main: add a separate logfile to the logger

src/main.rs

@@ -1,4 +1,4 @@
-use std::sync::Arc;
+use std::sync::{Arc, Mutex};
 
 use async_openai::types::chat::ChatCompletionRequestMessage;
 use serde::{Deserialize, Serialize};
@@ -66,9 +66,9 @@ impl SaveData {
     }
 }
 
-struct SysMessageLogger(Arc<tokio::sync::mpsc::UnboundedSender<String>>);
+struct SysMessageLogger<T>(Arc<tokio::sync::mpsc::UnboundedSender<String>>, Mutex<T>);
 
-impl log::Log for SysMessageLogger {
+impl<T: std::io::Write + Send + Sync> log::Log for SysMessageLogger<T> {
     fn enabled(&self, _metadata: &log::Metadata) -> bool {
         true
     }
@@ -76,7 +76,9 @@ impl log::Log for SysMessageLogger {
     fn flush(&self) {}
 
     fn log(&self, record: &log::Record) {
-        self.0.send(format!("{}", record.args())).unwrap();
+        let msg = format!("{}", record.args());
+        write!(self.1.lock().unwrap(), "{}\n", msg).unwrap();
+        self.0.send(msg).unwrap();
     }
 }
 
@@ -95,10 +97,10 @@ async fn main() {
 
     let (sys_message_sink, sys_message_src) = tokio::sync::mpsc::unbounded_channel();
 
-    static LOGGER: StaticCell<SysMessageLogger> = StaticCell::new();
-    let logger = LOGGER.init(SysMessageLogger(Arc::new(sys_message_sink)));
+    static LOGGER: StaticCell<SysMessageLogger<std::fs::File>> = StaticCell::new();
+    let logger = LOGGER.init(SysMessageLogger(Arc::new(sys_message_sink), Mutex::new(std::fs::File::create("out.log").unwrap())));
     log::set_logger(logger).unwrap();
-    log::set_max_level(log::LevelFilter::Info);
+    log::set_max_level(log::LevelFilter::Debug);
 
     dotenv::dotenv().ok();