mirror of https://github.com/poanetwork/quorum.git
173 lines
4.1 KiB
Go
173 lines
4.1 KiB
Go
// Copyright 2016 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 flowcontrol implements a client side flow control mechanism
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package flowcontrol
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import (
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/common/mclock"
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)
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const fcTimeConst = 1000000
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type ServerParams struct {
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BufLimit, MinRecharge uint64
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}
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type ClientNode struct {
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params *ServerParams
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bufValue uint64
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lastTime int64
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lock sync.Mutex
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cm *ClientManager
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cmNode *cmNode
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}
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func NewClientNode(cm *ClientManager, params *ServerParams) *ClientNode {
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node := &ClientNode{
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cm: cm,
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params: params,
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bufValue: params.BufLimit,
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lastTime: getTime(),
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}
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node.cmNode = cm.addNode(node)
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return node
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}
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func (peer *ClientNode) Remove(cm *ClientManager) {
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cm.removeNode(peer.cmNode)
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}
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func (peer *ClientNode) recalcBV(time int64) {
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dt := uint64(time - peer.lastTime)
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if time < peer.lastTime {
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dt = 0
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}
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peer.bufValue += peer.params.MinRecharge * dt / fcTimeConst
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if peer.bufValue > peer.params.BufLimit {
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peer.bufValue = peer.params.BufLimit
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}
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peer.lastTime = time
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}
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func (peer *ClientNode) AcceptRequest() (uint64, bool) {
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peer.lock.Lock()
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defer peer.lock.Unlock()
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time := getTime()
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peer.recalcBV(time)
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return peer.bufValue, peer.cm.accept(peer.cmNode, time)
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}
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func (peer *ClientNode) RequestProcessed(cost uint64) (bv, realCost uint64) {
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peer.lock.Lock()
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defer peer.lock.Unlock()
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time := getTime()
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peer.recalcBV(time)
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peer.bufValue -= cost
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peer.recalcBV(time)
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rcValue, rcost := peer.cm.processed(peer.cmNode, time)
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if rcValue < peer.params.BufLimit {
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bv := peer.params.BufLimit - rcValue
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if bv > peer.bufValue {
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peer.bufValue = bv
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}
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}
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return peer.bufValue, rcost
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}
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type ServerNode struct {
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bufEstimate uint64
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lastTime int64
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params *ServerParams
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sumCost uint64 // sum of req costs sent to this server
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pending map[uint64]uint64 // value = sumCost after sending the given req
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lock sync.Mutex
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}
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func NewServerNode(params *ServerParams) *ServerNode {
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return &ServerNode{
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bufEstimate: params.BufLimit,
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lastTime: getTime(),
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params: params,
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pending: make(map[uint64]uint64),
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}
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}
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func getTime() int64 {
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return int64(mclock.Now())
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}
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func (peer *ServerNode) recalcBLE(time int64) {
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dt := uint64(time - peer.lastTime)
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if time < peer.lastTime {
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dt = 0
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}
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peer.bufEstimate += peer.params.MinRecharge * dt / fcTimeConst
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if peer.bufEstimate > peer.params.BufLimit {
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peer.bufEstimate = peer.params.BufLimit
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}
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peer.lastTime = time
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}
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func (peer *ServerNode) canSend(maxCost uint64) uint64 {
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if peer.bufEstimate >= maxCost {
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return 0
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}
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return (maxCost - peer.bufEstimate) * fcTimeConst / peer.params.MinRecharge
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}
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func (peer *ServerNode) CanSend(maxCost uint64) uint64 {
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peer.lock.Lock()
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defer peer.lock.Unlock()
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return peer.canSend(maxCost)
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}
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// blocks until request can be sent
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func (peer *ServerNode) SendRequest(reqID, maxCost uint64) {
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peer.lock.Lock()
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defer peer.lock.Unlock()
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peer.recalcBLE(getTime())
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for peer.bufEstimate < maxCost {
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time.Sleep(time.Duration(peer.canSend(maxCost)))
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peer.recalcBLE(getTime())
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}
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peer.bufEstimate -= maxCost
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peer.sumCost += maxCost
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if reqID >= 0 {
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peer.pending[reqID] = peer.sumCost
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}
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}
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func (peer *ServerNode) GotReply(reqID, bv uint64) {
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peer.lock.Lock()
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defer peer.lock.Unlock()
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sc, ok := peer.pending[reqID]
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if !ok {
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return
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}
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delete(peer.pending, reqID)
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peer.bufEstimate = bv - (peer.sumCost - sc)
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peer.lastTime = getTime()
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}
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