forked from prettymuchbryce/kademlia
/
dht.go
841 lines (718 loc) · 21 KB
/
dht.go
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package kademlia
import (
"bytes"
"context"
"errors"
"fmt"
"log"
"math"
"sort"
"sync"
"time"
b58 "github.com/jbenet/go-base58"
)
// DHT represents the state of the local node in the distributed hash table
type DHT struct {
ht *HashTable
HT *HashTable
options *Options
networking networking
store Store
}
// Options contains configuration options for the local node
type Options struct {
ID []byte
// The local IPv4 or IPv6 address
IP string
// The local port to listen for connections on
Port string
// Whether or not to use the STUN protocol to determine public IP and Port
// May be necessary if the node is behind a NAT
UseStun bool
// Specifies the the host of the STUN server. If left empty will use the
// default specified in go-stun.
StunAddr string
// A logger interface
Logger log.Logger
// The nodes being used to bootstrap the network. Without a bootstrap
// node there is no way to connect to the network. NetworkNodes can be
// initialized via dht.NewNetworkNode()
BootstrapNodes []*NetworkNode
// The time after which a key/value pair expires;
// this is a time-to-live (TTL) from the original publication date
TExpire time.Duration
// Seconds after which an otherwise unaccessed bucket must be refreshed
TRefresh time.Duration
// The interval between Kademlia replication events, when a node is
// required to publish its entire database
TReplicate time.Duration
// The time after which the original publisher must
// republish a key/value pair. Currently not implemented.
TRepublish time.Duration
// The maximum time to wait for a response from a node before discarding
// it from the bucket
TPingMax time.Duration
// The maximum time to wait for a response to any message
TMsgTimeout time.Duration
}
// NewDHT initializes a new DHT node. A store and options struct must be
// provided.
func NewDHT(store Store, options *Options) (*DHT, error) {
dht := &DHT{}
dht.options = options
ht, err := newHashTable(options)
if err != nil {
return nil, err
}
dht.store = store
dht.ht = ht
dht.HT = ht
dht.networking = &realNetworking{}
store.Init()
if options.TExpire == 0 {
options.TExpire = time.Second * 86410
}
if options.TRefresh == 0 {
options.TRefresh = time.Second * 3600
}
if options.TReplicate == 0 {
options.TReplicate = time.Second * 3600
}
if options.TRepublish == 0 {
options.TRepublish = time.Second * 86400
}
if options.TPingMax == 0 {
options.TPingMax = time.Second * 1
}
if options.TMsgTimeout == 0 {
options.TMsgTimeout = time.Second * 2
}
return dht, nil
}
func (dht *DHT) getExpirationTime(key []byte) time.Time {
bucket := getBucketIndexFromDifferingBit(key, dht.ht.Self.ID)
var total int
for i := 0; i < bucket; i++ {
total += dht.ht.getTotalNodesInBucket(i)
}
closer := dht.ht.getAllNodesInBucketCloserThan(bucket, key)
score := total + len(closer)
if score == 0 {
score = 1
}
if score > k {
return time.Now().Add(dht.options.TExpire)
}
day := dht.options.TExpire
seconds := day.Nanoseconds() * int64(math.Exp(float64(k/score)))
dur := time.Second * time.Duration(seconds)
return time.Now().Add(dur)
}
// GetExpirationTime returns the expiration time for a bucket
func (dht *DHT) GetExpirationTime(key []byte) time.Time {
return dht.getExpirationTime(key)
}
// Store stores data on the network. This will trigger an iterateStore message.
// The base58 encoded identifier will be returned if the store is successful.
func (dht *DHT) Store(data []byte) (id string, err error) {
key := dht.store.GetKey(data)
expiration := dht.getExpirationTime(key)
replication := time.Now().Add(dht.options.TReplicate)
dht.store.Store(key, data, replication, expiration, true)
_, _, err = dht.Iterate(iterateStore, key[:], data)
if err != nil {
return "", err
}
str := b58.Encode(key)
return str, nil
}
// Get retrieves data from the networking using key. Key is the base58 encoded
// identifier of the data.
