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obscuren 2013-12-26 12:45:52 +01:00
commit 5db3335dce
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.ethereum.go.un~ Normal file
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big.go Normal file
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package main
import (
"math/big"
)
func BigPow(a,b int) *big.Int {
c := new(big.Int)
c.Exp(big.NewInt(int64(a)), big.NewInt(int64(b)), big.NewInt(0))
return c
}
func Big(num string) *big.Int {
n := new(big.Int)
n.SetString(num, 0)
return n
}

21
block.go Normal file
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package main
import (
_"fmt"
)
type Block struct {
transactions []*Transaction
}
func NewBlock(/* TODO use raw data */transactions []*Transaction) *Block {
block := &Block{
// Slice of transactions to include in this block
transactions: transactions,
}
return block
}
func (block *Block) Update() {
}

55
block_manager.go Normal file
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// Blocks, blocks will have transactions.
// Transactions/contracts are updated in goroutines
// Each contract should send a message on a channel with usage statistics
// The statics can be used for fee calculation within the block update method
// Statistics{transaction, /* integers */ normal_ops, store_load, extro_balance, crypto, steps}
// The block updater will wait for all goroutines to be finished and update the block accordingly
// in one go and should use minimal IO overhead.
// The actual block updating will happen within a goroutine as well so normal operation may continue
package main
import (
_"fmt"
)
type BlockManager struct {
vm *Vm
}
func NewBlockManager() *BlockManager {
bm := &BlockManager{vm: NewVm()}
return bm
}
// Process a block.
func (bm *BlockManager) ProcessBlock(block *Block) error {
txCount := len(block.transactions)
lockChan := make(chan bool, txCount)
for _, tx := range block.transactions {
go bm.ProcessTransaction(tx, lockChan)
}
// Wait for all Tx to finish processing
for i := 0; i < txCount; i++ {
<- lockChan
}
return nil
}
func (bm *BlockManager) ProcessTransaction(tx *Transaction, lockChan chan bool) {
if tx.recipient == 0x0 {
bm.vm.RunTransaction(tx, func(opType OpType) bool {
// TODO calculate fees
return true // Continue
})
}
// Broadcast we're done
lockChan <- true
}

33
ethereum.go Normal file
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package main
import (
"fmt"
)
func main() {
InitFees()
bm := NewBlockManager()
tx := NewTransaction(0x0, 20, []string{
"SET 10 6",
"LD 10 10",
"LT 10 1 20",
"SET 255 7",
"JMPI 20 255",
"STOP",
"SET 30 200",
"LD 30 31",
"SET 255 22",
"JMPI 31 255",
"SET 255 15",
"JMP 255",
})
tx2 := NewTransaction(0x0, 20, []string{"SET 10 6", "LD 10 10"})
blck := NewBlock([]*Transaction{tx2, tx})
bm.ProcessBlock( blck )
fmt.Printf("rlp encoded Tx %q\n", tx.Serialize())
}

113
parsing.go Normal file
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package main
import (
"fmt"
"strings"
"errors"
"math/big"
"strconv"
)
// Op codes
var OpCodes = map[string]string{
"STOP": "0",
"ADD": "16", // 0x10
"SUB": "17", // 0x11
"MUL": "18", // 0x12
"DIV": "19", // 0x13
"SDIV": "20", // 0x14
"MOD": "21", // 0x15
"SMOD": "22", // 0x16
"EXP": "23", // 0x17
"NEG": "24", // 0x18
"LT": "32", // 0x20
"LE": "33", // 0x21
"GT": "34", // 0x22
"GE": "35", // 0x23
"EQ": "36", // 0x24
"NOT": "37", // 0x25
"SHA256": "48", // 0x30
"RIPEMD160": "49", // 0x31
"ECMUL": "50", // 0x32
"ECADD": "51", // 0x33
"SIGN": "52", // 0x34
"RECOVER": "53", // 0x35
"COPY": "64", // 0x40
"ST": "65", // 0x41
"LD": "66", // 0x42
"SET": "67", // 0x43
"JMP": "80", // 0x50
"JMPI": "81", // 0x51
"IND": "82", // 0x52
"EXTRO": "96", // 0x60
"BALANCE": "97", // 0x61
"MKTX": "112", // 0x70
"DATA": "128", // 0x80
"DATAN": "129", // 0x81
"MYADDRESS": "144", // 0x90
"BLKHASH": "145", // 0x91
"COINBASE": "146", // 0x92
"SUICIDE": "255", // 0xff
}
func CompileInstr(s string) (string, error) {
tokens := strings.Split(s, " ")
if OpCodes[tokens[0]] == "" {
return "", errors.New(fmt.Sprintf("OP not found: %s", tokens[0]))
}
code := OpCodes[tokens[0]] // Replace op codes with the proper numerical equivalent
op := new(big.Int)
op.SetString(code, 0)
args := make([]*big.Int, 6)
for i, val := range tokens[1:len(tokens)] {
num := new(big.Int)
num.SetString(val, 0)
args[i] = num
}
// Big int equation = op + x * 256 + y * 256**2 + z * 256**3 + a * 256**4 + b * 256**5 + c * 256**6
base := new(big.Int)
x := new(big.Int)
y := new(big.Int)
z := new(big.Int)
a := new(big.Int)
b := new(big.Int)
c := new(big.Int)
if args[0] != nil { x.Mul(args[0], big.NewInt(256)) }
if args[1] != nil { y.Mul(args[1], BigPow(256, 2)) }
if args[2] != nil { z.Mul(args[2], BigPow(256, 3)) }
if args[3] != nil { a.Mul(args[3], BigPow(256, 4)) }
if args[4] != nil { b.Mul(args[4], BigPow(256, 5)) }
if args[5] != nil { c.Mul(args[5], BigPow(256, 6)) }
base.Add(op, x)
base.Add(base, y)
base.Add(base, z)
base.Add(base, a)
base.Add(base, b)
base.Add(base, c)
return base.String(), nil
}
func Instr(instr string) (int, []string, error) {
base := new(big.Int)
base.SetString(instr, 0)
args := make([]string, 7)
for i := 0; i < 7; i++ {
// int(int(val) / int(math.Pow(256,float64(i)))) % 256
exp := BigPow(256, i)
num := new(big.Int)
num.Div(base, exp)
args[i] = num.Mod(num, big.NewInt(256)).String()
}
op, _ := strconv.Atoi(args[0])
return op, args[1:7], nil
}

