg.Params,
	ftime time.Time,
	famt1, famt2 btcutil.Amount,
	ffeerate, rfeerate btcutil.Amount,
	refundLockTime uint32,
	deals []*Deal,
	info *PremiumInfo,
) (*Conditions, error)

NewConditions creates a new DLC conditions

func (*Conditions) MarshalJSON 

func (conds *Conditions) MarshalJSON() ([]byte, error)

MarshalJSON implements json.Marshaler

func (*Conditions) UnmarshalJSON 

func (conds *Conditions) UnmarshalJSON(data []byte) error

UnmarshalJSON implements json.Unmarshaler

type ConditionsJSON 

type ConditionsJSON struct {
	Net            string             `json:"network"`
	FixingTime     int64              `json:"fixing_time"`
	FundAmts       map[Contractor]int `json:"fund_amts"`
	FundFeerate    int                `json:"fund_feerate"`
	RedeemFeerate  int                `json:"redeem_feerate"`
	RefundLockTime uint32             `json:"refund_locktime"`
	Deals          []*DealJSON        `json:"deals"`
	PremiumInfo    *PremiumInfoJSON   `json:"premium_info"`
}

ConditionsJSON is contract conditions in JSON format

type Contractor 

type Contractor int

Contractor represents a contractor type 

const (
	// FirstParty is a contractor who creates offer
	FirstParty Contractor = 0
	// SecondParty is a contractor who accepts offer
	SecondParty Contractor = 1
)

func (Contractor) String 

func (p Contractor) String() string

String represents contractor in string format

type DLC 

type DLC struct {
	Conds       *Conditions
	Oracle      *Oracle
	Pubs        map[Contractor]*btcec.PublicKey // pubkeys used for script and txout
	Addrs       map[Contractor]btcutil.Address  // addresses used to distribute funds after fixing deal
	ChangeAddrs map[Contractor]btcutil.Address  // addresses used to send change
	Utxos       map[Contractor][]*Utxo
	FundWits    map[Contractor][]wire.TxWitness // TODO: change to fund signatures
	RefundSigs  map[Contractor][]byte           // signatures for refund tx
	ExecSigs    [][]byte                        // counterparty's signatures for CETxs
}

DLC contains all information required for DLC contract including FundTx, SettlementTx, RefundTx

func NewDLC 

func NewDLC(conds *Conditions) *DLC

NewDLC initializes DLC

func (*DLC) AcceptCETxSignature 

func (d *DLC) AcceptCETxSignature(party Contractor, idx int, sig []byte) error

AcceptCETxSignature sets a signature if it's valid for an identified CETx

func (*DLC) Addresses 

func (d *DLC) Addresses() Addresses

Addresses converts btcutil.Address to string

func (*DLC) ChangeAddresses 

func (d *DLC) ChangeAddresses() Addresses

ChangeAddresses converts btcutil.Address to string

func (*DLC) ClosingTx 

func (d *DLC) ClosingTx(
	p Contractor, cetx *wire.MsgTx) (*wire.MsgTx, error)

ClosingTx constructs a tx that redeems a given CET

func (*DLC) ContractAbandonmentTx 

func (d *DLC) ContractAbandonmentTx(p Contractor) (*wire.MsgTx, error)

ContractAbandonmentTx creates tx that sends all fund to the counterparty Note: This transaction isn't useful in the realworld, but is necessary for PoC

func (*DLC) ContractExecutionTx 

func (d *DLC) ContractExecutionTx(
	party Contractor, deal *Deal, dID int) (*wire.MsgTx, error)

ContractExecutionTx constructs a contract execution tx (CET) using pubkeys and given condition. Both parties have different transactions signed by the other side.

txins: 

[0]:fund transaction output[0]

txouts: 

[0]:settlement script
[1]:p2wpkh (option)

func (*DLC) ContractID 

func (d *DLC) ContractID() (string, error)

ContractID returns contract ID Use fund txid at this moment

func (*DLC) Deal 

func (d *DLC) Deal(idx int) (*Deal, error)

Deal gets a deal by id

func (*DLC) DealByMsgs 

func (d *DLC) DealByMsgs(msgs [][]byte) (idx int, deal *Deal, err error)

DealByMsgs finds a deal by messages

func (*DLC) DepositAmt 

func (d *DLC) DepositAmt(p Contractor) btcutil.Amount

DepositAmt calculates fund amount + fees

func (*DLC) FixDeal 

func (d *DLC) FixDeal(msgs [][]byte, sigs [][]byte) error

FixDeal fixes a deal by setting the signature provided by oracle

func (*DLC) FixedContractExecutionTx 

func (d *DLC) FixedContractExecutionTx(p Contractor) (*wire.MsgTx, error)

FixedContractExecutionTx returns fixed CETx

func (*DLC) FixedDeal 

func (d *DLC) FixedDeal() (idx int, deal *Deal, err error)

FixedDeal returns a fixed deal

func (*DLC) FundTx 

func (d *DLC) FundTx() (*wire.MsgTx, error)

