1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595
//! A rolling file appender. //! //! Creates a new log file at a fixed frequency as defined by [`Rotation`](struct.Rotation.html). //! Logs will be written to this file for the duration of the period and will automatically roll over //! to the newly created log file once the time period has elapsed. //! //! The log file is created at the specified directory and file name prefix which *may* be appended with //! the date and time. //! //! The following helpers are available for creating a rolling file appender. //! //! - [`Rotation::minutely()`][minutely]: A new log file in the format of `some_directory/log_file_name_prefix.yyyy-MM-dd-HH-mm` //! will be created minutely (once per minute) //! - [`Rotation::hourly()`][hourly]: A new log file in the format of `some_directory/log_file_name_prefix.yyyy-MM-dd-HH` //! will be created hourly //! - [`Rotation::daily()`][daily]: A new log file in the format of `some_directory/log_file_name_prefix.yyyy-MM-dd` //! will be created daily //! - [`Rotation::never()`][never]: This will result in log file located at `some_directory/log_file_name` //! //! [minutely]: fn.minutely.html //! [hourly]: fn.hourly.html //! [daily]: fn.daily.html //! [never]: fn.never.html //! //! # Examples //! //! ```rust //! # fn docs() { //! use tracing_appender::rolling::{RollingFileAppender, Rotation}; //! let file_appender = RollingFileAppender::new(Rotation::HOURLY, "/some/directory", "prefix.log"); //! # } //! ``` use crate::inner::InnerAppender; use chrono::{DateTime, Datelike, TimeZone, Timelike, Utc}; use std::fmt::Debug; use std::io; use std::path::Path; /// A file appender with the ability to rotate log files at a fixed schedule. /// /// `RollingFileAppender` implements [`std:io::Write` trait][write] and will block on write operations. /// It may be used with [`NonBlocking`][non-blocking] to perform writes without /// blocking the current thread. /// /// [write]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html /// [non-blocking]: ../non_blocking/struct.NonBlocking.html /// /// # Examples /// /// ```rust /// # fn docs() { /// let file_appender = tracing_appender::rolling::hourly("/some/directory", "prefix.log"); /// # } /// ``` #[derive(Debug)] pub struct RollingFileAppender { inner: InnerAppender, } impl RollingFileAppender { /// Creates a new `RollingFileAppender`. /// /// A `RollingFileAppender` will have a fixed rotation whose frequency is /// defined by [`Rotation`](struct.Rotation.html). The `directory` and /// `file_name_prefix` arguments determine the location and file name's _prefix_ /// of the log file. `RollingFileAppender` will automatically append the current date /// and hour (UTC format) to the file name. /// /// Alternatively, a `RollingFileAppender` can be constructed using one of the following helpers: /// /// - [`Rotation::minutely()`][minutely], /// - [`Rotation::hourly()`][hourly], /// - [`Rotation::daily()`][daily], /// - [`Rotation::never()`][never] /// /// [minutely]: fn.minutely.html /// [hourly]: fn.hourly.html /// [daily]: fn.daily.html /// [never]: fn.never.html /// /// # Examples /// ```rust /// # fn docs() { /// use tracing_appender::rolling::{RollingFileAppender, Rotation}; /// let file_appender = RollingFileAppender::new(Rotation::HOURLY, "/some/directory", "prefix.log"); /// # } /// ``` pub fn new( rotation: Rotation, directory: impl AsRef<Path>, file_name_prefix: impl AsRef<Path>, ) -> RollingFileAppender { RollingFileAppender { inner: InnerAppender::new( directory.as_ref(), file_name_prefix.as_ref(), rotation, Utc::now(), ) .expect("Failed to create appender"), } } } impl io::Write for RollingFileAppender { fn write(&mut self, buf: &[u8]) -> io::Result<usize> { self.inner.write(buf) } fn flush(&mut self) -> io::Result<()> { self.inner.flush() } } /// Creates a minutely, rolling file appender. This will rotate the log file once per minute. /// /// The appender returned by `rolling::minutely` can be used with `non_blocking` to create /// a non-blocking, minutely file appender. /// /// The directory of the log file is specified with the `directory` argument. /// `file_name_prefix` specifies the _prefix_ of the log file. `RollingFileAppender` /// adds the current date, hour, and minute to the log file in UTC. /// /// # Examples /// /// ``` rust /// # #[clippy::allow(needless_doctest_main)] /// fn main () { /// # fn doc() { /// let appender = tracing_appender::rolling::minutely("/some/path", "rolling.log"); /// let (non_blocking_appender, _guard) = tracing_appender::non_blocking(appender); /// /// let subscriber = tracing_subscriber::fmt().with_writer(non_blocking_appender); /// /// tracing::subscriber::with_default(subscriber.finish(), || { /// tracing::event!(tracing::Level::INFO, "Hello"); /// }); /// # } /// } /// ``` /// /// This will result in a log file located at `/some/path/rolling.log.yyyy-MM-dd-HH-mm`. pub fn minutely( directory: impl AsRef<Path>, file_name_prefix: impl AsRef<Path>, ) -> RollingFileAppender { RollingFileAppender::new(Rotation::MINUTELY, directory, file_name_prefix) } /// Creates an hourly, rolling file appender. /// /// The appender returned by `rolling::hourly` can be used with `non_blocking` to create /// a non-blocking, hourly file appender. /// /// The directory of the log file is specified with the `directory` argument. /// `file_name_prefix` specifies the _prefix_ of the log file. `RollingFileAppender` /// adds the current date and hour to the log file in UTC. /// /// # Examples /// /// ``` rust /// # #[clippy::allow(needless_doctest_main)] /// fn main () { /// # fn doc() { /// let appender = tracing_appender::rolling::hourly("/some/path", "rolling.log"); /// let (non_blocking_appender, _guard) = tracing_appender::non_blocking(appender); /// /// let subscriber = tracing_subscriber::fmt().with_writer(non_blocking_appender); /// /// tracing::subscriber::with_default(subscriber.finish(), || { /// tracing::event!(tracing::Level::INFO, "Hello"); /// }); /// # } /// } /// ``` /// /// This will result in a log file located at `/some/path/rolling.log.yyyy-MM-dd-HH`. pub fn hourly( directory: impl AsRef<Path>, file_name_prefix: impl AsRef<Path>, ) -> RollingFileAppender { RollingFileAppender::new(Rotation::HOURLY, directory, file_name_prefix) } /// Creates a file appender that rotates daily. /// /// The appender returned by `rolling::daily` can be used with `non_blocking` to create /// a non-blocking, daily file appender. /// /// A `RollingFileAppender` has a fixed rotation whose frequency is /// defined by [`Rotation`](struct.Rotation.html). The `directory` and /// `file_name_prefix` arguments determine the location and file name's _prefix_ /// of the log file. `RollingFileAppender` automatically appends the current date in UTC. /// /// # Examples /// /// ``` rust /// # #[clippy::allow(needless_doctest_main)] /// fn main () { /// # fn doc() { /// let appender = tracing_appender::rolling::daily("/some/path", "rolling.log"); /// let (non_blocking_appender, _guard) = tracing_appender::non_blocking(appender); /// /// let subscriber = tracing_subscriber::fmt().with_writer(non_blocking_appender); /// /// tracing::subscriber::with_default(subscriber.finish(), || { /// tracing::event!