Implement read

Signed-off-by: Frank Villaro-Dixon <frank@villaro-dixon.eu>

example-cfg.yml

@@ -1,11 +1,16 @@
 clients:
+  # Exclusive writers
   - name: pyranometer
-    metrics:
+    write_metrics:
     - irradiance
     - temperature
+    read_metrics:
+    - weather.*
     auth:
       type: sha256
       hash: ca978112ca1bbdcafac231b39a23dc4da786eff8147c4e72b9807785afee48bb # a
+
+  # Reader and writer on the same metric
   - name: tgbt
     metrics:
     - testproxy.*
@@ -13,9 +18,25 @@ clients:
       type: sha256
       hash: ac790471b321143716e7773d589af923236ebdd435ba17c671df3558becc5154 # 7a5becc5b5bb581522fd0bb8891bb99a70275620
 
+  # Reader and writer on different metrics
+  - name: tgbt
+    write_metrics:
+    - barfoo
+    read_metrics:
+    - foobar.*
+    auth:
+      # ...
+
+  # Reader only
+  - name: consumer
+    read_metrics:
+    - irradiance
+    auth:
+      # ...
+
 
 config:
   opentsdb:
-    url: http://opentsdb/api/
+    url: http://192.168.30.2/api/
   server:
     port: 8080

src/config.rs

@@ -15,8 +15,13 @@ pub struct Config {
 #[derive(Debug, Deserialize, Clone)]
 pub struct Client {
     pub name: String,
+    #[serde(default)]
     pub metrics: Vec<String>,
-    pub auth: Auth,
+    #[serde(default)]
+    pub read_metrics: Vec<String>,
+    #[serde(default)]
+    pub write_metrics: Vec<String>,
+    pub auth: Option<Auth>,
 }
 
 impl Client {
@@ -26,6 +31,24 @@ impl Client {
                 return true;
             }
         }
+        for m in &self.write_metrics {
+            if glob_match(m, metric) {
+                return true;
+            }
+        }
+        false
+    }
+    pub fn can_read(&self, metric: &str) -> bool {
+        for m in &self.metrics {
+            if glob_match(m, metric) {
+                return true;
+            }
+        }
+        for m in &self.read_metrics {
+            if glob_match(m, metric) {
+                return true;
+            }
+        }
         false
     }
 }
@@ -44,7 +67,7 @@ impl Auth {
                 let mut hasher = Sha256::new();
                 hasher.update(token);
                 let result = hasher.finalize();
-                return format!("{:x}", result) == self.hash;
+                format!("{:x}", result) == self.hash
             }
             _ => false,
         }
@@ -81,7 +104,7 @@ fn default_opentsdb_url() -> String {
 
 pub fn load_config_file(filename: &str) -> Config {
     let yaml_content = fs::read_to_string(filename)
-        .expect(format!("Unable to read config file {}", filename).as_str());
+        .unwrap_or_else(|_| panic!("Unable to read config file `{}`", filename));
     let config: Config = serde_yaml::from_str(&yaml_content).expect("Unable to parse YAML");
     config
 }
@@ -89,5 +112,5 @@ pub fn load_config_file(filename: &str) -> Config {
 pub fn try_authenticate_client<'a>(clients: &'a [Client], token: &str) -> Option<&'a Client> {
     clients
         .iter()
-        .find(|client| client.auth.is_valid_token(token))
+        .find(|client| client.auth.is_some() && client.auth.as_ref().unwrap().is_valid_token(token))
 }

src/main.rs

@@ -1,7 +1,7 @@
 use actix_web::http::StatusCode;
 use actix_web::middleware::Logger;
-use actix_web::{error, web, App, HttpResponse, HttpServer, Responder};
-use log::{debug, error, info, log_enabled, Level};
+use actix_web::{web, App, HttpResponse, HttpServer, Responder};
+use log::{debug, error, info};
 use reqwest::Client;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
@@ -16,33 +16,62 @@ struct ClientData {
 }
 
 #[derive(Debug, Deserialize)]
-struct QSParams {
+struct QPutParams {
     token: String,
 }
 
+#[derive(Debug, Deserialize, Serialize)]
+struct OtsdbPutData {
+    metric: String,
+    value: StringIntFloat,
+    timestamp: i64,
+    tags: HashMap<String, StringIntFloat>,
+}
+
+#[derive(Debug, Deserialize)]
+struct QQueryParams {
+    #[serde(default)]
+    token: String,
+
+    #[serde(flatten)]
+    q: OpentsdbQuery,
+}
+
+#[derive(Debug, Deserialize, Serialize)]
+struct OpentsdbQuery {
+    start: StringInt,
+    end: Option<StringInt>,
+    m: String,
+}
+
 #[derive(Debug, Deserialize, Serialize)]
 #[serde(untagged)]
-enum OtsdbValue {
+enum StringIntFloat {
     String(String),
     Integer(i64),
     Float(f64),
 }
 
