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//! A logger that can be easily installed to simplify the sample program. //! Ignore performance for ease of use. //! It only supports writing to files and deleting old log files. //! //! Publish: //! //! (1) `cargo test` //! (2) `cargo run --example example` //! (3) Open auto-generated log file. I check it. //! (4) Remove the log file. //! (5) Version up on Cargo.toml. //! (6) `cargo doc --open` //! (7) Comit to Git-hub. //! (8) `cargo publish --dry-run` //! (9) `cargo publish` #[macro_use] extern crate lazy_static; extern crate chrono; extern crate regex; use chrono::{Date, Duration, Local, TimeZone}; use regex::Regex; use std::cell::RefCell; use std::collections::BTreeMap; use std::fs; use std::fs::{File, OpenOptions}; use std::io::Write; use std::ops::Add; use std::path::Path; use std::process; use std::sync::Mutex; use std::thread; // For multi-platform. Windows, or not. #[cfg(windows)] const NEW_LINE: &'static str = "\r\n"; #[cfg(windows)] const NEW_LINE_SEQUENCE: &'static str = "\\r\\n"; #[cfg(not(windows))] const NEW_LINE: &'static str = "\n"; #[cfg(not(windows))] const NEW_LINE_SEQUENCE: &'static str = "\\n"; /// The higher this level, the more will be omitted. /// /// |<-- Low Level ------------------------- High level -->| /// |<-- High priority ------------------- Low priority -->| /// | Fatal < Error < Warn < Notice < Info < Debug < Trace | pub enum Level { /// If the program cannot continue. #[allow(dead_code)] Fatal, /// I didn't get the expected result, so I'll continue with the other method. Error, /// It will be abnormal soon, but there is no problem and you can ignore it. /// For example: /// * He reported that it took longer to access than expected. /// * Report that capacity is approaching the limit. Warn, /// It must be enabled in the server production environment. /// Record of passing important points correctly. /// We are monitoring that it is working properly. Notice, /// Report highlights. /// Everything that needs to be reported regularly in the production environment. Info, /// It should be in a place with many accidents. /// This level is disabled in production environments. /// Leave it in the source and enable it for troubleshooting. /// Often, this is the production level of a desktop operating environment. Debug, /// Not included in the distribution. /// Remove this level from the source after using it for debugging. /// If you want to find a bug in the program, write a lot. Trace, } impl Level { pub fn number(&self) -> usize { match self { Level::Fatal => 1, Level::Error => 2, Level::Warn => 3, Level::Notice => 4, Level::Info => 5, Level::Debug => 6, Level::Trace => 7, } } } // ``` // # Add one line to Cargo.toml // [dependencies] // lazy_static = "1.0.0" // // // Write the following two lines near the beginning of main.rs // #[macro_use] // extern crate lazy_static; // ``` // // * References // * [How can I use mutable lazy_static?](https://users.rust-lang.org/t/how-can-i-use-mutable-lazy-static/3751/3) lazy_static! { /// Logger grobal variable. pub static ref LOGGER: Mutex<Logger> = Mutex::new(Logger::default()); } // Use the line number in the log. // // Thread local scope variable. // // * References // * [ミュータブルなスレッドローカルデータを thread_local!() マクロと RefCell で実現する](https://qiita.com/tatsuya6502/items/bed3702517b36afbdbca) thread_local!(pub static SEQ: RefCell<u128> = { RefCell::new(1) }); pub struct Table { string_map: BTreeMap<String, String>, } impl Default for Table { fn default() -> Self { Table { string_map: BTreeMap::new(), } } } impl Table { pub fn format_str_value(value: &str) -> String { // Escape the trailing newline at last. let mut body = if value[value.len() - NEW_LINE.len()..] == *NEW_LINE { // Do. format!("{}{}", value.trim_end(), NEW_LINE_SEQUENCE) } else { // Don't. value.to_string() }; // Escape the double quotation. body = body.replace("\"", "\\\""); if 1 < value.lines().count() { // Multi-line string. format!( "\"\"\" {} \"\"\"", body ) } else { // One liner. format!