lnwallet: add comments to wallet.go
This commit is contained in:
Olaoluwa Osuntokun
parent
8ca8eb60fb
commit
6eb77b02c2
@ -1,7 +1,7 @@
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package lnwallet
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import (
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"encoding/binary"
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"bytes"
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"errors"
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"fmt"
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"math"
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@ -27,6 +27,8 @@ import (
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)
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const (
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// The size of the buffered queue of request to the wallet from the
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// outside word.
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msgBufferSize = 100
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)
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@ -42,10 +44,16 @@ var (
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lightningNamespaceKey = []byte("ln-wallet")
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waddrmgrNamespaceKey = []byte("waddrmgr")
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wtxmgrNamespaceKey = []byte("wtxmgr")
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endian = binary.BigEndian
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)
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// FundingType represents the type of the funding transaction. The type of
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// funding transaction available depends entirely on the level of upgrades to
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// Script on the current network. Across the network it's possible for asymmetric
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// funding types to exist across hop. However, for direct links, the funding type
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// supported by both parties must be identical. The most 'powerful' funding type
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// is SEGWIT. This funding type also assumes that both CSV+CLTV are available on
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// the network.
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// NOTE: Ultimately, this will most likely be deprecated...
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type FundingType uint16
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const (
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@ -66,100 +74,162 @@ const (
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CLTV_RESERVE
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)
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// initFundingReserveReq...
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// initFundingReserveReq is the first message sent to initiate the workflow
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// required to open a payment channel with a remote peer. The initial required
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// paramters are configurable accross channels. These paramters are to be chosen
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// depending on the fee climate within the network, and time value of funds to
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// be locked up within the channel. Upon success a ChannelReservation will be
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// created in order to track the lifetime of this pending channel. Outputs
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// selected will be 'locked', making them unavailable, for any other pending
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// reservations. Therefore, all channels in reservation limbo will be periodically
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// after a timeout period in order to avoid "exhaustion" attacks.
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// NOTE: The workflow currently assumes fully balanced symmetric channels.
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// Meaning both parties must encumber the same amount of funds.
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// TODO(roasbeef): zombie reservation sweeper goroutine.
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type initFundingReserveMsg struct {
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fundingAmount btcutil.Amount
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// The type of the funding transaction. See above for further details.
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fundingType FundingType
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// The amount of funds requested for this channel.
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fundingAmount btcutil.Amount
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// The minimum accepted satoshis/KB fee for the funding transaction. In
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// order to ensure timely confirmation, it is recomened that this fee
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// should be generous, paying some multiple of the accepted base fee
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// rate of the network.
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// TODO(roasbeef): integrate fee estimation project...
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minFeeRate btcutil.Amount
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// The ID of the remote node we would like to open a channel with.
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nodeID [32]byte
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// TODO(roasbeef): optional reserve for CLTV, etc.
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// The delay on the "pay-to-self" output(s) of the commitment transaction.
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csvDelay uint32
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// Insuffcient funds etc..
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err chan error // Buffered
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// A channel in which all errors will be sent accross. Will be nil if
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// this initial set is succesful.
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// NOTE: In order to avoid deadlocks, this channel MUST be buffered.
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err chan error
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resp chan *ChannelReservation // Buffered
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// A ChannelReservation with our contributions filled in will be sent
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// accross this channel in the case of a succesfully reservation
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// initiation. In the case of an error, this will read a nil pointer.
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// NOTE: In order to avoid deadlocks, this channel MUST be buffered.
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resp chan *ChannelReservation
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}
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// FundingReserveCancelMsg...
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// fundingReserveCancelMsg is a message reserved for cancelling an existing
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// channel reservation identified by its reservation ID. Cancelling a reservation
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// frees its locked outputs up, for inclusion within further reservations.
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type fundingReserveCancelMsg struct {
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pendingFundingID uint64
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// Buffered, used for optionally synchronization.
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// NOTE: In order to avoid deadlocks, this channel MUST be buffered.
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err chan error // Buffered
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}
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// addContributionMsg...
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// addContributionMsg represents a message executing the second phase of the
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// channel reservation workflow. This message carries the counterparty's
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// "contribution" to the payment channel. In the case that this message is
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// processed without generating any errors, then channel reservation will then
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// be able to construct the funding tx, both commitment transactions, and
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// finally generate signatures for all our inputs to the funding transaction,
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// and for the remote node's version of the commitment transaction.
