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package conntrack
import (
"context"
"math"
"strconv"
"sync"
"testing"
"time"
"github.com/stretchr/testify/assert"
_ "github.com/anacrolix/envpprof"
"github.com/bradfitz/iter"
)
func entry(id int) Entry {
return Entry{"", "", strconv.FormatInt(int64(id), 10)}
}
func TestWaitingForSameEntry(t *testing.T) {
i := NewInstance()
i.SetMaxEntries(1)
i.Timeout = func(Entry) time.Duration {
return 0
}
e1h1 := i.WaitDefault(context.Background(), entry(1))
gotE2s := make(chan struct{})
for range iter.N(2) {
go func() {
i.WaitDefault(context.Background(), entry(2))
gotE2s <- struct{}{}
}()
}
gotE1 := make(chan struct{})
var e1h2 *EntryHandle
go func() {
e1h2 = i.WaitDefault(context.Background(), entry(1))
gotE1 <- struct{}{}
}()
select {
case <-gotE1:
case <-gotE2s:
t.FailNow()
}
go e1h1.Done()
go e1h2.Done()
<-gotE2s
<-gotE2s
}
func TestInstanceSetNoMaxEntries(t *testing.T) {
i := NewInstance()
i.SetMaxEntries(0)
var wg sync.WaitGroup
wait := func(e Entry, p priority) {
i.Wait(context.Background(), e, "", p)
wg.Done()
}
for _, e := range []Entry{entry(0), entry(1)} {
for _, p := range []priority{math.MinInt32, math.MaxInt32} {
wg.Add(1)
go wait(e, p)
}
}
waitForNumWaiters := func(num int) {
i.mu.Lock()
for len(i.waiters) != num {
i.numWaitersChanged.Wait()
}
i.mu.Unlock()
}
waitForNumWaiters(4)
i.SetNoMaxEntries()
waitForNumWaiters(0)
wg.Wait()
}
func TestWaitReturnsNilContextCompleted(t *testing.T) {
i := NewInstance()
i.SetMaxEntries(0)
ctx, cancel := context.WithCancel(context.Background())
cancel()
assert.Nil(t, i.WaitDefault(ctx, entry(0)))
ctx, cancel = context.WithTimeout(context.Background(), 10*time.Millisecond)
assert.Nil(t, i.WaitDefault(ctx, entry(1)))
cancel()
}
func TestWaitContextCanceledButRoomForEntry(t *testing.T) {
i := NewInstance()
i.SetMaxEntries(1)
ctx, cancel := context.WithCancel(context.Background())
go cancel()
eh := i.WaitDefault(ctx, entry(0))
if eh == nil {
assert.Error(t, ctx.Err())
} else {
eh.Done()
}
}
func TestUnlimitedInstance(t *testing.T) {
i := NewInstance()
i.SetNoMaxEntries()
i.Timeout = func(Entry) time.Duration { return 0 }
eh := i.WaitDefault(context.Background(), entry(0))
assert.NotNil(t, eh)
i.mu.Lock()
assert.Len(t, i.entries[eh.e], 1)
i.mu.Unlock()
eh.Done()
i.mu.Lock()
assert.Nil(t, i.entries[eh.e])
i.mu.Unlock()
}
func TestUnlimitedInstanceContextCanceled(t *testing.T) {
i := NewInstance()
i.SetNoMaxEntries()
i.Timeout = func(Entry) time.Duration { return 0 }
ctx, cancel := context.WithCancel(context.Background())
cancel()
eh := i.WaitDefault(ctx, entry(0))
assert.NotNil(t, eh)
i.mu.Lock()
assert.Len(t, i.entries[eh.e], 1)
i.mu.Unlock()
eh.Done()
i.mu.Lock()
assert.Nil(t, i.entries[eh.e])
i.mu.Unlock()
}
func TestContextCancelledWhileWaiting(t *testing.T) {
i := NewInstance()
i.SetMaxEntries(0)
ctx, cancel := context.WithCancel(context.Background())
i.mu.Lock()
assert.Len(t, i.waiters, 0)
i.mu.Unlock()
waitReturned := make(chan struct{})
go func() {
eh := i.WaitDefault(ctx, entry(0))
assert.Nil(t, eh)
close(waitReturned)
}()
for {
i.mu.Lock()
if len(i.waiters) == 1 {
i.mu.Unlock()
break
}
i.mu.Unlock()
time.Sleep(time.Millisecond)
}
cancel()
<-waitReturned
assert.Len(t, i.entries, 0)
assert.Len(t, i.waiters, 0)
}
func TestRaceWakeAndContextCompletion(t *testing.T) {
i := NewInstance()
i.SetMaxEntries(1)
eh0 := i.WaitDefault(context.Background(), entry(0))
ctx, cancel := context.WithCancel(context.Background())
waitReturned := make(chan struct{})
go func() {
eh1 := i.WaitDefault(ctx, entry(1))
if eh1 != nil {
eh1.Forget()
}
close(waitReturned)
}()
go cancel()
go eh0.Forget()
<-waitReturned
cancel()
eh0.Forget()
i.mu.Lock()
assert.Len(t, i.entries, 0)
assert.Len(t, i.waiters, 0)
i.mu.Unlock()
}
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