[workspace]
members = [
    "auth-service",
    "planets-service",
    "satellites-service",
    "common-utils",
]

[package]
name = "planets-service"
version = "0.1.0"
edition = "2018"
[dependencies]
common-utils = { path = "../common-utils" }
async-graphql = "2.4.3"
async-graphql-actix-web = "2.4.3"
actix-web = "3.3.2"
actix-rt = "1.1.1"
actix-web-actors = "3.0.0"
futures = "0.3.8"
async-trait = "0.1.42"
bigdecimal = { version = "0.1.2", features = ["serde"] }
serde = { version = "1.0.118", features = ["derive"] }
serde_json = "1.0.60"
diesel = { version = "1.4.5", features = ["postgres", "r2d2", "numeric"] }
diesel_migrations = "1.4.0"
dotenv = "0.15.0"
strum = "0.20.0"
strum_macros = "0.20.1"
rdkafka = { version = "0.24.0", features = ["cmake-build"] }
async-stream = "0.3.0"
lazy_static = "1.4.0"
[dev-dependencies]
jsonpath_lib = "0.2.6"
testcontainers = "0.9.1"

#[actix_rt::main]
async fn main() -> std::io::Result<()> {
    dotenv().ok();
    let pool = create_connection_pool();
    run_migrations(&pool);
    let schema = create_schema_with_context(pool);
    HttpServer::new(move || App::new()
        .configure(configure_service)
        .data(schema.clone())
    )
        .bind("0.0.0.0:8001")?
        .run()
        .await
}

pub fn configure_service(cfg: &mut web::ServiceConfig) {
    cfg
        .service(web::resource("/")
            .route(web::post().to(index))
            .route(web::get().guard(guard::Header("upgrade", "websocket")).to(index_ws))
            .route(web::get().to(index_playground))
        );
}
async fn index(schema: web::Data, http_req: HttpRequest, req: Request) -> Response {
    let mut query = req.into_inner();
    let maybe_role = common_utils::get_role(http_req);
    if let Some(role) = maybe_role {
        query = query.data(role);
    }
    schema.execute(query).await.into()
}
async fn index_ws(schema: web::Data, req: HttpRequest, payload: web::Payload) -> Result {
    WSSubscription::start(Schema::clone(&*schema), &req, payload)
}
async fn index_playground() -> HttpResponse {
    HttpResponse::Ok()
        .content_type("text/html; charset=utf-8")
        .body(playground_source(GraphQLPlaygroundConfig::new("/").subscription_endpoint("/")))
}
pub fn create_schema_with_context(pool: PgPool) -> Schema {
    let arc_pool = Arc::new(pool);
    let cloned_pool = Arc::clone(&arc_pool);
    let details_batch_loader = Loader::new(DetailsBatchLoader {
        pool: cloned_pool
    }).with_max_batch_size(10);
    let kafka_consumer_counter = Mutex::new(0);
    Schema::build(Query, Mutation, Subscription)
        .data(arc_pool)
        .data(details_batch_loader)
        .data(kafka::create_producer())
        .data(kafka_consumer_counter)
        .finish()
}

#[Object]
impl Query {
    async fn get_planets(&self, ctx: &Context<'_>) -> Vec {
        repository::get_all(&get_conn_from_ctx(ctx)).expect("Can't get planets")
            .iter()
            .map(|p| { Planet::from(p) })
            .collect()
    }
    async fn get_planet(&self, ctx: &Context<'_>, id: ID) -> Option {
        find_planet_by_id_internal(ctx, id)
    }
    #[graphql(entity)]
    async fn find_planet_by_id(&self, ctx: &Context<'_>, id: ID) -> Option {
        find_planet_by_id_internal(ctx, id)
    }
}
fn find_planet_by_id_internal(ctx: &Context<'_>, id: ID) -> Option {
    let id = id.to_string().parse::().expect("Can't get id from String");
    repository::get(id, &get_conn_from_ctx(ctx)).ok()
        .map(|p| { Planet::from(&p) })
}

{
  getPlanets {
    name
    type
  }
}

#[derive(Serialize, Deserialize)]
struct Planet {
    id: ID,
    name: String,
    planet_type: PlanetType,
}
#[Object]
impl Planet {
    async fn id(&self) -> &ID {
        &self.id
    }
    async fn name(&self) -> &String {
        &self.name
    }
    /// From an astronomical point of view
    #[graphql(name = "type")]
    async fn planet_type(&self) -> &PlanetType {
        &self.planet_type
    }
    #[graphql(deprecation = "Now it is not in doubt. Do not use this field")]
    async fn is_rotating_around_sun(&self) -> bool {
        true
    }
    async fn details(&self, ctx: &Context<'_>) -> Details {
        let loader = ctx.data::>().expect("Can't get loader");
        let planet_id = self.id.to_string().parse::().expect("Can't convert id");
        loader.load(planet_id).await
    }
}

