Merge branch 'master' into tnx

.gitignore

@@ -0,0 +1,13 @@
+# IdeaIDE
+.idea
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+
+# Mac
+.DS_Store 

AppSpec.yml

@@ -0,0 +1,22 @@
+version: 0.0
+os: linux
+files:
+  - source: ./
+    destination: /home/ec2-user/projects/
+hooks:
+  BeforeInstall:
+    - location: aws-scripts/say_hello.sh
+      timeout: 300
+      runas: root
+  AfterInstall:
+    - location: aws-scripts/say_hello.sh #maybe start the server
+      timeout: 300
+      runas: root
+  ApplicationStart:
+    - location: aws-scripts/say_hello.sh  #maybe start the server.
+      timeout: 300
+      runas: root
+  ApplicationStop:
+    - location: aws-scripts/say_hello.sh
+      timeout: 300
+      runas: root

README.md

@@ -1,5 +1,10 @@
 # Harmony Benchmark
 
+## Usage
+
+./deploy.sh ipList.txt
+./send_txn.sh
+
 ## References
 
 https://github.com/lightningnetwork/lnd

aws-code/dial.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+        "fmt"
+        "io/ioutil"
+        "net"
+)
+
+func main() {
+        conn, err := net.Dial("tcp", ":9000")
+        if err != nil {
+                panic(err)
+        }
+        defer conn.Close()
+
+        bs, _ := ioutil.ReadAll(conn)
+        fmt.Println(string(bs))
+
+}

aws-code/listen.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+        "fmt"
+        "io"
+        "net"
+        "time"
+)
+
+func main() {
+        ln, err := net.Listen("tcp", "localhost:9000")
+        if err != nil {
+                panic(err)
+        }
+        defer ln.Close()
+
+        for {
+                conn, err := ln.Accept()
+                if err != nil {
+                        panic(err)
+                }
+
+                io.WriteString(conn, fmt.Sprint("Hello World\n", time.Now(), "\n"))
+conn.Close()
+}
+}

aws-scripts/say_hello.sh

@@ -0,0 +1 @@
+echo "Hi, I am in aws-scripts and its seems to have worked."

aws-setup/AppSpec.yml

@@ -0,0 +1,22 @@
+version: 0.0
+os: linux
+files:
+  - source: ../
+    destination: /projects/
+hooks:
+  BeforeInstall:
+    - location: aws-scripts/say_hello.sh
+      timeout: 300
+      runas: root
+  AfterInstall:
+    - location: aws-scripts/say_hello.sh #maybe start the server
+      timeout: 300
+      runas: root
+  ApplicationStart:
+    - location: aws-scripts/say_hello.sh  #maybe start the server.
+      timeout: 300
+      runas: root
+  ApplicationStop:
+    - location: aws-scripts/say_hello.sh
+      timeout: 300
+      runas: root

aws-setup/copy_code.sh

@@ -0,0 +1 @@
+scp -i main.pem -r ~/Documents/goworkspace/src/github.com/harmony-benchmark/ ec2-user@ec2-34-219-218-239.us-west-2.compute.amazonaws.com:/home/ec2-user/projects/

aws-setup/parse_json.py

@@ -0,0 +1,34 @@
+import json
+
+def get_public_ip(all_reservations):
+	all_public_ip_addresses = []
+	for individual_instances in all_reservations:
+		instance_information = individual_instances['Instances'][0]
+		if "running" != instance_information["State"]["Name"]:
+			continue
+		all_public_ip_addresses.append(instance_information['PublicIpAddress'])
+	return all_public_ip_addresses
+
+def make_peers_list(all_reservations,port="9001",filename="ipList.txt"):
+	p = get_public_ip(all_reservations)
+	f = open(filename,"w")
+	for i in range(len(p)):
+		if i == 0:
+			f.write(p[i] + " " + port + " " + "leader"+"\n")
+		else:
+			f.write(p[i] + " " + port + " " + "validator"+"\n")
+	f.close()
+
+def is_it_running(f):
+	pass
+
+if __name__ == "__main__":
+	json_data=open("aws.json").read()
+	f = json.loads(json_data)
+	all_reservations = f['Reservations']
+	
+	make_peers_list(all_reservations)
+	
+			
+			
+		

