/
peering_net_behaviour_dynamic.go
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/
peering_net_behaviour_dynamic.go
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// Copyright 2020 IOTA Stiftung
// SPDX-License-Identifier: Apache-2.0
package testutil
// An interface providing some network behavior.
// It is used for testing network protocols in more realistic settings.
import (
"math/rand"
"sync"
"time"
"github.com/iotaledger/hive.go/logger"
"github.com/iotaledger/wasp/packages/cryptolib"
)
// peeringNetDynamic provides a behavior of a network with dynamically
// changeable working conditions. It works as peeringNetReliable without any
// handlers set.
type PeeringNetDynamic struct {
closeChs []chan bool
handlers []peeringNetDynamicHandlerEntry
mutex sync.RWMutex
log *logger.Logger
}
var _ PeeringNetBehavior = &PeeringNetDynamic{}
type peeringNetDynamicHandlerEntry struct {
id *string
peeringNetDynamicHandler
}
type peeringNetDynamicHandler interface {
handleSendMessage(
msg *peeringMsg,
dstPubKey *cryptolib.PublicKey,
nextHandlers []peeringNetDynamicHandlerEntry,
callHandlersAndSendFun func(nextHandlers []peeringNetDynamicHandlerEntry),
log *logger.Logger,
)
}
// NewPeeringNetDynamic constructs the PeeringNetBehavior.
func NewPeeringNetDynamic(log *logger.Logger) *PeeringNetDynamic {
return &PeeringNetDynamic{
closeChs: make([]chan bool, 0),
handlers: make([]peeringNetDynamicHandlerEntry, 0),
log: log,
}
}
func (pndT *PeeringNetDynamic) WithLosingChannel(id *string, deliveryProbability int) *PeeringNetDynamic {
pndT.addHandlerEntry(peeringNetDynamicHandlerEntry{
id,
&peeringNetDynamicHandlerLosingChannel{
probability: deliveryProbability,
},
})
return pndT
}
func (pndT *PeeringNetDynamic) WithRepeatingChannel(id *string, repeatProbability int) *PeeringNetDynamic {
pndT.addHandlerEntry(peeringNetDynamicHandlerEntry{
id,
&peeringNetDynamicHandlerRepeatingChannel{
probability: repeatProbability,
},
})
return pndT
}
func (pndT *PeeringNetDynamic) WithDelayingChannel(id *string, delayFrom, delayTill time.Duration) *PeeringNetDynamic {
pndT.addHandlerEntry(peeringNetDynamicHandlerEntry{
id,
&peeringNetDynamicHandlerDelayingChannel{
from: delayFrom,
till: delayTill,
},
})
return pndT
}
func (pndT *PeeringNetDynamic) WithPeerDisconnected(id *string, peerPubKey *cryptolib.PublicKey) *PeeringNetDynamic {
pndT.addHandlerEntry(peeringNetDynamicHandlerEntry{
id,
&peeringNetDynamicHandlerPeerDisconnected{
peerPubKey: peerPubKey,
},
})
return pndT
}
func (pndT *PeeringNetDynamic) addHandlerEntry(handler peeringNetDynamicHandlerEntry) {
pndT.mutex.Lock()
defer pndT.mutex.Unlock()
pndT.handlers = append(pndT.handlers, handler)
}
func (pndT *PeeringNetDynamic) RemoveHandler(id string) bool {
pndT.mutex.Lock()
defer pndT.mutex.Unlock()
var i int
for i = 0; i < len(pndT.handlers); i++ {
currentHandlerID := pndT.handlers[i].getID()
if (currentHandlerID != nil) && (*currentHandlerID == id) {
pndT.handlers = append(pndT.handlers[:i], pndT.handlers[i+1:]...)
return true
}
}
return false
}
// AddLink implements PeeringNetBehavior.
func (pndT *PeeringNetDynamic) AddLink(inCh, outCh chan *peeringMsg, dstPubKey *cryptolib.PublicKey) {
closeCh := make(chan bool)
pndT.closeChs = append(pndT.closeChs, closeCh)
go pndT.recvLoop(inCh, outCh, closeCh, dstPubKey)
}
// Close implements PeeringNetBehavior.
