mirror of
https://github.com/ClusterCockpit/cc-backend
synced 2026-03-01 05:47:29 +01:00
Review and improve buffer pool implmentation. Add unit tests.
This commit is contained in:
@@ -12,6 +12,526 @@ import (
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"github.com/ClusterCockpit/cc-lib/v2/schema"
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)
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// ─── Buffer pool ─────────────────────────────────────────────────────────────
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// TestBufferPoolGetReuse verifies that Get() returns pooled buffers before
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// allocating new ones, and that an empty pool allocates a fresh BufferCap buffer.
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func TestBufferPoolGetReuse(t *testing.T) {
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pool := NewPersistentBufferPool()
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original := &buffer{data: make([]schema.Float, 0, BufferCap), lastUsed: time.Now().Unix()}
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pool.Put(original)
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reused := pool.Get()
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if reused != original {
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t.Error("Get() should return the previously pooled buffer")
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}
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if pool.GetSize() != 0 {
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t.Errorf("pool size after Get() = %d, want 0", pool.GetSize())
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}
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// Empty pool must allocate a fresh buffer with the standard capacity.
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fresh := pool.Get()
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if fresh == nil {
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t.Fatal("Get() from empty pool returned nil")
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}
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if cap(fresh.data) != BufferCap {
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t.Errorf("fresh buffer cap = %d, want %d", cap(fresh.data), BufferCap)
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}
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}
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// TestBufferPoolClear verifies that Clear() drains all entries.
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func TestBufferPoolClear(t *testing.T) {
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pool := NewPersistentBufferPool()
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for i := 0; i < 10; i++ {
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pool.Put(&buffer{data: make([]schema.Float, 0), lastUsed: time.Now().Unix()})
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}
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pool.Clear()
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if pool.GetSize() != 0 {
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t.Errorf("pool size after Clear() = %d, want 0", pool.GetSize())
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}
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}
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// TestBufferPoolMaxSize verifies that Put() silently drops buffers once the
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// pool reaches maxPoolSize, preventing unbounded memory growth.
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func TestBufferPoolMaxSize(t *testing.T) {
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pool := NewPersistentBufferPool()
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for i := 0; i < maxPoolSize; i++ {
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pool.Put(&buffer{data: make([]schema.Float, 0, BufferCap), lastUsed: time.Now().Unix()})
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}
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if pool.GetSize() != maxPoolSize {
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t.Fatalf("pool size = %d, want %d", pool.GetSize(), maxPoolSize)
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}
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pool.Put(&buffer{data: make([]schema.Float, 0, BufferCap), lastUsed: time.Now().Unix()})
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if pool.GetSize() != maxPoolSize {
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t.Errorf("pool size after overflow Put = %d, want %d (should not grow)", pool.GetSize(), maxPoolSize)
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}
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}
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// ─── Buffer helpers ───────────────────────────────────────────────────────────
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// TestBufferEndFirstWrite verifies the end() and firstWrite() calculations.
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func TestBufferEndFirstWrite(t *testing.T) {
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// start=90, freq=10 → firstWrite = 90+5 = 95
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b := &buffer{data: make([]schema.Float, 4, BufferCap), frequency: 10, start: 90}
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if fw := b.firstWrite(); fw != 95 {
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t.Errorf("firstWrite() = %d, want 95", fw)
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}
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// end = firstWrite + len(data)*freq = 95 + 4*10 = 135
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if e := b.end(); e != 135 {
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t.Errorf("end() = %d, want 135", e)
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}
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}
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// ─── Buffer write ─────────────────────────────────────────────────────────────
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// TestBufferWriteNaNFill verifies that skipped timestamps are filled with NaN.
