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"0.4", features = ["util"] } +tower-http = { version = "0.4", features = ["fs", "trace"] } +futures = "0.3" +tracing = "0.1" +tracing-subscriber = { version = "0.3", features = ["env-filter", "json"] } +serde = { version = "1.0", features = ["derive"] } +serde_json = "1.0" +chrono = "0.4" +clap = { version = "4", features = ["derive", "env", "cargo"] } +askama = "0.12" diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..055e0d3 --- /dev/null +++ b/Dockerfile @@ -0,0 +1,49 @@ +################################ +#### Build +FROM rust:1.69.0 as builder +ENV PKG_CONFIG_ALLOW_CROSS=1 + +# Build prep +RUN apt-get update +RUN apt-get install musl-tools libssl-dev build-essential -y +RUN rustup target add x86_64-unknown-linux-musl +WORKDIR /usr/src +RUN USER=root cargo new kubepulse +COPY Cargo.toml Cargo.lock /usr/src/kubepulse/ +COPY templates /usr/src/kubepulse/templates +WORKDIR /usr/src/kubepulse +RUN cargo build --target x86_64-unknown-linux-musl --release +COPY src /usr/src/kubepulse/src/ +RUN touch /usr/src/kubepulse/src/main.rs + +# Actual build +RUN cargo build --target x86_64-unknown-linux-musl --release + +################################ +#### Runtime +FROM alpine:3.18 as runtime + +WORKDIR /app + +# Create the non-root user +RUN addgroup -S appadmin -g 1000 && adduser -S appadmin -G appadmin -D -u 1000 + +# Don't touch these +ENV LC_COLLATE en_US.UTF-8 +ENV LC_CTYPE UTF-8 +ENV LC_MESSAGES en_US.UTF-8 +ENV LC_MONETARY en_US.UTF-8 +ENV LC_NUMERIC en_US.UTF-8 +ENV LC_TIME en_US.UTF-8 +ENV LC_ALL en_US.UTF-8 +ENV LANG en_US.UTF-8 + +# Copy the binary +COPY --from=builder /usr/src/kubepulse/target/x86_64-unknown-linux-musl/release/kubepulse /usr/local/bin/kubepulse +COPY --from=builder /usr/src/kubepulse/templates/assets /app/assets +RUN chmod +x /usr/local/bin/kubepulse +RUN chown appadmin:appadmin /usr/local/bin/kubepulse + +# Run as non-root +USER appadmin +CMD ["/usr/local/bin/kubepulse"] diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..ae268e6 --- /dev/null +++ b/Makefile @@ -0,0 +1,16 @@ +REGISTRY ?= quay.io +REPOSITORY ?= duk4s +NAME ?= kubepulse +VERSION ?= $(shell awk -F'"' '/version =/{print $$2; exit}' Cargo.toml) +IMAGE = $(REGISTRY)/$(REPOSITORY)/$(NAME) + +.PHONY: build-image +build-image: + DOCKER_BUILDKIT=1 docker image build --no-cache \ + -t ${NAME}:${VERSION} \ + . + +.PHONY: push-image +push-image: + docker image tag ${NAME}:${VERSION} $(IMAGE):${VERSION}; \ + docker push $(IMAGE):$(VERSION) diff --git a/README.md b/README.md new file mode 100644 index 0000000..7c5b6e6 --- /dev/null +++ b/README.md @@ -0,0 +1,16 @@ +# KubePulse + +![screenshot](images/screenshot.png) + +KubePulse is a simple, resource efficient cluster test application for Kubernetes. It displays basic information about the node/pod that served the webpage, and also sends the time continuously over a websocket. + +## Installation + +Installation is done via Helm. + +``` +helm repo add kubepulse https://cmdrsharp.github.io/kubepulse +helm install kubepulse kubepulse/kubepulse +``` + +See [values.yaml](charts/kubepulse/values.yaml) for a comprehensive list of values that can be set. Typically, you may want to enable an ingress. The helm chart supports native ingress manifests and optionally allows deploying an Istio VirtualService. diff --git a/set-app-version.sh b/set-app-version.sh new file mode 100644 index 0000000..cbec3d8 --- /dev/null +++ b/set-app-version.sh @@ -0,0 +1,20 @@ +#!