lotus/chain/market/fundmanager.go

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package market
import (
"context"
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"fmt"
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"sync"
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"github.com/filecoin-project/go-address"
"github.com/filecoin-project/go-state-types/abi"
"github.com/filecoin-project/lotus/api"
"github.com/filecoin-project/lotus/build"
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"github.com/filecoin-project/lotus/chain/actors"
"github.com/filecoin-project/lotus/chain/actors/builtin/market"
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"github.com/filecoin-project/lotus/chain/types"
"github.com/filecoin-project/lotus/node/impl/full"
"github.com/filecoin-project/lotus/node/modules/dtypes"
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"github.com/ipfs/go-cid"
"github.com/ipfs/go-datastore"
logging "github.com/ipfs/go-log"
"go.uber.org/fx"
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"golang.org/x/xerrors"
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)
var log = logging.Logger("market_adapter")
// API is the fx dependencies need to run a fund manager
type FundManagerAPI struct {
fx.In
full.StateAPI
full.MpoolAPI
}
// fundManagerAPI is the specific methods called by the FundManager
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// (used by the tests)
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type fundManagerAPI interface {
MpoolPushMessage(context.Context, *types.Message, *api.MessageSendSpec) (*types.SignedMessage, error)
StateMarketBalance(context.Context, address.Address, types.TipSetKey) (api.MarketBalance, error)
StateWaitMsg(ctx context.Context, cid cid.Cid, confidence uint64) (*api.MsgLookup, error)
}
// FundManager keeps track of funds in a set of addresses
type FundManager struct {
ctx context.Context
shutdown context.CancelFunc
api fundManagerAPI
str *Store
lk sync.Mutex
fundedAddrs map[address.Address]*fundedAddress
}
func NewFundManager(lc fx.Lifecycle, api FundManagerAPI, ds dtypes.MetadataDS) *FundManager {
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fm := newFundManager(&api, ds)
lc.Append(fx.Hook{
OnStart: func(ctx context.Context) error {
return fm.Start()
},
OnStop: func(ctx context.Context) error {
fm.Stop()
return nil
},
})
return fm
}
// newFundManager is used by the tests
func newFundManager(api fundManagerAPI, ds datastore.Batching) *FundManager {
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ctx, cancel := context.WithCancel(context.Background())
return &FundManager{
ctx: ctx,
shutdown: cancel,
api: api,
str: newStore(ds),
fundedAddrs: make(map[address.Address]*fundedAddress),
}
}
func (fm *FundManager) Stop() {
fm.shutdown()
}
func (fm *FundManager) Start() error {
fm.lk.Lock()
defer fm.lk.Unlock()
// TODO:
// To save memory:
// - in State() only load addresses with in-progress messages
// - load the others just-in-time from getFundedAddress
// - delete(fm.fundedAddrs, addr) when the queue has been processed
return fm.str.forEach(func(state *FundedAddressState) {
fa := newFundedAddress(fm, state.Addr)
fa.state = state
fm.fundedAddrs[fa.state.Addr] = fa
fa.start()
})
}
// Creates a fundedAddress if it doesn't already exist, and returns it
func (fm *FundManager) getFundedAddress(addr address.Address) *fundedAddress {
fm.lk.Lock()
defer fm.lk.Unlock()
fa, ok := fm.fundedAddrs[addr]
if !ok {
fa = newFundedAddress(fm, addr)
fm.fundedAddrs[addr] = fa
}
return fa
}
// Reserve adds amt to `reserved`. If there are not enough available funds for
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// the address, submits a message on chain to top up available funds.
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// Returns the cid of the message that was submitted on chain, or cid.Undef if
// the required funds were already available.
func (fm *FundManager) Reserve(ctx context.Context, wallet, addr address.Address, amt abi.TokenAmount) (cid.Cid, error) {
return fm.getFundedAddress(addr).reserve(ctx, wallet, amt)
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}
// Subtract from `reserved`.
func (fm *FundManager) Release(addr address.Address, amt abi.TokenAmount) error {
return fm.getFundedAddress(addr).release(amt)
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}
// Withdraw unreserved funds. Only succeeds if there are enough unreserved
// funds for the address.
