commit 116973d5ae728835e5241c108d7c195427b3ab78
Author: Peter Schiwy <me050696@ME0001.LR36.ME>
Date:   Fri May 24 14:25:46 2024 +0200

    First Commit

diff --git a/.gitignore b/.gitignore
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+ "nu-ansi-term",
+ "sharded-slab",
+ "smallvec",
+ "thread_local",
+ "tracing-core",
+ "tracing-log",
+]
+
+[[package]]
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+ "bytes",
+ "data-encoding",
+ "http",
+ "httparse",
+ "log",
+ "rand",
+ "sha1",
+ "thiserror",
+ "url",
+ "utf-8",
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+ "windows_aarch64_msvc 0.48.5",
+ "windows_i686_gnu 0.48.5",
+ "windows_i686_msvc 0.48.5",
+ "windows_x86_64_gnu 0.48.5",
+ "windows_x86_64_gnullvm 0.48.5",
+ "windows_x86_64_msvc 0.48.5",
+]
+
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+ "windows_aarch64_gnullvm 0.52.5",
+ "windows_aarch64_msvc 0.52.5",
+ "windows_i686_gnu 0.52.5",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc 0.52.5",
+ "windows_x86_64_gnu 0.52.5",
+ "windows_x86_64_gnullvm 0.52.5",
+ "windows_x86_64_msvc 0.52.5",
+]
+
+[[package]]
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..787bc7f
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,30 @@
+[package]
+name = "axum-juniper"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+tokio = { version = "1.37.0", features = [
+  "macros",
+  "net",
+  "rt-multi-thread",
+  "time",
+] }
+tokio-stream = "0.1.15"
+r2d2 = { version = "0.8.10" }
+juniper = { version = "0.16.1" }
+axum = { version = "0.7.5", features = ["json", "macros", "tokio", "tracing"] }
+juniper_axum = { version = "0.1.0", features = ["subscriptions"] }
+diesel = { version = "2.1.6", features = ["postgres", "r2d2"] }
+dotenvy = "0.15.7"
+serde = "1.0.202"
+serde_json = "1.0.117"
+futures = "0.3.30"
+anyhow = "1.0.86"
+juniper_graphql_ws = { version = "0.4.0", features = ["graphql-transport-ws"] }
+tracing = "0.1.40"
+tracing-subscriber = "0.3.18"
+
+[dev-dependencies]
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e69de29
diff --git a/diesel.toml b/diesel.toml
new file mode 100644
index 0000000..c028f4a
--- /dev/null
+++ b/diesel.toml
@@ -0,0 +1,9 @@
+# For documentation on how to configure this file,
+# see https://diesel.rs/guides/configuring-diesel-cli
+
+[print_schema]
+file = "src/schema.rs"
+custom_type_derives = ["diesel::query_builder::QueryId"]
+
+[migrations_directory]
+dir = "migrations"
diff --git a/migrations/.keep b/migrations/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/migrations/00000000000000_diesel_initial_setup/down.sql b/migrations/00000000000000_diesel_initial_setup/down.sql
new file mode 100644
index 0000000..a9f5260
--- /dev/null
+++ b/migrations/00000000000000_diesel_initial_setup/down.sql
@@ -0,0 +1,6 @@
+-- This file was automatically created by Diesel to setup helper functions
+-- and other internal bookkeeping. This file is safe to edit, any future
+-- changes will be added to existing projects as new migrations.
+
+DROP FUNCTION IF EXISTS diesel_manage_updated_at(_tbl regclass);
+DROP FUNCTION IF EXISTS diesel_set_updated_at();
diff --git a/migrations/00000000000000_diesel_initial_setup/up.sql b/migrations/00000000000000_diesel_initial_setup/up.sql
new file mode 100644
index 0000000..d68895b
--- /dev/null
+++ b/migrations/00000000000000_diesel_initial_setup/up.sql
@@ -0,0 +1,36 @@
+-- This file was automatically created by Diesel to setup helper functions
+-- and other internal bookkeeping. This file is safe to edit, any future
+-- changes will be added to existing projects as new migrations.