aws-setup/setup_instances.sh

@@ -0,0 +1 @@
+aws ec2 run-instances --image-id ami-e251209a --count 1 --instance-type t2.nano --key-name main --security-group-ids sg-066a8b0ec187c7247 

aws-setup/user-data.sh

@@ -0,0 +1,9 @@
+#!/bin/bash -x
+REGION=$(curl 169.254.169.254/latest/meta-data/placement/availability-zone/ | sed 's/[a-z]$//')
+yum update -y
+yum install ruby wget -y
+cd /home/ec2-user
+wget https://aws-codedeploy-$REGION.s3.amazonaws.com/latest/install
+chmod +x ./install
+./install auto
+mkdir projects

benchmark_node.go

@@ -1,10 +1,11 @@
 package main
 
 import (
+	"./consensus"
+	"./p2p"
 	"bufio"
 	"flag"
 	"fmt"
-	"io"
 	"log"
 	"net"
 	"os"
@@ -19,57 +20,28 @@ const (
 )
 
 // Start a server and process the request by a handler.
-func startServer(port int, handler func(net.Conn)) {
+func startServer(port string, handler func(net.Conn, *consensus.Consensus), consensus *consensus.Consensus) {
-	listen, err := net.Listen("tcp4", ":"+strconv.Itoa(port))
+	listen, err := net.Listen("tcp4", ":"+port)
 	defer listen.Close()
 	if err != nil {
-		log.Fatalf("Socket listen port %d failed,%s", port, err)
+		log.Fatalf("Socket listen port %s failed,%s", port, err)
 		os.Exit(1)
 	}
-	log.Printf("Begin listen port: %d", port)
+	log.Printf("Begin listen port: %s", port)
 	for {
 		conn, err := listen.Accept()
 		if err != nil {
+			log.Printf("Error listening on port: %s. Exiting.", port)
 			log.Fatalln(err)
 			continue
 		}
-		go handler(conn)
+		go handler(conn, consensus)
 	}
 }
 
-// Handler of the leader node.
+func relayToPorts(msg string, conn net.Conn) {
-func leaderHandler(conn net.Conn) {
+	w := bufio.NewWriter(conn)
-	defer conn.Close()
+	ports := convertIntoInts(msg)
-	var (
-		buf = make([]byte, 1024)
-		r   = bufio.NewReader(conn)
-		w   = bufio.NewWriter(conn)
-	)
-
-	receivedMessage := ""
-ILOOP:
-	for {
-		n, err := r.Read(buf)
-		data := string(buf[:n])
-
-		receivedMessage += data
-
-		switch err {
-		case io.EOF:
-			break ILOOP
-		case nil:
-			log.Println("Receive:", data)
-			if isTransportOver(data) {
-				break ILOOP
-			}
-
-		default:
-			log.Fatalf("Receive data failed:%s", err)
-			return
-		}
-	}
-	receivedMessage = strings.TrimSpace(receivedMessage)
-	ports := convertIntoInts(receivedMessage)
 	ch := make(chan int)
 	for i, port := range ports {
 		go Send(port, strconv.Itoa(i), ch)
@@ -82,6 +54,7 @@ ILOOP:
 	w.Write([]byte(Message))
 	w.Flush()
 	log.Printf("Send: %s", Message)
+
 }
 
 // Helper library to convert '1,2,3,4' into []int{1,2,3,4}.
@@ -125,6 +98,7 @@ func SocketClient(ip, message string, port int) (res string) {
 	return
 }
 
+//https://gist.github.com/kenshinx/5796276
 // Send a message to another node with given port.
 func Send(port int, message string, ch chan int) (returnMessage string) {
 	ip := "127.0.0.1"
@@ -134,53 +108,90 @@ func Send(port int, message string, ch chan int) (returnMessage string) {
 	return
 }
 
-// Handler for slave node.
+// Handler of the leader node.
-func slaveHandler(conn net.Conn) {
+func NodeHandler(conn net.Conn, consensus *consensus.Consensus) {
 	defer conn.Close()
-	var (
-		buf = make([]byte, 1024)
-		r   = bufio.NewReader(conn)
-		w   = bufio.NewWriter(conn)
-	)
 