{
  getPlanets {
    name
    details {
      meanRadius
    }
  }
}

async fn details(&self, ctx: &Context<'_>) -> Result {
    let data_loader = ctx.data::>().expect("Can't get data loader");
    let planet_id = self.id.to_string().parse::().expect("Can't convert id");
    let details = data_loader.load_one(planet_id).await?;
    details.ok_or_else(|| "Not found".into())
}

let details_data_loader = DataLoader::new(DetailsLoader {
    pool: cloned_pool
}).max_batch_size(10);

pub struct DetailsLoader {
    pub pool: Arc
}
#[async_trait::async_trait]
impl Loader for DetailsLoader {
    type Value = Details;
    type Error = Error;
    async fn load(&self, keys: &[i32]) -> Result, Self::Error> {
        let conn = self.pool.get().expect("Can't get DB connection");
        let details = repository::get_details(keys, &conn).expect("Can't get planets' details");
        Ok(details.iter()
            .map(|details_entity| (details_entity.planet_id, Details::from(details_entity)))
            .collect::>())
    }
}

#[derive(Interface, Clone)]
#[graphql(
    field(name = "mean_radius", type = "&CustomBigDecimal"),
    field(name = "mass", type = "&CustomBigInt"),
)]
pub enum Details {
    InhabitedPlanetDetails(InhabitedPlanetDetails),
    UninhabitedPlanetDetails(UninhabitedPlanetDetails),
}
#[derive(SimpleObject, Clone)]
pub struct InhabitedPlanetDetails {
    mean_radius: CustomBigDecimal,
    mass: CustomBigInt,
    /// In billions
    population: CustomBigDecimal,
}
#[derive(SimpleObject, Clone)]
pub struct UninhabitedPlanetDetails {
    mean_radius: CustomBigDecimal,
    mass: CustomBigInt,
}

#[derive(Clone)]
pub struct CustomBigInt(BigDecimal);
#[Scalar(name = "BigInt")]
impl ScalarType for CustomBigInt {
    fn parse(value: Value) -> InputValueResult {
        match value {
            Value::String(s) => {
                let parsed_value = BigDecimal::from_str(&s)?;
                Ok(CustomBigInt(parsed_value))
            }
            _ => Err(InputValueError::expected_type(value)),
        }
    }
    fn to_value(&self) -> Value {
        Value::String(format!("{:e}", &self))
    }
}
impl LowerExp for CustomBigInt {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        let val = &self.0.to_f64().expect("Can't convert BigDecimal");
        LowerExp::fmt(val, f)
    }
}

#[derive(Clone)]
pub struct CustomBigDecimal(BigDecimal);
#[Scalar(name = "BigDecimal")]
impl ScalarType for CustomBigDecimal {
    fn parse(value: Value) -> InputValueResult {
        match value {
            Value::String(s) => {
                let parsed_value = BigDecimal::from_str(&s)?;
                Ok(CustomBigDecimal(parsed_value))
            }
            _ => Err(InputValueError::expected_type(value)),
        }
    }
    fn to_value(&self) -> Value {
        Value::String(self.0.to_string())
    }
}

pub struct Mutation;
#[Object]
impl Mutation {
    #[graphql(guard(RoleGuard(role = "Role::Admin")))]
    async fn create_planet(&self, ctx: &Context<'_>, planet: PlanetInput) -> Result {
        let new_planet = NewPlanetEntity {
            name: planet.name,
            planet_type: planet.planet_type.to_string(),
        };
        let details = planet.details;
        let new_planet_details = NewDetailsEntity {
            mean_radius: details.mean_radius.0,
            mass: BigDecimal::from_str(&details.mass.0.to_string()).expect("Can't get BigDecimal from string"),
            population: details.population.map(|wrapper| { wrapper.0 }),
            planet_id: 0,
        };
        let created_planet_entity = repository::create(new_planet, new_planet_details, &get_conn_from_ctx(ctx))?;
        let producer = ctx.data::().expect("Can't get Kafka producer");
        let message = serde_json::to_string(&Planet::from(&created_planet_entity)).expect("Can't serialize a planet");
        kafka::send_message(producer, message).await;
        Ok(Planet::from(&created_planet_entity))
    }
}

