234 lines
8.3 KiB
Go
234 lines
8.3 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package core
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import (
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"math/big"
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"runtime"
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"testing"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/pow"
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)
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// failPow is a non-validating proof of work implementation, that returns true
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// from Verify for all but one block.
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type failPow struct {
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failing uint64
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}
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func (pow failPow) Search(pow.Block, <-chan struct{}, int) (uint64, []byte) {
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return 0, nil
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}
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func (pow failPow) Verify(block pow.Block) bool { return block.NumberU64() != pow.failing }
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func (pow failPow) GetHashrate() int64 { return 0 }
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func (pow failPow) Turbo(bool) {}
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// delayedPow is a non-validating proof of work implementation, that returns true
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// from Verify for all blocks, but delays them the configured amount of time.
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type delayedPow struct {
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delay time.Duration
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}
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func (pow delayedPow) Search(pow.Block, <-chan struct{}, int) (uint64, []byte) {
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return 0, nil
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}
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func (pow delayedPow) Verify(block pow.Block) bool { time.Sleep(pow.delay); return true }
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func (pow delayedPow) GetHashrate() int64 { return 0 }
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func (pow delayedPow) Turbo(bool) {}
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// Tests that simple POW verification works, for both good and bad blocks.
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func TestPowVerification(t *testing.T) {
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// Create a simple chain to verify
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var (
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testdb, _ = ethdb.NewMemDatabase()
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genesis = GenesisBlockForTesting(testdb, common.Address{}, new(big.Int))
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blocks = GenerateChain(genesis, testdb, 8, nil)
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)
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headers := make([]*types.Header, len(blocks))
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for i, block := range blocks {
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headers[i] = block.Header()
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}
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// Run the POW checker for blocks one-by-one, checking for both valid and invalid nonces
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for i := 0; i < len(blocks); i++ {
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for j, full := range []bool{true, false} {
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for k, valid := range []bool{true, false} {
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var results <-chan nonceCheckResult
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switch {
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case full && valid:
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_, results = verifyNoncesFromBlocks(FakePow{}, []*types.Block{blocks[i]})
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case full && !valid:
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_, results = verifyNoncesFromBlocks(failPow{blocks[i].NumberU64()}, []*types.Block{blocks[i]})
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case !full && valid:
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_, results = verifyNoncesFromHeaders(FakePow{}, []*types.Header{headers[i]})
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case !full && !valid:
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_, results = verifyNoncesFromHeaders(failPow{headers[i].Number.Uint64()}, []*types.Header{headers[i]})
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}
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// Wait for the verification result
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select {
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case result := <-results:
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if result.index != 0 {
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t.Errorf("test %d.%d.%d: invalid index: have %d, want 0", i, j, k, result.index)
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}
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if result.valid != valid {
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t.Errorf("test %d.%d.%d: validity mismatch: have %v, want %v", i, j, k, result.valid, valid)
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}
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case <-time.After(time.Second):
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t.Fatalf("test %d.%d.%d: verification timeout", i, j, k)
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}
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// Make sure no more data is returned
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select {
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case result := <-results:
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t.Fatalf("test %d.%d.%d: unexpected result returned: %v", i, j, k, result)
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case <-time.After(25 * time.Millisecond):
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}
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}
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}
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}
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}
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// Tests that concurrent POW verification works, for both good and bad blocks.
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func TestPowConcurrentVerification2(t *testing.T) { testPowConcurrentVerification(t, 2) }
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func TestPowConcurrentVerification8(t *testing.T) { testPowConcurrentVerification(t, 8) }
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func TestPowConcurrentVerification32(t *testing.T) { testPowConcurrentVerification(t, 32) }
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func testPowConcurrentVerification(t *testing.T, threads int) {
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// Create a simple chain to verify
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var (
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testdb, _ = ethdb.NewMemDatabase()
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genesis = GenesisBlockForTesting(testdb, common.Address{}, new(big.Int))
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blocks = GenerateChain(genesis, testdb, 8, nil)
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)
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headers := make([]*types.Header, len(blocks))
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for i, block := range blocks {
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headers[i] = block.Header()
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}
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// Set the number of threads to verify on
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old := runtime.GOMAXPROCS(threads)
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defer runtime.GOMAXPROCS(old)
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// Run the POW checker for the entire block chain at once both for a valid and
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// also an invalid chain (enough if one is invalid, last but one (arbitrary)).
