Decouple core Yaak logic from Tauri (#354)

crates/yaak-http/src/manager.rs

@@ -0,0 +1,40 @@
+use crate::client::HttpConnectionOptions;
+use crate::error::Result;
+use log::info;
+use reqwest::Client;
+use std::collections::BTreeMap;
+use std::sync::Arc;
+use std::time::{Duration, Instant};
+use tokio::sync::RwLock;
+
+pub struct HttpConnectionManager {
+    connections: Arc<RwLock<BTreeMap<String, (Client, Instant)>>>,
+    ttl: Duration,
+}
+
+impl HttpConnectionManager {
+    pub fn new() -> Self {
+        Self {
+            connections: Arc::new(RwLock::new(BTreeMap::new())),
+            ttl: Duration::from_secs(10 * 60),
+        }
+    }
+
+    pub async fn get_client(&self, opt: &HttpConnectionOptions) -> Result<Client> {
+        let mut connections = self.connections.write().await;
+        let id = opt.id.clone();
+
+        // Clean old connections
+        connections.retain(|_, (_, last_used)| last_used.elapsed() <= self.ttl);
+
+        if let Some((c, last_used)) = connections.get_mut(&id) {
+            info!("Re-using HTTP client {id}");
+            *last_used = Instant::now();
+            return Ok(c.clone());
+        }
+
+        let c = opt.build_client()?;
+        connections.insert(id.into(), (c.clone(), Instant::now()));
+        Ok(c)
+    }
+}