| 1 | package schedule |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "errors" |
| 6 | |
| 7 | "github.com/carlosframework/platform/internal/hostwrite" |
| 8 | "github.com/carlosframework/platform/internal/registry" |
| 9 | ) |
| 10 | |
| 11 | var errTimerHost = errors.New("schedule: selected timer host differs") |
| 12 | |
| 13 | type SelectedTimers struct { |
| 14 | Store TimerStore |
| 15 | Work hostwrite.Work |
| 16 | Context context.Context |
| 17 | Host string |
| 18 | } |
| 19 | |
| 20 | func (s SelectedTimers) write(host string, fn func() error) error { |
| 21 | if s.Store == nil || s.Work == nil || s.Context == nil { |
| 22 | return hostwrite.ErrUnavailable |
| 23 | } |
| 24 | if host != s.Host { |
| 25 | return errTimerHost |
| 26 | } |
| 27 | return s.Work.With(s.Context, hostwrite.Identity{}, fn) |
| 28 | } |
| 29 | func (s SelectedTimers) UpsertTimer(t registry.Timer) error { |
| 30 | t.Registration = "" |
| 31 | if handled, err := s.mutate(t, false); handled { |
| 32 | return err |
| 33 | } |
| 34 | return s.write(t.Host, func() error { return s.Store.UpsertTimer(t) }) |
| 35 | } |
| 36 | func (s SelectedTimers) DeleteTimer(host, name string) error { |
| 37 | if handled, err := s.mutate(registry.Timer{Host: host, Name: name}, true); handled { |
| 38 | return err |
| 39 | } |
| 40 | return s.write(host, func() error { return s.Store.DeleteTimer(host, name) }) |
| 41 | } |
| 42 | func (s SelectedTimers) GetTimer(host, name string) (*registry.Timer, error) { |
| 43 | if s.Store == nil { |
| 44 | return nil, hostwrite.ErrUnavailable |
| 45 | } |
| 46 | if host != s.Host { |
| 47 | return nil, errTimerHost |
| 48 | } |
| 49 | return s.Store.GetTimer(host, name) |
| 50 | } |
| 51 | func (s SelectedTimers) TimersFor(host string) ([]registry.Timer, error) { |
| 52 | if s.Store == nil { |
| 53 | return nil, hostwrite.ErrUnavailable |
| 54 | } |
| 55 | if host != s.Host { |
| 56 | return nil, errTimerHost |
| 57 | } |
| 58 | return s.Store.TimersFor(host) |
| 59 | } |
| 60 | func (s SelectedTimers) CountTimers(host, kind string) (int, error) { |
| 61 | if s.Store == nil { |
| 62 | return 0, hostwrite.ErrUnavailable |
| 63 | } |
| 64 | if host != s.Host { |
| 65 | return 0, errTimerHost |
| 66 | } |
| 67 | return s.Store.CountTimers(host, kind) |
| 68 | } |
| 69 | |
| 70 | var _ TimerStore = SelectedTimers{} |
| 71 | |
| 72 | // ReplaceTimers imports a landing snapshot without changing registrations. |
| 73 | // Its Work must have been selected as held-timers for the owning landing op. |
| 74 | func (s SelectedTimers) ReplaceTimers(host string, rows []registry.Timer) error { |
| 75 | replacement, ok := s.Store.(interface { |
| 76 | ReplaceTimers(string, []registry.Timer) error |
| 77 | }) |
| 78 | if !ok { |
| 79 | return hostwrite.ErrUnavailable |
| 80 | } |
| 81 | copyRows := append([]registry.Timer(nil), rows...) |
| 82 | for _, row := range copyRows { |
| 83 | if row.Host != host { |
| 84 | return errTimerHost |
| 85 | } |
| 86 | } |
| 87 | if _, ok := s.Work.(timerMutator); ok { |
| 88 | seen := map[string]bool{} |
| 89 | for _, row := range copyRows { |
| 90 | if row.Registration == "" || seen[row.Name] { |
| 91 | return registry.ErrClaimOwnership |
| 92 | } |
| 93 | seen[row.Name] = true |
| 94 | } |
| 95 | old, err := s.TimersFor(host) |
| 96 | if err != nil { |
| 97 | return err |
| 98 | } |
| 99 | keep := map[string]bool{} |
| 100 | for _, row := range copyRows { |
| 101 | keep[row.Name] = true |
| 102 | if _, err := s.mutate(row, false); err != nil { |
| 103 | return err |
| 104 | } |
| 105 | } |
| 106 | for _, row := range old { |
| 107 | if !keep[row.Name] { |
| 108 | if err := s.DeleteTimer(host, row.Name); err != nil { |
| 109 | return err |
| 110 | } |
| 111 | } |
| 112 | } |
| 113 | return nil |
| 114 | } |
| 115 | return s.write(host, func() error { return replacement.ReplaceTimers(host, copyRows) }) |
| 116 | } |
| 117 | |
amadan