Implement testnet specific rules.
This commit adds support for testnet specific rules when a new BlockChain is created against testnet.
This commit is contained in:
Dave Collins
parent
1deeb05627
commit
9787f46f6a
3 changed files with 88 additions and 16 deletions
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@ -114,7 +114,6 @@ intentionally causes an error by attempting to process a duplicate block.
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## TODO
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- Increase test coverage
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- Add testnet specific rules
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- Profile and optimize
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- Expose some APIs for block verification (without actually inserting it) and
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transaction input lookups
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@ -190,7 +190,17 @@ func (b *BlockChain) calcEasiestDifficulty(bits uint32, duration time.Duration)
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// Choose the correct proof of work limit for the active network.
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powLimit := b.netParams().powLimit
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// TODO(davec): Testnet has special rules.
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// The test network rules allow minimum difficulty blocks after more
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// than twice the desired amount of time needed to generate a block has
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// elapsed.
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switch b.btcnet {
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case btcwire.TestNet:
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fallthrough
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case btcwire.TestNet3:
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if durationVal > int64(targetSpacing)*2 {
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return BigToCompact(powLimit)
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}
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}
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// Since easier difficulty equates to higher numbers, the easiest
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// difficulty for a given duration is the largest value possible given
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@ -210,6 +220,36 @@ func (b *BlockChain) calcEasiestDifficulty(bits uint32, duration time.Duration)
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return BigToCompact(newTarget)
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}
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// findPrevTestNetDifficulty returns the difficulty of the previous block which
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// did not have the special testnet minimum difficulty rule applied.
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func (b *BlockChain) findPrevTestNetDifficulty(startNode *blockNode) (uint32, error) {
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// Search backwards through the chain for the last block without
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// the special rule applied.
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powLimitBits := BigToCompact(b.netParams().powLimit)
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iterNode := startNode
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for iterNode != nil && iterNode.height%blocksPerRetarget != 0 && iterNode.bits == powLimitBits {
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// Get the previous block node. This function is used over
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// simply accessing iterNode.parent directly as it will
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// dynamically create previous block nodes as needed. This
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// helps allow only the pieces of the chain that are needed
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// to remain in memory.
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var err error
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iterNode, err = b.getPrevNodeFromNode(iterNode)
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if err != nil {
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log.Errorf("getPrevNodeFromNode: %v", err)
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return 0, err
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}
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}
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// Return the found difficulty or the minimum difficulty if no
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// appropriate block was found.
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lastBits := powLimitBits
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if iterNode != nil {
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lastBits = iterNode.bits
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}
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return lastBits, nil
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}
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// calcNextRequiredDifficulty calculates the required difficulty for the block
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// after the passed previous block node based on the difficulty retarget rules.
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func (b *BlockChain) calcNextRequiredDifficulty(lastNode *blockNode, block *btcutil.Block) (uint32, error) {
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@ -224,8 +264,40 @@ func (b *BlockChain) calcNextRequiredDifficulty(lastNode *blockNode, block *btcu
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// Return the previous block's difficulty requirements if this block
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// is not at a difficulty retarget interval.
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if (lastNode.height+1)%blocksPerRetarget != 0 {
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// TODO(davec): Testnet has special rules.
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return lastNode.bits, nil
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// The difficulty rules differ between networks.
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switch b.btcnet {
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// The test network rules allow minimum difficulty blocks after
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// more than twice the desired amount of time needed to generate
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// a block has elapsed.
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case btcwire.TestNet:
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fallthrough
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case btcwire.TestNet3:
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// Return minimum difficulty when more than twice the
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// desired amount of time needed to generate a block has
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// elapsed.
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newBlockTime := block.MsgBlock().Header.Timestamp
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allowMinTime := lastNode.timestamp.Add(targetSpacing * 2)
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if newBlockTime.After(allowMinTime) {
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return BigToCompact(powLimit), nil
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}
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// The block was mined within the desired timeframe, so
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// return the difficulty for the last block which did
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// not have the special minimum difficulty rule applied.
