Rust backend setup

backend/src/airports/model.rs

@@ -7,19 +7,19 @@ use serde::{Deserialize, Serialize};
 #[derive(Serialize, Deserialize, AsChangeset, Insertable)]
 #[table_name = "airports"]
 pub struct Airport {
-  pub name: String,
+  pub full_name: String,
   pub icao: String,
-  pub latitude: f32,
-  pub longitude: f32,
+  pub latitude: f64,
+  pub longitude: f64,
 }
 
 #[derive(Serialize, Deserialize, Queryable)]
 pub struct Airports {
   pub id: i32,
-  pub name: String,
+  pub full_name: String,
   pub icao: String,
-  pub latitude: f32,
-  pub longitude: f32,
+  pub latitude: f64,
+  pub longitude: f64,
 }
 
 impl Airports {
@@ -28,4 +28,34 @@ impl Airports {
     let airports = airports::table.load::<Airports>(&conn)?;
     Ok(airports)
   }
+
+  pub fn find(id: i32) -> Result<Self, CustomError> {
+    let conn = db::connection()?;
+    let airport = airports::table.filter(airports::id.eq(id)).first(&conn)?;
+    Ok(airport)
+}
+
+pub fn create(airport: Airport) -> Result<Self, CustomError> {
+    let conn = db::connection()?;
+    let airport = Airport::from(airport);
+    let airport = diesel::insert_into(airports::table)
+        .values(airport)
+        .get_result(&conn)?;
+    Ok(airport)
+}
+
+pub fn update(id: i32, airport: Airport) -> Result<Self, CustomError> {
+    let conn = db::connection()?;
+    let airport = diesel::update(airports::table)
+        .filter(airports::id.eq(id))
+        .set(airport)
+        .get_result(&conn)?;
+    Ok(airport)
+}
+
+pub fn delete(id: i32) -> Result<usize, CustomError> {
+    let conn = db::connection()?;
+    let res = diesel::delete(airports::table.filter(airports::id.eq(id))).execute(&conn)?;
+    Ok(res)
+}
 }

backend/src/airports/routes.rs

@@ -9,6 +9,37 @@ async fn find_all() -> Result<HttpResponse, CustomError> {
     Ok(HttpResponse::Ok().json(airports))
 }
 
+#[get("/airports/{id}")]
+async fn find(id: web::Path<i32>) -> Result<HttpResponse, CustomError> {
+    let airport = Airports::find(id.into_inner())?;
+    Ok(HttpResponse::Ok().json(airport))
+}
+
+#[post("/airports")]
+async fn create(airport: web::Json<Airport>) -> Result<HttpResponse, CustomError> {
+    let airport = Airports::create(airport.into_inner())?;
+    Ok(HttpResponse::Ok().json(airport))
+}
+
+#[put("/airports/{id}")]
+async fn update(
+    id: web::Path<i32>,
+    airport: web::Json<Airport>,
+) -> Result<HttpResponse, CustomError> {
+    let airport = Airports::update(id.into_inner(), airport.into_inner())?;
+    Ok(HttpResponse::Ok().json(airport))
+}
+
+#[delete("/airports/{id}")]
+async fn delete(id: web::Path<i32>) -> Result<HttpResponse, CustomError> {
+    let deleted_airport = Airports::delete(id.into_inner())?;
+    Ok(HttpResponse::Ok().json(json!({ "deleted": deleted_airport })))
+}
+
 pub fn init_routes(config: &mut web::ServiceConfig) {
   config.service(find_all);
+  config.service(find);
+  config.service(create);
+  config.service(update);
+  config.service(delete);
 }

backend/src/db.rs

@@ -2,13 +2,14 @@ use crate::error_handler::CustomError;
 use diesel::pg::PgConnection;
 use diesel::r2d2::ConnectionManager;
 use lazy_static::lazy_static;
+use log::{error, info};
 use r2d2;
 use std::env;
 
 type Pool = r2d2::Pool<ConnectionManager<PgConnection>>;
 pub type DbConnection = r2d2::PooledConnection<ConnectionManager<PgConnection>>;
 
-embed_migrations!();
+diesel_migrations::embed_migrations!();
 
 lazy_static! {
     static ref POOL: Pool = {
@@ -21,7 +22,10 @@ lazy_static! {
 pub fn init() {
     lazy_static::initialize(&POOL);
     let conn = connection().expect("Failed to get db connection");
-    embedded_migrations::run(&conn).unwrap();
+    match embedded_migrations::run(&conn) {
+        Ok(_) => info!("Database initialized"),
+        Err(err) => error!("Failed to initialize database; {}", err),
+    };
 }
 
