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assigner.go
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assigner.go
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package assigner
import (
"context"
"errors"
"fmt"
"time"
"github.com/fox-one/mixin-sdk-go"
"github.com/fox-one/pando/core"
"github.com/fox-one/pando/pkg/uuid"
"github.com/fox-one/pkg/logger"
"github.com/shopspring/decimal"
)
var (
errOutputMergeRequired = errors.New("output merge required")
)
func New(
wallets core.WalletStore,
system *core.System,
) *Assigner {
return &Assigner{
wallets: wallets,
system: system,
}
}
type Assigner struct {
wallets core.WalletStore
system *core.System
}
func (w *Assigner) Run(ctx context.Context) error {
log := logger.FromContext(ctx).WithField("worker", "assigner")
ctx = logger.WithContext(ctx, log)
dur := time.Millisecond
for {
select {
case <-ctx.Done():
return ctx.Err()
case <-time.After(dur):
if err := w.run(ctx); err == nil {
dur = 300 * time.Millisecond
} else {
dur = 500 * time.Millisecond
}
}
}
}
func (w *Assigner) run(ctx context.Context) error {
const limit = 100
transfers, err := w.wallets.ListTransfers(ctx, core.TransferStatusPending, limit)
if err != nil {
logger.FromContext(ctx).WithError(err).Errorln("wallets.ListTransfers")
return err
}
aborted := map[string]bool{}
for _, transfer := range transfers {
if aborted[transfer.AssetID] {
continue
}
if err := w.handleTransfer(ctx, transfer); err != nil {
aborted[transfer.AssetID] = true
}
}
if len(aborted) > 0 {
return errors.New("aborted")
}
return nil
}
func (w *Assigner) handleTransfer(ctx context.Context, transfer *core.Transfer) error {
log := logger.FromContext(ctx).WithField("transfer", transfer.TraceID)
const limit = 32
outputs, err := w.wallets.ListUnspent(ctx, transfer.AssetID, limit)
if err != nil {
log.WithError(err).Errorln("wallets.ListUnspent")
return err
}
var (
idx int
sum decimal.Decimal
traces []string
)
// spent all utxo if all utxo is older than the transfer
wipe := len(outputs) == limit && outputs[limit-1].ID <= transfer.Version
for _, output := range outputs {
sum = sum.Add(output.Amount)
traces = append(traces, output.TraceID)
idx += 1
if wipe {
continue
}
if sum.GreaterThanOrEqual(transfer.Amount) {
break
}
}
outputs = outputs[:idx]
if sum.LessThan(transfer.Amount) {
// merge outputs
if len(outputs) == limit {
traceID := uuid.Modify(transfer.TraceID, mixin.HashMembers(traces))
merge := &core.Transfer{
TraceID: traceID,
Version: transfer.Version,
AssetID: transfer.AssetID,
Amount: sum,
Opponents: w.system.Members,
Threshold: w.system.Threshold,
Memo: fmt.Sprintf("merge for %s", transfer.TraceID),
}
if err := w.commit(ctx, outputs, merge); err != nil {
return err
}
return errOutputMergeRequired
}
err := errors.New("insufficient balance")
log.WithError(err).Errorln("handle transfer", transfer.ID)
return err
}
return w.commit(ctx, outputs, transfer)
}
func (w *Assigner) commit(ctx context.Context, outputs []*core.Output, transfer *core.Transfer) error {
if err := w.wallets.Assign(ctx, outputs, transfer); err != nil {
logger.FromContext(ctx).WithError(err).Errorln("wallets.Assign")
return err
}
return nil
}