-ILOOP:
+	payload, err := p2p.ReadMessagePayload(conn)
-	for {
+	if err != nil {
-		n, err := r.Read(buf)
+		if consensus.IsLeader {
-		data := string(buf[:n])
+			log.Fatalf("[Leader] Receive data failed:%s", err)
-
+		} else {
-		switch err {
+			log.Fatalf("[Slave] Receive data failed:%s", err)
-		case io.EOF:
-			break ILOOP
-		case nil:
-			log.Println("Receive:", data)
-			if isTransportOver(data) {
-				break ILOOP
-			}
-		default:
-			log.Fatalf("Receive data failed:%s", err)
-			return
 		}
 	}
-	w.Write([]byte(Message))
+	if consensus.IsLeader {
-	w.Flush()
+		consensus.ProcessMessageLeader(payload)
-	log.Printf("Send: %s", Message)
+	} else {
+		consensus.ProcessMessageValidator(payload)
+	}
+	//relayToPorts(receivedMessage, conn)
 }
 
-func isTransportOver(data string) (over bool) {
+func initConsensus(ip, port, ipfile string) consensus.Consensus {
-	over = strings.HasSuffix(data, "\r\n\r\n")
+	// The first Ip, port passed will be leader.
-	return
+	consensus := consensus.Consensus{}
+	peer := p2p.Peer{Port: port, Ip: ip}
+	Peers := getPeers(ip, port, ipfile)
+	leaderPeer := getLeader(ipfile)
+	if leaderPeer == peer {
+		consensus.IsLeader = true
+	} else {
+		consensus.IsLeader = false
+	}
+	consensus.Leader = leaderPeer
+	consensus.Validators = Peers
+
+	consensus.PriKey = ip + ":" + port // use ip:port as unique key for now
+	return consensus
+}
+
+func getLeader(iplist string) p2p.Peer {
+	file, _ := os.Open(iplist)
+	fscanner := bufio.NewScanner(file)
+	var leaderPeer p2p.Peer
+	for fscanner.Scan() {
+		p := strings.Split(fscanner.Text(), " ")
+		ip, port, status := p[0], p[1], p[2]
+		if status == "leader" {
+			leaderPeer.Ip = ip
+			leaderPeer.Port = port
+		}
+	}
+	return leaderPeer
+}
+
+func getPeers(Ip, Port, iplist string) []p2p.Peer {
+	file, _ := os.Open(iplist)
+	fscanner := bufio.NewScanner(file)
+	var peerList []p2p.Peer
+	for fscanner.Scan() {
+		p := strings.Split(fscanner.Text(), " ")
+		ip, port, status := p[0], p[1], p[2]
+		if status == "leader" || ip == Ip && port == Port {
+			continue
+		}
+		peer := p2p.Peer{Port: port, Ip: ip}
+		peerList = append(peerList, peer)
+	}
+	return peerList
 }
 
 func main() {
-	port := flag.Int("port", 3333, "port of the node.")
+	ip := flag.String("ip", "127.0.0.1", "IP of the node")
-	mode := flag.String("mode", "leader", "should be slave or leader")
+	port := flag.String("port", "9000", "port of the node.")
+	ipfile := flag.String("ipfile", "iplist.txt", "file containing all ip addresses")
 	flag.Parse()
-
+	fmt.Println()
-	if strings.ToLower(*mode) == "leader" {
+	consensus := initConsensus(*ip, *port, *ipfile)
-		// Start leader node.
+	var nodeStatus string
-		startServer(*port, leaderHandler)
+	if consensus.IsLeader {
-	} else if strings.ToLower(*mode) == "slave" {
+		nodeStatus = "leader"
-		// Start slave node.
+	} else {
-		startServer(*port, slaveHandler)
+		nodeStatus = "validator"
 	}
+	fmt.Println(consensus)
+	fmt.Printf("This node is a %s node with ip: %s and port: %s\n", nodeStatus, *ip, *port)
+	fmt.Println()
+	startServer(*port, NodeHandler, &consensus)
 }

