2019-08-03 12:36:10 +00:00
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// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package les
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"io"
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"math"
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"sync"
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"time"
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2019-11-02 12:02:35 +00:00
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/mclock"
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"github.com/ethereum/go-ethereum/common/prque"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/p2p/enode"
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"github.com/ethereum/go-ethereum/rlp"
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lru "github.com/hashicorp/golang-lru"
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)
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const (
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negBalanceExpTC = time.Hour // time constant for exponentially reducing negative balance
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fixedPointMultiplier = 0x1000000 // constant to convert logarithms to fixed point format
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lazyQueueRefresh = time.Second * 10 // refresh period of the connected queue
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persistCumulativeTimeRefresh = time.Minute * 5 // refresh period of the cumulative running time persistence
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posBalanceCacheLimit = 8192 // the maximum number of cached items in positive balance queue
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negBalanceCacheLimit = 8192 // the maximum number of cached items in negative balance queue
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defaultConnectedBias = time.Minute * 3 // the default connectedBias used in clientPool
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)
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// clientPool implements a client database that assigns a priority to each client
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// based on a positive and negative balance. Positive balance is externally assigned
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// to prioritized clients and is decreased with connection time and processed
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// requests (unless the price factors are zero). If the positive balance is zero
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// then negative balance is accumulated.
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//
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// Balance tracking and priority calculation for connected clients is done by
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// balanceTracker. connectedQueue ensures that clients with the lowest positive or
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// highest negative balance get evicted when the total capacity allowance is full
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// and new clients with a better balance want to connect.
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//
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// Already connected nodes receive a small bias in their favor in order to avoid
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// accepting and instantly kicking out clients. In theory, we try to ensure that
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// each client can have several minutes of connection time.
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//
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// Balances of disconnected clients are stored in nodeDB including positive balance
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// and negative banalce. Negative balance is transformed into a logarithmic form
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// with a constantly shifting linear offset in order to implement an exponential
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// decrease. Besides nodeDB will have a background thread to check the negative
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// balance of disconnected client. If the balance is low enough, then the record
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// will be dropped.
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type clientPool struct {
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ndb *nodeDB
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lock sync.Mutex
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clock mclock.Clock
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stopCh chan struct{}
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closed bool
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removePeer func(enode.ID)
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connectedMap map[enode.ID]*clientInfo
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connectedQueue *prque.LazyQueue
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defaultPosFactors, defaultNegFactors priceFactors
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connLimit int // The maximum number of connections that clientpool can support
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capLimit uint64 // The maximum cumulative capacity that clientpool can support
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connectedCap uint64 // The sum of the capacity of the current clientpool connected
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priorityConnected uint64 // The sum of the capacity of currently connected priority clients
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freeClientCap uint64 // The capacity value of each free client
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startTime mclock.AbsTime // The timestamp at which the clientpool started running
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cumulativeTime int64 // The cumulative running time of clientpool at the start point.
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connectedBias time.Duration // The connection bias. 0: Disable connection bias(used in testing)
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}
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2020-02-26 09:41:24 +00:00
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// clientPoolPeer represents a client peer in the pool.
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// Positive balances are assigned to node key while negative balances are assigned
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// to freeClientId. Currently network IP address without port is used because
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// clients have a limited access to IP addresses while new node keys can be easily
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// generated so it would be useless to assign a negative value to them.
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type clientPoolPeer interface {
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ID() enode.ID
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freeClientId() string
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updateCapacity(uint64)
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freezeClient()
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}
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// clientInfo represents a connected client
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type clientInfo struct {
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address string
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id enode.ID
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connectedAt mclock.AbsTime
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capacity uint64
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priority bool
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pool *clientPool
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peer clientPoolPeer
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queueIndex int // position in connectedQueue
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balanceTracker balanceTracker
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posFactors, negFactors priceFactors
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balanceMetaInfo string
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}
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// connSetIndex callback updates clientInfo item index in connectedQueue
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func connSetIndex(a interface{}, index int) {
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a.(*clientInfo).queueIndex = index
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}
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// connPriority callback returns actual priority of clientInfo item in connectedQueue
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func connPriority(a interface{}, now mclock.AbsTime) int64 {
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c := a.(*clientInfo)
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return c.balanceTracker.getPriority(now)
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}
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// connMaxPriority callback returns estimated maximum priority of clientInfo item in connectedQueue
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func connMaxPriority(a interface{}, until mclock.AbsTime) int64 {
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c := a.(*clientInfo)
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pri := c.balanceTracker.estimatedPriority(until, true)
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c.balanceTracker.addCallback(balanceCallbackQueue, pri+1, func() {
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c.pool.lock.Lock()
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if c.queueIndex != -1 {
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c.pool.connectedQueue.Update(c.queueIndex)
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}
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c.pool.lock.Unlock()
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})
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return pri
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}
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// priceFactors determine the pricing policy (may apply either to positive or
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// negative balances which may have different factors).