(tracing::Level::INFO, "Hello"); /// }); /// # } /// } /// ``` /// /// This will result in a log file located at `/some/path/rolling.log.yyyy-MM-dd-HH`. pub fn daily( directory: impl AsRef<Path>, file_name_prefix: impl AsRef<Path>, ) -> RollingFileAppender { RollingFileAppender::new(Rotation::DAILY, directory, file_name_prefix) } /// Creates a non-rolling, file appender /// /// The appender returned by `rolling::never` can be used with `non_blocking` to create /// a non-blocking, non-rotating appender. /// /// The location of the log file will be specified the `directory` passed in. /// `file_name` specifies the prefix of the log file. No date or time is appended. /// /// # Examples /// /// ``` rust /// # #[clippy::allow(needless_doctest_main)] /// fn main () { /// # fn doc() { /// let appender = tracing_appender::rolling::never("/some/path", "non-rolling.log"); /// let (non_blocking_appender, _guard) = tracing_appender::non_blocking(appender); /// /// let subscriber = tracing_subscriber::fmt().with_writer(non_blocking_appender); /// /// tracing::subscriber::with_default(subscriber.finish(), || { /// tracing::event!(tracing::Level::INFO, "Hello"); /// }); /// # } /// } /// ``` /// /// This will result in a log file located at `/some/path/non-rolling.log`. pub fn never(directory: impl AsRef<Path>, file_name: impl AsRef<Path>) -> RollingFileAppender { RollingFileAppender::new(Rotation::NEVER, directory, file_name) } /// Defines a fixed period for rolling of a log file. /// /// To use a `Rotation`, pick one of the following options: /// /// ### Minutely Rotation /// ```rust /// # fn docs() { /// use tracing_appender::rolling::Rotation; /// let rotation = tracing_appender::rolling::Rotation::MINUTELY; /// # } /// ``` /// /// ### Hourly Rotation /// ```rust /// # fn docs() { /// use tracing_appender::rolling::Rotation; /// let rotation = tracing_appender::rolling::Rotation::HOURLY; /// # } /// ``` /// /// ### Daily Rotation /// ```rust /// # fn docs() { /// use tracing_appender::rolling::Rotation; /// let rotation = tracing_appender::rolling::Rotation::DAILY; /// # } /// ``` /// /// ### No Rotation /// ```rust /// # fn docs() { /// use tracing_appender::rolling::Rotation; /// let rotation = tracing_appender::rolling::Rotation::NEVER; /// # } /// ``` #[derive(Clone, Eq, PartialEq, Debug)] pub struct Rotation(RotationKind); #[derive(Clone, Eq, PartialEq, Debug)] enum RotationKind { Minutely, Hourly, Daily, Never, } impl Rotation { /// Provides an minutely rotation pub const MINUTELY: Self = Self(RotationKind::Minutely); /// Provides an hourly rotation pub const HOURLY: Self = Self(RotationKind::Hourly); /// Provides a daily rotation pub const DAILY: Self = Self(RotationKind::Daily); /// Provides a rotation that never rotates. pub const NEVER: Self = Self(RotationKind::Never); pub(crate) fn next_date(&self, current_date: &DateTime<Utc>) -> DateTime<Utc> { let unrounded_next_date = match *self { Rotation::MINUTELY => *current_date + chrono::Duration::minutes(1), Rotation::HOURLY => *current_date + chrono::Duration::hours(1), Rotation::DAILY => *current_date + chrono::Duration::days(1), Rotation::NEVER => Utc.ymd(9999, 1, 1).and_hms(1, 0, 0), }; self.round_date(&unrounded_next_date) } pub(crate) fn round_date(&self, date: &DateTime<Utc>) -> DateTime<Utc> { match *self { Rotation::MINUTELY => Utc.ymd(date.year(), date.month(), date.day()).and_hms( date.hour(), date.minute(), 0, ), Rotation::HOURLY => { Utc.ymd(date.year(), date.month(), date.day()) .and_hms(date.hour(), 0, 0) } Rotation::DAILY => Utc .ymd(date.year(), date.month(), date.day()) .and_hms(0, 0, 0), Rotation::NEVER => { Utc.ymd(date.year(), date.month(), date.day()) .and_hms(date.hour(), 0, 0) } } } pub(crate) fn join_date(&self, filename: &str, date: &DateTime<Utc>) -> String { match *self { Rotation::MINUTELY => format!("{}.{}", filename, date.format("%F-%H-%M")), Rotation::HOURLY => format!("{}.{}", filename, date.format("%F-%H")), Rotation::DAILY => format!("{}.{}", filename, date.format("%F")), Rotation::NEVER => filename.to_string(), } } } #[cfg(test)] mod test { use super::*; use std::fs; use std::io::Write; use tempdir::TempDir; fn find_str_in_log(dir_path: &Path, expected_value: &str) -> bool { let dir_contents = fs::read_dir(dir_path).expect("Failed to read directory"); for entry in dir_contents { let path = entry.expect("Expected dir entry").path(); let result = fs::read_to_string(path).expect("Failed to read file"); if result.as_str() == expected_value { return true; } } false } fn write_to_log(appender: &mut RollingFileAppender, msg: &str) { appender .write_all(msg.as_bytes()) .expect("Failed to write to appender"); appender.flush().expect("Failed to flush!"); } fn test_appender(rotation: Rotation, directory: TempDir, file_prefix: &str) { let mut appender = RollingFileAppender::new(rotation, directory.path(), file_prefix); let expected_value = "Hello"; write_to_log(&mut appender, expected_value); assert!(find_str_in_log(directory.path(), expected_value)); directory .close() .expect("Failed to explicitly close TempDir. TempDir should delete once out of scope.") } #[test] fn write_minutely_log() { test_appender( Rotation::HOURLY, TempDir::new("minutely").expect("Failed to create tempdir"), "minutely.log", ); } #[test] fn write_hourly_log() { test_appender( Rotation::HOURLY, TempDir::new("hourly").expect("Failed to create tempdir"), "hourly.log", ); } #[test] fn write_daily_log() { test_appender( Rotation::DAILY, TempDir::new("daily").expect("Failed to create tempdir"), "daily.log", ); } #[test] fn write_never_log() { test_appender( Rotation::NEVER, TempDir::new("never").expect("Failed to create tempdir"), "never.log", ); } #[test] fn test_next_date_minutely() { let r = Rotation::MINUTELY; let mock_now = Utc.ymd(2020, 2, 1).and_hms(0, 0, 0); let next = r.next_date(&mock_now); assert_eq!(mock_now.with_minute(1).unwrap(), next); let mock_now = Utc.ymd(2020, 2, 1).and_hms(0, 20, 30); let next = r.next_date(&mock_now); assert_eq!( mock_now .with_hour(0) .unwrap() .with_minute(21) .unwrap() .with_second(0) .unwrap(), next ); let mock_now = Utc.ymd(2020, 2, 1).and_hms(0, 59, 0); let next = r.next_date(&mock_now); assert_eq!(mock_now.with_hour(1).unwrap().with_minute(0).unwrap(), next); let mock_now = Utc.ymd(2020, 2, 1).and_hms(23, 59, 0); let next = r.next_date(&mock_now); assert_eq!( mock_now .with_day(2) .unwrap() .with_hour(0) .unwrap() .with_minute(0) .unwrap(), next ); let mock_now = Utc.ymd(2020, 12, 31).and_hms(23, 59, 0); let next = r.next_date(&mock_now); assert_eq!