feat(dependencies): add async-stream and bytes to Cargo.toml and Cargo.lock

refactor(adapters): update diary.rs to use BoxStream from futures

Cargo.lock

@@ -314,6 +314,7 @@ name = "application"
 version = "0.1.0"
 dependencies = [
  "async-trait",
+ "bytes",
  "chrono",
  "domain",
  "futures",
@@ -567,6 +568,28 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "async-stream"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b5a71a6f37880a80d1d7f19efd781e4b5de42c88f0722cc13bcb6cc2cfe8476"
+dependencies = [
+ "async-stream-impl",
+ "futures-core",
+ "pin-project-lite",
+]
+
+[[package]]
+name = "async-stream-impl"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7c24de15d275a1ecfd47a380fb4d5ec9bfe0933f309ed5e705b775596a3574d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+]
+
 [[package]]
 name = "async-task"
 version = "4.7.1"
@@ -1822,9 +1845,12 @@ dependencies = [
 name = "export"
 version = "0.1.0"
 dependencies = [
+ "async-stream",
  "async-trait",
+ "bytes",
  "chrono",
  "domain",
+ "futures",
  "serde_json",
  "tokio",
  "uuid",
@@ -3848,9 +3874,12 @@ name = "postgres"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "async-stream",
  "async-trait",
+ "bytes",
  "chrono",
  "domain",
+ "futures",
  "serde",
  "serde_json",
  "sqlx",
@@ -5124,9 +5153,12 @@ name = "sqlite"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "async-stream",
  "async-trait",
+ "bytes",
  "chrono",
  "domain",
+ "futures",
  "serde",
  "serde_json",
  "sqlx",

Cargo.toml

@@ -38,6 +38,7 @@ resolver = "2"
 tokio = { version = "1.0", features = ["macros", "net", "rt", "rt-multi-thread", "sync", "time"] }
 bytes = "1"
 futures = "0.3"
+async-stream = "0.3"
 dotenvy = "0.15"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"

crates/adapters/export/Cargo.toml

@@ -8,6 +8,9 @@ domain = { workspace = true }
 async-trait = { workspace = true }
 serde_json = { workspace = true }
 chrono = { workspace = true }
+futures = { workspace = true }
+bytes = { workspace = true }
+async-stream = { workspace = true }
 
 [dev-dependencies]
 uuid = { workspace = true }

crates/adapters/export/src/lib.rs

@@ -1,51 +1,89 @@
-use async_trait::async_trait;
+use bytes::Bytes;
 use domain::{
     errors::DomainError,
     models::{DiaryEntry, ExportFormat},
     ports::DiaryExporter,
 };
+use futures::stream::BoxStream;
 
 pub struct ExportAdapter;
 
-#[async_trait]
 impl DiaryExporter for ExportAdapter {
-    async fn serialize_entries(
+    fn stream_entries(
         &self,
-        entries: &[DiaryEntry],
+        stream: BoxStream<'static, Result<DiaryEntry, DomainError>>,
         format: ExportFormat,
-    ) -> Result<Vec<u8>, DomainError> {
+    ) -> BoxStream<'static, Result<Bytes, DomainError>> {
         match format {
-            ExportFormat::Csv => serialize_csv(entries),
-            ExportFormat::Json => serialize_json(entries),
+            ExportFormat::Csv => stream_csv(stream),
+            ExportFormat::Json => stream_json(stream),
         }
     }
 }
 