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// - timeFactor is cost unit per nanosecond of connection time
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// - capacityFactor is cost unit per nanosecond of connection time per 1000000 capacity
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// - requestFactor is cost unit per request "realCost" unit
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type priceFactors struct {
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timeFactor, capacityFactor, requestFactor float64
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}
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// newClientPool creates a new client pool
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func newClientPool(db ethdb.Database, freeClientCap uint64, clock mclock.Clock, removePeer func(enode.ID)) *clientPool {
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ndb := newNodeDB(db, clock)
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pool := &clientPool{
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ndb: ndb,
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clock: clock,
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connectedMap: make(map[enode.ID]*clientInfo),
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connectedQueue: prque.NewLazyQueue(connSetIndex, connPriority, connMaxPriority, clock, lazyQueueRefresh),
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freeClientCap: freeClientCap,
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removePeer: removePeer,
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startTime: clock.Now(),
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cumulativeTime: ndb.getCumulativeTime(),
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stopCh: make(chan struct{}),
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connectedBias: defaultConnectedBias,
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}
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// If the negative balance of free client is even lower than 1,
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// delete this entry.
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ndb.nbEvictCallBack = func(now mclock.AbsTime, b negBalance) bool {
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balance := math.Exp(float64(b.logValue-pool.logOffset(now)) / fixedPointMultiplier)
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return balance <= 1
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}
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go func() {
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for {
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select {
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case <-clock.After(lazyQueueRefresh):
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pool.lock.Lock()
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pool.connectedQueue.Refresh()
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pool.lock.Unlock()
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case <-clock.After(persistCumulativeTimeRefresh):
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pool.ndb.setCumulativeTime(pool.logOffset(clock.Now()))
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case <-pool.stopCh:
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return
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}
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}
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}()
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return pool
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}
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// stop shuts the client pool down
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func (f *clientPool) stop() {
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close(f.stopCh)
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f.lock.Lock()
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f.closed = true
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f.lock.Unlock()
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f.ndb.setCumulativeTime(f.logOffset(f.clock.Now()))
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f.ndb.close()
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}
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// connect should be called after a successful handshake. If the connection was
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// rejected, there is no need to call disconnect.
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func (f *clientPool) connect(peer clientPoolPeer, capacity uint64) bool {
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f.lock.Lock()
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defer f.lock.Unlock()
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2019-11-02 12:02:35 +00:00
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// Short circuit if clientPool is already closed.
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if f.closed {
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return false
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}
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// Dedup connected peers.
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id, freeID := peer.ID(), peer.freeClientId()
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if _, ok := f.connectedMap[id]; ok {
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clientRejectedMeter.Mark(1)
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log.Debug("Client already connected", "address", freeID, "id", id.String())
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return false
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}
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// Create a clientInfo but do not add it yet
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var (
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posBalance uint64
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negBalance uint64
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now = f.clock.Now()
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)
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pb := f.ndb.getOrNewPB(id)
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posBalance = pb.value
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2019-11-02 12:02:35 +00:00
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nb := f.ndb.getOrNewNB(freeID)
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if nb.logValue != 0 {
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negBalance = uint64(math.Exp(float64(nb.logValue-f.logOffset(now))/fixedPointMultiplier) * float64(time.Second))
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}
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e := &clientInfo{
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pool: f,
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peer: peer,
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address: freeID,
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queueIndex: -1,
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id: id,
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connectedAt: now,
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priority: posBalance != 0,
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posFactors: f.defaultPosFactors,
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negFactors: f.defaultNegFactors,
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balanceMetaInfo: pb.meta,
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}
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// If the client is a free client, assign with a low free capacity,
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// Otherwise assign with the given value(priority client)
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if !e.priority || capacity == 0 {
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capacity = f.freeClientCap
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}
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e.capacity = capacity
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2019-11-02 12:02:35 +00:00
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// Starts a balance tracker
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e.balanceTracker.init(f.clock, capacity)
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e.balanceTracker.setBalance(posBalance, negBalance)
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2019-11-13 22:47:03 +00:00
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e.updatePriceFactors()
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2019-08-27 11:07:25 +00:00
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// If the number of clients already connected in the clientpool exceeds its
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// capacity, evict some clients with lowest priority.
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//
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// If the priority of the newly added client is lower than the priority of
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// all connected clients, the client is rejected.
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newCapacity := f.connectedCap + capacity
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newCount := f.connectedQueue.Size() + 1
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if newCapacity > f.capLimit || newCount > f.connLimit {
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var (
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kickList []*clientInfo
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kickPriority int64
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)
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f.connectedQueue.MultiPop(func(data interface{}, priority int64) bool {
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c := data.(*clientInfo)
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kickList = append(kickList, c)
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kickPriority = priority
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newCapacity -= c.capacity
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newCount--
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return newCapacity > f.capLimit || newCount > f.connLimit
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})
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2020-07-21 08:23:40 +00:00
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if newCapacity > f.capLimit || newCount > f.connLimit || (e.balanceTracker.estimatedPriority(now+mclock.AbsTime(f.connectedBias), false)-kickPriority) > 0 {
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for _, c := range kickList {
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f.connectedQueue.Push(c)
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}
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clientRejectedMeter.Mark(1)
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log.Debug("Client rejected", "address", freeID, "id", id.String())
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return false
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}
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// accept new client, drop old ones
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for _, c := range kickList {
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f.dropClient(c, now, true)
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}
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}
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2019-11-13 22:47:03 +00:00
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2019-11-02 12:02:35 +00:00
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// Register new client to connection queue.
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f.connectedMap[id] = e
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f.connectedQueue.Push(e)
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f.connectedCap += e.capacity
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// If the current client is a paid client, monitor the status of client,
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// downgrade it to normal client if positive balance is used up.