+
+
+
+
+-- Sets up a trigger for the given table to automatically set a column called
+-- `updated_at` whenever the row is modified (unless `updated_at` was included
+-- in the modified columns)
+--
+-- # Example
+--
+-- ```sql
+-- CREATE TABLE users (id SERIAL PRIMARY KEY, updated_at TIMESTAMP NOT NULL DEFAULT NOW());
+--
+-- SELECT diesel_manage_updated_at('users');
+-- ```
+CREATE OR REPLACE FUNCTION diesel_manage_updated_at(_tbl regclass) RETURNS VOID AS $$
+BEGIN
+    EXECUTE format('CREATE TRIGGER set_updated_at BEFORE UPDATE ON %s
+                    FOR EACH ROW EXECUTE PROCEDURE diesel_set_updated_at()', _tbl);
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION diesel_set_updated_at() RETURNS trigger AS $$
+BEGIN
+    IF (
+        NEW IS DISTINCT FROM OLD AND
+        NEW.updated_at IS NOT DISTINCT FROM OLD.updated_at
+    ) THEN
+        NEW.updated_at := current_timestamp;
+    END IF;
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
diff --git a/migrations/2024-05-21-102617_typ/down.sql b/migrations/2024-05-21-102617_typ/down.sql
new file mode 100644
index 0000000..b9fb0c8
--- /dev/null
+++ b/migrations/2024-05-21-102617_typ/down.sql
@@ -0,0 +1 @@
+DROP TABLE typen;-- This file should undo anything in `up.sql`
diff --git a/migrations/2024-05-21-102617_typ/up.sql b/migrations/2024-05-21-102617_typ/up.sql
new file mode 100644
index 0000000..6641b4a
--- /dev/null
+++ b/migrations/2024-05-21-102617_typ/up.sql
@@ -0,0 +1,4 @@
+CREATE TABLE typen (
+  id SERIAL PRIMARY KEY,
+  name VARCHAR NOT NULL
+);
diff --git a/migrations/2024-05-21-102624_hersteller/down.sql b/migrations/2024-05-21-102624_hersteller/down.sql
new file mode 100644
index 0000000..c7d9f07
--- /dev/null
+++ b/migrations/2024-05-21-102624_hersteller/down.sql
@@ -0,0 +1 @@
+DROP TABLE hersteller;
diff --git a/migrations/2024-05-21-102624_hersteller/up.sql b/migrations/2024-05-21-102624_hersteller/up.sql
new file mode 100644
index 0000000..649abb8
--- /dev/null
+++ b/migrations/2024-05-21-102624_hersteller/up.sql
@@ -0,0 +1,4 @@
+CREATE TABLE hersteller (
+  id SERIAL PRIMARY KEY,
+  name VARCHAR NOT NULL
+);
diff --git a/migrations/2024-05-21-102702_modell/down.sql b/migrations/2024-05-21-102702_modell/down.sql
new file mode 100644
index 0000000..e13f93c
--- /dev/null
+++ b/migrations/2024-05-21-102702_modell/down.sql
@@ -0,0 +1 @@
+DROP TABLE modelle;
diff --git a/migrations/2024-05-21-102702_modell/up.sql b/migrations/2024-05-21-102702_modell/up.sql
new file mode 100644
index 0000000..24dd399
--- /dev/null
+++ b/migrations/2024-05-21-102702_modell/up.sql
@@ -0,0 +1,8 @@
+CREATE TABLE modelle (
+  id SERIAL PRIMARY KEY,
+  name VARCHAR NOT NULL,
+  typ_id SERIAL,
+  hersteller_id SERIAL,
+  CONSTRAINT fk_typ FOREIGN KEY(typ_id) REFERENCES typen(id),
+  CONSTRAINT fk_hersteller FOREIGN KEY (hersteller_id) REFERENCES hersteller(id)
+)
diff --git a/src/database.rs b/src/database.rs
new file mode 100644
index 0000000..279d9ed
--- /dev/null
+++ b/src/database.rs
@@ -0,0 +1,39 @@
+use diesel::r2d2::{ConnectionManager, Pool, PoolError};
+use diesel::PgConnection;
+use dotenvy::dotenv;
+use std::env;
+
+pub type PgPool = Pool<ConnectionManager<PgConnection>>;
