forked from cerc-io/plugeth
95038fc62d
- fix status chain map uses common.Hash as key - add badPeers increment to IncorrectTD errors (forgotten) - signal head info update to head section process even if parent hash is not in pool (inserted), so that idle timer can be set to nil - suicideC -> peer.headInfoTimer - quit -> peer.bestIdleTimer - and they are properly set from within getBlockHashes and handleSection
679 lines
20 KiB
Go
679 lines
20 KiB
Go
package blockpool
|
|
|
|
import (
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/ethereum/go-ethereum/core/types"
|
|
)
|
|
|
|
/*
|
|
section is the worker on each chain section in the block pool
|
|
- remove the section if there are blocks missing after an absolute time
|
|
- remove the section if there are maxIdleRounds of idle rounds of block requests with no response
|
|
- periodically polls the chain section for missing blocks which are then requested from peers
|
|
- registers the process controller on the peer so that if the peer is promoted as best peer the second time (after a disconnect of a better one), all active processes are switched back on unless they removed (inserted in blockchain, invalid or expired)
|
|
- when turned off (if peer disconnects and new peer connects with alternative chain), no blockrequests are made but absolute expiry timer is ticking
|
|
- when turned back on it recursively calls itself on the root of the next chain section
|
|
*/
|
|
type section struct {
|
|
lock sync.RWMutex
|
|
|
|
parent *section // connecting section back in time towards blockchain
|
|
child *section // connecting section forward in time
|
|
|
|
top *node // the topmost node = head node = youngest node within the chain section
|
|
bottom *node // the bottom node = root node = oldest node within the chain section
|
|
nodes []*node
|
|
|
|
peer *peer
|
|
parentHash common.Hash
|
|
|
|
blockHashes []common.Hash
|
|
|
|
poolRootIndex int
|
|
|
|
bp *BlockPool
|
|
|
|
controlC chan *peer // to (de)register the current best peer
|
|
poolRootC chan *peer // indicate connectedness to blockchain (well, known blocks)
|
|
offC chan bool // closed if process terminated
|
|
suicideC chan bool // initiate suicide on the section
|
|
quitInitC chan bool // to signal end of initialisation
|
|
forkC chan chan bool // freeze section process while splitting
|
|
switchC chan bool // switching
|
|
idleC chan bool // channel to indicate thai food
|
|
processC chan *node //
|
|
missingC chan *node //
|
|
|
|
blocksRequestTimer <-chan time.Time
|
|
blockHashesRequestTimer <-chan time.Time
|
|
suicideTimer <-chan time.Time
|
|
|
|
blocksRequests int
|
|
blockHashesRequests int
|
|
|
|
blocksRequestsComplete bool
|
|
blockHashesRequestsComplete bool
|
|
ready bool
|
|
same bool
|
|
initialised bool
|
|
active bool
|
|
|
|
step int
|
|
idle int
|
|
missing int
|
|
lastMissing int
|
|
depth int
|
|
invalid bool
|
|
poolRoot bool
|
|
}
|
|
|
|
//
|
|
func (self *BlockPool) newSection(nodes []*node) *section {
|
|
sec := §ion{
|
|
bottom: nodes[len(nodes)-1],
|
|
top: nodes[0],
|
|
nodes: nodes,
|
|
poolRootIndex: len(nodes),
|
|
bp: self,
|
|
controlC: make(chan *peer),
|
|
poolRootC: make(chan *peer),
|
|
offC: make(chan bool),