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if e.priority {
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f.priorityConnected += capacity
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2019-08-03 12:36:10 +00:00
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e.balanceTracker.addCallback(balanceCallbackZero, 0, func() { f.balanceExhausted(id) })
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}
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|
// If the capacity of client is not the default value(free capacity), notify
|
|
|
|
// it to update capacity.
|
2019-08-03 12:36:10 +00:00
|
|
|
if e.capacity != f.freeClientCap {
|
|
|
|
e.peer.updateCapacity(e.capacity)
|
|
|
|
}
|
2019-11-02 12:02:35 +00:00
|
|
|
totalConnectedGauge.Update(int64(f.connectedCap))
|
2019-08-03 12:36:10 +00:00
|
|
|
clientConnectedMeter.Mark(1)
|
2019-08-27 11:07:25 +00:00
|
|
|
log.Debug("Client accepted", "address", freeID)
|
|
|
|
return true
|
2019-08-03 12:36:10 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// disconnect should be called when a connection is terminated. If the disconnection
|
|
|
|
// was initiated by the pool itself using disconnectFn then calling disconnect is
|
|
|
|
// not necessary but permitted.
|
2020-02-26 09:41:24 +00:00
|
|
|
func (f *clientPool) disconnect(p clientPoolPeer) {
|
2019-08-03 12:36:10 +00:00
|
|
|
f.lock.Lock()
|
|
|
|
defer f.lock.Unlock()
|
|
|
|
|
2019-11-02 12:02:35 +00:00
|
|
|
// Short circuit if client pool is already closed.
|
2019-08-03 12:36:10 +00:00
|
|
|
if f.closed {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
// Short circuit if the peer hasn't been registered.
|
2019-11-02 12:02:35 +00:00
|
|
|
e := f.connectedMap[p.ID()]
|
2019-08-03 12:36:10 +00:00
|
|
|
if e == nil {
|
2020-07-28 15:02:35 +00:00
|
|
|
log.Debug("Client not connected", "address", p.freeClientId(), "id", p.ID().String())
|
2019-08-03 12:36:10 +00:00
|
|
|
return
|
|
|
|
}
|
|
|
|
f.dropClient(e, f.clock.Now(), false)
|
|
|
|
}
|
|
|
|
|
2019-11-13 22:47:03 +00:00
|
|
|
// forClients iterates through a list of clients, calling the callback for each one.
|
|
|
|
// If a client is not connected then clientInfo is nil. If the specified list is empty
|
|
|
|
// then the callback is called for all connected clients.
|
|
|
|
func (f *clientPool) forClients(ids []enode.ID, callback func(*clientInfo, enode.ID) error) error {
|
|
|
|
f.lock.Lock()
|
|
|
|
defer f.lock.Unlock()
|
|
|
|
|
|
|
|
if len(ids) > 0 {
|
|
|
|
for _, id := range ids {
|
|
|
|
if err := callback(f.connectedMap[id], id); err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
for _, c := range f.connectedMap {
|
|
|
|
if err := callback(c, c.id); err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// setDefaultFactors sets the default price factors applied to subsequently connected clients
|
|
|
|
func (f *clientPool) setDefaultFactors(posFactors, negFactors priceFactors) {
|
|
|
|
f.lock.Lock()
|
|
|
|
defer f.lock.Unlock()
|
|
|
|
|
|
|
|
f.defaultPosFactors = posFactors
|
|
|
|
f.defaultNegFactors = negFactors
|
|
|
|
}
|
|
|
|
|
2020-07-21 08:23:40 +00:00
|
|
|
// setConnectedBias sets the connection bias, which is applied to already connected clients
|
|
|
|
// So that already connected client won't be kicked out very soon and we can ensure all
|
|
|
|
// connected clients can have enough time to request or sync some data.
|
|
|
|
func (f *clientPool) setConnectedBias(bias time.Duration) {
|
|
|
|
f.lock.Lock()
|
|
|
|
defer f.lock.Unlock()
|
|
|
|
|
|
|
|
f.connectedBias = bias
|
|
|
|
}
|
|
|
|
|
2019-08-03 12:36:10 +00:00
|
|
|
// dropClient removes a client from the connected queue and finalizes its balance.
|
|
|
|
// If kick is true then it also initiates the disconnection.
|
|
|
|
func (f *clientPool) dropClient(e *clientInfo, now mclock.AbsTime, kick bool) {
|
|
|
|
if _, ok := f.connectedMap[e.id]; !ok {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
f.finalizeBalance(e, now)
|
|
|
|
f.connectedQueue.Remove(e.queueIndex)
|
|
|
|
delete(f.connectedMap, e.id)
|
2019-11-02 12:02:35 +00:00
|
|
|
f.connectedCap -= e.capacity
|
2019-11-13 22:47:03 +00:00
|
|
|
if e.priority {
|
|
|
|
f.priorityConnected -= e.capacity
|
|
|
|
}
|
2019-11-02 12:02:35 +00:00
|
|
|
totalConnectedGauge.Update(int64(f.connectedCap))
|
2019-08-03 12:36:10 +00:00
|
|
|
if kick {
|
|
|
|
clientKickedMeter.Mark(1)
|
|
|
|
log.Debug("Client kicked out", "address", e.address)
|
|
|
|
f.removePeer(e.id)
|
|
|
|
} else {
|
|
|
|
clientDisconnectedMeter.Mark(1)
|
|
|
|
log.Debug("Client disconnected", "address", e.address)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-11-13 22:47:03 +00:00
|
|
|
// capacityInfo returns the total capacity allowance, the total capacity of connected
|
|
|
|
// clients and the total capacity of connected and prioritized clients
|
|
|
|
func (f *clientPool) capacityInfo() (uint64, uint64, uint64) {
|
|
|
|
f.lock.Lock()
|
|
|
|
defer f.lock.Unlock()
|
|
|
|
|
|
|
|
return f.capLimit, f.connectedCap, f.priorityConnected
|
|
|
|
}
|
|
|
|
|
2019-08-03 12:36:10 +00:00
|
|
|
// finalizeBalance stops the balance tracker, retrieves the final balances and
|
|
|
|
// stores them in posBalanceQueue and negBalanceQueue
|
|
|
|
func (f *clientPool) finalizeBalance(c *clientInfo, now mclock.AbsTime) {
|
|
|
|
c.balanceTracker.stop(now)
|
|
|
|
pos, neg := c.balanceTracker.getBalance(now)
|
2019-11-02 12:02:35 +00:00
|
|
|
|
|
|
|
pb, nb := f.ndb.getOrNewPB(c.id), f.ndb.getOrNewNB(c.address)
|
2019-08-03 12:36:10 +00:00
|
|
|
pb.value = pos
|
2019-11-02 12:02:35 +00:00
|
|
|
f.ndb.setPB(c.id, pb)
|
|
|
|
|
|
|
|
neg /= uint64(time.Second) // Convert the expanse to second level.
