You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mark_read.rs
    path of file: ./repos/mCaptcha/src/api/v1/notifications
    
    the code of the file until where you have to start completion: // Copyright (C) 2022  Aravinth Manivannan <realaravinth@batsense.net>
// SPDX-FileCopyrightText: 2023 Aravinth Manivannan <realaravinth@batsense.net>
//
// SPDX-License-Identifier: AGPL-3.0-or-later

use actix_identity::Identity;
use actix_web::{web, HttpResponse, Responder};
use serde::{Deserialize, Serialize};

use crate::errors::*;
use crate::AppData;

#[derive(Deserialize, Serialize)]
pub struct MarkReadReq {
    pub id: i32,
}

/// route handler that marks a notification read
#[my_codegen::post(
    path = "crate::V1_API_ROUTES.notifications.mark_read",
    wrap = "crate::api::v1::get_middleware()"
)]
pub async fn mark_read(
    data: AppData,
    payload: web::Json<MarkReadReq>,
    id: Identity,
) -> ServiceResult<impl Responder> {
    let receiver = id.identity().unwrap();
    // TODO handle error where payload.to doesn't exist

    // TODO get payload from path /api/v1/notifications/{id}/read"
    data.db
        .mark_notification_read(&receiver, payload.id)
        .await?;

    Ok(HttpResponse::Ok())
}

#[cfg(test)]
pub mod tests {
    use actix_web::http::StatusCode;
    use actix_web::test;

    use super::*;
    use crate::api::v1::notifications::add::AddNotificationRequest;
    use crate::api::v1::notifications::get::NotificationResp;
    use crate::tests::*;
    use crate::*;

    #[actix_rt::test]
    async fn notification_mark_read_works_pg() {
        let data = pg::get_data().await;
        notification_mark_read_works(data).await;
    }

    #[actix_rt::test]
    async fn notification_mark_read_works_maria() {
        let data = maria::get_data().await;
        notification_mark_read_works(data).await;
    }

    pub async fn notification_mark_read_works(data: ArcData) {
        const NAME1: &str = "notifuser122";
        const NAME2: &str = "notiuser222";
        const PASSWORD: &str = "longpassworddomain";
        const EMAIL1: &str = "testnotification122@a.com";
        const EMAIL2: &str = "testnotification222@a.com";
        const HEADING: &str = "testing notifications get";
        const MESSAGE: &str = "testing notifications get message";
        let data = &data;

        delete_user(data, NAME1).await;
        delete_user(data, NAME2).await;

        register_and_signin(data, NAME1, EMAIL1, PASSWORD).await;
        register_and_signin(data, NAME2, EMAIL2, PASSWORD).await;
        let (_creds, signin_resp) = si
    
    pub async fn notification_mark_read_works(data: ArcData) {
        const NAME1: &str = "notifuser122";
        const NAME2: &str = "notiuser222";
        const PASSWORD: &str = "longpassworddomain";
        const EMAIL1: &str = "testnotification122@a.com";
        const EMAIL2: &str = "testnotification222@a.com";
        const HEADING: &str = "testing notifications get";
        const MESSAGE: &str = "testing notifications get message";
        let data = &data;

        delete_user(data, NAME1).await;
        delete_user(data, NAME2).await;

        register_and_signin(data, NAME1, EMAIL1, PASSWORD).await;
        register_and_signin(data, NAME2, EMAIL2, PASSWORD).await;
        let (_creds, signin_resp) = signin(data, NAME1, PASSWORD).await;
        let (_creds2, signin_resp2) = signin(data, NAME2, PASSWORD).await;
        let cookies = get_cookie!(signin_resp);
        let cookies2 = get_cookie!(signin_resp2);
        let app = get_app!(data).await;

        let msg = AddNotificationRequest {
            to: NAME2.into(),
            heading: HEADING.into(),
            message: MESSAGE.into(),
        };

        let send_notification_resp = test::call_service(
            &app,
            post_request!(&msg, V1_API_ROUTES.notifications.add)
                .cookie(cookies.clone())
                .to_request(),
        )
        .await;
        assert_eq!(send_notification_resp.status(), StatusCode::OK);

        let get_notifications_resp = test::call_service(
            &app,
            test::TestRequest::get()
                .uri(V1_API_ROUTES.notifications.get)
                .cookie(cookies2.clone())
                .to_request(),
        )
        .await;
        assert_eq!(get_notifications_resp.status(), StatusCode::OK);

        let mut notifications: Vec<NotificationResp> =
            test::read_body_json(get_notifications_resp).await;
        let notification = notifications.pop().unwrap();
        assert_eq!(notification.name, NAME1);
        assert_eq!(notification.message, MESSAGE);
        assert_eq!(notification.heading, HEADING);

        let mark_read_payload = MarkReadReq {
            id: notification.id,
        };
        let mark_read_resp = test::call_service(
            &app,
            post_request!(&mark_read_payload, V1_API_ROUTES.notifications.mark_read)
                .cookie(cookies2.clone())
                .to_request(),
        )
        .await;
        assert_eq!(mark_read_resp.status(), StatusCode::OK);

        let get_notifications_resp = test::call_service(
            &app,
            test::TestRequest::get()
                .uri(V1_API_ROUTES.notifications.get)
                .cookie(cookies2.clone())
                .to_request(),
        )
        .await;
        assert_eq!(get_notifications_resp.status(), StatusCode::OK);
        let mut notifications: Vec<NotificationResp> =
            test::read_body_json(get_notifications_resp).await;
        assert!(notifications.pop().is_none());
    }