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func TestBufferWriteNaNFill(t *testing.T) {
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b := newBuffer(100, 10)
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b.write(100, schema.Float(1.0))
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// skip 110 and 120
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b.write(130, schema.Float(4.0))
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if len(b.data) != 4 {
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t.Fatalf("len(data) = %d, want 4 (1 value + 2 NaN + 1 value)", len(b.data))
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}
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if b.data[0] != schema.Float(1.0) {
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t.Errorf("data[0] = %v, want 1.0", b.data[0])
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}
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if !b.data[1].IsNaN() {
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t.Errorf("data[1] should be NaN (gap), got %v", b.data[1])
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}
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if !b.data[2].IsNaN() {
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t.Errorf("data[2] should be NaN (gap), got %v", b.data[2])
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}
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if b.data[3] != schema.Float(4.0) {
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t.Errorf("data[3] = %v, want 4.0", b.data[3])
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}
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}
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// TestBufferWriteCapacityOverflow verifies that exceeding capacity creates and
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// links a new buffer rather than panicking or silently dropping data.
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func TestBufferWriteCapacityOverflow(t *testing.T) {
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// Cap=2 so the third write must overflow into a new buffer.
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b := &buffer{data: make([]schema.Float, 0, 2), frequency: 10, start: 95}
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nb, _ := b.write(100, schema.Float(1.0))
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nb, _ = nb.write(110, schema.Float(2.0))
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nb, err := nb.write(120, schema.Float(3.0))
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if err != nil {
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t.Fatalf("write() error = %v", err)
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}
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if nb == b {
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t.Fatal("write() should have returned a new buffer after overflow")
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}
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if nb.prev != b {
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t.Error("new buffer should link back to old via prev")
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}
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if b.next != nb {
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t.Error("old buffer should link forward to new via next")
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}
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if len(b.data) != 2 {
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t.Errorf("old buffer len = %d, want 2 (full)", len(b.data))
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}
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if nb.data[0] != schema.Float(3.0) {
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t.Errorf("new buffer data[0] = %v, want 3.0", nb.data[0])
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}
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}
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// TestBufferWriteOverwrite verifies that writing to an already-occupied index
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// replaces the value rather than appending.
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func TestBufferWriteOverwrite(t *testing.T) {
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b := newBuffer(100, 10)
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b.write(100, schema.Float(1.0))
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b.write(110, schema.Float(2.0))
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// Overwrite the first slot.
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b.write(100, schema.Float(99.0))
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if len(b.data) != 2 {
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t.Errorf("len(data) after overwrite = %d, want 2 (no append)", len(b.data))
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}
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if b.data[0] != schema.Float(99.0) {
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t.Errorf("data[0] after overwrite = %v, want 99.0", b.data[0])
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}
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}
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// ─── Buffer read ──────────────────────────────────────────────────────────────
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// TestBufferReadBeforeFirstWrite verifies that 'from' is clamped to firstWrite
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// when the requested range starts before any data in the chain.
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func TestBufferReadBeforeFirstWrite(t *testing.T) {
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b := newBuffer(100, 10) // firstWrite = 100
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b.write(100, schema.Float(1.0))
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b.write(110, schema.Float(2.0))
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data := make([]schema.Float, 10)
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result, adjustedFrom, _, err := b.read(50, 120, data)
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if err != nil {
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t.Fatalf("read() error = %v", err)
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}
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if adjustedFrom != 100 {
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t.Errorf("adjustedFrom = %d, want 100 (clamped to firstWrite)", adjustedFrom)
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}
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if len(result) != 2 {
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t.Errorf("len(result) = %d, want 2", len(result))
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}
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}
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// TestBufferReadChain verifies that read() traverses a multi-buffer chain and
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// returns contiguous values from both buffers.
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//
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// The switch to b.next in read() triggers on idx >= cap(b.data), so b1 must
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// be full (len == cap) for the loop to advance to b2 without producing NaN.
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func TestBufferReadChain(t *testing.T) {
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// b1: cap=3, covers t=100..120. b2: covers t=130..150. b2 is head.