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// Returns the cid of the message that was submitted on chain.
func (fm *FundManager) Withdraw(ctx context.Context, wallet, addr address.Address, amt abi.TokenAmount) (cid.Cid, error) {
return fm.getFundedAddress(addr).withdraw(ctx, wallet, amt)
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}
// GetReserved returns the amount that is currently reserved for the address
func (fm *FundManager) GetReserved(addr address.Address) abi.TokenAmount {
return fm.getFundedAddress(addr).getReserved()
}
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// FundedAddressState keeps track of the state of an address with funds in the
// datastore
type FundedAddressState struct {
Addr address.Address
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// AmtReserved is the amount that must be kept in the address (cannot be
// withdrawn)
AmtReserved abi.TokenAmount
// MsgCid is the cid of an in-progress on-chain message
MsgCid *cid.Cid
}
// fundedAddress keeps track of the state and request queues for a
// particular address
type fundedAddress struct {
ctx context.Context
env *fundManagerEnvironment
str *Store
lk sync.RWMutex
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state *FundedAddressState
// Note: These request queues are ephemeral, they are not saved to store
reservations []*fundRequest
releases []*fundRequest
withdrawals []*fundRequest
// Used by the tests
onProcessStartListener func() bool
}
func newFundedAddress(fm *FundManager, addr address.Address) *fundedAddress {
return &fundedAddress{
ctx: fm.ctx,
env: &fundManagerEnvironment{api: fm.api},
str: fm.str,
state: &FundedAddressState{
Addr: addr,
AmtReserved: abi.NewTokenAmount(0),
},
}
}
// If there is an in-progress on-chain message, don't submit any more messages
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// on chain until it completes
func (a *fundedAddress) start() {
a.lk.Lock()
defer a.lk.Unlock()
if a.state.MsgCid != nil {
a.debugf("restart: wait for %s", a.state.MsgCid)
a.startWaitForResults(*a.state.MsgCid)
}
}
func (a *fundedAddress) getReserved() abi.TokenAmount {
a.lk.RLock()
defer a.lk.RUnlock()
return a.state.AmtReserved
}
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func (a *fundedAddress) reserve(ctx context.Context, wallet address.Address, amt abi.TokenAmount) (cid.Cid, error) {
return a.requestAndWait(ctx, wallet, amt, &a.reservations)
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}
func (a *fundedAddress) release(amt abi.TokenAmount) error {
_, err := a.requestAndWait(context.Background(), address.Undef, amt, &a.releases)
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return err
}
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func (a *fundedAddress) withdraw(ctx context.Context, wallet address.Address, amt abi.TokenAmount) (cid.Cid, error) {
return a.requestAndWait(ctx, wallet, amt, &a.withdrawals)
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}
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func (a *fundedAddress) requestAndWait(ctx context.Context, wallet address.Address, amt abi.TokenAmount, reqs *[]*fundRequest) (cid.Cid, error) {
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// Create a request and add it to the request queue
req := newFundRequest(ctx, wallet, amt)
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a.lk.Lock()
*reqs = append(*reqs, req)
a.lk.Unlock()
// Process the queue
go a.process()
// Wait for the results
select {
case <-ctx.Done():
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return cid.Undef, ctx.Err()
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case r := <-req.Result:
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return r.msgCid, r.err
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}
}
// Used by the tests
func (a *fundedAddress) onProcessStart(fn func() bool) {
a.lk.Lock()
defer a.lk.Unlock()
a.onProcessStartListener = fn
}
// Process queued requests
func (a *fundedAddress) process() {
a.lk.Lock()
defer a.lk.Unlock()
// Used by the tests
if a.onProcessStartListener != nil {
done := a.onProcessStartListener()
if !done {
return
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}
a.onProcessStartListener = nil
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}
// Check if we're still waiting for the response to a message
if a.state.MsgCid != nil {
return
}
// Check if there's anything to do
haveReservations := len(a.reservations) > 0 || len(a.releases) > 0
haveWithdrawals := len(a.withdrawals) > 0
if !haveReservations && !haveWithdrawals {
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return
}
// Process reservations / releases
if haveReservations {
res, err := a.processReservations(a.reservations, a.releases)
if err == nil {
a.applyStateChange(res.msgCid, res.amtReserved)
}
a.reservations = filterOutProcessedReqs(a.reservations)
a.releases = filterOutProcessedReqs(a.releases)
}
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// If there was no message sent on chain by adding reservations, and all
// reservations have completed processing, process withdrawals
if haveWithdrawals && a.state.MsgCid == nil && len(a.reservations) == 0 {
withdrawalCid, err := a.processWithdrawals(a.withdrawals)
if err == nil && withdrawalCid != cid.Undef {
a.applyStateChange(&withdrawalCid, types.EmptyInt)