|
|
}
|
|
|
|
for i, n := range nodes {
|
|
entry := &entry{node: n, section: sec, index: &index{i}}
|
|
self.set(n.hash, entry)
|
|
}
|
|
|
|
plog.DebugDetailf("[%s] setup section process", sectionhex(sec))
|
|
|
|
go sec.run()
|
|
return sec
|
|
}
|
|
|
|
func (self *section) addSectionToBlockChain(p *peer) {
|
|
self.bp.wg.Add(1)
|
|
go func() {
|
|
|
|
self.lock.Lock()
|
|
defer self.lock.Unlock()
|
|
defer func() {
|
|
self.bp.wg.Done()
|
|
}()
|
|
|
|
var nodes []*node
|
|
var n *node
|
|
var keys []common.Hash
|
|
var blocks []*types.Block
|
|
for self.poolRootIndex > 0 {
|
|
n = self.nodes[self.poolRootIndex-1]
|
|
n.lock.RLock()
|
|
block := n.block
|
|
n.lock.RUnlock()
|
|
if block == nil {
|
|
break
|
|
}
|
|
self.poolRootIndex--
|
|
keys = append(keys, n.hash)
|
|
blocks = append(blocks, block)
|
|
nodes = append(nodes, n)
|
|
}
|
|
|
|
if len(blocks) == 0 {
|
|
return
|
|
}
|
|
|
|
self.bp.lock.Lock()
|
|
for _, key := range keys {
|
|
delete(self.bp.pool, key)
|
|
}
|
|
self.bp.lock.Unlock()
|
|
|
|
plog.Infof("[%s] insert %v blocks [%v/%v] into blockchain", sectionhex(self), len(blocks), hex(blocks[0].Hash()), hex(blocks[len(blocks)-1].Hash()))
|
|
err := self.bp.insertChain(blocks)
|
|
if err != nil {
|
|
self.invalid = true
|
|
self.bp.peers.peerError(n.blockBy, ErrInvalidBlock, "%v", err)
|
|
plog.Warnf("invalid block %x", n.hash)
|
|
plog.Warnf("penalise peers %v (hash), %v (block)", n.hashBy, n.blockBy)
|
|
|
|
// or invalid block and the entire chain needs to be removed
|
|
self.removeChain()
|
|
} else {
|
|
// check tds
|
|
self.bp.wg.Add(1)
|
|
go func() {
|
|
plog.DebugDetailf("checking td")
|
|
self.bp.checkTD(nodes...)
|
|
self.bp.wg.Done()
|
|
}()
|
|
// if all blocks inserted in this section
|
|
// then need to try to insert blocks in child section
|
|
if self.poolRootIndex == 0 {
|
|
// if there is a child section, then recursively call itself:
|
|
// also if section process is not terminated,
|
|
// then signal blockchain connectivity with poolRootC
|
|
if child := self.bp.getChild(self); child != nil {
|
|
select {
|
|
case <-child.offC:
|
|
plog.DebugDetailf("[%s] add complete child section [%s] to the blockchain", sectionhex(self), sectionhex(child))
|
|
case child.poolRootC <- p:
|
|
plog.DebugDetailf("[%s] add incomplete child section [%s] to the blockchain", sectionhex(self), sectionhex(child))
|
|
}
|
|
child.addSectionToBlockChain(p)
|
|
} else {
|
|
plog.DebugDetailf("[%s] no child section in pool", sectionhex(self))
|
|
}
|
|
plog.DebugDetailf("[%s] section completely inserted to blockchain - remove", sectionhex(self))
|
|
// complete sections are removed. if called from within section process,
|
|
// this must run in its own go routine to avoid deadlock
|
|
self.remove()
|
|
}
|
|
}
|
|
|
|
self.bp.status.lock.Lock()
|
|
if err == nil {
|
|
headKey := blocks[0].ParentHash()
|
|
height := self.bp.status.chain[headKey] + len(blocks)
|
|
self.bp.status.chain[blocks[len(blocks)-1].Hash()] = height
|
|
if height > self.bp.status.values.LongestChain {
|
|
self.bp.status.values.LongestChain = height
|
|
}
|
|
delete(self.bp.status.chain, headKey)
|
|
}
|
|
self.bp.status.values.BlocksInChain += len(blocks)