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b1 := &buffer{data: make([]schema.Float, 0, 3), frequency: 10, start: 95}
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b1.data = append(b1.data, 1.0, 2.0, 3.0) // fills b1: len=cap=3
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b2 := &buffer{data: make([]schema.Float, 0, 3), frequency: 10, start: 125}
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b2.data = append(b2.data, 4.0, 5.0, 6.0) // t=130,140,150
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b2.prev = b1
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b1.next = b2
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data := make([]schema.Float, 6)
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result, from, to, err := b2.read(100, 160, data)
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if err != nil {
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t.Fatalf("read() error = %v", err)
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}
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if from != 100 || to != 160 {
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t.Errorf("read() from/to = %d/%d, want 100/160", from, to)
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}
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if len(result) != 6 {
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t.Fatalf("len(result) = %d, want 6", len(result))
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}
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for i, want := range []schema.Float{1, 2, 3, 4, 5, 6} {
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if result[i] != want {
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t.Errorf("result[%d] = %v, want %v", i, result[i], want)
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}
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}
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}
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// TestBufferReadIdxAfterSwitch is a regression test for the index recalculation
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// bug after switching to b.next during a read.
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//
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// When both buffers share the same start time (can happen with checkpoint-loaded
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// chains), the old code hardcoded idx=0 after the switch, causing reads at time t
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// to return the wrong element from the next buffer.
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func TestBufferReadIdxAfterSwitch(t *testing.T) {
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// b1: cap=2, both buffers start at 0 (firstWrite=5).
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// b1 carries t=5 and t=15; b2 carries t=5,15,25,35 with the same start.
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// When reading reaches t=25 the loop overflows b1 (idx=2 >= cap=2) and
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// switches to b2. The correct index in b2 is (25-0)/10=2 → b2.data[2]=30.0.
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// The old code set idx=0 → b2.data[0]=10.0 (wrong).
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b1 := &buffer{data: make([]schema.Float, 0, 2), frequency: 10, start: 0}
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b1.data = append(b1.data, schema.Float(1.0), schema.Float(2.0)) // t=5, t=15
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b2 := &buffer{data: make([]schema.Float, 0, 10), frequency: 10, start: 0}
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b2.data = append(b2.data,
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schema.Float(10.0), schema.Float(20.0),
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schema.Float(30.0), schema.Float(40.0)) // t=5,15,25,35
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b2.prev = b1
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b1.next = b2
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// from=0 triggers the walkback to b1 (from < b2.firstWrite=5).
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// After clamping, the loop runs t=5,15,25,35.
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data := make([]schema.Float, 4)
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result, _, _, err := b2.read(0, 36, data)
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if err != nil {
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t.Fatalf("read() error = %v", err)
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}
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if len(result) < 3 {
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t.Fatalf("len(result) = %d, want >= 3", len(result))
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}
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if result[0] != schema.Float(1.0) {
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t.Errorf("result[0] (t=5) = %v, want 1.0 (from b1)", result[0])
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}
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if result[1] != schema.Float(2.0) {
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t.Errorf("result[1] (t=15) = %v, want 2.0 (from b1)", result[1])
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}
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// This is the critical assertion: old code returned 10.0 (b2.data[0]).
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if result[2] != schema.Float(30.0) {
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t.Errorf("result[2] (t=25) = %v, want 30.0 (idx recalculation fix)", result[2])
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}
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}
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// TestBufferReadNaNValues verifies that NaN slots written to the buffer are
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// returned as NaN during read.
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func TestBufferReadNaNValues(t *testing.T) {
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b := newBuffer(100, 10)
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b.write(100, schema.Float(1.0))
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b.write(110, schema.NaN)
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b.write(120, schema.Float(3.0))
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data := make([]schema.Float, 3)
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result, _, _, err := b.read(100, 130, data)
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if err != nil {
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t.Fatalf("read() error = %v", err)
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}
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if len(result) != 3 {
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t.Fatalf("len(result) = %d, want 3", len(result))
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}
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if result[0] != schema.Float(1.0) {
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t.Errorf("result[0] = %v, want 1.0", result[0])
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}
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if !result[1].IsNaN() {
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t.Errorf("result[1] should be NaN, got %v", result[1])
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}
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if result[2] != schema.Float(3.0) {
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t.Errorf("result[2] = %v, want 3.0", result[2])
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}
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}
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// TestBufferReadAccumulation verifies the += accumulation pattern used for
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// aggregation: values are added to whatever was already in the data slice.
