questions: add QuestionsConverterAsyncForStream

app_async/src/main.rs

@@ -16,7 +16,8 @@ use tokio::{fs, io};
 use tokio_stream::wrappers::UnboundedReceiverStream;
 
 use chgk_ledb_lib::async_db;
-use chgk_ledb_lib::questions::{Question, QuestionsConverterAsync};
+use chgk_ledb_lib::questions::Question;
+use chgk_ledb_lib::questions::QuestionsConverterAsyncForStream;
 use chgk_ledb_lib::source::ReadSourceQuestionsBatchesAsync;
 
 const ZIP_FILENAME: &str = "json.zip";
@@ -56,7 +57,7 @@ async fn zip_reader_task(tx: UnboundedSender<Question>) {
     let source_questions = source_questions.stream();
     pin_mut!(source_questions);
 
-    let converter = QuestionsConverterAsync::from(source_questions).convert();
+    let converter = source_questions.converter().convert();
     pin_mut!(converter);
 
     let mut num: u32 = 0;
@@ -97,7 +98,7 @@ async fn read_from_zip(file_num: usize, mut num: usize) -> Option<Question> {
     let src = source.get(file_index).await;
     let src = stream::once(async { src.expect("get source file") });
     pin_mut!(src);
-    let converter = QuestionsConverterAsync::from(src);
+    let converter = src.converter();
     let questions: Vec<_> = converter.convert().collect().await;
     if num == 0 {
         num = (1..=questions.len()).choose(&mut rng).unwrap();

lib/src/questions.rs

@@ -224,6 +224,24 @@ pub mod convert_async {
         }
     }
 
+    pub trait QuestionsConverterAsyncForStream<T>
+    where
+        T: Stream<Item = (String, Result<SourceQuestionsBatch, serde_json::Error>)>
+            + std::marker::Unpin,
+    {
+        fn converter(&mut self) -> QuestionsConverterAsync<&mut T>;
+    }
+
+    impl<T> QuestionsConverterAsyncForStream<T> for T
+    where
+        T: Stream<Item = (String, Result<SourceQuestionsBatch, serde_json::Error>)>
+            + std::marker::Unpin,
+    {
+        fn converter(&mut self) -> QuestionsConverterAsync<&mut T> {
+            QuestionsConverterAsync::from(self)
+        }
+    }
+
     impl<T> QuestionsConverterAsync<T>
     where
         T: Stream<Item = (String, Result<SourceQuestionsBatch, serde_json::Error>)>
@@ -267,7 +285,7 @@ pub mod convert_async {
             });
 
             pin_mut!(source);
-            let converter = QuestionsConverterAsync::from(source);
+            let converter = source.converter();
             let converter = converter.convert();
             let converted: Vec<_> = converter.collect().await;
             assert_yaml_snapshot!(converted, @r#"
@@ -292,7 +310,7 @@ pub mod convert_async {
     }
 }
 #[cfg(feature = "convert_async")]
-pub use convert_async::QuestionsConverterAsync;
+pub use convert_async::{QuestionsConverterAsync, QuestionsConverterAsyncForStream};
 
 #[cfg(test)]
 mod test {