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// Copyright (C) 2019-2023 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package fuzzer
import (
"encoding/json"
"fmt"
"github.com/algorand/go-algorand/protocol"
)
var _ = fmt.Printf
type ScheduleOperation int
const (
After ScheduleOperation = iota // 0
Before ScheduleOperation = iota // 1
Between ScheduleOperation = iota // 2
NotAfter ScheduleOperation = iota // 3
NotBefore ScheduleOperation = iota // 4
NotBetween ScheduleOperation = iota // 5
)
type SchedulerFilterSchedule struct {
FirstTick, SecondTick int
Operation ScheduleOperation
Nodes []int // which nodes would be affected
}
type SchedulerFilterConfig struct {
Filters []NetworkFilterFactory
Schedule []SchedulerFilterSchedule
ScheduleName string
DebugMessages bool
}
type SchedulerFilter struct {
NetworkFilter
upstream UpstreamFilter
downstream DownstreamFilter
enabled bool
nodeID int
filters []NetworkFilter
lastTick int
NetworkFilterFactory
factoryConfig *SchedulerFilterConfig
}
func (n *SchedulerFilter) SendMessage(sourceNode, targetNode int, tag protocol.Tag, data []byte) {
nextFilter := n.downstream
if n.enabled && len(n.filters) > 0 {
nextFilter = n.filters[0]
}
nextFilter.SendMessage(sourceNode, targetNode, tag, data)
}
func (n *SchedulerFilter) GetDownstreamFilter() DownstreamFilter {
return n.downstream
}
func (n *SchedulerFilter) ReceiveMessage(sourceNode int, tag protocol.Tag, data []byte) {
nextFilter := n.upstream
if n.enabled && len(n.filters) > 0 {
nextFilter = n.filters[len(n.filters)-1]
}
nextFilter.ReceiveMessage(sourceNode, tag, data)
}
func (n *SchedulerFilter) SetDownstreamFilter(f DownstreamFilter) {
n.downstream = f
if len(n.filters) > 0 {
n.filters[len(n.filters)-1].SetDownstreamFilter(f)
}
}
func (n *SchedulerFilter) SetUpstreamFilter(f UpstreamFilter) {
n.upstream = f
if len(n.filters) > 0 {
n.filters[0].SetUpstreamFilter(f)
}
}
func (n *SchedulerFilter) CreateFilter(nodeID int, fuzzer *Fuzzer) NetworkFilter {
f := &SchedulerFilter{
factoryConfig: n.factoryConfig,
nodeID: nodeID,
filters: make([]NetworkFilter, len(n.factoryConfig.Filters)),
}
for i, factory := range n.factoryConfig.Filters {
f.filters[i] = factory.CreateFilter(nodeID, fuzzer)
}
for i := 1; i < len(f.filters); i++ {
f.filters[i].SetUpstreamFilter(f.filters[i-1])
}
for i := 0; i < len(f.filters)-1; i++ {
f.filters[i].SetDownstreamFilter(f.filters[i+1])
}
f.Evaluate(0)
return f
}
func (n *SchedulerFilter) Tick(newClockTime int) bool {
deltaTick := newClockTime - n.lastTick
n.lastTick = newClockTime
n.Evaluate(newClockTime)
nextFilter := n.upstream
if n.enabled && len(n.filters) > 0 {
nextFilter = n.filters[len(n.filters)-1]
}
tickResult := nextFilter.Tick(newClockTime)
if tickResult {
return true
}
// return true if we're going to change state before the next tick.
for i := newClockTime + 1; i < newClockTime+deltaTick*2; i++ {
for _, schedule := range n.factoryConfig.Schedule {
if enabled := schedule.Evaluate(i, n.nodeID); enabled != n.enabled {
return true
}
}
}
return false
}
func MakeScheduleFilterFactory(config *SchedulerFilterConfig) *SchedulerFilter {
n := &SchedulerFilter{
factoryConfig: config,
}
return n
}
func (n *SchedulerFilter) Evaluate(timepoint int) {
enabled := false
for _, schedule := range n.factoryConfig.Schedule {
if enabled = schedule.Evaluate(timepoint, n.nodeID); enabled {
break
}
}
if n.enabled != enabled && n.factoryConfig.DebugMessages {
fmt.Printf("SchedulerFilter(%s) service-%v switch to %v at %v\n", n.factoryConfig.ScheduleName, n.nodeID, enabled, timepoint)
}
n.enabled = enabled
}
func (n *SchedulerFilterSchedule) Evaluate(timepoint int, nodeID int) bool {
// make sure nodeId is in Nodes
found := false
for _, node := range n.Nodes {
if node == nodeID {
found = true
}
}
if !found {
return false
}
switch n.Operation {
case After:
return n.FirstTick < timepoint
case Before:
return n.FirstTick > timepoint
case Between:
return (n.FirstTick < timepoint) && (n.SecondTick > timepoint)
case NotAfter:
return !(n.FirstTick < timepoint)
case NotBefore:
return !(n.FirstTick > timepoint)
case NotBetween:
return !((n.FirstTick < timepoint) && (n.SecondTick > timepoint))
default:
return false
}
}
// Unmarshall SchedulerFilter
func (n *SchedulerFilter) Unmarshal(b []byte) NetworkFilterFactory {
type schedulerFilterConfigJSON struct {
Name string
Filters []interface{}
Schedule []SchedulerFilterSchedule
ScheduleName string
}
var jsonConfig schedulerFilterConfigJSON
if err := json.Unmarshal(b, &jsonConfig); err != nil {
return nil
}
if jsonConfig.Name != "SchedulerFilter" {
return nil
}
filters := []NetworkFilterFactory{}
// generate a list of concrete filters
for _, fuzzerFilterData := range jsonConfig.Filters {
// convert the interface into a byte-stream.
filterConfig, err := json.Marshal(fuzzerFilterData)
if err != nil {
return nil
}
var filterFactory NetworkFilterFactory
for _, regFactory := range registeredFilterFactories {
filterFactory = regFactory.Unmarshal(filterConfig)
if filterFactory != nil {
// we found a filter factory!
break
}
}
if filterFactory == nil {
return nil
}
filters = append(filters, filterFactory)
}
sched := &SchedulerFilterConfig{
Filters: filters,
Schedule: jsonConfig.Schedule,
ScheduleName: jsonConfig.ScheduleName,
DebugMessages: false,
}
return MakeScheduleFilterFactory(sched)
}
// register SchedulerFilter
func init() {
registeredFilterFactories = append(registeredFilterFactories, &SchedulerFilter{})
}
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