|
|
self.bp.status.values.BlocksInPool -= len(blocks)
|
|
if err != nil {
|
|
self.bp.status.badPeers[n.blockBy]++
|
|
}
|
|
self.bp.status.lock.Unlock()
|
|
|
|
}()
|
|
|
|
}
|
|
|
|
func (self *section) run() {
|
|
|
|
// absolute time after which sub-chain is killed if not complete (some blocks are missing)
|
|
self.suicideC = make(chan bool)
|
|
self.forkC = make(chan chan bool)
|
|
self.suicideTimer = time.After(self.bp.Config.BlocksTimeout)
|
|
|
|
// node channels for the section
|
|
// container for missing block hashes
|
|
var checking bool
|
|
var ping = time.NewTicker(5 * time.Second)
|
|
|
|
LOOP:
|
|
for !self.blockHashesRequestsComplete || !self.blocksRequestsComplete {
|
|
|
|
select {
|
|
case <-ping.C:
|
|
var name = "no peer"
|
|
if self.peer != nil {
|
|
name = self.peer.id
|
|
}
|
|
plog.DebugDetailf("[%s] peer <%s> active: %v", sectionhex(self), name, self.active)
|
|
|
|
// global quit from blockpool
|
|
case <-self.bp.quit:
|
|
break LOOP
|
|
|
|
// pause for peer switching
|
|
case <-self.switchC:
|
|
self.switchC = nil
|
|
|
|
case p := <-self.poolRootC:
|
|
// signal on pool root channel indicates that the blockpool is
|
|
// connected to the blockchain, insert the longest chain of blocks
|
|
// ignored in idle mode to avoid inserting chain sections of non-live peers
|
|
self.poolRoot = true
|
|
// switch off hash requests in case they were on
|
|
self.blockHashesRequestTimer = nil
|
|
self.blockHashesRequestsComplete = true
|
|
self.switchOn(p)
|
|
|
|
// peer quit or demoted, put section in idle mode
|
|
case <-self.idleC:
|
|
// peer quit or demoted, put section in idle mode
|
|
plog.Debugf("[%s] peer <%s> quit or demoted", sectionhex(self), self.peer.id)
|
|
self.switchOff()
|
|
self.idleC = nil
|
|
|
|
// timebomb - if section is not complete in time, nuke the entire chain
|
|
case <-self.suicideTimer:
|
|
self.removeChain()
|
|
plog.Debugf("[%s] timeout. (%v total attempts): missing %v/%v/%v...suicide", sectionhex(self), self.blocksRequests, self.missing, self.lastMissing, self.depth)
|
|
self.suicideTimer = nil
|
|
break LOOP
|
|
|
|
// closing suicideC triggers section suicide: removes section nodes from pool and terminates section process
|
|
case <-self.suicideC:
|
|
plog.DebugDetailf("[%s] quit", sectionhex(self))
|
|
break LOOP
|
|
|
|
// alarm for checking blocks in the section
|
|
case <-self.blocksRequestTimer:
|
|
plog.DebugDetailf("[%s] alarm: block request time", sectionhex(self))
|
|
self.processC = self.missingC
|
|
|
|
// alarm for checking parent of the section or sending out hash requests
|
|
case <-self.blockHashesRequestTimer:
|
|
plog.DebugDetailf("[%s] alarm: hash request time", sectionhex(self))
|
|
self.blockHashesRequest()
|
|
|
|
// activate this section process with a peer
|
|
case p := <-self.controlC:
|
|
if p == nil {
|
|
self.switchOff()
|
|
} else {
|
|
self.switchOn(p)
|
|
}
|
|
self.bp.wg.Done()
|
|
// blocks the process until section is split at the fork
|
|
case waiter := <-self.forkC:
|
|
<-waiter
|
|
self.initialised = false
|
|
self.quitInitC = nil
|
|
|
|
//
|
|
case n, ok := <-self.processC:
|
|
// channel closed, first iteration finished
|
|
if !ok && !self.initialised {
|
|
