92 lines
2.6 KiB
Go
92 lines
2.6 KiB
Go
// Copyright (c) 2026 Storm Dragon
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// SPDX-License-Identifier: GPL-3.0-or-later
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package wine
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import (
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"context"
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"errors"
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"git.stormux.org/storm/cthulhu/internal/atspi"
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"github.com/godbus/dbus/v5"
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"time"
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)
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func (r *ReviewRegistry) Capture(parent context.Context, id atspi.ObjectID) (*atspi.AccessibleTree, error) {
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if !IsReviewID(id) {
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return nil, ErrReviewUnavailable
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}
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ctx, cancel := context.WithTimeout(parent, 500*time.Millisecond)
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defer cancel()
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select {
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case r.captureGate <- struct{}{}:
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defer func() { <-r.captureGate }()
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case <-ctx.Done():
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return nil, ctx.Err()
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}
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for attempt := 0; attempt < 2; attempt++ {
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r.mutex.Lock()
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p := r.providers[id.BusName]
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if p == nil || p.ctx.Err() != nil || p.notice.ID() != id {
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r.mutex.Unlock()
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return nil, ErrReviewUnavailable
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}
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notice, lifetime, connection, call := p.notice, p.ctx, r.service, r.captureCall
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r.mutex.Unlock()
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if connection == nil && call == nil {
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return nil, ErrReviewUnavailable
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}
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callCtx, callCancel := context.WithCancel(ctx)
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stop := context.AfterFunc(lifetime, callCancel)
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var fields map[string]dbus.Variant
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var err error
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if call != nil {
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fields, err = call(callCtx, id.BusName, notice.Path, notice)
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} else {
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reply := connection.Object(id.BusName, notice.Path).CallWithContext(callCtx, ReviewInterface+".CaptureWindow", 0, notice.Window, notice.Focus, notice.Revision)
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err = reply.Err
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if err == nil {
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// Store rebuilds variants from their decoded Go values and loses
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// tuple signatures. Validate the original owned reply body.
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if len(reply.Body) != 1 {
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err = ErrReviewInvalid
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} else {
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var ok bool
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fields, ok = reply.Body[0].(map[string]dbus.Variant)
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if !ok {
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err = ErrReviewInvalid
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}
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}
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}
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}
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stop()
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callCancel()
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if err != nil {
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return nil, err
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}
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if ctx.Err() != nil {
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return nil, ctx.Err()
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}
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snapshot, err := DecodeReviewSnapshot(fields)
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if errors.Is(err, ErrReviewStale) && attempt == 0 {
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continue
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}
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if err != nil {
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return nil, err
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}
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if snapshot.Instance != notice.Instance || snapshot.Window != notice.Window || snapshot.Focus != notice.Focus || snapshot.Revision != notice.Revision || snapshot.Bounds != notice.Bounds {
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return nil, ErrReviewStale
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}
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r.mutex.Lock()
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if r.providers[id.BusName] != p || p.notice != notice || lifetime.Err() != nil {
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r.mutex.Unlock()
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return nil, ErrReviewStale
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}
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tree, _, err := ApplyReviewSnapshot(p.trees[notice.Window], snapshot, id.BusName)
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if err == nil {
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p.trees[notice.Window] = tree
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}
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r.mutex.Unlock()
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return tree, err
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}
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return nil, ErrReviewStale
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}
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