func (dht *DHT) Get(key string) (data []byte, found bool, err error) {
keyBytes := b58.Decode(key)
value, exists := dht.store.Retrieve(keyBytes)
if len(keyBytes) != k {
return nil, false, errors.New("Invalid key")
}
if !exists {
var err error
value, _, err = dht.Iterate(iterateFindValue, keyBytes, nil)
if err != nil {
return nil, false, err
}
if value != nil {
exists = true
}
}
return value, exists, nil
}
// NumNodes returns the total number of nodes stored in the local routing table
func (dht *DHT) NumNodes() int {
return dht.ht.totalNodes()
}
// GetSelfID returns the base58 encoded identifier of the local node
func (dht *DHT) GetSelfID() string {
str := b58.Encode(dht.ht.Self.ID)
return str
}
// GetNetworkAddr returns the publicly accessible IP and Port of the local
// node
func (dht *DHT) GetNetworkAddr() string {
return dht.networking.getNetworkAddr()
}
// CreateSocket attempts to open a UDP socket on the port provided to options
func (dht *DHT) CreateSocket() error {
ip := dht.options.IP
port := dht.options.Port
if ip == "" {
ip = "0.0.0.0"
}
if port == "" {
port = "3000"
}
netMsgInit()
dht.networking.init(dht.ht.Self)
publicHost, publicPort, err := dht.networking.createSocket(ip, port, dht.options.UseStun, dht.options.StunAddr)
if err != nil {
return err
}
if dht.options.UseStun {
dht.ht.setSelfAddr(publicHost, publicPort)
}
return nil
}
// Listen begins listening on the socket for incoming messages
func (dht *DHT) Listen() error {
if !dht.networking.isInitialized() {
return errors.New("socket not created")
}
go dht.listen()
go dht.timers()
return dht.networking.listen()
}
// Bootstrap attempts to bootstrap the network using the BootstrapNodes provided
// to the Options struct. This will trigger an iterativeFindNode to the provided
// BootstrapNodes.
func (dht *DHT) Bootstrap() error {
if len(dht.options.BootstrapNodes) == 0 {
return nil
}
expectedResponses := []*expectedResponse{}
wg := &sync.WaitGroup{}
for _, bn := range dht.options.BootstrapNodes {
query := &message{}
query.Sender = dht.ht.Self
query.Receiver = bn
query.Type = messageTypePing
// if bn.ID == nil {
res, err := dht.networking.sendMessage(query, true, -1)
if err != nil {
continue
}
wg.Add(1)
expectedResponses = append(expectedResponses, res)
// } else {
node := newNode(bn)
dht.addNode(node)
// }
}
numExpectedResponses := len(expectedResponses)
if numExpectedResponses > 0 {
for _, r := range expectedResponses {
go func(r *expectedResponse) {
select {
case result := <-r.ch:
// If result is nil, channel was closed
if result != nil {
dht.addNode(newNode(result.Sender))
}
wg.Done()
return
case <-time.After(dht.options.TMsgTimeout):
dht.networking.cancelResponse(r)
wg.Done()
return
}
}(r)
}
}
wg.Wait()
if dht.NumNodes() > 0 {
_, _, err := dht.Iterate(iterateFindNode, dht.ht.Self.ID, nil)
return err
}
return nil
}
// Ping sends a message to the specifed node if a response before the timeout occurs,
// true is returned false otherwise
func (dht *DHT) Ping(node *NetworkNode) (ok bool, err error) {
query := &message{
Sender: dht.ht.Self,
Receiver: node,
Type: messageTypePing,
}
res, err := dht.networking.sendMessage(query, true, -1)
if err != nil {
return false, err
}
select {
case result := <-res.ch:
// If result is nil, channel was closed
if result != nil {
if string(result.Sender.ID) == string(node.ID) {
return true, nil
}
}
return
case <-time.After(dht.options.TMsgTimeout):
dht.networking.cancelResponse(res)
return false, nil
}
}
// Disconnect will trigger a disconnect from the network. All underlying sockets
// will be closed.
func (dht *DHT) Disconnect() error {
// TODO if .CreateSocket() is called, but .Listen() is never called, we
// don't provide a way to close the socket
return dht.networking.disconnect()
}
// Iterate does an iterative search through the network. This can be done
// for multiple reasons. These reasons include:
// iterativeStore - Used to store new information in the network.
// iterativeFindNode - Used to bootstrap the network.
