467 lines
191 KiB
Plaintext
467 lines
191 KiB
Plaintext
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~‚ƒ—˜™šœž §©ÒÙ»¨÷–µ×ïðôõÀ â ”| ¬ Ä,º| ’ Ä Ô FromStrÁ<Ï| ïy ‹ â| ‹ × ç| ¤, í ì| ë Û ,™ ç \²k ù lâr
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\ö} „Ä ®Dƒ~ ¼À Ï ª Ó Õ$º4 Õ ×$ÕA Ö ™,ÁM × é,Š[ Ø üÓ�€ üÓ! A lightweight logging facade.Á õ ú üùI F The `log` crate provides a single logging API that abstracts over theÁ üÃM J actual logging implementation. Libraries can use the logging API providedÁ ü‘M J by this crate, and the consumer of those libraries can choose the loggingÁ üß: 7 implementation that is most suitable for its use case.Á š ú üžO L If no logging implementation is selected, the facade falls back to a "noop"Á üîK H implementation that ignores all log messages. The overhead in this caseÁ üº> ; is very small - just an integer load, comparison and jump.Á ù ú üýP M A log request consists of a _target_, a _level_, and a _body_. A target is aÁ üÎP M string which defaults to the module path of the location of the log request,Á üŸ O L though that default may be overridden. Logger implementations typically useÁ üï C @ the target to filter requests based on some user configuration.Á ³
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# UsageÁ Ã
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R O The basic use of the log crate is through the five logging macros: [`error!`],Á üš 3 0 [`warn!`], [`info!`], [`debug!`] and [`trace!`]Á üÎ ? < where `error!` represents the highest-priority log messagesÁ üŽ I F and `trace!` the lowest. The log messages are filtered by configuringÁ üØ < 9 the log level to exclude messages with a lower priority.Á ü•
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I F Each of these macros accept format strings similarly to [`println!`].Á ß
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" [`error!`]: ./macro.error.htmlÁ üŠ [`warn!`]: ./macro.warn.htmlÁ ü« [`info!`]: ./macro.info.htmlÁ üÌ" [`debug!`]: ./macro.debug.htmlÁ üï" [`trace!`]: ./macro.trace.htmlÁ ü’I F [`println!`]: https://doc.rust-lang.org/stable/std/macro.println.htmlÁ Ü ú üà] Z Avoid writing expressions with side-effects in log statements. They may not be evaluated.Á ¾ ú œÂ ## In librariesÁ Ö ú üÚG D Libraries should link only to the `log` crate, and use the providedÁ ü¢N K macros to log whatever information will be useful to downstream consumers.Á ñ ú „õ
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### ExamplesÁ † ú <Š ```Á ü’. + # #[derive(Debug)] pub struct Yak(String);Á üÁ1 . # impl Yak { fn shave(&mut self, _: u32) {} }Á üó5 2 # fn find_a_razor() -> Result<u32, u32> { Ok(1) }Á Ô© use log::{info, warn};Á Ä ú üÈ) & pub fn shave_the_yak(yak: &mut Yak) {Á üòJ G info!(target: "yak_events", "Commencing yak shaving for {yak:?}");Á ½ ú tÁ loop {Á üÐ" match find_a_razor() {Á ôó Ok(razor) => {Á ü’4 1 info!("Razor located: {razor}");Á üÇ% " yak.shave(razor);Á Ôí break;Á Œˆ }Á ìš Err(err) => {Á ü¸G D warn!("Unable to locate a razor: {err}, retrying");Á Œ€ ÅŸ l’