+
+fn init_pool(database_url: &str) -> Result<PgPool, PoolError> {
+    let manager = ConnectionManager::<PgConnection>::new(database_url);
+    Pool::builder().build(manager)
+}
+
+fn establish_connection() -> PgPool {
+    dotenv().ok();
+
+    let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set");
+    init_pool(&database_url).unwrap_or_else(|_| panic!("Could not create database pool"))
+}
+
+#[derive(Clone, Debug)]
+pub struct Database {
+    pub pool: PgPool,
+}
+
+impl Database {
+    pub fn new() -> Database {
+        Database {
+            pool: establish_connection(),
+        }
+    }
+}
+
+impl Default for Database {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl juniper::Context for Database {}
diff --git a/src/diesel_dao/mod.rs b/src/diesel_dao/mod.rs
new file mode 100644
index 0000000..1879d29
--- /dev/null
+++ b/src/diesel_dao/mod.rs
@@ -0,0 +1 @@
+pub mod typ_dao;
diff --git a/src/diesel_dao/typ_dao.rs b/src/diesel_dao/typ_dao.rs
new file mode 100644
index 0000000..1a68b11
--- /dev/null
+++ b/src/diesel_dao/typ_dao.rs
@@ -0,0 +1,28 @@
+use crate::{database::Database, models::typ::Typ};
+use anyhow::{Ok, Result};
+use diesel::{QueryDsl, RunQueryDsl, SelectableHelper};
+
+pub struct TypDAO {}
+
+impl TypDAO {
+    pub fn get_all_typen(context: &Database) -> Result<Vec<Typ>> {
+        use crate::schema::typen::dsl::*;
+        let connection = &mut context.pool.get()?;
+
+        let alle_typen = typen.load::<Typ>(connection)?;
+
+        Ok(alle_typen)
+    }
+
+    pub fn get_typ_by_id(context: &Database, typ_id: i32) -> Result<Typ> {
+        use crate::schema::typen::dsl::*;
+        let connection = &mut context.pool.get()?;
+
+        let typ = typen
+            .find(typ_id)
+            .select(Typ::as_select())
+            .first(connection)?;
+
+        Ok(typ)
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..3b5d641
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,74 @@
+mod database;
+mod diesel_dao;
+mod models;
+mod mutation;
+mod query;
+mod schema;
+mod subscription;
+
+use std::{net::SocketAddr, sync::Arc};
+
+use axum::{
+    response::Html,
+    routing::{get, on, MethodFilter},
+    Extension, Router,
+};
+use juniper::RootNode;
+use juniper_axum::{graphiql, graphql, playground, subscriptions};
+use juniper_graphql_ws::ConnectionConfig;
+use mutation::Mutation;
+use query::Query;
+use subscription::Subscription;
+use tokio::net::TcpListener;
+
+use crate::database::Database;
+
+type Schema = RootNode<'static, Query, Mutation, Subscription>;
+
+async fn homepage() -> Html<&'static str> {
+    "<html><h1>juniper_axum/simple example</h1>\
+           <div>visit <a href=\"/graphiql\">GraphiQL</a></div>\
+           <div>visit <a href=\"/playground\">GraphQL Playground</a></div>\
+    </html>"
+        .into()
+}
+
+#[tokio::main]
+async fn main() {
+    tracing_subscriber::fmt()
+        .with_max_level(tracing::Level::INFO)
+        .init();
+
+    let database = Database::new();
+    let schema = Schema::new(Query, Mutation, Subscription);
+
+    let app = Router::new()
+        .route(
+            "/graphql",
+            on(
+                MethodFilter::GET.or(MethodFilter::POST),
