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5.7 KiB

package vm
import (
"crypto/rand"
"encoding/hex"
"fmt"
"strings"
"testing"
"time"
. "github.com/tendermint/tendermint/common"
"github.com/tendermint/tendermint/events"
"github.com/tendermint/tendermint/types"
. "github.com/tendermint/tendermint/vm"
)
func newAppState() *FakeAppState {
return &FakeAppState{
accounts: make(map[string]*Account),
storage: make(map[string]Word256),
logs: nil,
}
}
func newParams() Params {
return Params{
BlockHeight: 0,
BlockHash: Zero256,
BlockTime: 0,
GasLimit: 0,
}
}
func makeBytes(n int) []byte {
b := make([]byte, n)
rand.Read(b)
return b
}
// Runs a basic loop
func TestVM(t *testing.T) {
ourVm := NewVM(newAppState(), newParams(), Zero256, nil)
// Create accounts
account1 := &Account{
Address: Int64ToWord256(100),
}
account2 := &Account{
Address: Int64ToWord256(101),
}
var gas int64 = 100000
N := []byte{0x0f, 0x0f}
// Loop N times
code := []byte{0x60, 0x00, 0x60, 0x20, 0x52, 0x5B, byte(0x60 + len(N) - 1)}
for i := 0; i < len(N); i++ {
code = append(code, N[i])
}
code = append(code, []byte{0x60, 0x20, 0x51, 0x12, 0x15, 0x60, byte(0x1b + len(N)), 0x57, 0x60, 0x01, 0x60, 0x20, 0x51, 0x01, 0x60, 0x20, 0x52, 0x60, 0x05, 0x56, 0x5B}...)
start := time.Now()
output, err := ourVm.Call(account1, account2, code, []byte{}, 0, &gas)
fmt.Printf("Output: %v Error: %v\n", output, err)
fmt.Println("Call took:", time.Since(start))
if err != nil {
t.Fatal(err)
}
}
// Tests the code for a subcurrency contract compiled by serpent
func TestSubcurrency(t *testing.T) {
st := newAppState()
// Create accounts
account1 := &Account{
Address: LeftPadWord256(makeBytes(20)),
}
account2 := &Account{
Address: LeftPadWord256(makeBytes(20)),
}
st.accounts[account1.Address.String()] = account1
st.accounts[account2.Address.String()] = account2
ourVm := NewVM(st, newParams(), Zero256, nil)
var gas int64 = 1000
code_parts := []string{"620f42403355",
"7c0100000000000000000000000000000000000000000000000000000000",
"600035046315cf268481141561004657",
"6004356040526040515460605260206060f35b63693200ce81141561008757",
"60043560805260243560a052335460c0523360e05260a05160c05112151561008657",
"60a05160c0510360e0515560a0516080515401608051555b5b505b6000f3"}
code, _ := hex.DecodeString(strings.Join(code_parts, ""))
fmt.Printf("Code: %x\n", code)
data, _ := hex.DecodeString("693200CE0000000000000000000000004B4363CDE27C2EB05E66357DB05BC5C88F850C1A0000000000000000000000000000000000000000000000000000000000000005")
output, err := ourVm.Call(account1, account2, code, data, 0, &gas)
fmt.Printf("Output: %v Error: %v\n", output, err)
if err != nil {
t.Fatal(err)
}
}
// Test sending tokens from a contract to another account
func TestSendCall(t *testing.T) {
fakeAppState := newAppState()
ourVm := NewVM(fakeAppState, newParams(), Zero256, nil)
// Create accounts
account1 := &Account{
Address: Int64ToWord256(100),
}
account2 := &Account{
Address: Int64ToWord256(101),
}
account3 := &Account{
Address: Int64ToWord256(102),
}
// account1 will call account2 which will trigger CALL opcode to account3
addr := account3.Address.Postfix(20)
contractCode := callContractCode(addr)
//----------------------------------------------
// account2 has insufficient balance, should fail
exception := runVMWaitEvents(t, ourVm, account1, account2, addr, contractCode, 1000)
if exception == "" {
t.Fatal("Expected exception")
}
//----------------------------------------------
// give account2 sufficient balance, should pass
account2.Balance = 100000
exception = runVMWaitEvents(t, ourVm, account1, account2, addr, contractCode, 1000)
if exception != "" {
t.Fatal("Unexpected exception", exception)
}
//----------------------------------------------
// insufficient gas, should fail
account2.Balance = 100000
exception = runVMWaitEvents(t, ourVm, account1, account2, addr, contractCode, 100)
if exception == "" {
t.Fatal("Expected exception")
}
}
// subscribes to an AccReceive, runs the vm, returns the exception
func runVMWaitEvents(t *testing.T, ourVm *VM, caller, callee *Account, subscribeAddr, contractCode []byte, gas int64) string {
// we need to catch the event from the CALL to check for exceptions
evsw := new(events.EventSwitch)
evsw.Start()
ch := make(chan interface{})
fmt.Printf("subscribe to %x\n", subscribeAddr)
evsw.AddListenerForEvent("test", types.EventStringAccReceive(subscribeAddr), func(msg interface{}) {
ch <- msg
})
evc := events.NewEventCache(evsw)
ourVm.SetFireable(evc)
go func() {
start := time.Now()
output, err := ourVm.Call(caller, callee, contractCode, []byte{}, 0, &gas)
fmt.Printf("Output: %v Error: %v\n", output, err)
fmt.Println("Call took:", time.Since(start))
if err != nil {
ch <- err.Error()
}
evc.Flush()
}()
msg := <-ch
switch ev := msg.(type) {
case types.EventMsgCallTx:
return ev.Exception
case types.EventMsgCall:
return ev.Exception
case string:
return ev
}
return ""
}
// this is code to call another contract (hardcoded as addr)
func callContractCode(addr []byte) []byte {
gas1, gas2 := byte(0x1), byte(0x1)
value := byte(0x69)
inOff, inSize := byte(0x0), byte(0x0) // no call data
retOff, retSize := byte(0x0), byte(0x20)
// this is the code we want to run (send funds to an account and return)
contractCode := []byte{0x60, retSize, 0x60, retOff, 0x60, inSize, 0x60, inOff, 0x60, value, 0x73}
contractCode = append(contractCode, addr...)
contractCode = append(contractCode, []byte{0x61, gas1, gas2, 0xf1, 0x60, 0x20, 0x60, 0x0, 0xf3}...)
return contractCode
}
/*
// infinite loop
code := []byte{0x5B, 0x60, 0x00, 0x56}
// mstore
code := []byte{0x60, 0x00, 0x60, 0x20}
// mstore, mload
code := []byte{0x60, 0x01, 0x60, 0x20, 0x52, 0x60, 0x20, 0x51}
*/