lotus/paychmgr/manager.go

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package paychmgr
import (
"context"
"errors"
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"sync"
"github.com/ipfs/go-cid"
"github.com/ipfs/go-datastore"
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logging "github.com/ipfs/go-log/v2"
"golang.org/x/xerrors"
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"github.com/filecoin-project/go-address"
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"github.com/filecoin-project/go-state-types/abi"
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paychtypes "github.com/filecoin-project/go-state-types/builtin/v8/paych"
"github.com/filecoin-project/go-state-types/crypto"
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"github.com/filecoin-project/go-state-types/network"
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"github.com/filecoin-project/lotus/api"
"github.com/filecoin-project/lotus/chain/actors/builtin/paych"
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"github.com/filecoin-project/lotus/chain/stmgr"
"github.com/filecoin-project/lotus/chain/types"
)
var log = logging.Logger("paych")
var errProofNotSupported = errors.New("payment channel proof parameter is not supported")
// stateManagerAPI defines the methods needed from StateManager
type stateManagerAPI interface {
ResolveToDeterministicAddress(ctx context.Context, addr address.Address, ts *types.TipSet) (address.Address, error)
GetPaychState(ctx context.Context, addr address.Address, ts *types.TipSet) (*types.Actor, paych.State, error)
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Call(ctx context.Context, msg *types.Message, ts *types.TipSet) (*api.InvocResult, error)
}
// paychAPI defines the API methods needed by the payment channel manager
type PaychAPI interface {
StateAccountKey(context.Context, address.Address, types.TipSetKey) (address.Address, error)
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StateWaitMsg(ctx context.Context, cid cid.Cid, confidence uint64, limit abi.ChainEpoch, allowReplaced bool) (*api.MsgLookup, error)
MpoolPushMessage(ctx context.Context, msg *types.Message, maxFee *api.MessageSendSpec) (*types.SignedMessage, error)
WalletHas(ctx context.Context, addr address.Address) (bool, error)
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WalletSign(ctx context.Context, k address.Address, msg []byte) (*crypto.Signature, error)
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StateNetworkVersion(context.Context, types.TipSetKey) (network.Version, error)
}
// managerAPI defines all methods needed by the manager
type managerAPI interface {
stateManagerAPI
PaychAPI
}
// managerAPIImpl is used to create a composite that implements managerAPI
type managerAPIImpl struct {
stmgr.StateManagerAPI
PaychAPI
}
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type Manager struct {
// The Manager context is used to terminate wait operations on shutdown
ctx context.Context
shutdown context.CancelFunc
store *Store
sa *stateAccessor
pchapi managerAPI
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lk sync.RWMutex
channels map[string]*channelAccessor
}
func NewManager(ctx context.Context, shutdown func(), sm stmgr.StateManagerAPI, pchstore *Store, api PaychAPI) *Manager {
impl := &managerAPIImpl{StateManagerAPI: sm, PaychAPI: api}
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return &Manager{
ctx: ctx,
shutdown: shutdown,
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store: pchstore,
sa: &stateAccessor{sm: impl},
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channels: make(map[string]*channelAccessor),
pchapi: impl,
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}
}
// newManager is used by the tests to supply mocks
func newManager(pchstore *Store, pchapi managerAPI) (*Manager, error) {
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pm := &Manager{
store: pchstore,
sa: &stateAccessor{sm: pchapi},
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channels: make(map[string]*channelAccessor),
pchapi: pchapi,
}
pm.ctx, pm.shutdown = context.WithCancel(context.Background())
return pm, pm.Start()
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}
// Start restarts tracking of any messages that were sent to chain.
func (pm *Manager) Start() error {
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return pm.restartPending(pm.ctx)
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}
// Stop shuts down any processes used by the manager
func (pm *Manager) Stop() error {
pm.shutdown()
return nil
}
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type GetOpts struct {
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Reserve bool
OffChain bool
}
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func (pm *Manager) GetPaych(ctx context.Context, from, to address.Address, amt types.BigInt, opts GetOpts) (address.Address, cid.Cid, error) {
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if !opts.Reserve && opts.OffChain {
return address.Undef, cid.Undef, xerrors.Errorf("can't fund payment channels without on-chain operations")
}
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chanAccessor, err := pm.accessorByFromTo(from, to)
if err != nil {
return address.Undef, cid.Undef, err
}
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return chanAccessor.getPaych(ctx, amt, opts)
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}
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func (pm *Manager) AvailableFunds(ctx context.Context, ch address.Address) (*api.ChannelAvailableFunds, error) {
ca, err := pm.accessorByAddress(ctx, ch)
if err != nil {
return nil, err
}
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ci, err := ca.getChannelInfo(ctx, ch)
if err != nil {
return nil, err
}
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return ca.availableFunds(ctx, ci.ChannelID)
}
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func (pm *Manager) AvailableFundsByFromTo(ctx context.Context, from address.Address, to address.Address) (*api.ChannelAvailableFunds, error) {
ca, err := pm.accessorByFromTo(from, to)
if err != nil {
return nil, err
}
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ci, err := ca.outboundActiveByFromTo(ctx, from, to)
if err == ErrChannelNotTracked {
// If there is no active channel between from / to we still want to
// return an empty ChannelAvailableFunds, so that clients can check
// for the existence of a channel between from / to without getting
// an error.
