finished basics of mining, added explore blocks

goodchain/src/helpers/TaskHelper.py

@@ -1,6 +1,11 @@
 from classes.Transaction import Tx
+from classes.TxBlock import TxBlock
 from helpers import SignatureHelper as signatureHelper
 from helpers import UtilityHelper as utilityHelper
+import time
+
+MIN_MINING_TIME = 0
+MAX_MINING_TIME = 20
 
 def transaction(self):
     receiver = input("Enter the username of the receiver:")
@@ -73,8 +78,110 @@ def createBlock(self):
         if int(i) not in available_transactions:
             print("Wrong input, try again")
             return False
-        fees_list.append(int(i))
+        selected_transactions.append(int(i))
+
+    if len(selected_transactions) > 10 and len(selected_transactions) < 5:
+        print("You can only select up to 10 transactions")
+        return False
+    # add last block if its available
+    block = TxBlock(None)
+
+    # create block
+    for i in selected_transactions:
+        block.addTx(transactions[i])
 
     
+    start = time.time()
+    nonce = block.find_nonce()
+    elapsed = time.time() - start
+
+    if not block.good_nonce():
+        print("ERROR! Bad nonce")
+        return False
+
+    print("Success! Nonce is good!")
+    print(f'Accepted Nonce = {str(nonce)}')
+
+    print("elapsed time: " + str(elapsed) + " s.")
+    if elapsed < MIN_MINING_TIME:
+        print("Mining declined, too fast")
+        return False
+    elif elapsed > MAX_MINING_TIME:
+        print("Mining declined, too Slow")
+        return False
+    
+    # add block to blockchain
+    block.time = elapsed
+    block.nonce = nonce
+    # TODO ADD DATE
+    block.date = None
+    utilityHelper.saveFile("../data/ledger.dat", block)
+    # TODO remove transactions from transaction pool
+
+    return True
 
     
+def exploreBlocks(self):
+    blocks = utilityHelper.loadFile("../data/ledger.dat")
+    x = 0
+    for block in blocks:
+        print(f"---------------------------------------{x}-------------------------------------------")
+        print(f"Block created: {block.date}")
+        x += 1
+    print("---------------------------------------END-------------------------------------------")
+    print("Select a number to view the block, keep empty to return.")
+    user_input = input(">>: ")
+    if user_input == "":
+        return
+
+    try:
+        user_input = int(user_input)
+    except:
+        utilityHelper.clearScreen()
+        print("Wrong input, try again")
+        return
+    
+    if user_input > len(blocks):
+        utilityHelper.clearScreen()
+        print("Wrong input, try again")
+        return
+    
+    # print all info of the block
+    utilityHelper.clearScreen()
+    print(f"---------------------------------------{user_input}-------------------------------------------")
+    print(f"Block created: {blocks[user_input].date}")
+    print(f"Block hash: {blocks[user_input].blockHash}")
+    print(f"Block nonce: {blocks[user_input].nonce}")
+    print(f"Block mined time: {blocks[user_input].time}")
+    # print(f"Block transactions: {blocks[user_input].transactions}")
+    print(f"Block previous hash: {blocks[user_input].previousHash}")
+    print("---------------------------------------------------------------------------------------")
+    print("0 -- go back")
+    print("1 -- View transactions of current block")
+    print("2 -- View another block")
+    choice = input(">>: ")
+    
+    match choice:
+        case "0":
+            utilityHelper.clearScreen()
+            return
+        case "1":
+            utilityHelper.clearScreen()
+            x = 0
+            for transaction in blocks[user_input].data:
+                print(f"---------------------------------------{x}-------------------------------------------")
+                print(f"Transaction input: {transaction.inputs[0][1]}")
+                print(f"Transaction output: {transaction.outputs[0][1]}")
+                print(f"Transaction fees: {transaction.inputs[0][1] - transaction.outputs[0][1]}")
+                print(f"Transaction sender: \n{transaction.inputs[0][0]}")
+                print(f"Transaction recipient: \n{transaction.outputs[0][0]}")
+                x += 1
+            print("-----------------------------------------------------------------------------------")
+        case "2":
+            utilityHelper.clearScreen()
+            exploreBlocks(self)
+        case _:
+            utilityHelper.clearScreen()
+            print("Wrong input, try again")
+            return
+