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simtimer.go
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simtimer.go
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// Copyright Contributors to the Mir project
//
// SPDX-License-Identifier: Apache-2.0
package deploytest
import (
"context"
"fmt"
"time"
"github.com/filecoin-project/mir/pkg/events"
"github.com/filecoin-project/mir/pkg/modules"
"github.com/filecoin-project/mir/pkg/pb/eventpb"
"github.com/filecoin-project/mir/pkg/testsim"
t "github.com/filecoin-project/mir/pkg/types"
)
type simTimerModule struct {
*SimNode
eventsOut chan *events.EventList
processes map[t.RetentionIndex]*testsim.Process
}
// NewSimTimerModule returns a Timer modules to be used in simulation.
func NewSimTimerModule(node *SimNode) modules.ActiveModule {
return &simTimerModule{
SimNode: node,
eventsOut: make(chan *events.EventList, 1),
processes: map[t.RetentionIndex]*testsim.Process{},
}
}
func (m *simTimerModule) ImplementsModule() {}
func (m *simTimerModule) EventsOut() <-chan *events.EventList {
return m.eventsOut
}
func (m *simTimerModule) ApplyEvents(ctx context.Context, eventList *events.EventList) error {
_, err := modules.ApplyEventsSequentially(eventList, func(e *eventpb.Event) (*events.EventList, error) {
return events.EmptyList(), m.applyEvent(ctx, e)
})
return err
}
func (m *simTimerModule) applyEvent(ctx context.Context, e *eventpb.Event) error {
switch e := e.Type.(type) {
case *eventpb.Event_Init:
// no actions on init
case *eventpb.Event_TimerDelay:
eventsOut := events.EmptyList().PushBackSlice(e.TimerDelay.Events)
d := t.TimeDuration(e.TimerDelay.Delay)
m.delay(ctx, eventsOut, d)
case *eventpb.Event_TimerRepeat:
eventsOut := events.EmptyList().PushBackSlice(e.TimerRepeat.Events)
d := t.TimeDuration(e.TimerRepeat.Delay)
retIdx := t.RetentionIndex(e.TimerRepeat.RetentionIndex)
m.repeat(ctx, eventsOut, d, retIdx)
case *eventpb.Event_TimerGarbageCollect:
retIdx := t.RetentionIndex(e.TimerGarbageCollect.RetentionIndex)
m.garbageCollect(retIdx)
default:
return fmt.Errorf("unexpected type of Timer event: %T", e)
}
return nil
}
func (m *simTimerModule) delay(ctx context.Context, eventList *events.EventList, d t.TimeDuration) {
proc := m.Spawn()
done := make(chan struct{})
go func() {
select {
case <-ctx.Done():
proc.Kill()
case <-done:
}
}()
go func() {
defer close(done)
if !proc.Delay(time.Duration(d)) {
return
}
select {
case eventsOut := <-m.eventsOut:
eventsOut.PushBackList(eventList)
m.eventsOut <- eventsOut
default:
m.eventsOut <- eventList
}
m.SimNode.SendEvents(proc, eventList)
proc.Exit()
}()
}
func (m *simTimerModule) repeat(ctx context.Context, eventList *events.EventList, d t.TimeDuration, retIdx t.RetentionIndex) {
proc := m.Spawn()
m.processes[retIdx] = proc
done := make(chan struct{})
go func() {
select {
case <-ctx.Done():
proc.Kill()
case <-done:
}
}()
go func() {
defer close(done)
for {
if !proc.Delay(time.Duration(d)) {
return
}
select {
case eventsOut := <-m.eventsOut:
eventsOut.PushBackList(eventList)
m.eventsOut <- eventsOut
default:
m.eventsOut <- eventList
}
m.SimNode.SendEvents(proc, eventList)
}
}()
}
func (m *simTimerModule) garbageCollect(retIdx t.RetentionIndex) {
for i, proc := range m.processes {
if i < retIdx {
proc.Kill()
delete(m.processes, i)
}
}
}