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prevBits, err := b.findPrevTestNetDifficulty(lastNode)
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if err != nil {
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return 0, err
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}
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return prevBits, nil
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// For the main network (or any unrecognized networks), simply
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// return the previous block's difficulty.
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case btcwire.MainNet:
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fallthrough
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default:
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// Return the previous block's difficulty requirements.
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return lastNode.bits, nil
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}
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}
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// Get the block node at the previous retarget (targetTimespan days
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@ -2,33 +2,33 @@
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github.com/conformal/btcchain/chain.go BlockChain.removeOrphanBlock 100.00% (12/12)
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github.com/conformal/btcchain/chain.go BlockChain.getOrphanRoot 100.00% (7/7)
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github.com/conformal/btcchain/checkpoints.go init 100.00% (6/6)
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github.com/conformal/btcchain/difficulty.go ShaHashToBig 100.00% (5/5)
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github.com/conformal/btcchain/merkle.go hashMerkleBranches 100.00% (5/5)
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github.com/conformal/btcchain/merkle.go nextPowerOfTwo 100.00% (4/4)
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github.com/conformal/btcchain/difficulty.go ShaHashToBig 100.00% (5/5)
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github.com/conformal/btcchain/chain.go newBlockNode 100.00% (4/4)
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github.com/conformal/btcchain/merkle.go nextPowerOfTwo 100.00% (4/4)
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github.com/conformal/btcchain/difficulty.go calcWork 100.00% (3/3)
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github.com/conformal/btcchain/process.go BlockChain.blockExists 100.00% (3/3)
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github.com/conformal/btcchain/chain.go New 100.00% (2/2)
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github.com/conformal/btcchain/checkpoints.go newShaHashFromStr 100.00% (2/2)
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github.com/conformal/btcchain/timesorter.go timeSorter.Less 100.00% (1/1)
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github.com/conformal/btcchain/validate.go calcBlockSubsidy 100.00% (1/1)
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github.com/conformal/btcchain/timesorter.go timeSorter.Swap 100.00% (1/1)
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github.com/conformal/btcchain/checkpoints.go BlockChain.DisableCheckpoints 100.00% (1/1)
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github.com/conformal/btcchain/timesorter.go timeSorter.Less 100.00% (1/1)
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github.com/conformal/btcchain/timesorter.go timeSorter.Len 100.00% (1/1)
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github.com/conformal/btcchain/log.go init 100.00% (1/1)
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github.com/conformal/btcchain/log.go DisableLog 100.00% (1/1)
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github.com/conformal/btcchain/log.go init 100.00% (1/1)
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github.com/conformal/btcchain/merkle.go BuildMerkleTreeStore 94.12% (16/17)
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github.com/conformal/btcchain/chain.go BlockChain.getReorganizeNodes 92.86% (13/14)
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github.com/conformal/btcchain/process.go BlockChain.processOrphans 91.67% (11/12)
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github.com/conformal/btcchain/txlookup.go disconnectTransactions 90.91% (10/11)
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github.com/conformal/btcchain/txlookup.go BlockChain.fetchTxList 88.57% (31/35)
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github.com/conformal/btcchain/scriptval.go validateAllTxIn 87.88% (29/33)
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github.com/conformal/btcchain/chain.go BlockChain.calcPastMedianTime 87.50% (14/16)
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github.com/conformal/btcchain/scriptval.go checkBlockScripts 87.50% (7/8)
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github.com/conformal/btcchain/chain.go BlockChain.connectBestChain 86.96% (20/23)
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github.com/conformal/btcchain/validate.go countSigOps 86.67% (13/15)
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github.com/conformal/btcchain/chain.go BlockChain.connectBlock 83.33% (10/12)