}
a.withdrawals = filterOutProcessedReqs(a.withdrawals)
}
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// If a message was sent on-chain
if a.state.MsgCid != nil {
// Start waiting for results of message (async)
a.startWaitForResults(*a.state.MsgCid)
}
// Process any remaining queued requests
go a.process()
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}
// Filter out completed requests
func filterOutProcessedReqs(reqs []*fundRequest) []*fundRequest {
filtered := make([]*fundRequest, 0, len(reqs))
for _, req := range reqs {
if !req.Completed() {
filtered = append(filtered, req)
}
}
return filtered
}
// Apply the results of processing queues and save to the datastore
func (a *fundedAddress) applyStateChange(msgCid *cid.Cid, amtReserved abi.TokenAmount) {
a.state.MsgCid = msgCid
if !amtReserved.Nil() {
a.state.AmtReserved = amtReserved
}
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a.saveState()
}
// Clear the pending message cid so that a new message can be sent
func (a *fundedAddress) clearWaitState() {
a.state.MsgCid = nil
a.saveState()
}
// Save state to datastore
func (a *fundedAddress) saveState() {
// Not much we can do if saving to the datastore fails, just log
err := a.str.save(a.state)
if err != nil {
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log.Errorf("saving state to store for addr %s: %v", a.state.Addr, err)
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}
}
// The result of processing the reservation / release queues
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type processResult struct {
// Requests that completed without adding funds
covered []*fundRequest
// Requests that added funds
added []*fundRequest
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// The new reserved amount
amtReserved abi.TokenAmount
// The message cid, if a message was submitted on-chain
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msgCid *cid.Cid
}
// process reservations and releases, and return the resulting changes to state
func (a *fundedAddress) processReservations(reservations []*fundRequest, releases []*fundRequest) (pr *processResult, prerr error) {
// When the function returns
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defer func() {
// If there's an error, mark all requests as errored
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if prerr != nil {
for _, req := range append(reservations, releases...) {
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req.Complete(cid.Undef, prerr)
}
return
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}
// Complete all release requests
for _, req := range releases {
req.Complete(cid.Undef, nil)
}
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// Complete all requests that were covered by released amounts
for _, req := range pr.covered {
req.Complete(cid.Undef, nil)
}
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// If a message was sent
if pr.msgCid != nil {
// Complete all add funds requests
for _, req := range pr.added {
req.Complete(*pr.msgCid, nil)
}
}
}()
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// Split reservations into those that are covered by released amounts,
// and those to add to the reserved amount.
// Note that we process requests from the same wallet in batches. So some
// requests may not be included in covered if they don't match the first
// covered request's wallet. These will be processed on a subsequent
// invocation of processReservations.
toCancel, toAdd, reservedDelta := splitReservations(reservations, releases)
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// Apply the reserved delta to the reserved amount
reserved := types.BigAdd(a.state.AmtReserved, reservedDelta)
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if reserved.LessThan(abi.NewTokenAmount(0)) {
reserved = abi.NewTokenAmount(0)
}
res := &processResult{
amtReserved: reserved,
covered: toCancel,
}
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// Work out the amount to add to the balance
amtToAdd := abi.NewTokenAmount(0)
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if len(toAdd) > 0 && reserved.GreaterThan(abi.NewTokenAmount(0)) {
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// Get available funds for address
avail, err := a.env.AvailableFunds(a.ctx, a.state.Addr)
if err != nil {
return res, err
}
// amount to add = new reserved amount - available
amtToAdd = types.BigSub(reserved, avail)
a.debugf("reserved %d - avail %d = to add %d", reserved, avail, amtToAdd)
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}
// If there's nothing to add to the balance, bail out
if amtToAdd.LessThanEqual(abi.NewTokenAmount(0)) {
res.covered = append(res.covered, toAdd...)
return res, nil
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}
// Add funds to address
a.debugf("add funds %d", amtToAdd)
addFundsCid, err := a.env.AddFunds(a.ctx, toAdd[0].Wallet, a.state.Addr, amtToAdd)
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if err != nil {
return res, err
}
// Mark reservation requests as complete
res.added = toAdd
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// Save the message CID to state
res.msgCid = &addFundsCid
return res, nil
}
// Split reservations into those that are under the total release amount
// (covered) and those that exceed it (to add).
