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-rw-r--r--consensus/errors.go41
-rw-r--r--consensus/ethash/consensus.go37
2 files changed, 57 insertions, 21 deletions
diff --git a/consensus/errors.go b/consensus/errors.go
new file mode 100644
index 000000000..f94bcb329
--- /dev/null
+++ b/consensus/errors.go
@@ -0,0 +1,41 @@
+// Copyright 2017 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 consensus
+
+import "errors"
+
+var (
+ // ErrUnknownAncestor is returned when validating a block requires an ancestor
+ // that is unknown.
+ ErrUnknownAncestor = errors.New("unknown ancestor")
+
+ // ErrLargeBlockTime is returned if the value of the timestamp is beyond
+ // any reasonable value.
+ ErrLargeBlockTime = errors.New("timestamp too big")
+
+ // ErrZeroBlockTime is returned if the block's timestamp is the same as the one
+ // its parent has.
+ ErrZeroBlockTime = errors.New("timestamp equals parent's")
+
+ // ErrFutureBlock is returned when a block's timestamp is in the future according
+ // to the current node.
+ ErrFutureBlock = errors.New("block in the future")
+
+ // ErrInvalidNumber is returned if a block's number doesn't equal it's parent's
+ // plus one.
+ ErrInvalidNumber = errors.New("invalid block number")
+)
diff --git a/consensus/ethash/consensus.go b/consensus/ethash/consensus.go
index 603be3e53..4a3a74a93 100644
--- a/consensus/ethash/consensus.go
+++ b/consensus/ethash/consensus.go
@@ -42,20 +42,15 @@ var (
)
var (
- ErrInvalidChain = errors.New("invalid header chain")
- ErrParentUnknown = errors.New("parent not known locally")
- ErrFutureBlock = errors.New("block in the future")
- ErrLargeBlockTimestamp = errors.New("timestamp too big")
- ErrZeroBlockTime = errors.New("timestamp equals parent's")
- ErrInvalidNumber = errors.New("invalid block number")
- ErrTooManyUncles = errors.New("too many uncles")
- ErrDuplicateUncle = errors.New("duplicate uncle")
- ErrUncleIsAncestor = errors.New("uncle is ancestor")
- ErrDanglingUncle = errors.New("uncle's parent is not ancestor")
- ErrNonceOutOfRange = errors.New("nonce out of range")
- ErrInvalidDifficulty = errors.New("non-positive difficulty")
- ErrInvalidMixDigest = errors.New("invalid mix digest")
- ErrInvalidPoW = errors.New("invalid proof-of-work")
+ ErrInvalidChain = errors.New("invalid header chain")
+ ErrTooManyUncles = errors.New("too many uncles")
+ ErrDuplicateUncle = errors.New("duplicate uncle")
+ ErrUncleIsAncestor = errors.New("uncle is ancestor")
+ ErrDanglingUncle = errors.New("uncle's parent is not ancestor")
+ ErrNonceOutOfRange = errors.New("nonce out of range")
+ ErrInvalidDifficulty = errors.New("non-positive difficulty")
+ ErrInvalidMixDigest = errors.New("invalid mix digest")
+ ErrInvalidPoW = errors.New("invalid proof-of-work")
)
// VerifyHeader checks whether a header conforms to the consensus rules of the
@@ -72,7 +67,7 @@ func (ethash *Ethash) VerifyHeader(chain consensus.ChainReader, header *types.He
}
parent := chain.GetHeader(header.ParentHash, number-1)
if parent == nil {
- return ErrParentUnknown
+ return consensus.ErrUnknownAncestor
}
// Sanity checks passed, do a proper verification
return ethash.verifyHeader(chain, header, parent, false, seal)
@@ -125,7 +120,7 @@ func (ethash *Ethash) VerifyHeaders(chain consensus.ChainReader, headers []*type
case chain.GetHeader(headers[index].Hash(), headers[index].Number.Uint64()-1) != nil:
outputs <- result{index: index, err: nil}
case parent == nil:
- failure = ErrParentUnknown
+ failure = consensus.ErrUnknownAncestor
outputs <- result{index: index, err: failure}
default:
failure = ethash.verifyHeader(chain, headers[index], parent, false, seals[index])
@@ -254,15 +249,15 @@ func (ethash *Ethash) verifyHeader(chain consensus.ChainReader, header, parent *
// Verify the header's timestamp
if uncle {
if header.Time.Cmp(math.MaxBig256) > 0 {
- return ErrLargeBlockTimestamp
+ return consensus.ErrLargeBlockTime
}
} else {
if header.Time.Cmp(big.NewInt(time.Now().Unix())) > 0 {
- return ErrFutureBlock
+ return consensus.ErrFutureBlock
}
}
if header.Time.Cmp(parent.Time) <= 0 {
- return ErrZeroBlockTime
+ return consensus.ErrZeroBlockTime
}
// Verify the block's difficulty based in it's timestamp and parent's difficulty
expected := CalcDifficulty(chain.Config(), header.Time.Uint64(), parent.Time.Uint64(), parent.Number, parent.Difficulty)
@@ -282,7 +277,7 @@ func (ethash *Ethash) verifyHeader(chain consensus.ChainReader, header, parent *
}
// Verify that the block number is parent's +1
if diff := new(big.Int).Sub(header.Number, parent.Number); diff.Cmp(big.NewInt(1)) != 0 {
- return ErrInvalidNumber
+ return consensus.ErrInvalidNumber
}
// Verify the engine specific seal securing the block
if seal {
@@ -449,7 +444,7 @@ func (ethash *Ethash) VerifySeal(chain consensus.ChainReader, header *types.Head
func (ethash *Ethash) Prepare(chain consensus.ChainReader, header *types.Header) error {
parent := chain.GetHeader(header.ParentHash, header.Number.Uint64()-1)
if parent == nil {
- return ErrParentUnknown
+ return consensus.ErrUnknownAncestor
}
header.Difficulty = CalcDifficulty(chain.Config(), header.Time.Uint64(),
parent.Time.Uint64(), parent.Number, parent.Difficulty)