("\"{}\"", body) } } /// Insert string value. pub fn str<'a>(&'a mut self, key: &'a str, value: &'a str) -> &'a mut Self { self.string_map.insert( // Log detail level. key.to_string(), // Message. Table::format_str_value(value).to_string(), ); self } } // Easy to use logging. pub struct Log {} impl Log { /// Check level. pub fn enabled(level: Level) -> bool { if let Ok(logger) = LOGGER.lock() { if logger.enabled(level) { return true; } } false } /// Trace level. No trailing newline. #[allow(dead_code)] pub fn trace(s: &str) { if Log::enabled(Level::Trace) { let mut table = Table::default(); Log::write(s, "Trace", &mut table) } } /// Trace level. There is a trailing newline. #[allow(dead_code)] pub fn traceln(s: &str) { if Log::enabled(Level::Trace) { let mut table = Table::default(); Log::writeln(s, "Trace", &mut table); } } /// Trace level. No trailing newline. Use table. #[allow(dead_code)] pub fn trace_t(s: &str, table: &mut Table) { if Log::enabled(Level::Trace) { Log::write(s, "Trace", table) } } /// Trace level. There is a trailing newline. Use table. #[allow(dead_code)] pub fn traceln_t(s: &str, table: &mut Table) { if Log::enabled(Level::Trace) { Log::writeln(s, "Trace", table); } } /// Debug level. No trailing newline. #[allow(dead_code)] pub fn debug(s: &str) { if Log::enabled(Level::Debug) { let mut table = Table::default(); Log::write(s, "Debug", &mut table) } } /// Debug level. There is a trailing newline. #[allow(dead_code)] pub fn debugln(s: &str) { if Log::enabled(Level::Debug) { let mut table = Table::default(); Log::writeln(s, "Debug", &mut table); } } /// Debug level. No trailing newline. Use table. #[allow(dead_code)] pub fn debug_t(s: &str, table: &mut Table) { if Log::enabled(Level::Debug) { Log::write(s, "Debug", table) } } /// Debug level. There is a trailing newline. Use table. #[allow(dead_code)] pub fn debugln_t(s: &str, table: &mut Table) { if Log::enabled(Level::Debug) { Log::writeln(s, "Debug", table); } } /// Info level. No trailing newline. #[allow(dead_code)] pub fn info(s: &str) { if Log::enabled(Level::Info) { let mut table = Table::default(); Log::write(s, "Info", &mut table) } } /// Info level. There is a trailing newline. #[allow(dead_code)] pub fn infoln(s: &str) { if Log::enabled(Level::Info) { let mut table = Table::default(); Log::writeln(s, "Info", &mut table); } } /// Info level. No trailing newline. Use table. #[allow(dead_code)] pub fn info_t(s: &str, table: &mut Table) { if Log::enabled(Level::Info) { Log::write(s, "Info", table) } } /// Info level. There is a trailing newline. Use table. #[allow(dead_code)] pub fn infoln_t(s: &str, table: &mut Table) { if Log::enabled(Level::Info) { Log::writeln(s, "Info", table); } } /// Notice level. No trailing newline. #[allow(dead_code)] pub fn notice(s: &str) { if Log::enabled(Level::Notice) { let mut table = Table::default(); Log::write(s, "Notice", &mut table) } } /// Notice level. There is a trailing newline. #[allow(dead_code)] pub fn noticeln(s: &str) { if Log::enabled(Level::Notice) { let mut table = Table::default(); Log::writeln(s, "Notice", &mut table); } } /// Notice level. No trailing newline. Use table. #[allow(dead_code)] pub fn notice_t(s: &str, table: &mut Table) { if Log::enabled(Level::Notice) { Log::write(s, "Notice", table) } } /// Notice level. There is a trailing newline. Use table. #[allow(dead_code)] pub fn noticeln_t(s: &str, table: &mut Table) { if Log::enabled(Level::Notice) { Log::writeln(s, "Notice", table); } } /// Warning level. No trailing newline. #[allow(dead_code)] pub fn warn(s: &str) { if Log::enabled(Level::Warn) { let mut table = Table::default(); Log::write(s, "Warn", &mut table) } } /// Warning level. There is a trailing newline. #[allow(dead_code)] pub fn warnln(s: &str) { if Log::enabled(Level::Warn) { let mut table = Table::default(); Log::writeln(s, "Warn", &mut table); } } /// Warning level. No trailing newline. Use table. #[allow(dead_code)] pub fn warn_t(s: &str, table: &mut Table) { if Log::enabled(Level::Warn) { Log::write(s, "Warn", table) } } /// Warning level. There is a trailing newline. Use table. #[allow(dead_code)] pub fn warnln_t(s: &str, table: &mut Table) { if Log::enabled(Level::Warn) { Log::writeln(s, "Warn", table); } } /// Error level. No trailing newline. #[allow(dead_code)] pub fn error(s: &str) { if Log::enabled(Level::Error) { let mut table = Table::default(); Log::write(s, "Error", &mut