// iterativeFindValue - Used to find a value among the network given a key.
func (dht *DHT) Iterate(t int, target []byte, data []byte) (value []byte, closest []*NetworkNode, err error) {
sl := dht.ht.getClosestContacts(alpha, target, []*NetworkNode{})
// We keep track of nodes contacted so far. We don't contact the same node
// twice.
var contacted = make(map[string]bool)
// According to the Kademlia white paper, after a round of FIND_NODE RPCs
// fails to provide a node closer than closestNode, we should send a
// FIND_NODE RPC to all remaining nodes in the shortlist that have not
// yet been contacted.
queryRest := false
// We keep a reference to the closestNode. If after performing a search
// we do not find a closer node, we stop searching.
if len(sl.Nodes) == 0 {
return nil, nil, nil
}
closestNode := sl.Nodes[0]
if t == iterateFindNode {
bucket := getBucketIndexFromDifferingBit(target, dht.ht.Self.ID)
dht.ht.resetRefreshTimeForBucket(bucket)
}
removeFromShortlist := []*NetworkNode{}
for {
expectedResponses := []*expectedResponse{}
numExpectedResponses := 0
// Next we send messages to the first (closest) alpha nodes in the
// shortlist and wait for a response
for i, node := range sl.Nodes {
// Contact only alpha nodes
if i >= alpha && !queryRest {
break
}
// Don't contact nodes already contacted
if contacted[string(node.ID)] == true {
continue
}
contacted[string(node.ID)] = true
query := &message{}
query.Sender = dht.ht.Self
query.Receiver = node
switch t {
case iterateFindNode:
query.Type = messageTypeFindNode
queryData := &queryDataFindNode{}
queryData.Target = target
query.Data = queryData
case iterateFindValue:
query.Type = messageTypeFindValue
queryData := &queryDataFindValue{}
queryData.Target = target
query.Data = queryData
case iterateStore:
query.Type = messageTypeFindNode
queryData := &queryDataFindNode{}
queryData.Target = target
query.Data = queryData
default:
panic("Unknown iterate type")
}
// Send the async queries and wait for a response
res, err := dht.networking.sendMessage(query, true, -1)
if err != nil {
// Node was unreachable for some reason. We will have to remove
// it from the shortlist, but we will keep it in our routing
// table in hopes that it might come back online in the future.
removeFromShortlist = append(removeFromShortlist, query.Receiver)
continue
}
expectedResponses = append(expectedResponses, res)
}
for _, n := range removeFromShortlist {
sl.RemoveNode(n)
}
numExpectedResponses = len(expectedResponses)
resultChan := make(chan (*message))
for _, r := range expectedResponses {
go func(r *expectedResponse) {
select {
case result := <-r.ch:
if result == nil {
// Channel was closed
return
}
dht.addNode(newNode(result.Sender))
resultChan <- result
return
case <-time.After(dht.options.TMsgTimeout):
dht.networking.cancelResponse(r)
return
}
}(r)
}
var results []*message
if numExpectedResponses > 0 {
Loop:
for {
select {
case result := <-resultChan:
if result != nil {
results = append(results, result)
} else {
numExpectedResponses--
}
if len(results) == numExpectedResponses {
close(resultChan)
break Loop
}
case <-time.After(dht.options.TMsgTimeout):
close(resultChan)
break Loop
}
}
for _, result := range results {
if result.Error != nil {
sl.RemoveNode(result.Receiver)
continue
}
switch t {
case iterateFindNode:
responseData := result.Data.(*responseDataFindNode)
sl.AppendUniqueNetworkNodes(responseData.Closest)
case iterateFindValue:
responseData := result.Data.(*responseDataFindValue)
// TODO When an iterativeFindValue succeeds, the initiator must
// store the key/value pair at the closest node seen which did
// not return the value.
if responseData.Value != nil {
return responseData.Value, nil, nil
}
sl.AppendUniqueNetworkNodes(responseData.Closest)
case iterateStore:
responseData := result.Data.(*responseDataFindNode)
sl.AppendUniqueNetworkNodes(responseData.Closest)
}
}
}
if !queryRest && len(sl.Nodes) == 0 {
return nil, nil, nil
}
sort.Sort(sl)
// If closestNode is unchanged then we are done
if bytes.Compare(sl.Nodes[0].ID, closestNode.ID) == 0 || queryRest {
// We are done
switch t {
case iterateFindNode:
if !queryRest {
queryRest = true
continue
}
return nil, sl.Nodes, nil
case iterateFindValue:
return nil, sl.Nodes, nil
case iterateStore:
for i, n := range sl.Nodes {
if i >= k {
return nil, nil, nil
}
query := &message{}
query.Receiver = n
query.Sender = dht.ht.Self
query.Type = messageTypeStore
queryData := &queryDataStore{}
queryData.Data = data
query.Data = queryData
dht.networking.sendMessage(query, false, -1)
}
return nil, nil, nil
}
} else {
closestNode = sl.Nodes[0]
}
}
}
// FindNode looks up a given nodeID on the network returning an array of the closest nodes
// if found, the first node in the array will be the request node.
