| 1 | package hostbox |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "errors" |
| 6 | "fmt" |
| 7 | "testing" |
| 8 | "time" |
| 9 | ) |
| 10 | |
| 11 | type renewableFake struct { |
| 12 | lost chan struct{} |
| 13 | released int |
| 14 | } |
| 15 | |
| 16 | func (h *renewableFake) Err() error { |
| 17 | select { |
| 18 | case <-h.lost: |
| 19 | return ErrChanged |
| 20 | default: |
| 21 | return nil |
| 22 | } |
| 23 | } |
| 24 | func (h *renewableFake) Lost() <-chan struct{} { return h.lost } |
| 25 | func (h *renewableFake) Release(context.Context) error { h.released++; return nil } |
| 26 | func TestRenewingLeaseCancelsRequestsAndReleasesOnce(t *testing.T) { |
| 27 | h := &renewableFake{lost: make(chan struct{})} |
| 28 | l := RenewingLeases{Region: "eu-west-1", Open: func(context.Context, string, string, string) (Renewable, error) { return h, nil }} |
| 29 | held, err := l.Acquire(t.Context(), "bucket", "instances/x.example/inc") |
| 30 | if err != nil { |
| 31 | t.Fatal(err) |
| 32 | } |
| 33 | ctx := held.(interface { |
| 34 | Context(context.Context) context.Context |
| 35 | }).Context(t.Context()) |
| 36 | close(h.lost) |
| 37 | select { |
| 38 | case <-ctx.Done(): |
| 39 | case <-time.After(time.Second): |
| 40 | t.Fatal("lease loss did not cancel request") |
| 41 | } |
| 42 | if !errors.Is(held.Check(ctx), context.Canceled) { |
| 43 | t.Fatal("lost handle accepted work") |
| 44 | } |
| 45 | held.Close() |
| 46 | held.Close() |
| 47 | if h.released != 1 { |
| 48 | t.Fatalf("released %d times", h.released) |
| 49 | } |
| 50 | } |
| 51 | func TestAggregateContextCancelsOnAnyConstituent(t *testing.T) { |
| 52 | a, b := &renewableFake{lost: make(chan struct{})}, &renewableFake{lost: make(chan struct{})} |
| 53 | leases := RenewingLeases{Region: "r", Open: func(_ context.Context, _, prefix, _ string) (Renewable, error) { |
| 54 | if prefix == "a" { |
| 55 | return a, nil |
| 56 | } |
| 57 | return b, nil |
| 58 | }} |
| 59 | held, err := (AggregateLeases{Leases: leases, Resolve: func(context.Context, string, string) ([]string, error) { return []string{"b", "a"}, nil }}).Acquire(t.Context(), "bucket", "a") |
| 60 | if err != nil { |
| 61 | t.Fatal(err) |
| 62 | } |
| 63 | defer held.Close() |
| 64 | ctx := held.(interface { |
| 65 | Context(context.Context) context.Context |
| 66 | }).Context(t.Context()) |
| 67 | close(b.lost) |
| 68 | select { |
| 69 | case <-ctx.Done(): |
| 70 | case <-time.After(time.Second): |
| 71 | t.Fatal("aggregate loss not propagated") |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | type releaseContextLease struct { |
| 76 | renewableFake |
| 77 | check func(context.Context) error |
| 78 | } |
| 79 | |
| 80 | func (h *releaseContextLease) Release(ctx context.Context) error { h.released++; return h.check(ctx) } |
| 81 | func TestRenewingReleaseSurvivesItsOwnCancellation(t *testing.T) { |
| 82 | for _, cancelled := range []bool{false, true} { |
| 83 | t.Run(fmt.Sprint(cancelled), func(t *testing.T) { |
| 84 | h := &releaseContextLease{renewableFake: renewableFake{lost: make(chan struct{})}} |
| 85 | l := RenewingLeases{Region: "eu-west-1", Open: func(context.Context, string, string, string) (Renewable, error) { return h, nil }} |
| 86 | held, err := l.Acquire(t.Context(), "bucket", "instances/x.example/inc") |
| 87 | if err != nil { |
| 88 | t.Fatal(err) |
| 89 | } |
| 90 | ctx, cancel := context.WithCancel(held.(interface { |
| 91 | Context(context.Context) context.Context |
| 92 | }).Context(t.Context())) |
| 93 | defer cancel() |
| 94 | if cancelled { |
| 95 | cancel() |
| 96 | } |
| 97 | h.check = func(cleanup context.Context) error { |
| 98 | if err := cleanup.Err(); err != nil { |
| 99 | return err |
| 100 | } |
| 101 | deadline, ok := cleanup.Deadline() |
| 102 | if !ok || time.Until(deadline) > RequestLimit || time.Until(deadline) <= 0 { |
| 103 | t.Fatal("release is not request bounded") |
| 104 | } |
| 105 | select { |
| 106 | case <-ctx.Done(): |
| 107 | case <-time.After(time.Second): |
| 108 | t.Fatal("work context still active during release") |
| 109 | } |
| 110 | return cleanup.Err() |
| 111 | } |
| 112 | if err := held.Release(ctx); err != nil { |
| 113 | t.Fatal("release cancelled itself", err) |
| 114 | } |
| 115 | held.Close() |
| 116 | if h.released != 1 { |
| 117 | t.Fatalf("released %d times", h.released) |
| 118 | } |
| 119 | if err := held.Check(t.Context()); err == nil { |
| 120 | t.Fatal("released lease still grants work") |
| 121 | } |
| 122 | }) |
| 123 | } |
| 124 | } |
| 125 | |
amadan