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type addContributionMsg struct {
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pendingFundingID uint64
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// TODO(roasbeef): Should also carry SPV proofs in we're in SPV mode
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contribution *ChannelContribution
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err chan error // Buffered
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// NOTE: In order to avoid deadlocks, this channel MUST be buffered.
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err chan error
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}
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// partiallySignedFundingState...
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type partiallySignedFundingState struct {
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// In order of sorted inputs that are ours. Sorting is done in accordance
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// to BIP-69: https://github.com/bitcoin/bips/blob/master/bip-0069.mediawiki.
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OurSigs [][]byte
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NormalizedTxID wire.ShaHash
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}
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// addCounterPartySigsMsg...
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// addCounterPartySigsMsg represents the final message required to complete,
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// and 'open' a payment channel. This message carries the counterparty's
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// signatures for each of their inputs to the funding transaction, and also a
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// signature allowing us to spend our version of the commitment transaction.
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// If we're able to verify all the signatures are valid, the funding transaction
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// will be broadcast to the network. After the funding transaction gains a
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// configurable number of confirmations, the channel is officially considered
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// 'open'.
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type addCounterPartySigsMsg struct {
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pendingFundingID uint64
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// Should be order of sorted inputs that are theirs. Sorting is done in accordance
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// to BIP-69: https://github.com/bitcoin/bips/blob/master/bip-0069.mediawiki.
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// Should be order of sorted inputs that are theirs. Sorting is done
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// in accordance to BIP-69:
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// https://github.com/bitcoin/bips/blob/master/bip-0069.mediawiki.
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theirFundingSigs [][]byte
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// This should be 1/2 of the signatures needed to succesfully spend our
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// version of the commitment transaction.
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theirCommitmentSig []byte
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err chan error // Buffered
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// NOTE: In order to avoid deadlocks, this channel MUST be buffered.
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err chan error
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}
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// LightningWallet....
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// responsible for internal global (from the point of view of a user/node)
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// channel state. Requests to modify this state come in via messages over
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// channels, same with replies.
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// Embedded wallet backed by boltdb...
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// LightningWallet is a domain specific, yet general Bitcoin wallet capable of
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// executing workflow required to interact with the Lightning Network. It is
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// domain specific in the sense that it understands all the fancy scripts used
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// within the Lightning Network, channel lifetimes, etc. However, it embedds a
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// general purpose Bitcoin wallet within it. Therefore, it is also able to serve
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// as a regular Bitcoin wallet which uses HD keys. The wallet is highly concurrent
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// internally. All communication, and requests towards the wallet are
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// dispatched as messages over channels, ensuring thread safety across all
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// operations. Interaction has been designed independant of any peer-to-peer
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// communication protocol, allowing the wallet to be self-contained and embeddable
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// within future projects interacting with the Lightning Network.
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// NOTE: At the moment the wallet requires a btcd full node, as it's dependant
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// on btcd's websockets notifications as even triggers during the lifetime of
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// a channel. However, once the chainntnfs package is complete, the wallet
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// will be compatible with multiple RPC/notification services such as Electrum,
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// Bitcoin Core + ZeroMQ, etc. Eventually, the wallet won't require a full-node
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// at all, as SPV support is integrated inot btcwallet.
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type LightningWallet struct {
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// TODO(roasbeef): add btcwallet/chain for notifications initially, then
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// abstract out in order to accomodate zeroMQ/BitcoinCore
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lmtx sync.RWMutex
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// This mutex is to be held when generating external keys to be used
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// as multi-sig, and commitment keys within the channel.
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keyGenMtx sync.RWMutex
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DB walletdb.DB
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// This mutex MUST be held when performing coin selection in order to
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// avoid inadvertently creating multiple funding transaction which
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// double spend inputs accross each other.
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coinSelectMtx sync.RWMutex
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// A wrapper around a namespace within boltdb reserved for ln-based
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// wallet meta-data.
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channelDB *channeldb.DB
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// wallet meta-data. See the 'channeldb' package for further
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// information.
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ChannelDB *channeldb.DB
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db walletdb.DB
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// The core wallet, all non Lightning Network specific interaction is
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// proxied to the internal wallet.
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// TODO(roasbeef): Why isn't this just embedded again?
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wallet *btcwallet.Wallet
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// An active RPC connection to a full-node. In the case of a btcd node,
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// websockets are used for notifications. If using Bitcoin Core,
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// notifications are either generated via long-polling or the usage of
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// ZeroMQ.