plog.DebugDetailf("[%s] section initalised: missing %v/%v/%v", sectionhex(self), self.missing, self.lastMissing, self.depth)
|
|
self.initialised = true
|
|
self.processC = nil
|
|
// self.processC = make(chan *node, self.missing)
|
|
self.checkRound()
|
|
checking = false
|
|
break
|
|
}
|
|
// plog.DebugDetailf("[%s] section proc step %v: missing %v/%v/%v", sectionhex(self), self.step, self.missing, self.lastMissing, self.depth)
|
|
if !checking {
|
|
self.step = 0
|
|
self.missing = 0
|
|
checking = true
|
|
}
|
|
self.step++
|
|
|
|
n.lock.RLock()
|
|
block := n.block
|
|
n.lock.RUnlock()
|
|
|
|
// if node has no block, request it (buffer it for batch request)
|
|
// feed it to missingC channel for the next round
|
|
if block == nil {
|
|
pos := self.missing % self.bp.Config.BlockBatchSize
|
|
if pos == 0 {
|
|
if self.missing != 0 {
|
|
self.bp.requestBlocks(self.blocksRequests, self.blockHashes[:])
|
|
}
|
|
self.blockHashes = self.bp.getHashSlice()
|
|
}
|
|
self.blockHashes[pos] = n.hash
|
|
self.missing++
|
|
self.missingC <- n
|
|
} else {
|
|
// checking for parent block
|
|
if self.poolRoot {
|
|
// if node has got block (received via async AddBlock call from protocol)
|
|
if self.step == self.lastMissing {
|
|
// current root of the pool
|
|
plog.DebugDetailf("[%s] received block for current pool root %s", sectionhex(self), hex(n.hash))
|
|
self.addSectionToBlockChain(self.peer)
|
|
}
|
|
} else {
|
|
if (self.parentHash == common.Hash{}) && n == self.bottom {
|
|
self.parentHash = block.ParentHash()
|
|
plog.DebugDetailf("[%s] got parent head block hash %s...checking", sectionhex(self), hex(self.parentHash))
|
|
self.blockHashesRequest()
|
|
}
|
|
}
|
|
}
|
|
if self.initialised && self.step == self.lastMissing {
|
|
plog.DebugDetailf("[%s] check if new blocks arrived (attempt %v): missing %v/%v/%v", sectionhex(self), self.blocksRequests, self.missing, self.lastMissing, self.depth)
|
|
self.checkRound()
|
|
checking = false
|
|
}
|
|
} // select
|
|
} // for
|
|
|
|
close(self.offC)
|
|
if self.peer != nil {
|
|
self.active = false
|
|
self.bp.wg.Done()
|
|
}
|
|
|
|
plog.DebugDetailf("[%s] section process terminated: %v blocks retrieved (%v attempts), hash requests complete on root (%v attempts).", sectionhex(self), self.depth, self.blocksRequests, self.blockHashesRequests)
|
|
|
|
}
|
|
|
|
func (self *section) switchOn(newpeer *peer) {
|
|
|
|
oldpeer := self.peer
|
|
// reset switchC/switchC to current best peer
|
|
self.idleC = newpeer.idleC
|
|
self.switchC = newpeer.switchC
|
|
self.peer = newpeer
|
|
|
|
if oldpeer != newpeer {
|
|
oldp := "no peer"
|
|
newp := "no peer"
|
|
if oldpeer != nil {
|
|
oldp = oldpeer.id
|
|
}
|
|
if newpeer != nil {
|
|
newp = newpeer.id
|
|
}
|
|
|
|
plog.DebugDetailf("[%s] active mode <%s> -> <%s>", sectionhex(self), oldp, newp)
|
|
}
|
|
|
|
// activate section with current peer
|
|
if oldpeer == nil {
|
|
self.bp.wg.Add(1)
|
|
self.active = true
|
|
|
|
if !self.blockHashesRequestsComplete {
|
|
self.blockHashesRequestTimer = time.After(0)
|
|
}
|
|
if !self.blocksRequestsComplete {
|
|
if !self.initialised {
|
|
if self.quitInitC != nil {
|
|
<-self.quitInitC
|
|
}
|
|
