forked from NyaaPantsu/nyaa
-
Notifications
You must be signed in to change notification settings - Fork 0
/
transaction.go
146 lines (128 loc) · 3.42 KB
/
transaction.go
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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
package scraperService
import (
"encoding/binary"
"encoding/hex"
"net"
"time"
"github.com/ewhal/nyaa/db"
"github.com/ewhal/nyaa/model"
"github.com/ewhal/nyaa/util/log"
)
// TransactionTimeout 30 second timeout for transactions
const TransactionTimeout = time.Second * 30
const stateSendID = 0
const stateRecvID = 1
const stateTransact = 2
const actionError = 3
const actionScrape = 2
const actionAnnounce = 1
const actionConnect = 0
// Transaction a scrape transaction on a udp tracker
type Transaction struct {
TransactionID uint32
ConnectionID uint64
bucket *Bucket
state uint8
swarms []model.Torrent
lastData time.Time
}
// Done marks this transaction as done and removes it from parent
func (t *Transaction) Done() {
t.bucket.Forget(t.TransactionID)
}
func (t *Transaction) handleScrapeReply(data []byte) {
data = data[8:]
now := time.Now()
for idx := range t.swarms {
t.swarms[idx].Seeders = binary.BigEndian.Uint32(data)
data = data[4:]
t.swarms[idx].Completed = binary.BigEndian.Uint32(data)
data = data[4:]
t.swarms[idx].Leechers = binary.BigEndian.Uint32(data)
data = data[4:]
t.swarms[idx].LastScrape = now
idx++
}
}
const pgQuery = "UPDATE torrents SET seeders = $1 , leechers = $2 , completed = $3 , last_scrape = $4 WHERE torrent_id = $5"
const sqliteQuery = "UPDATE torrents SET seeders = ? , leechers = ? , completed = ? , last_scrape = ? WHERE torrent_id = ?"
// Sync syncs models with database
func (t *Transaction) Sync() (err error) {
q := pgQuery
if db.IsSqlite {
q = sqliteQuery
}
tx, e := db.ORM.DB().Begin()
err = e
if err == nil {
for idx := range t.swarms {
_, err = tx.Exec(q, t.swarms[idx].Seeders, t.swarms[idx].Leechers, t.swarms[idx].Completed, t.swarms[idx].LastScrape, t.swarms[idx].ID)
}
tx.Commit()
}
return
}
// create send event
func (t *Transaction) SendEvent(to net.Addr) (ev *SendEvent) {
ev = &SendEvent{
To: to,
}
if t.state == stateRecvID {
l := len(t.swarms) * 20
l += 16
ev.Data = make([]byte, l)
binary.BigEndian.PutUint64(ev.Data[:], t.ConnectionID)
binary.BigEndian.PutUint32(ev.Data[8:], 2)
binary.BigEndian.PutUint32(ev.Data[12:], t.TransactionID)
for idx := range t.swarms {
ih, err := hex.DecodeString(t.swarms[idx].Hash)
if err == nil && len(ih) == 20 {
copy(ev.Data[16+(idx*20):], ih)
}
}
t.state = stateTransact
} else if t.state == stateSendID {
ev.Data = make([]byte, 16)
binary.BigEndian.PutUint64(ev.Data, InitialConnectionID)
binary.BigEndian.PutUint32(ev.Data[8:], 0)
binary.BigEndian.PutUint32(ev.Data[12:], t.TransactionID)
t.state = stateRecvID
}
t.lastData = time.Now()
return
}
func (t *Transaction) handleError(msg string) {
log.Infof("scrape failed: %s", msg)
}
// handle data for transaction
func (t *Transaction) GotData(data []byte) (done bool) {
t.lastData = time.Now()
if len(data) > 4 {
cmd := binary.BigEndian.Uint32(data)
switch cmd {
case actionConnect:
if len(data) == 16 {
if t.state == stateRecvID {
t.ConnectionID = binary.BigEndian.Uint64(data[8:])
}
}
break
case actionScrape:
if len(data) == (12*len(t.swarms))+8 && t.state == stateTransact {
t.handleScrapeReply(data)
}
done = true
break
case actionError:
if len(data) == 12 {
t.handleError(string(data[4:12]))
}
default:
done = true
}
}
return
}
func (t *Transaction) IsTimedOut() bool {
return t.lastData.Add(TransactionTimeout).Before(time.Now())
}