consensus/consensus.go

@@ -0,0 +1,55 @@
+// Consensus package implements the Cosi PBFT consensus
+package consensus // consensus
+
+import (
+	"../p2p"
+)
+
+// Consensus data containing all info related to one consensus process
+type Consensus struct {
+	State ConsensusState
+	// Signatures collected from validators
+	Signatures []string
+	// Actual block data to reach consensus on
+	Data string
+	// List of validators
+	Validators []p2p.Peer
+	// Leader
+	Leader p2p.Peer
+	// private key of current node
+	PriKey string
+	// Whether I am leader. False means I am validator
+	IsLeader bool
+}
+
+// Consensus state enum for both leader and validator
+// States for leader:
+//     READY, ANNOUNCE_DONE, CHALLENGE_DONE, FINISHED
+// States for validator:
+//     READY, COMMIT_DONE, RESPONSE_DONE, FINISHED
+type ConsensusState int
+
+const (
+	READY ConsensusState = iota
+	ANNOUNCE_DONE
+	COMMIT_DONE
+	CHALLENGE_DONE
+	RESPONSE_DONE
+	FINISHED
+)
+
+// Returns string name for the ConsensusState enum
+func (state ConsensusState) String() string {
+	names := [...]string{
+		"READY",
+		"ANNOUNCE_DONE",
+		"COMMIT_DONE",
+		"CHALLENGE_DONE",
+		"RESPONSE_DONE",
+		"FINISHED"}
+
+	if state < READY || state > RESPONSE_DONE {
+		return "Unknown"
+	}
+	return names[state]
+}

consensus/consensus_leader.go

@@ -0,0 +1,79 @@
+package consensus
+
+import (
+	"log"
+	"fmt"
+	"../p2p"
+	"sync"
+)
+
+var mutex = &sync.Mutex{}
+
+// Leader's consensus message dispatcher
+func (consensus *Consensus) ProcessMessageLeader(message []byte) {
+	msgType, err := GetConsensusMessageType(message)
+	if err != nil {
+		log.Print(err)
+	}
+
+	payload, err := GetConsensusMessagePayload(message)
+	if err != nil {
+		log.Print(err)
+	}
+
+	msg := string(payload)
+	fmt.Printf("[Leader] Received and processing message: %s, %s\n", msgType, msg)
+	switch msgType {
+	case ANNOUNCE:
+		fmt.Println("Unexpected message type: %s", msgType)
+	case COMMIT:
+		consensus.processCommitMessage(msg)
+	case CHALLENGE:
+		fmt.Println("Unexpected message type: %s", msgType)
+	case RESPONSE:
+		consensus.processResponseMessage(msg)
+	case START_CONSENSUS:
+		consensus.processStartConsensusMessage(msg)
+	default:
+		fmt.Println("Unexpected message type: %s", msgType)
+	}
+}
+
+// Handler for message which triggers consensus process
+func (consensus *Consensus) processStartConsensusMessage(msg string) {
+	consensus.startConsensus(msg)
+}
+
+func (consensus *Consensus) startConsensus(msg string) {
+	// prepare message and broadcast to validators
+
+	msgToSend := ConstructConsensusMessage(ANNOUNCE, []byte("block"))
+	p2p.BroadcastMessage(consensus.Validators, msgToSend)
+	// Set state to ANNOUNCE_DONE
+	consensus.State = ANNOUNCE_DONE
+}
+
+func (consensus *Consensus) processCommitMessage(msg string) {
+	// verify and aggregate all the signatures
+	mutex.Lock()
+	consensus.Signatures = append(consensus.Signatures, msg)
+
+	// Broadcast challenge
+	// Set state to CHALLENGE_DONE
+	consensus.State = CHALLENGE_DONE
+	mutex.Unlock()
+
+	log.Printf("Number of signatures received: %d", len(consensus.Signatures))
+	if len(consensus.Signatures) >= (2 * len(consensus.Validators)) / 3 + 1 {
+		log.Printf("Consensus reached with %d signatures: %s", len(consensus.Signatures), consensus.Signatures)
+	}
+
+}
+
+func (consensus *Consensus) processResponseMessage(msg string) {
+	// verify and aggregate all signatures
+
+	// Set state to FINISHED
+	consensus.State = FINISHED
+
+}