-fn serialize_csv(entries: &[DiaryEntry]) -> Result<Vec<u8>, DomainError> {
-    let mut out =
-        String::from("title,year,director,rating,comment,watched_at,external_metadata_id\n");
-    for e in entries {
-        let title = csv_escape(e.movie().title().value());
-        let year = e.movie().release_year().value();
-        let director = e.movie().director().map(csv_escape).unwrap_or_default();
-        let rating = e.review().rating().value();
-        let comment = e
-            .review()
-            .comment()
-            .map(|c| csv_escape(c.value()))
-            .unwrap_or_default();
-        let watched_at = e.review().watched_at().format("%Y-%m-%d");
-        let ext_id = e
-            .movie()
-            .external_metadata_id()
-            .map(|id| id.value().to_string())
-            .unwrap_or_default();
-        out.push_str(&format!(
-            "{},{},{},{},{},{},{}\n",
-            title, year, director, rating, comment, watched_at, ext_id
-        ));
-    }
-    Ok(out.into_bytes())
+fn stream_csv(
+    entries: BoxStream<'static, Result<DiaryEntry, DomainError>>,
+) -> BoxStream<'static, Result<Bytes, DomainError>> {
+    use futures::StreamExt;
+    let header = futures::stream::once(async {
+        Ok(Bytes::from_static(
+            b"title,year,director,rating,comment,watched_at,external_metadata_id\n",
+        ))
+    });
+    let rows = entries.map(|r| r.map(|e| Bytes::from(csv_row(&e))));
+    Box::pin(header.chain(rows))
+}
+
+fn stream_json(
+    stream: BoxStream<'static, Result<DiaryEntry, DomainError>>,
+) -> BoxStream<'static, Result<Bytes, DomainError>> {
+    Box::pin(async_stream::stream! {
+        futures::pin_mut!(stream);
+        let mut is_first = true;
+        while let Some(r) = futures::StreamExt::next(&mut stream).await {
+            match r {
+                Err(e) => { yield Err(e); return; }
+                Ok(entry) => {
+                    let json = serde_json::to_string(&entry_to_json(&entry))
+                        .map_err(|e| DomainError::InfrastructureError(e.to_string()));
+                    let json = match json {
+                        Ok(s) => s,
+                        Err(e) => { yield Err(e); return; }
+                    };
+                    let prefix = if is_first { "[" } else { "," };
+                    is_first = false;
+                    yield Ok(Bytes::from(format!("{}{}", prefix, json)));
+                }
+            }
+        }
+        if is_first {
+            yield Ok(Bytes::from_static(b"[]"));
+        } else {
+            yield Ok(Bytes::from_static(b"]"));
+        }
+    })
+}
+
+fn csv_row(e: &DiaryEntry) -> String {
+    let title = csv_escape(e.movie().title().value());
+    let year = e.movie().release_year().value();
+    let director = e.movie().director().map(csv_escape).unwrap_or_default();
+    let rating = e.review().rating().value();
+    let comment = e
+        .review()
+        .comment()
+        .map(|c| csv_escape(c.value()))
+        .unwrap_or_default();
+    let watched_at = e.review().watched_at().format("%Y-%m-%d");
+    let ext_id = e
+        .movie()
+        .external_metadata_id()
+        .map(|id| id.value().to_string())
+        .unwrap_or_default();
+    format!(
+        "{},{},{},{},{},{},{}\n",
+        title, year, director, rating, comment, watched_at, ext_id
+    )
 }
 
 fn csv_escape(s: &str) -> String {
@@ -56,22 +94,16 @@ fn csv_escape(s: &str) -> String {
     }
 }
 
-fn serialize_json(entries: &[DiaryEntry]) -> Result<Vec<u8>, DomainError> {
-    let arr: Vec<serde_json::Value> = entries
-        .iter()
-        .map(|e| {
-            serde_json::json!({
-                "title": e.movie().title().value(),
-                "year": e.movie().release_year().value(),
-                "director": e.movie().director(),
-                "rating": e.review().rating().value(),
-                "comment": e.review().comment().map(|c| c.value()),
-                "watched_at": e.review().watched_at().format("%Y-%m-%d").to_string(),
-                "external_metadata_id": e.movie().external_metadata_id().map(|id| id.value()),
-            })
-        })
-        .collect();
-    serde_json::to_vec_pretty(&arr).map_err(|e| DomainError::InfrastructureError(e.to_string()))
+fn entry_to_json(e: &DiaryEntry) -> serde_json::Value {
+    serde_json::json!({
+        "title": e.movie().title().value(),
+        "year": e.movie().release_year().value(),
+        "director": e.movie().director(),
+        "rating": e.review().rating().value(),
+        "comment": e.review().comment().map(|c| c.value().to_string()),
+        "watched_at": e.review().watched_at().format("%Y-%m-%d").to_string(),
+        "external_metadata_id": e.movie().external_metadata_id().map(|id| id.value().to_string()),
+    })
 }
 