self.missingC = make(chan *node, self.bp.Config.BlockHashesBatchSize)
|
|
self.processC = make(chan *node, self.bp.Config.BlockHashesBatchSize)
|
|
self.quitInitC = make(chan bool)
|
|
|
|
self.step = 0
|
|
self.missing = 0
|
|
self.depth = len(self.nodes)
|
|
self.lastMissing = self.depth
|
|
|
|
self.feedNodes()
|
|
} else {
|
|
self.blocksRequestTimer = time.After(0)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// put the section to idle mode
|
|
func (self *section) switchOff() {
|
|
// active -> idle
|
|
if self.peer != nil {
|
|
oldp := "no peer"
|
|
oldpeer := self.peer
|
|
if oldpeer != nil {
|
|
oldp = oldpeer.id
|
|
}
|
|
plog.DebugDetailf("[%s] idle mode peer <%s> -> <> (%v total attempts): missing %v/%v/%v", sectionhex(self), oldp, self.blocksRequests, self.missing, self.lastMissing, self.depth)
|
|
|
|
self.active = false
|
|
self.peer = nil
|
|
// turn off timers
|
|
self.blocksRequestTimer = nil
|
|
self.blockHashesRequestTimer = nil
|
|
|
|
if self.quitInitC != nil {
|
|
<-self.quitInitC
|
|
self.quitInitC = nil
|
|
}
|
|
self.processC = nil
|
|
self.bp.wg.Done()
|
|
}
|
|
}
|
|
|
|
// iterates through nodes of a section to feed processC
|
|
// used to initialise chain section
|
|
func (self *section) feedNodes() {
|
|
// if not run at least once fully, launch iterator
|
|
self.bp.wg.Add(1)
|
|
go func() {
|
|
self.lock.Lock()
|
|
defer self.lock.Unlock()
|
|
defer func() {
|
|
self.bp.wg.Done()
|
|
}()
|
|
var n *node
|
|
INIT:
|
|
for _, n = range self.nodes {
|
|
select {
|
|
case self.processC <- n:
|
|
case <-self.bp.quit:
|
|
break INIT
|
|
}
|
|
}
|
|
close(self.processC)
|
|
close(self.quitInitC)
|
|
}()
|
|
}
|
|
|
|
func (self *section) blockHashesRequest() {
|
|
|
|
if self.switchC != nil {
|
|
self.bp.chainLock.Lock()
|
|
parentSection := self.parent
|
|
|
|
if parentSection == nil {
|
|
|
|
// only link to new parent if not switching peers
|
|
// this protects against synchronisation issue where during switching
|
|
// a demoted peer's fork will be chosen over the best peer's chain
|
|
// because relinking the correct chain (activateChain) is overwritten here in
|
|
// demoted peer's section process just before the section is put to idle mode
|
|
if (self.parentHash != common.Hash{}) {
|
|
if parent := self.bp.get(self.parentHash); parent != nil {
|
|
parentSection = parent.section
|
|
plog.DebugDetailf("[%s] blockHashesRequest: parent section [%s] linked\n", sectionhex(self), sectionhex(parentSection))
|
|
link(parentSection, self)
|
|
} else {
|
|
if self.bp.hasBlock(self.parentHash) {
|
|
self.poolRoot = true
|
|
plog.DebugDetailf("[%s] blockHashesRequest: parentHash known ... inserting section in blockchain", sectionhex(self))
|
|
self.addSectionToBlockChain(self.peer)
|
|
self.blockHashesRequestTimer = nil
|
|
self.blockHashesRequestsComplete = true
|
|
}
|
|
}
|
|
}
|
|
}
|
|
self.bp.chainLock.Unlock()
|
|
|
|
if !self.poolRoot {
|
|
if parentSection != nil {
|
|
// activate parent section with this peer
|
|
// but only if not during switch mode
|
|
plog.DebugDetailf("[%s] parent section [%s] activated\n", sectionhex(self), sectionhex(parentSection))
|
|
self.bp.activateChain(parentSection, self.peer, nil)
|
|
// if not root of chain, switch off