consensus/consensus_validator.go

@@ -0,0 +1,62 @@
+package consensus
+
+import (
+	"log"
+	"fmt"
+	"../p2p"
+)
+
+// Validator's consensus message dispatcher
+func (consensus *Consensus) ProcessMessageValidator(message []byte) {
+	msgType, err := GetConsensusMessageType(message)
+	if err != nil {
+		log.Print(err)
+	}
+
+	payload, err := GetConsensusMessagePayload(message)
+	if err != nil {
+		log.Print(err)
+	}
+
+	msg := string(payload)
+	fmt.Printf("[Validator] Received and processing message: %s, %s\n", msgType, msg)
+	switch msgType {
+	case ANNOUNCE:
+		consensus.processAnnounceMessage(msg)
+	case COMMIT:
+		fmt.Println("Unexpected message type: %s", msgType)
+	case CHALLENGE:
+		consensus.processChallengeMessage(msg)
+	case RESPONSE:
+		fmt.Println("Unexpected message type: %s", msgType)
+	default:
+		fmt.Println("Unexpected message type: %s", msgType)
+	}
+}
+
+func (consensus *Consensus) processAnnounceMessage(msg string) {
+	// verify block data
+
+	// sign block
+
+	// TODO: return the signature(commit) to leader
+	// For now, simply return the private key of this node.
+	msgToSend := ConstructConsensusMessage(COMMIT, []byte(consensus.PriKey))
+	p2p.SendMessage(consensus.Leader, msgToSend)
+
+	// Set state to COMMIT_DONE
+	consensus.State = COMMIT_DONE
+
+}
+
+func (consensus *Consensus) processChallengeMessage(msg string) {
+	// verify block data and the aggregated signatures
+
+	// sign the message
+
+	// return the signature(response) to leader
+
+	// Set state to RESPONSE_DONE
+	consensus.State = RESPONSE_DONE
+}
+

consensus/message.go

@@ -0,0 +1,74 @@
+package consensus
+
+import (
+	"bytes"
+	"errors"
+)
+
+/*
+Consensus message is the payload of p2p message.
+Consensus message data structure:
+
+
+---- message start -----
+1 byte            - consensus.MessageType
+		            0x00 - ANNOUNCE
+                    0x01 - COMMIT
+                    ...
+payload (n bytes) - consensus message payload (the data to run consensus with)
+----  message end  -----
+
+*/
+
+const MESSAGE_TYPE_BYTES = 1
+
+// Consensus communication message type.
+// Leader and validator dispatch messages based on incoming message type
+type MessageType int
+
+const (
+	ANNOUNCE MessageType = iota
+	COMMIT
+	CHALLENGE
+	RESPONSE
+	START_CONSENSUS
+	ERROR = -1
+)
+
+// Returns string name for the MessageType enum
+func (msgType MessageType) String() string {
+	names := [...]string{
+		"ANNOUNCE",
+		"COMMIT",
+		"CHALLENGE",
+		"RESPONSE",
+		"START_CONSENSUS"}
+
+	if msgType < ANNOUNCE || msgType > START_CONSENSUS {
+		return "Unknown"
+	}
+	return names[msgType]
+}
+
+// Get the consensus message type from the p2p message payload
+func GetConsensusMessageType(message []byte) (MessageType, error) {
+	if len(message) < 1 {
+		return ERROR, errors.New("Failed to get consensus message type: no data available.")
+	}
+	return MessageType(message[0]), nil
+}
+
+// Get the consensus message payload from the p2p message payload
+func GetConsensusMessagePayload(message []byte) ([]byte, error) {
+	if len(message) < 2 {
+		return []byte{}, errors.New("Failed to get consensus message payload: no data available.")
+	}
+	return message[MESSAGE_TYPE_BYTES:], nil
+}
+
+// Concatenate msgType as one byte with payload, and return the whole byte array
+func ConstructConsensusMessage(msgType MessageType, payload []byte) []byte {
+	byteBuffer := bytes.NewBuffer([]byte{byte(msgType)})
+	byteBuffer.Write(payload)
+	return byteBuffer.Bytes()
+}