|
|
|
|
if neg > 1 {
|
|
|
|
nb.logValue = int64(math.Log(float64(neg))*fixedPointMultiplier) + f.logOffset(now)
|
|
|
|
f.ndb.setNB(c.address, nb)
|
|
|
|
} else {
|
|
|
|
f.ndb.delNB(c.address) // Negative balance is small enough, drop it directly.
|
2019-08-03 12:36:10 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// balanceExhausted callback is called by balanceTracker when positive balance is exhausted.
|
|
|
|
// It revokes priority status and also reduces the client capacity if necessary.
|
|
|
|
func (f *clientPool) balanceExhausted(id enode.ID) {
|
|
|
|
f.lock.Lock()
|
|
|
|
defer f.lock.Unlock()
|
|
|
|
|
|
|
|
c := f.connectedMap[id]
|
|
|
|
if c == nil || !c.priority {
|
|
|
|
return
|
|
|
|
}
|
2019-11-13 22:47:03 +00:00
|
|
|
if c.priority {
|
|
|
|
f.priorityConnected -= c.capacity
|
|
|
|
}
|
2019-08-03 12:36:10 +00:00
|
|
|
c.priority = false
|
|
|
|
if c.capacity != f.freeClientCap {
|
2019-11-02 12:02:35 +00:00
|
|
|
f.connectedCap += f.freeClientCap - c.capacity
|
|
|
|
totalConnectedGauge.Update(int64(f.connectedCap))
|
2019-08-03 12:36:10 +00:00
|
|
|
c.capacity = f.freeClientCap
|
2019-11-13 22:47:03 +00:00
|
|
|
c.balanceTracker.setCapacity(c.capacity)
|
2019-08-03 12:36:10 +00:00
|
|
|
c.peer.updateCapacity(c.capacity)
|
|
|
|
}
|
2019-11-13 22:47:03 +00:00
|
|
|
pb := f.ndb.getOrNewPB(id)
|
|
|
|
pb.value = 0
|
|
|
|
f.ndb.setPB(id, pb)
|
2019-08-03 12:36:10 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// setConnLimit sets the maximum number and total capacity of connected clients,
|
|
|
|
// dropping some of them if necessary.
|
2019-11-02 12:02:35 +00:00
|
|
|
func (f *clientPool) setLimits(totalConn int, totalCap uint64) {
|
2019-08-03 12:36:10 +00:00
|
|
|
f.lock.Lock()
|
|
|
|
defer f.lock.Unlock()
|
|
|
|
|
2019-11-02 12:02:35 +00:00
|
|
|
f.connLimit = totalConn
|
|
|
|
f.capLimit = totalCap
|
|
|
|
if f.connectedCap > f.capLimit || f.connectedQueue.Size() > f.connLimit {
|
2019-09-17 13:28:41 +00:00
|
|
|
f.connectedQueue.MultiPop(func(data interface{}, priority int64) bool {
|
2019-11-02 12:02:35 +00:00
|
|
|
f.dropClient(data.(*clientInfo), mclock.Now(), true)
|
|
|
|
return f.connectedCap > f.capLimit || f.connectedQueue.Size() > f.connLimit
|
2019-09-17 13:28:41 +00:00
|
|
|
})
|
|
|
|
}
|
2019-08-03 12:36:10 +00:00
|
|
|
}
|
|
|
|
|
2019-11-13 22:47:03 +00:00
|
|
|
// setCapacity sets the assigned capacity of a connected client
|
|
|
|
func (f *clientPool) setCapacity(c *clientInfo, capacity uint64) error {
|
|
|
|
if f.connectedMap[c.id] != c {
|
|
|
|
return fmt.Errorf("client %064x is not connected", c.id[:])
|
|
|
|
}
|
|
|
|
if c.capacity == capacity {
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
if !c.priority {
|
|
|
|
return errNoPriority
|
|
|
|
}
|
|
|
|
oldCapacity := c.capacity
|
|
|
|
c.capacity = capacity
|
|
|
|
f.connectedCap += capacity - oldCapacity
|
|
|
|
c.balanceTracker.setCapacity(capacity)
|
|
|
|
f.connectedQueue.Update(c.queueIndex)
|
|
|
|
if f.connectedCap > f.capLimit {
|
|
|
|
var kickList []*clientInfo
|
|
|
|
kick := true
|
|
|
|
f.connectedQueue.MultiPop(func(data interface{}, priority int64) bool {
|
|
|
|
client := data.(*clientInfo)
|
|
|
|
kickList = append(kickList, client)
|
|
|
|
f.connectedCap -= client.capacity
|
|
|
|
if client == c {
|
|
|
|
kick = false
|
|
|
|
}
|
|
|
|
return kick && (f.connectedCap > f.capLimit)
|
|
|
|
})
|
|
|
|
if kick {
|
|
|
|
now := mclock.Now()
|
|
|
|
for _, c := range kickList {
|
|
|
|
f.dropClient(c, now, true)
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
c.capacity = oldCapacity
|
|
|
|
c.balanceTracker.setCapacity(oldCapacity)
|
|
|
|
for _, c := range kickList {
|
|
|
|
f.connectedCap += c.capacity
|
|
|
|
f.connectedQueue.Push(c)
|
|
|
|
}
|
|
|
|
return errNoPriority
|
|
|
|
}
|
|
|
|
}
|
|
|
|
totalConnectedGauge.Update(int64(f.connectedCap))
|
|
|
|
f.priorityConnected += capacity - oldCapacity
|
|
|
|
c.updatePriceFactors()
|
|
|
|
c.peer.updateCapacity(c.capacity)
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
2019-08-27 11:07:25 +00:00
|
|
|
// requestCost feeds request cost after serving a request from the given peer.