return &api.ChannelAvailableFunds{
Channel: nil,
From: from,
To: to,
ConfirmedAmt: types.NewInt(0),
PendingAmt: types.NewInt(0),
NonReservedAmt: types.NewInt(0),
PendingAvailableAmt: types.NewInt(0),
PendingWaitSentinel: nil,
QueuedAmt: types.NewInt(0),
VoucherReedeemedAmt: types.NewInt(0),
}, nil
}
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if err != nil {
return nil, err
}
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return ca.availableFunds(ctx, ci.ChannelID)
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}
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// GetPaychWaitReady waits until the create channel / add funds message with the
// given message CID arrives.
// The returned channel address can safely be used against the Manager methods.
func (pm *Manager) GetPaychWaitReady(ctx context.Context, mcid cid.Cid) (address.Address, error) {
// Find the channel associated with the message CID
pm.lk.Lock()
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ci, err := pm.store.ByMessageCid(ctx, mcid)
pm.lk.Unlock()
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if err != nil {
if err == datastore.ErrNotFound {
return address.Undef, xerrors.Errorf("Could not find wait msg cid %s", mcid)
}
return address.Undef, err
}
chanAccessor, err := pm.accessorByFromTo(ci.Control, ci.Target)
if err != nil {
return address.Undef, err
}
return chanAccessor.getPaychWaitReady(ctx, mcid)
}
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func (pm *Manager) ListChannels(ctx context.Context) ([]address.Address, error) {
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// Need to take an exclusive lock here so that channel operations can't run
// in parallel (see channelLock)
pm.lk.Lock()
defer pm.lk.Unlock()
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return pm.store.ListChannels(ctx)
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}
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func (pm *Manager) GetChannelInfo(ctx context.Context, addr address.Address) (*ChannelInfo, error) {
ca, err := pm.accessorByAddress(ctx, addr)
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if err != nil {
return nil, err
}
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return ca.getChannelInfo(ctx, addr)
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}
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func (pm *Manager) CreateVoucher(ctx context.Context, ch address.Address, voucher paychtypes.SignedVoucher) (*api.VoucherCreateResult, error) {
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ca, err := pm.accessorByAddress(ctx, ch)
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if err != nil {
return nil, err
}
return ca.createVoucher(ctx, ch, voucher)
}
// CheckVoucherValid checks if the given voucher is valid (is or could become spendable at some point).
// If the channel is not in the store, fetches the channel from state (and checks that
// the channel To address is owned by the wallet).
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func (pm *Manager) CheckVoucherValid(ctx context.Context, ch address.Address, sv *paychtypes.SignedVoucher) error {
// Get an accessor for the channel, creating it from state if necessary
ca, err := pm.inboundChannelAccessor(ctx, ch)
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if err != nil {
return err
}
_, err = ca.checkVoucherValid(ctx, ch, sv)
return err
}
// CheckVoucherSpendable checks if the given voucher is currently spendable
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func (pm *Manager) CheckVoucherSpendable(ctx context.Context, ch address.Address, sv *paychtypes.SignedVoucher, secret []byte, proof []byte) (bool, error) {
if len(proof) > 0 {
return false, errProofNotSupported
}
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ca, err := pm.accessorByAddress(ctx, ch)
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if err != nil {
return false, err
}
return ca.checkVoucherSpendable(ctx, ch, sv, secret)
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}
// AddVoucherOutbound adds a voucher for an outbound channel.
// Returns an error if the channel is not already in the store.
