feat(api): init rust rewrite

lib/libpk/src/lib.rs

@@ -0,0 +1,27 @@
+use gethostname::gethostname;
+use tracing_subscriber::{prelude::__tracing_subscriber_SubscriberExt, EnvFilter, Registry};
+
+mod _config;
+pub use crate::_config::CONFIG as config;
+
+pub fn init_logging(component: &str) -> anyhow::Result<()> {
+    let subscriber = Registry::default()
+        .with(EnvFilter::from_default_env())
+        .with(tracing_subscriber::fmt::layer());
+
+    if let Some(gelf_url) = &config.gelf_log_url {
+        let gelf_logger = tracing_gelf::Logger::builder()
+            .additional_field("component", component)
+            .additional_field("hostname", gethostname().to_str());
+        let mut conn_handle = gelf_logger
+            .init_udp_with_subscriber(gelf_url, subscriber)
+            .unwrap();
+        tokio::spawn(async move { conn_handle.connect().await });
+    } else {
+        // gelf_logger internally sets the global subscriber
+        tracing::subscriber::set_global_default(subscriber)
+            .expect("unable to set global subscriber");
+    }
+
+    Ok(())
+}