Blockchain Simulator

Server Getting Start

1. Activate venv. $ source server/myvenv/bin/activate
2. At __init__ in connection_manager.py, choose how many peers to connect.

class ConnectionManager:
    def __init__(self, host, port, callback):
        self.host = host
        self.port = port
        self.mm = MessageManager()
        self.callback = callback
        self.peers = set()
        
        # connect to 2 peers
        self.peers = [(host, 65001), (host, 65002)]
        # connect to 3 peers
        # self.peers = [(host, 65001), (host, 65002), (host, 65003)]

3. Start node server. $ python node1_server.py
   • There are node1_server.py, node2_server.py, and node3_server.py
   • Each node's port is 50082, 50083, and 50084
4. Send HTTP GET start for every nodes
5. You can send any APIs 🎉

登場人物

• node: node1, node2, node3
• account: aki, so, satoshi
• controller

Genesis block

The genesis block has these three transactions.

[ {"sender": None, "recipient": "aki", "value": 2},
  {"sender": None, "recipient": "so", "value": 7},
  {"sender": None, "recipient": "satoshi", "value": 5} ]

API (controllers - nodes)

• https://$node-simulator-host:$port/$api
  • eg.) curl -X GET http://localhost:10001/status

HTTP GET

start

• activate node
• need to be used every time you start the program

reset

• reset state
• clock is 0, tx pool is empty, and chain contains the Genesis block only.

status

• return status in JSON
• return value

{
	"clock": 1,
	"status": "idle"
}

• status type
  • 1: idle
  • 2: mining
  • 3: broadcasting-block
  • 4: broadcasting-tx
  • 5: receiving-block
  • 6: receiving-tx

block

block value

{
	"id": 4,
	"hash": "5234ab...",
	"timestamp": "%Y/%m/%d %H:%M:%S",
	"transactions": [{"sender": "aki", "recipient": "so", "value": 3}],
	"previoud_block_hash": "d628e...",
	"nonde": 46
}

block/latest

• return a block for the given id in the node in JSON
• return block value

block/$blockid

• return the latest block in the node in JSON
• return HTTP 200 with the block value, if it exists
• return HTTP 404, if not

block/all

• return all blocks in the node in JSON
• return value

{
	"length": 2,
	"blocks": [
			{ "id": 0, "hash: ..." },
			{ "id": 1, "hash: ..." }
		]
}

txPool/all

• return all transactions in the tx pool of the node in JSON
• return value

{
	"sender": "aki",
	"recipient": "so",
	"value": 3
}

mine

• request the node to mine
  • at the next clock, the status of the node becomes “mining”
• return HTTP 200, no body

clock/$clock

• changes clock to the given value
• return HTTP 200, no body

HTTP POST

tx/add

• request to add a transaction to the tx pool
• POST data: tx value
• return value

{
	"result": "success"	// success | fail
}

clockの消費

• mining: 3
• broadcasting-block: 1
• broadcasting-transaction: 1
• receiving-block: 1
• receiving-transaction: 1
• respond to controller: 0

初期状態

node

• socketで繋がっている
• blockchainにはgenesis blockが入っている
• tx poolは空

account

• akiに10コイン(genesis blockにtxが入っている)

node内でのmessage type

• NEW_BLOCK
• NEW_TX