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package chain
import (
"fmt"
"math/big"
"testing"
"time"
"github.com/ethereum/go-ethereum/chain/types"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/ethutil"
"github.com/ethereum/go-ethereum/state"
)
var TD *big.Int
func init() {
ethutil.ReadConfig(".ethtest", "/tmp/ethtest", "")
ethutil.Config.Db, _ = ethdb.NewMemDatabase()
}
type fakeproc struct {
}
func (self fakeproc) ProcessWithParent(a, b *types.Block) (*big.Int, state.Messages, error) {
TD = new(big.Int).Add(TD, big.NewInt(1))
return TD, nil, nil
}
func makechain(cman *ChainManager, max int) *BlockChain {
blocks := make(types.Blocks, max)
for i := 0; i < max; i++ {
addr := ethutil.LeftPadBytes([]byte{byte(i)}, 20)
block := cman.NewBlock(addr)
if i != 0 {
cman.CurrentBlock = blocks[i-1]
}
blocks[i] = block
}
return NewChain(blocks)
}
func TestLongerFork(t *testing.T) {
cman := NewChainManager()
cman.SetProcessor(fakeproc{})
TD = big.NewInt(1)
chainA := makechain(cman, 5)
TD = big.NewInt(1)
chainB := makechain(cman, 10)
td, err := cman.TestChain(chainA)
if err != nil {
t.Error("unable to create new TD from chainA:", err)
}
cman.TD = td
_, err = cman.TestChain(chainB)
if err != nil {
t.Error("expected chainB not to give errors:", err)
}
}
func TestEqualFork(t *testing.T) {
cman := NewChainManager()
cman.SetProcessor(fakeproc{})
TD = big.NewInt(1)
chainA := makechain(cman, 5)
TD = big.NewInt(2)
chainB := makechain(cman, 5)
td, err := cman.TestChain(chainA)
if err != nil {
t.Error("unable to create new TD from chainA:", err)
}
cman.TD = td
_, err = cman.TestChain(chainB)
if err != nil {
t.Error("expected chainB not to give errors:", err)
}
}
func TestBrokenChain(t *testing.T) {
cman := NewChainManager()
cman.SetProcessor(fakeproc{})
TD = big.NewInt(1)
chain := makechain(cman, 5)
chain.Remove(chain.Front())
_, err := cman.TestChain(chain)
if err == nil {
t.Error("expected broken chain to return error")
}
}
func BenchmarkChainTesting(b *testing.B) {
const chainlen = 1000
ethutil.ReadConfig(".ethtest", "/tmp/ethtest", "")
ethutil.Config.Db, _ = ethdb.NewMemDatabase()
cman := NewChainManager()
cman.SetProcessor(fakeproc{})
TD = big.NewInt(1)
chain := makechain(cman, chainlen)
stime := time.Now()
cman.TestChain(chain)
fmt.Println(chainlen, "took", time.Since(stime))
}
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