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}Á L }Á ,ª }Á ”° # fn main() {}Á <à ǚ Ë ú ¬Ï ## In executablesÁ å ú üéU R Executables should choose a logging implementation and initialize it early in theÁ ü¿L I runtime of the program. Logging implementations will typically include aÁ üŒ: 7 function to do this. Any log messages generated beforeÁ üÇ6 3 the implementation is initialized will be ignored.Á þ ú ü‚A > The executable itself may use the `log` crate to log as well.Á Ä ú |È ### WarningÁ Ø ú üÜ4 1 The logging system may only be initialized once.Á ‘ ú Ì• ## Structured loggingÁ ¯ ú ü³F C If you enable the `kv` feature you can associate structured valuesÁ üúM J with your log records. If we take the example from before, we can includeÁ üÈ D A some additional context besides what's in the formatted message:Á � ú <‘ Çš Ü™ # use serde::Serialize;Á üµ 9 6 # #[derive(Debug, Serialize)] pub struct Yak(String);Á üï 1 �› ü¡ @ = # fn find_a_razor() -> Result<u32, std::io::Error> { Ok(1) }Á üâ " # #[cfg(feature = "kv_serde")]Á Œ… # fn main() {Á Ô— ‰œ ² ú ü¶ ) ¹œ üà I F info!(target: "yak_events", yak:serde; "Commencing yak shaving");Á ª ú t® Ë� ü½ " ã� ôà Žž üÿ 2 / info!(razor; "Razor located");Á ü²!% ôž ÔØ! ¢Ÿ Œó! ÅŸ Ü…" Err(e) => {Á ü¡"G D warn!(e:err; "Unable to locate a razor, retrying");Á Œé" ÅŸ lû" ã L‰# ù ,“# ‹¡ <™# # }Á ü¡#' $ # #[cfg(not(feature = "kv_serde"))]Á ”É# ™¡ <Ü# Çš ä# ú üè#9 6 See the [`kv`] module documentation for more details.Á ¢$ ú ü¦$' $ # Available logging implementationsÁ Î$ ú üÒ$: 7 In order to produce log output executables have to useÁ ü�%7 4 a logger implementation compatible with the facade.Á üÅ%< 9 There are many available implementations to choose from,Á ü‚&+ ( here are some of the most popular ones:Á ®& ú ì²& * Simple minimal loggers:Á ´Ð& * [env_logger]Á Œç& * [colog]Á Ìù& * [simple_logger]Á ¬“' * [simplelog]Á ì©' * [pretty_env_logger]Á ¬Ç' * [stderrlog]Á ÄÝ' * [flexi_logger]Á ¼ö' * [call_logger]Á ´Ž( * [std-logger]Á ì¥( * [structured-logger]Á ¬Ã( * [clang_log]Á ŒÙ( * [ftail]Á üë(& # * Complex configurable frameworks:Á ”’) * [log4rs]Á ¤¥) * [logforth]Á „º)
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* [fern]Á ¬Ë) * [spdlog-rs]Á üá)$ ! * Adaptors for other facilities:Á ”†* * [syslog]Á ¼™* * [slog-stdlog]Á ü±*" * [systemd-journal-logger]Á ¼Ô* * [android_log]Á Ôì* * [win_dbg_logger]Á ¬‡+ * [db_logger]Á Ä�+ * [log-to-defmt]Á Ô¶+ * [logcontrol-log]Á üÑ+ * For WebAssembly binaries:Á ¼ñ+ * [console_log]Á ä‰, * For dynamic libraries:Á ü¦,b _ * You may need to construct an FFI-safe wrapper over `log` to initialize in your librariesÁ „‰-
