lotus/paych/simple.go
2019-12-01 22:52:24 +01:00

121 lines
3.1 KiB
Go

package paych
import (
"context"
"fmt"
"github.com/ipfs/go-cid"
"golang.org/x/xerrors"
"github.com/filecoin-project/lotus/chain/actors"
"github.com/filecoin-project/lotus/chain/address"
"github.com/filecoin-project/lotus/chain/types"
)
func (pm *Manager) createPaych(ctx context.Context, from, to address.Address, amt types.BigInt) (address.Address, cid.Cid, error) {
params, aerr := actors.SerializeParams(&actors.PCAConstructorParams{To: to})
if aerr != nil {
return address.Undef, cid.Undef, aerr
}
enc, aerr := actors.SerializeParams(&actors.ExecParams{
Params: params,
Code: actors.PaymentChannelCodeCid,
})
if aerr != nil {
return address.Undef, cid.Undef, aerr
}
msg := &types.Message{
To: actors.InitAddress,
From: from,
Value: amt,
Method: actors.IAMethods.Exec,
Params: enc,
GasLimit: types.NewInt(1000000),
GasPrice: types.NewInt(0),
}
smsg, err := pm.mpool.MpoolPushMessage(ctx, msg)
if err != nil {
return address.Undef, cid.Undef, xerrors.Errorf("initializing paych actor: %w", err)
}
mcid := smsg.Cid()
// TODO: wait outside the store lock!
// (tricky because we need to setup channel tracking before we know it's address)
mwait, err := pm.state.StateWaitMsg(ctx, mcid)
if err != nil {
return address.Undef, cid.Undef, xerrors.Errorf("wait msg: %w", err)
}
if mwait.Receipt.ExitCode != 0 {
return address.Undef, cid.Undef, fmt.Errorf("payment channel creation failed (exit code %d)", mwait.Receipt.ExitCode)
}
paychaddr, err := address.NewFromBytes(mwait.Receipt.Return)
if err != nil {
return address.Undef, cid.Undef, err
}
ci, err := pm.loadOutboundChannelInfo(ctx, paychaddr)
if err != nil {
return address.Undef, cid.Undef, xerrors.Errorf("loading channel info: %w", err)
}
if err := pm.store.trackChannel(ci); err != nil {
return address.Undef, cid.Undef, xerrors.Errorf("tracking channel: %w", err)
}
return paychaddr, mcid, nil
}
func (pm *Manager) addFunds(ctx context.Context, ch address.Address, from address.Address, amt types.BigInt) error {
msg := &types.Message{
To: ch,
From: from,
Value: amt,
Method: 0,
GasLimit: types.NewInt(1000000),
GasPrice: types.NewInt(0),
}
smsg, err := pm.mpool.MpoolPushMessage(ctx, msg)
if err != nil {
return err
}
mwait, err := pm.state.StateWaitMsg(ctx, smsg.Cid()) // TODO: wait outside the store lock!
if err != nil {
return err
}
if mwait.Receipt.ExitCode != 0 {
return fmt.Errorf("voucher channel creation failed: adding funds (exit code %d)", mwait.Receipt.ExitCode)
}
return nil
}
func (pm *Manager) GetPaych(ctx context.Context, from, to address.Address, ensureFree types.BigInt) (address.Address, cid.Cid, error) {
pm.store.lk.Lock()
defer pm.store.lk.Unlock()
ch, err := pm.store.findChan(func(ci *ChannelInfo) bool {
if ci.Direction != DirOutbound {
return false
}
return ci.Control == from && ci.Target == to
})
if err != nil {
return address.Undef, cid.Undef, xerrors.Errorf("findChan: %w", err)
}
if ch != address.Undef {
// TODO: Track available funds
return ch, cid.Undef, pm.addFunds(ctx, ch, from, ensureFree)
}
return pm.createPaych(ctx, from, to, ensureFree)
}