 pub fn connection() -> Result<DbConnection, CustomError> {

backend/src/error_handler.rs

@@ -1,11 +1,11 @@
 use actix_web::http::StatusCode;
 use actix_web::{HttpResponse, ResponseError};
 use diesel::result::Error as DieselError;
-use serde::Deserialize;
+use serde::{Deserialize, Serialize};
 use serde_json::json;
 use std::fmt;
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Deserialize, Serialize)]
 pub struct CustomError {
     pub error_status_code: u16,
     pub error_message: String,
@@ -31,7 +31,7 @@ impl From<DieselError> for CustomError {
         match error {
             DieselError::DatabaseError(_, err) => CustomError::new(409, err.message().to_string()),
             DieselError::NotFound => {
-                CustomError::new(404, "The employee record not found".to_string())
+                CustomError::new(404, "The airport record was not found".to_string())
             }
             err => CustomError::new(500, format!("Unknown Diesel error: {}", err)),
         }

backend/src/main.rs

@@ -11,15 +11,20 @@ use std::env;
 mod airports;
 mod db;
 mod error_handler;
+mod metars;
 mod schema;
 
 #[actix_rt::main]
 async fn main() -> std::io::Result<()> {
     dotenv().ok();
+    env_logger::init();
     db::init();
 
     let mut listenfd = ListenFd::from_env();
-    let mut server = HttpServer::new(|| App::new().configure(airports::init_routes));
+    let mut server = HttpServer::new(|| App::new()
+        .configure(airports::init_routes)
+        .configure(metars::init_routes)
+    );
 
     server = match listenfd.take_tcp_listener(0)? {
         Some(listener) => server.listen(listener)?,

backend/src/metars/mod.rs

@@ -0,0 +1,5 @@
+mod model;
+mod routes;
+
+pub use model::*;
+pub use routes::init_routes;

backend/src/metars/model.rs

@@ -0,0 +1,162 @@
+use crate::error_handler::CustomError;
+use crate::schema::metars;
+use log::warn;
+use std::io::BufRead;
+use quick_xml::{Reader, events::{Event, BytesStart}, Writer, de::Deserializer};
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize)]
+pub struct QualityControlFlags {
+    pub auto: Option<bool>,
+    pub auto_station: Option<bool>
+}
+
+#[derive(Serialize, Deserialize, AsChangeset, Insertable)]
+#[table_name = "metars"]
+pub struct Metar {
+    pub icao: String,
+    pub raw_text: String,
+    pub station_id: String,
+    pub observation_time: String,
+    pub latitude: f64,
+    pub longitude: f64,
+    pub temp_c: f64,
+    pub dewpoint_c: f64,
+    pub wind_dir_degrees: i32,
+    pub wind_speed_kt: i32,
+    pub visibility_statute_mi: String,
+    pub altim_in_hg: f64,
+    pub sea_level_pressure_mb: Option<f64>,
+    // pub quality_control_flags: Option<QualityControlFlags>,
+    pub wx_string: Option<String>,
+    // pub sky_con dition: Option<Vec<String>>, // TODO work on attributes
+    pub flight_category: String,
+    pub three_hr_pressure_tendency_mb: Option<f64>,
+    pub metar_type: String,
+    #[serde(rename = "maxT_c")]
+    pub max_t_c: Option<f64>,
+    #[serde(rename = "minT_c")]
+    pub min_t_c: Option<f64>,
+    pub precip_in: Option<f64>,
+    pub elevation_m: i32
+}
+
+#[derive(Serialize, Deserialize, Queryable)]
+pub struct Metars {
+    // pub id: i32,
+    // pub icao: String,
+    pub raw_text: String,
+    pub station_id: String,
+    pub observation_time: String,
+    pub latitude: f64,
+    pub longitude: f64,
+    pub temp_c: f64,
+    pub dewpoint_c: f64,
+    pub wind_dir_degrees: i32,
+    pub wind_speed_kt: i32,
+    pub visibility_statute_mi: String,
+    pub altim_in_hg: f64,
+    pub sea_level_pressure_mb: Option<f64>,
+    pub quality_control_flags: Option<QualityControlFlags>,
+    pub wx_string: Option<String>,
+    // pub sky_condition: Option<Vec<String>>, // TODO work on attributes
+    pub flight_category: String,
+    pub three_hr_pressure_tendency_mb: Option<f64>,
+    pub metar_type: String,
+    #[serde(rename = "maxT_c")]
+    pub max_t_c: Option<f64>,
+    #[serde(rename = "minT_c")]
+    pub min_t_c: Option<f64>,
+    pub precip_in: Option<f64>,
+    pub elevation_m: i32
+}
+
+impl Metars {
+    pub async fn get_all(icaos: String) -> Result<Vec<Self>, CustomError> {
+        // let station_string = station_icaos.join(",");
+        let url = format!("https://beta.aviationweather.gov/cgi-bin/data/metar.php?ids={}&format=xml", icaos);
+        let metars: Vec<Metars> = match reqwest::get(url).await {
+            Ok(r) => match r.text().await {
+                Ok(r) => {
+                    match Metars::parse(r) {
+                        Ok(m) => m,
+                        Err(err) => {
+                            warn!("{}", err);
+                            vec![]
+                        }
+                    }
+                },
+                Err(err) => {
+                    warn!("Unable to parse METAR request: {}", err);
+                    vec![]
+                }
+            },
+            Err(err) => {
+                warn!("Unable to get METAR request: {}", err);
+                vec![]
+            }
+        };
+        Ok(metars)
+    }
+
+    pub fn parse(input: String) -> Result<Vec<Self>, CustomError> {
+        if input.is_empty() {
+            return Err(CustomError::new(500, "Input is empty".to_string()))
+        }
+
+        let mut reader = Reader::from_str(&input);
+        let mut buf = Vec::new();
+        let mut junk_buf: Vec<u8> = Vec::new();
+        let mut metars: Vec<Self> = vec![];
+
+        loop {
+            match reader.read_event_into(&mut buf) {
+                Err(e) => panic!("Error at position: {}: {:?}", reader.buffer_position(), e),
+                Ok(Event::Eof) => break,
+                Ok(Event::Start(e)) => {
+                    match e.name().as_ref() {
+                        b"METAR" => {
+                            let metar_bytes = Metars::read_to_end_into_buffer(&mut reader, &e, &mut junk_buf).unwrap();
+                            let str = std::str::from_utf8(&metar_bytes).unwrap();
+                            let mut deserializer = Deserializer::from_str(str);
+                            let metar = Metars::deserialize(&mut deserializer).unwrap();
+                            metars.push(metar);
+                        },
+                        _ => ()
+                    }
+                },
+                _ => ()
+            }
+        }
+
+        return Ok(metars)
+    }
+
+    // https://capnfabs.net/posts/parsing-huge-xml-quickxml-rust-serde/
+    pub fn read_to_end_into_buffer<R: BufRead>(reader: &mut Reader<R>, start_tag: &BytesStart, junk_buf: &mut Vec<u8>) -> Result<Vec<u8>, quick_xml::Error> {
+        let mut depth = 0;
+        let mut output_buf: Vec<u8> = Vec::new();
+        let mut w = Writer::new(&mut output_buf);
+        let tag_name = start_tag.name();
+        w.write_event(Event::Start(start_tag.clone()))?;
+        loop {
+            junk_buf.clear();
+            let event = reader.read_event_into(junk_buf)?;
+            w.write_event(&event)?;
+      
+            match event {
+                Event::Start(e) if e.name() == tag_name => depth += 1,
+                Event::End(e) if e.name() == tag_name => {
+                    if depth == 0 {
+                        return Ok(output_buf);
+                    }
+                    depth -= 1;
+                }
+                Event::Eof => {
+                    panic!("EOF")
+                }
+                _ => {}
+            }
+        }
+    }
+}

