HTTP server for health introspection

This commit is contained in:
Rafael Caricio 2022-10-01 17:38:03 +02:00
parent 45b1be505b
commit 65a4980294
Signed by: rafaelcaricio
GPG key ID: 3C86DBCE8E93C947
4 changed files with 717 additions and 21 deletions

569
Cargo.lock generated
View file

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checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f" checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
[[package]]
name = "want"
version = "0.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1ce8a968cb1cd110d136ff8b819a556d6fb6d919363c61534f6860c7eb172ba0"
dependencies = [
"log",
"try-lock",
]
[[package]]
name = "wasi"
version = "0.11.0+wasi-snapshot-preview1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
[[package]]
name = "winapi"
version = "0.3.9"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
dependencies = [
"winapi-i686-pc-windows-gnu",
"winapi-x86_64-pc-windows-gnu",
]
[[package]]
name = "winapi-i686-pc-windows-gnu"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
[[package]]
name = "winapi-x86_64-pc-windows-gnu"
version = "0.4.0"
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"

View file

@ -1,5 +1,5 @@
[package] [package]
name = "${REPO_NAME_LOWER}" name = "bla" #"${REPO_NAME_LOWER}"
license = "MPL-2.0" license = "MPL-2.0"
version = "0.1.0" version = "0.1.0"
edition = "2021" 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-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" } gst-app = { package = "gstreamer-app", git = "https://gitlab.freedesktop.org/gstreamer/gstreamer-rs" }
anyhow = "1" 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"] }

View file

@ -1,24 +1,28 @@
mod server;
use anyhow::Result; use anyhow::Result;
use gst::prelude::*;
use gst::glib; use gst::glib;
use gst::glib::once_cell::sync::Lazy; 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(|| { 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<()> { fn main() -> Result<()> {
gst::init()?; gst::init()?;
let pipeline = gst::parse_launch(r#" let pipeline = gst::parse_launch(
r#"
videotestsrc ! videoconvert ! timeoverlay shaded-background=true ! gtksink videotestsrc ! videoconvert ! timeoverlay shaded-background=true ! gtksink
"#,)?.downcast::<gst::Pipeline>().unwrap(); "#,
)?
.downcast::<gst::Pipeline>()
.unwrap();
let context = glib::MainContext::default(); let context = glib::MainContext::default();
let main_loop = glib::MainLoop::new(Some(&context), false); let main_loop = glib::MainLoop::new(Some(&context), false);
@ -49,6 +53,28 @@ fn main() -> Result<()> {
}) })
.expect("Failed to add bus watch"); .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(); main_loop.run();
pipeline.set_state(gst::State::Null)?; pipeline.set_state(gst::State::Null)?;

118
src/server.rs Normal file
View file

@ -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()
}