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func TestBufferReadAccumulation(t *testing.T) {
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b := newBuffer(100, 10)
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b.write(100, schema.Float(3.0))
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b.write(110, schema.Float(5.0))
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// Pre-populate data slice (simulates a second metric being summed in).
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data := []schema.Float{2.0, 1.0, 0.0}
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result, _, _, err := b.read(100, 120, data)
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if err != nil {
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t.Fatalf("read() error = %v", err)
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}
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// 2.0+3.0=5.0, 1.0+5.0=6.0
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if result[0] != schema.Float(5.0) {
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t.Errorf("result[0] = %v, want 5.0 (2+3)", result[0])
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}
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if result[1] != schema.Float(6.0) {
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t.Errorf("result[1] = %v, want 6.0 (1+5)", result[1])
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}
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}
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// ─── Buffer free ─────────────────────────────────────────────────────────────
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// newTestPool swaps out the package-level bufferPool for a fresh isolated one
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// and returns a cleanup function that restores the original.
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func newTestPool(t *testing.T) *PersistentBufferPool {
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t.Helper()
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pool := NewPersistentBufferPool()
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saved := bufferPool
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bufferPool = pool
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t.Cleanup(func() { bufferPool = saved })
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return pool
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}
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// TestBufferFreeRetention verifies that free() removes buffers whose entire
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// time range falls before the retention threshold and returns them to the pool.
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func TestBufferFreeRetention(t *testing.T) {
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pool := newTestPool(t)
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// b1: firstWrite=5, end=25 b2: firstWrite=25, end=45 b3: firstWrite=45, end=65
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b1 := &buffer{data: make([]schema.Float, 0, BufferCap), frequency: 10, start: 0}
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b1.data = append(b1.data, 1.0, 2.0)
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b2 := &buffer{data: make([]schema.Float, 0, BufferCap), frequency: 10, start: 20}
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b2.data = append(b2.data, 3.0, 4.0)
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b2.prev = b1
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b1.next = b2
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b3 := &buffer{data: make([]schema.Float, 0, BufferCap), frequency: 10, start: 40}
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b3.data = append(b3.data, 5.0, 6.0)
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b3.prev = b2
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b2.next = b3
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// Threshold=30: b1.end()=25 < 30 → freed; b2.end()=45 >= 30 → kept.
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delme, n := b3.free(30)
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if delme {
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t.Error("head buffer b3 should not be marked for deletion")
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}
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if n != 1 {
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t.Errorf("freed count = %d, want 1", n)
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}
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if b2.prev != nil {
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t.Error("b1 should have been unlinked from b2.prev")
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}
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if b3.prev != b2 {
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t.Error("b3 should still reference b2")
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}
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if pool.GetSize() != 1 {
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t.Errorf("pool size = %d, want 1 (b1 returned)", pool.GetSize())
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}
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}
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// TestBufferFreeAll verifies that free() removes all buffers and signals the
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// caller to delete the head when the entire chain is older than the threshold.
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func TestBufferFreeAll(t *testing.T) {
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pool := newTestPool(t)
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b1 := &buffer{data: make([]schema.Float, 0, BufferCap), frequency: 10, start: 0}
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b1.data = append(b1.data, 1.0, 2.0) // end=25
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b2 := &buffer{data: make([]schema.Float, 0, BufferCap), frequency: 10, start: 20}
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b2.data = append(b2.data, 3.0, 4.0) // end=45
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b2.prev = b1
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b1.next = b2
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// Threshold=100 > both ends → both should be freed.