#[derive(InputObject)]
struct PlanetInput {
    name: String,
    #[graphql(name = "type")]
    planet_type: PlanetType,
    details: DetailsInput,
}

mutation {
  createPlanet(
    planet: {
      name: "test_planet"
      type: TERRESTRIAL_PLANET
      details: { meanRadius: "10.5", mass: "8.8e24", population: "0.5" }
    }
  ) {
    id
  }
}

let producer = ctx.data::().expect("Can't get Kafka producer");
let message = serde_json::to_string(&Planet::from(&created_planet_entity)).expect("Can't serialize a planet");
kafka::send_message(producer, message).await;

pub struct Subscription;
#[Subscription]
impl Subscription {
    async fn latest_planet<'ctx>(&self, ctx: &'ctx Context<'_>) -> impl Stream + 'ctx {
        let kafka_consumer_counter = ctx.data::>().expect("Can't get Kafka consumer counter");
        let consumer_group_id = kafka::get_kafka_consumer_group_id(kafka_consumer_counter);
        let consumer = kafka::create_consumer(consumer_group_id);
        async_stream::stream! {
            let mut stream = consumer.start();
            while let Some(value) = stream.next().await {
                yield match value {
                    Ok(message) => {
                        let payload = message.payload().expect("Kafka message should contain payload");
                        let message = String::from_utf8_lossy(payload).to_string();
                        serde_json::from_str(&message).expect("Can't deserialize a planet")
                    }
                    Err(e) => panic!("Error while Kafka message processing: {}", e)
                };
            }
        }
    }
}

subscription {
  latestPlanet {
    id
    name
    type
    details {
      meanRadius
    }
  }
}

#[actix_rt::test]
async fn test_get_planets() {
    let docker = Cli::default();
    let (_pg_container, pool) = common::setup(&docker);
    let mut service = test::init_service(App::new()
        .configure(configure_service)
        .data(create_schema_with_context(pool))
    ).await;
    let query = "
        {
            getPlanets {
                id
                name
                type
                details {
                    meanRadius
                    mass
                    ... on InhabitedPlanetDetails {
                        population
                    }
                }
            }
        }
        ".to_string();
    let request_body = GraphQLCustomRequest {
        query,
        variables: Map::new(),
    };
    let request = test::TestRequest::post().uri("/").set_json(&request_body).to_request();
    let response: GraphQLCustomResponse = test::read_response_json(&mut service, request).await;
    fn get_planet_as_json(all_planets: &serde_json::Value, index: i32) -> &serde_json::Value {
        jsonpath::select(all_planets, &format!("$.getPlanets[{}]", index)).expect("Can't get planet by JSON path")[0]
    }
    let mercury_json = get_planet_as_json(&response.data, 0);
    common::check_planet(mercury_json, 1, "Mercury", "TERRESTRIAL_PLANET", "2439.7");
    let earth_json = get_planet_as_json(&response.data, 2);
    common::check_planet(earth_json, 3, "Earth", "TERRESTRIAL_PLANET", "6371.0");
    let neptune_json = get_planet_as_json(&response.data, 7);
    common::check_planet(neptune_json, 8, "Neptune", "ICE_GIANT", "24622.0");
}

const PLANET_FRAGMENT: &str = "
    fragment planetFragment on Planet {
        id
        name
        type
        details {
            meanRadius
            mass
            ... on InhabitedPlanetDetails {
                population
            }
        }
    }
";
#[actix_rt::test]
async fn test_get_planet_by_id() {
    ...
    let query = "
        {
            getPlanet(id: 3) {
                ... planetFragment
            }
        }
        ".to_string() + PLANET_FRAGMENT;
    let request_body = GraphQLCustomRequest {
        query,
        variables: Map::new(),
    };
    ...
}

#[actix_rt::test]
async fn test_get_planet_by_id_with_variable() {
    ...
    let query = "
        query testPlanetById($planetId: String!) {
            getPlanet(id: $planetId) {
                ... planetFragment
            }
        }".to_string() + PLANET_FRAGMENT;
    let jupiter_id = 5;
    let mut variables = Map::new();
    variables.insert("planetId".to_string(), jupiter_id.into());
    let request_body = GraphQLCustomRequest {
        query,
        variables,
    };
    ...
}

{
  getPlanet(id: "1") {
    satellites {
      planet {
        satellites {
          planet {
            satellites {
              ... # more deep nesting!
            }
          }
        }
      }
    }
  }
}

pub fn create_schema_with_context(pool: PgPool) -> Schema {
    ...
    Schema::build(Query, Mutation, Subscription)
        .limit_depth(3)
        .limit_complexity(15)
    ...
}

pub struct Mutation;
#[Object]
impl Mutation {
    async fn sign_in(&self, ctx: &Context<'_>, input: SignInInput) -> Result {
        let maybe_user = repository::get_user(&input.username, &get_conn_from_ctx(ctx)).ok();
        if let Some(user) = maybe_user {
            if let Ok(matching) = verify_password(&user.hash, &input.password) {
                if matching {
                    let role = AuthRole::from_str(user.role.as_str()).expect("Can't convert &str to AuthRole");
                    return Ok(common_utils::create_token(user.username, role));
                }
            }
        }
        Err(Error::new("Can't authenticate a user"))
    }
}
#[derive(InputObject)]
struct SignInInput {
    username: String,
    password: String,
}

mutation {
  signIn(input: { username: "john_doe", password: "password" })
}

async fn index(schema: web::Data, http_req: HttpRequest, req: Request) -> Response {
    let mut query = req.into_inner();
    let maybe_role = common_utils::get_role(http_req);
    if let Some(role) = maybe_role {
        query = query.data(role);
    }
    schema.execute(query).await.into()
}