backend/src/metars/routes.rs

@@ -0,0 +1,18 @@
+use crate::error_handler::CustomError;
+use crate::metars::Metars;
+use actix_web::{get, web, HttpResponse};
+
+#[get("metars/{ids}")]
+async fn get_all(ids: web::Path<String>) -> Result<HttpResponse, CustomError> {
+    let airports = web::block(|| Ok::<_, CustomError>(async {Metars::get_all(ids.into_inner()).await}))
+        .await
+        .unwrap()
+        .unwrap()
+        .await
+        .unwrap();
+    Ok(HttpResponse::Ok().json(airports))
+}
+
+pub fn init_routes(config: &mut web::ServiceConfig) {
+    config.service(get_all);
+}

backend/src/schema.rs

@@ -1,9 +1,36 @@
-table! {
+diesel::table! {
   airports (id) {
-    id -> Int4,
-    name -> Varchar,
-    icao -> Varchar,
-    latitude: Int4,
-    longitude: Int4
+    id -> Integer,
+    full_name -> Text,
+    icao -> Text,
+    latitude -> Double,
+    longitude -> Double,
   }
-}
+}
+
+diesel::table! {
+  metars (id) {
+    id -> Integer,
+    icao -> Text,
+    raw_text -> Text,
+    station_id -> Text,
+    observation_time -> Text,
+    latitude -> Double,
+    longitude -> Double,
+    temp_c -> Double,
+    dewpoint_c -> Double,
+    wind_dir_degrees -> Integer,
+    wind_speed_kt -> Integer,
+    visibility_statute_mi -> Text,
+    altim_in_hg -> Double,
+    sea_level_pressure_mb -> Nullable<Double>,
+    wx_string -> Nullable<Text>,
+    flight_category -> Text,
+    three_hr_pressure_tendency_mb -> Nullable<Double>,
+    metar_type -> Text,
+    max_t_c -> Nullable<Double>,
+    min_t_c -> Nullable<Double>,
+    precip_in -> Nullable<Double>,
+    elevation_m -> Integer,
+  }
+}