table) } } /// Error level. There is a trailing newline. #[allow(dead_code)] pub fn errorln(s: &str) { if Log::enabled(Level::Error) { let mut table = Table::default(); Log::writeln(s, "Error", &mut table); } } /// Error level. No trailing newline. Use table. #[allow(dead_code)] pub fn error_t(s: &str, table: &mut Table) { if Log::enabled(Level::Error) { Log::write(s, "Error", table) } } /// Error level. There is a trailing newline. Use table. #[allow(dead_code)] pub fn errorln_t(s: &str, table: &mut Table) { if Log::enabled(Level::Error) { Log::writeln(s, "Error", table); } } /// Fatal level. No trailing newline. /// 'panic!' Pass this as the first argument. #[allow(dead_code)] pub fn fatal(s: &str) -> String { let t = format!("{}", s).to_string(); let mut table = Table::default(); Log::write(&t, "Fatal", &mut table); t } /// Fatal level. There is a trailing newline. /// 'panic!' Pass this as the first argument. #[allow(dead_code)] pub fn fatalln(s: &str) -> String { let t = format!("{}{}", s, NEW_LINE).to_string(); let mut table = Table::default(); Log::write(&t, "Fatal", &mut table); t } /// Fatal level. No trailing newline. /// 'panic!' Pass this as the first argument. #[allow(dead_code)] pub fn fatal_t(s: &str, table: &mut Table) -> String { let t = format!("{}", s).to_string(); Log::write(&t, "Fatal", table); t } /// Fatal level. There is a trailing newline. /// 'panic!' Pass this as the first argument. #[allow(dead_code)] pub fn fatalln_t(s: &str, table: &mut Table) -> String { let t = format!("{}{}", s, NEW_LINE).to_string(); Log::write(&t, "Fatal", table); t } /// Write to a log file. There is a trailing newline. #[allow(dead_code)] fn writeln(s: &str, level: &str, table: &mut Table) { let s = &format!("{}{}", s, NEW_LINE); Log::write(s, level, table); } /// Write to a log file. No trailing newline. #[allow(dead_code)] fn write(s: &str, level: &str, table: &mut Table) { SEQ.with(move |seq| { // Write as TOML. // Table name. let mut toml = format!( // Table name to keep for ordering. // For example, you can parse it easily by writing the table name like a GET query. "[\"Now={}&Pid={}&Thr={:?}&Seq={}\"] ", // If you use ISO8601, It's "%Y-%m-%dT%H:%M:%S%z". However, it does not set the date format. // Make it easier to read. Local::now().format("%Y-%m-%d %H:%M:%S"), // Process ID. process::id(), // Thread ID. However, Note that you are not limited to numbers. thread::current().id(), // Line number. This is to avoid duplication. seq.borrow(), ); toml += &format!( "{} = {} ", level, Table::format_str_value(s).to_string() ) .to_string(); for (k, v) in &table.string_map { toml += &format!( "{} = {} ", k, v ) .to_string(); } toml += " "; *seq.borrow_mut() += 1; if let Ok(mut logger) = LOGGER.lock() { // write_all method required to use 'use std::io::Write;'. if let Err(_why) = logger.current_file().write_all(toml.as_bytes()) { // Nothing is output even if log writing fails. // Submitting a message to the competition can result in fouls. // panic!("couldn't write log. : {}",Error::description(&why)), } } }); } } /// Examples: /// /// All: 'tic-tac-toe-2020-07-11.log.toml' /// Prefix: 'tic-tac-toe' /// StartDate: '-2020-07-11' /// Suffix: '.log' /// Extention: '.toml' /// /// If you don't like the .toml extension, leave the suffix empty and the .log extension. pub struct Logger { /// For example, the short name of your application. file_prefix: String, /// For example, '.log'. To be safe, include a word that clearly states that you can delete the file. file_suffix: String, /// If you don't like the .toml extension, leave the suffix empty and the .log extension. file_extention: String, /// File retention days. Delete the file after day from StartDate. pub retention_days: i64, /// Controll file. log_file: Option<LogFile>, /// Activation. pub level: Level, } impl Default for Logger { fn default() -> Self { let prefix = "default"; let suffix = ".log"; let extention = ".toml"; Logger { file_prefix: prefix.to_string(), file_suffix: suffix.to_string(), file_extention: extention.to_string(), retention_days: 7, log_file: None, level: Level::Trace, } } } impl Logger { /// Check level. /// /// # Examples /// /// ``` /// use casual_logger::{Level, Logger}; /// use std::sync::Mutex; /// /// let mut logger = Logger::default(); /// logger.set_file_name("casual-log-test", ".log", ".toml"); /// if logger.enabled(Level::Trace) { /// assert_eq!