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package pool
import (
"errors"
"fmt"
"math/rand"
"testing"
"time"
"github.com/rclone/rclone/fstest/testy"
"github.com/stretchr/testify/assert"
)
// makes the allocations be unreliable
func makeUnreliable(bp *Pool) {
bp.alloc = func(size int) ([]byte, error) {
if rand.Intn(3) != 0 {
return nil, errors.New("failed to allocate memory")
}
return make([]byte, size), nil
}
bp.free = func(b []byte) error {
if rand.Intn(3) != 0 {
return errors.New("failed to free memory")
}
return nil
}
}
func testGetPut(t *testing.T, useMmap bool, unreliable bool) {
bp := New(60*time.Second, 4096, 2, useMmap)
if unreliable {
makeUnreliable(bp)
}
assert.Equal(t, 0, bp.InUse())
b1 := bp.Get()
assert.Equal(t, 1, bp.InUse())
assert.Equal(t, 0, bp.InPool())
assert.Equal(t, 1, bp.Alloced())
b2 := bp.Get()
assert.Equal(t, 2, bp.InUse())
assert.Equal(t, 0, bp.InPool())
assert.Equal(t, 2, bp.Alloced())
b3 := bp.Get()
assert.Equal(t, 3, bp.InUse())
assert.Equal(t, 0, bp.InPool())
assert.Equal(t, 3, bp.Alloced())
bp.Put(b1)
assert.Equal(t, 2, bp.InUse())
assert.Equal(t, 1, bp.InPool())
assert.Equal(t, 3, bp.Alloced())
bp.Put(b2)
assert.Equal(t, 1, bp.InUse())
assert.Equal(t, 2, bp.InPool())
assert.Equal(t, 3, bp.Alloced())
bp.Put(b3)
assert.Equal(t, 0, bp.InUse())
assert.Equal(t, 2, bp.InPool())
assert.Equal(t, 2, bp.Alloced())
addr := func(b []byte) string {
return fmt.Sprintf("%p", &b[0])
}
b1a := bp.Get()
assert.Equal(t, addr(b2), addr(b1a))
assert.Equal(t, 1, bp.InUse())
assert.Equal(t, 1, bp.InPool())
assert.Equal(t, 2, bp.Alloced())
b2a := bp.Get()
assert.Equal(t, addr(b1), addr(b2a))
assert.Equal(t, 2, bp.InUse())
assert.Equal(t, 0, bp.InPool())
assert.Equal(t, 2, bp.Alloced())
bp.Put(b1a)
bp.Put(b2a)
assert.Equal(t, 0, bp.InUse())
assert.Equal(t, 2, bp.InPool())
assert.Equal(t, 2, bp.Alloced())
assert.Panics(t, func() {
bp.Put(make([]byte, 1))
})
bp.Flush()
assert.Equal(t, 0, bp.InUse())
assert.Equal(t, 0, bp.InPool())
assert.Equal(t, 0, bp.Alloced())
}
func testFlusher(t *testing.T, useMmap bool, unreliable bool) {
bp := New(50*time.Millisecond, 4096, 2, useMmap)
if unreliable {
makeUnreliable(bp)
}
b1 := bp.Get()
b2 := bp.Get()
b3 := bp.Get()
bp.Put(b1)
bp.Put(b2)
bp.Put(b3)
assert.Equal(t, 0, bp.InUse())
assert.Equal(t, 2, bp.InPool())
assert.Equal(t, 2, bp.Alloced())
bp.mu.Lock()
assert.Equal(t, 0, bp.minFill)
assert.Equal(t, true, bp.flushPending)
bp.mu.Unlock()
checkFlushHasHappened := func(desired int) {
var n int
for i := 0; i < 10; i++ {
time.Sleep(100 * time.Millisecond)
n = bp.InPool()
if n <= desired {
break
}
}
assert.Equal(t, desired, n)
}
checkFlushHasHappened(0)
assert.Equal(t, 0, bp.InUse())
assert.Equal(t, 0, bp.InPool())
assert.Equal(t, 0, bp.Alloced())
bp.mu.Lock()
assert.Equal(t, 0, bp.minFill)
assert.Equal(t, false, bp.flushPending)
bp.mu.Unlock()
// Now do manual aging to check it is working properly
bp = New(100*time.Second, 4096, 2, useMmap)
// Check the new one doesn't get flushed
b1 = bp.Get()
b2 = bp.Get()
bp.Put(b1)
bp.Put(b2)
bp.mu.Lock()
assert.Equal(t, 0, bp.minFill)
assert.Equal(t, true, bp.flushPending)
bp.mu.Unlock()
bp.flushAged()
assert.Equal(t, 0, bp.InUse())
assert.Equal(t, 2, bp.InPool())
assert.Equal(t, 2, bp.Alloced())
bp.mu.Lock()
assert.Equal(t, 2, bp.minFill)
assert.Equal(t, true, bp.flushPending)
bp.mu.Unlock()
bp.Put(bp.Get())
assert.Equal(t, 0, bp.InUse())
assert.Equal(t, 2, bp.InPool())
assert.Equal(t, 2, bp.Alloced())
bp.mu.Lock()
assert.Equal(t, 1, bp.minFill)
assert.Equal(t, true, bp.flushPending)
bp.mu.Unlock()
bp.flushAged()
assert.Equal(t, 0, bp.InUse())
assert.Equal(t, 1, bp.InPool())
assert.Equal(t, 1, bp.Alloced())
bp.mu.Lock()
assert.Equal(t, 1, bp.minFill)
assert.Equal(t, true, bp.flushPending)
bp.mu.Unlock()
bp.flushAged()
assert.Equal(t, 0, bp.InUse())
assert.Equal(t, 0, bp.InPool())
assert.Equal(t, 0, bp.Alloced())
bp.mu.Lock()
assert.Equal(t, 0, bp.minFill)
assert.Equal(t, false, bp.flushPending)
bp.mu.Unlock()
}
func TestPool(t *testing.T) {
for _, test := range []struct {
name string
useMmap bool
unreliable bool
}{
{
name: "make",
useMmap: false,
unreliable: false,
},
{
name: "mmap",
useMmap: true,
unreliable: false,
},
{
name: "canFail",
useMmap: false,
unreliable: true,
},
} {
t.Run(test.name, func(t *testing.T) {
t.Run("GetPut", func(t *testing.T) { testGetPut(t, test.useMmap, test.unreliable) })
t.Run("Flusher", func(t *testing.T) {
if test.name == "canFail" {
testy.SkipUnreliable(t) // fails regularly on macOS
}
testFlusher(t, test.useMmap, test.unreliable)
})
})
}
}
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