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parsing_test.go Normal file
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package main
import (
"testing"
"math"
)
func TestCompile(t *testing.T) {
instr, err := CompileInstr("SET 10 1")
if err != nil {
t.Error("Failed compiling instruction")
}
calc := (67 + 10 * 256 + 1 * int64(math.Pow(256,2)))
if Big(instr).Int64() != calc {
t.Error("Expected", calc, ", got:", instr)
}
}
func TestValidInstr(t *testing.T) {
op, args, err := Instr("68163")
if err != nil {
t.Error("Error decoding instruction")
}
if op != oSET {
t.Error("Expected op to be 43, got:", op)
}
if args[0] != "10" {
t.Error("Expect args[0] to be 10, got:", args[0])
}
if args[1] != "1" {
t.Error("Expected args[1] to be 1, got:", args[1])
}
}
func TestInvalidInstr(t *testing.T) {
}

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serialization.go Normal file
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package main
import (
"math"
"bytes"
)
func ToBinary(x int, bytes int) string {
if bytes == 0 {
return ""
} else {
return ToBinary(int(x / 256), bytes - 1) + string(x % 256)
}
}
func NumToVarInt(x int) string {
if x < 253 {
return string(x)
} else if x < int(math.Pow(2,16)) {
return string(253) + ToBinary(x, 2)
} else if x < int(math.Pow(2,32)) {
return string(253) + ToBinary(x, 4)
} else {
return string(253) + ToBinary(x, 8)
}
}
func RlpEncode(object interface{}) string {
if str, ok := object.(string); ok {
return "\x00" + NumToVarInt(len(str)) + str
} else if slice, ok := object.([]interface{}); ok {
var buffer bytes.Buffer
for _, val := range slice {
if v, ok := val.(string); ok {
buffer.WriteString(RlpEncode(v))
} else {
buffer.WriteString(RlpEncode(val))
}
}
return "\x01" + RlpEncode(len(buffer.String())) + buffer.String()
} else if slice, ok := object.([]string); ok {
// FIXME this isn't dry. Fix this
var buffer bytes.Buffer
for _, val := range slice {
buffer.WriteString(RlpEncode(val))
}
return "\x01" + RlpEncode(len(buffer.String())) + buffer.String()
}
return ""
}
type RlpSerializer interface {
}

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serialization_test.go Normal file
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package main
import (
"testing"
"fmt"
)
func TestRlpEncode(t *testing.T) {
strRes := "\x00\x03dog"
str := RlpEncode("dog")
if str != strRes {
t.Error(fmt.Sprintf("Expected %q, got %q", strRes, str))
}
sliceRes := "\x01\x00\x03dog\x00\x03god\x00\x03cat"
slice := RlpEncode([]string{"dog", "god", "cat"})
if slice != sliceRes {
t.Error(fmt.Sprintf("Expected %q, got %q", sliceRes, slice))
}
}