|
2020-02-26 09:41:24 +00:00
|
|
|
func (f *clientPool) requestCost(p *clientPeer, cost uint64) {
|
2019-08-27 11:07:25 +00:00
|
|
|
f.lock.Lock()
|
|
|
|
defer f.lock.Unlock()
|
|
|
|
|
|
|
|
info, exist := f.connectedMap[p.ID()]
|
|
|
|
if !exist || f.closed {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
info.balanceTracker.requestCost(cost)
|
|
|
|
}
|
|
|
|
|
2019-08-03 12:36:10 +00:00
|
|
|
// logOffset calculates the time-dependent offset for the logarithmic
|
|
|
|
// representation of negative balance
|
2019-11-02 12:02:35 +00:00
|
|
|
//
|
|
|
|
// From another point of view, the result returned by the function represents
|
|
|
|
// the total time that the clientpool is cumulatively running(total_hours/multiplier).
|
2019-08-03 12:36:10 +00:00
|
|
|
func (f *clientPool) logOffset(now mclock.AbsTime) int64 {
|
|
|
|
// Note: fixedPointMultiplier acts as a multiplier here; the reason for dividing the divisor
|
|
|
|
// is to avoid int64 overflow. We assume that int64(negBalanceExpTC) >> fixedPointMultiplier.
|
2019-11-02 12:02:35 +00:00
|
|
|
cumulativeTime := int64((time.Duration(now - f.startTime)) / (negBalanceExpTC / fixedPointMultiplier))
|
|
|
|
return f.cumulativeTime + cumulativeTime
|
2019-08-03 12:36:10 +00:00
|
|
|
}
|
|
|
|
|
2019-11-13 22:47:03 +00:00
|
|
|
// setClientPriceFactors sets the pricing factors for an individual connected client
|
|
|
|
func (c *clientInfo) updatePriceFactors() {
|
|
|
|
c.balanceTracker.setFactors(true, c.negFactors.timeFactor+float64(c.capacity)*c.negFactors.capacityFactor/1000000, c.negFactors.requestFactor)
|
|
|
|
c.balanceTracker.setFactors(false, c.posFactors.timeFactor+float64(c.capacity)*c.posFactors.capacityFactor/1000000, c.posFactors.requestFactor)
|
|
|
|
}
|
|
|
|
|
|
|
|
// getPosBalance retrieves a single positive balance entry from cache or the database
|
|
|
|
func (f *clientPool) getPosBalance(id enode.ID) posBalance {
|
2019-08-03 12:36:10 +00:00
|
|
|
f.lock.Lock()
|
|
|
|
defer f.lock.Unlock()
|
|
|
|
|
2019-11-13 22:47:03 +00:00
|
|
|
return f.ndb.getOrNewPB(id)
|
2019-08-03 12:36:10 +00:00
|
|
|
}
|
|
|
|
|
2019-11-18 11:42:49 +00:00
|
|
|
// addBalance updates the balance of a client (either overwrites it or adds to it).
|
2019-11-13 22:47:03 +00:00
|
|
|
// It also updates the balance meta info string.