#[graphql(guard(RoleGuard(role = "Role::Admin")))]

struct RoleGuard {
    role: Role,
}
#[async_trait::async_trait]
impl Guard for RoleGuard {
    async fn check(&self, ctx: &Context<'_>) -> Result<()> {
        if ctx.data_opt::() == Some(&self.role) {
            Ok(())
        } else {
            Err("Forbidden".into())
        }
    }
}

#[derive(SimpleObject)]
struct Satellite {
    ...
    life_exists: LifeExists,
}
#[derive(Copy, Clone, Eq, PartialEq, Debug, Enum, EnumString)]
#[strum(serialize_all = "SCREAMING_SNAKE_CASE")]
pub enum LifeExists {
    Yes,
    OpenQuestion,
    NoData,
}

#[derive(SimpleObject)]
struct Satellite {
    ...
    first_spacecraft_landing_date: Option,
}

#[derive(Serialize, Deserialize)]
struct Planet {
    id: ID,
    name: String,
    planet_type: PlanetType,
}

#[Object]
impl Query {
    #[graphql(entity)]
    async fn find_planet_by_id(&self, ctx: &Context<'_>, id: ID) -> Option {
        find_planet_by_id_internal(ctx, id)
    }
}

struct Planet {
    id: ID
}
#[Object(extends)]
impl Planet {
    #[graphql(external)]
    async fn id(&self) -> &ID {
        &self.id
    }
    async fn satellites(&self, ctx: &Context<'_>) -> Vec {
        let id = self.id.to_string().parse::().expect("Can't get id from String");
        repository::get_by_planet_id(id, &get_conn_from_ctx(ctx)).expect("Can't get satellites of planet")
            .iter()
            .map(|e| { Satellite::from(e) })
            .collect()
    }
}

#[Object]
impl Query {
    #[graphql(entity)]
    async fn get_planet_by_id(&self, id: ID) -> Planet {
        Planet { id }
    }
}

{
  "name": "api-gateway",
  "main": "gateway.js",
  "scripts": {
    "start-gateway": "nodemon gateway.js"
  },
  "devDependencies": {
    "concurrently": "5.3.0",
    "nodemon": "2.0.6"
  },
  "dependencies": {
    "@apollo/gateway": "0.21.3",
    "apollo-server": "2.19.0",
    "graphql": "15.4.0"
  }
}

const {ApolloServer} = require("apollo-server");
const {ApolloGateway, RemoteGraphQLDataSource} = require("@apollo/gateway");
class AuthenticatedDataSource extends RemoteGraphQLDataSource {
    willSendRequest({request, context}) {
        if (context.authHeaderValue) {
            request.http.headers.set('Authorization', context.authHeaderValue);
        }
    }
}
let node_env = process.env.NODE_ENV;
function get_service_url(service_name, port) {
    let host;
    switch (node_env) {
        case 'docker':
            host = service_name;
            break;
        case 'local': {
            host = 'localhost';
            break
        }
    }
    return "http://" + host + ":" + port;
}
const gateway = new ApolloGateway({
    serviceList: [
        {name: "planets-service", url: get_service_url("planets-service", 8001)},
        {name: "satellites-service", url: get_service_url("satellites-service", 8002)},
        {name: "auth-service", url: get_service_url("auth-service", 8003)},
    ],
    buildService({name, url}) {
        return new AuthenticatedDataSource({url});
    },
});
const server = new ApolloServer({
    gateway, subscriptions: false, context: ({req}) => ({
        authHeaderValue: req.headers.authorization
    })
});
server.listen({host: "0.0.0.0", port: 4000}).then(({url}) => {
    console.log(`? Server ready at ${url}`);
});

[nodemon] 2.0.6
[nodemon] to restart at any time, enter `rs`
[nodemon] watching path(s): *.*
[nodemon] watching extensions: js,mjs,json
[nodemon] starting `node gateway.js`
Server ready at http://0.0.0.0:4000/

subscription {
  latestPlanet {
    name
    type
  }
}

mutation {
  createPlanet(
    planet: {
      name: "Pluto"
      type: DWARF_PLANET
      details: { meanRadius: "1188", mass: "1.303e22" }
    }
  ) {
    id
  }
}