Добавлена возможность создания ResponseError с описанием ошибки.

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

src/routes/schedule/get_schedule.rs

@@ -0,0 +1,38 @@
+use self::schema::*;
+use crate::app_state::AppState;
+use crate::routes::schedule::schema::{Error, ScheduleView};
+use crate::routes::schema::{IntoResponseAsError, ResponseError};
+use actix_web::{get, web};
+
+#[utoipa::path(responses(
+    (status = OK, body = ScheduleView),
+    (status = SERVICE_UNAVAILABLE, body = ResponseError<ErrorCode>)
+))]
+#[get("/")]
+pub async fn get_schedule(app_state: web::Data<AppState>) -> Response {
+    match ScheduleView::try_from(app_state.get_ref()) {
+        Ok(res) => Ok(res).into(),
+        Err(e) => match e {
+            Error::NoSchedule => ErrorCode::NoSchedule.into_response(),
+        },
+    }
+}
+
+mod schema {
+    use crate::routes::schedule::schema::ScheduleView;
+    use actix_macros::{IntoResponseErrorNamed, StatusCode};
+    use derive_more::Display;
+    use serde::Serialize;
+    use utoipa::ToSchema;
+
+    pub type Response = crate::routes::schema::Response<ScheduleView, ErrorCode>;
+
+    #[derive(Clone, Serialize, ToSchema, StatusCode, Display, IntoResponseErrorNamed)]
+    #[status_code = "actix_web::http::StatusCode::SERVICE_UNAVAILABLE"]
+    #[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+    #[schema(as = ScheduleView::ErrorCode)]
+    pub enum ErrorCode {
+        #[display("Schedule not parsed yet")]
+        NoSchedule,
+    }
+}

src/routes/schedule/mod.rs

@@ -0,0 +1,2 @@
+pub mod get_schedule;
+mod schema;

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)
+        }
+    }
+}