Update StatsDataSource.lastOpenedUri & responseHeader in finally

This ensures these values are still updated even if the delegate
`DataSource.open()` throws an exception (e.g. an HTTP 404).

PiperOrigin-RevId: 685687810

libraries/datasource/src/main/java/androidx/media3/datasource/StatsDataSource.java

@@ -83,10 +83,18 @@ public final class StatsDataSource implements DataSource {
     // Reassign defaults in case dataSource.open throws an exception.
     lastOpenedUri = dataSpec.uri;
     lastResponseHeaders = Collections.emptyMap();
-    long availableBytes = dataSource.open(dataSpec);
-    lastOpenedUri = Assertions.checkNotNull(getUri());
-    lastResponseHeaders = getResponseHeaders();
-    return availableBytes;
+    try {
+      return dataSource.open(dataSpec);
+    } finally {
+      // TODO: b/373321956 - Remove this null-tolerance when we've fixed all DataSource
+      //  implementations to return a non-null URI after a failed open() call and before close()
+      //  (and updated the DataSourceContractTest to enforce this).
+      Uri upstreamUri = getUri();
+      if (upstreamUri != null) {
+        lastOpenedUri = upstreamUri;
+      }
+      lastResponseHeaders = getResponseHeaders();
+    }
   }
 
   @Override

libraries/datasource/src/test/java/androidx/media3/datasource/StatsDataSourceTest.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package androidx.media3.datasource;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.junit.Assert.assertThrows;
+
+import android.net.Uri;
+import androidx.media3.test.utils.FakeDataSet;
+import androidx.media3.test.utils.FakeDataSource;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import java.io.IOException;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+public final class StatsDataSourceTest {
+
+  @Test
+  public void getLastOpenedUri_openSucceeds_returnsRedirectedUriAfterClosure() throws Exception {
+    Uri redirectedUri = Uri.parse("bar");
+    FakeDataSet fakeDataSet = new FakeDataSet();
+    fakeDataSet.setRandomData(redirectedUri, /* length= */ 10);
+    StatsDataSource statsDataSource =
+        new StatsDataSource(
+            new ResolvingDataSource(
+                new FakeDataSource(fakeDataSet),
+                dataSpec -> dataSpec.buildUpon().setUri(redirectedUri).build()));
+
+    statsDataSource.open(new DataSpec(Uri.parse("foo")));
+    statsDataSource.close();
+
+    assertThat(statsDataSource.getLastOpenedUri()).isEqualTo(redirectedUri);
+  }
+
+  @Test
+  public void getLastOpenedUri_openFails_returnsRedirectedUriAfterClosure() throws Exception {
+    Uri redirectedUri = Uri.parse("bar");
+    StatsDataSource statsDataSource =
+        new StatsDataSource(
+            new ResolvingDataSource(
+                new FakeDataSource(),
+                dataSpec -> dataSpec.buildUpon().setUri(redirectedUri).build()));
+
+    assertThrows(IOException.class, () -> statsDataSource.open(new DataSpec(Uri.parse("foo"))));
+    statsDataSource.close();
+
+    assertThat(statsDataSource.getLastOpenedUri()).isEqualTo(redirectedUri);
+  }
+}