Exemple #1
0
// Execute is the main entry point for the command.  It's invoked by the parser.
func (cmd *blockRegionCmd) Execute(args []string) error {
	// Setup the global config options and ensure they are valid.
	if err := setupGlobalConfig(); err != nil {
		return err
	}

	// Ensure expected arguments.
	if len(args) < 1 {
		return errors.New("required block hash parameter not specified")
	}
	if len(args) < 2 {
		return errors.New("required start offset parameter not " +
			"specified")
	}
	if len(args) < 3 {
		return errors.New("required region length parameter not " +
			"specified")
	}

	// Parse arguments.
	blockHash, err := chainhash.NewHashFromStr(args[0])
	if err != nil {
		return err
	}
	startOffset, err := strconv.ParseUint(args[1], 10, 32)
	if err != nil {
		return err
	}
	regionLen, err := strconv.ParseUint(args[2], 10, 32)
	if err != nil {
		return err
	}

	// Load the block database.
	db, err := loadBlockDB()
	if err != nil {
		return err
	}
	defer db.Close()

	return db.View(func(tx database.Tx) error {
		log.Infof("Fetching block region %s<%d:%d>", blockHash,
			startOffset, startOffset+regionLen-1)
		region := database.BlockRegion{
			Hash:   blockHash,
			Offset: uint32(startOffset),
			Len:    uint32(regionLen),
		}
		startTime := time.Now()
		regionBytes, err := tx.FetchBlockRegion(&region)
		if err != nil {
			return err
		}
		log.Infof("Loaded block region in %v", time.Now().Sub(startTime))
		log.Infof("Double Hash: %s", chainhash.DoubleHashH(regionBytes))
		log.Infof("Region Hex: %s", hex.EncodeToString(regionBytes))
		return nil
	})
}
Exemple #2
0
// TxHash generates the Hash for the transaction.
func (msg *MsgTx) TxHash() chainhash.Hash {
	// Encode the transaction and calculate double sha256 on the result.
	// Ignore the error returns since the only way the encode could fail
	// is being out of memory or due to nil pointers, both of which would
	// cause a run-time panic.
	buf := bytes.NewBuffer(make([]byte, 0, msg.SerializeSize()))
	_ = msg.Serialize(buf)
	return chainhash.DoubleHashH(buf.Bytes())
}
Exemple #3
0
// HashMerkleBranches takes two hashes, treated as the left and right tree
// nodes, and returns the hash of their concatenation.  This is a helper
// function used to aid in the generation of a merkle tree.
func HashMerkleBranches(left *chainhash.Hash, right *chainhash.Hash) *chainhash.Hash {
	// Concatenate the left and right nodes.
	var hash [chainhash.HashSize * 2]byte
	copy(hash[:chainhash.HashSize], left[:])
	copy(hash[chainhash.HashSize:], right[:])

	newHash := chainhash.DoubleHashH(hash[:])
	return &newHash
}
Exemple #4
0
// BlockHash computes the block identifier hash for the given block header.
func (h *BlockHeader) BlockHash() chainhash.Hash {
	// Encode the header and double sha256 everything prior to the number of
	// transactions.  Ignore the error returns since there is no way the
	// encode could fail except being out of memory which would cause a
	// run-time panic.
	var buf bytes.Buffer
	_ = writeBlockHeader(&buf, 0, h)

	return chainhash.DoubleHashH(buf.Bytes())
}
Exemple #5
0
// BenchmarkDoubleHashH performs a benchmark on how long it takes to perform
// a double hash returning a chainhash.Hash.
func BenchmarkDoubleHashH(b *testing.B) {
	var buf bytes.Buffer
	if err := genesisCoinbaseTx.Serialize(&buf); err != nil {
		b.Errorf("Serialize: unexpected error: %v", err)
		return
	}
	txBytes := buf.Bytes()

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		_ = chainhash.DoubleHashH(txBytes)
	}
}
Exemple #6
0
// TestFullBlocks ensures all tests generated by the fullblocktests package
// have the expected result when processed via ProcessBlock.
func TestFullBlocks(t *testing.T) {
	tests, err := fullblocktests.Generate(false)
	if err != nil {
		t.Fatalf("failed to generate tests: %v", err)
	}

	// Create a new database and chain instance to run tests against.
	chain, teardownFunc, err := chainSetup("fullblocktest",
		&chaincfg.RegressionNetParams)
	if err != nil {
		t.Errorf("Failed to setup chain instance: %v", err)
		return
	}
	defer teardownFunc()

	// testAcceptedBlock attempts to process the block in the provided test
	// instance and ensures that it was accepted according to the flags
	// specified in the test.
	testAcceptedBlock := func(item fullblocktests.AcceptedBlock) {
		blockHeight := item.Height
		block := btcutil.NewBlock(item.Block)
		block.SetHeight(blockHeight)
		t.Logf("Testing block %s (hash %s, height %d)",
			item.Name, block.Hash(), blockHeight)

		isMainChain, isOrphan, err := chain.ProcessBlock(block,
			blockchain.BFNone)
		if err != nil {
			t.Fatalf("block %q (hash %s, height %d) should "+
				"have been accepted: %v", item.Name,
				block.Hash(), blockHeight, err)
		}

