158 lines
3.4 KiB
Go
158 lines
3.4 KiB
Go
package downloader
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import (
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"math"
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"math/big"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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"gopkg.in/fatih/set.v0"
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)
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// queue represents hashes that are either need fetching or are being fetched
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type queue struct {
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hashPool *set.Set
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fetchPool *set.Set
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blockHashes *set.Set
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mu sync.Mutex
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fetching map[string]*chunk
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blocks []*types.Block
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}
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func newqueue() *queue {
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return &queue{
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hashPool: set.New(),
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fetchPool: set.New(),
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blockHashes: set.New(),
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fetching: make(map[string]*chunk),
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}
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}
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func (c *queue) reset() {
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c.mu.Lock()
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defer c.mu.Unlock()
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c.hashPool.Clear()
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c.fetchPool.Clear()
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c.blockHashes.Clear()
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c.blocks = nil
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c.fetching = make(map[string]*chunk)
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}
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// reserve a `max` set of hashes for `p` peer.
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func (c *queue) get(p *peer, max int) *chunk {
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c.mu.Lock()
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defer c.mu.Unlock()
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// return nothing if the pool has been depleted
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if c.hashPool.Size() == 0 {
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return nil
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}
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limit := int(math.Min(float64(max), float64(c.hashPool.Size())))
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// Create a new set of hashes
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hashes, i := set.New(), 0
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c.hashPool.Each(func(v interface{}) bool {
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// break on limit
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if i == limit {
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return false
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}
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// skip any hashes that have previously been requested from the peer
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if p.ignored.Has(v) {
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return true
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}
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hashes.Add(v)
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i++
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return true
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})
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// if no hashes can be requested return a nil chunk
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if hashes.Size() == 0 {
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return nil
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}
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// remove the fetchable hashes from hash pool
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c.hashPool.Separate(hashes)
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c.fetchPool.Merge(hashes)
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// Create a new chunk for the seperated hashes. The time is being used
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// to reset the chunk (timeout)
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chunk := &chunk{p, hashes, time.Now()}
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// register as 'fetching' state
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c.fetching[p.id] = chunk
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// create new chunk for peer
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return chunk
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}
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func (c *queue) has(hash common.Hash) bool {
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return c.hashPool.Has(hash) || c.fetchPool.Has(hash)
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}
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func (c *queue) addBlock(id string, block *types.Block, td *big.Int) {
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c.mu.Lock()
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defer c.mu.Unlock()
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// when adding a block make sure it doesn't already exist
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if !c.blockHashes.Has(block.Hash()) {
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c.hashPool.Remove(block.Hash())
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c.blocks = append(c.blocks, block)
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}
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}
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// deliver delivers a chunk to the queue that was requested of the peer
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func (c *queue) deliver(id string, blocks []*types.Block) {
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c.mu.Lock()
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defer c.mu.Unlock()
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chunk := c.fetching[id]
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// If the chunk was never requested simply ignore it
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if chunk != nil {
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delete(c.fetching, id)
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// check the length of the returned blocks. If the length of blocks is 0
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// we'll assume the peer doesn't know about the chain.
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if len(blocks) == 0 {
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// So we can ignore the blocks we didn't know about
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chunk.peer.ignored.Merge(chunk.hashes)
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}
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// seperate the blocks and the hashes
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blockHashes := chunk.fetchedHashes(blocks)
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// merge block hashes
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c.blockHashes.Merge(blockHashes)
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// Add the blocks
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c.blocks = append(c.blocks, blocks...)
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// Add back whatever couldn't be delivered
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c.hashPool.Merge(chunk.hashes)
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c.fetchPool.Separate(chunk.hashes)
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}
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}
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// puts puts sets of hashes on to the queue for fetching
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func (c *queue) put(hashes *set.Set) {
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c.mu.Lock()
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defer c.mu.Unlock()
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c.hashPool.Merge(hashes)
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}
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type chunk struct {
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peer *peer
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hashes *set.Set
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itime time.Time
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}
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func (ch *chunk) fetchedHashes(blocks []*types.Block) *set.Set {
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fhashes := set.New()
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for _, block := range blocks {
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fhashes.Add(block.Hash())
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}
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ch.hashes.Separate(fhashes)
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return fhashes
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}
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