291 lines
9.8 KiB
Go
291 lines
9.8 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package swap
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import (
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"context"
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"crypto/ecdsa"
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"fmt"
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"math/big"
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"os"
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"path/filepath"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/accounts/abi/bind"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/contracts/chequebook"
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"github.com/ethereum/go-ethereum/contracts/chequebook/contract"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/swarm/services/swap/swap"
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)
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// SwAP Swarm Accounting Protocol with
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// SWAP^2 Strategies of Withholding Automatic Payments
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// SWAP^3 Accreditation: payment via credit SWAP
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// using chequebook pkg for delayed payments
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// default parameters
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var (
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autoCashInterval = 300 * time.Second // default interval for autocash
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autoCashThreshold = big.NewInt(50000000000000) // threshold that triggers autocash (wei)
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autoDepositInterval = 300 * time.Second // default interval for autocash
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autoDepositThreshold = big.NewInt(50000000000000) // threshold that triggers autodeposit (wei)
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autoDepositBuffer = big.NewInt(100000000000000) // buffer that is surplus for fork protection etc (wei)
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buyAt = big.NewInt(20000000000) // maximum chunk price host is willing to pay (wei)
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sellAt = big.NewInt(20000000000) // minimum chunk price host requires (wei)
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payAt = 100 // threshold that triggers payment {request} (units)
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dropAt = 10000 // threshold that triggers disconnect (units)
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)
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const (
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chequebookDeployRetries = 5
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chequebookDeployDelay = 1 * time.Second // delay between retries
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)
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type SwapParams struct {
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*swap.Params
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*PayProfile
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}
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type SwapProfile struct {
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*swap.Profile
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*PayProfile
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}
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type PayProfile struct {
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PublicKey string // check against signature of promise
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Contract common.Address // address of chequebook contract
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Beneficiary common.Address // recipient address for swarm sales revenue
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privateKey *ecdsa.PrivateKey
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publicKey *ecdsa.PublicKey
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owner common.Address
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chbook *chequebook.Chequebook
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lock sync.RWMutex
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}
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//create params with default values
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func NewDefaultSwapParams() *SwapParams {
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return &SwapParams{
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PayProfile: &PayProfile{},
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Params: &swap.Params{
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Profile: &swap.Profile{
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BuyAt: buyAt,
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SellAt: sellAt,
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PayAt: uint(payAt),
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DropAt: uint(dropAt),
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},
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Strategy: &swap.Strategy{
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AutoCashInterval: autoCashInterval,
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AutoCashThreshold: autoCashThreshold,
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AutoDepositInterval: autoDepositInterval,
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AutoDepositThreshold: autoDepositThreshold,
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AutoDepositBuffer: autoDepositBuffer,
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},
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},
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}
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}
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//this can only finally be set after all config options (file, cmd line, env vars)
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//have been evaluated
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func (self *SwapParams) Init(contract common.Address, prvkey *ecdsa.PrivateKey) {
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pubkey := &prvkey.PublicKey
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self.PayProfile = &PayProfile{
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PublicKey: common.ToHex(crypto.FromECDSAPub(pubkey)),
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Contract: contract,
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Beneficiary: crypto.PubkeyToAddress(*pubkey),
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privateKey: prvkey,
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publicKey: pubkey,
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owner: crypto.PubkeyToAddress(*pubkey),
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}
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}
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// swap constructor, parameters
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// * global chequebook, assume deployed service and
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// * the balance is at buffer.
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// swap.Add(n) called in netstore
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// n > 0 called when sending chunks = receiving retrieve requests
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// OR sending cheques.
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// n < 0 called when receiving chunks = receiving delivery responses
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// OR receiving cheques.
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func NewSwap(local *SwapParams, remote *SwapProfile, backend chequebook.Backend, proto swap.Protocol) (self *swap.Swap, err error) {
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var (
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ctx = context.TODO()
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ok bool
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in *chequebook.Inbox
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out *chequebook.Outbox
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)
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// check if remote chequebook is valid
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// insolvent chequebooks suicide so will signal as invalid
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// TODO: monitoring a chequebooks events
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ok, err = chequebook.ValidateCode(ctx, backend, remote.Contract)
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if !ok {
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log.Info(fmt.Sprintf("invalid contract %v for peer %v: %v)", remote.Contract.Hex()[:8], proto, err))
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} else {
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// remote contract valid, create inbox
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in, err = chequebook.NewInbox(local.privateKey, remote.Contract, local.Beneficiary, crypto.ToECDSAPub(common.FromHex(remote.PublicKey)), backend)
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if err != nil {
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log.Warn(fmt.Sprintf("unable to set up inbox for chequebook contract %v for peer %v: %v)", remote.Contract.Hex()[:8], proto, err))
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}
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}
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// check if local chequebook contract is valid
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ok, err = chequebook.ValidateCode(ctx, backend, local.Contract)
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if !ok {
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log.Warn(fmt.Sprintf("unable to set up outbox for peer %v: chequebook contract (owner: %v): %v)", proto, local.owner.Hex(), err))
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} else {
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out = chequebook.NewOutbox(local.Chequebook(), remote.Beneficiary)
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}
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pm := swap.Payment{
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In: in,
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Out: out,
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Buys: out != nil,
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Sells: in != nil,
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}
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self, err = swap.New(local.Params, pm, proto)
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if err != nil {
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return
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}
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// remote profile given (first) in handshake
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self.SetRemote(remote.Profile)
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var buy, sell string
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if self.Buys {
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buy = "purchase from peer enabled at " + remote.SellAt.String() + " wei/chunk"
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} else {
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buy = "purchase from peer disabled"
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}
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if self.Sells {
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sell = "selling to peer enabled at " + local.SellAt.String() + " wei/chunk"
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} else {
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sell = "selling to peer disabled"
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}
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log.Warn(fmt.Sprintf("SWAP arrangement with <%v>: %v; %v)", proto, buy, sell))
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return
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}
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func (self *SwapParams) Chequebook() *chequebook.Chequebook {
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defer self.lock.Unlock()
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self.lock.Lock()
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return self.chbook
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}
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func (self *SwapParams) PrivateKey() *ecdsa.PrivateKey {
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return self.privateKey
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}
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// func (self *SwapParams) PublicKey() *ecdsa.PublicKey {
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// return self.publicKey
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// }
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func (self *SwapParams) SetKey(prvkey *ecdsa.PrivateKey) {
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self.privateKey = prvkey
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self.publicKey = &prvkey.PublicKey
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}
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// setChequebook(path, backend) wraps the
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// chequebook initialiser and sets up autoDeposit to cover spending.