 #[cfg(test)]

crates/adapters/export/src/tests/lib.rs

@@ -5,6 +5,27 @@ use domain::{
     value_objects::{ExternalMetadataId, MovieTitle, Rating, ReleaseYear},
 };
 
+async fn collect_stream(
+    stream: futures::stream::BoxStream<'static, Result<bytes::Bytes, domain::errors::DomainError>>,
+) -> Vec<u8> {
+    use futures::StreamExt;
+    let mut out = Vec::new();
+    futures::pin_mut!(stream);
+    while let Some(chunk) = stream.next().await {
+        out.extend_from_slice(&chunk.unwrap());
+    }
+    out
+}
+
+fn entry_stream(
+    entries: Vec<domain::models::DiaryEntry>,
+) -> futures::stream::BoxStream<
+    'static,
+    Result<domain::models::DiaryEntry, domain::errors::DomainError>,
+> {
+    Box::pin(futures::stream::iter(entries.into_iter().map(Ok)))
+}
+
 fn make_entry(
     title: &str,
     year: u16,
@@ -55,10 +76,8 @@ async fn csv_has_header_and_one_row() {
         5,
         Some("great"),
     );
-    let bytes = adapter
-        .serialize_entries(&[entry], ExportFormat::Csv)
-        .await
-        .unwrap();
+    let bytes =
+        collect_stream(adapter.stream_entries(entry_stream(vec![entry]), ExportFormat::Csv)).await;
     let text = String::from_utf8(bytes).unwrap();
     assert!(
         text.starts_with("title,year,director,rating,comment,watched_at,external_metadata_id\n")
@@ -75,10 +94,8 @@ async fn csv_has_header_and_one_row() {
 async fn csv_escapes_commas_in_title() {
     let adapter = ExportAdapter;
     let entry = make_entry("Tár, A Film", 2022, None, 4, None);
-    let bytes = adapter
-        .serialize_entries(&[entry], ExportFormat::Csv)
-        .await
-        .unwrap();
+    let bytes =
+        collect_stream(adapter.stream_entries(entry_stream(vec![entry]), ExportFormat::Csv)).await;
     let text = String::from_utf8(bytes).unwrap();
     assert!(text.contains("\"Tár, A Film\""));
 }
@@ -87,10 +104,8 @@ async fn csv_escapes_commas_in_title() {
 async fn json_is_valid_array() {
     let adapter = ExportAdapter;
     let entry = make_entry("Dune", 2021, Some("Denis Villeneuve"), 5, None);
-    let bytes = adapter
-        .serialize_entries(&[entry], ExportFormat::Json)
-        .await
-        .unwrap();
+    let bytes =
+        collect_stream(adapter.stream_entries(entry_stream(vec![entry]), ExportFormat::Json)).await;
     let arr: Vec<serde_json::Value> = serde_json::from_slice(&bytes).unwrap();
     assert_eq!(arr.len(), 1);
     assert_eq!(arr[0]["title"], "Dune");
@@ -104,27 +119,23 @@ async fn json_is_valid_array() {
 async fn external_metadata_id_included_when_present() {
     let adapter = ExportAdapter;
     let entry = make_entry_full("Alien", 1979, None, 5, None, Some("tt0078748"));
-    let bytes = adapter
-        .serialize_entries(&[entry], ExportFormat::Json)
-        .await
-        .unwrap();
+    let bytes =
+        collect_stream(adapter.stream_entries(entry_stream(vec![entry]), ExportFormat::Json)).await;
     let arr: Vec<serde_json::Value> = serde_json::from_slice(&bytes).unwrap();
     assert_eq!(arr[0]["external_metadata_id"], "tt0078748");
 