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rpc *chain.Client
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// All messages to the wallet are to be sent accross this channel.
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msgChan chan interface{}
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// Incomplete payment channels are stored in the map below. An intent
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// to create a payment channel is tracked as a "reservation" within
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// limbo. Once the final signatures have been exchanged, a reservation
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// is removed from limbo. Each reservation is tracked by a unique
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// monotonically integer. All requests concerning the channel MUST
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// carry a valid, active funding ID.
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fundingLimbo map[uint64]*ChannelReservation
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nextFundingID uint64
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limboMtx sync.RWMutex
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// TODO(roasbeef): zombie garbage collection routine to solve
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// lost-object/starvation problem/attack.
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limboMtx sync.RWMutex
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nextFundingID uint64
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fundingLimbo map[uint64]*ChannelReservation
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started int32
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shutdown int32
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quit chan struct{}
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wg sync.WaitGroup
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@ -167,7 +237,9 @@ type LightningWallet struct {
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// TODO(roasbeef): handle wallet lock/unlock
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}
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// NewLightningWallet...
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// NewLightningWallet creates/opens and initializes a LightningWallet instance.
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// If the wallet has never been created (according to the passed dataDir), first-time
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// setup is executed.
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// TODO(roasbeef): fin...add config
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func NewLightningWallet(privWalletPass, pubWalletPass, hdSeed []byte, dataDir string) (*LightningWallet, error) {
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// Ensure the wallet exists or create it when the create flag is set.
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@ -214,9 +286,9 @@ func NewLightningWallet(privWalletPass, pubWalletPass, hdSeed []byte, dataDir st
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// TODO(roasbeef): logging
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return &LightningWallet{
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DB: db,
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db: db,
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wallet: wallet,
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channelDB: channeldb.New(wallet.Manager, lnNamespace),
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ChannelDB: channeldb.New(wallet.Manager, lnNamespace),
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msgChan: make(chan interface{}, msgBufferSize),
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// TODO(roasbeef): make this atomic.Uint32 instead? Which is
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// faster, locks or CAS? I'm guessing CAS because assembly:
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@ -227,7 +299,8 @@ func NewLightningWallet(privWalletPass, pubWalletPass, hdSeed []byte, dataDir st
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}, nil
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}
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// Start...
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// Start establishes a connection to the RPC source, and spins up all
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// goroutines required to handle incoming messages.
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func (l *LightningWallet) Start() error {
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// Already started?
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if atomic.AddInt32(&l.started, 1) != 1 {
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@ -252,7 +325,7 @@ func (l *LightningWallet) Start() error {
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return nil
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}
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// Stop...
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// Stop gracefully shutsdown the wallet, and all active goroutines.
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func (l *LightningWallet) Stop() error {
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if atomic.AddInt32(&l.shutdown, 1) != 1 {
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return nil
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@ -266,7 +339,8 @@ func (l *LightningWallet) Stop() error {
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return nil
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}
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// requestHandler....
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// requestHandler is the primary goroutine(s) resposible for handling, and
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// dispatching relies to all messages.
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func (l *LightningWallet) requestHandler() {
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out:
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for {
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@ -291,21 +365,33 @@ out:
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l.wg.Done()
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}
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// InitChannelReservation...
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// fields set after completion:
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// * ourInputs
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// * ourChange
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// * ourMultisigKey
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// * ourCommitKey
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// * ourDeliveryAddress
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// * ourShaChain
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func (l *LightningWallet) InitChannelReservation(a btcutil.Amount, t FundingType, theirID [32]byte) (*ChannelReservation, error) {
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// InitChannelReservation kicks off the 3-step workflow required to succesfully
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// open a payment channel with a remote node. As part of the funding
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// reservation, the inputs selected for the funding transaction are 'locked'.
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// This ensures that multiple channel reservations aren't double spending the
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// same inputs in the funding transaction. If reservation initialization is
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// succesful, a ChannelReservation containing our completed contribution is
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// returned. Our contribution contains all the items neccessary to allow the
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// counter party to build the funding transaction, and both versions of the
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// commitment transaction. Otherwise, an error occured a nil pointer along with
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// an error are returned.
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//
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// Once a ChannelReservation has been obtained, two
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// additional steps must be processed before a payment channel can be considered
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// 'open'. The second step validates, and processes the counterparty's channel
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// contribution. The third, and final step verifies all signatures for the inputs
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// of the funding transaction, and that the signature we records for our version
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// of the commitment transaction is valid.
