nim-dagger/dagger/blockexchange/engine/payments.nim

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import std/math
import pkg/nitro
import pkg/questionable/results
import ../peercontext
export nitro
export results
export peercontext
push: {.upraises: [].}
const ChainId* = 0.u256 # invalid chain id for now
const Asset* = EthAddress.zero # invalid ERC20 asset address for now
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const AmountPerChannel = (10'u64^18).u256 # 1 asset, ERC20 default is 18 decimals
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func openLedgerChannel*(wallet: WalletRef,
hub: EthAddress,
asset: EthAddress): ?!ChannelId =
wallet.openLedgerChannel(hub, ChainId, asset, AmountPerChannel)
func getOrOpenChannel(wallet: WalletRef, peer: BlockExcPeerCtx): ?!ChannelId =
if channel =? peer.paymentChannel:
success channel
elif account =? peer.account:
let channel = ?wallet.openLedgerChannel(account.address, Asset)
peer.paymentChannel = channel.some
success channel
else:
failure "no account set for peer"
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func pay*(wallet: WalletRef,
peer: BlockExcPeerCtx,
amount: UInt256): ?!SignedState =
if account =? peer.account:
let asset = Asset
let receiver = account.address
let channel = ?wallet.getOrOpenChannel(peer)
wallet.pay(channel, asset, receiver, amount)
else:
failure "no account set for peer"