added GetBlockchain in REST API of the serverCA, also added the visualization to the serverCA webapp

peer/blockchain.go

@@ -81,6 +81,11 @@ func (bc *Blockchain) addBlock(block Block) error {
 func reconstructBlockchainFromBlock(urlAPI string, h string) {
 	color.Yellow("reconstructing the blockchain from last block in memory")
 	var block Block
+	var err error
+
+	block, err = blockchain.getBlockByHash(h)
+	check(err)
+
 	if h == "" {
 		//no genesis block yet
 		color.Green(urlAPI + "/blocks/genesis")
@@ -97,16 +102,18 @@ func reconstructBlockchainFromBlock(urlAPI string, h string) {
 		block.NextHash = h
 	}
 
-	for block.NextHash != "" {
+	for block.NextHash != "" && block.Hash != "" {
 		res, err := http.Get(urlAPI + "/blocks/next/" + block.Hash)
 		check(err)
 		body, err := ioutil.ReadAll(res.Body)
 		check(err)
 		err = json.Unmarshal(body, &block)
 		check(err)
-		color.Yellow("[New Block]: " + block.Hash)
+		if block.Hash != "" {
-		err = blockchain.addBlock(block)
+			color.Yellow("[New Block]: " + block.Hash)
-		check(err)
+			err = blockchain.addBlock(block)
+			check(err)
+		}
 	}
 	blockchain.print()
 }

runTestPeers.sh

@@ -27,3 +27,10 @@ sleep 2
 
 echo "peer 3"
 xterm -hold -e './peer client 3007 3008' &
+
+sleep 1
+
+echo "running serverCA"
+cd ..
+cd serverCA
+xterm -hold -e 'go run *.go' &

serverCA/blockchain.go

@@ -0,0 +1,115 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"time"
+
+	"github.com/fatih/color"
+)
+
+type Block struct {
+	Hash         string    `json:"hash"`
+	Height       int64     `json:"height"`
+	Date         time.Time `json:"date"`
+	PreviousHash string    `json:"previoushash"`
+	NextHash     string    `json:"nexthash"`
+	Data         []Address `json:"data"`
+	Emitter      string    `json:"emitter"` //the ID of the peer that has emmited the block
+}
+
+type Blockchain struct {
+	GenesisBlock string    `json:"genesisblock"`
+	LastUpdate   time.Time `json:"lastupdate"`
+	Blocks       []Block   `json:"blocks"`
+}
+
+var blockchain Blockchain
+
+func (bc *Blockchain) getBlockByHash(hash string) (Block, error) {
+	for _, block := range bc.Blocks {
+		if block.Hash == hash {
+			return block, nil
+		}
+	}
+	var b Block
+	return b, errors.New("Block Hash not found")
+}
+
+func (bc *Blockchain) blockExists(block Block) bool {
+	for _, b := range bc.Blocks {
+		if b.Hash == block.Hash {
+			return true
+		}
+	}
+	return false
+}
+
+func (bc *Blockchain) addBlock(block Block) error {
+	if blockchain.blockExists(block) {
+		return errors.New("[Error adding Block]: Block already exists in the Blockchain")
+	}
+	if len(bc.Blocks) > 0 {
+		bc.Blocks[len(bc.Blocks)-1].NextHash = block.Hash
+	} else {
+		bc.GenesisBlock = block.Hash
+	}
+	bc.Blocks = append(bc.Blocks, block)
+
+	return nil
+}
+
+func reconstructBlockchainFromBlock(urlAPI string, h string) {
+	color.Yellow("reconstructing the blockchain from last block in memory")
+	var block Block
+	var err error
+
+	block, err = blockchain.getBlockByHash(h)
+	check(err)
+
+	if h == "" {
+		//no genesis block yet
+		color.Green(urlAPI + "/blocks/genesis")
+		res, err := http.Get(urlAPI + "/blocks/genesis")
+		check(err)
+		body, err := ioutil.ReadAll(res.Body)
+		check(err)
+		err = json.Unmarshal(body, &block)
+		check(err)
+		color.Yellow("[New Block]: " + block.Hash)
+		err = blockchain.addBlock(block)
+		check(err)
+	} else {
+		block.NextHash = h
+	}
+
+	for block.NextHash != "" && block.Hash != "" {
+		res, err := http.Get(urlAPI + "/blocks/next/" + block.Hash)
+		check(err)
+		body, err := ioutil.ReadAll(res.Body)
+		check(err)
+		err = json.Unmarshal(body, &block)
+		check(err)
+		if block.Hash != "" {
+			color.Yellow("[New Block]: " + block.Hash)
+			err = blockchain.addBlock(block)
+			check(err)
+		}
+	}
+	blockchain.print()
+}
+
+func (bc *Blockchain) print() {
+	color.Green("Printing Blockchain stored in memory")
+	color.Green("Genesis Block: " + bc.GenesisBlock)
+	for _, b := range bc.Blocks {
+		color.Green("Block height:")
+		fmt.Println(b.Height)
+		color.Green("Hash: " + b.Hash)
+		color.Green("Date: " + b.Date.String())
+		color.Green("---")
+	}
+}

