add node structure (cmd, config...)

cmd/cmd.go

@@ -0,0 +1,40 @@
+package cmd
+
+import (
+	"go-dht/config"
+	"go-dht/node"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/urfave/cli"
+)
+
+var NodeCommands = []cli.Command{
+	{
+		Name:   "start",
+		Usage:  "start the node",
+		Action: cmdStart,
+	},
+}
+
+func cmdStart(c *cli.Context) error {
+	if err := config.MustRead(c); err != nil {
+		return err
+	}
+
+	var n node.Node
+	var err error
+	if config.C.ID != "" {
+		n, err = node.LoadNode(config.C.ID)
+		if err != nil {
+			return err
+		}
+		log.Info("Node loaded with ID: ", n.ID())
+	} else {
+		n, err = node.NewNode()
+		if err != nil {
+			return err
+		}
+		log.Info("New node created with ID: ", n.ID())
+	}
+	return nil
+}

config.yaml

@@ -0,0 +1,2 @@
+id: "1564a997c00e9b168705f9ca9d87f4ba5efefef7"
+port: 5000

config/config.go

@@ -0,0 +1,31 @@
+package config
+
+import (
+	"github.com/spf13/viper"
+	"github.com/urfave/cli"
+)
+
+type Config struct {
+	ID   string
+	Port string
+}
+
+var C Config
+
+func MustRead(c *cli.Context) error {
+	viper.SetConfigType("yaml")
+	viper.SetConfigName("config")
+	viper.AddConfigPath(".")
+
+	if c.GlobalString("config") != "" {
+		viper.SetConfigFile(c.GlobalString("config"))
+	}
+
+	if err := viper.ReadInConfig(); err != nil {
+		return err
+	}
+	if err := viper.Unmarshal(&C); err != nil {
+		return err
+	}
+	return nil
+}

go.mod

@@ -2,4 +2,12 @@ module go-dht
 
 go 1.12
 
-require github.com/stretchr/testify v1.4.0
+require (
+	github.com/fatih/color v1.7.0
+	github.com/kvartalo/relay v0.0.2
+	github.com/prometheus/common v0.4.0
+	github.com/sirupsen/logrus v1.4.1
+	github.com/spf13/viper v1.6.1
+	github.com/stretchr/testify v1.4.0
+	github.com/urfave/cli v1.22.2
+)

go.sum

@@ -1,10 +1,227 @@
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id.go → kademlia/id.go

@@ -1,4 +1,4 @@
-package main
+package kademlia
 
 import (
 	"bytes"

id_test.go → kademlia/id_test.go

@@ -1,4 +1,4 @@
-package main
+package kademlia
 
 import (
 	"testing"

kademlia.go → kademlia/kademlia.go

@@ -1,4 +1,4 @@
-package main
+package kademlia
 
 import (
 	"math/bits"
@@ -16,14 +16,20 @@ type ListedNode struct {
 	Addr string
 }
 
-type Node struct {
+type Kademlia struct {
 	ID       ID
 	KBuckets [B * 8][]ListedNode
 }
 
-func (n Node) String() string {
-	r := "Node ID: " + n.ID.String() + ", KBuckets:\n"
-	for i, kb := range n.KBuckets {
+func NewKademliaTable(id ID) *Kademlia {
+	return &Kademlia{
+		ID: id,
+	}
+}
+
+func (kad Kademlia) String() string {
+	r := "Node ID: " + kad.ID.String() + ", KBuckets:\n"
+	for i, kb := range kad.KBuckets {
 		if len(kb) > 0 {
 			r += "	KBucket " + strconv.Itoa(i) + "\n"
 			for _, e := range kb {
@@ -34,30 +40,8 @@ func (n Node) String() string {
 	return r
 }
 
-func NewNode() (Node, error) {
-	// TODO if node already has id, import it
-	id, err := NewID()
-	if err != nil {
-		return Node{}, err
-	}
-
-	var n Node
-	n.ID = id
-	return n, nil
-}
-
-func LoadNode(idStr string) (Node, error) {
-	id, err := IDFromString("0fd85ddddf15aeec2d5d8b01b013dbca030a18d7")
-	if err != nil {
-		return Node{}, err
-	}
-	var n Node
-	n.ID = id
-	return n, nil
-}
-
-func (n Node) KBucket(o ID) int {
-	d := n.ID.Distance(o)
+func (kad Kademlia) KBucket(o ID) int {
+	d := kad.ID.Distance(o)
 	return kBucketByDistance(d[:])
 
 }
@@ -71,27 +55,27 @@ func kBucketByDistance(b []byte) int {
 	return (B*8 - 1) - (B*8 - 1)
 }
 
-func (n *Node) Update(o ListedNode) {
-	k := n.KBucket(o.ID)
-	kb := n.KBuckets[k]
+func (kad *Kademlia) Update(o ListedNode) {
+	k := kad.KBucket(o.ID)
+	kb := kad.KBuckets[k]
 	if len(kb) >= KBucketSize {
 		// if n.KBuckets[k] is alrady full, perform ping of the first element
-		n.Ping(k, o)
+		kad.Ping(k, o)
 		return
 	}
 	// check that is not already in the list
-	exist, pos := existsInListedNodes(n.KBuckets[k], o)
+	exist, pos := existsInListedNodes(kad.KBuckets[k], o)
 	if exist {
 		// update position of o to the bottom
-		n.KBuckets[k] = moveToBottom(n.KBuckets[k], pos)
+		kad.KBuckets[k] = moveToBottom(kad.KBuckets[k], pos)
 		return
 	}
 	// not exists, add it to the kBucket
-	n.KBuckets[k] = append(n.KBuckets[k], o)
+	kad.KBuckets[k] = append(kad.KBuckets[k], o)
 	return
 }
 