+                graphql::<Arc<Schema>>,
+            ),
+        )
+        .route(
+            "/subscriptions",
+            get(subscriptions::ws::<Arc<Schema>>(ConnectionConfig::new(
+                database,
+            ))),
+        )
+        .route("/graphiql", get(graphiql("/graphql", "/subscriptions")))
+        .route("/playground", get(playground("/graphql", "/subscriptions")))
+        .route("/", get(homepage))
+        .layer(Extension(Arc::new(schema)));
+
+    let addr = SocketAddr::from(([127, 0, 0, 1], 8080));
+    let listener = TcpListener::bind(addr)
+        .await
+        .unwrap_or_else(|e| panic!("failed to listen on {addr}: {e}"));
+
+    tracing::info!("listening on {addr}");
+
+    axum::serve(listener, app)
+        .await
+        .unwrap_or_else(|e| panic!("failed to run `axum::serve`: {e}"));
+}
diff --git a/src/models/hersteller.rs b/src/models/hersteller.rs
new file mode 100644
index 0000000..286961f
--- /dev/null
+++ b/src/models/hersteller.rs
@@ -0,0 +1,8 @@
+use diesel::Queryable;
+
+#[derive(Queryable, Debug)]
+#[diesel(table_name = hersteller)]
+pub struct Hersteller {
+    pub id: i32,
+    pub name: String,
+}
diff --git a/src/models/mod.rs b/src/models/mod.rs
new file mode 100644
index 0000000..b1197d1
--- /dev/null
+++ b/src/models/mod.rs
@@ -0,0 +1,4 @@
+pub mod hersteller;
+pub mod modell;
+pub mod typ;
+
diff --git a/src/models/modell.rs b/src/models/modell.rs
new file mode 100644
index 0000000..9680c45
--- /dev/null
+++ b/src/models/modell.rs
@@ -0,0 +1,10 @@
+use diesel::Queryable;
+
+#[derive(Queryable, Debug)]
+#[diesel(table_name = modelle)]
+pub struct Modell {
+    pub id: i32,
+    pub name: String,
+    pub typ_id: i32,
+    pub hersteller_id: i32,
+}
diff --git a/src/models/typ.rs b/src/models/typ.rs
new file mode 100644
index 0000000..cd36952
--- /dev/null
+++ b/src/models/typ.rs
@@ -0,0 +1,23 @@
+use diesel::{associations::Identifiable, prelude::Insertable, Queryable, Selectable};
+use juniper::{GraphQLInputObject, GraphQLObject};
+
+use crate::schema::typen;
+
+#[derive(GraphQLObject, Queryable, Selectable, Identifiable)]
+#[diesel(table_name = typen)]
+pub struct Typ {
+    pub id: i32,
+    pub name: String,
+}
+
+#[derive(GraphQLInputObject, Insertable)]
+#[diesel(table_name = typen)]
+pub struct TypInput {
+    pub name: String,
+}
+
+#[derive(GraphQLObject)]
+pub struct TypResponse {
+    pub id: i32,
+    pub name: String,
+}
diff --git a/src/mutation.rs b/src/mutation.rs
new file mode 100644
index 0000000..408efb7
--- /dev/null
+++ b/src/mutation.rs
@@ -0,0 +1,47 @@
+use crate::{
+    database::Database,
+    models::typ::{Typ, TypInput},
+    schema::typen,
+};
+use diesel::prelude::*;
+use juniper::{graphql_object, FieldResult};
+
+#[derive(Clone, Copy, Debug)]
+pub struct Mutation;
+
+#[graphql_object(context = Database)]
+impl Mutation {
+    fn new_typ(#[graphql(context)] database: &Database, typ_input: TypInput) -> FieldResult<Typ> {
+        let connection = &mut database.pool.get()?;
+
+        let typ = diesel::insert_into(typen::table)
+            .values(&typ_input)
+            .get_result::<Typ>(connection)?;
+
+        Ok(typ)
