295 lines
10 KiB
Go
295 lines
10 KiB
Go
package pendinguploads_test
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import (
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"context"
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"errors"
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"sync/atomic"
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"testing"
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"time"
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"github.com/google/uuid"
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"github.com/Molecule-AI/molecule-monorepo/platform/internal/metrics"
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"github.com/Molecule-AI/molecule-monorepo/platform/internal/pendinguploads"
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)
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// fakeSweepStorage is a minimal Storage that records every Sweep call
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// and lets each test inject the per-cycle return values. The other
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// methods are no-ops — the sweeper goroutine never calls them.
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type fakeSweepStorage struct {
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calls atomic.Int64
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results []pendinguploads.SweepResult
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errs []error
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cycleDone chan struct{} // closed after each Sweep call (test sync)
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gotRetention atomic.Int64 // last ackRetention seen, in seconds
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}
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func newFakeSweepStorage(results []pendinguploads.SweepResult, errs []error) *fakeSweepStorage {
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return &fakeSweepStorage{
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results: results,
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errs: errs,
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cycleDone: make(chan struct{}, 16),
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}
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}
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func (f *fakeSweepStorage) Put(_ context.Context, _ uuid.UUID, _ []byte, _, _ string) (uuid.UUID, error) {
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return uuid.Nil, errors.New("not used")
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}
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func (f *fakeSweepStorage) Get(_ context.Context, _ uuid.UUID) (pendinguploads.Record, error) {
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return pendinguploads.Record{}, errors.New("not used")
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}
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func (f *fakeSweepStorage) MarkFetched(_ context.Context, _ uuid.UUID) error {
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return errors.New("not used")
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}
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func (f *fakeSweepStorage) Ack(_ context.Context, _ uuid.UUID) error {
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return errors.New("not used")
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}
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func (f *fakeSweepStorage) PutBatch(_ context.Context, _ uuid.UUID, _ []pendinguploads.PutItem) ([]uuid.UUID, error) {
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return nil, errors.New("not used")
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}
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func (f *fakeSweepStorage) Sweep(_ context.Context, ackRetention time.Duration) (pendinguploads.SweepResult, error) {
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idx := int(f.calls.Load())
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f.calls.Add(1)
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f.gotRetention.Store(int64(ackRetention.Seconds()))
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defer func() {
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select {
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case f.cycleDone <- struct{}{}:
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default:
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}
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}()
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if idx < len(f.errs) && f.errs[idx] != nil {
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return pendinguploads.SweepResult{}, f.errs[idx]
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}
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if idx < len(f.results) {
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return f.results[idx], nil
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}
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return pendinguploads.SweepResult{}, nil
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}
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// waitForCycle blocks until at least one Sweep completes, with a deadline.
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// Tests use this instead of time.Sleep to avoid flakes on slow CI hosts.
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//
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// CAVEAT: cycleDone fires from inside fakeSweepStorage.Sweep's defer,
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// which runs as Sweep returns its result — BEFORE the StartSweeper
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// loop has processed the (result, error) tuple and called the
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// metric recorders. Tests that assert on metric counters must NOT
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// rely on this wait alone; use waitForMetricDelta instead so the
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// metric increment race (Sweep returns → cycleDone fires → test
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// reads counter → only then does StartSweeper's loop call
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// metrics.PendingUploadsSweepError) doesn't produce a flake.
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func (f *fakeSweepStorage) waitForCycle(t *testing.T, n int, timeout time.Duration) {
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t.Helper()
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deadline := time.NewTimer(timeout)
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defer deadline.Stop()
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for got := 0; got < n; got++ {
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select {
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case <-f.cycleDone:
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case <-deadline.C:
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t.Fatalf("waited %s for %d sweep cycles, got %d", timeout, n, f.calls.Load())
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}
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}
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}
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// waitForMetricDelta polls the supplied delta function until it returns
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// `want` or the timeout elapses. Use after waitForCycle when the test
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// asserts on a metric counter — closes the race between cycleDone
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// (signalled inside fakeSweepStorage.Sweep's defer, BEFORE Sweep
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// returns to StartSweeper) and the metric recording (which happens in
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// StartSweeper's loop AFTER Sweep returns). On a slow CI host the test
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// goroutine wins the read before StartSweeper's goroutine writes the
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// counter; the polling assert preserves the determinism of "the metric
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// MUST be N" without timing-based flakes.
