aboutsummaryrefslogtreecommitdiffstats
path: root/miner/agent.go
blob: e80b222c8329b8b5bb28c650363f01a7070c7a75 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
// Copyright 2015 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 miner

import (
    "sync"

    "sync/atomic"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/logger"
    "github.com/ethereum/go-ethereum/logger/glog"
    "github.com/ethereum/go-ethereum/pow"
)

type CpuAgent struct {
    mu sync.Mutex

    workCh        chan *Work
    quit          chan struct{}
    quitCurrentOp chan struct{}
    returnCh      chan<- *Result

    index int
    pow   pow.PoW

    isMining int32 // isMining indicates whether the agent is currently mining
}

func NewCpuAgent(index int, pow pow.PoW) *CpuAgent {
    miner := &CpuAgent{
        pow:   pow,
        index: index,
    }

    return miner
}

func (self *CpuAgent) Work() chan<- *Work            { return self.workCh }
func (self *CpuAgent) Pow() pow.PoW                  { return self.pow }
func (self *CpuAgent) SetReturnCh(ch chan<- *Result) { self.returnCh = ch }

func (self *CpuAgent) Stop() {
    self.mu.Lock()
    defer self.mu.Unlock()

    close(self.quit)
}

func (self *CpuAgent) Start() {
    self.mu.Lock()
    defer self.mu.Unlock()

    if !atomic.CompareAndSwapInt32(&self.isMining, 0, 1) {
        return // agent already started
    }

    self.quit = make(chan struct{})
    // creating current op ch makes sure we're not closing a nil ch
    // later on
    self.workCh = make(chan *Work, 1)

    go self.update()
}

func (self *CpuAgent) update() {
out:
    for {
        select {
        case work := <-self.workCh:
            self.mu.Lock()
            if self.quitCurrentOp != nil {
                close(self.quitCurrentOp)
            }
            self.quitCurrentOp = make(chan struct{})
            go self.mine(work, self.quitCurrentOp)
            self.mu.Unlock()
        case <-self.quit:
            self.mu.Lock()
            if self.quitCurrentOp != nil {
                close(self.quitCurrentOp)
                self.quitCurrentOp = nil
            }
            self.mu.Unlock()
            break out
        }
    }

done:
    // Empty work channel
    for {
        select {
        case <-self.workCh:
        default:
            close(self.workCh)
            break done
        }
    }

    atomic.StoreInt32(&self.isMining, 0)
}

func (self *CpuAgent) mine(work *Work, stop <-chan struct{}) {
    glog.V(logger.Debug).Infof("(re)started agent[%d]. mining...\n", self.index)

    // Mine
    nonce, mixDigest := self.pow.Search(work.Block, stop)
    if nonce != 0 {
        block := work.Block.WithMiningResult(nonce, common.BytesToHash(mixDigest))
        self.returnCh <- &Result{work, block}
    } else {
        self.returnCh <- nil
    }
}

func (self *CpuAgent) GetHashRate() int64 {
    return self.pow.GetHashrate()
}