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package coordinator
import (
"time"
ethCommon "github.com/ethereum/go-ethereum/common"
"github.com/hermeznetwork/hermez-node/batchbuilder"
"github.com/hermeznetwork/hermez-node/common"
"github.com/hermeznetwork/hermez-node/eth"
"github.com/hermeznetwork/hermez-node/txselector"
kvdb "github.com/iden3/go-merkletree/db"
"github.com/iden3/go-merkletree/db/memory"
)
// CoordinatorConfig contains the Coordinator configuration
type CoordinatorConfig struct {
ForgerAddress ethCommon.Address
}
// Coordinator implements the Coordinator type
type Coordinator struct {
config CoordinatorConfig
batchNum uint64
batchQueue *BatchQueue
serverProofPool ServerProofPool
// synchronizer *synchronizer.Synchronizer
txsel *txselector.TxSelector
batchBuilder *batchbuilder.BatchBuilder
ethClient *eth.Client
ethTxStore kvdb.Storage
}
// NewCoordinator creates a new Coordinator
func NewCoordinator() *Coordinator { // once synchronizer is ready, synchronizer.Synchronizer will be passed as parameter here
var c *Coordinator
// c.ethClient = eth.NewClient() // TBD
c.ethTxStore = memory.NewMemoryStorage()
return c
}
// Start starts the Coordinator service
func (c *Coordinator) Start() {
// TODO TBD note: the sequences & loops & errors & logging & goroutines
// & channels approach still needs to be defined, the current code is a
// wip draft
// TBD: goroutines strategy
// if in Forge Sequence:
if c.isForgeSequence() {
// c.batchNum = c.synchronizer.LastBatchNum()
_ = c.txsel.Reset(c.batchNum)
_ = c.batchBuilder.Reset(c.batchNum, true)
c.batchQueue = NewBatchQueue()
go func() {
for {
_ = c.forgeSequence()
time.Sleep(1 * time.Second)
}
}()
go func() {
for {
_ = c.proveSequence()
time.Sleep(1 * time.Second)
}
}()
go func() {
for {
_ = c.forgeConfirmationSequence()
time.Sleep(1 * time.Second)
}
}()
}
}
func (c *Coordinator) forgeSequence() error {
// TODO once synchronizer has this method ready:
// If there's been a reorg, handle it
// handleReorg() function decides if the reorg must restart the pipeline or not
// if c.synchronizer.Reorg():
_ = c.handleReorg()
// 0. If there's an available server proof: Start pipeline for batchNum = batchNum + 1
serverProofInfo, err := c.serverProofPool.GetNextAvailable() // blocking call, returns when a server proof is available
if err != nil {
return err
}
// remove transactions from the pool that have been there for too long
err = c.purgeRemoveByTimeout()
if err != nil {
return err
}
c.batchNum = c.batchNum + 1
batchInfo := NewBatchInfo(c.batchNum, serverProofInfo) // to accumulate metadata of the batch
var poolL2Txs []*common.PoolL2Tx
// var feesInfo
var l1UserTxsExtra, l1OperatorTxs []*common.L1Tx
// 1. Decide if we forge L2Tx or L1+L2Tx
if c.shouldL1L2Batch() {
// 2a: L1+L2 txs
// l1UserTxs, toForgeL1TxsNumber := c.synchronizer.GetNextL1UserTxs() // TODO once synchronizer is ready, uncomment
var l1UserTxs []*common.L1Tx = nil // tmp, depends on synchronizer
l1UserTxsExtra, l1OperatorTxs, poolL2Txs, err = c.txsel.GetL1L2TxSelection(c.batchNum, l1UserTxs) // TODO once feesInfo is added to method return, add the var
if err != nil {
return err
}
} else {
// 2b: only L2 txs
poolL2Txs, err = c.txsel.GetL2TxSelection(c.batchNum) // TODO once feesInfo is added to method return, add the var
if err != nil {
return err
}
l1UserTxsExtra = nil
l1OperatorTxs = nil
}
// Run purger to invalidate transactions that become invalid beause of
// the poolL2Txs selected. Will mark as invalid the txs that have a
// (fromIdx, nonce) which already appears in the selected txs (includes
// all the nonces smaller than the current one)
err = c.purgeInvalidDueToL2TxsSelection(poolL2Txs)
if err != nil {
return err
}
// 3. Save metadata from TxSelector output for BatchNum
batchInfo.SetTxsInfo(l1UserTxsExtra, l1OperatorTxs, poolL2Txs) // TODO feesInfo
// 4. Call BatchBuilder with TxSelector output
configBatch := &batchbuilder.ConfigBatch{
ForgerAddress: c.config.ForgerAddress,
}
l2Txs := common.PoolL2TxsToL2Txs(poolL2Txs)
zkInputs, err := c.batchBuilder.BuildBatch(configBatch, l1UserTxsExtra, l1OperatorTxs, l2Txs, nil) // TODO []common.TokenID --> feesInfo
if err != nil {
return err
}
// 5. Save metadata from BatchBuilder output for BatchNum
batchInfo.SetZKInputs(zkInputs)
// 6. Call an idle server proof with BatchBuilder output, save server proof info for batchNum
err = batchInfo.serverProof.CalculateProof(zkInputs)
if err != nil {
return err
}
c.batchQueue.Push(&batchInfo)
return nil
}
// proveSequence gets the generated zkProof & sends it to the SmartContract
func (c *Coordinator) proveSequence() error {
batchInfo := c.batchQueue.Pop()
if batchInfo == nil {
// no batches in queue, return
return common.ErrBatchQueueEmpty
}
serverProofInfo := batchInfo.serverProof
proof, err := serverProofInfo.GetProof() // blocking call, until not resolved don't continue. Returns when the proof server has calculated the proof
if err != nil {
return err
}
batchInfo.SetProof(proof)
callData := c.prepareCallDataForge(batchInfo)
_, err = c.ethClient.ForgeCall(callData)
if err != nil {
return err
}
// TODO once tx data type is defined, store ethTx (returned by ForgeCall)
// TBD if use ethTxStore as a disk k-v database, or use a Queue
// tx, err := c.ethTxStore.NewTx()
// if err != nil {
// return err
// }
// tx.Put(ethTx.Hash(), ethTx.Bytes())
// if err := tx.Commit(); err!=nil {
// return nil
// }
return nil
}
func (c *Coordinator) forgeConfirmationSequence() error {
// TODO strategy of this sequence TBD
// confirm eth txs and mark them as accepted sequence
// ethTx := ethTxStore.GetFirstPending()
// waitForAccepted(ethTx) // blocking call, returns once the ethTx is mined
// ethTxStore.MarkAccepted(ethTx)
return nil
}
func (c *Coordinator) handleReorg() error {
return nil
}
// isForgeSequence returns true if the node is the Forger in the current ethereum block
func (c *Coordinator) isForgeSequence() bool {
return false
}
func (c *Coordinator) purgeRemoveByTimeout() error {
return nil
}
func (c *Coordinator) purgeInvalidDueToL2TxsSelection(l2Txs []*common.PoolL2Tx) error {
return nil
}
func (c *Coordinator) shouldL1L2Batch() bool {
return false
}
func (c *Coordinator) prepareCallDataForge(batchInfo *BatchInfo) *common.CallDataForge {
return nil
}