|
2019-11-18 11:42:49 +00:00
|
|
|
func (f *clientPool) addBalance(id enode.ID, amount int64, meta string) (uint64, uint64, error) {
|
2019-08-03 12:36:10 +00:00
|
|
|
f.lock.Lock()
|
|
|
|
defer f.lock.Unlock()
|
|
|
|
|
2019-11-02 12:02:35 +00:00
|
|
|
pb := f.ndb.getOrNewPB(id)
|
2019-11-13 22:47:03 +00:00
|
|
|
var negBalance uint64
|
2019-08-03 12:36:10 +00:00
|
|
|
c := f.connectedMap[id]
|
|
|
|
if c != nil {
|
2019-11-13 22:47:03 +00:00
|
|
|
pb.value, negBalance = c.balanceTracker.getBalance(f.clock.Now())
|
2019-08-03 12:36:10 +00:00
|
|
|
}
|
2019-11-13 22:47:03 +00:00
|
|
|
oldBalance := pb.value
|
|
|
|
if amount > 0 {
|
|
|
|
if amount > maxBalance || pb.value > maxBalance-uint64(amount) {
|
|
|
|
return oldBalance, oldBalance, errBalanceOverflow
|
2019-08-03 12:36:10 +00:00
|
|
|
}
|
2019-11-13 22:47:03 +00:00
|
|
|
pb.value += uint64(amount)
|
2019-08-03 12:36:10 +00:00
|
|
|
} else {
|
2019-11-13 22:47:03 +00:00
|
|
|
if uint64(-amount) > pb.value {
|
|
|
|
pb.value = 0
|
|
|
|
} else {
|
|
|
|
pb.value -= uint64(-amount)
|
|
|
|
}
|
2019-08-03 12:36:10 +00:00
|
|
|
}
|
2019-11-13 22:47:03 +00:00
|
|
|
pb.meta = meta
|
2019-11-02 12:02:35 +00:00
|
|
|
f.ndb.setPB(id, pb)
|
2019-11-13 22:47:03 +00:00
|
|
|
if c != nil {
|
|
|
|
c.balanceTracker.setBalance(pb.value, negBalance)
|
|
|
|
if !c.priority && pb.value > 0 {
|
|
|
|
// The capacity should be adjusted based on the requirement,
|
|
|
|
// but we have no idea about the new capacity, need a second
|
2020-05-25 08:21:28 +00:00
|
|
|
// call to update it.
|
2019-11-13 22:47:03 +00:00
|
|
|
c.priority = true
|
|
|
|
f.priorityConnected += c.capacity
|
|
|
|
c.balanceTracker.addCallback(balanceCallbackZero, 0, func() { f.balanceExhausted(id) })
|
|
|
|
}
|
|
|
|
// if balance is set to zero then reverting to non-priority status
|
|
|
|
// is handled by the balanceExhausted callback
|
|
|
|
c.balanceMetaInfo = meta
|
|
|
|
}
|
|
|
|
return oldBalance, pb.value, nil
|
2019-08-03 12:36:10 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// posBalance represents a recently accessed positive balance entry
|
|
|
|
type posBalance struct {
|
2019-11-13 22:47:03 +00:00
|
|
|
value uint64
|
|
|
|
meta string
|
2019-08-03 12:36:10 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// EncodeRLP implements rlp.Encoder
|
|
|
|
func (e *posBalance) EncodeRLP(w io.Writer) error {
|
2019-11-13 22:47:03 +00:00
|
|
|
return rlp.Encode(w, []interface{}{e.value, e.meta})
|
2019-08-03 12:36:10 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// DecodeRLP implements rlp.Decoder
|
|
|
|
func (e *posBalance) DecodeRLP(s *rlp.Stream) error {
|
|
|
|
var entry struct {
|
2019-11-13 22:47:03 +00:00
|
|
|
Value uint64
|
|
|
|
Meta string
|
2019-08-03 12:36:10 +00:00
|
|
|
}
|
|
|
|
if err := s.Decode(&entry); err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
e.value = entry.Value
|
2019-11-13 22:47:03 +00:00
|
|
|
e.meta = entry.Meta
|
2019-08-03 12:36:10 +00:00
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// negBalance represents a negative balance entry of a disconnected client
|
2019-11-02 12:02:35 +00:00
|
|
|
type negBalance struct{ logValue int64 }
|
2019-08-03 12:36:10 +00:00
|
|
|
|
|
|
|
// EncodeRLP implements rlp.Encoder
|
|
|
|
func (e *negBalance) EncodeRLP(w io.Writer) error {
|
2019-11-02 12:02:35 +00:00
|
|
|
return rlp.Encode(w, []interface{}{uint64(e.logValue)})
|
2019-08-03 12:36:10 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// DecodeRLP implements rlp.Decoder
|
|
|
|
func (e *negBalance) DecodeRLP(s *rlp.Stream) error {
|
|
|
|
var entry struct {
|
|
|
|
LogValue uint64
|
|
|
|
}
|
|
|
|
if err := s.Decode(&entry); err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
e.logValue = int64(entry.LogValue)
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
2019-11-02 12:02:35 +00:00
|
|
|
const (
|
|
|
|
// nodeDBVersion is the version identifier of the node data in db
|
2019-11-13 22:47:03 +00:00
|
|
|
//
|
|
|
|
// Changelog:
|
|
|
|
// * Replace `lastTotal` with `meta` in positive balance: version 0=>1
|
|
|
|
nodeDBVersion = 1
|
2019-11-02 12:02:35 +00:00
|
|
|
|
|
|
|
// dbCleanupCycle is the cycle of db for useless data cleanup
|
|
|
|
dbCleanupCycle = time.Hour
|
|
|
|
)
|
|
|
|
|
|
|
|
var (
|
|
|
|
positiveBalancePrefix = []byte("pb:") // dbVersion(uint16 big endian) + positiveBalancePrefix + id -> balance
|
|
|
|
negativeBalancePrefix = []byte("nb:") // dbVersion(uint16 big endian) + negativeBalancePrefix + ip -> balance
|
|
|
|
cumulativeRunningTimeKey = []byte("cumulativeTime:") // dbVersion(uint16 big endian) + cumulativeRunningTimeKey -> cumulativeTime
|
|
|
|
)
|
|
|
|
|
|
|
|
type nodeDB struct {
|
|
|
|
db ethdb.Database
|
|
|
|
pcache *lru.Cache
|
|
|
|
ncache *lru.Cache
|
|
|
|
auxbuf []byte // 37-byte auxiliary buffer for key encoding
|
|
|
|
verbuf [2]byte // 2-byte auxiliary buffer for db version
|
|
|
|
nbEvictCallBack func(mclock.AbsTime, negBalance) bool // Callback to determine whether the negative balance can be evicted.