|
|
plog.DebugDetailf("[%s] parent found, hash requests deactivated (after %v total attempts)\n", sectionhex(self), self.blockHashesRequests)
|
|
self.blockHashesRequestTimer = nil
|
|
self.blockHashesRequestsComplete = true
|
|
} else {
|
|
self.blockHashesRequests++
|
|
plog.DebugDetailf("[%s] hash request on root (%v total attempts)\n", sectionhex(self), self.blockHashesRequests)
|
|
self.peer.requestBlockHashes(self.bottom.hash)
|
|
self.blockHashesRequestTimer = time.After(self.bp.Config.BlockHashesRequestInterval)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// checks number of missing blocks after each round of request and acts accordingly
|
|
func (self *section) checkRound() {
|
|
if self.missing == 0 {
|
|
// no missing blocks
|
|
plog.DebugDetailf("[%s] section checked: got all blocks. process complete (%v total blocksRequests): missing %v/%v/%v", sectionhex(self), self.blocksRequests, self.missing, self.lastMissing, self.depth)
|
|
self.blocksRequestsComplete = true
|
|
self.blocksRequestTimer = nil
|
|
} else {
|
|
// some missing blocks
|
|
plog.DebugDetailf("[%s] section checked: missing %v/%v/%v", sectionhex(self), self.missing, self.lastMissing, self.depth)
|
|
self.blocksRequests++
|
|
pos := self.missing % self.bp.Config.BlockBatchSize
|
|
if pos == 0 {
|
|
pos = self.bp.Config.BlockBatchSize
|
|
}
|
|
self.bp.requestBlocks(self.blocksRequests, self.blockHashes[:pos])
|
|
|
|
// handle idle rounds
|
|
if self.missing == self.lastMissing {
|
|
// idle round
|
|
if self.same {
|
|
// more than once
|
|
self.idle++
|
|
// too many idle rounds
|
|
if self.idle >= self.bp.Config.BlocksRequestMaxIdleRounds {
|
|
plog.DebugDetailf("[%s] block requests had %v idle rounds (%v total attempts): missing %v/%v/%v\ngiving up...", sectionhex(self), self.idle, self.blocksRequests, self.missing, self.lastMissing, self.depth)
|
|
self.removeChain()
|
|
}
|
|
} else {
|
|
self.idle = 0
|
|
}
|
|
self.same = true
|
|
} else {
|
|
self.same = false
|
|
}
|
|
self.lastMissing = self.missing
|
|
// put processC offline
|
|
self.processC = nil
|
|
self.blocksRequestTimer = time.After(self.bp.Config.BlocksRequestInterval)
|
|
}
|
|
}
|
|
|
|
/*
|
|
link connects two sections via parent/child fields
|
|
creating a doubly linked list
|
|
caller must hold BlockPool chainLock
|
|
*/
|
|
func link(parent *section, child *section) {
|
|
if parent != nil {
|
|
exChild := parent.child
|
|
parent.child = child
|
|
if exChild != nil && exChild != child {
|
|
if child != nil {
|
|
// if child is nil it is not a real fork
|
|
plog.DebugDetailf("[%s] chain fork [%s] -> [%s]", sectionhex(parent), sectionhex(exChild), sectionhex(child))
|
|
}
|
|
exChild.parent = nil
|
|
}
|
|
}
|
|
if child != nil {
|
|
exParent := child.parent
|
|
if exParent != nil && exParent != parent {
|
|
if parent != nil {
|
|
// if parent is nil it is not a real fork, but suicide delinking section
|
|
plog.DebugDetailf("[%s] chain reverse fork [%s] -> [%s]", sectionhex(child), sectionhex(exParent), sectionhex(parent))
|
|
}
|
|
exParent.child = nil
|
|
}
|
|
child.parent = parent
|
|
}
|
|
}
|
|
|
|
/*
|
|
handle forks where connecting node is mid-section
|
|
by splitting section at fork