 #[derive(Debug, Deserialize, Serialize)]
-struct OtsdbData {
-    metric: String,
-    value: OtsdbValue,
-    timestamp: i64,
-    tags: HashMap<String, OtsdbValue>,
+#[serde(untagged)]
+enum StringInt {
+    String(String),
+    Integer(i64),
 }
 
 const CONFIG_FILE: &str = "config.yaml";
 
+fn get_metric(m: &String) -> String {
+    let mut metric = m.clone();
+    let pts: Vec<&str> = metric.split(":").collect();
+    pts[1].to_string()
+}
+
 #[actix_web::post("/put")]
 async fn put_post(
     shared: web::Data<ClientData>,
-    qs: web::Query<QSParams>,
-    body: web::Json<OtsdbData>,
+    qs: web::Query<QPutParams>,
+    body: web::Json<OtsdbPutData>,
 ) -> impl Responder {
     let authenticated_client = config::try_authenticate_client(&shared.cfg.clients, &qs.token);
 
@@ -59,12 +88,13 @@ async fn put_post(
 
     if !client.can_write(&body.metric) {
         let emsg = format!(
-            "Not allowed to write metric `{}`. Allowed metrics: {}",
+            "Not allowed to write metric `{}`. Allowed metrics: {} and {}",
             body.metric,
-            client.metrics.join(", ")
+            client.metrics.join(", "),
+            client.write_metrics.join(", ") // XXX make it nicer
         );
         error!("{}", emsg);
-        return HttpResponse::Forbidden().body(format!("{}", emsg));
+        return HttpResponse::Forbidden().body(emsg);
     }
 
     let post_url = format!("{}put", shared.cfg.config.opentsdb.url);
@@ -101,6 +131,57 @@ async fn put_post(
     }
 }
 
+#[actix_web::get("/query")]
+async fn query_get(shared: web::Data<ClientData>, qs: web::Query<QQueryParams>) -> impl Responder {
+    let authenticated_client = config::try_authenticate_client(&shared.cfg.clients, &qs.token);
+
+    if authenticated_client.is_none() {
+        let emsg = format!(
+            "Unauthorized. Unknown token: {}. Please specify a valid tokne.",
+            qs.token
+        );
+        error!("{}", emsg);
+        return HttpResponse::Unauthorized().body(emsg);
+    }
+
+    let client = authenticated_client.unwrap();
+
+    println!("Query get: {:?}", qs);
+    let metric = get_metric(&qs.q.m);
+
+    if !client.can_read(&metric) {
+        let emsg = format!("Not allowed to read metric `{}`", metric);
+        error!("{}", emsg);
+        return HttpResponse::Forbidden().body(emsg);
+    }
+
+    let get_url = format!("{}query", shared.cfg.config.opentsdb.url);
+    //let otsdb_body = serde_json::to_string(&body).unwrap();
+    //let query_string
+
+    info!("{} get metric {}", client.name, metric);
+    debug!("GET {} with qs: {:?}", get_url, qs.q);
+
+    let response = shared.web_client.get(get_url).query(&qs.q).send().await;
+
+    match response {
+        Ok(resp) => {
+            let status = resp.status();
+
+            let body = resp.text().await.unwrap_or_else(|_| "".to_string());
+            debug!("OpenTSDB response {}: {}", status, body);
+            let sstatus =
+                StatusCode::from_u16(status.as_u16()).unwrap_or(StatusCode::INTERNAL_SERVER_ERROR);
+
+            HttpResponse::Ok().status(sstatus).body(body)
+        }
+        Err(err) => {
+            error!("OpenTSDB error: {}", err);
+            HttpResponse::InternalServerError().body(format!("Proxy error: {}", err))
+        }
+    }
+}
+
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
     let cfg_file = env::var("CONFIG_FILE").unwrap_or(CONFIG_FILE.to_string());
@@ -113,10 +194,7 @@ async fn main() -> std::io::Result<()> {
 
     let web_client = Client::new();
 
-    let shared = ClientData {
-        web_client: web_client,
-        cfg: cfg,
-    };
+    let shared = ClientData { web_client, cfg };
     let client_data = web::Data::new(shared);
 
     HttpServer::new(move || {
@@ -125,6 +203,7 @@ async fn main() -> std::io::Result<()> {
             .app_data(web::JsonConfig::default().content_type_required(false))
             .wrap(Logger::new("%r %s")) // k8s already logs timestamp
             .service(put_post)
+            .service(query_get)
     })
     .bind(format!("[::]:{}", server_port))?
     .run()