(true, true); /// } else { /// assert_eq!(true, false); /// } /// /// logger.level = Level::Debug; /// if logger.enabled(Level::Trace) { /// assert_eq!(true, false); /// } else { /// assert_eq!(true, true); /// } /// ``` pub fn enabled(&self, level: Level) -> bool { if level.number() <= self.level.number() { return true; } false } /// Example: /// /// If 'tic-tac-toe-2020-07-11.log.toml', This is 'tic-tac-toe'. #[allow(dead_code)] pub fn get_file_prefix(&self) -> &str { &self.file_prefix } /// Example: /// /// If 'tic-tac-toe-2020-07-11.log.toml', This is '.log'. #[allow(dead_code)] pub fn get_file_suffix(&self) -> &str { &self.file_suffix } /// Example: /// /// If 'tic-tac-toe-2020-07-11.log.toml', This is '.toml'. #[allow(dead_code)] pub fn get_file_extention(&self) -> &str { &self.file_extention } /// Set name except StartDate. /// /// Examples: /// /// All: 'tic-tac-toe-2020-07-11.log.toml' /// Prefix: 'tic-tac-toe' /// StartDate: '-2020-07-11' /// Suffix: '.log' /// Extention: '.toml' #[allow(dead_code)] pub fn set_file_name(&mut self, prefix: &str, suffix: &str, extention: &str) { self.file_prefix = prefix.to_string(); self.file_suffix = suffix.to_string(); self.file_extention = extention.to_string(); } /// Create new file, or get exists file. fn new_today_file( file_prefix: &str, file_suffix: &str, file_extention: &str, ) -> (Date<Local>, File) { let start_date = Local::today(); let file = OpenOptions::new() .create(true) .append(true) // Example: 'default-2020-07-11.log.toml'. .open(Path::new(&format!( "{}-{}{}{}", file_prefix, start_date.format("%Y-%m-%d"), file_suffix, file_extention ))) .unwrap(); (start_date, file) } /// For log rotation. #[allow(dead_code)] pub fn remove_old_logs(&self) -> usize { // Removed files count. let mut count = 0; // Example: // all = './tic-tac-toe-2020-07-11.log.toml' // prefix = "tic-tac-toe" // now = "-2020-07-11" // suffix = ".log" // extention = ".toml" let re = if let Ok(x) = Regex::new(&format!( "./{}-{}{}{}", self.file_prefix, r"(\d{4})-(\d{2})-(\d{2})", self.file_suffix, self.file_extention )) { x } else { return 0; }; // file, directory paths: let paths = if let Ok(x) = fs::read_dir("./") { x } else { return 0; }; for path in paths { let name = if let Ok(x) = path { x.path().display().to_string() } else { continue; }; // File name pattern match: if let Some(caps) = re.captures(&name) { // Extract year, month, day. let year: i32 = if let Some(cap) = caps.get(1) { if let Ok(n) = cap.as_str().parse() { n } else { 0 } } else { 0 }; let month: u32 = if let Some(cap) = caps.get(2) { if let Ok(n) = cap.as_str().parse() { n } else { 0 } } else { 0 }; let day: u32 = if let Some(cap) = caps.get(3) { if let Ok(n) = cap.as_str().parse() { n } else { 0 } } else { 0 }; if month != 0 && day != 0 { let file_date = Local.ymd(year, month, day); // Over the retention days. if file_date.add(Duration::days(self.retention_days)) < Local::today() { // Remove file. if let Ok(_why) = fs::remove_file(name) { // Nothing is output even if log writing fails. // Submitting a message to the competition can result in fouls. // println!("! {:?}", why.kind()); } else { count += 1; } } } } } count } /// Get file, or rotation file. fn current_file(&mut self) -> &File { // Check day. let date_changed = if let Some(log_file) = &self.log_file { log_file.start_date < Local::today() } else { false }; // Remove file, if day changed. if date_changed { self.log_file = None; } // New file, if file removed or new. if let None = self.log_file { let (start_date, file) = Logger::new_today_file(&self.file_prefix, &self.file_suffix, &self.file_extention); self.log_file = Some(LogFile::new(start_date, file)); } // Return file handle. &self.log_file.as_ref().unwrap().file } } /// Used for editing and locking files. struct LogFile { /// Used for file name and deletion. Year, Month, Day. pub start_date: Date<Local>, /// Used for editing and locking files. pub file: File, } impl LogFile { pub fn new(start_date: Date<Local>, file: File) -> Self { LogFile { start_date: start_date, file: file, } } }