[Session] Drill getAgent into feed APIs (#3701)

* Update to desired post-feed usage

* Drill agent into feed apis

* Thread getAgent instead

---------

Co-authored-by: Dan Abramov <dan.abramov@gmail.com>

src/lib/api/feed/home.ts

@@ -1,8 +1,9 @@
-import {AppBskyFeedDefs} from '@atproto/api'
-import {FeedAPI, FeedAPIResponse} from './types'
-import {FollowingFeedAPI} from './following'
-import {CustomFeedAPI} from './custom'
+import {AppBskyFeedDefs, BskyAgent} from '@atproto/api'
+
 import {PROD_DEFAULT_FEED} from '#/lib/constants'
+import {CustomFeedAPI} from './custom'
+import {FollowingFeedAPI} from './following'
+import {FeedAPI, FeedAPIResponse} from './types'
 
 // HACK
 // the feed API does not include any facilities for passing down
@@ -26,19 +27,27 @@ export const FALLBACK_MARKER_POST: AppBskyFeedDefs.FeedViewPost = {
 }
 
 export class HomeFeedAPI implements FeedAPI {
+  getAgent: () => BskyAgent
   following: FollowingFeedAPI
   discover: CustomFeedAPI
   usingDiscover = false
   itemCursor = 0
 
-  constructor() {
-    this.following = new FollowingFeedAPI()
-    this.discover = new CustomFeedAPI({feed: PROD_DEFAULT_FEED('whats-hot')})
+  constructor({getAgent}: {getAgent: () => BskyAgent}) {
+    this.getAgent = getAgent
+    this.following = new FollowingFeedAPI({getAgent})
+    this.discover = new CustomFeedAPI({
+      getAgent,
+      feedParams: {feed: PROD_DEFAULT_FEED('whats-hot')},
+    })
   }
 
   reset() {
-    this.following = new FollowingFeedAPI()
-    this.discover = new CustomFeedAPI({feed: PROD_DEFAULT_FEED('whats-hot')})
+    this.following = new FollowingFeedAPI({getAgent: this.getAgent})
+    this.discover = new CustomFeedAPI({
+      getAgent: this.getAgent,
+      feedParams: {feed: PROD_DEFAULT_FEED('whats-hot')},
+    })
     this.usingDiscover = false
     this.itemCursor = 0
   }