Добавлена возможность создания ResponseError с описанием ошибки.

Добавлен макрос для трансформации ErrorCode в Response, а также для имплементации треита PartialStatusCode.

src/routes/schedule/schema.rs

@@ -0,0 +1,47 @@
+use crate::app_state::AppState;
+use crate::parser::schema::ScheduleEntry;
+use chrono::{DateTime, Utc};
+use serde::Serialize;
+use std::collections::HashMap;
+use utoipa::ToSchema;
+
+#[derive(Serialize, ToSchema)]
+pub struct ScheduleView {
+    etag: String,
+    replacer_id: Option<String>,
+    uploaded_at: DateTime<Utc>,
+    downloaded_at: DateTime<Utc>,
+    groups: HashMap<String, ScheduleEntry>,
+    teachers: HashMap<String, ScheduleEntry>,
+    updated_groups: Vec<Vec<i32>>,
+    updated_teachers: Vec<Vec<i32>>,
+}
+
+pub enum Error {
+    NoSchedule,
+}
+
+impl TryFrom<&AppState> for ScheduleView {
+    type Error = Error;
+
+    fn try_from(app_state: &AppState) -> Result<Self, Self::Error> {
+        let schedule_lock = app_state.schedule.lock().unwrap();
+
+        if let Some(schedule_ref) = schedule_lock.as_ref() {
+            let schedule = schedule_ref.clone();
+
+            Ok(Self {
+                etag: schedule.etag,
+                replacer_id: None,
+                uploaded_at: schedule.updated_at,
+                downloaded_at: schedule.parsed_at,
+                groups: schedule.data.groups,
+                teachers: schedule.data.teachers,
+                updated_groups: vec![],
+                updated_teachers: vec![],
+            })
+        } else {
+            Err(Error::NoSchedule)
+        }
+    }
+}