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perf: cache link previews

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Changelog-Added: Cache link previews
This commit is contained in:
William Casarin
2023-01-02 15:18:42 -08:00
parent b42f0ec5eb
commit 7372c4847d
11 changed files with 38 additions and 16 deletions
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24
damus/Views/NoteContentView.swift
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@@ -61,12 +61,13 @@ struct NoteContentView: View {
let privkey: String?
let event: NostrEvent
let profiles: Profiles
let previews: PreviewCache
let show_images: Bool
@State var artifacts: NoteArtifacts
@State var metaData: LPLinkMetadata? = nil
@State var preview: LinkViewRepresentable? = nil
let size: EventViewKind
func MainContent() -> some View {
@@ -89,8 +90,8 @@ struct NoteContentView: View {
InvoicesView(invoices: artifacts.invoices)
}
if show_images, self.metaData != nil {
LinkViewRepresentable(metadata: self.metaData)
if show_images, self.preview != nil {
self.preview
} else {
ForEach(artifacts.links, id:\.self) { link in
LinkViewRepresentable(url: link)
@@ -123,9 +124,22 @@ struct NoteContentView: View {
}
}
.task {
if let preview = previews.lookup(self.event.id) {
switch preview {
case .value(let view):
self.preview = view
case .failed:
// don't try to refetch meta if we've failed
return
}
}
if show_images, artifacts.links.count == 1 {
let meta = await getMetaData(for: artifacts.links.first!)
self.metaData = await getMetaData(for: artifacts.links.first!)
let view = LinkViewRepresentable(metadata: meta)
previews.store(evid: self.event.id, preview: view)
self.preview = view
}
}
}
@@ -170,6 +184,6 @@ struct NoteContentView_Previews: PreviewProvider {
let state = test_damus_state()
let content = "hi there https://jb55.com/s/Oct12-150217.png 5739a762ef6124dd.jpg"
let artifacts = NoteArtifacts(content: content, images: [], invoices: [], links: [])
NoteContentView(privkey: "", event: NostrEvent(content: content, pubkey: "pk"), profiles: state.profiles, show_images: true, artifacts: artifacts, size: .normal)
NoteContentView(privkey: "", event: NostrEvent(content: content, pubkey: "pk"), profiles: state.profiles, previews: PreviewCache(), show_images: true, artifacts: artifacts, size: .normal)
}
}