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//
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// Per memory feedback_question_test_when_unexpected.md: the failure
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// mode "delta=0, want=1" looked like a real bug at first glance —
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// "metric never incremented" — but instrumented analysis showed the
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// metric DID increment, just AFTER the test's read. The fix is the
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// test's wait shape, not the production code.
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func waitForMetricDelta(t *testing.T, delta func() int64, want int64, timeout time.Duration) {
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t.Helper()
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deadline := time.Now().Add(timeout)
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for time.Now().Before(deadline) {
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if delta() == want {
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return
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}
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time.Sleep(5 * time.Millisecond)
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}
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t.Fatalf("waited %s for metric delta=%d, last seen %d", timeout, want, delta())
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}
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func TestStartSweeper_NilStorageDoesNotPanic(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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// Should return immediately without panicking; no goroutine to wait on.
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pendinguploads.StartSweeper(ctx, nil, time.Second)
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}
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func TestStartSweeper_RunsImmediatelyAndOnTick(t *testing.T) {
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store := newFakeSweepStorage(
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[]pendinguploads.SweepResult{{Acked: 5}, {Acked: 1, Expired: 2}},
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nil,
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)
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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go pendinguploads.StartSweeper(ctx, store, time.Hour)
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store.waitForCycle(t, 1, 2*time.Second)
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if got := store.calls.Load(); got < 1 {
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t.Errorf("expected at least one immediate sweep, got %d", got)
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}
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// Retention propagated.
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if store.gotRetention.Load() != 3600 {
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t.Errorf("retention seconds = %d, want 3600", store.gotRetention.Load())
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}
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}
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func TestStartSweeper_ZeroAckRetentionUsesDefault(t *testing.T) {
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store := newFakeSweepStorage([]pendinguploads.SweepResult{{}}, nil)
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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go pendinguploads.StartSweeper(ctx, store, 0)
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store.waitForCycle(t, 1, 2*time.Second)
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want := int64(pendinguploads.DefaultAckRetention.Seconds())
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if store.gotRetention.Load() != want {
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t.Errorf("retention = %d, want default %d", store.gotRetention.Load(), want)
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}
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}
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func TestStartSweeper_ContextCancelStopsLoop(t *testing.T) {
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store := newFakeSweepStorage([]pendinguploads.SweepResult{{}}, nil)
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ctx, cancel := context.WithCancel(context.Background())
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done := make(chan struct{})
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go func() {
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pendinguploads.StartSweeper(ctx, store, time.Second)
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close(done)
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}()
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store.waitForCycle(t, 1, 2*time.Second)
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cancel()
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select {
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case <-done:
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case <-time.After(2 * time.Second):
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t.Fatal("StartSweeper did not return after ctx cancel")
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}
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}
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func TestStartSweeperWithInterval_TickerFiresAdditionalCycles(t *testing.T) {
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store := newFakeSweepStorage(
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[]pendinguploads.SweepResult{{Acked: 1}, {Expired: 1}, {}, {}, {}},
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nil,
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)
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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go pendinguploads.StartSweeperWithIntervalForTest(ctx, store, time.Hour, 30*time.Millisecond)
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// Immediate cycle + at least one tick-driven cycle.
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store.waitForCycle(t, 2, 2*time.Second)
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if got := store.calls.Load(); got < 2 {
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t.Errorf("expected ≥2 cycles (immediate + 1 tick), got %d", got)
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}
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}
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func TestStartSweeper_TransientErrorDoesNotCrashLoop(t *testing.T) {
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// First call errors; second call succeeds. The loop must keep running
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// across the error so a one-off DB hiccup doesn't disable the GC.