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func (l *LightningWallet) InitChannelReservation(a btcutil.Amount, t FundingType,
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theirID [32]byte, csvDelay uint32) (*ChannelReservation, error) {
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errChan := make(chan error, 1)
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respChan := make(chan *ChannelReservation, 1)
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l.msgChan <- &initFundingReserveMsg{
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fundingAmount: a,
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fundingType: t,
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csvDelay: csvDelay,
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nodeID: theirID,
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err: errChan,
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resp: respChan,
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@ -314,7 +400,8 @@ func (l *LightningWallet) InitChannelReservation(a btcutil.Amount, t FundingType
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return <-respChan, <-errChan
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}
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// handleFundingReserveRequest...
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// handleFundingReserveRequest processes a message intending to create, and
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// validate a funding reservation request.
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func (l *LightningWallet) handleFundingReserveRequest(req *initFundingReserveMsg) {
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// Create a limbo and record entry for this newly pending funding request.
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l.limboMtx.Lock()
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@ -332,6 +419,8 @@ func (l *LightningWallet) handleFundingReserveRequest(req *initFundingReserveMsg
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reservation.partialState.TheirLNID = req.nodeID
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ourContribution := reservation.ourContribution
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ourContribution.CsvDelay = req.csvDelay
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// We hold the coin select mutex while querying for outputs, and
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// performing coin selection in order to avoid inadvertent double spends
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// accross funding transactions.
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@ -462,7 +551,10 @@ func (l *LightningWallet) handleFundingReserveRequest(req *initFundingReserveMsg
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reservation.partialState.OurDeliveryAddress = addrs[0].Address()
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ourContribution.DeliveryAddress = addrs[0].Address()
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// Create a new shaChain for verifiable transaction revocations.
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// Create a new shaChain for verifiable transaction revocations. This
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// will be used to generate revocation hashes for our past/current
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// commitment transactions once we start to make payments within the
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// channel.
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shaChain, err := shachain.NewFromSeed(nil, 0)
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if err != nil {
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req.err <- err
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@ -479,7 +571,10 @@ func (l *LightningWallet) handleFundingReserveRequest(req *initFundingReserveMsg
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req.err <- nil
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}
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// handleFundingReserveCancel...
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// handleFundingReserveCancel cancels an existing channel reservation. As part
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// of the cancellation, outputs previously selected as inputs for the funding
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// transaction via coin selection are freed allowing future reservations to
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// include them.
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func (l *LightningWallet) handleFundingCancelRequest(req *fundingReserveCancelMsg) {
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// TODO(roasbeef): holding lock too long
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// RLOCK?
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@ -513,7 +608,11 @@ func (l *LightningWallet) handleFundingCancelRequest(req *fundingReserveCancelMs
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req.err <- nil
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}
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// handleFundingCounterPartyFunds...
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// handleFundingCounterPartyFunds processes the second workflow step for the
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// lifetime of a channel reservation. Upon completion, the reservation will
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// carry a completed funding transaction (minus the counterparty's input
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// signatures), both versions of the commitment transaction, and our signature
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// for their version of the commitment transaction.
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func (l *LightningWallet) handleContributionMsg(req *addContributionMsg) {
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l.limboMtx.Lock()
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pendingReservation, ok := l.fundingLimbo[req.pendingFundingID]
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@ -532,6 +631,7 @@ func (l *LightningWallet) handleContributionMsg(req *addContributionMsg) {
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pendingReservation.partialState.FundingTx = wire.NewMsgTx()
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fundingTx := pendingReservation.partialState.FundingTx
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// Some temporary variables to cut down on the resolution verbosity.
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pendingReservation.theirContribution = req.contribution
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theirContribution := req.contribution
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ourContribution := pendingReservation.ourContribution
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@ -558,11 +658,11 @@ func (l *LightningWallet) handleContributionMsg(req *addContributionMsg) {
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fundingTx.AddTxOut(theirChangeOutput)
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}
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// Finally, add the 2-of-2 multi-sig output which will set up the lightning
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// channel.
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ourKey := pendingReservation.partialState.MultiSigKey
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theirKey := theirContribution.MultiSigKey
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// Finally, add the 2-of-2 multi-sig output which will set up the lightning
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// channel.
