| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "reasonix/internal/provider" |
| 6 | "sync" |
| 7 | "testing" |
| 8 | ) |
| 9 | |
| 10 | func TestHistorySliceConcurrentReadsDuringSave(t *testing.T) { |
| 11 | app := historySliceTestApp(t) |
| 12 | dir := t.TempDir() |
| 13 | var msgs []provider.Message |
| 14 | for i := range 30 { |
| 15 | msgs = append(msgs, historySliceToolTurn(i)...) |
| 16 | } |
| 17 | sess, path := saveHistorySliceSession(t, dir, "race.jsonl", msgs) |
| 18 | newLiveHistoryTab(t, app, dir, path, sess) |
| 19 | |
| 20 | const readers = 4 |
| 21 | start := make(chan struct{}) |
| 22 | stop := make(chan struct{}) |
| 23 | var wg sync.WaitGroup |
| 24 | errs := make(chan error, readers) |
| 25 | for r := range readers { |
| 26 | wg.Add(1) |
| 27 | go func(r int) { |
| 28 | defer wg.Done() |
| 29 | <-start |
| 30 | cursor := "" |
| 31 | for { |
| 32 | select { |
| 33 | case <-stop: |
| 34 | return |
| 35 | default: |
| 36 | } |
| 37 | page := app.HistorySliceForTab("test", HistorySliceRequest{Turns: 3, Entries: 25, Cursor: cursor}) |
| 38 | if page.Entries == nil { |
| 39 | errs <- fmt.Errorf("reader %d: nil entries", r) |
| 40 | return |
| 41 | } |
| 42 | if page.Stale { |
| 43 | // A save landed between pages: restart from latest, as the |
| 44 | // frontend would. |
| 45 | cursor = "" |
| 46 | continue |
| 47 | } |
| 48 | if !page.HasOlder { |
| 49 | cursor = "" |
| 50 | continue |
| 51 | } |
| 52 | cursor = page.NextCursor |
| 53 | } |
| 54 | }(r) |
| 55 | } |
| 56 | |
| 57 | // Writer: append + save in a loop while readers page. |
| 58 | close(start) |
| 59 | for i := 30; i < 38; i++ { |
| 60 | sess.Add(historySliceUser(i, fmt.Sprintf("q%d", i))) |
| 61 | sess.Add(historySliceAssistant(i, fmt.Sprintf("a%d", i))) |
| 62 | if err := sess.Save(path); err != nil { |
| 63 | close(stop) |
| 64 | wg.Wait() |
| 65 | t.Fatalf("save: %v", err) |
| 66 | } |
| 67 | } |
| 68 | close(stop) |
| 69 | wg.Wait() |
| 70 | close(errs) |
| 71 | for err := range errs { |
| 72 | t.Fatal(err) |
| 73 | } |
| 74 | // The final state must page cleanly end to end. |
| 75 | pages := collectHistorySlicePages(t, app, "test", HistorySliceRequest{Turns: 5, Entries: 40}) |
| 76 | assertPagesMatchReference(t, pages, referenceHistoryRows(t, dir, path)) |
| 77 | } |
| 78 |