		// Ensure the main chain and orphan flags match the values
		// specified in the test.
		if isMainChain != item.IsMainChain {
			t.Fatalf("block %q (hash %s, height %d) unexpected main "+
				"chain flag -- got %v, want %v", item.Name,
				block.Hash(), blockHeight, isMainChain,
				item.IsMainChain)
		}
		if isOrphan != item.IsOrphan {
			t.Fatalf("block %q (hash %s, height %d) unexpected "+
				"orphan flag -- got %v, want %v", item.Name,
				block.Hash(), blockHeight, isOrphan,
				item.IsOrphan)
		}
	}

	// testRejectedBlock attempts to process the block in the provided test
	// instance and ensures that it was rejected with the reject code
	// specified in the test.
	testRejectedBlock := func(item fullblocktests.RejectedBlock) {
		blockHeight := item.Height
		block := btcutil.NewBlock(item.Block)
		block.SetHeight(blockHeight)
		t.Logf("Testing block %s (hash %s, height %d)",
			item.Name, block.Hash(), blockHeight)

		_, _, err := chain.ProcessBlock(block, blockchain.BFNone)
		if err == nil {
			t.Fatalf("block %q (hash %s, height %d) should not "+
				"have been accepted", item.Name, block.Hash(),
				blockHeight)
		}

		// Ensure the error code is of the expected type and the reject
		// code matches the value specified in the test instance.
		rerr, ok := err.(blockchain.RuleError)
		if !ok {
			t.Fatalf("block %q (hash %s, height %d) returned "+
				"unexpected error type -- got %T, want "+
				"blockchain.RuleError", item.Name, block.Hash(),
				blockHeight, err)
		}
		if rerr.ErrorCode != item.RejectCode {
			t.Fatalf("block %q (hash %s, height %d) does not have "+
				"expected reject code -- got %v, want %v",
				item.Name, block.Hash(), blockHeight,
				rerr.ErrorCode, item.RejectCode)
		}
	}

	// testRejectedNonCanonicalBlock attempts to decode the block in the
	// provided test instance and ensures that it failed to decode with a
	// message error.
	testRejectedNonCanonicalBlock := func(item fullblocktests.RejectedNonCanonicalBlock) {
		headerLen := len(item.RawBlock)
		if headerLen > 80 {
			headerLen = 80
		}
		blockHash := chainhash.DoubleHashH(item.RawBlock[0:headerLen])
		blockHeight := item.Height
		t.Logf("Testing block %s (hash %s, height %d)", item.Name,
			blockHash, blockHeight)

		// Ensure there is an error due to deserializing the block.
		var msgBlock wire.MsgBlock
		err := msgBlock.BtcDecode(bytes.NewReader(item.RawBlock), 0)
		if _, ok := err.(*wire.MessageError); !ok {
			t.Fatalf("block %q (hash %s, height %d) should have "+
				"failed to decode", item.Name, blockHash,
				blockHeight)
		}
	}

	// testOrphanOrRejectedBlock attempts to process the block in the
	// provided test instance and ensures that it was either accepted as an
	// orphan or rejected with a rule violation.
	testOrphanOrRejectedBlock := func(item fullblocktests.OrphanOrRejectedBlock) {
		blockHeight := item.Height
		block := btcutil.NewBlock(item.Block)
		block.SetHeight(blockHeight)
		t.Logf("Testing block %s (hash %s, height %d)",
			item.Name, block.Hash(), blockHeight)

		_, isOrphan, err := chain.ProcessBlock(block, blockchain.BFNone)
		if err != nil {
			// Ensure the error code is of the expected type.
			if _, ok := err.(blockchain.RuleError); !ok {
				t.Fatalf("block %q (hash %s, height %d) "+
					"returned unexpected error type -- "+
					"got %T, want blockchain.RuleError",
					item.Name, block.Hash(), blockHeight,
					err)
			}
		}

		if !isOrphan {
			t.Fatalf("block %q (hash %s, height %d) was accepted, "+
				"but is not considered an orphan", item.Name,
				block.Hash(), blockHeight)
		}
	}

	// testExpectedTip ensures the current tip of the blockchain is the
	// block specified in the provided test instance.
	testExpectedTip := func(item fullblocktests.ExpectedTip) {
		blockHeight := item.Height
		block := btcutil.NewBlock(item.Block)
		block.SetHeight(blockHeight)
		t.Logf("Testing tip for block %s (hash %s, height %d)",
			item.Name, block.Hash(), blockHeight)

		// Ensure hash and height match.
		best := chain.BestSnapshot()
		if *best.Hash != item.Block.BlockHash() ||
			best.Height != blockHeight {

			t.Fatalf("block %q (hash %s, height %d) should be "+
				"the current tip -- got (hash %s, height %d)",
				item.Name, block.Hash(), blockHeight, best.Hash,
				best.Height)
		}
	}

	for testNum, test := range tests {
		for itemNum, item := range test {
			switch item := item.(type) {
			case fullblocktests.AcceptedBlock:
				testAcceptedBlock(item)
			case fullblocktests.RejectedBlock:
				testRejectedBlock(item)
			case fullblocktests.RejectedNonCanonicalBlock:
				testRejectedNonCanonicalBlock(item)
			case fullblocktests.OrphanOrRejectedBlock:
				testOrphanOrRejectedBlock(item)
			case fullblocktests.ExpectedTip:
				testExpectedTip(item)
			default:
				t.Fatalf("test #%d, item #%d is not one of "+
					"the supported test instance types -- "+
					"got type: %T", testNum, itemNum, item)
			}
		}
	}
}