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channelCapacity := int64(pendingReservation.partialState.Capacity)
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redeemScript, multiSigOut, err := fundMultiSigOut(ourKey.PubKey().SerializeCompressed(),
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theirKey.SerializeCompressed(), channelCapacity)
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@ -586,7 +686,7 @@ func (l *LightningWallet) handleContributionMsg(req *addContributionMsg) {
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// TODO(roasbeef): this isn't the normalized txid, this isn't recursive...
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// pendingReservation.normalizedTxID = pendingReservation.fundingTx.TxSha()
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// Now, sign all inputs that are ours, collecting the signatures in
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// Next, sign all inputs that are ours, collecting the signatures in
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// order of the inputs.
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pendingReservation.ourFundingSigs = make([][]byte, 0, len(ourContribution.Inputs))
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for i, txIn := range fundingTx.TxIn {
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@ -637,7 +737,7 @@ func (l *LightningWallet) handleContributionMsg(req *addContributionMsg) {
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pendingReservation.partialState.TheirCurrentRevocation = theirContribution.RevocationHash
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// Grab the hash of the current pre-image in our chain, this is needed
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// for out commitment tx.
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// for our commitment tx.
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// TODO(roasbeef): grab partial state above to avoid long attr chain
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||||
ourCurrentRevokeHash := pendingReservation.partialState.OurShaChain.CurrentRevocationHash()
|
||||
ourContribution.RevocationHash = ourCurrentRevokeHash
|
||||
@ -667,6 +767,7 @@ func (l *LightningWallet) handleContributionMsg(req *addContributionMsg) {
|
||||
return
|
||||
}
|
||||
|
||||
// Record newly available information witin the open channel state.
|
||||
pendingReservation.partialState.CsvDelay = theirContribution.CsvDelay
|
||||
pendingReservation.partialState.TheirDeliveryAddress = theirContribution.DeliveryAddress
|
||||
pendingReservation.partialState.ChanID = fundingNTxid
|
||||
@ -687,7 +788,13 @@ func (l *LightningWallet) handleContributionMsg(req *addContributionMsg) {
|
||||
req.err <- nil
|
||||
}
|
||||
|
||||
// handleFundingCounterPartySigs...
|
||||
// handleFundingCounterPartySigs is the final step in the channel reservation
|
||||
// workflow. During this setp, we validate *all* the received signatures for
|
||||
// inputs to the funding transaction. If any of these are invalid, we bail,
|
||||
// and forcibly cancel this funding request. Additionally, we ensure that the
|
||||
// signature we received from the counterparty for our version of the commitment
|
||||
// transaction allows us to spend from the funding output with the addition of
|
||||
// our signature.
|
||||
func (l *LightningWallet) handleFundingCounterPartySigs(msg *addCounterPartySigsMsg) {
|
||||
l.limboMtx.RLock()
|
||||
pendingReservation, ok := l.fundingLimbo[msg.pendingFundingID]
|
||||
@ -709,6 +816,7 @@ func (l *LightningWallet) handleFundingCounterPartySigs(msg *addCounterPartySigs
|
||||
if txin.SignatureScript == nil {
|
||||
txin.SignatureScript = pendingReservation.theirFundingSigs[i]
|
||||
|
||||
// TODO(roasbeef): uncomment after nodetest is finished.
|
||||
/*// Fetch the alleged previous output along with the
|
||||
// pkscript referenced by this input.
|
||||
prevOut := txin.PreviousOutPoint
|
||||
@ -823,11 +931,13 @@ func (l *LightningWallet) handleFundingCounterPartySigs(msg *addCounterPartySigs
|
||||
msg.err <- err
|
||||
}
|
||||
|
||||
// nextMultiSigKey...
|
||||
// getNextRawKey retrieves the next key within our HD key-chain for use within
|
||||
// as a multi-sig key within the funding transaction, or within the commitment
|
||||
// transaction's outputs.
|
||||
// TODO(roasbeef): on shutdown, write state of pending keys, then read back?
|
||||
func (l *LightningWallet) getNextRawKey() (*btcec.PrivateKey, error) {
|
||||
l.lmtx.Lock()
|
||||
defer l.lmtx.Unlock()
|
||||
l.keyGenMtx.Lock()
|
||||
defer l.keyGenMtx.Unlock()
|
||||
|
||||
nextAddr, err := l.wallet.Manager.NextExternalAddresses(waddrmgr.DefaultAccountNum, 1)
|
||||
if err != nil {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user