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delme, n := b2.free(100)
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if !delme {
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t.Error("head buffer b2 should be marked for deletion when all data is stale")
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}
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if n != 2 {
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t.Errorf("freed count = %d, want 2", n)
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}
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// b1 was freed inside free(); b2 is returned with delme=true for the caller.
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if pool.GetSize() != 1 {
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t.Errorf("pool size = %d, want 1 (b1 returned; b2 returned by caller)", pool.GetSize())
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}
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}
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// ─── forceFreeOldest ─────────────────────────────────────────────────────────
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// TestForceFreeOldestPoolReturn verifies that forceFreeOldest() returns the
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// freed buffer to the pool (regression: previously it was just dropped).
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func TestForceFreeOldestPoolReturn(t *testing.T) {
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pool := newTestPool(t)
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b1 := &buffer{data: make([]schema.Float, 0, BufferCap), frequency: 10, start: 0}
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b2 := &buffer{data: make([]schema.Float, 0, BufferCap), frequency: 10, start: 20}
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b3 := &buffer{data: make([]schema.Float, 0, BufferCap), frequency: 10, start: 40}
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b1.data = append(b1.data, 1.0)
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b2.data = append(b2.data, 2.0)
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b3.data = append(b3.data, 3.0)
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b2.prev = b1
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b1.next = b2
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b3.prev = b2
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b2.next = b3
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delme, n := b3.forceFreeOldest()
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if delme {
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t.Error("head b3 should not be marked for deletion (chain has 3 buffers)")
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}
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if n != 1 {
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t.Errorf("freed count = %d, want 1", n)
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}
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if b2.prev != nil {
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t.Error("b1 should have been unlinked from b2.prev after forceFreeOldest")
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}
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if b3.prev != b2 {
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t.Error("b3 should still link to b2")
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}
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if pool.GetSize() != 1 {
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t.Errorf("pool size = %d, want 1 (b1 returned to pool)", pool.GetSize())
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}
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}
|
||||
|
||||
// TestForceFreeOldestSingleBuffer verifies that forceFreeOldest() returns
|
||||
// delme=true when the buffer is the only one in the chain.
|
||||
func TestForceFreeOldestSingleBuffer(t *testing.T) {
|
||||
b := newBuffer(100, 10)
|
||||
b.write(100, schema.Float(1.0))
|
||||
|
||||
delme, n := b.forceFreeOldest()
|
||||
if !delme {
|
||||
t.Error("single-buffer chain: expected delme=true (the buffer IS the oldest)")
|
||||
}
|
||||
if n != 1 {
|
||||
t.Errorf("freed count = %d, want 1", n)
|
||||
}
|
||||
}
|
||||
|
||||
// ─── iterFromTo ───────────────────────────────────────────────────────────────
|
||||
|
||||
// TestBufferIterFromToOrder verifies that iterFromTo invokes the callback in
|
||||
// chronological order (oldest → newest).
|
||||
func TestBufferIterFromToOrder(t *testing.T) {
|
||||
// Each buffer has 2 data points so end() = firstWrite + 2*freq.
|
||||
b1 := &buffer{data: make([]schema.Float, 2, BufferCap), frequency: 10, start: 0} // end=25
|
||||
b2 := &buffer{data: make([]schema.Float, 2, BufferCap), frequency: 10, start: 20} // end=45
|
||||
b3 := &buffer{data: make([]schema.Float, 2, BufferCap), frequency: 10, start: 40} // end=65
|
||||
b2.prev = b1
|
||||
b1.next = b2
|
||||
b3.prev = b2
|
||||
b2.next = b3
|
||||
|
||||
var order []*buffer
|
||||
err := b3.iterFromTo(0, 100, func(b *buffer) error {
|
||||
order = append(order, b)
|
||||
return nil
|
||||
})
|
||||
if err != nil {
|
||||
t.Fatalf("iterFromTo() error = %v", err)
|
||||
}
|
||||
if len(order) != 3 {
|
||||
t.Fatalf("callback count = %d, want 3", len(order))
|
||||
}
|
||||
if order[0] != b1 || order[1] != b2 || order[2] != b3 {
|
||||
t.Error("iterFromTo() did not call callbacks in chronological (oldest→newest) order")
|
||||
}
|
||||
}
|
||||
|
||||
// TestBufferIterFromToFiltered verifies that iterFromTo only calls the callback
|
||||
// for buffers whose time range overlaps [from, to].
