chore: logger for idiomatic style and expanded logging levels

Improve the Rust logger by adhering to idiomatic Rust conventions and
incorporating additional logging levels: warn, debug, and trace.

Signed-off-by: TruongSinh Tran-Nguyen <i@truongsinh.pro>

rust-src/Cargo.toml

@@ -9,7 +9,7 @@ crate-type = ["staticlib"]
 
 [dependencies]
 atty = "0.2.14"
-log = "0.4"
+log = { version = "0.4", features = ["std"] }
 chrono = "0.4"
 colored = "2"
 clap = { version = "4.0.32", features = ["derive", "wrap_help"] }

rust-src/bch_bindgen/src/lib.rs

@@ -3,7 +3,6 @@ pub mod btree;
 pub mod bkey;
 pub mod errcode;
 pub mod keyutils;
-pub mod log;
 pub mod rs;
 pub mod fs;
 pub mod opts;

rust-src/bch_bindgen/src/log.rs

@@ -1,57 +0,0 @@
-use std::sync::atomic::{AtomicU8, Ordering};
-
-pub const MUTE: u8 = 0;
-pub const ERROR: u8 = 1;
-pub const INFO: u8 = 2;
-pub const DEBUG: u8 = 3;
-
-// error level by default
-pub static VERBOSE: AtomicU8 = AtomicU8::new(ERROR);
-
-#[inline]
-pub fn set_verbose_level(level: u8) {
-    VERBOSE.store(level, Ordering::SeqCst);
-}
-
-pub fn max_level() -> u8 {
-    VERBOSE.load(Ordering::SeqCst)
-}
-
-#[macro_export]
-macro_rules! info {
-    ($($arg:tt)*) => {
-        if 2 <= $crate::log::max_level() {
-            println!("{} {} {}",
-                " INFO".green(),
-                format!("{}:", module_path!()).bright_black(),
-                format_args!($($arg)*)
-            );
-        }
-    }
-}
-
-#[macro_export]
-macro_rules! debug {
-    ($($arg:tt)*) => {
-        if 3 <= $crate::log::max_level() {
-            println!("{} {} {}",
-                "DEBUG".bright_blue(),
-                format!("{}:", module_path!()).bright_black(),
-                format_args!($($arg)*)
-            );
-        }
-    }
-}
-
-#[macro_export]
-macro_rules! error {
-    ($($arg:tt)*) => {
-        if 1 <= $crate::log::max_level() {
-            println!("{} {} {}",
-                "ERROR".bright_red(),
-                format!("{}:", module_path!()).bright_black(),
-                format_args!($($arg)*)
-            );
-        }
-    }
-}

rust-src/src/cmd_list.rs

@@ -1,5 +1,5 @@
 use atty::Stream;
-use bch_bindgen::error;
+use log::{error};
 use bch_bindgen::bcachefs;
 use bch_bindgen::opt_set;
 use bch_bindgen::fs::Fs;
@@ -9,7 +9,6 @@ use bch_bindgen::btree::BtreeIter;
 use bch_bindgen::btree::BtreeNodeIter;
 use bch_bindgen::btree::BtreeIterFlags;
 use clap::Parser;
-use colored::Colorize;
 use std::ffi::{CStr, OsStr, c_int, c_char};
 use std::os::unix::ffi::OsStrExt;
 

rust-src/src/cmd_mount.rs

@@ -1,11 +1,13 @@
 use atty::Stream;
-use bch_bindgen::{bcachefs, bcachefs::bch_sb_handle, debug, error, info};
+use bch_bindgen::{bcachefs, bcachefs::bch_sb_handle};
+use log::{info, warn, debug, error, trace, LevelFilter};
 use clap::Parser;
-use colored::Colorize;
 use uuid::Uuid;
+use std::convert::TryInto;
 use std::path::PathBuf;
 use crate::key;
 use crate::key::KeyLoc;
+use crate::logger::SimpleLogger;
 use std::ffi::{CStr, CString, OsStr, c_int, c_char, c_void};
 use std::os::unix::ffi::OsStrExt;
 
@@ -202,9 +204,20 @@ pub extern "C" fn cmd_mount(argc: c_int, argv: *const *const c_char) {
         .collect();
 
     let opt = Cli::parse_from(argv);
-    bch_bindgen::log::set_verbose_level(opt.verbose + bch_bindgen::log::ERROR);
+    
+    log::set_boxed_logger(Box::new(SimpleLogger)).unwrap();
+
+    // @TODO : more granular log levels via mount option
+    log::set_max_level(match opt.verbose {
+        0 => LevelFilter::Warn,
+        1 => LevelFilter::Trace,
+        2_u8..=u8::MAX => todo!(),
+    });
+
     colored::control::set_override(opt.colorize);
     if let Err(e) = cmd_mount_inner(opt) {
         error!("Fatal error: {}", e);
+    } else {
+        info!("Successfully mounted");
     }
 }

rust-src/src/key.rs

@@ -1,6 +1,5 @@
-use bch_bindgen::info;
+use log::{info};
 use bch_bindgen::bcachefs::bch_sb_handle;
-use colored::Colorize;
 use crate::c_str;
 use anyhow::anyhow;
 

rust-src/src/lib.rs

@@ -1,4 +1,5 @@
 pub mod key;
+pub mod logger;
 pub mod cmd_mount;
 pub mod cmd_list;
 

rust-src/src/logger.rs

@@ -0,0 +1,28 @@
+use colored::Colorize;
+use log::{Level, Metadata, Record};
+
+pub struct SimpleLogger;
+
+impl log::Log for SimpleLogger {
+    fn enabled(&self, _: &Metadata) -> bool {
+        true
+    }
+
+    fn log(&self, record: &Record) {
+        let debug_prefix = match record.level() {
+            Level::Error => "ERROR".bright_red(),
+            Level::Warn => "WARN".bright_yellow(),
+            Level::Info => "INFO".green(),
+            Level::Debug => "DEBUG".bright_blue(),
+            Level::Trace => "TRACE".into(),
+        };
+        println!(
+            "{} - {}: {}",
+            debug_prefix,
+            record.module_path().unwrap_or_default().bright_black(),
+            record.args()
+        );
+    }
+
+    fn flush(&self) {}
+}