func (dht *DHT) FindNode(ID []byte) ([]*NetworkNode, error) {
sl := dht.ht.getClosestContacts(20, ID, []*NetworkNode{})
// We keep track of nodes contacted so far. We don't contact the same node
// twice.
var contacted = make(map[string]bool)
// According to the Kademlia white paper, after a round of FIND_NODE RPCs
// fails to provide a node closer than closestNode, we should send a
// FIND_NODE RPC to all remaining nodes in the shortlist that have not
// yet been contacted.
queryRest := false
// We keep a reference to the closestNode. If after performing a search
// we do not find a closer node, we stop searching.
if len(sl.Nodes) == 0 {
return nil, nil
}
closestNode := sl.Nodes[0]
// TODO: what does this do ?
bucket := getBucketIndexFromDifferingBit(ID, dht.ht.Self.ID)
dht.ht.resetRefreshTimeForBucket(bucket)
removeFromShortlist := []*NetworkNode{}
for {
expectedResponses := []*expectedResponse{}
numExpectedResponses := 0
// Next we send messages to the first (closest) alpha nodes in the
// shortlist and wait for a response
for i, node := range sl.Nodes {
// Contact only alpha nodes
if i >= alpha && !queryRest {
break
}
// Don't contact nodes already contacted
if contacted[string(node.ID)] == true {
continue
}
contacted[string(node.ID)] = true
query := &message{
Sender: dht.ht.Self,
Receiver: node,
Type: messageTypeFindNode,
Data: &queryDataFindNode{Target: ID},
}
// Send the async queries and wait for a response
res, err := dht.networking.sendMessage(query, true, -1)
if err != nil {
fmt.Printf("unreachable: %v\n", query.Receiver.ID)
// Node was unreachable for some reason. We will have to remove
// it from the shortlist, but we will keep it in our routing
// table in hopes that it might come back online in the future.
// TODO: should we?
// why not just remove here instead of appending?
removeFromShortlist = append(removeFromShortlist, query.Receiver)
continue
}
expectedResponses = append(expectedResponses, res)
}
for _, n := range removeFromShortlist {
sl.RemoveNode(n)
}
numExpectedResponses = len(expectedResponses)
resultChan := make(chan (*message))
for _, r := range expectedResponses {
go func(r *expectedResponse) {
select {
case result := <-r.ch:
if result == nil {
// Channel was closed :(
return
}
dht.addNode(newNode(result.Sender))
resultChan <- result
return
case <-time.After(dht.options.TMsgTimeout):
dht.networking.cancelResponse(r)
return
}
}(r)
}
var results []*message
if numExpectedResponses > 0 {
Loop:
for {
select {
case result := <-resultChan:
if result != nil {
results = append(results, result)
} else {
numExpectedResponses--
}
if len(results) == numExpectedResponses {
close(resultChan)
break Loop
}
case <-time.After(dht.options.TMsgTimeout):
close(resultChan)
break Loop
}
}
for _, result := range results {
if result.Error != nil {
sl.RemoveNode(result.Receiver)
continue
}
responseData := result.Data.(*responseDataFindNode)
sl.AppendUniqueNetworkNodes(responseData.Closest)
}
}
if !queryRest && len(sl.Nodes) == 0 {
return nil, nil
}
sort.Sort(sl)
// If closestNode is unchanged then we are done
if bytes.Compare(sl.Nodes[0].ID, closestNode.ID) == 0 || queryRest {
// We are done
if !queryRest {
queryRest = true
continue
}
return sl.Nodes, nil
}
closestNode = sl.Nodes[0]
}
}
// FindNodes looks up all of the closest nodes to start and up to the provided limit
func (dht *DHT) FindNodes(ctx context.Context, start string, limit int) ([]*NetworkNode, error) {
nn, err := dht.FindNode([]byte(start))
if err != nil {
return nil, err
}
if len(nn) <= limit {
return nn, nil
}
return nn[:limit], nil
