fake_app_state.go

// Copyright 2017 Monax Industries Limited
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package evm

import (
	"fmt"

	"bytes"

	"github.com/hyperledger/burrow/acm"
	"github.com/hyperledger/burrow/acm/acmstate"
	. "github.com/hyperledger/burrow/binary"
	"github.com/hyperledger/burrow/crypto"
)

type FakeAppState struct {
	accounts map[crypto.Address]*acm.Account
	storage  map[string]Word256
}

var _ acmstate.ReaderWriter = &FakeAppState{}

func (fas *FakeAppState) GetAccount(addr crypto.Address) (*acm.Account, error) {
	account := fas.accounts[addr]
	return account, nil
}

func (fas *FakeAppState) UpdateAccount(account *acm.Account) error {
	fas.accounts[account.GetAddress()] = account
	return nil
}

func (fas *FakeAppState) RemoveAccount(address crypto.Address) error {
	_, ok := fas.accounts[address]
	if !ok {
		panic(fmt.Sprintf("Invalid account addr: %s", address))
	} else {
		// Remove account
		delete(fas.accounts, address)
	}
	return nil
}

func (fas *FakeAppState) GetStorage(addr crypto.Address, key Word256) (Word256, error) {
	_, ok := fas.accounts[addr]
	if !ok {
		panic(fmt.Sprintf("Invalid account addr: %s", addr))
	}

	value, ok := fas.storage[addr.String()+key.String()]
	if ok {
		return value, nil
	} else {
		return Zero256, nil
	}
}

func (fas *FakeAppState) SetStorage(addr crypto.Address, key Word256, value Word256) error {
	_, ok := fas.accounts[addr]
	if !ok {

		fmt.Println("\n\n", fas.accountsDump())
		panic(fmt.Sprintf("Invalid account addr: %s", addr))
	}

	fas.storage[addr.String()+key.String()] = value
	return nil
}

func (fas *FakeAppState) accountsDump() string {
	buf := new(bytes.Buffer)
	fmt.Fprint(buf, "Dumping accounts...", "\n")
	for _, acc := range fas.accounts {
		fmt.Fprint(buf, acc.GetAddress().String(), "\n")
	}
	return buf.String()
}