/bin/bash + +if [ $# -eq 0 ]; then + read -p "Enter the new version (in semver format): " new_version +else + new_version=$1 +fi + +# Validate the input against semver standard +if ! [[ "$new_version" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then + echo "Invalid semver format. Please enter a version in the format of 'x.y.z'" + exit 1 +fi + +# Update the version in the Cargo.toml file +sed -i "s/^version = \".*\"$/version = \"$new_version\"/" Cargo.toml +sed -i "s/^appVersion: \".*\"$/appVersion: \"$new_version\"/" charts/kubepulse/Chart.yaml +sed -i "s/^version: .*$/version: $new_version/" charts/kubepulse/Chart.yaml + +echo "Version updated to $new_version" diff --git a/src/info.rs b/src/info.rs new file mode 100644 index 0000000..b9cdf10 --- /dev/null +++ b/src/info.rs @@ -0,0 +1,41 @@ +use crate::state::AppState; +use chrono::Utc; +use serde::{Deserialize, Serialize}; + +#[derive(Deserialize, Serialize, Debug, Clone)] +pub struct KubeInfo { + time: String, + node: String, + pod: String, + message: String, + clients: i64, +} + +impl KubeInfo { + /// Construct a new KubeInfo + pub async fn new(state: &AppState) -> Self { + Self { + time: Self::get_time(), + node: Self::get_env_var("KUBERNETES_NODE_NAME", None), + pod: Self::get_env_var("KUBERNETES_POD_NAME", None), + message: Self::get_env_var("KUBEPULSE_MESSAGE", Some("Hello Kubernetes!".to_string())), + clients: state.clients().await, + } + } + + /// Get time in human readable format + fn get_time() -> String { + Utc::now().format("%Y-%m-%d %H:%M:%S").to_string() + } + + /// Get variable from environment + fn get_env_var(var: &str, default: Option) -> String { + let default = default.unwrap_or_else(|| "-".to_string()); + + std::env::var_os(var) + .unwrap_or(default.into()) + .to_str() + .unwrap() + .to_string() + } +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..e995222 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,55 @@ +use clap::{command, Parser}; +use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt}; + +mod info; +mod middleware; +mod router; +mod server; +mod state; +mod template; +mod ws; + +/// KubePulse - Kubernetes cluster test application +#[derive(Parser, Debug, Clone)] +#[command(author, version, about, long_about = None)] +pub struct Args { + /// The port to listen on. + #[arg( + short, + long, + default_value_t = 80, + value_parser = clap::value_parser!(u16).range(1..), + env = "KUBEPULSE_PORT" + )] + port: u16, + + /// The base path to serve behind. + #[arg(short, long, default_value = "/", env = "KUBEPULSE_BASEPATH")] + basepath: String, + + /// Static assets directory + #[arg( + short, + long, + default_value = "/app/assets", + env = "KUBEPULSE_ASSETS_DIR" + )] + assets_dir: String, +} + +#[tokio::main] +async fn main() { + // Parse CLI Args + let args = Args::parse(); + + // Set up tracing + tracing_subscriber::registry() + .with( + tracing_subscriber::EnvFilter::try_from_default_env() + .unwrap_or_else(|_| "kubepulse=info,tower_http=info".into()), + ) + .with(tracing_subscriber::fmt::layer()) + .init(); + + server::serve(args).await; +} diff --git a/src/middleware/mod.rs b/src/middleware/mod.rs new file mode 100644 index 0000000..14dd45a --- /dev/null +++ b/src/middleware/mod.rs @@ -0,0 +1 @@ +pub mod normalize_path; // TODO: Remove once tokio releases version past 0.4.0 diff --git a/src/middleware/normalize_path.rs b/src/middleware/normalize_path.rs new file mode 100644 index 0000000..037273d --- /dev/null +++ b/src/middleware/normalize_path.rs @@ -0,0 +1,84 @@ +use axum::http::{Request, Response, Uri}; +use std::{ + borrow::Cow, + task::{Context, Poll}, +}; +use