plugeth/tests/vm_test_util.go

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package tests
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import (
"bytes"
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"fmt"
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"io"
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"math/big"
"strconv"
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"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/logger/glog"
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)
func RunVmTestWithReader(r io.Reader, skipTests []string) error {
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tests := make(map[string]VmTest)
err := readJson(r, &tests)
if err != nil {
return err
}
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if err != nil {
return err
}
if err := runVmTests(tests, skipTests); err != nil {
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return err
}
return nil
}
func RunVmTest(p string, skipTests []string) error {
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tests := make(map[string]VmTest)
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err := readJsonFile(p, &tests)
if err != nil {
return err
}
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if err := runVmTests(tests, skipTests); err != nil {
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return err
}
return nil
}
func runVmTests(tests map[string]VmTest, skipTests []string) error {
skipTest := make(map[string]bool, len(skipTests))
for _, name := range skipTests {
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skipTest[name] = true
}
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for name, test := range tests {
if skipTest[name] {
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glog.Infoln("Skipping VM test", name)
return nil
}
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if err := runVmTest(test); err != nil {
return fmt.Errorf("%s %s", name, err.Error())
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}
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glog.Infoln("VM test passed: ", name)
//fmt.Println(string(statedb.Dump()))
}
return nil
}
func runVmTest(test VmTest) error {
db, _ := ethdb.NewMemDatabase()
statedb := state.New(common.Hash{}, db)
for addr, account := range test.Pre {
obj := StateObjectFromAccount(db, addr, account)
statedb.SetStateObject(obj)
for a, v := range account.Storage {
obj.SetState(common.HexToHash(a), common.HexToHash(v))
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}
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}
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// XXX Yeah, yeah...
env := make(map[string]string)
env["currentCoinbase"] = test.Env.CurrentCoinbase
env["currentDifficulty"] = test.Env.CurrentDifficulty
env["currentGasLimit"] = test.Env.CurrentGasLimit
env["currentNumber"] = test.Env.CurrentNumber
env["previousHash"] = test.Env.PreviousHash
if n, ok := test.Env.CurrentTimestamp.(float64); ok {
env["currentTimestamp"] = strconv.Itoa(int(n))
} else {
env["currentTimestamp"] = test.Env.CurrentTimestamp.(string)
}
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var (
ret []byte
gas *big.Int
err error
logs state.Logs
)
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ret, logs, gas, err = RunVm(statedb, env, test.Exec)
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// Compare expected and actual return
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rexp := common.FromHex(test.Out)
if bytes.Compare(rexp, ret) != 0 {
return fmt.Errorf("return failed. Expected %x, got %x\n", rexp, ret)
}
// Check gas usage
if len(test.Gas) == 0 && err == nil {
return fmt.Errorf("gas unspecified, indicating an error. VM returned (incorrectly) successfull")
} else {
gexp := common.Big(test.Gas)
if gexp.Cmp(gas) != 0 {
return fmt.Errorf("gas failed. Expected %v, got %v\n", gexp, gas)
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}
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}
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// check post state
for addr, account := range test.Post {
obj := statedb.GetStateObject(common.HexToAddress(addr))
if obj == nil {
continue
}
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for addr, value := range account.Storage {
v := obj.GetState(common.HexToHash(addr))
vexp := common.HexToHash(value)
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if v != vexp {
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return fmt.Errorf("(%x: %s) storage failed. Expected %x, got %x (%v %v)\n", obj.Address().Bytes()[0:4], addr, vexp, v, vexp.Big(), v.Big())
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}
}
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}
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// check logs
if len(test.Logs) > 0 {
lerr := checkLogs(test.Logs, logs)
if lerr != nil {
return lerr
}
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}
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return nil
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}
func RunVm(state *state.StateDB, env, exec map[string]string) ([]byte, state.Logs, *big.Int, error) {
var (
to = common.HexToAddress(exec["address"])
from = common.HexToAddress(exec["caller"])
data = common.FromHex(exec["data"])
gas = common.Big(exec["gas"])
price = common.Big(exec["gasPrice"])
value = common.Big(exec["value"])
)
// Reset the pre-compiled contracts for VM tests.
vm.Precompiled = make(map[string]*vm.PrecompiledAccount)
caller := state.GetOrNewStateObject(from)
vmenv := NewEnvFromMap(state, env, exec)
vmenv.vmTest = true
vmenv.skipTransfer = true
vmenv.initial = true
ret, err := vmenv.Call(caller, to, data, gas, price, value)
return ret, vmenv.state.Logs(), vmenv.Gas, err
}