Make options configurable

src/main.rs

@@ -1,5 +1,5 @@
 use axum::{
-    extract::Query,
+    extract::{State, Query},
     http::StatusCode,
     response::{IntoResponse, Response},
     routing::get,
@@ -10,13 +10,54 @@ use std::collections::HashMap;
 use std::net::SocketAddr;
 use std::str::FromStr;
 
-#[derive(PartialEq)]
+#[derive(Clone, PartialEq)]
 enum OperationMode {
     None,
     Exporter,
     Validator,
 }
 
+#[derive(Clone)]
+struct AppState {
+    listen: String,
+    operationmode: OperationMode,
+    prometheus_url: String,
+    prometheus_query_tag_template: String,
+    hydra_url: String,
+    hydra_job_template: String,
+}
+
+impl AppState{
+    pub fn new() -> Self {
+        Self {
+            listen: String::from("[::]:9152"),
+            operationmode: OperationMode::None,
+            prometheus_url: String::from(""),
+            prometheus_query_tag_template: String::from("instance=\"{}\""),
+            hydra_url: String::from(""),
+            hydra_job_template: String::from("nixfiles/nixfiles/nixosConfigurations.{}"),
+        }
+    }
+
+    pub fn is_valid(self) -> bool {
+        let mut valid = true;
+        if self.operationmode == OperationMode::None {
+            println!("operationmode is not set");
+            valid = false;
+        }
+        if self.prometheus_url == String::from("") {
+            println!("Prometheus url is not specified");
+            valid = false;
+        }
+        if self.hydra_url == String::from("") {
+            println!("Hydra url is not specified");
+            valid = false;
+        }
+
+        return valid;
+    }
+}
+
 fn parse_nix_store_path(path: std::path::PathBuf) -> Result<(String, String), String> {
     let (hash, name) = path.file_name()
         .ok_or_else(String::default)?
@@ -27,10 +68,11 @@ fn parse_nix_store_path(path: std::path::PathBuf) -> Result<(String, String), St
     return Ok((hash.to_string(), name.to_string()));
 }
 
+
 #[tokio::main]
 async fn main() {
-    let mut listen = String::from("[::]:9152");
-    let mut operationmode = OperationMode::None;
+    let mut app_state = AppState::new();
+
     let mut args = std::env::args();
     let name = args.next().unwrap();
     loop {
@@ -48,13 +90,25 @@ async fn main() {
                 std::process::exit(0);
             }
             "--listen" => {
-                listen = args.next().unwrap();
+                app_state.listen = args.next().unwrap();
+            }
+            "--prometheus-url" => {
+                app_state.prometheus_url = args.next().unwrap();
+            }
+            "--prometheus-query-tag-template" => {
+                app_state.prometheus_query_tag_template = args.next().unwrap();
+            }
+            "--hydra-url" => {
+                app_state.hydra_url = args.next().unwrap();
+            }
+            "--hydra-job-template" => {
+                app_state.hydra_job_template = args.next().unwrap();
             }
             "exporter" => {
-                operationmode = OperationMode::Exporter;
+                app_state.operationmode = OperationMode::Exporter;
             }
             "validator" => {
-                operationmode = OperationMode::Validator;
+                app_state.operationmode = OperationMode::Validator;
             }
             unknown => {
                 println!("unknown option: {}", unknown);
@@ -63,11 +117,15 @@ async fn main() {
         }
     }
 
+    if !app_state.clone().is_valid() {
+        std::process::exit(1);
+    }
+
     let mut app = Router::new();
-    if operationmode == OperationMode::Exporter {
+    if app_state.operationmode == OperationMode::Exporter {
         println!("Running NixOS Exporter in Exporter mode");
         app = app.route("/metrics", get(metrics));
-    } else if operationmode == OperationMode::Validator {
+    } else if app_state.operationmode == OperationMode::Validator {
         println!("Running NixOS Exporter in Validator mode");
         app = app.route("/metrics", get(check));
     } else {
@@ -75,7 +133,9 @@ async fn main() {
         std::process::exit(1);
     };
 
-    let addr = SocketAddr::from_str(&listen).unwrap();
+    let app = app.with_state(app_state.clone());
+
+    let addr = SocketAddr::from_str(&app_state.listen.clone()).unwrap();
     println!("listening on http://{}", addr);
     axum::Server::bind(&addr)
         .serve(app.into_make_service())
@@ -110,7 +170,7 @@ async fn metrics() -> Response {
     ).into_response()
 }
 
-async fn check(Query(params): Query<HashMap<String, String>>) -> Response {
+async fn check(State(app_state): State<AppState>, Query(params): Query<HashMap<String, String>>) -> Response {
     let target = match params.get("target") {
         Some(target) => target,
         None => {
@@ -118,9 +178,13 @@ async fn check(Query(params): Query<HashMap<String, String>>) -> Response {
         },
     };
 
+    if target.contains("\"") {
+        return (StatusCode::INTERNAL_SERVER_ERROR, "Invalid target name").into_response();
+    }
+
     let client = reqwest::Client::new();
 
-    let prometheus_req = match client.get(format!("https://prometheus.monitoring.clerie.de/api/v1/query?query=nixos_nixos_current_system_hash{{job=%22nixos-exporter%22,instance=%22{}.mon.clerie.de:9152%22}}", target))
+    let prometheus_req = match client.get(format!("{}/api/v1/query?query=nixos_nixos_current_system_hash{{{}}}", app_state.prometheus_url, app_state.prometheus_query_tag_template.clone().replace("{}", target)))
         .header("Accept", "application/json")
         .send().await {
             Ok(req) => req,
@@ -151,7 +215,7 @@ async fn check(Query(params): Query<HashMap<String, String>>) -> Response {
         },
     };
 
-    let hydra_req = match client.get(format!("https://hydra.clerie.de/job/nixfiles/nixfiles/nixosConfigurations.{}/latest", target))
+    let hydra_req = match client.get(format!("{}/job/{}/latest", app_state.hydra_url, app_state.hydra_job_template.clone().replace("{}", target)))
         .header("Accept", "application/json")
         .send().await {
             Ok(req) => req,
@@ -196,6 +260,6 @@ async fn check(Query(params): Query<HashMap<String, String>>) -> Response {
 
     return (
         StatusCode::OK,
-        format!("nixos_current_system_valid{{target=\"{}.net.clerie.de:9152\"}} {}\n", target, status)
+        format!("nixos_current_system_valid{{{}}} {}\n", app_state.prometheus_query_tag_template.clone().replace("{}", target), status)
     ).into_response();
 }