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[release/1.4.11] eth, eth/downloader: better remote head tracking

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(cherry picked from commit 1dd272080d)

Conflicts:
	eth/handler.go
	eth/sync.go
This commit is contained in:
Péter Szilágyi
2016-07-25 15:14:14 +03:00
committed by Jeffrey Wilcke
parent 65da8f601f
commit 48709d5340
6 changed files with 62 additions and 51 deletions
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13
eth/downloader/peer.go
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@@ -23,6 +23,7 @@ import (
"errors"
"fmt"
"math"
"math/big"
"sort"
"strings"
"sync"
@@ -37,6 +38,9 @@ const (
measurementImpact = 0.1 // The impact a single measurement has on a peer's final throughput value.
)
// Head hash and total difficulty retriever for
type currentHeadRetrievalFn func() (common.Hash, *big.Int)
// Block header and body fetchers belonging to eth/62 and above
type relativeHeaderFetcherFn func(common.Hash, int, int, bool) error
type absoluteHeaderFetcherFn func(uint64, int, int, bool) error
@@ -52,8 +56,7 @@ var (
// peer represents an active peer from which hashes and blocks are retrieved.
type peer struct {
id string // Unique identifier of the peer
head common.Hash // Hash of the peers latest known block
id string // Unique identifier of the peer
headerIdle int32 // Current header activity state of the peer (idle = 0, active = 1)
blockIdle int32 // Current block activity state of the peer (idle = 0, active = 1)
@@ -74,6 +77,8 @@ type peer struct {
lacking map[common.Hash]struct{} // Set of hashes not to request (didn't have previously)
currentHead currentHeadRetrievalFn // Method to fetch the currently known head of the peer
getRelHeaders relativeHeaderFetcherFn // [eth/62] Method to retrieve a batch of headers from an origin hash
getAbsHeaders absoluteHeaderFetcherFn // [eth/62] Method to retrieve a batch of headers from an absolute position
getBlockBodies blockBodyFetcherFn // [eth/62] Method to retrieve a batch of block bodies
@@ -87,14 +92,14 @@ type peer struct {
// newPeer create a new downloader peer, with specific hash and block retrieval
// mechanisms.
func newPeer(id string, version int, head common.Hash,
func newPeer(id string, version int, currentHead currentHeadRetrievalFn,
getRelHeaders relativeHeaderFetcherFn, getAbsHeaders absoluteHeaderFetcherFn, getBlockBodies blockBodyFetcherFn,
getReceipts receiptFetcherFn, getNodeData stateFetcherFn) *peer {
return &peer{
id: id,
head: head,
lacking: make(map[common.Hash]struct{}),
currentHead: currentHead,
getRelHeaders: getRelHeaders,
getAbsHeaders: getAbsHeaders,
getBlockBodies: getBlockBodies,