Add profile info caching

src/state/models/profiles-view.ts

@@ -0,0 +1,44 @@
+import {makeAutoObservable} from 'mobx'
+import {LRUMap} from 'lru_map'
+import {RootStoreModel} from './root-store'
+import * as GetProfile from '../../third-party/api/src/client/types/app/bsky/actor/getProfile'
+
+type CacheValue = Promise<GetProfile.Response> | GetProfile.Response
+export class ProfilesViewModel {
+  cache: LRUMap<string, CacheValue> = new LRUMap(100)
+
+  constructor(public rootStore: RootStoreModel) {
+    makeAutoObservable(
+      this,
+      {
+        rootStore: false,
+        cache: false,
+      },
+      {autoBind: true},
+    )
+  }
+
+  // public api
+  // =
+
+  async getProfile(did: string) {
+    const cached = this.cache.get(did)
+    if (cached) {
+      try {
+        return await cached
+      } catch (e) {
+        // ignore, we'll try again
+      }
+    }
+    try {
+      const promise = this.rootStore.api.app.bsky.actor.getProfile({actor: did})
+      this.cache.set(did, promise)
+      const res = await promise
+      this.cache.set(did, res)
+      return res
+    } catch (e) {
+      this.cache.delete(did)
+      throw e
+    }
+  }
+}

src/state/models/root-store.ts

@@ -10,6 +10,7 @@ import {isObj, hasProp} from '../lib/type-guards'
 import {SessionModel} from './session'
 import {NavigationModel} from './navigation'
 import {ShellUiModel} from './shell-ui'
+import {ProfilesViewModel} from './profiles-view'
 import {MeModel} from './me'
 import {OnboardModel} from './onboard'
 
@@ -19,6 +20,7 @@ export class RootStoreModel {
   shell = new ShellUiModel()
   me = new MeModel(this)
   onboard = new OnboardModel()
+  profiles = new ProfilesViewModel(this)
 
   constructor(public api: SessionServiceClient) {
     makeAutoObservable(this, {

src/view/com/util/UserInfoText.tsx

@@ -33,8 +33,7 @@ export function UserInfoText({
 
   useEffect(() => {
     let aborted = false
-    // TODO use caching to reduce loads
-    store.api.app.bsky.actor.getProfile({actor: did}).then(
+    store.profiles.getProfile(did).then(
       v => {
         if (aborted) return
         setProfile(v.data)