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package eth
import (
"math"
"math/big"
"sync"
"github.com/ethereum/eth-go/ethchain"
"github.com/ethereum/eth-go/ethutil"
)
type block struct {
peer *Peer
block *ethchain.Block
}
type BlockPool struct {
mut sync.Mutex
eth *Ethereum
hashPool [][]byte
pool map[string]*block
td *big.Int
}
func NewBlockPool(eth *Ethereum) *BlockPool {
return &BlockPool{
eth: eth,
pool: make(map[string]*block),
td: ethutil.Big0,
}
}
func (self *BlockPool) HasLatestHash() bool {
return self.pool[string(self.eth.BlockChain().CurrentBlock.Hash())] != nil
}
func (self *BlockPool) HasCommonHash(hash []byte) bool {
return self.eth.BlockChain().GetBlock(hash) != nil
}
func (self *BlockPool) AddHash(hash []byte) {
if self.pool[string(hash)] == nil {
self.pool[string(hash)] = &block{nil, nil}
self.hashPool = append([][]byte{hash}, self.hashPool...)
}
}
func (self *BlockPool) SetBlock(b *ethchain.Block, peer *Peer) {
hash := string(b.Hash())
if self.pool[hash] == nil {
self.pool[hash] = &block{peer, nil}
}
self.pool[hash].block = b
}
func (self *BlockPool) CheckLinkAndProcess(f func(block *ethchain.Block)) bool {
self.mut.Lock()
defer self.mut.Unlock()
if self.IsLinked() {
for i, hash := range self.hashPool {
if self.pool[string(hash)] == nil {
continue
}
block := self.pool[string(hash)].block
if block != nil {
f(block)
delete(self.pool, string(hash))
} else {
self.hashPool = self.hashPool[i:]
return false
}
}
return true
}
return false
}
func (self *BlockPool) IsLinked() bool {
if len(self.hashPool) == 0 {
return false
}
for i := 0; i < len(self.hashPool); i++ {
item := self.pool[string(self.hashPool[i])]
if item != nil && item.block != nil {
if self.eth.BlockChain().HasBlock(item.block.PrevHash) {
self.hashPool = self.hashPool[i:]
return true
}
}
}
return false
}
func (self *BlockPool) Take(amount int, peer *Peer) (hashes [][]byte) {
self.mut.Lock()
defer self.mut.Unlock()
num := int(math.Min(float64(amount), float64(len(self.pool))))
j := 0
for i := 0; i < len(self.hashPool) && j < num; i++ {
hash := string(self.hashPool[i])
if self.pool[hash] != nil && (self.pool[hash].peer == nil || self.pool[hash].peer == peer) && self.pool[hash].block == nil {
self.pool[hash].peer = peer
hashes = append(hashes, self.hashPool[i])
j++
}
}
return
}
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