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core: added future proc mutex lock

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Added a future lock which prevents the anything being added or removed
from or to the set when looping over the set of blocks. This fixes a nil
pointer in the range loop when trying to retrieve a block from the set
which was previously available but removed due to regular chain
processing.

Fixes #2305
This commit is contained in:
Jeffrey Wilcke 2016-03-08 15:55:27 +01:00
parent 8b58cd0190
commit 558d18d2b0
1 changed files with 15 additions and 14 deletions
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25
core/blockchain.go
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@ -85,10 +85,9 @@ type BlockChain struct {
eventMux *event.TypeMux
genesisBlock *types.Block
mu sync.RWMutex
chainmu sync.RWMutex
tsmu sync.RWMutex
procmu sync.RWMutex
mu sync.RWMutex // global mutex for locking chain operations
chainmu sync.RWMutex // blockchain insertion lock
procmu sync.RWMutex // block processor lock
checkpoint int // checkpoint counts towards the new checkpoint
currentBlock *types.Block // Current head of the block chain
@ -99,15 +98,15 @@ type BlockChain struct {
blockCache *lru.Cache // Cache for the most recent entire blocks
futureBlocks *lru.Cache // future blocks are blocks added for later processing
quit chan struct{}
quit chan struct{} // blockchain quit channel
running int32 // running must be called automically
// procInterrupt must be atomically called
procInterrupt int32 // interrupt signaler for block processing
wg sync.WaitGroup
wg sync.WaitGroup // chain processing wait group for shutting down
pow pow.PoW
processor Processor
validator Validator
processor Processor // block processor interface
validator Validator // block and state validator interface
}
// NewBlockChain returns a fully initialised block chain using information
@ -567,10 +566,11 @@ func (bc *BlockChain) Stop() {
}
func (self *BlockChain) procFutureBlocks() {
blocks := make([]*types.Block, self.futureBlocks.Len())
for i, hash := range self.futureBlocks.Keys() {
block, _ := self.futureBlocks.Get(hash)
blocks[i] = block.(*types.Block)
blocks := make([]*types.Block, 0, self.futureBlocks.Len())
for _, hash := range self.futureBlocks.Keys() {
if block, exist := self.futureBlocks.Get(hash); exist {
blocks = append(blocks, block.(*types.Block))
}
}
if len(blocks) > 0 {
types.BlockBy(types.Number).Sort(blocks)
@ -794,6 +794,7 @@ func (self *BlockChain) WriteBlock(block *types.Block) (status WriteStatus, err
if err := WriteBlock(self.chainDb, block); err != nil {
glog.Fatalf("filed to write block contents: %v", err)
}
self.futureBlocks.Remove(block.Hash())
return