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