support ohos (#974)

* support ohos

---------

Co-authored-by: FrankHan <2777926911@qq.com>

easytier-contrib/easytier-ohrs/src/native_log.rs

@@ -0,0 +1,98 @@
+use std::collections::HashMap;
+use std::panic;
+use napi_derive_ohos::napi;
+use ohos_hilog_binding::{hilog_debug, hilog_error, hilog_info, hilog_warn, set_global_options, LogOptions};
+use tracing::{Event, Subscriber};
+use tracing_core::Level;
+use tracing_subscriber::layer::{Context, Layer};
+use tracing_subscriber::prelude::*;
+
+static INITIALIZED: std::sync::Once = std::sync::Once::new();
+fn panic_hook(info: &panic::PanicHookInfo) {
+    hilog_error!("RUST PANIC: {}", info);
+}
+
+#[napi]
+pub fn init_panic_hook() {
+    INITIALIZED.call_once(|| {
+        panic::set_hook(Box::new(panic_hook));
+    });
+}
+
+#[napi]
+pub fn hilog_global_options(
+    domain: u32,
+    tag: String,
+) {
+    ohos_hilog_binding::forward_stdio_to_hilog();
+    set_global_options(LogOptions{
+        domain,
+        tag: Box::leak(tag.clone().into_boxed_str()),
+    })
+}
+
+#[napi]
+pub fn init_tracing_subscriber() {
+    tracing_subscriber::registry()
+        .with(
+            CallbackLayer {
+                callback: Box::new(tracing_callback),
+            }
+        )
+        .init();
+}
+
+fn tracing_callback(event: &Event, fields: HashMap<String, String>) {
+    let metadata = event.metadata();
+    #[cfg(target_env = "ohos")]
+    {
+        let loc = metadata.target().split("::").last().unwrap();
+        match *metadata.level() {
+            Level::TRACE => {
+                hilog_debug!("[{}] {:?}", loc, fields.values().collect::<Vec<_>>());
+            }
+            Level::DEBUG => {
+                hilog_debug!("[{}] {:?}", loc, fields.values().collect::<Vec<_>>());
+            }
+            Level::INFO => {
+                hilog_info!("[{}] {:?}", loc, fields.values().collect::<Vec<_>>());
+            }
+            Level::WARN => {
+                hilog_warn!("[{}] {:?}", loc, fields.values().collect::<Vec<_>>());
+            }
+            Level::ERROR => {
+                hilog_error!("[{}] {:?}", loc, fields.values().collect::<Vec<_>>());
+            }
+        }
+    }
+}
+
+struct CallbackLayer {
+    callback: Box<dyn Fn(&Event, HashMap<String, String>) + Send + Sync>,
+}
+
+impl<S: Subscriber> Layer<S> for CallbackLayer {
+    fn on_event(&self, event: &Event, _ctx: Context<S>) {
+        // 使用 fmt::format::FmtSpan 提取字段值
+        let mut fields = HashMap::new();
+        let mut visitor = FieldCollector(&mut fields);
+        event.record(&mut visitor);
+        (self.callback)(event, fields);
+    }
+}
+
+struct FieldCollector<'a>(&'a mut HashMap<String, String>);
+
+impl<'a> tracing::field::Visit for FieldCollector<'a> {
+    fn record_i64(&mut self, field: &tracing::field::Field, value: i64) {
+        self.0.insert(field.name().to_string(), value.to_string());
+    }
+
+    fn record_str(&mut self, field: &tracing::field::Field, value: &str) {
+        self.0.insert(field.name().to_string(), value.to_string());
+    }
+
+    fn record_debug(&mut self, field: &tracing::field::Field, value: &dyn std::fmt::Debug) {
+        self.0.insert(field.name().to_string(), format!("{:?}", value));
+    }
+}