path: root/core/vm/logger_test.go

// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package vm

import (
    "math/big"
    "testing"

    "github.com/ethereum/go-ethereum/common"
)

type dummyContractRef struct {
    calledForEach bool
}

func (dummyContractRef) ReturnGas(*big.Int, *big.Int) {}
func (dummyContractRef) Address() common.Address      { return common.Address{} }
func (dummyContractRef) Value() *big.Int              { return new(big.Int) }
func (dummyContractRef) SetCode(common.Hash, []byte)  {}
func (d *dummyContractRef) ForEachStorage(callback func(key, value common.Hash) bool) {
    d.calledForEach = true
}
func (d *dummyContractRef) SubBalance(amount *big.Int) {}
func (d *dummyContractRef) AddBalance(amount *big.Int) {}
func (d *dummyContractRef) SetBalance(*big.Int)        {}
func (d *dummyContractRef) SetNonce(uint64)            {}
func (d *dummyContractRef) Balance() *big.Int          { return new(big.Int) }

type dummyEnv struct {
    *Env
    ref *dummyContractRef
}

func newDummyEnv(ref *dummyContractRef) *dummyEnv {
    return &dummyEnv{
        Env: NewEnv(&Config{EnableJit: false, ForceJit: false}),
        ref: ref,
    }
}
func (d dummyEnv) GetAccount(common.Address) Account {
    return d.ref
}

func TestStoreCapture(t *testing.T) {
    var (
        env      = NewEnv(&Config{EnableJit: false, ForceJit: false})
        logger   = NewStructLogger(nil)
        mem      = NewMemory()
        stack    = newstack()
        contract = NewContract(&dummyContractRef{}, &dummyContractRef{}, new(big.Int), new(big.Int), new(big.Int))
    )
    stack.push(big.NewInt(1))
    stack.push(big.NewInt(0))

    var index common.Hash

    logger.CaptureState(env, 0, SSTORE, new(big.Int), new(big.Int), mem, stack, contract, 0, nil)
    if len(logger.changedValues[contract.Address()]) == 0 {
        t.Fatalf("expected exactly 1 changed value on address %x, got %d", contract.Address(), len(logger.changedValues[contract.Address()]))
    }

    exp := common.BigToHash(big.NewInt(1))
    if logger.changedValues[contract.Address()][index] != exp {
        t.Errorf("expected %x, got %x", exp, logger.changedValues[contract.Address()][index])
    }
}

func TestStorageCapture(t *testing.T) {
    t.Skip("implementing this function is difficult. it requires all sort of interfaces to be implemented which isn't trivial. The value (the actual test) isn't worth it")
    var (
        ref      = &dummyContractRef{}
        contract = NewContract(ref, ref, new(big.Int), new(big.Int), new(big.Int))
        env      = newDummyEnv(ref)
        logger   = NewStructLogger(nil)
        mem      = NewMemory()
        stack    = newstack()
    )

    logger.CaptureState(env, 0, STOP, new(big.Int), new(big.Int), mem, stack, contract, 0, nil)
    if ref.calledForEach {
        t.Error("didn't expect for each to be called")
    }

    logger = NewStructLogger(&LogConfig{FullStorage: true})
    logger.CaptureState(env, 0, STOP, new(big.Int), new(big.Int), mem, stack, contract, 0, nil)
    if !ref.calledForEach {
        t.Error("expected for each to be called")
    }
}