tower::{Layer, Service}; + +#[derive(Debug, Copy, Clone)] +pub struct NormalizePathLayer {} + +impl NormalizePathLayer { + pub fn trim_trailing_slash() -> Self { + NormalizePathLayer {} + } +} + +impl Layer for NormalizePathLayer { + type Service = NormalizePath; + + fn layer(&self, inner: S) -> Self::Service { + NormalizePath::trim_trailing_slash(inner) + } +} + +#[derive(Debug, Copy, Clone)] +pub struct NormalizePath { + inner: S, +} + +impl NormalizePath { + pub fn trim_trailing_slash(inner: S) -> Self { + Self { inner } + } +} + +impl Service> for NormalizePath +where + S: Service, Response = Response>, +{ + type Response = S::Response; + type Error = S::Error; + type Future = S::Future; + + #[inline] + fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll> { + self.inner.poll_ready(cx) + } + + fn call(&mut self, mut req: Request) -> Self::Future { + normalize_trailing_slash(req.uri_mut()); + self.inner.call(req) + } +} + +fn normalize_trailing_slash(uri: &mut Uri) { + if !uri.path().ends_with('/') { + return; + } + + let new_path = uri.path().trim_end_matches('/'); + + let mut parts = uri.clone().into_parts(); + + let new_path_and_query = if let Some(path_and_query) = &parts.path_and_query { + let new_path = if new_path.is_empty() { "/" } else { new_path }; + + let new_path_and_query = if let Some(query) = path_and_query.query() { + Cow::Owned(format!("{}?{}", new_path, query)) + } else { + new_path.into() + } + .parse() + .unwrap(); + + Some(new_path_and_query) + } else { + None + }; + + parts.path_and_query = new_path_and_query; + if let Ok(new_uri) = Uri::from_parts(parts) { + *uri = new_uri; + } +} diff --git a/src/router.rs b/src/router.rs new file mode 100644 index 0000000..1a7a643 --- /dev/null +++ b/src/router.rs @@ -0,0 +1,92 @@ +use crate::{ + middleware::normalize_path::{NormalizePath, NormalizePathLayer}, + server::socket_handler, + state::AppState, + template::{HtmlTemplate, IndexTemplate}, + Args, +}; +use axum::{ + body::Body, + extract::State, + http::{Request, StatusCode}, + response::IntoResponse, + routing::get, + Router, +}; +use clap::crate_version; +use std::{env::var_os, path::PathBuf, sync::Arc}; +use tower::Layer; +use tower_http::{ + services::ServeDir, + trace::{DefaultMakeSpan, TraceLayer}, +}; + +/// Router setup +pub async fn router(args: Args) -> NormalizePath { + let app_state = Arc::new(AppState::new(args.clone()).await); + let assets_dir = PathBuf::from(args.assets_dir); + + NormalizePathLayer::trim_trailing_slash().layer( + Router::new() + .route(&get_route(&args.basepath, ""), get(index)) + .route(&get_route(&args.basepath, "/health"), get(alive)) + .nest_service( + &get_route(&args.basepath, "/assets"), + get(|request: Request| async { + let service = ServeDir::new(assets_dir); + tower::ServiceExt::oneshot(service, request).await + }), + ) + .route(&get_route(&args.basepath, "/ws"), get(socket_handler)) + .layer( + TraceLayer::new_for_http() + .make_span_with(DefaultMakeSpan::default().include_headers(true)), + ) + .with_state(app_state), + ) +} + +/// Index handler +async fn index(State(app_state): State>) -> impl IntoResponse { + let namespace = var_os("KUBERNETES_NAMESPACE") + .unwrap_or("-".into()) + .to_str() + .unwrap() + .to_string(); + + let version = crate_version!