Transfer Panel Details Without an Extra Layer of JSON Encoding (#14)

**Rationale:**

This made it harder to snoop on the traffic in the network monitor because it was encoded as a string.

**Changes:**

- Backend now accepts & provides the panel data as a JSON object rather than as a string
- Backend now supports compression
- Minor improvements to error handling
- Some panel structures were getting saved in the JSON when they weren't supposed to be (now this no longer happens)

Reviewed-on: #14
Co-authored-by: Sergey Savelyev <sergeysav.nn@gmail.com>
Co-committed-by: Sergey Savelyev <sergeysav.nn@gmail.com>

server/src/http/api/panels.rs

@@ -9,7 +9,7 @@ use uuid::Uuid;
 #[derive(Deserialize)]
 struct CreateParam {
     name: String,
-    data: String,
+    data: serde_json::Value,
 }
 
 #[derive(Deserialize)]

server/src/http/mod.rs

@@ -9,7 +9,7 @@ use crate::http::backend::setup_backend;
 use crate::http::websocket::setup_websocket;
 use crate::panels::PanelService;
 use crate::telemetry::management_service::TelemetryManagementService;
-use actix_web::middleware::Logger;
+use actix_web::middleware::{Compress, Logger};
 use actix_web::{web, App, HttpServer};
 use log::info;
 use std::sync::Arc;
@@ -36,6 +36,7 @@ pub async fn setup(
             .service(web::scope("/backend").configure(setup_backend))
             .service(web::scope("/ws").configure(setup_websocket))
             .service(web::scope("/api").configure(setup_api))
+            .wrap(Compress::default())
             .wrap(Logger::default())
     })
     .bind("localhost:8080")?

server/src/panels/mod.rs

@@ -14,10 +14,12 @@ impl PanelService {
         Self { pool }
     }
 
-    pub async fn create(&self, name: &str, data: &str) -> anyhow::Result<Uuid> {
+    pub async fn create(&self, name: &str, data: &serde_json::Value) -> anyhow::Result<Uuid> {
         let id = Uuid::new_v4();
         let id_string = id.to_string();
 
+        let data = serde_json::to_string(data)?;
+
         let mut transaction = self.pool.begin().await?;
 
         let _ = sqlx::query!(

server/src/panels/panel.rs

@@ -12,11 +12,12 @@ pub struct Panel {
     #[sqlx(flatten)]
     #[serde(flatten)]
     pub header: PanelRequired,
-    pub data: String,
+    #[sqlx(json)]
+    pub data: serde_json::Value,
 }
 
 #[derive(Default, Clone, Serialize, Deserialize)]
 pub struct PanelUpdate {
     pub name: Option<String>,
-    pub data: Option<String>,
+    pub data: Option<serde_json::Value>,
 }