HTTP server for health introspection

Cargo.lock

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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "windows-sys"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ea04155a16a59f9eab786fe12a4a450e75cdb175f9e0d80da1e17db09f55b8d2"
+dependencies = [
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9bb8c3fd39ade2d67e9874ac4f3db21f0d710bee00fe7cab16949ec184eeaa47"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "180e6ccf01daf4c426b846dfc66db1fc518f074baa793aa7d9b9aaeffad6a3b6"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2e7917148b2812d1eeafaeb22a97e4813dfa60a3f8f78ebe204bcc88f12f024"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4dcd171b8776c41b97521e5da127a2d86ad280114807d0b2ab1e462bc764d9e1"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c811ca4a8c853ef420abd8592ba53ddbbac90410fab6903b3e79972a631f7680"

Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "${REPO_NAME_LOWER}"
+name = "bla" #"${REPO_NAME_LOWER}"
 license = "MPL-2.0"
 version = "0.1.0"
 edition = "2021"
@@ -12,3 +12,8 @@ gst-video = { package = "gstreamer-video", git = "https://gitlab.freedesktop.org
 gst-audio = { package = "gstreamer-audio", git = "https://gitlab.freedesktop.org/gstreamer/gstreamer-rs" }
 gst-app = { package = "gstreamer-app", git = "https://gitlab.freedesktop.org/gstreamer/gstreamer-rs" }
 anyhow = "1"
+ctrlc = "3.2"
+tokio = { version = "1.17", features = ["full"] }
+axum = "0.5"
+tower = "0.4"
+tower-http = { version = "0.3", features = ["add-extension"] }

src/main.rs

@@ -1,24 +1,28 @@
+mod server;
+
 use anyhow::Result;
-use gst::prelude::*;
 use gst::glib;
 use gst::glib::once_cell::sync::Lazy;
+use gst::prelude::*;
+use std::{process, thread};
+use tokio::runtime::Builder;
 
 static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
-    gst::DebugCategory::new(
+    gst::DebugCategory::new("main", gst::DebugColorFlags::empty(), Some("Main function"))
-        "main",
-        gst::DebugColorFlags::empty(),
-        Some("Main function"),
-    )
 });
 
 fn main() -> Result<()> {
     gst::init()?;
 
-    let pipeline = gst::parse_launch(r#"
+    let pipeline = gst::parse_launch(
+        r#"
 
     videotestsrc ! videoconvert ! timeoverlay shaded-background=true ! gtksink
 
-    "#,)?.downcast::<gst::Pipeline>().unwrap();
+    "#,
+    )?
+    .downcast::<gst::Pipeline>()
+    .unwrap();
 
     let context = glib::MainContext::default();
     let main_loop = glib::MainLoop::new(Some(&context), false);
@@ -49,6 +53,28 @@ fn main() -> Result<()> {
     })
     .expect("Failed to add bus watch");
 
+    thread::spawn({
+        let pipeline_weak = pipeline.downgrade();
+        move || {
+            let runtime = Builder::new_multi_thread()
+                .worker_threads(2)
+                .thread_name("http-server")
+                .enable_all()
+                .build()
+                .unwrap();
+            runtime.block_on(server::run(8080, pipeline_weak))
+        }
+    });
+
+    ctrlc::set_handler({
+        let pipeline_weak = pipeline.downgrade();
+        move || {
+            let pipeline = pipeline_weak.upgrade().unwrap();
+            pipeline.set_state(gst::State::Null).unwrap();
+            process::exit(0);
+        }
+    })?;
+
     main_loop.run();
 
     pipeline.set_state(gst::State::Null)?;

src/server.rs

@@ -0,0 +1,118 @@
+use axum::extract::Extension;
+use axum::http::{header, StatusCode};
+use axum::response::IntoResponse;
+use axum::{response, response::Html, routing::get, Router, Server};
+use gst::glib;
+use gst::glib::once_cell::sync::Lazy;
+use gst::prelude::*;
+use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+use std::process::Stdio;
+use std::sync::Arc;
+use tokio::io::AsyncWriteExt;
+use tokio::process::Command;
+use tokio::sync::RwLock;
+use tower::ServiceBuilder;
+
+static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
+    gst::DebugCategory::new(
+        "server",
+        gst::DebugColorFlags::empty(),
+        Some("HTTP server sidecar"),
+    )
+});
+
+type SharedState = Arc<RwLock<State>>;
+
+struct State {
+    pipeline: glib::WeakRef<gst::Pipeline>,
+}
+
+impl State {
+    fn new(pipeline: glib::WeakRef<gst::Pipeline>) -> Self {
+        Self { pipeline }
+    }
+}
+
+pub async fn run(port: u16, pipeline_weak: glib::WeakRef<gst::Pipeline>) {
+    let addr = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), port);
+    let router = Router::new()
+        .route("/healthcheck", get(healthcheck))
+        .route("/pipeline-diagram", get(pipeline_diagram))
+        .route("/pipeline-diagram.png", get(pipeline_diagram_image))
+        .layer(
+            ServiceBuilder::new()
+                .layer(Extension(SharedState::new(RwLock::new(State::new(
+                    pipeline_weak,
+                )))))
+                .into_inner(),
+        );
+    let server = Server::bind(&addr).serve(router.into_make_service());
+    if let Err(e) = server.await {
+        gst::error!(CAT, "server error: {}", e);
+    }
+}
+
+async fn healthcheck(Extension(state): Extension<SharedState>) -> Html<String> {
+    if let Some(_pipeline) = &state.read().await.pipeline.upgrade() {
+        Html("<h1>Info</h1><br>Add some interesting stats here...".into())
+    } else {
+        Html("<h1>Pipeline gone...</h1>".into())
+    }
+}
+
+async fn pipeline_diagram(Extension(state): Extension<SharedState>) -> Html<String> {
+    if let Some(pipeline) = &state.read().await.pipeline.upgrade() {
+        Html(dot_graph(pipeline))
+    } else {
+        Html("<h1>Pipeline gone...</h1>".into())
+    }
+}
+
+async fn pipeline_diagram_image(Extension(state): Extension<SharedState>) -> impl IntoResponse {
+    if let Some(pipeline) = &state.read().await.pipeline.upgrade() {
+        let headers = response::AppendHeaders([(header::CONTENT_TYPE, "image/png")]);
+
+        let mut dot_cmd = Command::new("dot")
+            .arg("-Tpng")
+            .stdin(Stdio::piped())
+            .stdout(Stdio::piped())
+            .spawn()
+            .map_err(|err| {
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    format!("Sub-command error: {:?}", err.to_string()),
+                )
+            })?;
+
+        dot_cmd
+            .stdin
+            .take()
+            .as_mut()
+            .expect("Command to accept stdin")
+            .write_all(dot_graph(pipeline).as_bytes())
+            .await
+            .expect("Write dot graph contents to pipe");
+
+        let res = dot_cmd
+            .wait_with_output()
+            .await
+            .expect("Wait final execution of dot command");
+
+        if !res.status.success() {
+            return Err((
+                StatusCode::INTERNAL_SERVER_ERROR,
+                format!("Command exited: {:?}", res.status.to_string()),
+            ));
+        }
+
+        Ok((headers, res.stdout))
+    } else {
+        Err((StatusCode::NOT_FOUND, "Pipeline is gone!".to_string()))
+    }
+}
+
+fn dot_graph(pipeline: &gst::Pipeline) -> String {
+    pipeline
+        .debug_to_dot_data(gst::DebugGraphDetails::all())
+        .to_string()
+}