deploy.sh

@@ -0,0 +1,6 @@
+./kill_node.sh
+ipfile=$1
+while read ip port mode; do 
+	echo $ip $port $mode $ipfile
+  go run ./benchmark_node.go -ip $ip -port $port -ipfile $ipfile&
+done < $ipfile

deploy_node.sh

@@ -1,8 +0,0 @@
-LEADER_PORT=3333
-SLAVE_START_PORT=3000
-SLAVE_END_PORT=3009
-for port in `seq $SLAVE_START_PORT $SLAVE_END_PORT`;
-do
-    go run ./benchmark_node.go -mode slave -port $port &
-done
-go run ./benchmark_node.go -mode leader -port $LEADER_PORT &

ipList.txt

@@ -0,0 +1,12 @@
+127.0.0.1 9000 leader
+127.0.0.1 9001 validator
+127.0.0.1 9002 validator
+127.0.0.1 9003 validator
+127.0.0.1 9004 validator
+127.0.0.1 9005 validator
+127.0.0.1 9006 validator
+127.0.0.1 9007 validator
+127.0.0.1 9008 validator
+127.0.0.1 9009 validator
+127.0.0.1 9010 validator
+127.0.0.1 9011 validator

kill_node.sh

@@ -1,4 +1,5 @@
-for pid in `/bin/ps -fu $USER| grep "slave.go\|slave -port\|leader" | grep -v "grep" | awk '{print $2}'`;
+for pid in `/bin/ps -fu $USER| grep "slave.go\|slave -port\|leader\|benchmark_node" | grep -v "grep" | awk '{print $2}'`;
 do
+    echo $pid
     kill -9 $pid
 done

node.go

@@ -85,7 +85,8 @@ func TxnGenerator(numOfTxns int, lenOfRandomString int) <-chan string {
 	go func() {
 		for i := 0; i < numOfTxns; i++ {
 			out <- randomString(lenOfRandomString)
-			time.Sleep(2 * time.Second)
+			fmt.Printf("Transaction Number %d\n", i)
+			//time.Sleep(2 * time.Second)
 		}
 		close(out)
 	}()
@@ -112,7 +113,7 @@ func main() {
 	Txns := BufferedTxnQueueWithFanOut(txnqueue, numOfNodes)
 	for num := range Txns {
 		txn := Txns[num]
-		go consume(txn,num)
+		go consume(txn, num)
 	}
 	time.Sleep(60 * time.Second)
 }

p2p/message.go

@@ -0,0 +1,84 @@
+package p2p
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/binary"
+	"io"
+	"log"
+	"net"
+)
+
+/*
+P2p Message data structure:
+
+---- message start -----
+1 byte            - message type
+		            0x00 - normal message (no need to forward)
+                    0x11 - p2p message (may need to forward to other neighbors)
+4 bytes           - message size n in number of bytes
+payload (n bytes) - actual message payload
+----  message end  -----
+
+*/
+
+// Read the message type and payload size, and return the actual payload.
+func ReadMessagePayload(conn net.Conn) ([]byte, error) {
+	var (
+		payloadBuf = bytes.NewBuffer([]byte{})
+		r          = bufio.NewReader(conn)
+	)
+
+	//// Read 1 byte for messge type
+	msgType, err := r.ReadByte()
+	if err != nil {
+		log.Fatalf("Error reading the p2p message type field")
+		return payloadBuf.Bytes(), err
+	}
+	log.Printf("Received p2p message with type: %x", msgType)
+	// TODO: check on msgType and take actions accordingly
+
+	//// Read 4 bytes for message size
+	fourBytes := make([]byte, 4)
+	n, err := r.Read(fourBytes)
+	if err != nil {
+		log.Fatalf("Error reading the p2p message size field")
+		return payloadBuf.Bytes(), err
+	} else if n < len(fourBytes) {
+		log.Fatalf("Failed reading the p2p message size field: only read %d bytes", n)
+		return payloadBuf.Bytes(), err
+	}
+
+	log.Print(fourBytes)
+	// Number of bytes for the message payload
+	bytesToRead := binary.BigEndian.Uint32(fourBytes)
+	log.Printf("The payload size is %d bytes.", bytesToRead)
+
+	//// Read the payload in chunk of 1024 bytes
+	tmpBuf := make([]byte, 1024)
+ILOOP:
+	for {
+		if bytesToRead < 1024 {
+			// Read the last number of bytes less than 1024
+			tmpBuf = make([]byte, bytesToRead)
+		}
+		n, err := r.Read(tmpBuf)
+		payloadBuf.Write(tmpBuf[:n])
+
+		switch err {
+		case io.EOF:
+			// TODO: should we return error here, or just ignore it?
+			log.Printf("EOF reached while reading p2p message")
+			break ILOOP
+		case nil:
+			bytesToRead -= uint32(n) // TODO: think about avoid the casting in every loop
+			if bytesToRead <= 0 {
+				break ILOOP
+			}
+		default:
+			log.Printf("Error reading p2p message")
+			return []byte{}, err
+		}
+	}
+	return payloadBuf.Bytes(), nil
+}