-    let bytes = adapter
-        .serialize_entries(
-            &[make_entry_full(
-                "Alien",
-                1979,
-                None,
-                5,
-                None,
-                Some("tt0078748"),
-            )],
-            ExportFormat::Csv,
-        )
-        .await
-        .unwrap();
+    let bytes = collect_stream(adapter.stream_entries(
+        entry_stream(vec![make_entry_full(
+            "Alien",
+            1979,
+            None,
+            5,
+            None,
+            Some("tt0078748"),
+        )]),
+        ExportFormat::Csv,
+    ))
+    .await;
     let text = String::from_utf8(bytes).unwrap();
     assert!(text.contains("tt0078748"));
 }
@@ -132,13 +143,20 @@ async fn external_metadata_id_included_when_present() {
 #[tokio::test]
 async fn empty_entries_returns_csv_header_only() {
     let adapter = ExportAdapter;
-    let bytes = adapter
-        .serialize_entries(&[], ExportFormat::Csv)
-        .await
-        .unwrap();
+    let bytes =
+        collect_stream(adapter.stream_entries(entry_stream(vec![]), ExportFormat::Csv)).await;
     let text = String::from_utf8(bytes).unwrap();
     assert_eq!(
         text,
         "title,year,director,rating,comment,watched_at,external_metadata_id\n"
     );
 }
+
+#[tokio::test]
+async fn empty_json_is_valid_empty_array() {
+    let adapter = ExportAdapter;
+    let bytes =
+        collect_stream(adapter.stream_entries(entry_stream(vec![]), ExportFormat::Json)).await;
+    let arr: Vec<serde_json::Value> = serde_json::from_slice(&bytes).unwrap();
+    assert!(arr.is_empty());
+}

crates/adapters/postgres/Cargo.toml

@@ -20,3 +20,6 @@ async-trait = { workspace = true }
 tokio       = { workspace = true }
 serde       = { workspace = true, features = ["derive"] }
 serde_json  = { workspace = true }
+futures = { workspace = true }
+bytes = { workspace = true }
+async-stream = { workspace = true }

crates/adapters/postgres/src/diary.rs

@@ -8,6 +8,7 @@ use domain::{
     ports::DiaryRepository,
     value_objects::{MovieId, UserId},
 };
+use futures::stream::BoxStream;
 use sqlx::PgPool;
 
 use crate::models::{DiaryRow, FeedRow, MovieRow, MovieStatsRow, ReviewRow};
@@ -427,6 +428,35 @@ impl DiaryRepository for PostgresDiaryRepository {
         rows.into_iter().map(DiaryRow::into_domain).collect()
     }
 
+    fn stream_user_history(
+        &self,
+        user_id: UserId,
+    ) -> BoxStream<'static, Result<DiaryEntry, DomainError>> {
+        let pool = self.pool.clone();
+        let uid = user_id.value().to_string();
+        Box::pin(async_stream::stream! {
+            let mut rows = sqlx::query_as::<_, DiaryRow>(
+                "SELECT m.id, m.external_metadata_id, m.title, m.release_year, m.director, m.poster_path,
+                        r.id AS review_id, r.movie_id, r.user_id, r.rating, r.comment,
+                        to_char(r.watched_at AT TIME ZONE 'UTC', 'YYYY-MM-DD HH24:MI:SS') AS watched_at,
+                        to_char(r.created_at AT TIME ZONE 'UTC', 'YYYY-MM-DD HH24:MI:SS') AS created_at,
+                        r.remote_actor_url
+                 FROM reviews r
+                 INNER JOIN movies m ON m.id = r.movie_id
+                 WHERE r.user_id = $1
+                 ORDER BY r.watched_at DESC",
+            )
+            .bind(&uid)
+            .fetch(&pool);
+            while let Some(row) = futures::StreamExt::next(&mut rows).await {
+                yield match row {
+                    Ok(r) => r.into_domain(),
+                    Err(e) => Err(Self::map_err(e)),
+                };
+            }
+        })
+    }
+
     async fn get_movie_stats(&self, movie_id: &MovieId) -> Result<MovieStats, DomainError> {
         let id_str = movie_id.value().to_string();
         sqlx::query_as::<_, MovieStatsRow>(

crates/adapters/sqlite/Cargo.toml

@@ -20,3 +20,6 @@ chrono = { workspace = true }
 tracing = { workspace = true }
 async-trait = { workspace = true }
 tokio = { workspace = true }
+futures = { workspace = true }
+bytes = { workspace = true }
+async-stream = { workspace = true }

crates/adapters/sqlite/src/diary.rs

@@ -8,6 +8,7 @@ use domain::{
     ports::DiaryRepository,
     value_objects::{MovieId, UserId},
 };
+use futures::stream::BoxStream;
 use sqlx::SqlitePool;
 
 use crate::models::{DiaryRow, FeedRow, MovieRow, MovieStatsRow, ReviewRow};
@@ -389,6 +390,32 @@ impl DiaryRepository for SqliteDiaryRepository {
         rows.into_iter().map(DiaryRow::into_domain).collect()
     }
 
