| 1 | package cdp |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "sync" |
| 6 | |
| 7 | "reasonix/internal/browser" |
| 8 | ) |
| 9 | |
| 10 | // Lazy is the executor a session is configured with but has not paid for yet. |
| 11 | // Attaching means launching or connecting to a browser, which no session |
| 12 | // should do just because the tools are registered, so the browser appears on |
| 13 | // the first tool call and not before. |
| 14 | type Lazy struct { |
| 15 | opts Options |
| 16 | |
| 17 | mu sync.Mutex |
| 18 | exec *Executor |
| 19 | err error |
| 20 | } |
| 21 | |
| 22 | var _ browser.Executor = (*Lazy)(nil) |
| 23 | |
| 24 | // NewLazy returns an executor that attaches on first use. |
| 25 | func NewLazy(opts Options) *Lazy { return &Lazy{opts: opts} } |
| 26 | |
| 27 | // ensure attaches once. A start failure is remembered and returned to every |
| 28 | // later call, so a missing browser costs one launch timeout and not one per |
| 29 | // tool call; a caller who cancelled their own context leaves no such verdict. |
| 30 | func (l *Lazy) ensure(ctx context.Context) (*Executor, error) { |
| 31 | l.mu.Lock() |
| 32 | defer l.mu.Unlock() |
| 33 | if l.exec != nil { |
| 34 | return l.exec, nil |
| 35 | } |
| 36 | if l.err != nil { |
| 37 | return nil, l.err |
| 38 | } |
| 39 | exec, err := New(ctx, l.opts) |
| 40 | if err != nil { |
| 41 | if ctx.Err() == nil { |
| 42 | l.err = err |
| 43 | } |
| 44 | return nil, err |
| 45 | } |
| 46 | l.exec = exec |
| 47 | return exec, nil |
| 48 | } |
| 49 | |
| 50 | // Available keeps an unattached executor visible: the capability exists, and |
| 51 | // the first call is what reports why a browser could not be reached. |
| 52 | func (l *Lazy) Available(ctx context.Context) bool { |
| 53 | l.mu.Lock() |
| 54 | exec, err := l.exec, l.err |
| 55 | l.mu.Unlock() |
| 56 | if exec != nil { |
| 57 | return exec.Available(ctx) |
| 58 | } |
| 59 | return err == nil |
| 60 | } |
| 61 | |
| 62 | // Shutdown releases the browser if one was ever attached. |
| 63 | func (l *Lazy) Shutdown() { |
| 64 | l.mu.Lock() |
| 65 | exec := l.exec |
| 66 | l.exec = nil |
| 67 | l.mu.Unlock() |
| 68 | if exec != nil { |
| 69 | exec.Shutdown() |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | func (l *Lazy) Tabs(ctx context.Context) ([]browser.Tab, error) { |
| 74 | exec, err := l.ensure(ctx) |
| 75 | if err != nil { |
| 76 | return nil, err |
| 77 | } |
| 78 | return exec.Tabs(ctx) |
| 79 | } |
| 80 | |
| 81 | func (l *Lazy) Open(ctx context.Context, req browser.OpenRequest) (browser.Tab, error) { |
| 82 | exec, err := l.ensure(ctx) |
| 83 | if err != nil { |
| 84 | return browser.Tab{}, err |
| 85 | } |
| 86 | return exec.Open(ctx, req) |
| 87 | } |
| 88 | |
| 89 | func (l *Lazy) Navigate(ctx context.Context, req browser.NavigateRequest) (browser.Tab, error) { |
| 90 | exec, err := l.ensure(ctx) |
| 91 | if err != nil { |
| 92 | return browser.Tab{}, err |
| 93 | } |
| 94 | return exec.Navigate(ctx, req) |
| 95 | } |
| 96 | |
| 97 | func (l *Lazy) Snapshot(ctx context.Context, req browser.SnapshotRequest) (browser.Snapshot, error) { |
| 98 | exec, err := l.ensure(ctx) |
| 99 | if err != nil { |
| 100 | return browser.Snapshot{}, err |
| 101 | } |
| 102 | return exec.Snapshot(ctx, req) |
| 103 | } |
| 104 | |
| 105 | func (l *Lazy) Screenshot(ctx context.Context, req browser.ScreenshotRequest) (browser.Screenshot, error) { |
| 106 | exec, err := l.ensure(ctx) |
| 107 | if err != nil { |
| 108 | return browser.Screenshot{}, err |
| 109 | } |
| 110 | return exec.Screenshot(ctx, req) |
| 111 | } |
| 112 | |
| 113 | func (l *Lazy) Act(ctx context.Context, req browser.ActRequest) (browser.ActResult, error) { |
| 114 | exec, err := l.ensure(ctx) |
| 115 | if err != nil { |
| 116 | return browser.ActResult{}, err |
| 117 | } |
| 118 | return exec.Act(ctx, req) |
| 119 | } |
| 120 | |
| 121 | func (l *Lazy) Downloads(ctx context.Context, req browser.DownloadsRequest) ([]browser.Download, error) { |
| 122 | exec, err := l.ensure(ctx) |
| 123 | if err != nil { |
| 124 | return nil, err |
| 125 | } |
| 126 | return exec.Downloads(ctx, req) |
| 127 | } |
| 128 | |
| 129 | func (l *Lazy) Close(ctx context.Context, req browser.CloseRequest) error { |
| 130 | exec, err := l.ensure(ctx) |
| 131 | if err != nil { |
| 132 | return err |
| 133 | } |
| 134 | return exec.Close(ctx, req) |
| 135 | } |
| 136 |