-func (n *Node) Ping(k int, o ListedNode) {
+func (kad *Kademlia) Ping(k int, o ListedNode) {
 	// TODO when rpc layer is done
 	// ping the n.KBuckets[k][0] (using goroutine)
 	// if no response (timeout), delete it and add 'o'

kademlia_test.go → kademlia/kademlia_test.go

@@ -1,4 +1,4 @@
-package main
+package kademlia
 
 import (
 	"fmt"
@@ -37,17 +37,18 @@ func TestCountZeros(t *testing.T) {
 	assert.Equal(t, 159-22, kBucketByDistance(b))
 }
 
-func TestNodeKBucket(t *testing.T) {
-	node, err := LoadNode("0fd85ddddf15aeec2d5d8b01b013dbca030a18d7")
+func TestKBucket(t *testing.T) {
+	idA, err := IDFromString("0fd85ddddf15aeec2d5d8b01b013dbca030a18d7")
 	assert.Nil(t, err)
+	kademlia := NewKademliaTable(idA)
 
-	d := node.KBucket(node.ID)
+	d := kademlia.KBucket(kademlia.ID)
 	assert.Equal(t, 0, d) // same node should have distance 0
 
 	idB, err := IDFromString("c48d8b53dbefb609ed4e94d386dd5b22efcb2c5b")
 	assert.Nil(t, err)
 
-	d = node.KBucket(idB)
+	d = kademlia.KBucket(idB)
 	assert.Equal(t, 159, d)
 }
 
@@ -97,20 +98,21 @@ func TestMoveToBottom(t *testing.T) {
 }
 
 func TestUpdate(t *testing.T) {
-	nodeA, err := LoadNode("0fd85ddddf15aeec2d5d8b01b013dbca030a18d7")
+	idA, err := IDFromString("0fd85ddddf15aeec2d5d8b01b013dbca030a18d7")
 	assert.Nil(t, err)
+	kademlia := NewKademliaTable(idA)
 
 	lns := prepareTestListedNodes()
 	for _, lnI := range lns {
-		nodeA.Update(lnI)
+		kademlia.Update(lnI)
 	}
 
 	if debug {
-		fmt.Println(nodeA)
+		fmt.Println(kademlia)
 	}
 
-	assert.Equal(t, len(nodeA.KBuckets[0]), 1)
-	assert.Equal(t, len(nodeA.KBuckets[1]), 1)
-	assert.Equal(t, len(nodeA.KBuckets[158]), 4)
-	assert.Equal(t, len(nodeA.KBuckets[159]), 5)
+	assert.Equal(t, len(kademlia.KBuckets[0]), 1)
+	assert.Equal(t, len(kademlia.KBuckets[1]), 1)
+	assert.Equal(t, len(kademlia.KBuckets[158]), 4)
+	assert.Equal(t, len(kademlia.KBuckets[159]), 5)
 }

main.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"os"
+
+	"go-dht/cmd"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/urfave/cli"
+)
+
+func main() {
+	app := cli.NewApp()
+	app.Name = "go-dht"
+	app.Version = "0.0.1-alpha"
+	app.Flags = []cli.Flag{
+		cli.StringFlag{Name: "config"},
+	}
+
+	app.Commands = []cli.Command{}
+	app.Commands = append(app.Commands, cmd.NodeCommands...)
+	err := app.Run(os.Args)
+	if err != nil {
+		log.Error(err.Error())
+	}
+}

node/node.go

@@ -0,0 +1,55 @@
+package node
+
+import (
+	"go-dht/kademlia"
+)
+
+type Node struct {
+	port     string
+	kademlia *kademlia.Kademlia
+}
+
+func NewNode() (Node, error) {
+	id, err := kademlia.NewID()
+	if err != nil {
+		return Node{}, err
+	}
+
+	var n Node
+	n.kademlia = kademlia.NewKademliaTable(id)
+	return n, nil
+}
+
+func LoadNode(idStr string) (Node, error) {
+	id, err := kademlia.IDFromString(idStr)
+	if err != nil {
+		return Node{}, err
+	}
+	var n Node
+	n.kademlia = kademlia.NewKademliaTable(id)
+	return n, nil
+}
+
+func (n Node) ID() kademlia.ID {
+	return n.kademlia.ID
+}
+
+// Exposed RPC calls: Ping, Store, FindNode, FindValue
+
+func (n *Node) Ping(ln kademlia.ListedNode, ack *bool) error {
+	n.kademlia.Update(ln)
+	return nil
+}
+
+func (n *Node) Store(data []byte, ack *bool) error {
+
+	return nil
+}
+
+func (n *Node) FindNode() {
+
+}
+
+func (n *Node) FindValue() {
+
+}