|
||||
func TestBufferIterFromToFiltered(t *testing.T) {
|
||||
// b1: end=25 b2: start=20, end=45 b3: start=40, end=65
|
||||
b1 := &buffer{data: make([]schema.Float, 2, BufferCap), frequency: 10, start: 0}
|
||||
b2 := &buffer{data: make([]schema.Float, 2, BufferCap), frequency: 10, start: 20}
|
||||
b3 := &buffer{data: make([]schema.Float, 2, BufferCap), frequency: 10, start: 40}
|
||||
b2.prev = b1
|
||||
b1.next = b2
|
||||
b3.prev = b2
|
||||
b2.next = b3
|
||||
|
||||
// [30,50]: b1.end=25 < 30 → excluded; b2 and b3 overlap → included.
|
||||
var visited []*buffer
|
||||
b3.iterFromTo(30, 50, func(b *buffer) error {
|
||||
visited = append(visited, b)
|
||||
return nil
|
||||
})
|
||||
if len(visited) != 2 {
|
||||
t.Fatalf("visited count = %d, want 2 (b2 and b3)", len(visited))
|
||||
}
|
||||
if visited[0] != b2 || visited[1] != b3 {
|
||||
t.Errorf("visited = %v, want [b2, b3]", visited)
|
||||
}
|
||||
}
|
||||
|
||||
// TestBufferIterFromToNilBuffer verifies that iterFromTo on a nil buffer is a
|
||||
// safe no-op.
|
||||
func TestBufferIterFromToNilBuffer(t *testing.T) {
|
||||
var b *buffer
|
||||
called := false
|
||||
err := b.iterFromTo(0, 100, func(_ *buffer) error {
|
||||
called = true
|
||||
return nil
|
||||
})
|
||||
if err != nil {
|
||||
t.Errorf("iterFromTo(nil) error = %v, want nil", err)
|
||||
}
|
||||
if called {
|
||||
t.Error("callback should not be called for a nil buffer")
|
||||
}
|
||||
}
|
||||
|
||||
// ─── count ────────────────────────────────────────────────────────────────────
|
||||
|
||||
// TestBufferCount verifies that count() sums data-point lengths across the
|
||||
// entire chain, including all prev links.
|
||||
func TestBufferCount(t *testing.T) {
|
||||
b1 := &buffer{data: make([]schema.Float, 3, BufferCap), frequency: 10, start: 0}
|
||||
b2 := &buffer{data: make([]schema.Float, 2, BufferCap), frequency: 10, start: 35}
|
||||
b3 := &buffer{data: make([]schema.Float, 5, BufferCap), frequency: 10, start: 60}
|
||||
b2.prev = b1
|
||||
b1.next = b2
|
||||
b3.prev = b2
|
||||
b2.next = b3
|
||||
|
||||
if got := b3.count(); got != 10 {
|
||||
t.Errorf("count() = %d, want 10 (3+2+5)", got)
|
||||
}
|
||||
|
||||
// Single buffer.
|
||||
lone := &buffer{data: make([]schema.Float, 7, BufferCap)}
|
||||
if got := lone.count(); got != 7 {
|
||||
t.Errorf("count() single buffer = %d, want 7", got)
|
||||
}
|
||||
}
|
||||
|
||||
// ─── Existing tests below ────────────────────────────────────────────────────
|
||||
|
||||
func TestAssignAggregationStrategy(t *testing.T) {
|
||||
tests := []struct {
|
||||
name string
|
||||
|
||||
Reference in New Issue
Block a user