make the panic message more useful (#437)

when panic happend, previouse panic info:
panic occurred: PanicHookInfo { payload: Any { .. }, location: Location { file: "easytier/src/easytier-core.rs", line: 680, col: 9 }, can_unwind: true, force_no_backtrace: false }

the new panic info:

panic occurred: payload:launcher error: "anyhow error: failed to add listener tcp://0.0.0.0:11010", location: Some(Location { file: "easytier/src/easytier-core.rs", line: 680, col: 9 })
backtrace saved to easytier-panic.log

easytier/locales/app.yml

@@ -120,3 +120,8 @@ core_clap:
   ipv6_listener:
     en: "the url of the ipv6 listener, e.g.: tcp://[::]:11010, if not set, will listen on random udp port"
     zh-CN: "IPv6 监听器的URL，例如：tcp://[::]:11010，如果未设置，将在随机UDP端口上监听"
+
+core_app:
+  panic_backtrace_save:
+    en: "backtrace saved to easytier-panic.log"
+    zh-CN: "回溯信息已保存到easytier-panic.log"

easytier/src/easytier-cli.rs

@@ -29,6 +29,8 @@ use easytier::{
     utils::{cost_to_str, float_to_str, PeerRoutePair},
 };
 
+rust_i18n::i18n!("locales", fallback = "en");
+
 #[derive(Parser, Debug)]
 #[command(name = "easytier-cli", author, version = EASYTIER_VERSION, about, long_about = None)]
 struct Cli {

easytier/src/lib.rs

@@ -19,3 +19,4 @@ pub mod web_client;
 mod tests;
 
 pub const VERSION: &str = common::constants::EASYTIER_VERSION;
+rust_i18n::i18n!("locales", fallback = "en");

easytier/src/utils.rs

@@ -128,7 +128,25 @@ pub fn setup_panic_handler() {
     use std::io::Write;
     std::panic::set_hook(Box::new(|info| {
         let backtrace = backtrace::Backtrace::force_capture();
-        println!("panic occurred: {:?}, backtrace: {:#?}", info, backtrace);
+        let payload = info.payload();
+        let payload_str: Option<&str> = if let Some(s) = payload.downcast_ref::<&str>() {
+            Some(s)
+        } else if let Some(s) = payload.downcast_ref::<String>() {
+            Some(s)
+        } else {
+            None
+        };
+
+        if let Some(payload_str) = payload_str {
+            println!(
+                "panic occurred: payload:{}, location: {:?}",
+                payload_str,
+                info.location()
+            );
+        } else {
+            println!("panic occurred: location: {:?}", info.location());
+        }
+        println!("{}", rust_i18n::t!("core_app.panic_backtrace_save"));
         let _ = std::fs::File::create("easytier-panic.log")
             .and_then(|mut f| f.write_all(format!("{:?}\n{:#?}", info, backtrace).as_bytes()));
         std::process::exit(1);