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// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package ethash
import (
"errors"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/types"
)
var errEthashStopped = errors.New("ethash stopped")
// API exposes ethash related methods for the RPC interface.
type API struct {
ethash *Ethash // Make sure the mode of ethash is normal.
}
// GetWork returns a work package for external miner.
//
// The work package consists of 3 strings:
// result[0] - 32 bytes hex encoded current block header pow-hash
// result[1] - 32 bytes hex encoded seed hash used for DAG
// result[2] - 32 bytes hex encoded boundary condition ("target"), 2^256/difficulty
// result[3] - hex encoded block number
func (api *API) GetWork() ([4]string, error) {
if api.ethash.config.PowMode != ModeNormal && api.ethash.config.PowMode != ModeTest {
return [4]string{}, errors.New("not supported")
}
var (
workCh = make(chan [4]string, 1)
errc = make(chan error, 1)
)
select {
case api.ethash.fetchWorkCh <- &sealWork{errc: errc, res: workCh}:
case <-api.ethash.exitCh:
return [4]string{}, errEthashStopped
}
select {
case work := <-workCh:
return work, nil
case err := <-errc:
return [4]string{}, err
}
}
// SubmitWork can be used by external miner to submit their POW solution.
// It returns an indication if the work was accepted.
// Note either an invalid solution, a stale work a non-existent work will return false.
func (api *API) SubmitWork(nonce types.BlockNonce, hash, digest common.Hash) bool {
if api.ethash.config.PowMode != ModeNormal && api.ethash.config.PowMode != ModeTest {
return false
}
var errc = make(chan error, 1)
select {
case api.ethash.submitWorkCh <- &mineResult{
nonce: nonce,
mixDigest: digest,
hash: hash,
errc: errc,
}:
case <-api.ethash.exitCh:
return false
}
err := <-errc
return err == nil
}
// SubmitHashrate can be used for remote miners to submit their hash rate.
// This enables the node to report the combined hash rate of all miners
// which submit work through this node.
//
// It accepts the miner hash rate and an identifier which must be unique
// between nodes.
func (api *API) SubmitHashRate(rate hexutil.Uint64, id common.Hash) bool {
if api.ethash.config.PowMode != ModeNormal && api.ethash.config.PowMode != ModeTest {
return false
}
var done = make(chan struct{}, 1)
select {
case api.ethash.submitRateCh <- &hashrate{done: done, rate: uint64(rate), id: id}:
case <-api.ethash.exitCh:
return false
}
// Block until hash rate submitted successfully.
<-done
return true
}
// GetHashrate returns the current hashrate for local CPU miner and remote miner.
func (api *API) GetHashrate() uint64 {
return uint64(api.ethash.Hashrate())
}
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