P2PNetworkInJava/broker_node.java at master · haileykim1/P2PNetworkInJava · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Iterator;


public class broker_node extends Thread implements Serializable{

	static node_info node_storage;
	static int my_port;
	static BlockChain chain;
	ServerSocket serverSocket;
	Socket socket;
	ObjectInputStream oin;
	ObjectOutputStream oout;
	static String consortiumName = "";
	static ServerThread serverThread;
	int cnt = 0;

	public void run(){
		System.out.println("Broker Node start...");


		try {


			while(true) {
				serverSocket = new ServerSocket(my_port);
				socket = serverSocket.accept();
				oin = new ObjectInputStream(socket.getInputStream());
				oout = new ObjectOutputStream(socket.getOutputStream());

				//Message format
				//enrol : MemberInfo
				//enrolConsortium : ConsotriumInfo
				//Transaction : type#sender_node_id#receiver_node_id#price
				//BLOCK : Block
				//DELETE : type#sender -> String


				//object���엯 �냼耳� �넻�떊
				Object data = oin.readObject();

				if(data instanceof MemberInfo) {
					System.out.println("Object : Member Enrollment");
					boolean flag = node_storage.enrol((MemberInfo)data);
					oout.writeObject(flag);
				}
				else if(data instanceof Block) {
					System.out.println("Object : Block");
					//Blockchain�뿉 �벑濡�

					oout.writeObject(chain.addBlock((Block)data));
				}


				else if(data instanceof TransactionInfo) {
					System.out.println("Object : TransactionInfo");

					//inner
					//public key瑜� 媛��졇�삤硫� Transaction�쓣 �깮�꽦�븯怨�
					TransactionInfo info = (TransactionInfo) data;


					serverThread.sendMessage(info);

					//inner transaction
					MemberInfo receiver;
					if((node_storage.select(info.getRcvId())) != null) {
						receiver = node_storage.node_list.get(info.getRcvId());
						Transaction tr = receiver.getWallet().sendFunds(receiver.getWallet().publicKey, info.getFundValue());
						chain.queue.get(chain.queuePos).addTransaction(tr);
						System.out.println("Transaction succeed");
						oout.writeObject(true);
					}

				}

				else if(data instanceof Transaction) {
					System.out.println("Object : Transaction");
					NetworkEndPoint i = new NetworkEndPoint();
					Transaction tr = (Transaction) data;
					String receive_node = node_storage.select(tr.recipient_id);
					if(tr.processTransaction() == false) {
						System.err.println("Broker Node : Error : transaction can not verify");
						oout.writeObject(false);
					}
					else {

						serverThread.sendMessage(tr);
						oout.writeObject(true);
					}
				}
				else if(data instanceof String) {
					String str = (String)data;
					if(data.equals("HASH")) {
						System.out.println("Membernode needs prevHash value");
						oout.writeObject(chain.getPreviousHash());
					}else if(data.equals("ID")) {
						System.out.println("Membernode needs ID value");
						oout.writeObject((String)(consortiumName + (++cnt)));
					}else if(data.equals("BLOCK")) {
						//占쏙옙占쏙옙占� 占싹쇽옙占실몌옙 占쏙옙占쏙옙 占쌍깍옙
						if(chain.blockchain.size() == 1) {
							Block block = new Block(chain.getPreviousHash());
							oout.writeObject(block);
						}
						else if(chain.queue.get(chain.queuePos).add_transaction_num == 4) {
							Block block = new Block(chain.getPreviousHash());
							block.transactions = chain.queue.get(chain.queuePos).transactions;
							block.hash = block.calculateHash();
							block.add_transaction_num = 4;

							oout.writeObject(block);
							chain.queuePos++;
						} else {
							oout.writeObject(false);
						}
					}
					else {

						System.out.println("Object : String -> DELETE");
						node_storage.delete((String)data);
					}
				}

				else {
					System.out.println("Received Object Unknown");
				}


				oout.close();
				oin.close();
				socket.close();
				serverSocket.close();
			}


		} catch(Exception e) {
			e.printStackTrace();
		}
	}

	//broker_node瑜� �깮�꽦�뻽�쓣 �븣遺��꽣 local message ��湲�
	broker_node(node_info node_storage, int my_port, BlockChain chain, String name) {
		this.node_storage = node_storage;
		this.my_port = my_port;
		this.chain = chain;
		this.consortiumName = name;
		this.start();
	}

	@Override
	protected void finalize() throws Throwable{
	}


}