init: skeleton for dashboard configuration state

Cargo.toml

@@ -7,13 +7,15 @@ license = "Apache-2.0"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+anyhow = "1.0.79"
 async-io = "2.3.1"
-axum = "0.7.4"
+axum = { version = "0.7.4", features = [ "ws" ] }
 clap = { version = "4.4.18", features = ["derive"] }
 maud = { version = "0.26.0", features = ["axum"] }
 prometheus-http-api = "0.2.0"
 serde = { version = "1.0.196", features = ["derive"] }
 serde_json = "1.0.113"
+serde_yaml = "0.9.31"
 smol = "2.0.0"
 smol-axum = "0.1.0"
 smol-macros = "0.1.0"

src/dashboard.rs

@@ -0,0 +1,34 @@
+// Copyright 2021 Jeremy Wall
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+use std::path::Path;
+
+use serde::Deserialize;
+use serde_yaml;
+
+#[derive(Deserialize)]
+pub struct Dashboard {
+    title: String,
+    graphs: Vec<Graph>,
+}
+
+#[derive(Deserialize)]
+pub struct Graph {
+    title: String,
+    query: String,
+}
+
+pub fn read_dashboard_list(path: &Path) -> anyhow::Result<Vec<Dashboard>> {
+    let f = std::fs::File::open(path)?;
+    Ok(serde_yaml::from_reader(f)?)
+}

src/main.rs

@@ -11,15 +11,18 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-use std::io;
 use std::net::TcpListener;
+use std::path::PathBuf;
 use std::sync::Arc;
 
+use anyhow;
 use async_io::Async;
 use axum::{self, routing::*, Router};
 use clap::{self, Parser};
 use smol_macros::main;
 
+mod dashboard;
+mod query;
 mod routes;
 
 #[derive(clap::Parser)]
@@ -27,20 +30,25 @@ mod routes;
 struct Cli {
     #[arg(long)]
     listen: Option<std::net::SocketAddr>,
+    #[arg(long)]
+    config: PathBuf,
 }
 
 main! {
-    async fn main(ex: &Arc<smol_macros::Executor<'_>>) -> io::Result<()> {
+    async fn main(ex: &Arc<smol_macros::Executor<'_>>) -> anyhow::Result<()> {
         let args = Cli::parse();
+        let config = std::sync::Arc::new(dashboard::read_dashboard_list(args.config.as_path())?);
         let router = Router::new()
+            .with_state(config)
             // JSON api endpoints
             .nest("/api", routes::mk_api_routes())
             // HTMX ui component endpoints
             .nest("/ui", routes::mk_ui_routes())
             .route("/", get(routes::index));
-        let socket_addr = args.listen.unwrap_or("127.0.0.1:3000".parse().unwrap());
+        let socket_addr = args.listen.unwrap_or("127.0.0.1:3000".parse()?);
         // TODO(jwall): Take this from clap arguments
-        let listener = Async::<TcpListener>::bind(socket_addr).unwrap();
-        smol_axum::serve(ex.clone(), listener, router).await
+        let listener = Async::<TcpListener>::bind(socket_addr)?;
+        smol_axum::serve(ex.clone(), listener, router).await?;
+        Ok(())
     }
 }

src/query.rs

@@ -0,0 +1,28 @@
+// Copyright 2021 Jeremy Wall
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+use prometheus_http_api::{DataSource, Query};
+
+pub struct QueryConn {
+    source: DataSource,
+    query: Query,
+}
+
+impl QueryConn {
+    pub fn new<S: Into<DataSource>, Q: Into<Query>>(src: S, qry: Q) -> Self {
+        Self {
+            source: src.into(),
+            query: qry.into(),
+        }
+    }
+}

src/routes.rs

@@ -11,10 +11,17 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+use std::sync::Arc;
+
 use maud::{html, Markup};
-use axum::Router;
+use axum::{extract::State, Router};
+
+use crate::dashboard::Dashboard;
+
+type Config = State<Arc<Vec<Dashboard>>>;
 
 pub fn mk_api_routes() -> Router {
+    // Query routes
     Router::new()
 }
 
@@ -22,15 +29,26 @@ pub fn mk_ui_routes() -> Router {
     Router::new()
 }
 
-pub async fn index() -> Markup {
+pub async fn index(State(config): Config) -> Markup {
     html! {
         html {
             head {
                 title { ("Heracles - Prometheus Unshackled") }
             }
             body {
-                ("hello world")
+                (app(State(config.clone())).await)
             }
         }
     }
 }
+
+pub async fn app(State(config): Config) -> Markup {
+    html! {
+        div {
+            // Header menu
+            div { }
+            // dashboard display
+            div { }
+        }
+    }
+}