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open.go
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open.go
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package vat
import (
"github.com/fox-one/pando/core"
"github.com/fox-one/pando/pkg/maker"
"github.com/fox-one/pando/pkg/maker/cat"
"github.com/fox-one/pando/pkg/uuid"
"github.com/fox-one/pkg/logger"
"github.com/shopspring/decimal"
)
func HandleOpen(
collaterals core.CollateralStore,
vaults core.VaultStore,
wallets core.WalletStore,
) maker.HandlerFunc {
return func(r *maker.Request) error {
ctx := r.Context()
if err := require(r.Sender != "", "anonymous"); err != nil {
return err
}
c, err := cat.From(r, collaterals)
if err != nil {
return err
}
if err := require(c.Live > 0, "not-live"); err != nil {
return maker.WithFlag(err, maker.FlagRefund)
}
if err := require(r.AssetID == c.Gem, "gem-not-match"); err != nil {
return err
}
event, err := vaults.FindEvent(ctx, r.TraceID, r.Version)
if err != nil {
logger.FromContext(ctx).WithError(err).Errorln("vaults.FindEvent")
return err
}
if event.ID == 0 {
var debt decimal.Decimal
if err := require(r.Scan(&debt) == nil, "bad-data"); err != nil {
return err
}
debt = debt.Truncate(8)
if err := require(debt.IsPositive(), "bad-data"); err != nil {
return err
}
dink := r.Amount
dart := debt.Div(c.Rate)
v := &core.Vault{
CreatedAt: r.Now,
TraceID: r.TraceID,
Version: r.Version,
UserID: r.Sender,
CollateralID: c.TraceID,
}
if err := frob(r, c, v, dink, dart); err != nil {
return maker.WithFlag(err, maker.FlagRefund)
}
// handle transfer
{
var transfers []*core.Transfer
// 放款
memo := core.TransferAction{
ID: r.FollowID,
Source: r.Action.String(),
}.Encode()
transfers = append(transfers, &core.Transfer{
TraceID: uuid.Modify(r.TraceID, memo),
AssetID: c.Dai,
Amount: debt,
Memo: memo,
Threshold: 1,
Opponents: []string{r.Sender},
})
if err := wallets.CreateTransfers(ctx, transfers); err != nil {
logger.FromContext(ctx).WithError(err).Errorln("wallets.CreateTransfers")
return err
}
}
// create vault
{
v.Ink, v.Art = dink, dart
if err := vaults.Create(ctx, v); err != nil {
logger.FromContext(ctx).WithError(err).Errorln("vaults.Create")
return err
}
}
// create vault event
{
event = &core.VaultEvent{
CreatedAt: r.Now,
VaultID: v.TraceID,
Version: r.Version,
Action: r.Action,
Dink: dink,
Dart: dart,
Debt: debt,
}
if err := vaults.CreateEvent(ctx, event); err != nil {
logger.FromContext(ctx).WithError(err).Errorln("vaults.CreateEvent")
return err
}
}
}
if c.Version < r.Version {
c.Art = c.Art.Add(event.Dart)
c.Debt = c.Debt.Add(event.Debt)
c.Ink = c.Ink.Add(event.Dink)
if err := collaterals.Update(ctx, c, r.Version); err != nil {
logger.FromContext(ctx).WithError(err).Errorln("collaterals.Update")
return err
}
}
return nil
}
}