fix app_async

app_async/src/main.rs

@@ -1,12 +1,12 @@
 extern crate serde_json;
 use clap::{Parser, Subcommand};
-use futures::{Future, pin_mut};
+use futures::{pin_mut, Future};
 use rand::distributions::Uniform;
 use rand::seq::IteratorRandom;
 use rand::{thread_rng, Rng};
 
 use async_zip::tokio::read::seek::ZipFileReader;
-use futures::stream::StreamExt;
+use futures::stream::{self, StreamExt};
 use std::time::Instant;
 use tokio::sync::mpsc::{self, UnboundedReceiver, UnboundedSender};
 
@@ -53,10 +53,10 @@ async fn zip_reader_task(tx: UnboundedSender<Question>) {
         .await
         .expect("open zip file reader");
     let mut source_questions = archive.source_questions();
-    let mut source_questions = source_questions.stream();
+    let source_questions = source_questions.stream();
     pin_mut!(source_questions);
 
-    let mut converter = QuestionsConverterAsync::from(source_questions).convert();
+    let converter = QuestionsConverterAsync::from(source_questions).convert();
     pin_mut!(converter);
 
     let mut num: u32 = 0;
@@ -85,23 +85,26 @@ async fn read_from_zip(file_num: usize, mut num: usize) -> Option<Question> {
         .await
         .expect("open zip file reader");
 
-    let files_count = archive.file().entries().len();
+    let mut source = archive.source_questions();
+    let files_count = source.len();
     let file_index = if file_num == 0 {
         let files = Uniform::new(0, files_count);
         rng.sample(files)
     } else {
         file_num - 1
     };
-    let mut source_questions = archive.source_questions();
-    let mut source_questions = source_questions.stream();
-    pin_mut!(source_questions);
-    let src = source_questions.skip(file_index).take(1);
+
+    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 questions: Vec<_> = converter.convert().collect().await;
     if num == 0 {
         num = (1..=questions.len()).choose(&mut rng).unwrap();
     }
-    Some(questions[num - 1].clone())
+    let mut question = questions.get(num - 1).expect("get question").clone();
+    question.num = num as u32;
+    Some(question)
 }
 
 // measure and return time elapsed in `fut` in seconds
@@ -162,7 +165,7 @@ async fn read_from_db(id: u32) -> Option<Question> {
         Err(e) => {
             println!("{:#?}", e); // DEBUG
             None
-        },
+        }
     }
 }
 async fn write_db() {