|
|
|
|
clock mclock.Clock
|
|
|
|
closeCh chan struct{}
|
|
|
|
cleanupHook func() // Test hook used for testing
|
|
|
|
}
|
|
|
|
|
|
|
|
func newNodeDB(db ethdb.Database, clock mclock.Clock) *nodeDB {
|
|
|
|
pcache, _ := lru.New(posBalanceCacheLimit)
|
|
|
|
ncache, _ := lru.New(negBalanceCacheLimit)
|
|
|
|
ndb := &nodeDB{
|
|
|
|
db: db,
|
|
|
|
pcache: pcache,
|
|
|
|
ncache: ncache,
|
|
|
|
auxbuf: make([]byte, 37),
|
|
|
|
clock: clock,
|
|
|
|
closeCh: make(chan struct{}),
|
|
|
|
}
|
|
|
|
binary.BigEndian.PutUint16(ndb.verbuf[:], uint16(nodeDBVersion))
|
|
|
|
go ndb.expirer()
|
|
|
|
return ndb
|
|
|
|
}
|
|
|
|
|
|
|
|
func (db *nodeDB) close() {
|
|
|
|
close(db.closeCh)
|
|
|
|
}
|
|
|
|
|
2020-04-15 11:08:53 +00:00
|
|
|
func (db *nodeDB) getPrefix(neg bool) []byte {
|
|
|
|
prefix := positiveBalancePrefix
|
|
|
|
if neg {
|
|
|
|
prefix = negativeBalancePrefix
|
|
|
|
}
|
|
|
|
return append(db.verbuf[:], prefix...)
|
|
|
|
}
|
|
|
|
|
2019-11-02 12:02:35 +00:00
|
|
|
func (db *nodeDB) key(id []byte, neg bool) []byte {
|
|
|
|
prefix := positiveBalancePrefix
|
|
|
|
if neg {
|
|
|
|
prefix = negativeBalancePrefix
|
|
|
|
}
|
|
|
|
if len(prefix)+len(db.verbuf)+len(id) > len(db.auxbuf) {
|
|
|
|
db.auxbuf = append(db.auxbuf, make([]byte, len(prefix)+len(db.verbuf)+len(id)-len(db.auxbuf))...)
|
|
|
|
}
|
|
|
|
copy(db.auxbuf[:len(db.verbuf)], db.verbuf[:])
|
|
|
|
copy(db.auxbuf[len(db.verbuf):len(db.verbuf)+len(prefix)], prefix)
|
|
|
|
copy(db.auxbuf[len(prefix)+len(db.verbuf):len(prefix)+len(db.verbuf)+len(id)], id)
|
|
|
|
return db.auxbuf[:len(prefix)+len(db.verbuf)+len(id)]
|
|
|
|
}
|
|
|
|
|
|
|
|
func (db *nodeDB) getCumulativeTime() int64 {
|
|
|
|
blob, err := db.db.Get(append(cumulativeRunningTimeKey, db.verbuf[:]...))
|
|
|
|
if err != nil || len(blob) == 0 {
|
|
|
|
return 0
|
|
|
|
}
|
|
|
|
return int64(binary.BigEndian.Uint64(blob))
|
|
|
|
}
|
|
|
|
|
|
|
|
func (db *nodeDB) setCumulativeTime(v int64) {
|
|
|
|
binary.BigEndian.PutUint64(db.auxbuf[:8], uint64(v))
|
|
|
|
db.db.Put(append(cumulativeRunningTimeKey, db.verbuf[:]...), db.auxbuf[:8])
|
|
|
|
}
|
|
|
|
|
|
|
|
func (db *nodeDB) getOrNewPB(id enode.ID) posBalance {
|
|
|
|
key := db.key(id.Bytes(), false)
|
|
|
|
item, exist := db.pcache.Get(string(key))
|
|
|
|
if exist {
|
|
|
|
return item.(posBalance)
|
|
|
|
}
|
|
|
|
var balance posBalance
|
|
|
|
if enc, err := db.db.Get(key); err == nil {
|
|
|
|
if err := rlp.DecodeBytes(enc, &balance); err != nil {
|
|
|
|
log.Error("Failed to decode positive balance", "err", err)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
db.pcache.Add(string(key), balance)
|
|
|
|
return balance
|
|
|
|
}
|
|
|
|
|
|
|
|
func (db *nodeDB) setPB(id enode.ID, b posBalance) {
|
2019-11-13 22:47:03 +00:00
|
|
|
if b.value == 0 && len(b.meta) == 0 {
|
|
|
|
db.delPB(id)
|
|
|
|
return
|
|
|
|
}
|
2019-11-02 12:02:35 +00:00
|
|
|
key := db.key(id.Bytes(), false)
|
|
|
|
enc, err := rlp.EncodeToBytes(&(b))
|
|
|
|
if err != nil {
|
|
|
|
log.Error("Failed to encode positive balance", "err", err)
|
|
|
|
return
|
|
|
|
}
|
|
|
|
db.db.Put(key, enc)
|
|
|
|
db.pcache.Add(string(key), b)
|
|
|
|
}
|
|
|
|
|
|
|
|
func (db *nodeDB) delPB(id enode.ID) {
|
|
|
|
key := db.key(id.Bytes(), false)
|
|
|
|
db.db.Delete(key)
|
|
|
|
db.pcache.Remove(string(key))
|
|
|
|
}
|
|
|
|
|
2019-11-13 22:47:03 +00:00
|
|
|
// getPosBalanceIDs returns a lexicographically ordered list of IDs of accounts
|
|
|
|
// with a positive balance