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transaction.go Normal file
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package main
import (
"math/big"
"fmt"
"encoding/hex"
"crypto/sha256"
_ "bytes"
"strconv"
)
/*
Transaction Contract Size
-------------------------------------------
sender sender 20 bytes
recipient 0x0 20 bytes
value endowment 4 bytes (uint32)
fee fee 4 bytes (uint32)
d_size o_size 4 bytes (uint32)
data ops *
signature signature 64 bytes
*/
var StepFee *big.Int = new(big.Int)
var TxFee *big.Int = new(big.Int)
var MemFee *big.Int = new(big.Int)
var DataFee *big.Int = new(big.Int)
var CryptoFee *big.Int = new(big.Int)
var ExtroFee *big.Int = new(big.Int)
var Period1Reward *big.Int = new(big.Int)
var Period2Reward *big.Int = new(big.Int)
var Period3Reward *big.Int = new(big.Int)
var Period4Reward *big.Int = new(big.Int)
type Transaction struct {
sender string
recipient uint32
value uint32
fee uint32
data []string
memory []int
signature string
addr string
}
func NewTransaction(to uint32, value uint32, data []string) *Transaction {
tx := Transaction{sender: "1234567890", recipient: to, value: value}
tx.fee = 0//uint32((ContractFee + MemoryFee * float32(len(tx.data))) * 1e8)
// Serialize the data
tx.data = make([]string, len(data))
for i, val := range data {
instr, err := CompileInstr(val)
if err != nil {
fmt.Printf("compile error:%d %v", i+1, err)
}
tx.data[i] = instr
}
b:= []byte(tx.Serialize())
hash := sha256.Sum256(b)
tx.addr = hex.EncodeToString(hash[0:19])
return &tx
}
func Uitoa(i uint32) string {
return strconv.FormatUint(uint64(i), 10)
}
func (tx *Transaction) Serialize() string {
// Prepare the transaction for serialization
preEnc := []interface{}{
"0", // TODO last Tx
tx.sender,
// XXX In the future there's no need to cast to string because they'll end up being big numbers (strings)
Uitoa(tx.recipient),
Uitoa(tx.value),
Uitoa(tx.fee),
tx.data,
}
return RlpEncode(preEnc)
}
func InitFees() {
// Base for 2**60
b60 := new(big.Int)
b60.Exp(big.NewInt(2), big.NewInt(60), big.NewInt(0))
// Base for 2**80
b80 := new(big.Int)
b80.Exp(big.NewInt(2), big.NewInt(80), big.NewInt(0))
StepFee.Mul(b60, big.NewInt(4096))
//fmt.Println("StepFee:", StepFee)
TxFee.Mul(b60, big.NewInt(524288))
//fmt.Println("TxFee:", TxFee)
MemFee.Mul(b60, big.NewInt(262144))
//fmt.Println("MemFee:", MemFee)
DataFee.Mul(b60, big.NewInt(16384))
//fmt.Println("DataFee:", DataFee)
CryptoFee.Mul(b60, big.NewInt(65536))
//fmt.Println("CrytoFee:", CryptoFee)
ExtroFee.Mul(b60, big.NewInt(65536))
//fmt.Println("ExtroFee:", ExtroFee)
Period1Reward.Mul(b80, big.NewInt(1024))
//fmt.Println("Period1Reward:", Period1Reward)
Period2Reward.Mul(b80, big.NewInt(512))
//fmt.Println("Period2Reward:", Period2Reward)
Period3Reward.Mul(b80, big.NewInt(256))
//fmt.Println("Period3Reward:", Period3Reward)
Period4Reward.Mul(b80, big.NewInt(128))
//fmt.Println("Period4Reward:", Period4Reward)
}