|
|
no splitting needed if connecting node is head of a section
|
|
caller must hold chain lock
|
|
*/
|
|
func (self *BlockPool) splitSection(parent *section, entry *entry) {
|
|
plog.DebugDetailf("[%s] split section at fork", sectionhex(parent))
|
|
parent.deactivate()
|
|
waiter := make(chan bool)
|
|
parent.wait(waiter)
|
|
chain := parent.nodes
|
|
parent.nodes = chain[entry.index.int:]
|
|
parent.top = parent.nodes[0]
|
|
parent.poolRootIndex -= entry.index.int
|
|
orphan := self.newSection(chain[0:entry.index.int])
|
|
link(orphan, parent.child)
|
|
close(waiter)
|
|
orphan.deactivate()
|
|
}
|
|
|
|
func (self *section) wait(waiter chan bool) {
|
|
self.forkC <- waiter
|
|
}
|
|
|
|
func (self *BlockPool) linkSections(nodes []*node, parent, child *section) (sec *section) {
|
|
// if new section is created, link it to parent/child sections
|
|
// and launch section process fetching block and further hashes
|
|
if len(nodes) > 0 {
|
|
sec = self.newSection(nodes)
|
|
plog.Debugf("[%s]->[%s](%v)->[%s] new chain section", sectionhex(parent), sectionhex(sec), len(nodes), sectionhex(child))
|
|
link(parent, sec)
|
|
link(sec, child)
|
|
} else {
|
|
if parent != nil && child != nil {
|
|
// now this can only happen if we allow response to hash request to include <from> hash
|
|
// in this case we just link parent and child (without needing root block of child section)
|
|
plog.Debugf("[%s]->[%s] connecting known sections", sectionhex(parent), sectionhex(child))
|
|
link(parent, child)
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
func (self *section) activate(p *peer) {
|
|
self.bp.wg.Add(1)
|
|
select {
|
|
case <-self.offC:
|
|
plog.DebugDetailf("[%s] completed section process. cannot activate for peer <%s>", sectionhex(self), p.id)
|
|
self.bp.wg.Done()
|
|
case self.controlC <- p:
|
|
plog.DebugDetailf("[%s] activate section process for peer <%s>", sectionhex(self), p.id)
|
|
}
|
|
}
|
|
|
|
func (self *section) deactivate() {
|
|
self.bp.wg.Add(1)
|
|
self.controlC <- nil
|
|
}
|
|
|
|
// removes this section exacly
|
|
func (self *section) remove() {
|
|
select {
|
|
case <-self.offC:
|
|
close(self.suicideC)
|
|
plog.DebugDetailf("[%s] remove: suicide", sectionhex(self))
|
|
case <-self.suicideC:
|
|
plog.DebugDetailf("[%s] remove: suicided already", sectionhex(self))
|
|
default:
|
|
plog.DebugDetailf("[%s] remove: suicide", sectionhex(self))
|
|
close(self.suicideC)
|
|
}
|
|
self.unlink()
|
|
self.bp.remove(self)
|
|
plog.DebugDetailf("[%s] removed section.", sectionhex(self))
|
|
|
|
}
|
|
|
|
// remove a section and all its descendents from the pool
|
|
func (self *section) removeChain() {
|
|
// need to get the child before removeSection delinks the section
|
|
self.bp.chainLock.RLock()
|
|
child := self.child
|
|
self.bp.chainLock.RUnlock()
|
|
|
|
plog.DebugDetailf("[%s] remove chain", sectionhex(self))
|
|
self.remove()
|
|
if child != nil {
|
|
child.removeChain()
|
|
}
|
|
}
|
|
|
|
// unlink a section from its parent/child
|
|
func (self *section) unlink() {
|
|
// first delink from child and parent under chainlock
|
|
self.bp.chainLock.Lock()
|
|
link(nil, self)
|
|
link(self, nil)
|
|
self.bp.chainLock.Unlock()
|
|
}
|