+    fn stream_user_history(
+        &self,
+        user_id: UserId,
+    ) -> BoxStream<'static, Result<DiaryEntry, DomainError>> {
+        let pool = self.pool.clone();
+        let uid = user_id.value().to_string();
+        Box::pin(async_stream::stream! {
+            let mut rows = sqlx::query_as::<_, DiaryRow>(
+                "SELECT m.id, m.external_metadata_id, m.title, m.release_year, m.director, m.poster_path,
+                        r.id AS review_id, r.movie_id, r.user_id, r.rating, r.comment, r.watched_at, r.created_at, r.remote_actor_url
+                 FROM reviews r
+                 INNER JOIN movies m ON m.id = r.movie_id
+                 WHERE r.user_id = ?
+                 ORDER BY r.watched_at DESC",
+            )
+            .bind(&uid)
+            .fetch(&pool);
+            while let Some(row) = futures::StreamExt::next(&mut rows).await {
+                yield match row {
+                    Ok(r) => r.into_domain(),
+                    Err(e) => Err(Self::map_err(e)),
+                };
+            }
+        })
+    }
+
     async fn get_movie_stats(&self, movie_id: &MovieId) -> Result<MovieStats, DomainError> {
         let id_str = movie_id.value().to_string();
         sqlx::query_as::<_, MovieStatsRow>(

crates/application/Cargo.toml

@@ -15,6 +15,7 @@ sha2 = { workspace = true }
 rand = { workspace = true }
 hex = { workspace = true }
 serde_json = { workspace = true }
+bytes = { workspace = true }
 
 [features]
 xlsx = []

crates/application/src/diary/export_diary.rs

@@ -1,22 +1,21 @@
 use std::sync::Arc;
 
+use bytes::Bytes;
 use domain::{
     errors::DomainError,
     ports::{DiaryExporter, DiaryRepository},
     value_objects::UserId,
 };
+use futures::stream::BoxStream;
 
 use crate::diary::queries::ExportQuery;
 
-pub async fn execute(
+pub fn execute(
     diary: &Arc<dyn DiaryRepository>,
     diary_exporter: &Arc<dyn DiaryExporter>,
     query: ExportQuery,
-) -> Result<Vec<u8>, DomainError> {
-    let entries = diary
-        .get_user_history(&UserId::from_uuid(query.user_id))
-        .await?;
-    diary_exporter
-        .serialize_entries(&entries, query.format)
-        .await
+) -> BoxStream<'static, Result<Bytes, DomainError>> {
+    let user_id = UserId::from_uuid(query.user_id);
+    let entry_stream = diary.stream_user_history(user_id);
+    diary_exporter.stream_entries(entry_stream, query.format)
 }

crates/domain/src/ports.rs

@@ -144,6 +144,10 @@ pub trait DiaryRepository: Send + Sync {
     ) -> Result<Paginated<FeedEntry>, DomainError>;
     async fn get_review_history(&self, movie_id: &MovieId) -> Result<ReviewHistory, DomainError>;
     async fn get_user_history(&self, user_id: &UserId) -> Result<Vec<DiaryEntry>, DomainError>;
+    fn stream_user_history(
+        &self,
+        user_id: UserId,
+    ) -> futures::stream::BoxStream<'static, Result<DiaryEntry, DomainError>>;
     async fn get_movie_stats(&self, movie_id: &MovieId) -> Result<MovieStats, DomainError>;
     async fn get_movie_social_feed(
         &self,
@@ -253,13 +257,12 @@ pub trait PasswordHasher: Send + Sync {
     async fn verify(&self, plain_password: &str, hash: &PasswordHash) -> Result<bool, DomainError>;
 }
 
