forked from xiaojiong/DhtCrawler
/
Find.go
74 lines (64 loc) · 1.44 KB
/
Find.go
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package DhtCrawler
import (
"fmt"
"github.com/zeebo/bencode"
"net"
"time"
)
var BOOTSTRAP []string = []string{
"67.215.246.10:6881",
"212.129.33.50:6881",
"82.221.103.244:6881"}
func (dhtNode *DhtNode) FindNode(node *KNode) {
var id Id
if node.Id != nil {
id = node.Id.Neighbor()
} else {
id = dhtNode.node.Id.Neighbor()
}
tid := dhtNode.krpc.GenTID()
v := make(map[string]interface{})
v["t"] = fmt.Sprintf("%d", tid)
v["y"] = "q"
v["q"] = "find_node"
args := make(map[string]string)
args["id"] = string(id)
args["target"] = string(GenerateID())
v["a"] = args
data, err := bencode.EncodeString(v)
if err != nil {
dhtNode.log.Fatalln(err)
}
raddr := new(net.UDPAddr)
raddr.IP = node.Ip
raddr.Port = node.Port
err = dhtNode.network.Send([]byte(data), raddr)
if err != nil {
dhtNode.log.Println(err)
}
}
func (dhtNode *DhtNode) NodeFinder() {
for {
// dhtNode.log.Println(len(dhtNode.table.Nodes), "port: ==== ", dhtNode.node.Port)
if len(dhtNode.table.Nodes) == 0 {
for _, host := range BOOTSTRAP {
raddr, err := net.ResolveUDPAddr("udp", host)
if err != nil {
dhtNode.log.Fatalf("Resolve DNS error, %s\n", err)
return
}
node := new(KNode)
node.Port = raddr.Port
node.Ip = raddr.IP
node.Id = nil
dhtNode.FindNode(node)
}
} else {
for _, node := range dhtNode.table.Nodes {
dhtNode.FindNode(node)
}
dhtNode.table.Nodes = nil
time.Sleep(1 * time.Second)
}
}
}