/
main.go
175 lines (161 loc) · 3.79 KB
/
main.go
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// testdirectory project main.go
package main
import (
"fmt"
"github.com/coreos/go-log/log"
"hash/crc32"
"math/rand"
"net/http"
"strings"
"sync"
"time"
)
var revnum = 0
// Maintains the big database
type KNode struct {
PublicKey string
Address string
ProtocolVersion int
Adjacents []int
ExitNode bool
}
// The database itself
var KDirectory = make([]KNode, 0)
// Global lock for the database
var DLock sync.RWMutex
// Get the adjacent nodes of an address
func GetAdjacentNodes(addr string) []int {
if len(KDirectory) == 0 {
return []int{}
}
addr = strings.Split(addr, ":")[0]
index := crc32.Checksum([]byte(addr), crc32.IEEETable)
toret := make([]int, 0)
for i := 0; i < 3; i++ {
ptr := KDirectory[int((index+uint32(i))%uint32(len(KDirectory)))]
if strings.Split(ptr.Address, ":")[0] != addr {
toret = append(toret, int((index+uint32(i))%uint32(len(KDirectory))))
}
}
return toret
}
// Add a node to the database
func AddNode(addr string, pkey string, pvers int, isexit bool) {
log.Infof("Adding %s with pkey %s and pvers %d", addr, pkey, pvers)
DLock.Lock()
defer func() {
DLock.Unlock()
revnum++
}()
for _, ele := range KDirectory {
if ele.Address == addr {
return
}
}
adj := GetAdjacentNodes(addr)
toadd := KNode{pkey, addr, pvers, adj, isexit}
KDirectory = append(KDirectory, toadd)
/*for i := 0; i < len(KDirectory); i++ {
nd := &KDirectory[i]
nd.Adjacents = GetAdjacentNodes(nd.Address)
}*/
// Now add the other direction
for i := 0; i < len(KDirectory); i++ {
lst := KDirectory[i].Adjacents
for j := 0; j < len(lst); j++ {
nd := &KDirectory[lst[j]]
nd.Adjacents = append(nd.Adjacents, i)
}
}
for i := 0; i < len(KDirectory); i++ {
nd := &KDirectory[i]
nd.Adjacents = FixDuplicates(nd.Adjacents)
}
}
// Deletes a node from the database
func DeleteNode(idx int) {
DLock.Lock()
defer func() {
DLock.Unlock()
}()
// new directory altogether
olddir := KDirectory
KDirectory = make([]KNode, len(olddir)-1)
for i := 0; i < idx; i++ {
KDirectory[i] = olddir[i]
}
for i := idx; i < len(KDirectory); i++ {
KDirectory[i] = olddir[i+1]
}
// remove all references to the old index
for i := 0; i < len(KDirectory); i++ {
newadj := make([]int, 0)
for j := 0; j < len(KDirectory[i].Adjacents); j++ {
if KDirectory[i].Adjacents[j] != idx {
newadj = append(newadj, KDirectory[i].Adjacents[j])
}
}
KDirectory[i].Adjacents = newadj
}
// update all references
for i := 0; i < len(KDirectory); i++ {
for j := 0; j < len(KDirectory[i].Adjacents); j++ {
if KDirectory[i].Adjacents[j] >= idx {
KDirectory[i].Adjacents[j]--
}
}
}
}
// Fixes duplicates
func FixDuplicates(thing []int) []int {
log.Debug(thing)
toret := make([]int, 0)
for i := 0; i < len(thing); i++ {
blah := false
for j := 0; j < len(toret); j++ {
if toret[j] == thing[i] {
blah = true
}
}
if !blah {
toret = append(toret, thing[i])
}
}
log.Debug(toret)
return toret
}
// Prints directory in R form
func PrintDirectoryR() {
DLock.RLock()
defer func() {
DLock.RUnlock()
}()
}
func RandomizeDirectory() {
go func() {
for i := 0; i == i; i++ {
fmt.Println(i)
fakeaddr := fmt.Sprintf("host%d:20000", i+1024)
AddNode(fakeaddr, "wtf", 200, true)
time.Sleep(time.Minute / time.Duration(10*(rand.Int()%10+2)))
}
}()
for i := 0; i == i; i++ {
fmt.Println(i)
if len(KDirectory) > 0 {
DeleteNode(rand.Int() % len(KDirectory))
}
time.Sleep(time.Minute / time.Duration(10*(rand.Int()%10+1)))
}
}
func main() {
go lifepatrol()
http.HandleFunc("/read", ReadDirectoryHandler)
http.HandleFunc("/longpoll", LPDirectoryHandler)
http.HandleFunc("/rformat", RFormatDirectoryHandler)
http.HandleFunc("/upload", UploadInfoHandler)
err := http.ListenAndServe(":8080", nil)
if err != nil {
panic(err.Error())
}
}