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github.com/conformal/btcchain/validate.go isCoinBase 83.33% (5/6)
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github.com/conformal/btcchain/chain.go BlockChain.calcPastMedianTime 82.35% (14/17)
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github.com/conformal/btcchain/chain.go BlockChain.reorganizeChain 80.77% (21/26)
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github.com/conformal/btcchain/chain.go BlockChain.isMajorityVersion 80.00% (8/10)
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github.com/conformal/btcchain/txlookup.go BlockChain.fetchInputTransactions 78.26% (18/23)
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@ -51,17 +51,18 @@ github.com/conformal/btcchain/validate.go BlockChain.checkBIP0030 57.14% (8/1
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github.com/conformal/btcchain/chain.go BlockChain.loadBlockNode 50.00% (11/22)
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github.com/conformal/btcchain/checkpoints.go BlockChain.LatestCheckpoint 50.00% (2/4)
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github.com/conformal/btcchain/notifications.go BlockChain.sendNotification 50.00% (2/4)
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github.com/conformal/btcchain/accept.go BlockChain.maybeAcceptBlock 49.23% (32/65)
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github.com/conformal/btcchain/accept.go BlockChain.maybeAcceptBlock 46.38% (32/69)
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github.com/conformal/btcchain/chain.go BlockChain.getPrevNodeFromNode 33.33% (4/12)
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github.com/conformal/btcchain/checkpoints.go BlockChain.verifyCheckpoint 33.33% (2/6)
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github.com/conformal/btcchain/validate.go isFinalizedTransaction 23.08% (3/13)
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github.com/conformal/btcchain/checkpoints.go BlockChain.findLatestKnownCheckpoint 18.18% (2/11)
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github.com/conformal/btcchain/difficulty.go BlockChain.calcNextRequiredDifficulty 13.79% (4/29)
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github.com/conformal/btcchain/difficulty.go BlockChain.calcNextRequiredDifficulty 15.00% (6/40)
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github.com/conformal/btcchain/checkpoints.go BlockChain.IsCheckpointCandidate 0.00% (0/32)
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github.com/conformal/btcchain/validate.go countP2SHSigOps 0.00% (0/26)
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github.com/conformal/btcchain/difficulty.go BigToCompact 0.00% (0/16)
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github.com/conformal/btcchain/difficulty.go BlockChain.calcEasiestDifficulty 0.00% (0/14)
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github.com/conformal/btcchain/validate.go checkSerializedHeight 0.00% (0/12)
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github.com/conformal/btcchain/difficulty.go BlockChain.calcEasiestDifficulty 0.00% (0/10)
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github.com/conformal/btcchain/difficulty.go BlockChain.findPrevTestNetDifficulty 0.00% (0/12)
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github.com/conformal/btcchain/chain.go removeChildNode 0.00% (0/8)
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github.com/conformal/btcchain/log.go SetLogWriter 0.00% (0/7)
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github.com/conformal/btcchain/checkpoints.go isNonstandardTransaction 0.00% (0/5)
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@ -69,10 +70,10 @@ github.com/conformal/btcchain/checkpoints.go BlockChain.checkpointData 0.00%
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github.com/conformal/btcchain/validate.go isTransactionSpent 0.00% (0/4)
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github.com/conformal/btcchain/notifications.go NotificationType.String 0.00% (0/3)
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github.com/conformal/btcchain/chain.go addChildrenWork 0.00% (0/3)
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github.com/conformal/btcchain/log.go UseLogger 0.00% (0/1)
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github.com/conformal/btcchain/chain.go BlockChain.DisableVerify 0.00% (0/1)
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github.com/conformal/btcchain/process.go RuleError.Error 0.00% (0/1)
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github.com/conformal/btcchain/log.go newLogClosure 0.00% (0/1)
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github.com/conformal/btcchain/chain.go BlockChain.DisableVerify 0.00% (0/1)
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github.com/conformal/btcchain/log.go UseLogger 0.00% (0/1)
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github.com/conformal/btcchain/log.go logClosure.String 0.00% (0/1)
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github.com/conformal/btcchain ------------------------------------- 59.26% (576/972)
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github.com/conformal/btcchain/log.go newLogClosure 0.00% (0/1)
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github.com/conformal/btcchain ------------------------------------- 57.57% (578/1004)
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