path: root/tests/vm_test_util.go

package tests

import (
    "bytes"
    "fmt"
    "io"
    "math/big"
    "strconv"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core/state"
    "github.com/ethereum/go-ethereum/core/vm"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/logger/glog"
)

func RunVmTestWithReader(r io.Reader) error {
    tests := make(map[string]VmTest)
    err := readJson(r, &tests)
    if err != nil {
        return err
    }

    if err != nil {
        return err
    }

    if err := runVmTests(tests); err != nil {
        return err
    }

    return nil
}

func RunVmTest(p string) error {

    tests := make(map[string]VmTest)
    err := readJsonFile(p, &tests)
    if err != nil {
        return err
    }

    if err := runVmTests(tests); err != nil {
        return err
    }

    return nil
}

func runVmTests(tests map[string]VmTest) error {
    skipTest := make(map[string]bool, len(VmSkipTests))
    for _, name := range VmSkipTests {
        skipTest[name] = true
    }

    for name, test := range tests {
        if skipTest[name] {
            glog.Infoln("Skipping VM test", name)
            return nil
        }

        if err := runVmTest(test); err != nil {
            return fmt.Errorf("%s %s", name, err.Error())
        }

        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))
        }
    }

    // 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)
    }

    var (
        ret  []byte
        gas  *big.Int
        err  error
        logs state.Logs
    )

    ret, logs, gas, err = RunVm(statedb, env, test.Exec)

    // Compare expectedand actual return
    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)
        }
    }

    // check post state
    for addr, account := range test.Post {
        obj := statedb.GetStateObject(common.HexToAddress(addr))
        if obj == nil {
            continue
        }

        for addr, value := range account.Storage {
            v := obj.GetState(common.HexToHash(addr))
            vexp := common.HexToHash(value)

            if v != vexp {
                return fmt.Errorf("(%x: %s) storage failed. Expected %x, got %x (%v %v)\n", obj.Address().Bytes()[0:4], addr, vexp, v, vexp.BigD(vexp), v.Big(v))
            }
        }
    }

    // check logs
    if len(test.Logs) > 0 {
        lerr := checkLogs(test.Logs, logs)
        if lerr != nil {
            return lerr
        }
    }

    return nil
}

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
}