// ProposeChannel is called to propose a new channel. It creates and signs an
// OpeningTx, sends it to the Counterparty and saves it in a new Channel.
func (a *CallerAPI) ProposeChannel(
channelId string,
state []byte,
myPubkey []byte,
theirPubkey []byte,
holdPeriod uint64,
) (*core.Channel, error) {
ch := &core.Channel{}
err := a.DB.Update(func(tx *bolt.Tx) error {
acct, err := access.GetAccount(tx, myPubkey)
if err != nil {
return err
}
cpt, err := access.GetCounterparty(tx, theirPubkey)
if err != nil {
return err
}
otx, err := acct.NewOpeningTx(channelId, cpt, state, holdPeriod)
if err != nil {
return err
}
ev, err := core.SerializeOpeningTx(otx)
if err != nil {
return err
}
acct.AppendSignature(ev)
ch, err = core.NewChannel(ev, otx, acct, cpt)
if err != nil {
return err
}
err = a.CounterpartyClient.AddChannel(ev, cpt.Address)
if err != nil {
return err
}
err = access.SetChannel(tx, ch)
if err != nil {
return err
}
return nil
})
if err != nil {
return nil, err
}
return ch, nil
}
func (a *CounterpartyAPI) AddChannel(ev *wire.Envelope) error {
var err error
otx := &wire.OpeningTx{}
err = proto.Unmarshal(ev.Payload, otx)
if err != nil {
return err
}
acct := &core.Account{}
cpt := &core.Counterparty{}
err = a.DB.Update(func(tx *bolt.Tx) error {
_, nilErr := access.GetChannel(tx, otx.ChannelId)
if nilErr == nil {
return errors.New("channel already exists")
}
_, ok := nilErr.(*access.NilError)
if !ok {
return err
}
cpt, err = access.GetCounterparty(tx, otx.Pubkeys[0])
if err != nil {
return err
}
acct, err = access.GetAccount(tx, otx.Pubkeys[1])
if err != nil {
return err
}
err = acct.CheckOpeningTx(ev, cpt)
if err != nil {
return err
}
ch, err := core.NewChannel(ev, otx, acct, cpt)
if err != nil {
return err
}
access.SetChannel(tx, ch)
if err != nil {
return err
}
return nil
})
if err != nil {
return err
}
return nil
}