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func (pm *Manager) AddVoucherOutbound(ctx context.Context, ch address.Address, sv *paychtypes.SignedVoucher, proof []byte, minDelta types.BigInt) (types.BigInt, error) {
if len(proof) > 0 {
return types.NewInt(0), errProofNotSupported
}
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ca, err := pm.accessorByAddress(ctx, ch)
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if err != nil {
return types.NewInt(0), err
}
return ca.addVoucher(ctx, ch, sv, minDelta)
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}
// AddVoucherInbound adds a voucher for an inbound channel.
// If the channel is not in the store, fetches the channel from state (and checks that
// the channel To address is owned by the wallet).
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func (pm *Manager) AddVoucherInbound(ctx context.Context, ch address.Address, sv *paychtypes.SignedVoucher, proof []byte, minDelta types.BigInt) (types.BigInt, error) {
if len(proof) > 0 {
return types.NewInt(0), errProofNotSupported
}
// Get an accessor for the channel, creating it from state if necessary
ca, err := pm.inboundChannelAccessor(ctx, ch)
if err != nil {
return types.BigInt{}, err
}
return ca.addVoucher(ctx, ch, sv, minDelta)
}
// inboundChannelAccessor gets an accessor for the given channel. The channel
// must either exist in the store, or be an inbound channel that can be created
// from state.
func (pm *Manager) inboundChannelAccessor(ctx context.Context, ch address.Address) (*channelAccessor, error) {
// Make sure channel is in store, or can be fetched from state, and that
// the channel To address is owned by the wallet
ci, err := pm.trackInboundChannel(ctx, ch)
if err != nil {
return nil, err
}
// This is an inbound channel, so To is the Control address (this node)
from := ci.Target
to := ci.Control
return pm.accessorByFromTo(from, to)
}
func (pm *Manager) trackInboundChannel(ctx context.Context, ch address.Address) (*ChannelInfo, error) {
// Need to take an exclusive lock here so that channel operations can't run
// in parallel (see channelLock)
pm.lk.Lock()
defer pm.lk.Unlock()
// Check if channel is in store
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ci, err := pm.store.ByAddress(ctx, ch)
if err == nil {
// Channel is in store, so it's already being tracked
return ci, nil
}
// If there's an error (besides channel not in store) return err
if err != ErrChannelNotTracked {
return nil, err
}
// Channel is not in store, so get channel from state
stateCi, err := pm.sa.loadStateChannelInfo(ctx, ch, DirInbound)
if err != nil {
return nil, err
}
// Check that channel To address is in wallet
to := stateCi.Control // Inbound channel so To addr is Control (this node)
toKey, err := pm.pchapi.StateAccountKey(ctx, to, types.EmptyTSK)
if err != nil {
return nil, err
}
has, err := pm.pchapi.WalletHas(ctx, toKey)
if err != nil {
return nil, err
}
if !has {
msg := "cannot add voucher for channel %s: wallet does not have key for address %s"
return nil, xerrors.Errorf(msg, ch, to)
}
// Save channel to store
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return pm.store.TrackChannel(ctx, stateCi)
}
// TODO: secret vs proof doesn't make sense, there is only one, not two
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func (pm *Manager) SubmitVoucher(ctx context.Context, ch address.Address, sv *paychtypes.SignedVoucher, secret []byte, proof []byte) (cid.Cid, error) {
if len(proof) > 0 {
return cid.Undef, errProofNotSupported
}
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ca, err := pm.accessorByAddress(ctx, ch)
if err != nil {
return cid.Undef, err
}
return ca.submitVoucher(ctx, ch, sv, secret)
}
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func (pm *Manager) AllocateLane(ctx context.Context, ch address.Address) (uint64, error) {
ca, err := pm.accessorByAddress(ctx, ch)
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if err != nil {
return 0, err
}
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return ca.allocateLane(ctx, ch)
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}
func (pm *Manager) ListVouchers(ctx context.Context, ch address.Address) ([]*VoucherInfo, error) {
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ca, err := pm.accessorByAddress(ctx, ch)
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if err != nil {
return nil, err
}
return ca.listVouchers(ctx, ch)
}
func (pm *Manager) Settle(ctx context.Context, addr address.Address) (cid.Cid, error) {
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ca, err := pm.accessorByAddress(ctx, addr)
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if err != nil {
return cid.Undef, err
}
return ca.settle(ctx, addr)
}
func (pm *Manager) Collect(ctx context.Context, addr address.Address) (cid.Cid, error) {
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ca, err := pm.accessorByAddress(ctx, addr)
if err != nil {
return cid.Undef, err
}
return ca.collect(ctx, addr)
}