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* Utilities:Á œš- * [log_err]Á ´®- * [log-reload]Á äÅ- * [alterable_logger]Á â- ú Üæ- # Implementing a LoggerÁ ‚. ú ü†.P M Loggers implement the [`Log`] trait. Here's a very basic example that simplyÁ ü×.K H logs all messages at the [`Error`][level_link], [`Warn`][level_link] orÁ ü£/* ' [`Info`][level_link] levels to stdout:Á Î/ ú <Ò/ Çš üÚ/' $ use log::{Record, Level, Metadata};Á ‚0 ú Ć0 struct SimpleLogger;Á Ÿ0 ú ü£0$ ! impl log::Log for SimpleLogger {Á üÈ08 5 fn enabled(&self, metadata: &Metadata) -> bool {Á ü�1+ ( metadata.level() <= Level::InfoÁ L1 ù ·1 ú ü»1( % fn log(&self, record: &Record) {Á üä10 -
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Í $ Ñ Ò 8 Õ Ø Ù Û 8 Ú $ Ü % ë % ý Û! ž" 8Æ 4Ü! & â! , ä! 8Æ 4å! & ë! 8› $ì! $ ð! 8ê 4ò! & ø! , ú! 8ê 4û! & �" 8› $‚" $ †" , ˆ" 8¿ƒ ‰" & Œ" 8› $�" $ ‘" , “" ”" œ" , •" 8Á –" & ™" 8¯ š" �" * " £" ±% ¤" °% 8 ®" 8¿ƒ ²" ¶" , ¸" 8¿ƒ ¹" % ¼" 8 Æ" 8¿ƒ É" Í" , Ð" 8 ,Ñ" 'Ö" 8¦ „Ø" é" 8¿ƒ ì" ð" , ó" 8 ,ô" 'ù" 8¯ Lû" „# …# ‡# ª% , •# 8 ,–# '›# 8Þ l�# 'ª# 8Ï ¬# ¯# Ÿ% , Á# 8Æ 4Â# $ È# , Ú# 8 ,Û# 'à# 8Þ lâ# 'ï# 8ë \ñ# ü# ý# †$ , þ# ÿ# „$ , €$ 8Á �$ …$ $ ‡$ 8¿ƒ ™$ $ œ$ ®$ ¯$ ü$ , °$ 8ê 4±$ $ ·$ , ¹$ 8 ,º$ '¿$ 8Þ lÁ$ 'Î$ 8¹ \Ð$ Û$ Ü$ Ý$ $ Þ$ , à$ 8 ,á$ 'æ$ 8Þ lè$ 'õ$ 8œ ÷$ ú$ û$ $ ý$ �% �% $ ‘% % % % ²% Ä¥k ü‚cM J Determines if a message logged at the specified level in that module willÁ tÐc be logged.Á ßcú üãcO L This can be used to avoid expensive computation of log message arguments ifÁ ü³d( % the message would be ignored anyway.Á Üdú tàd # ExamplesÁ ïdú <ódÇš üûd) & use log::{debug, log_enabled, Level};Á ¥eú ü©e$ ! # struct Data { x: u32, y: u32 }Á üÎe9 6 # fn expensive_call() -> Data { Data { x: 0, y: 0 } }Á üˆf7 4 # let my_logger = log::__private_api::GlobalLogger;Á üÀf# if log_enabled!(Level::Debug) {Á üäf$ ! let data = expensive_call();Á ü‰g> ; debug!("expensive debug data: {} {}", data.x, data.y);Á ,Èg‹¡ Îgú üÒg5 2 if log_enabled!(target: "Global", Level::Debug) {Á üˆh# let data = expensive_call();Á ü¬hO L debug!(target: "Global", "expensive debug data: {} {}", data.x, data.y);Á ,üh‹¡ ‚iú ü†i6 3 if log_enabled!(logger: my_logger, Level::Debug) {Á ü½i#�œ üáiOÊœ ,±j‹¡ <·jÇš ¿jú üÃjQ N This macro accepts the same `target` and `logger` arguments as [`macro@log`].Á (|•k òK ¾k ³r �l Ãl 8Æ 4Žl & ”l , –l 8Æ 4—l & �l 8› $žl $ ¢l 8ê 4¤l & ªl , ¬l 8ê 4l & ³l 8› $´l $ ¸l , ºl 8¿ƒ »l & ¾l 8› $¿l *Ål Èl ®m Él m , Ól 8 ,Ôl 'Ùl 8ù lÛl èl él §m 8Æ 4êl & ðl , òl 8 ,ól 'øl 8� dúl †m ‡m �m , ˆm 8Æ 4‰m $ �m 8ê 4’m & ˜m , šm 8ê 4›m $ ¡m , £m 8¿ƒ ¤m % ¯m êm Šn 8Æ 4ëm & ñm , óm 8Æ 4ôm & úm 8› $ûm $ ÿm , �n 8¿ƒ ‚n & …n 8› $†n *Œn �n “o �n ’o , šn 8 ,›n ' n
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