func (pndT *PeeringNetDynamic) Close() {
for i := range pndT.closeChs {
close(pndT.closeChs[i])
}
}
func (pndT *PeeringNetDynamic) recvLoop(inCh, outCh chan *peeringMsg, closeCh chan bool, dstPubKey *cryptolib.PublicKey) {
for {
select {
case <-closeCh:
return
case recv, ok := <-inCh:
if !ok {
return
}
var callHandlersAndSendFun func(nextHandlers []peeringNetDynamicHandlerEntry)
callHandlersAndSendFun = func(nextHandlers []peeringNetDynamicHandlerEntry) {
if len(nextHandlers) > 0 {
nextHandlers[0].handleSendMessage(recv, dstPubKey, nextHandlers[1:], callHandlersAndSendFun, pndT.log)
} else {
pndT.log.Debugf("Network delivers message %v -%v-> %v", recv.from.String(), recv.PeerMessageData().MsgType, dstPubKey.String())
safeSendPeeringMsg(outCh, recv, pndT.log)
}
}
pndT.mutex.RLock()
handlers := make([]peeringNetDynamicHandlerEntry, len(pndT.handlers))
copy(handlers, pndT.handlers)
pndT.mutex.RUnlock()
callHandlersAndSendFun(handlers)
}
}
}
func (pndheT *peeringNetDynamicHandlerEntry) getID() *string {
return pndheT.id
}
type peeringNetDynamicHandlerLosingChannel struct {
probability int // probability to deliver a message (in percents)
}
func (lcT *peeringNetDynamicHandlerLosingChannel) handleSendMessage(
msg *peeringMsg,
dstPubKey *cryptolib.PublicKey,
nextHandlers []peeringNetDynamicHandlerEntry,
callHandlersAndSendFun func(nextHandlers []peeringNetDynamicHandlerEntry),
log *logger.Logger,
) {
if rand.Intn(100) > lcT.probability {
log.Debugf("Network dropped message %v -%v-> %v", msg.from.String(), msg.PeerMessageData().MsgType, dstPubKey.String())
return
}
callHandlersAndSendFun(nextHandlers)
}
type peeringNetDynamicHandlerRepeatingChannel struct {
probability int // Probability to repeat a message (in percents), 0 meaning no repeat, 100 a certain repeat, 250 - 50% that message will be sent out three times and 50% - that four times
}
func (rcT *peeringNetDynamicHandlerRepeatingChannel) handleSendMessage(
msg *peeringMsg,
dstPubKey *cryptolib.PublicKey,
nextHandlers []peeringNetDynamicHandlerEntry,
callHandlersAndSendFun func(nextHandlers []peeringNetDynamicHandlerEntry),
log *logger.Logger,
) {
numRepeat := 1 + rcT.probability/100
if rand.Intn(100) < rcT.probability%100 {
numRepeat++
}
log.Debugf("Network repeated message %v -%v-> %v %v times", msg.from.String(), msg.PeerMessageData().MsgType, dstPubKey.String(), numRepeat)
for i := 0; i < numRepeat; i++ {
callHandlersAndSendFun(nextHandlers)
}
}
type peeringNetDynamicHandlerDelayingChannel struct {
from time.Duration
till time.Duration
}
func (dcT *peeringNetDynamicHandlerDelayingChannel) handleSendMessage(
msg *peeringMsg,
dstPubKey *cryptolib.PublicKey,
nextHandlers []peeringNetDynamicHandlerEntry,
callHandlersAndSendFun func(nextHandlers []peeringNetDynamicHandlerEntry),
log *logger.Logger,
) {
go func() {
fromMS := int(dcT.from.Milliseconds())
tillMS := int(dcT.till.Milliseconds())
var delay time.Duration
if tillMS > 0 {
if fromMS < tillMS {
delay = time.Duration(rand.Intn(tillMS-fromMS)+fromMS) * time.Millisecond
} else {
delay = time.Duration(fromMS) * time.Millisecond
}
log.Debugf("Network delayed message %v -%v-> %v for %v", msg.from.String(), msg.PeerMessageData().MsgType, dstPubKey.String(), delay)
<-time.After(delay)
}
callHandlersAndSendFun(nextHandlers)
}()
}
type peeringNetDynamicHandlerPeerDisconnected struct {
peerPubKey *cryptolib.PublicKey
}
func (pdT *peeringNetDynamicHandlerPeerDisconnected) handleSendMessage(
msg *peeringMsg,
dstPubKey *cryptolib.PublicKey,
nextHandlers []peeringNetDynamicHandlerEntry,
callHandlersAndSendFun func(nextHandlers []peeringNetDynamicHandlerEntry),
log *logger.Logger,
) {
if dstPubKey.Equals(pdT.peerPubKey) {
log.Debugf("Network dropped message %v -%v-> %v, because destination is disconnected", msg.from.String(), msg.PeerMessageData().MsgType, dstPubKey.String())
return
}
if msg.from.Equals(pdT.peerPubKey) {
log.Debugf("Network dropped message %v -%v-> %v, because source is disconnected", msg.from.String(), msg.PeerMessageData().MsgType, dstPubKey.String())
return
}
callHandlersAndSendFun(nextHandlers)
}