-#[async_trait]
 pub trait DiaryExporter: Send + Sync {
-    async fn serialize_entries(
+    fn stream_entries(
         &self,
-        entries: &[DiaryEntry],
+        stream: futures::stream::BoxStream<'static, Result<DiaryEntry, DomainError>>,
         format: ExportFormat,
-    ) -> Result<Vec<u8>, DomainError>;
+    ) -> futures::stream::BoxStream<'static, Result<bytes::Bytes, DomainError>>;
 }
 
 #[async_trait]

crates/domain/src/testing/fakes.rs

@@ -154,6 +154,13 @@ impl DiaryRepository for FakeDiaryRepository {
         Ok(vec![])
     }
 
+    fn stream_user_history(
+        &self,
+        _user_id: UserId,
+    ) -> futures::stream::BoxStream<'static, Result<DiaryEntry, DomainError>> {
+        Box::pin(futures::stream::empty())
+    }
+
     async fn get_movie_stats(&self, _movie_id: &MovieId) -> Result<MovieStats, DomainError> {
         Ok(MovieStats {
             total_count: 0,

crates/domain/src/testing/panics.rs

@@ -49,6 +49,12 @@ impl DiaryRepository for PanicDiaryRepository {
     async fn get_user_history(&self, _: &UserId) -> Result<Vec<DiaryEntry>, DomainError> {
         panic!("PanicDiaryRepository called")
     }
+    fn stream_user_history(
+        &self,
+        _: UserId,
+    ) -> futures::stream::BoxStream<'static, Result<DiaryEntry, DomainError>> {
+        panic!("PanicDiaryRepository called")
+    }
     async fn get_movie_stats(&self, _: &MovieId) -> Result<MovieStats, DomainError> {
         panic!("PanicDiaryRepository called")
     }
@@ -250,13 +256,12 @@ impl PosterFetcherClient for PanicPosterFetcher {
 
 pub struct PanicDiaryExporter;
 
-#[async_trait]
 impl DiaryExporter for PanicDiaryExporter {
-    async fn serialize_entries(
+    fn stream_entries(
         &self,
-        _: &[DiaryEntry],
-        _: ExportFormat,
-    ) -> Result<Vec<u8>, DomainError> {
+        _stream: futures::stream::BoxStream<'static, Result<DiaryEntry, DomainError>>,
+        _format: ExportFormat,
+    ) -> futures::stream::BoxStream<'static, Result<bytes::Bytes, DomainError>> {
         panic!("PanicDiaryExporter called")
     }
 }

crates/presentation/Cargo.toml

@@ -42,6 +42,7 @@ dotenvy = { workspace = true }
 uuid = { workspace = true }
 chrono = { workspace = true }
 async-trait = { workspace = true }
+futures = { workspace = true }
 
 api-types = { workspace = true }
 domain = { workspace = true, features = ["test-helpers"] }

crates/presentation/src/handlers/diary.rs

@@ -1,9 +1,11 @@
 use axum::{
     Form, Json,
+    body::Body,
     extract::{Extension, Path, Query, State},
     http::StatusCode,
     response::{IntoResponse, Redirect},
 };
+use futures::StreamExt;
 use uuid::Uuid;
 
 use application::diary::{
@@ -147,30 +149,29 @@ pub async fn export_diary(
         user_id: user.0.value(),
         format,
     };
-    match export_diary_uc::execute(
+    let stream = export_diary_uc::execute(
         &state.app_ctx.repos.diary,
         &state.app_ctx.services.diary_exporter,
         query,
-    )
-    .await
-    {
-        Ok(bytes) => (
-            StatusCode::OK,
-            [
-                (axum::http::header::CONTENT_TYPE, content_type.to_string()),
-                (
-                    axum::http::header::CONTENT_DISPOSITION,
-                    format!("attachment; filename=\"{}\"", filename),
-                ),
-            ],
-            bytes,
-        )
-            .into_response(),
-        Err(e) => {
-            tracing::error!("export error: {:?}", e);
-            StatusCode::INTERNAL_SERVER_ERROR.into_response()
+    );
+    let stream = stream.map(|r| {
+        if let Err(ref e) = r {
+            tracing::error!("diary export stream error: {e}");
         }
-    }
+        r
+    });
+    (
+        StatusCode::OK,
+        [
+            (axum::http::header::CONTENT_TYPE, content_type.to_string()),
+            (
+                axum::http::header::CONTENT_DISPOSITION,
+                format!("attachment; filename=\"{}\"", filename),
+            ),
+        ],
+        Body::from_stream(stream),
+    )
+        .into_response()
 }
 