(Utc.ymd(2021, 1, 1).and_hms(0, 0, 0), next); } #[test] fn test_next_date_hourly() { let r = Rotation::HOURLY; let mock_now = Utc.ymd(2020, 2, 1).and_hms(0, 0, 0); let next = r.next_date(&mock_now); assert_eq!(mock_now.with_hour(1).unwrap(), next); let mock_now = Utc.ymd(2020, 2, 1).and_hms(0, 20, 0); let next = r.next_date(&mock_now); assert_eq!(mock_now.with_hour(1).unwrap().with_minute(0).unwrap(), next); let mock_now = Utc.ymd(2020, 2, 1).and_hms(1, 0, 0); let next = r.next_date(&mock_now); assert_eq!(mock_now.with_hour(2).unwrap(), next); let mock_now = Utc.ymd(2020, 2, 1).and_hms(23, 0, 0); let next = r.next_date(&mock_now); assert_eq!(mock_now.with_day(2).unwrap().with_hour(0).unwrap(), next); let mock_now = Utc.ymd(2020, 12, 31).and_hms(23, 0, 0); let next = r.next_date(&mock_now); assert_eq!(Utc.ymd(2021, 1, 1).and_hms(0, 0, 0), next); } #[test] fn test_next_date_daily() { let r = Rotation::DAILY; let mock_now = Utc.ymd(2020, 8, 1).and_hms(0, 0, 0); let next = r.next_date(&mock_now); assert_eq!(mock_now.with_day(2).unwrap().with_hour(0).unwrap(), next); let mock_now = Utc.ymd(2020, 8, 1).and_hms(0, 20, 5); let next = r.next_date(&mock_now); assert_eq!(Utc.ymd(2020, 8, 2).and_hms(0, 0, 0), next); let mock_now = Utc.ymd(2020, 8, 31).and_hms(11, 0, 0); let next = r.next_date(&mock_now); assert_eq!(Utc.ymd(2020, 9, 1).and_hms(0, 0, 0), next); let mock_now = Utc.ymd(2020, 12, 31).and_hms(23, 0, 0); let next = r.next_date(&mock_now); assert_eq!(Utc.ymd(2021, 1, 1).and_hms(0, 0, 0), next); } #[test] fn test_round_date_minutely() { let r = Rotation::MINUTELY; let mock_now = Utc.ymd(2020, 2, 1).and_hms(10, 3, 1); assert_eq!( Utc.ymd(2020, 2, 1).and_hms(10, 3, 0), r.round_date(&mock_now) ); let mock_now = Utc.ymd(2020, 2, 1).and_hms(10, 3, 0); assert_eq!(mock_now, r.round_date(&mock_now)); } #[test] fn test_round_date_hourly() { let r = Rotation::HOURLY; let mock_now = Utc.ymd(2020, 2, 1).and_hms(10, 3, 1); assert_eq!( Utc.ymd(2020, 2, 1).and_hms(10, 0, 0), r.round_date(&mock_now) ); let mock_now = Utc.ymd(2020, 2, 1).and_hms(10, 0, 0); assert_eq!(mock_now, r.round_date(&mock_now)); } #[test] fn test_rotation_path_minutely() { let r = Rotation::MINUTELY; let mock_now = Utc.ymd(2020, 2, 1).and_hms(10, 3, 1); let path = r.join_date("MyApplication.log", &mock_now); assert_eq!("MyApplication.log.2020-02-01-10-03", path); } #[test] fn test_rotation_path_hourly() { let r = Rotation::HOURLY; let mock_now = Utc.ymd(2020, 2, 1).and_hms(10, 3, 1); let path = r.join_date("MyApplication.log", &mock_now); assert_eq!("MyApplication.log.2020-02-01-10", path); } #[test] fn test_rotation_path_daily() { let r = Rotation::DAILY; let mock_now = Utc.ymd(2020, 2, 1).and_hms(10, 3, 1); let path = r.join_date("MyApplication.log", &mock_now); assert_eq!("MyApplication.log.2020-02-01", path); } #[test] fn test_round_date_daily() { let r = Rotation::DAILY; let mock_now = Utc.ymd(2020, 2, 1).and_hms(10, 3, 1); assert_eq!( Utc.ymd(2020, 2, 1).and_hms(0, 0, 0), r.round_date(&mock_now) ); let mock_now = Utc.ymd(2020, 2, 1).and_hms(0, 0, 0); assert_eq!(mock_now, r.round_date(&mock_now)); } #[test] fn test_next_date_never() { let r = Rotation::NEVER; let mock_now = Utc.ymd(2020, 2, 1).and_hms(0, 0, 0); let next = r.next_date(&mock_now); assert_eq!(next, Utc.ymd(9999, 1, 1).and_hms(1, 0, 0)); } #[test] fn test_join_date_never() { let r = Rotation::NEVER; let mock_now = Utc.ymd(2020, 2, 1).and_hms(0, 0, 0); let joined_date = r.join_date("Hello.log", &mock_now); assert_eq!(joined_date, "Hello.log"); } }