|
|
|
|
func (db *nodeDB) getPosBalanceIDs(start, stop enode.ID, maxCount int) (result []enode.ID) {
|
|
|
|
if maxCount <= 0 {
|
|
|
|
return
|
|
|
|
}
|
2020-04-15 11:08:53 +00:00
|
|
|
prefix := db.getPrefix(false)
|
|
|
|
it := db.db.NewIterator(prefix, start.Bytes())
|
2019-11-13 22:47:03 +00:00
|
|
|
defer it.Release()
|
|
|
|
for i := len(stop[:]) - 1; i >= 0; i-- {
|
|
|
|
stop[i]--
|
|
|
|
if stop[i] != 255 {
|
|
|
|
break
|
|
|
|
}
|
|
|
|
}
|
|
|
|
stopKey := db.key(stop.Bytes(), false)
|
|
|
|
keyLen := len(stopKey)
|
|
|
|
|
|
|
|
for it.Next() {
|
|
|
|
var id enode.ID
|
|
|
|
if len(it.Key()) != keyLen || bytes.Compare(it.Key(), stopKey) == 1 {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
copy(id[:], it.Key()[keyLen-len(id):])
|
|
|
|
result = append(result, id)
|
|
|
|
if len(result) == maxCount {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
2019-11-02 12:02:35 +00:00
|
|
|
func (db *nodeDB) getOrNewNB(id string) negBalance {
|
|
|
|
key := db.key([]byte(id), true)
|
|
|
|
item, exist := db.ncache.Get(string(key))
|
|
|
|
if exist {
|
|
|
|
return item.(negBalance)
|
|
|
|
}
|
|
|
|
var balance negBalance
|
|
|
|
if enc, err := db.db.Get(key); err == nil {
|
|
|
|
if err := rlp.DecodeBytes(enc, &balance); err != nil {
|
|
|
|
log.Error("Failed to decode negative balance", "err", err)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
db.ncache.Add(string(key), balance)
|
|
|
|
return balance
|
|
|
|
}
|
|
|
|
|
|
|
|
func (db *nodeDB) setNB(id string, b negBalance) {
|
|
|
|
key := db.key([]byte(id), true)
|
|
|
|
enc, err := rlp.EncodeToBytes(&(b))
|
|
|
|
if err != nil {
|
|
|
|
log.Error("Failed to encode negative balance", "err", err)
|
|
|
|
return
|
|
|
|
}
|
|
|
|
db.db.Put(key, enc)
|
|
|
|
db.ncache.Add(string(key), b)
|
|
|
|
}
|
|
|
|
|
|
|
|
func (db *nodeDB) delNB(id string) {
|
|
|
|
key := db.key([]byte(id), true)
|
|
|
|
db.db.Delete(key)
|
|
|
|
db.ncache.Remove(string(key))
|
|
|
|
}
|
|
|
|
|
|
|
|
func (db *nodeDB) expirer() {
|
|
|
|
for {
|
|
|
|
select {
|
|
|
|
case <-db.clock.After(dbCleanupCycle):
|
|
|
|
db.expireNodes()
|
|
|
|
case <-db.closeCh:
|
|
|
|
return
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// expireNodes iterates the whole node db and checks whether the negative balance
|
|
|
|
// entry can deleted.
|
|
|
|
//
|
|
|
|
// The rationale behind this is: server doesn't need to keep the negative balance
|
|
|
|
// records if they are low enough.
|
|
|
|
func (db *nodeDB) expireNodes() {
|
|
|
|
var (
|
|
|
|
visited int
|
|
|
|
deleted int
|
|
|
|
start = time.Now()
|
2020-04-15 11:08:53 +00:00
|
|
|
prefix = db.getPrefix(true)
|
2019-11-02 12:02:35 +00:00
|
|
|
)
|
2020-04-15 11:08:53 +00:00
|
|
|
iter := db.db.NewIterator(prefix, nil)
|
2019-11-02 12:02:35 +00:00
|
|
|
for iter.Next() {
|
|
|
|
visited += 1
|
|
|
|
var balance negBalance
|
|
|
|
if err := rlp.DecodeBytes(iter.Value(), &balance); err != nil {
|
|
|
|
log.Error("Failed to decode negative balance", "err", err)
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
if db.nbEvictCallBack != nil && db.nbEvictCallBack(db.clock.Now(), balance) {
|
|
|
|
deleted += 1
|
|
|
|
db.db.Delete(iter.Key())
|
|
|
|
}
|
|
|
|
}
|
|
|
|
// Invoke testing hook if it's not nil.
|
|
|
|
if db.cleanupHook != nil {
|
|
|
|
db.cleanupHook()
|
|
|
|
}
|
|
|
|
log.Debug("Expire nodes", "visited", visited, "deleted", deleted, "elapsed", common.PrettyDuration(time.Since(start)))
|
2019-08-03 12:36:10 +00:00
|
|
|
}
|