feat: allow logging output to file

src/config.rs

@@ -166,6 +166,13 @@ impl VerifiedUsers {
     }
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[allow(unused)]
+pub struct Logging {
+    pub folder_path: Option<String>,
+    pub file_prefix: Option<String>,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[allow(unused)]
 pub struct Settings {
@@ -180,6 +187,7 @@ pub struct Settings {
     pub verified_users: VerifiedUsers,
     pub retention: Retention,
     pub options: Options,
+    pub logging: Logging,
 }
 
 impl Settings {
@@ -320,6 +328,10 @@ impl Default for Settings {
             options: Options {
                 reject_future_seconds: None, // Reject events in the future if defined
             },
+            logging: Logging {
+                folder_path: None,
+                file_prefix: None,
+            },
         }
     }
 }

src/main.rs

@@ -4,6 +4,8 @@ use console_subscriber::ConsoleLayer;
 use nostr_rs_relay::cli::CLIArgs;
 use nostr_rs_relay::config;
 use nostr_rs_relay::server::start_server;
+use tracing_appender::non_blocking::WorkerGuard;
+use tracing_subscriber::EnvFilter;
 use std::sync::mpsc as syncmpsc;
 use std::sync::mpsc::{Receiver as MpscReceiver, Sender as MpscSender};
 use std::thread;
@@ -22,6 +24,8 @@ fn main() {
     // get config file name from args
     let config_file_arg = args.config;
 
+    let mut _log_guard: Option<WorkerGuard> = None;
+
     // configure settings from the config file (defaults to config.toml)
     // replace default settings with those read from the config file
     let mut settings = config::Settings::new(&config_file_arg);
@@ -32,7 +36,27 @@ fn main() {
         ConsoleLayer::builder().with_default_env().init();
     } else {
         // standard logging
-        tracing_subscriber::fmt::try_init().unwrap();
+        if let Some(path) = &settings.logging.folder_path {
+            // write logs to a folder
+            let prefix = match &settings.logging.file_prefix {
+                Some(p) => p.as_str(),
+                None => "relay",
+            };
+            let file_appender = tracing_appender::rolling::hourly(path, prefix);
+            let (non_blocking, guard) = tracing_appender::non_blocking(file_appender);
+            let filter = EnvFilter::from_default_env();
+            // assign to a variable that is not dropped till the program ends
+            _log_guard = Some(guard);
+            
+            tracing_subscriber::fmt()
+                .with_env_filter(filter)
+                .with_writer(non_blocking)
+                .try_init()
+                .unwrap();
+        } else {
+            // write to stdout
+            tracing_subscriber::fmt::try_init().unwrap();
+        }
     }
     info!("Starting up from main");