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use std::fmt::Write; use std::io::Result; use std::path::Path; use log; use log::info; use syslog; pub enum VerboseLevel { Low, High, } pub fn get_levle_from_int(level: u64) -> VerboseLevel { if level < 2 { VerboseLevel::Low } else { VerboseLevel::High } } enum Kind { Verbose, Log, } pub struct StatusLogger { verbose: Option<LogBuilder>, logger: Option<LogBuilder>, } impl StatusLogger { pub fn new() -> Self { StatusLogger { verbose: None, logger: None, } } pub fn add_verbose(&mut self, level: VerboseLevel) { let tmp = LogBuilder::new(level, Kind::Verbose); self.verbose = Some(tmp); } pub fn add_logger(&mut self, level: VerboseLevel) { let tmp = LogBuilder::new(level, Kind::Log); self.logger = Some(tmp); } pub fn is_used(&mut self) -> bool { if let Some(_) = self.logger { true } else if let Some(_) = self.verbose { true } else { false } } pub fn log_file_remove<P: AsRef<Path>>(&mut self, file: P) -> Result<()> { if let Some(ref mut verb) = self.verbose { verb.log_file_remove(&file)?; } if let Some(ref mut log) = self.logger { log.log_file_remove(&file)?; } Ok(()) } pub fn output_log(&mut self) { if let Some(ref mut verb) = self.verbose { verb.output_log(); } if let Some(ref mut log) = self.logger { log.output_log(); } } pub fn log_statistics(&mut self) { if let Some(ref mut verb) = self.verbose { verb.log_statistics(); verb.output_log(); } if let Some(ref mut log) = self.logger { log.log_statistics(); log.output_log(); } } } struct LogBuilder { total_size: u64, file_count: usize, dir_count: usize, curr_size: u64, is_dir: bool, cache_log: String, level: VerboseLevel, kind: Kind, } impl LogBuilder { fn new(level: VerboseLevel, kind: Kind) -> Self { if let Kind::Log = kind { LogBuilder::init_logger(); } LogBuilder { total_size: 0, file_count: 0, dir_count: 0, curr_size: 0, is_dir: false, level, cache_log: String::new(), kind, } } fn log_file_remove<P: AsRef<Path>>(&mut self, file: P) -> Result<()> { self.inner_log_file_remove(file.as_ref()) } fn inner_log_file_remove(&mut self, file: &Path) -> Result<()> { self.cache_log.clear(); let size = self.update_stat(file)?; let result = match self.level { VerboseLevel::Low => writeln!(&mut self.cache_log, "{:?}", file), VerboseLevel::High => { if file.is_dir() { writeln!(&mut self.cache_log, "Remove Directory: {:?}", file) } else { writeln!( &mut self.cache_log, "Remove File: {:?} - freed {}", file, format_size(size) ) } } }; result.expect("unable to format log message"); Ok(()) } fn output_log(&mut self) { if self.is_dir { self.dir_count += 1; } else { self.file_count += 1; self.total_size += self.curr_size; } match self.kind { Kind::Verbose => print!("{}", self.cache_log), Kind::Log => info!("{}", self.cache_log), } self.cache_log.clear(); self.curr_size = 0; } fn log_statistics(&mut self) { if let VerboseLevel::High = self.level { writeln!(&mut self.cache_log, "Final job statistics:") .expect("unable to format log message"); writeln!( &mut self.cache_log, "{} director{} removed", self.dir_count, if self.dir_count < 2 { "y" } else { "ies" } ) .expect("unable to format log message"); writeln!( &mut self.cache_log, "{} file{} removed", self.file_count, if self.file_count < 2 { "" } else { "s" } ) .expect("unable to format log message"); let tmp = format_size(self.total_size); writeln!(&mut self.cache_log, "{} freed", tmp).expect("unable to format log message"); } } fn update_stat(&mut self, file: &Path) -> Result<u64> { if file.is_dir() { self.curr_size = 0; self.is_dir = true; } else { let meta = file.metadata()?; let size = meta.len(); self.curr_size = size; self.is_dir = false; } Ok(self.curr_size) } fn init_logger() -> bool { let res = syslog::init(syslog::Facility::LOG_USER, log::LevelFilter::Info, None); match res { Ok(()) => true, Err(_) => false, } } } pub fn add_file_remove_log<P: AsRef<Path>>(log: &mut Option<StatusLogger>, path: P) -> Result<()> { if let Some(log) = log { log.log_file_remove(path) } else { Ok(()) } } pub fn output_file_remove_log(log: &mut Option<StatusLogger>) { if let Some(log) = log { log.output_log(); } } fn format_size(size: u64) -> String { let sizes = ["", "k", "M", "G", "T", "P", "E", "Z"]; let mut size: f64 = size as f64; let mut count = 0; while count < sizes.len() - 1 && size > 1000.0 { size /= 1000.0; count += 1; } format!("{:.2} {}b", size, sizes[count]) } #[cfg(test)] mod test { use super::*; use std::fs::create_dir; use std::fs::File; use std::io::Write; use tempfile::TempDir; #[test] fn test_size_conveter() { let total_size = 1234; assert_eq!(format_size(total_size), "1.23 kb"); let total_size = 1234567; assert_eq!(format_size(total_size), "1.23 Mb"); } #[test] fn test_log_formatter() { let base_dir = TempDir::new().unwrap(); let dir_path = base_dir.path().join("some_dir"); create_dir(&dir_path).unwrap(); let file_path = base_dir.path().join("file.dat"); let mut large_file = File::create(&file_path).unwrap(); for _ in 0..1000 { large_file.write(&[1, 2, 3, 4, 5]).unwrap(); } let mut log = LogBuilder::new(VerboseLevel::Low, Kind::Verbose); log.log_file_remove(&file_path).unwrap(); assert_eq!(log.cache_log, format!("{:?}\n", file_path)); log.output_log(); assert_eq!(log.cache_log, ""); log.log_file_remove(&dir_path).unwrap(); assert_eq!(log.cache_log, format!("{:?}\n", dir_path)); log.output_log(); assert_eq!(log.cache_log, ""); let mut log = LogBuilder::new(VerboseLevel::High, Kind::Verbose); log.log_file_remove(&file_path).unwrap(); assert_eq!( log.cache_log, format!("Remove File: {:?} - freed 5.00 kb\n", file_path) ); assert_eq!(log.curr_size, 5000); assert_eq!(log.total_size, 0); log.output_log(); assert_eq!(log.cache_log, ""); assert_eq!(log.total_size, 5000); assert_eq!(log.curr_size, 0); log.log_file_remove(&dir_path).unwrap(); assert_eq!(log.cache_log, format!("Remove Directory: {:?}\n", dir_path)); log.output_log(); assert_eq!(log.cache_log, ""); } }