pfps: load profile pics in the background

So we don't get annoying popping artifacts when scrolling

Changelog-Fixed: Profile pics are now loaded in the background
Signed-off-by: William Casarin <jb55@jb55.com>

damus/Models/FollowersModel.swift

@@ -79,7 +79,7 @@ class FollowersModel: ObservableObject {
                 if ev.known_kind == .contacts {
                     handle_contact_event(ev)
                 } else if ev.known_kind == .metadata {
-                    process_metadata_event(profiles: self.damus_state.profiles, ev: ev)
+                    process_metadata_event(image_cache: damus_state.image_cache, profiles: damus_state.profiles, ev: ev)
                 }
                 
             case .notice(let msg):

damus/Models/FollowingModel.swift

@@ -60,7 +60,7 @@ class FollowingModel {
             switch nev {
             case .event(_, let ev):
                 if ev.kind == 0 {
-                    process_metadata_event(profiles: damus_state.profiles, ev: ev)
+                    process_metadata_event(image_cache: damus_state.image_cache, profiles: damus_state.profiles, ev: ev)
                 }
             case .notice(let msg):
                 print("followingmodel notice: \(msg)")

damus/Models/HomeModel.swift

@@ -6,6 +6,7 @@
 //
 
 import Foundation
+import UIKit
 
 struct NewEventsBits {
     let bits: Int
@@ -300,7 +301,7 @@ class HomeModel: ObservableObject {
     }
 
     func handle_metadata_event(_ ev: NostrEvent) {
-        process_metadata_event(profiles: damus_state.profiles, ev: ev)
+        process_metadata_event(image_cache: damus_state.image_cache, profiles: damus_state.profiles, ev: ev)
     }
 
     func get_last_event_of_kind(relay_id: String, kind: Int) -> NostrEvent? {
@@ -489,7 +490,7 @@ func print_filters(relay_id: String?, filters groups: [[NostrFilter]]) {
     print("-----")
 }
 
-func process_metadata_event(profiles: Profiles, ev: NostrEvent) {
+func process_metadata_event(image_cache: ImageCache, profiles: Profiles, ev: NostrEvent) {
     guard let profile: Profile = decode_data(Data(ev.content.utf8)) else {
         return
     }
@@ -503,7 +504,19 @@ func process_metadata_event(profiles: Profiles, ev: NostrEvent) {
 
     let tprof = TimestampedProfile(profile: profile, timestamp: ev.created_at)
     profiles.add(id: ev.pubkey, profile: tprof)
-
+    
+    // load pfps asap
+    let picture = tprof.profile.picture ?? "https://robohash.org/\(ev.pubkey)"
+    if let url = URL(string: picture) {
+        Task<UIImage?, Never>.init(priority: .background) {
+            let res = await load_image(cache: image_cache, from: url)
+            DispatchQueue.main.async {
+                notify(.profile_updated, ProfileUpdate(pubkey: ev.pubkey, profile: profile))
+            }
+            return res
+        }
+    }
+    
     notify(.profile_updated, ProfileUpdate(pubkey: ev.pubkey, profile: profile))
 }
 

damus/Models/SearchHomeModel.swift

@@ -14,15 +14,13 @@ class SearchHomeModel: ObservableObject {
     @Published var loading: Bool = false
 
     var seen_pubkey: Set<String> = Set()
-    let profiles: Profiles
-    let pool: RelayPool
+    let damus_state: DamusState
     let base_subid = UUID().description
     let profiles_subid = UUID().description
     let limit: UInt32 = 250
     
-    init(pool: RelayPool, profiles: Profiles) {
-        self.pool = pool
-        self.profiles = profiles
+    init(damus_state: DamusState) {
+        self.damus_state = damus_state
     }
     
     func get_base_filter() -> NostrFilter {
@@ -34,21 +32,21 @@ class SearchHomeModel: ObservableObject {
     
     func subscribe() {
         loading = true
-        pool.subscribe(sub_id: base_subid, filters: [get_base_filter()], handler: handle_event)
+        damus_state.pool.subscribe(sub_id: base_subid, filters: [get_base_filter()], handler: handle_event)
     }
 
     func unsubscribe() {
         loading = false
-        pool.unsubscribe(sub_id: base_subid)
+        damus_state.pool.unsubscribe(sub_id: base_subid)
     }
     
     func load_profiles(relay_id: String) {
         var filter = NostrFilter.filter_profiles
-        let authors = find_profiles_to_fetch(profiles: profiles, events: events)
+        let authors = find_profiles_to_fetch(profiles: damus_state.profiles, events: events)
         filter.authors = authors
         
         if !authors.isEmpty {
-            pool.subscribe(sub_id: profiles_subid, filters: [filter], handler: handle_event)
+            damus_state.pool.subscribe(sub_id: profiles_subid, filters: [filter], handler: handle_event)
         }
     }
     
@@ -71,7 +69,7 @@ class SearchHomeModel: ObservableObject {
                         $0.created_at > $1.created_at
                     }
                 } else if ev.known_kind == .metadata {
-                    process_metadata_event(profiles: self.profiles, ev: ev)
+                    process_metadata_event(image_cache: damus_state.image_cache, profiles: damus_state.profiles, ev: ev)
                 }
             case .notice(let msg):
                 print("search home notice: \(msg)")
@@ -81,7 +79,7 @@ class SearchHomeModel: ObservableObject {
                 if sub_id == self.base_subid {
                     load_profiles(relay_id: relay_id)
                 } else if sub_id == self.profiles_subid {
-                    pool.unsubscribe(sub_id: self.profiles_subid)
+                    damus_state.pool.unsubscribe(sub_id: self.profiles_subid)
                 }
                 
                 break