}
// addNode adds a node into the appropriate k bucket
// we store these buckets in big-endian order so we look at the bits
// from right to left in order to find the appropriate bucket
func (dht *DHT) addNode(node *node) {
index := getBucketIndexFromDifferingBit(dht.ht.Self.ID, node.ID)
// Make sure node doesn't already exist
// If it does, mark it as seen
if dht.ht.doesNodeExistInBucket(index, node.ID) {
dht.ht.markNodeAsSeen(node.ID)
return
}
dht.ht.mutex.Lock()
defer dht.ht.mutex.Unlock()
bucket := dht.ht.RoutingTable[index]
if len(bucket) == k {
// If the bucket is full we need to ping the first node to find out
// if it responds back in a reasonable amount of time. If not -
// we may remove it
n := bucket[0].NetworkNode
query := &message{}
query.Receiver = n
query.Sender = dht.ht.Self
query.Type = messageTypePing
res, err := dht.networking.sendMessage(query, true, -1)
if err != nil {
bucket = append(bucket, node)
bucket = bucket[1:]
} else {
select {
case <-res.ch:
return
case <-time.After(dht.options.TPingMax):
bucket = bucket[1:]
bucket = append(bucket, node)
}
}
} else {
bucket = append(bucket, node)
}
dht.ht.RoutingTable[index] = bucket
}
func (dht *DHT) timers() {
t := time.NewTicker(time.Second)
for {
select {
case <-t.C:
// Refresh
for i := 0; i < b; i++ {
if time.Since(dht.ht.getRefreshTimeForBucket(i)) > dht.options.TRefresh {
id := dht.ht.getRandomIDFromBucket(k)
dht.Iterate(iterateFindNode, id, nil)
}
}
// Replication
keys := dht.store.GetAllKeysForReplication()
for _, key := range keys {
value, _ := dht.store.Retrieve(key)
dht.Iterate(iterateStore, key, value)
}
// Expiration
dht.store.ExpireKeys()
case <-dht.networking.getDisconnect():
t.Stop()
dht.networking.timersFin()
return
}
}
}
func (dht *DHT) listen() {
for {
select {
case msg := <-dht.networking.getMessage():
if msg == nil {
// Disconnected
dht.networking.messagesFin()
return
}
switch msg.Type {
case messageTypeFindNode:
data := msg.Data.(*queryDataFindNode)
dht.addNode(newNode(msg.Sender))
closest := dht.ht.getClosestContacts(k, data.Target, []*NetworkNode{msg.Sender})
response := &message{IsResponse: true}
response.Sender = dht.ht.Self
response.Receiver = msg.Sender
response.Type = messageTypeFindNode
responseData := &responseDataFindNode{}
responseData.Closest = closest.Nodes
response.Data = responseData
dht.networking.sendMessage(response, false, msg.ID)
case messageTypeFindValue:
data := msg.Data.(*queryDataFindValue)
dht.addNode(newNode(msg.Sender))
value, exists := dht.store.Retrieve(data.Target)
response := &message{IsResponse: true}
response.ID = msg.ID
response.Receiver = msg.Sender
response.Sender = dht.ht.Self
response.Type = messageTypeFindValue
responseData := &responseDataFindValue{}
if exists {
responseData.Value = value
} else {
closest := dht.ht.getClosestContacts(k, data.Target, []*NetworkNode{msg.Sender})
responseData.Closest = closest.Nodes
}
response.Data = responseData
dht.networking.sendMessage(response, false, msg.ID)
case messageTypeStore:
data := msg.Data.(*queryDataStore)
dht.addNode(newNode(msg.Sender))
key := dht.store.GetKey(data.Data)
expiration := dht.getExpirationTime(key)
replication := time.Now().Add(dht.options.TReplicate)
dht.store.Store(key, data.Data, replication, expiration, false)
case messageTypePing:
response := &message{IsResponse: true}
response.Sender = dht.ht.Self
response.Receiver = msg.Sender
response.Type = messageTypePing
dht.networking.sendMessage(response, false, msg.ID)
}
case <-dht.networking.getDisconnect():
dht.networking.messagesFin()
return
}
}
}