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for i, full := range []bool{true, false} {
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for j, valid := range []bool{true, false} {
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var results <-chan nonceCheckResult
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switch {
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case full && valid:
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_, results = verifyNoncesFromBlocks(FakePow{}, blocks)
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case full && !valid:
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_, results = verifyNoncesFromBlocks(failPow{uint64(len(blocks) - 1)}, blocks)
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case !full && valid:
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_, results = verifyNoncesFromHeaders(FakePow{}, headers)
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case !full && !valid:
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_, results = verifyNoncesFromHeaders(failPow{uint64(len(headers) - 1)}, headers)
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}
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// Wait for all the verification results
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checks := make(map[int]bool)
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for k := 0; k < len(blocks); k++ {
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select {
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case result := <-results:
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if _, ok := checks[result.index]; ok {
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t.Fatalf("test %d.%d.%d: duplicate results for %d", i, j, k, result.index)
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}
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if result.index < 0 || result.index >= len(blocks) {
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t.Fatalf("test %d.%d.%d: result %d out of bounds [%d, %d]", i, j, k, result.index, 0, len(blocks)-1)
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}
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checks[result.index] = result.valid
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case <-time.After(time.Second):
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t.Fatalf("test %d.%d.%d: verification timeout", i, j, k)
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}
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}
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// Check nonce check validity
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for k := 0; k < len(blocks); k++ {
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want := valid || (k != len(blocks)-2) // We chose the last but one nonce in the chain to fail
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if checks[k] != want {
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t.Errorf("test %d.%d.%d: validity mismatch: have %v, want %v", i, j, k, checks[k], want)
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}
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}
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// Make sure no more data is returned
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select {
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case result := <-results:
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t.Fatalf("test %d.%d: unexpected result returned: %v", i, j, result)
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case <-time.After(25 * time.Millisecond):
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}
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}
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}
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}
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// Tests that aborting a POW validation indeed prevents further checks from being
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// run, as well as checks that no left-over goroutines are leaked.
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func TestPowConcurrentAbortion2(t *testing.T) { testPowConcurrentAbortion(t, 2) }
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func TestPowConcurrentAbortion8(t *testing.T) { testPowConcurrentAbortion(t, 8) }
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func TestPowConcurrentAbortion32(t *testing.T) { testPowConcurrentAbortion(t, 32) }
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func testPowConcurrentAbortion(t *testing.T, threads int) {
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// Create a simple chain to verify
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var (
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testdb, _ = ethdb.NewMemDatabase()
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genesis = GenesisBlockForTesting(testdb, common.Address{}, new(big.Int))
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blocks = GenerateChain(genesis, testdb, 1024, nil)
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)
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headers := make([]*types.Header, len(blocks))
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for i, block := range blocks {
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headers[i] = block.Header()
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}
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// Set the number of threads to verify on
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old := runtime.GOMAXPROCS(threads)
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defer runtime.GOMAXPROCS(old)
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// Run the POW checker for the entire block chain at once
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for i, full := range []bool{true, false} {
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var abort chan<- struct{}
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var results <-chan nonceCheckResult
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// Start the verifications and immediately abort
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if full {
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abort, results = verifyNoncesFromBlocks(delayedPow{time.Millisecond}, blocks)
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} else {
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abort, results = verifyNoncesFromHeaders(delayedPow{time.Millisecond}, headers)
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}
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close(abort)
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// Deplete the results channel
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verified := make(map[int]struct{})
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for depleted := false; !depleted; {
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select {
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case result := <-results:
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verified[result.index] = struct{}{}
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case <-time.After(50 * time.Millisecond):
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depleted = true
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}
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}
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// Check that abortion was honored by not processing too many POWs
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if len(verified) > 2*threads {
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t.Errorf("test %d: verification count too large: have %d, want below %d", i, len(verified), 2*threads)
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}
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// Check that there are no gaps in the results
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for j := 0; j < len(verified); j++ {
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if _, ok := verified[j]; !ok {
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t.Errorf("test %d.%d: gap found in verification results", i, j)
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}
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}
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}
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}
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