fix(ingestor): abort multipart upload on reassembly failure (#243)

crates/ingestor/src/handlers.rs

@@ -189,29 +189,43 @@ pub async fn complete_upload(
     let mut writer = WriteMultipart::new(upload);
 
     let mut total_bytes: usize = 0;
+    // Stream each part into the multipart writer. If any part fetch fails,
+    // abort the multipart upload to prevent orphaned uploads on S3/GCS.
     for n in 0..num_parts {
         let part_key = StorePath::from(format!("raw/{video_id}/part_{n}").as_str());
-        let data = state
-            .store
-            .get(&part_key)
-            .await
-            .map_err(|e| IngestorError::Storage {
-                message: format!("missing part {n}: {e}"),
-            })?
-            .bytes()
-            .await
-            .map_err(|e| IngestorError::Storage {
-                message: e.to_string(),
-            })?;
+        let data = match state.store.get(&part_key).await {
+            Ok(result) => match result.bytes().await {
+                Ok(bytes) => bytes,
+                Err(e) => {
+                    warn!(video_id, part = n, error = %e, "aborting multipart upload: failed to read part bytes");
+                    writer.abort().await.ok();
+                    return Err(IngestorError::Storage {
+                        message: e.to_string(),
+                    });
+                }
+            },
+            Err(e) => {
+                warn!(video_id, part = n, error = %e, "aborting multipart upload: missing part");
+                writer.abort().await.ok();
+                return Err(IngestorError::Storage {
+                    message: format!("missing part {n}: {e}"),
+                });
+            }
+        };
         total_bytes += data.len();
         // Feed bytes into the multipart writer without copying; each chunk is
         // flushed to storage once the internal buffer reaches its threshold.
         writer.put(data);
     }
 
-    writer.finish().await.map_err(|e| IngestorError::Storage {
-        message: e.to_string(),
-    })?;
+    if let Err(e) = writer.finish().await {
+        warn!(video_id, error = %e, "aborting multipart upload: finish failed");
+        // finish() already calls abort internally on failure in recent
+        // object_store versions, but we log the error for observability.
+        return Err(IngestorError::Storage {
+            message: e.to_string(),
+        });
+    }
 
     // Clean up individual parts
     for n in 0..num_parts {