 #[utoipa::path(
@@ -314,27 +315,29 @@ pub async fn get_export_html(
         user_id: user_id.value(),
         format,
     };
-    match export_diary_uc::execute(
+    let stream = export_diary_uc::execute(
         &state.app_ctx.repos.diary,
         &state.app_ctx.services.diary_exporter,
         query,
+    );
+    let stream = stream.map(|r| {
+        if let Err(ref e) = r {
+            tracing::error!("diary export stream error: {e}");
+        }
+        r
+    });
+    (
+        StatusCode::OK,
+        [
+            (axum::http::header::CONTENT_TYPE, content_type.to_string()),
+            (
+                axum::http::header::CONTENT_DISPOSITION,
+                format!("attachment; filename=\"{}\"", filename),
+            ),
+        ],
+        Body::from_stream(stream),
     )
-    .await
-    {
-        Ok(bytes) => (
-            StatusCode::OK,
-            [
-                (axum::http::header::CONTENT_TYPE, content_type.to_string()),
-                (
-                    axum::http::header::CONTENT_DISPOSITION,
-                    format!("attachment; filename=\"{}\"", filename),
-                ),
-            ],
-            bytes,
-        )
-            .into_response(),
-        Err(e) => crate::errors::domain_error_response(e),
-    }
+        .into_response()
 }
 
 pub async fn get_activity_feed_html(

crates/presentation/src/tests/extractors.rs

@@ -120,6 +120,12 @@ impl DiaryRepository for Panic {
     async fn get_user_history(&self, _: &UserId) -> Result<Vec<DiaryEntry>, DomainError> {
         panic!()
     }
+    fn stream_user_history(
+        &self,
+        _: UserId,
+    ) -> futures::stream::BoxStream<'static, Result<DiaryEntry, DomainError>> {
+        panic!()
+    }
     async fn get_movie_stats(
         &self,
         _: &MovieId,
@@ -379,14 +385,17 @@ impl domain::ports::MovieProfileRepository for Panic {
         Ok(vec![])
     }
 }
-#[async_trait::async_trait]
 impl domain::ports::DiaryExporter for Panic {
-    async fn serialize_entries(
+    fn stream_entries(
         &self,
-        _: &[domain::models::DiaryEntry],
-        _: domain::models::ExportFormat,
-    ) -> Result<Vec<u8>, domain::errors::DomainError> {
-        panic!()
+        _stream: futures::stream::BoxStream<
+            'static,
+            Result<domain::models::DiaryEntry, domain::errors::DomainError>,
+        >,
+        _format: domain::models::ExportFormat,
+    ) -> futures::stream::BoxStream<'static, Result<bytes::Bytes, domain::errors::DomainError>>
+    {
+        panic!("Panic DiaryExporter called")
     }
 }
 

crates/presentation/tests/api_test.rs

@@ -165,14 +165,16 @@ impl domain::ports::UserProfileFieldsRepository for PanicProfileFields {
 }
 
 struct PanicExporter;
-#[async_trait]
 impl domain::ports::DiaryExporter for PanicExporter {
-    async fn serialize_entries(
+    fn stream_entries(
         &self,
-        _: &[domain::models::DiaryEntry],
-        _: domain::models::ExportFormat,
-    ) -> Result<Vec<u8>, DomainError> {
-        panic!()
+        _stream: futures::stream::BoxStream<
+            'static,
+            Result<domain::models::DiaryEntry, DomainError>,
+        >,
+        _format: domain::models::ExportFormat,
+    ) -> futures::stream::BoxStream<'static, Result<bytes::Bytes, DomainError>> {
+        panic!("PanicExporter::stream_entries")
     }
 }