Decouple core Yaak logic from Tauri (#354)

crates/yaak-grpc/src/transport.rs

@@ -0,0 +1,40 @@
+use crate::error::Result;
+use hyper_rustls::{HttpsConnector, HttpsConnectorBuilder};
+use hyper_util::client::legacy::Client;
+use hyper_util::client::legacy::connect::HttpConnector;
+use hyper_util::rt::TokioExecutor;
+use log::info;
+use tonic::body::BoxBody;
+use yaak_tls::{ClientCertificateConfig, get_tls_config};
+
+// I think ALPN breaks this because we're specifying http2_only
+const WITH_ALPN: bool = false;
+
+pub(crate) fn get_transport(
+    validate_certificates: bool,
+    client_cert: Option<ClientCertificateConfig>,
+) -> Result<Client<HttpsConnector<HttpConnector>, BoxBody>> {
+    let tls_config = get_tls_config(validate_certificates, WITH_ALPN, client_cert.clone())?;
+
+    let mut http = HttpConnector::new();
+    http.enforce_http(false);
+
+    let connector = HttpsConnectorBuilder::new()
+        .with_tls_config(tls_config)
+        .https_or_http()
+        .enable_http2()
+        .build();
+
+    let client = Client::builder(TokioExecutor::new())
+        .pool_max_idle_per_host(0)
+        .http2_only(true)
+        .build(connector);
+
+    info!(
+        "Created gRPC client validate_certs={} client_cert={}",
+        validate_certificates,
+        client_cert.is_some()
+    );
+
+    Ok(client)
+}