+    }
+
+    fn edit_typ(
+        #[graphql(context)] database: &Database,
+        typ_id: i32,
+        typ_name: String,
+    ) -> FieldResult<Typ> {
+        use crate::schema::typen::dsl::*;
+        let connection = &mut database.pool.get()?;
+
+        let update_typ = diesel::update(typen.find(typ_id))
+            .set(name.eq(typ_name))
+            .get_result::<Typ>(connection)?;
+
+        Ok(update_typ)
+    }
+
+    fn delete_typ(#[graphql(context)] database: &Database, typ_id: i32) -> FieldResult<String> {
+        use crate::schema::typen::dsl::*;
+        let conn = &mut database.pool.get()?;
+
+        diesel::delete(typen.find(typ_id)).execute(conn)?;
+
+        Ok("Typ wurde erfolgreich gelöscht".to_string())
+    }
+}
diff --git a/src/query.rs b/src/query.rs
new file mode 100644
index 0000000..0189e10
--- /dev/null
+++ b/src/query.rs
@@ -0,0 +1,22 @@
+use crate::{database::Database, diesel_dao::typ_dao::TypDAO, models::typ::Typ};
+use juniper::{graphql_object, FieldResult};
+
+pub struct Query;
+
+#[graphql_object(context = Database)]
+impl Query {
+    /// Zeigt alle Gerätetypen an.
+    fn typen(#[graphql(context)] context: &Database) -> FieldResult<Vec<Typ>> {
+        let alle_typen = TypDAO::get_all_typen(context)?;
+        Ok(alle_typen)
+    }
+
+    /// Zeigt einen Gerätetypen an
+    fn typ(
+        #[graphql(context)] context: &Database,
+        #[graphql(description = "Die ID des Typs.")] typ_id: i32,
+    ) -> FieldResult<Typ> {
+        let typ = TypDAO::get_typ_by_id(context, typ_id)?;
+        Ok(typ)
+    }
+}
diff --git a/src/schema.rs b/src/schema.rs
new file mode 100644
index 0000000..9413b72
--- /dev/null
+++ b/src/schema.rs
@@ -0,0 +1,33 @@
+// @generated automatically by Diesel CLI.
+
+diesel::table! {
+    hersteller (id) {
+        id -> Int4,
+        name -> Varchar,
+    }
+}
+
+diesel::table! {
+    modelle (id) {
+        id -> Int4,
+        name -> Varchar,
+        typ_id -> Int4,
+        hersteller_id -> Int4,
+    }
+}
+
+diesel::table! {
+    typen (id) {
+        id -> Int4,
+        name -> Varchar,
+    }
+}
+
+diesel::joinable!(modelle -> hersteller (hersteller_id));
+diesel::joinable!(modelle -> typen (typ_id));
+
+diesel::allow_tables_to_appear_in_same_query!(
+    hersteller,
+    modelle,
+    typen,
+);
diff --git a/src/subscription.rs b/src/subscription.rs
new file mode 100644
index 0000000..978245d
--- /dev/null
+++ b/src/subscription.rs
@@ -0,0 +1,25 @@
+use futures::stream::{BoxStream, StreamExt as _};
+use juniper::{graphql_subscription, FieldError};
+use std::time::Duration;
+use tokio::time::interval;
+use tokio_stream::wrappers::IntervalStream;
+
+use crate::database::Database;
+
+#[derive(Clone, Copy, Debug)]
+pub struct Subscription;
+
+type NumberStream = BoxStream<'static, Result<i32, FieldError>>;
+
+#[graphql_subscription(context = Database)]
+impl Subscription {
+    /// Counts seconds.
+    async fn count() -> NumberStream {
+        let mut value = 0;
+        let stream = IntervalStream::new(interval(Duration::from_secs(1))).map(move |_| {
+            value += 1;
+            Ok(value)
+        });
+        Box::pin(stream)
+    }
+}