serverCA/main.go

@@ -32,6 +32,8 @@ func main() {
 	//read configuration file
 	readConfig("config.json")
 
+	reconstructBlockchainFromBlock("http://"+config.IP+":"+config.ServerRESTPort, "")
+
 	//run thw webserver
 	go webserver()
 

serverCA/restRoutes.go

@@ -21,6 +21,12 @@ var routes = Routes{
 		"/peers",
 		GetPeers,
 	},
+	Route{
+		"GetBlockchain",
+		"GET",
+		"/blockchain",
+		GetBlockchain,
+	},
 }
 
 type Address struct {
@@ -37,3 +43,13 @@ func GetPeers(w http.ResponseWriter, r *http.Request) {
 	check(err)
 	fmt.Fprintln(w, string(jResp))
 }
+
+func GetBlockchain(w http.ResponseWriter, r *http.Request) {
+	fmt.Print("aaaaa: ")
+	fmt.Println(blockchain.Blocks[len(blockchain.Blocks)-1].Hash)
+	reconstructBlockchainFromBlock("http://"+config.IP+":"+config.ServerRESTPort, blockchain.Blocks[len(blockchain.Blocks)-1].Hash)
+
+	jResp, err := json.Marshal(blockchain)
+	check(err)
+	fmt.Fprintln(w, string(jResp))
+}

serverCA/webapp/views/main/main.html

@@ -1,16 +1,45 @@
 <div class="container">
     <div class="row">
-        <div class="col-md-3">
-        </div>
         <div class="col-md-6">
             <div class="card">
-                {{peerslist.PeerID}}
+                <div class="card-body">
-                <div class="card-body" style="max-height: 500px; overflow-y:scroll;">
+                    <h4 class="card-title">
-                    <div ng-repeat="peer in peerslist.peerslist">
+                        Peers
-                        <b>{{peer.id}}</b> - {{peer.role}}
+                    </h4>
-                        <br>
+                    {{peerslist.PeerID}}
-                        - {{peer.ip}}:{{peer.port}}, {{peer.restport}}
+                    <div style="max-height: 500px; overflow-y:scroll;">
-                        <hr>
+                        <div ng-repeat="peer in peerslist.peerslist">
+                            <b>{{peer.id}}</b> - {{peer.role}}
+                            <br>
+                            - {{peer.ip}}:{{peer.port}}, {{peer.restport}}
+                            <hr>
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+
+        <div class="col-md-6">
+            <div class="card">
+                <div class="card-body">
+                    <h4 class="card-title">
+                        Blockchain
+                    </h4>
+                    <div style="max-height: 500px; overflow-y:scroll;">
+                        <div ng-repeat="block in blockchain.blocks">
+                            Hash: <b>{{block.hash}}</b> - Height: {{block.height}}
+                            <br>
+                            Emitter: {{block.emitter}}
+                            <br>
+                            Date: {{block.date}}
+                            <br>
+                            Data: {{block.data}}
+                            <br>
+                            PreviousHash: {{block.previoushash}}
+                            <br>
+                            NextHash: {{block.nexthash}}
+                            <hr>
+                        </div>
                     </div>
                 </div>
             </div>

serverCA/webapp/views/main/main.js

@@ -19,4 +19,14 @@ angular.module('app.main', ['ngRoute'])
         }, function(data, status, headers, config) {
             console.log('data error');
         });
+
+        $scope.blockchain={};
+        $http.get(urlapi + 'blockchain')
+        .then(function(data, status, headers, config) {
+            console.log('data success');
+            console.log(data.data);
+            $scope.blockchain = data.data;
+        }, function(data, status, headers, config) {
+            console.log('data error');
+        });
     });