().to_string(); + let asset_path = get_route(&app_state.args().basepath, "/assets") + .trim_start_matches('/') + .to_string(); + + HtmlTemplate(IndexTemplate { + namespace, + version, + asset_path, + }) +} + +/// Aliveness handler +async fn alive() -> impl IntoResponse { + (StatusCode::OK, "OK").into_response() +} + +/// Get normalized route +fn get_route(basepath: &str, path: &str) -> String { + // Normalize basepath + let basepath = if basepath == "/" { + basepath + } else { + basepath.strip_suffix('/').unwrap_or(basepath) + }; + + // Normalize path + let path = if path == "/" { + "" + } else { + path.strip_suffix('/').unwrap_or(path) + }; + + // Combine the paths and strip any double slashes + format!("{}{}", basepath, path).replace("//", "/") +} diff --git a/src/server.rs b/src/server.rs new file mode 100644 index 0000000..97b7cd4 --- /dev/null +++ b/src/server.rs @@ -0,0 +1,78 @@ +use crate::{router::router, state::AppState, ws::websocket, Args}; +use axum::{ + extract::{ConnectInfo, State, WebSocketUpgrade}, + headers, + response::IntoResponse, + ServiceExt, TypedHeader, +}; +use std::{net::SocketAddr, sync::Arc}; +use tokio::signal; + +/// HTTP Server +pub async fn serve(args: Args) { + let addr = SocketAddr::from(([0, 0, 0, 0], args.port)); + let app = router(args.clone()).await; + + tracing::info!("Listening on {}{}", addr, args.basepath); + + axum::Server::bind(&addr) + .serve(app.into_make_service_with_connect_info::()) + .with_graceful_shutdown(hyper_shutdown()) + .await + .expect("Failed to bind to address"); +} + +/// Handler for the inbound HTTP request. This is where we upgrade the connection +/// to a WebSocket connection. +pub async fn socket_handler( + ws: WebSocketUpgrade, + State(state): State>, + user_agent: Option>, + ConnectInfo(addr): ConnectInfo, +) -> impl IntoResponse { + let user_agent = if let Some(TypedHeader(user_agent)) = user_agent { + user_agent.to_string() + } else { + "unknown".to_string() + }; + + // Increase number of clients + state.add_client().await; + + tracing::info!( + "New connection from {} ({}). Total connections: {}", + addr, + user_agent, + state.clients().await, + ); + + // Upgrade connection to websocket + ws.on_upgrade(move |socket| websocket(socket, state, addr)) +} + +// Graceful shutdown handler for Axum/Hyper +async fn hyper_shutdown() { + let ctrl_c = async { + signal::ctrl_c() + .await + .expect("Failed to install CTRL+C signal handler"); + }; + + #[cfg(unix)] + let terminate = async { + signal::unix::signal(signal::unix::SignalKind::terminate()) + .expect("Failed to install SIGTERM signal handler") + .recv() + .await; + }; + + #[cfg(not(unix))] + let terminate = std::future::pending::<()>(); + + tokio::select! { + _ = ctrl_c => tracing::info!("CTRL+C received"), + _ = terminate => tracing::info!("SIGTERM received"), + }; + + tracing::info!("Shutting down"); +} diff --git a/src/state.rs b/src/state.rs new file mode 100644 index 0000000..8bdc0c9 --- /dev/null +++ b/src/state.rs @@ -0,0 +1,39 @@ +use crate::Args; +use std::sync::Mutex; + +pub struct AppState { + clients: Mutex, + args: Args, +} + +impl AppState { + /// Constructs a new AppState + pub async fn new(args: Args) -> Self { + Self { + clients: Mutex::new(0), + args, + } + } + + /// Gets current number of clients + pub async fn clients(&self) -> i64 { + *self.clients.lock().expect("Failed to lock mutex") + } + + /// Adds a client to the state + pub async fn add_client(&self) { + let mut clients = self.clients.lock().expect("Failed to lock mutex"); + *clients += 1; + } + + /// Removes a client from the state + pub async fn drop_client(&self) { + let mut clients = self.clients.lock().expect("Failed to lock mutex"); + *clients -= 1; + } + + /// Getter for args + pub fn args(&self) -> &Args { + &self.args + } +} diff --git a/src/template.rs b/src/template.rs new file mode 100644 index 0000000..640ba2d --- /dev/null +++ b/src/template.rs @@ -0,0 +1,34 @@ +use askama::Template; +use axum::{ + http::StatusCode, + response::{Html, IntoResponse, Response}, +}; + +/// Index template +#[derive(Template)] +#[template(path = "index.html")] +pub struct IndexTemplate { + pub namespace: String, + pub version: String, + pub asset_path: String, +} + +/// Wrapper for Askama templates +pub struct HtmlTemplate(pub T); + +/// Implement IntoResponse for Askama templates +impl IntoResponse for HtmlTemplate +where + T: Template, +{ + fn into_response(self) -> Response { + match self.0.render() { + Ok(html) => Html(html).into_response(), + Err(err) => ( + StatusCode::INTERNAL_SERVER_ERROR, + format!("Failed to render template: {}", err), + ) + .into_response(), + } + } +} diff --git a/src/ws.rs b/src/ws.rs new file mode 100644 index 0000000..9a3e9f4 --- /dev/null +++ b/src/ws.rs @@ -0,0 +1,54 @@ +use crate::info::KubeInfo; +use crate::state::AppState; +use axum::extract::{ws::Message, ws::WebSocket}; +use futures::{SinkExt, StreamExt}; +use serde::{Deserialize, Serialize}; +use std::{fmt::Debug, net::SocketAddr, sync::Arc}; + +#[derive(Deserialize, Serialize, Debug, Clone)] +struct TickInfo { + time: String, + pod: String, + node: String, + clients: u32, +} + +/// Websocket handler / state machine +pub async fn websocket(socket: WebSocket, state: Arc, who: SocketAddr) { + let (mut sender, mut receiver) = socket.split(); + + let send_state = Arc::clone(&state); + + // Send updates to the client every second + let mut send_task = tokio::spawn(async move { + loop { + tracing::debug!("Sending update to client {}", who); + + let info = serde_json::to_string(&KubeInfo::new(&send_state).await).unwrap(); + + if let Err(e) = sender.send(Message::Text(info)).await { + tracing::error!("Failed to send message: {}", e); + } + + tokio::time::sleep(std::time::Duration::from_millis(1000)).await; + } + }); + + // Receive messages from the client + let mut recv_task = tokio::spawn(async move { + while let Some(msg) = receiver.next().await { + tracing::debug!("Received message from {}: {:?}", who, msg); + } + }); + + // If any tasks exit, abort the other + tokio::select! { + _ = (&mut send_task) => recv_task.abort(), + _ = (&mut recv_task) => send_task.abort(), + }; + + tracing::info!("Client {} disconnected", who); + + // Decrease number of clients + state.drop_client().await; +} diff --git a/templates/assets/k8.png b/templates/assets/k8.png new file mode 100644 index 0000000..4a7e43d Binary files /dev/null and b/templates/assets/k8.png differ diff --git a/templates/assets/style.css b/templates/assets/style.css new file mode 100644 index 0000000..9f253df --- /dev/null +++ b/templates/assets/style.css @@ -0,0 +1,29 @@ +body { + background-color: #232323; + padding: 0px; + margin: 0px; + text-align: center; +} + +div.container { + color:#f2f2f2; +} + +.container #kubernetes { + margin: 0 auto; + font-weight: 300; + font-size: 12pt; +} + +.container #kubernetes table { + margin: 10px auto; +} + +.container #kubernetes table th { + text-align: right; + padding-right: 20px; +} + +.container #info table td { + text-align: left; +} diff --git a/templates/index.html b/templates/index.html new file mode 100644 index 0000000..c77ca16 --- /dev/null +++ b/templates/index.html @@ -0,0 +1,110 @@ + + + + KubePulse - Version {{ version }} + + + + + +
+
+ + + + + + + + + + + + + + + + + + + + + + + + + +
Namespace:{{ namespace }}
Pod sent over WebSocket:-
Node sent over WebSocket:-
Time sent over WebSocket:--:--:--
Number of connected clients:0
Message:Hello Kubernetes!
+
+
+ + + +