FundTx constructs fund tx using prepared fund tx requirements

func (*DLC) HasDealFixed 

func (d *DLC) HasDealFixed() bool

HasDealFixed checks if a deal has been fixed

func (*DLC) ParseAddresses 

func (d *DLC) ParseAddresses(addrs Addresses) error

ParseAddresses parses address string

func (*DLC) ParseChangeAddresses 

func (d *DLC) ParseChangeAddresses(addrs Addresses) error

ParseChangeAddresses parses address string

func (*DLC) ParsePublicKeys 

func (d *DLC) ParsePublicKeys(pubs PublicKeys) error

ParsePublicKeys parses public key hex strings

func (*DLC) PrepareOracleCommitments 

func (d *DLC) PrepareOracleCommitments(
	V *btcec.PublicKey, Rs []*btcec.PublicKey) error

PrepareOracleCommitments prepares oracle's commitments for all deals

func (*DLC) PublicKeys 

func (d *DLC) PublicKeys() PublicKeys

PublicKeys converts btcec.PublicKey to hex string

func (*DLC) RefundTx 

func (d *DLC) RefundTx() (*wire.MsgTx, error)

RefundTx creates refund tx refund transaction input: 

[0]:fund transaction output[0]
    Sequence (0xfeffffff LE)

output: 

[0]:p2wpkh a
[1]:p2wpkh b

locktime: 

Value decided by contract.

func (*DLC) SignedFundTx 

func (d *DLC) SignedFundTx() (*wire.MsgTx, error)

SignedFundTx constructs signed fundtx

func (*DLC) SignedRefundTx 

func (d *DLC) SignedRefundTx() (*wire.MsgTx, error)

SignedRefundTx returns a refund tx with its witness signature

func (*DLC) VerifyRefundTx 

func (d *DLC) VerifyRefundTx(sig []byte, pub *btcec.PublicKey) error

VerifyRefundTx verifies the refund transaction signature. Returns nil if the passed signature is valid and corresponds to the passed in public key, and an error if it isnt.

type Deal 

type Deal struct {
	Amts map[Contractor]btcutil.Amount `validate:"required,dive,gte=0"`
	Msgs [][]byte                      `validate:"required,gt=0"`
}

Deal contains information about the distributed amounts, commitment messages, and signatures of fixed messages

func NewDeal 

func NewDeal(amt1, amt2 btcutil.Amount, msgs [][]byte) *Deal

NewDeal creates a new deal

type DealJSON 

type DealJSON struct {
	Amts map[Contractor]int `json:"amts"`
	Msgs [][]byte           `json:"msgs"`
}

DealJSON is DLC deals in JSON format

type InvalidNetworkNameError 

type InvalidNetworkNameError struct {
	// contains filtered or unexported fields
}

InvalidNetworkNameError is used when invalid network name is given

type NoFixedDealError 

type NoFixedDealError struct {
	// contains filtered or unexported fields
}

NoFixedDealError is an error for a case when no deals has been fixed yet

type NotEnoughFeesError 

type NotEnoughFeesError struct {
	// contains filtered or unexported fields
}

NotEnoughFeesError is an error that txins aren't enough for txouts

type Oracle 

type Oracle struct {
	PubkeySet   *oracle.PubkeySet  // Oracle's pubkey set
	Commitments []*btcec.PublicKey // Commitments for deals
	Sig         []byte             // Signature for a fixed deal
	SignedMsgs  [][]byte           // Messages signed by Oracle
}

Oracle contains pubkeys and commitments and signature received from oracle

func NewOracle 

func NewOracle(n int) *Oracle

NewOracle initializes oracle

func (*Oracle) MarshalJSON 

func (o *Oracle) MarshalJSON() ([]byte, error)

MarshalJSON implements json.Marshaler

func (*Oracle) UnmarshalJSON 

func (o *Oracle) UnmarshalJSON(data []byte) error

UnmarshalJSON implements json.Unmarshaler

type OracleJSON 

type OracleJSON struct {
	PubkeySet   *oracle.PubkeySetJSON `json:"pubkey"`
	Commitments []string              `json:"commitments"`
	Sig         []byte                `json:"sig"`
	SignedMsgs  [][]byte              `json:"signed_msgs"`
}

OracleJSON is oracle information in JSON format

type PremiumInfo 

type PremiumInfo struct {
	PremiumDestAddress btcutil.Address `validate:"required"`
	PremiumAmount      btcutil.Amount  `validate:"required,gt=0"`
	PayingParty        Contractor      `validate:"oneof= 0 1"`
}

func NewPremiumInfo 

func NewPremiumInfo(premiumAddress btcutil.Address, premiumAmount btcutil.Amount, payingParty Contractor) (*PremiumInfo, error)

type PremiumInfoJSON 

type PremiumInfoJSON struct {
	PremiumDestAddress string `json:"premium_dest_address"`
	PremiumAmount      int    `json:"premium_amount"`
	PayingParty        int    `json:"paying_party"`
}

PremiumInfoJSON is PremiumInfo in JSON format

type PubkeyNotExistsError 

type PubkeyNotExistsError struct {
	// contains filtered or unexported fields
}

PubkeyNotExistsError is error when either public key doesn't exist

type PublicKeys 

type PublicKeys map[Contractor]string

PublicKeys is public keys in hex string format

type Utxo 

type Utxo = btcjson.ListUnspentResult

Utxo is alias of btcjson.ListUnspentResult

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