// Note that we process requests from the same wallet in batches. So some
// requests may not be included in covered if they don't match the first
// covered request's wallet.
func splitReservations(reservations []*fundRequest, releases []*fundRequest) ([]*fundRequest, []*fundRequest, abi.TokenAmount) {
toCancel := make([]*fundRequest, 0, len(reservations))
toAdd := make([]*fundRequest, 0, len(reservations))
toAddAmt := abi.NewTokenAmount(0)
// Sum release amounts
releaseAmt := abi.NewTokenAmount(0)
for _, req := range releases {
releaseAmt = types.BigAdd(releaseAmt, req.Amount())
}
// We only want to combine requests that come from the same wallet
batchWallet := address.Undef
for _, req := range reservations {
amt := req.Amount()
// If the amount to add to the reserve is cancelled out by a release
if amt.LessThanEqual(releaseAmt) {
// Cancel the request and update the release total
releaseAmt = types.BigSub(releaseAmt, amt)
toCancel = append(toCancel, req)
continue
}
// The amount to add is greater that the release total so we want
// to send an add funds request
// The first time the wallet will be undefined
if batchWallet == address.Undef {
batchWallet = req.Wallet
}
// If this request's wallet is the same as the batch wallet,
// the requests will be combined
if batchWallet == req.Wallet {
delta := types.BigSub(amt, releaseAmt)
toAddAmt = types.BigAdd(toAddAmt, delta)
releaseAmt = abi.NewTokenAmount(0)
toAdd = append(toAdd, req)
}
}
// The change in the reserved amount is "amount to add" - "amount to release"
reservedDelta := types.BigSub(toAddAmt, releaseAmt)
return toCancel, toAdd, reservedDelta
}
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// process withdrawal queue
func (a *fundedAddress) processWithdrawals(withdrawals []*fundRequest) (msgCid cid.Cid, prerr error) {
// If there's an error, mark all withdrawal requests as errored
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defer func() {
if prerr != nil {
for _, req := range withdrawals {
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req.Complete(cid.Undef, prerr)
}
}
}()
// Get the net available balance
avail, err := a.env.AvailableFunds(a.ctx, a.state.Addr)
if err != nil {
return cid.Undef, err
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}
netAvail := types.BigSub(avail, a.state.AmtReserved)
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// Fit as many withdrawals as possible into the available balance, and fail
// the rest
withdrawalAmt := abi.NewTokenAmount(0)
allowedAmt := abi.NewTokenAmount(0)
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allowed := make([]*fundRequest, 0, len(withdrawals))
var batchWallet address.Address
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for _, req := range withdrawals {
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amt := req.Amount()
if amt.IsZero() {
// If the context for the request was cancelled, bail out
req.Complete(cid.Undef, err)
continue
}
// If the amount would exceed the available amount, complete the
// request with an error
newWithdrawalAmt := types.BigAdd(withdrawalAmt, amt)
if newWithdrawalAmt.GreaterThan(netAvail) {
msg := fmt.Sprintf("insufficient funds for withdrawal of %s: ", types.FIL(amt))
msg += fmt.Sprintf("net available (%s) = available (%s) - reserved (%s)",
types.FIL(types.BigSub(netAvail, withdrawalAmt)), types.FIL(avail), types.FIL(a.state.AmtReserved))
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if !withdrawalAmt.IsZero() {
msg += fmt.Sprintf(" - queued withdrawals (%s)", types.FIL(withdrawalAmt))
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}
err := xerrors.Errorf(msg)
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a.debugf("%s", err)
req.Complete(cid.Undef, err)
continue
}
// If this is the first allowed withdrawal request in this batch, save
// its wallet address
if batchWallet == address.Undef {
batchWallet = req.Wallet
}
// If the request wallet doesn't match the batch wallet, bail out
// (the withdrawal will be processed after the current batch has
// completed)
if req.Wallet != batchWallet {
continue
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}
// Include this withdrawal request in the batch
withdrawalAmt = newWithdrawalAmt
a.debugf("withdraw %d", amt)
allowed = append(allowed, req)
allowedAmt = types.BigAdd(allowedAmt, amt)
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}
// Check if there is anything to withdraw.