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vm.go Normal file
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package main
import (
"math"
"math/big"
"fmt"
"strconv"
_ "encoding/hex"
)
// Op codes
const (
oSTOP int = 0x00
oADD int = 0x10
oSUB int = 0x11
oMUL int = 0x12
oDIV int = 0x13
oSDIV int = 0x14
oMOD int = 0x15
oSMOD int = 0x16
oEXP int = 0x17
oNEG int = 0x18
oLT int = 0x20
oLE int = 0x21
oGT int = 0x22
oGE int = 0x23
oEQ int = 0x24
oNOT int = 0x25
oSHA256 int = 0x30
oRIPEMD160 int = 0x31
oECMUL int = 0x32
oECADD int = 0x33
oSIGN int = 0x34
oRECOVER int = 0x35
oCOPY int = 0x40
oST int = 0x41
oLD int = 0x42
oSET int = 0x43
oJMP int = 0x50
oJMPI int = 0x51
oIND int = 0x52
oEXTRO int = 0x60
oBALANCE int = 0x61
oMKTX int = 0x70
oDATA int = 0x80
oDATAN int = 0x81
oMYADDRESS int = 0x90
oSUICIDE int = 0xff
)
type OpType int
const (
tNorm = iota
tData
tExtro
tCrypto
)
type TxCallback func(opType OpType) bool
type Vm struct {
// Memory stack
stack map[string]string
// Index ptr
iptr int
memory map[string]map[string]string
}
func NewVm() *Vm {
fmt.Println("init Ethereum VM")
stackSize := uint(256)
fmt.Println("stack size =", stackSize)
return &Vm{make(map[string]string), 0, make(map[string]map[string]string)}
}
func (vm *Vm) RunTransaction(tx *Transaction, cb TxCallback) {
fmt.Printf(`
# processing Tx (%v)
# fee = %f, ops = %d, sender = %s, value = %d
`, tx.addr, float32(tx.fee) / 1e8, len(tx.data), tx.sender, tx.value)
vm.stack = make(map[string]string)
vm.stack["0"] = tx.sender
vm.stack["1"] = "100" //int(tx.value)
vm.stack["1"] = "1000" //int(tx.fee)
//vm.memory[tx.addr] = make([]int, 256)
vm.memory[tx.addr] = make(map[string]string)
// Define instruction 'accessors' for the instruction, which makes it more readable
// also called register values, shorthanded as Rx/y/z. Memory address are shorthanded as Mx/y/z.
// Instructions are shorthanded as Ix/y/z
x := 0; y := 1; z := 2; //a := 3; b := 4; c := 5
out:
for vm.iptr < len(tx.data) {
// The base big int for all calculations. Use this for any results.
base := new(big.Int)
// XXX Should Instr return big int slice instead of string slice?
op, args, _ := Instr(tx.data[vm.iptr])
fmt.Printf("%-3d %d %v\n", vm.iptr, op, args)
opType := OpType(tNorm)
// Determine the op type (used for calculating fees by the block manager)
switch op {
case oEXTRO, oBALANCE:
opType = tExtro
case oSHA256, oRIPEMD160, oECMUL, oECADD: // TODO add rest
opType = tCrypto
}
// If the callback yielded a negative result abort execution
if !cb(opType) { break out }
nptr := vm.iptr
switch op {
case oSTOP:
fmt.Println("exiting (oSTOP), idx =", nptr)
break out
case oADD:
// (Rx + Ry) % 2 ** 256
base.Add(Big(vm.stack[args[ x ]]), Big(vm.stack[args[ y ]]))
base.Mod(base, big.NewInt(int64(math.Pow(2, 256))))
// Set the result to Rz
vm.stack[args[ z ]] = base.String()
case oSUB:
// (Rx - Ry) % 2 ** 256
base.Sub(Big(vm.stack[args[ x ]]), Big(vm.stack[args[ y ]]))
base.Mod(base, big.NewInt(int64(math.Pow(2, 256))))
// Set the result to Rz
vm.stack[args[ z ]] = base.String()
case oMUL:
// (Rx * Ry) % 2 ** 256
base.Mul(Big(vm.stack[args[ x ]]), Big(vm.stack[args[ y ]]))
base.Mod(base, big.NewInt(int64(math.Pow(2, 256))))
// Set the result to Rz
vm.stack[args[ z ]] = base.String()
case oDIV:
// floor(Rx / Ry)
base.Div(Big(vm.stack[args[ x ]]), Big(vm.stack[args[ y ]]))
// Set the result to Rz
vm.stack[args[ z ]] = base.String()
case oSET:
// Set the (numeric) value at Iy to Rx
vm.stack[args[ x ]] = args[ y ]
case oLD:
// Load the value at Mx to Ry
vm.stack[args[ y ]] = vm.memory[tx.addr][vm.stack[args[ x ]]]
case oLT:
cmp := Big(vm.stack[args[ x ]]).Cmp( Big(vm.stack[args[ y ]]) )
// Set the result as "boolean" value to Rz
if cmp < 0 { // a < b
vm.stack[args[ z ]] = "1"
} else {
vm.stack[args[ z ]] = "0"
}
case oJMP:
// Set the instruction pointer to the value at Rx
ptr, _ := strconv.Atoi( vm.stack[args[ x ]] )
nptr = ptr
case oJMPI:
// Set the instruction pointer to the value at Ry if Rx yields true
if vm.stack[args[ x ]] != "0" {
ptr, _ := strconv.Atoi( vm.stack[args[ y ]] )
nptr = ptr
}
default:
fmt.Println("Error op", op)
break
}
if vm.iptr == nptr {
vm.iptr++
} else {
vm.iptr = nptr
fmt.Println("... JMP", nptr, "...")
}
}
fmt.Println("# finished processing Tx\n")
}