setup basic playground server

Cargo.toml

@@ -6,3 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+juniper = "0.15.11"
+juniper_warp = "0.7.0"
+tokio = { version = "1.34.0", features = ["macros"] }
+warp = "0.3.6"

src/main.rs

@@ -1,3 +1,40 @@
-fn main() {
-    println!("Hello, world!");
+use juniper::graphql_object;
+use juniper::EmptyMutation;
+use juniper::EmptySubscription;
+use juniper::RootNode;
+use warp::Filter;
+
+#[derive(Clone)]
+struct Context;
+
+impl juniper::Context for Context {}
+
+struct Query;
+
+#[graphql_object(context = Context)]
+impl Query {
+    fn hello() -> &'static str {
+        "hello world"
+    }
+}
+
+type Schema = RootNode<'static, Query, EmptyMutation<Context>, EmptySubscription<Context>>;
+
+fn schema() -> Schema {
+    Schema::new(Query, EmptyMutation::new(), EmptySubscription::new())
+}
+
+#[tokio::main]
+async fn main() {
+    let routes = (warp::post()
+        .and(warp::path("graphql"))
+        .and(juniper_warp::make_graphql_filter(
+            schema(),
+            warp::any().map(|| Context).boxed(),
+        )))
+    .or(warp::get()
+        .and(warp::path("playground"))
+        .and(juniper_warp::playground_filter("/graphql", None)));
+
+    warp::serve(routes).run(([127, 0, 0, 1], 8080)).await;
 }