// Note that if the context for a request is cancelled,
// req.Amount() returns zero
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if allowedAmt.Equals(abi.NewTokenAmount(0)) {
// Mark allowed requests as complete
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for _, req := range allowed {
req.Complete(cid.Undef, nil)
}
return cid.Undef, nil
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}
// Withdraw funds
a.debugf("withdraw funds %d", allowedAmt)
withdrawFundsCid, err := a.env.WithdrawFunds(a.ctx, allowed[0].Wallet, a.state.Addr, allowedAmt)
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if err != nil {
return cid.Undef, err
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}
// Mark allowed requests as complete
for _, req := range allowed {
req.Complete(withdrawFundsCid, nil)
}
// Save the message CID to state
return withdrawFundsCid, nil
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}
// asynchonously wait for results of message
func (a *fundedAddress) startWaitForResults(msgCid cid.Cid) {
go func() {
err := a.env.WaitMsg(a.ctx, msgCid)
if err != nil {
// We don't really care about the results here, we're just waiting
// so as to only process one on-chain message at a time
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log.Errorf("waiting for results of message %s for addr %s: %v", msgCid, a.state.Addr, err)
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}
a.lk.Lock()
a.debugf("complete wait")
a.clearWaitState()
a.lk.Unlock()
a.process()
}()
}
func (a *fundedAddress) debugf(args ...interface{}) {
fmtStr := args[0].(string)
args = args[1:]
log.Debugf(a.state.Addr.String()+": "+fmtStr, args...)
}
// The result of a fund request
type reqResult struct {
msgCid cid.Cid
err error
}
// A request to change funds
type fundRequest struct {
ctx context.Context
amt abi.TokenAmount
completed chan struct{}
Wallet address.Address
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Result chan reqResult
}
func newFundRequest(ctx context.Context, wallet address.Address, amt abi.TokenAmount) *fundRequest {
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return &fundRequest{
ctx: ctx,
amt: amt,
Wallet: wallet,
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Result: make(chan reqResult),
completed: make(chan struct{}),
}
}
// Amount returns zero if the context has expired
func (frp *fundRequest) Amount() abi.TokenAmount {
if frp.ctx.Err() != nil {
return abi.NewTokenAmount(0)
}
return frp.amt
}
// Complete is called with the message CID when the funds request has been
// started or with the error if there was an error
func (frp *fundRequest) Complete(msgCid cid.Cid, err error) {
select {
case <-frp.completed:
case <-frp.ctx.Done():
case frp.Result <- reqResult{msgCid: msgCid, err: err}:
}
close(frp.completed)
}
// Completed indicates if Complete has already been called
func (frp *fundRequest) Completed() bool {
select {
case <-frp.completed:
return true
default:
return false
}
}
// fundManagerEnvironment simplifies some API calls
type fundManagerEnvironment struct {
api fundManagerAPI
}
func (env *fundManagerEnvironment) AvailableFunds(ctx context.Context, addr address.Address) (abi.TokenAmount, error) {
bal, err := env.api.StateMarketBalance(ctx, addr, types.EmptyTSK)
if err != nil {
return abi.NewTokenAmount(0), err
}
return types.BigSub(bal.Escrow, bal.Locked), nil
}
func (env *fundManagerEnvironment) AddFunds(
ctx context.Context,
wallet address.Address,
addr address.Address,
amt abi.TokenAmount,
) (cid.Cid, error) {
params, err := actors.SerializeParams(&addr)
if err != nil {
return cid.Undef, err
}
smsg, aerr := env.api.MpoolPushMessage(ctx, &types.Message{
To: market.Address,
From: wallet,
Value: amt,
Method: market.Methods.AddBalance,
Params: params,
}, nil)
if aerr != nil {
return cid.Undef, aerr
}
return smsg.Cid(), nil
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}
func (env *fundManagerEnvironment) WithdrawFunds(
ctx context.Context,
wallet address.Address,
addr address.Address,
amt abi.TokenAmount,
) (cid.Cid, error) {
params, err := actors.SerializeParams(&market.WithdrawBalanceParams{
ProviderOrClientAddress: addr,
Amount: amt,
})
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if err != nil {
return cid.Undef, xerrors.Errorf("serializing params: %w", err)
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}
smsg, aerr := env.api.MpoolPushMessage(ctx, &types.Message{
To: market.Address,
From: wallet,
Value: types.NewInt(0),
Method: market.Methods.WithdrawBalance,
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Params: params,
}, nil)
if aerr != nil {
return cid.Undef, aerr
}
return smsg.Cid(), nil
}
func (env *fundManagerEnvironment) WaitMsg(ctx context.Context, c cid.Cid) error {
_, err := env.api.StateWaitMsg(ctx, c, build.MessageConfidence)
return err
}