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/target

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[package]
name = "rust-graphql-example"
version = "0.1.0"
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
juniper_rocket = "0.8.0"
juniper = "0.15.7"
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"
[dependencies.rocket]
version = "0.5.0-rc.1"
features = ["json"]

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# Playing around with Rust, Rocket, Juniper
Little demo/test playing with Rust, Rocket, Juniper to get a GraphQL interface to a list of names basicly.
My Rust knowlage is rusty.. took me most of a day to get something together to compile a schema. Threadsafey was killing me on that incrementing id for about two hours. By the end when wrapping that `.values()` iter in a Juniper `graphql_object` I actually wrote that and it compiled first time! Very Wow.
![Screenshot of me using the Graphiql interface hosted by the app](https://xeen.dev/alex/rust-graphql-goof/raw/branch/binary/demo.png)

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use rocket::fairing::AdHoc;
use rocket::{ response::content, State };
use juniper::{ EmptySubscription };
use crate::model::Database;
use crate::schema::{ Schema, Query, Mutations };
#[rocket::get("/graphiql")]
fn graphiql() -> content::Html<String> {
juniper_rocket::graphiql_source("/graphql/", None)
}
#[rocket::get("/?<request>")]
fn get_graphql_handler(
context: &State<Database>,
request: juniper_rocket::GraphQLRequest,
schema: &State<Schema>,
) -> juniper_rocket::GraphQLResponse {
request.execute_sync(&*schema, &*context)
}
#[rocket::post("/", data = "<request>")]
fn post_graphql_handler(
context: &State<Database>,
request: juniper_rocket::GraphQLRequest,
schema: &State<Schema>,
) -> juniper_rocket::GraphQLResponse {
request.execute_sync(&*schema, &*context)
}
pub fn stage() -> AdHoc {
let schema = Schema::new(
Query,
Mutations,
EmptySubscription::<Database>::new(),
);
AdHoc::on_ignite("Add graphql endpoints", |rocket| async {
rocket
.mount("/graphql", rocket::routes![graphiql, get_graphql_handler, post_graphql_handler])
.manage(schema)
})
}

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use rocket::Rocket;
use model::Database;
mod graphql;
mod model;
mod rest;
mod schema;
#[rocket::main]
async fn main() {
Rocket::build()
.attach(graphql::stage())
.attach(rest::stage())
.manage(Database::new())
.launch()
.await
.expect("server to launch");
}

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use std::sync::{ atomic::AtomicUsize, atomic::Ordering, Mutex };
use std::{ collections::HashMap };
use serde::{Deserialize, Serialize};
#[derive(Clone, Serialize, Deserialize)]
pub struct Person {
id: String,
name: String,
}
impl Person {
pub fn new(id: String, name: String) -> Person {
Person { id, name }
}
pub fn id(&self) -> &str {
self.id.as_str()
}
pub fn name(&self) -> Option<&str> {
Some(self.name.as_str())
}
}
#[derive(Default)]
pub struct Database {
people: Mutex<HashMap<String, Person>>,
next_id: AtomicUsize,
}
impl Database {
pub fn new() -> Database {
let database = Database {
people: Mutex::new(HashMap::new()),
next_id: AtomicUsize::new(1),
};
database
}
pub fn get_person(&self, id: &str) -> Option<Person> {
let people = self.people.lock().expect("Couldn't lock people");
match people.get(id) {
Some(person) => Some(person.to_owned()),
None => None,
}
}
pub fn list_people(&self) -> Vec<Person> {
self.people.lock().expect("lock people").values().map(|person| person.to_owned()).collect()
}
pub fn add_person(&self, person: Person) {
self.people.lock().expect("Couldn't lock people").insert(person.id.to_owned(), person);
}
pub fn new_id(&self) -> usize {
self.next_id.fetch_add(1, Ordering::Relaxed)
}
pub fn new_person(&self, name: String) -> Option<Person> {
let person = Person {
id: self.new_id().to_string(),
name,
};
self.people.lock().expect("lock people hashmap").insert(person.id.to_owned(), person.to_owned());
Some(person)
}
}

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use rocket::fairing::AdHoc;
use rocket::serde::json::Json;
use rocket::State;
use crate::model::{
Database,
Person,
};
#[rocket::get("/people", format = "json")]
fn people_list(context: &State<Database>) -> Json<Vec<Person>> {
Json(context.list_people())
}
#[rocket::get("/people/<id>", format = "json")]
fn people_detail(id: String, context: &State<Database>) -> Option<Json<Person>> {
match context.get_person(&id) {
None => None,
Some(person) => Some(Json(person))
}
}
pub fn stage() -> AdHoc {
AdHoc::on_ignite("Add REST endpoint", |rocket| async {
rocket
.mount("/rest", rocket::routes![people_detail, people_list])
})
}

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impl Context for Database {}
use juniper::{ EmptySubscription, RootNode, graphql_object, Context };
use crate::model::{ Database, Person };
#[graphql_object(context = Database)]
impl Person {
fn id(&self) -> &str {
self.id()
}
fn name(&self) -> Option<&str> {
self.name()
}
}
pub struct Query;
#[graphql_object(context = Database)]
impl Query {
#[graphql(arguments(id(description = "id of the person")))]
fn personById(database: &Database, id: String) -> Option<Person> {
database.get_person(&id)
}
fn people(database: &Database) -> Vec<Person> {
database.list_people()
}
}
pub struct Mutations;
#[graphql_object(context = Database)]
impl Mutations {
fn addHuman(database: &Database, id: String, name: String) -> Person {
let new_guy = Person::new(id, name);
database.add_person(new_guy.to_owned());
new_guy.to_owned()
}
fn newId(database: &Database) -> i32 {
database.new_id() as i32
}
fn newPerson(database: &Database, name: String) -> Option<Person> {
database.new_person(name)
}
}
pub type Schema = RootNode<'static, Query, Mutations, EmptySubscription<Database>>;

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