init_log once

libs/hbb_common/src/lib.rs

@@ -350,21 +350,23 @@ pub fn is_domain_port_str(id: &str) -> bool {
 }
 
 pub fn init_log(_is_async: bool, _name: &str) -> Option<flexi_logger::LoggerHandle> {
+    static INIT: std::sync::Once = std::sync::Once::new();
+    #[allow(unused_mut)]
+    let mut logger_holder: Option<flexi_logger::LoggerHandle> = None;
+    INIT.call_once(|| {
         #[cfg(debug_assertions)]
         {
             use env_logger::*;
             init_from_env(Env::default().filter_or(DEFAULT_FILTER_ENV, "info"));
-        None
         }
         #[cfg(not(debug_assertions))]
         {
             // https://docs.rs/flexi_logger/latest/flexi_logger/error_info/index.html#write
             // though async logger more efficient, but it also causes more problems, disable it for now
-        let mut logger_holder: Option<flexi_logger::LoggerHandle> = None;
             let mut path = config::Config::log_path();
             #[cfg(target_os = "android")]
             if !config::Config::get_home().exists() {
-            return None;
+                return;
             }
             if !_name.is_empty() {
                 path.push(_name);
@@ -387,8 +389,9 @@ pub fn init_log(_is_async: bool, _name: &str) -> Option<flexi_logger::LoggerHand
                     .start()
                     .ok();
             }
-        logger_holder
         }
+    });
+    logger_holder
 }
 
 #[cfg(test)]