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func (self *SwapParams) SetChequebook(ctx context.Context, backend chequebook.Backend, path string) error {
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self.lock.Lock()
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contract := self.Contract
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self.lock.Unlock()
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valid, err := chequebook.ValidateCode(ctx, backend, contract)
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if err != nil {
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return err
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} else if valid {
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return self.newChequebookFromContract(path, backend)
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}
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return self.deployChequebook(ctx, backend, path)
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}
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func (self *SwapParams) deployChequebook(ctx context.Context, backend chequebook.Backend, path string) error {
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opts := bind.NewKeyedTransactor(self.privateKey)
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opts.Value = self.AutoDepositBuffer
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opts.Context = ctx
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log.Info(fmt.Sprintf("Deploying new chequebook (owner: %v)", opts.From.Hex()))
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contract, err := deployChequebookLoop(opts, backend)
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if err != nil {
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log.Error(fmt.Sprintf("unable to deploy new chequebook: %v", err))
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return err
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}
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log.Info(fmt.Sprintf("new chequebook deployed at %v (owner: %v)", contract.Hex(), opts.From.Hex()))
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// need to save config at this point
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self.lock.Lock()
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self.Contract = contract
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err = self.newChequebookFromContract(path, backend)
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self.lock.Unlock()
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if err != nil {
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log.Warn(fmt.Sprintf("error initialising cheque book (owner: %v): %v", opts.From.Hex(), err))
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}
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return err
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}
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// repeatedly tries to deploy a chequebook.
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func deployChequebookLoop(opts *bind.TransactOpts, backend chequebook.Backend) (addr common.Address, err error) {
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var tx *types.Transaction
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for try := 0; try < chequebookDeployRetries; try++ {
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if try > 0 {
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time.Sleep(chequebookDeployDelay)
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}
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if _, tx, _, err = contract.DeployChequebook(opts, backend); err != nil {
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log.Warn(fmt.Sprintf("can't send chequebook deploy tx (try %d): %v", try, err))
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continue
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}
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if addr, err = bind.WaitDeployed(opts.Context, backend, tx); err != nil {
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log.Warn(fmt.Sprintf("chequebook deploy error (try %d): %v", try, err))
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continue
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}
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return addr, nil
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}
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return addr, err
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}
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// initialise the chequebook from a persisted json file or create a new one
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// caller holds the lock
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func (self *SwapParams) newChequebookFromContract(path string, backend chequebook.Backend) error {
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hexkey := common.Bytes2Hex(self.Contract.Bytes())
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err := os.MkdirAll(filepath.Join(path, "chequebooks"), os.ModePerm)
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if err != nil {
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return fmt.Errorf("unable to create directory for chequebooks: %v", err)
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}
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chbookpath := filepath.Join(path, "chequebooks", hexkey+".json")
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self.chbook, err = chequebook.LoadChequebook(chbookpath, self.privateKey, backend, true)
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if err != nil {
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self.chbook, err = chequebook.NewChequebook(chbookpath, self.Contract, self.privateKey, backend)
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if err != nil {
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log.Warn(fmt.Sprintf("unable to initialise chequebook (owner: %v): %v", self.owner.Hex(), err))
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return fmt.Errorf("unable to initialise chequebook (owner: %v): %v", self.owner.Hex(), err)
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}
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}
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self.chbook.AutoDeposit(self.AutoDepositInterval, self.AutoDepositThreshold, self.AutoDepositBuffer)
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log.Info(fmt.Sprintf("auto deposit ON for %v -> %v: interval = %v, threshold = %v, buffer = %v)", crypto.PubkeyToAddress(*(self.publicKey)).Hex()[:8], self.Contract.Hex()[:8], self.AutoDepositInterval, self.AutoDepositThreshold, self.AutoDepositBuffer))
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return nil
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}
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