Contract creation, updating and fee processing

block.go

@@ -1,7 +1,7 @@
 package main
 
 import (
-  _"fmt"
+  "fmt"
   "time"
   _"bytes"
   _"encoding/hex"
@@ -73,7 +73,8 @@ func CreateBlock(root string, num int, prevHash string, base string, difficulty
       contract := NewContract(tx.value, []byte(""))
       block.state.Update(string(addr), string(contract.MarshalRlp()))
       for i, val := range tx.data {
-        contract.state.Update(string(Encode(uint32(i))), val)
+        contract.state.Update(string(NumberToBytes(uint64(i), 32)), val)
+        //contract.state.Update(string(Encode(uint32(i))), val)
       }
       block.UpdateContract(addr, contract)
     }
@@ -84,6 +85,10 @@ func CreateBlock(root string, num int, prevHash string, base string, difficulty
 
 func (block *Block) GetContract(addr []byte) *Contract {
   data := block.state.Get(string(addr))
+  if data == "" {
+    return nil
+  }
+
   contract := &Contract{}
   contract.UnmarshalRlp([]byte(data))
 
@@ -94,7 +99,27 @@ func (block *Block) UpdateContract(addr []byte, contract *Contract) {
   block.state.Update(string(addr), string(contract.MarshalRlp()))
 }
 
-func (block *Block) Update() {
+
+func (block *Block) PayFee(addr []byte, fee uint64) bool {
+  contract := block.GetContract(addr)
+  // If we can't pay the fee return
+  if contract == nil || contract.amount < fee {
+    fmt.Println("Contract has insufficient funds", contract.amount, fee)
+    return false
+  }
+
+  contract.amount -= fee
+  block.state.Update(string(addr), string(contract.MarshalRlp()))
+
+  data := block.state.Get(string(block.coinbase))
+  println(data)
+  // Get the ether (coinbase) and add the fee (gief fee to miner)
+  ether := NewEtherFromData([]byte(data))
+  ether.amount += fee
+
+  block.state.Update(string(block.coinbase), string(ether.MarshalRlp()))
+
+  return true
 }
 
 // Returns a hash of the block