p2p/peer.go

@@ -0,0 +1,79 @@
+package p2p
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"log"
+	"net"
+	"strings"
+)
+
+// Object for a p2p peer (node)
+type Peer struct {
+	// Ip address of the peer
+	Ip string
+	// Port number of the peer
+	Port string
+	// Public key of the peer
+	PubKey string
+}
+
+// Send the message to the peer
+func SendMessage(peer Peer, msg []byte) {
+	// Construct normal p2p message
+	payload := ConstructP2pMessage(byte(0), msg)
+
+	send(peer.Ip, peer.Port, payload)
+}
+
+// Send the message to a list of peers
+func BroadcastMessage(peers []Peer, msg []byte) {
+	// Construct broadcast p2p message
+	payload := ConstructP2pMessage(byte(17), msg)
+
+	for _, peer := range peers {
+		send(peer.Ip, peer.Port, payload)
+	}
+}
+
+// Construct the p2p message as [messageType, payloadSize, payload]
+func ConstructP2pMessage(msgType byte, payload []byte) []byte {
+
+	firstByte := byte(17)        // messageType
+	sizeBytes := make([]byte, 4) // payloadSize
+
+	binary.BigEndian.PutUint32(sizeBytes, uint32(len(payload)))
+
+	byteBuffer := bytes.NewBuffer([]byte{})
+	byteBuffer.WriteByte(firstByte)
+	byteBuffer.Write(sizeBytes)
+	byteBuffer.Write(payload)
+	return byteBuffer.Bytes()
+}
+
+// SocketClient is to connect a socket given a port and send the given message.
+func sendWithSocketClient(ip, port string, message []byte) (res string) {
+	log.Printf("Sending message to ip %s and port %s\n", ip, port)
+	addr := strings.Join([]string{ip, port}, ":")
+	conn, err := net.Dial("tcp", addr)
+
+	if err != nil {
+		log.Fatalln(err)
+	}
+	defer conn.Close()
+
+	conn.Write(message)
+	log.Printf("Sent to ip %s and port %s: %s\n", ip, port, message)
+
+	// No ack (reply) message from the receiver for now.
+	// TODO: think about
+	return
+}
+
+// Send a message to another node with given port.
+func send(ip, port string, message []byte) (returnMessage string) {
+	returnMessage = sendWithSocketClient(ip, port, message)
+	fmt.Println(returnMessage)
+	return
+}

send_tnx.sh

@@ -1,4 +1,4 @@
-for port in `seq 0 9`;
+# the hex is basically    0,             0032,               4,    "9001 9002 9003 9004 9005 9006 9007 9008 9009 9010"
-do
+#        explanation:  type,   size(50 bytes), [START_CONSENSUS,    payload]
-    echo "3000 3001 3002 3003 3004 3005 3006 3007 3008 3009" | nc 127.0.0.1 3333
+#                                               START_CONSENSUS +   payload = 50 bytes
-done
+echo -e '\x00\x00\x00\x00\x32\x04\x39\x30\x30\x31\x20\x39\x30\x30\x32\x20\x39\x30\x30\x33\x20\x39\x30\x30\x34\x20\x39\x30\x30\x35\x20\x39\x30\x30\x36\x20\x39\x30\x30\x37\x20\x39\x30\x30\x38\x20\x39\x30\x30\x39\x20\x39\x30\x31\x30' | nc 127.0.0.1 9000