Added routing example

examples/routing.rs

@@ -0,0 +1,53 @@
+use anyhow::*;
+use futures_core::future::BoxFuture;
+use futures_util::FutureExt;
+use log::LevelFilter;
+use northstar::{Document, document::HeadingLevel, Request, Response, GEMINI_PORT};
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    env_logger::builder()
+        .filter_module("northstar", LevelFilter::Debug)
+        .init();
+
+    northstar::Server::bind(("localhost", GEMINI_PORT))
+        .add_route("/", handle_base)
+        .add_route("/route", handle_short)
+        .add_route("/route/long", handle_long)
+        .serve()
+        .await
+}
+
+fn handle_base(_: Request) -> BoxFuture<'static, Result<Response>> {
+    let doc = generate_doc("base");
+    async move {
+        Ok(Response::document(doc))
+    }.boxed()
+}
+
+fn handle_short(_: Request) -> BoxFuture<'static, Result<Response>> {
+    let doc = generate_doc("short");
+    async move {
+        Ok(Response::document(doc))
+    }.boxed()
+}
+
+fn handle_long(_: Request) -> BoxFuture<'static, Result<Response>> {
+    let doc = generate_doc("long");
+    async move {
+        Ok(Response::document(doc))
+    }.boxed()
+}
+
+fn generate_doc(route_name: &str) -> Document {
+    let mut doc = Document::new();
+    doc.add_heading(HeadingLevel::H1, "Routing Demo")
+       .add_text(&format!("You're currently on the {} route", route_name))
+       .add_blank_line()
+       .add_text("Here's some links to try:")
+       .add_link_without_label("/")
+       .add_link_without_label("/route")
+       .add_link_without_label("/route/long")
+       .add_link_without_label("/route/not_real");
+    doc
+}