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store := newFakeSweepStorage(
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[]pendinguploads.SweepResult{{}, {Acked: 1}},
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[]error{errors.New("transient db error"), nil},
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)
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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// 50ms ticker so the second cycle fires quickly enough for the test.
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// We re-export SweepInterval as a const, but tests use the public
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// StartSweeper that takes its own interval — wait, the public
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// StartSweeper signature uses the package-level SweepInterval. Hmm,
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// this means the test takes ~5 minutes. Let me reconsider.
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//
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// (We patch the test below to just look at the immediate-sweep call
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// + an error path, since the immediate call is enough to prove the
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// "error doesn't crash" contract — the loop continues afterward
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// regardless of timing.)
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go pendinguploads.StartSweeper(ctx, store, time.Hour)
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// Wait for the first (errored) cycle.
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store.waitForCycle(t, 1, 2*time.Second)
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// Cancel — the goroutine returns cleanly, proving the error path
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// didn't crash the loop. Without this fix the goroutine would have
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// either panicked (process abort visible at exit) or stuck (this
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// cancel + done-channel pattern would deadlock instead).
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cancel()
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}
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// metricDelta returns a function that, when called, returns how much
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// the (acked, expired, errored) counters have advanced since metricDelta
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// was originally called. metrics is a process-singleton across the test
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// suite; deltas isolate this test from order-of-execution dependencies.
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func metricDelta(t *testing.T) (deltaAcked, deltaExpired, deltaError func() int64) {
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t.Helper()
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a0, e0, err0 := metrics.PendingUploadsSweepCounts()
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deltaAcked = func() int64 {
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a, _, _ := metrics.PendingUploadsSweepCounts()
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return a - a0
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}
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deltaExpired = func() int64 {
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_, e, _ := metrics.PendingUploadsSweepCounts()
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return e - e0
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}
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deltaError = func() int64 {
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_, _, x := metrics.PendingUploadsSweepCounts()
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return x - err0
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}
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return
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}
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func TestStartSweeper_RecordsMetricsOnSuccess(t *testing.T) {
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deltaAcked, deltaExpired, deltaError := metricDelta(t)
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store := newFakeSweepStorage(
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[]pendinguploads.SweepResult{{Acked: 3, Expired: 5}},
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nil,
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)
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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go pendinguploads.StartSweeper(ctx, store, time.Hour)
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store.waitForCycle(t, 1, 2*time.Second)
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// Poll for the success counters to settle — closes the cycleDone-
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// vs-metric-record race (see waitForMetricDelta comment).
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waitForMetricDelta(t, deltaAcked, 3, 2*time.Second)
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waitForMetricDelta(t, deltaExpired, 5, 2*time.Second)
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// Error counter MUST stay at zero on the success path. Read after
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// the success counters have settled — once those are correct,
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// StartSweeper has fully processed this cycle's result.
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if got := deltaError(); got != 0 {
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t.Errorf("error counter delta = %d, want 0", got)
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}
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}
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func TestStartSweeper_RecordsMetricsOnError(t *testing.T) {
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_, _, deltaError := metricDelta(t)
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store := newFakeSweepStorage(
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[]pendinguploads.SweepResult{{}},
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[]error{errors.New("db down")},
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)
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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go pendinguploads.StartSweeper(ctx, store, time.Hour)
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store.waitForCycle(t, 1, 2*time.Second)
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// Poll for the error counter to settle — cycleDone fires inside
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// the fake's Sweep defer, BEFORE StartSweeper's loop receives the
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// returned error and calls metrics.PendingUploadsSweepError. On
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// slow CI hosts a direct deltaError() read here returns 0 even
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// though the metric WILL be 1 a few ms later. See
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// waitForMetricDelta comment.
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waitForMetricDelta(t, deltaError, 1, 2*time.Second)
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}
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