func makedag(ctx *cli.Context) {
utils.CheckLegalese(ctx.GlobalString(utils.DataDirFlag.Name))
args := ctx.Args()
wrongArgs := func() {
utils.Fatalf(`Usage: geth makedag <block number> <outputdir>`)
}
switch {
case len(args) == 2:
blockNum, err := strconv.ParseUint(args[0], 0, 64)
dir := args[1]
if err != nil {
wrongArgs()
} else {
dir = filepath.Clean(dir)
// seems to require a trailing slash
if !strings.HasSuffix(dir, "/") {
dir = dir + "/"
}
_, err = ioutil.ReadDir(dir)
if err != nil {
utils.Fatalf("Can't find dir")
}
fmt.Println("making DAG, this could take awhile...")
ethash.MakeDAG(blockNum, dir)
}
default:
wrongArgs()
}
}
func (self *minerApi) MakeDAG(req *shared.Request) (interface{}, error) {
args := new(MakeDAGArgs)
if err := self.codec.Decode(req.Params, &args); err != nil {
return nil, err
}
if args.BlockNumber < 0 {
return false, shared.NewValidationError("BlockNumber", "BlockNumber must be positive")
}
err := ethash.MakeDAG(uint64(args.BlockNumber), "")
if err == nil {
return true, nil
}
return false, err
}
// StartAutoDAG() spawns a go routine that checks the DAG every autoDAGcheckInterval
// by default that is 10 times per epoch
// in epoch n, if we past autoDAGepochHeight within-epoch blocks,
// it calls ethash.MakeDAG to pregenerate the DAG for the next epoch n+1
// if it does not exist yet as well as remove the DAG for epoch n-1
// the loop quits if autodagquit channel is closed, it can safely restart and
// stop any number of times.
// For any more sophisticated pattern of DAG generation, use CLI subcommand
// makedag
func (self *Ethereum) StartAutoDAG() {
if self.autodagquit != nil {
return // already started
}
go func() {
glog.V(logger.Info).Infof("Automatic pregeneration of ethash DAG ON (ethash dir: %s)", ethash.DefaultDir)
var nextEpoch uint64
timer := time.After(0)
self.autodagquit = make(chan bool)
for {
select {
case <-timer:
glog.V(logger.Info).Infof("checking DAG (ethash dir: %s)", ethash.DefaultDir)
currentBlock := self.ChainManager().CurrentBlock().NumberU64()
thisEpoch := currentBlock / epochLength
if nextEpoch <= thisEpoch {
if currentBlock%epochLength > autoDAGepochHeight {
if thisEpoch > 0 {
previousDag, previousDagFull := dagFiles(thisEpoch - 1)
os.Remove(filepath.Join(ethash.DefaultDir, previousDag))
os.Remove(filepath.Join(ethash.DefaultDir, previousDagFull))
glog.V(logger.Info).Infof("removed DAG for epoch %d (%s)", thisEpoch-1, previousDag)
}
nextEpoch = thisEpoch + 1
dag, _ := dagFiles(nextEpoch)
if _, err := os.Stat(dag); os.IsNotExist(err) {
glog.V(logger.Info).Infof("Pregenerating DAG for epoch %d (%s)", nextEpoch, dag)
err := ethash.MakeDAG(nextEpoch*epochLength, "") // "" -> ethash.DefaultDir
if err != nil {
glog.V(logger.Error).Infof("Error generating DAG for epoch %d (%s)", nextEpoch, dag)
return
}
} else {
glog.V(logger.Error).Infof("DAG for epoch %d (%s)", nextEpoch, dag)
}
}
}
timer = time.After(autoDAGcheckInterval)
case <-self.autodagquit:
return
}
}
}()
}