fix: A/B test 4, video tab on the trending page

codegen/src/abtest.rs

@@ -15,6 +15,7 @@ pub enum ABTest {
     AttributedTextDescription = 1,
     ThreeTabChannelLayout = 2,
     ChannelHandlesInSearchResults = 3,
+    TrendsVideoTab = 4,
 }
 
 const TESTS_TO_RUN: [ABTest; 2] = [
@@ -38,6 +39,15 @@ struct QVideo<'a> {
     racy_check_ok: bool,
 }
 
+#[derive(Debug, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct QBrowse<'a> {
+    context: YTContext<'a>,
+    browse_id: &'a str,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    params: Option<&'a str>,
+}
+
 pub async fn run_test(
     ab: ABTest,
     n: usize,
@@ -72,6 +82,7 @@ pub async fn run_test(
                     ABTest::ChannelHandlesInSearchResults => {
                         channel_handles_in_search_results(&rp, &visitor_data).await
                     }
+                    ABTest::TrendsVideoTab => trends_video_tab(&rp, &visitor_data).await,
                 }
                 .unwrap();
                 pb.inc(1);
@@ -170,3 +181,21 @@ pub async fn channel_handles_in_search_results(rp: &RustyPipe, visitor_data: &st
         _ => false,
     }))
 }
+
+pub async fn trends_video_tab(rp: &RustyPipe, visitor_data: &str) -> Result<bool> {
+    let query = rp.query().visitor_data(visitor_data);
+    let context = query.get_context(ClientType::Desktop, true, None).await;
+    let res = query
+        .raw(
+            ClientType::Desktop,
+            "browse",
+            &QBrowse {
+                context,
+                browse_id: "FEtrending",
+                params: None,
+            },
+        )
+        .await?;
+
+    Ok(res.contains("\"4gIOGgxtb3N0X3BvcHVsYXI%3D\""))
+}

codegen/src/main.rs

@@ -81,8 +81,14 @@ async fn main() {
                         n,
                         occurrences as f32 / n as f32 * 100.0
                     );
-                    eprintln!("visitor_data (present): {vd_present:?}");
-                    eprintln!("visitor_data (absent):  {vd_absent:?}");
+                    eprintln!(
+                        "visitor_data (present): {}",
+                        vd_present.as_deref().unwrap_or("n/a")
+                    );
+                    eprintln!(
+                        "visitor_data (absent):  {}",
+                        vd_absent.as_deref().unwrap_or("n/a")
+                    );
                 }
                 None => {
                     let res = abtest::run_all_tests(n, cli.concurrency).await;

notes/AB_Tests.md

@@ -266,3 +266,23 @@ Note that channels without handles still use the old data model, even on the sam
   }
 }
 ```
+
+## [4] Video tab on the Trending page
+
+- **Encountered on:** 1.04.2023
+- **Impact:** 🟢 Low
+- **Endpoint:** browse (trending videos)
+
+YouTube moved the list of trending videos from the main *trending* page to a
+separate tab (Videos).
+
+The video tab is fetched with the params `4gIOGgxtb3N0X3BvcHVsYXI%3D`. The data model
+of the video tab did not change.
+
+**OLD**
+
+![A/B test 4 old screenshot](./_img/ab_4_old.png)
+
+**NEW**
+
+![A/B test 4 old screenshot](./_img/ab_4_new.png)

src/client/trends.rs

@@ -8,7 +8,7 @@ use crate::{
     util::TryRemove,
 };
 
-use super::{response, ClientType, MapResponse, QBrowse, RustyPipeQuery};
+use super::{response, ClientType, MapResponse, QBrowse, QBrowseParams, RustyPipeQuery};
 
 impl RustyPipeQuery {
     /// Get the videos from the YouTube startpage
@@ -32,9 +32,10 @@ impl RustyPipeQuery {
     /// Get the videos from the YouTube trending page
     pub async fn trending(&self) -> Result<Vec<VideoItem>, Error> {
         let context = self.get_context(ClientType::Desktop, true, None).await;
-        let request_body = QBrowse {
+        let request_body = QBrowseParams {
             context,
             browse_id: "FEtrending",
+            params: "4gIOGgxtb3N0X3BvcHVsYXI%3D",
         };
 
         self.execute_request::<response::Trending, _, _>(

tests/youtube.rs

@@ -91,12 +91,12 @@ fn get_player_from_client(#[case] client_type: ClientType, rp: RustyPipe) {
             .video_only_streams
             .into_iter()
             .find(|s| s.itag == 398)
-            .unwrap();
+            .expect("video stream not found");
         let audio = player_data
             .audio_streams
             .into_iter()
             .find(|s| s.itag == 251)
-            .unwrap();
+            .expect("audio stream not found");
 
         assert_approx(video.bitrate as f64, 1340829.0);
         assert_approx(video.average_bitrate as f64, 1233444.0);
@@ -1172,7 +1172,7 @@ fn startpage(rp: RustyPipe) {
 fn trending(rp: RustyPipe) {
     let result = tokio_test::block_on(rp.query().trending()).unwrap();
 
-    assert_gte(result.len(), 50, "items");
+    assert_gte(result.len(), 40, "items");
 }
 
 //#MUSIC