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| </pre><pre class="rust"><code><span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| </span><span class="doccomment">//! A simple logger that can be configured via environment variables, for use |
| //! with the logging facade exposed by the [`log` crate][log-crate-url]. |
| //! |
| //! Despite having "env" in its name, **`env_logger`** can also be configured by |
| //! other means besides environment variables. See [the examples][gh-repo-examples] |
| //! in the source repository for more approaches. |
| //! |
| //! By default, `env_logger` writes logs to `stderr`, but can be configured to |
| //! instead write them to `stdout`. |
| //! |
| //! ## Example |
| //! |
| //! ``` |
| //! use log::{debug, error, log_enabled, info, Level}; |
| //! |
| //! env_logger::init(); |
| //! |
| //! debug!("this is a debug {}", "message"); |
| //! error!("this is printed by default"); |
| //! |
| //! if log_enabled!(Level::Info) { |
| //! let x = 3 * 4; // expensive computation |
| //! info!("the answer was: {}", x); |
| //! } |
| //! ``` |
| //! |
| //! Assumes the binary is `main`: |
| //! |
| //! ```{.bash} |
| //! $ RUST_LOG=error ./main |
| //! [2017-11-09T02:12:24Z ERROR main] this is printed by default |
| //! ``` |
| //! |
| //! ```{.bash} |
| //! $ RUST_LOG=info ./main |
| //! [2017-11-09T02:12:24Z ERROR main] this is printed by default |
| //! [2017-11-09T02:12:24Z INFO main] the answer was: 12 |
| //! ``` |
| //! |
| //! ```{.bash} |
| //! $ RUST_LOG=debug ./main |
| //! [2017-11-09T02:12:24Z DEBUG main] this is a debug message |
| //! [2017-11-09T02:12:24Z ERROR main] this is printed by default |
| //! [2017-11-09T02:12:24Z INFO main] the answer was: 12 |
| //! ``` |
| //! |
| //! You can also set the log level on a per module basis: |
| //! |
| //! ```{.bash} |
| //! $ RUST_LOG=main=info ./main |
| //! [2017-11-09T02:12:24Z ERROR main] this is printed by default |
| //! [2017-11-09T02:12:24Z INFO main] the answer was: 12 |
| //! ``` |
| //! |
| //! And enable all logging: |
| //! |
| //! ```{.bash} |
| //! $ RUST_LOG=main ./main |
| //! [2017-11-09T02:12:24Z DEBUG main] this is a debug message |
| //! [2017-11-09T02:12:24Z ERROR main] this is printed by default |
| //! [2017-11-09T02:12:24Z INFO main] the answer was: 12 |
| //! ``` |
| //! |
| //! If the binary name contains hyphens, you will need to replace |
| //! them with underscores: |
| //! |
| //! ```{.bash} |
| //! $ RUST_LOG=my_app ./my-app |
| //! [2017-11-09T02:12:24Z DEBUG my_app] this is a debug message |
| //! [2017-11-09T02:12:24Z ERROR my_app] this is printed by default |
| //! [2017-11-09T02:12:24Z INFO my_app] the answer was: 12 |
| //! ``` |
| //! |
| //! This is because Rust modules and crates cannot contain hyphens |
| //! in their name, although `cargo` continues to accept them. |
| //! |
| //! See the documentation for the [`log` crate][log-crate-url] for more |
| //! information about its API. |
| //! |
| //! ## Enabling logging |
| //! |
| //! Log levels are controlled on a per-module basis, and **by default all |
| //! logging is disabled except for the `error` level**. |
| //! |
| //! Logging is controlled via the **`RUST_LOG`** environment variable. The |
| //! value of this environment variable is a comma-separated list of *logging |
| //! directives*. A logging directive is of the form: |
| //! |
| //! ```text |
| //! example::log::target=level |
| //! ``` |
| //! |
| //! The log target is typically equal to the path of the module the message |
| //! in question originated from, though it can be overriden. |
| //! |
| //! The path is rooted in the name of the crate it was compiled for, so if |
| //! your program is in a file called, for example, `hello.rs`, the path would |
| //! simply be be `hello`. |
| //! |
| //! Furthermore, the log can be filtered using prefix-search based on the |
| //! specified log target. A value of, for example, `RUST_LOG=example`, would |
| //! match all of the messages with targets: |
| //! |
| //! * `example` |
| //! * `example::test` |
| //! * `example::test::module::submodule` |
| //! * `examples::and_more_examples` |
| //! |
| //! When providing the crate name or a module path, explicitly specifying the |
| //! log level is optional. If omitted, all logging for the item will be |
| //! enabled. |
| //! |
| //! The names of the log levels that may be specified correspond to the |
| //! variations of the [`log::Level`][level-enum] enum from the `log` |
| //! crate. They are: |
| //! |
| //! * `error` |
| //! * `warn` |
| //! * `info` |
| //! * `debug` |
| //! * `trace` |
| //! |
| //! There is also a pseudo logging level, `off`, which may be specified to |
| //! disable all logging for a given module or for the entire application. As |
| //! with the logging levels, the letter case is not significant[^fn-off]. |
| //! |
| //! [^fn-off]: Similar to the universe of log level names, the `off` pseudo |
| //! log level feature is also provided by the underlying `log` crate. |
| //! |
| //! The letter case is not significant for the logging level names; e.g., |
| //! `debug`, `DEBUG`, and `dEbuG` all represent the same logging level. For |
| //! consistency, our convention is to use the lower case names. Where our docs |
| //! do use other forms, they do so in the context of specific examples, so you |
| //! won't be surprised if you see similar usage in the wild. |
| //! |
| //! As the log level for a module is optional, the module to enable logging for |
| //! is also optional. **If only a level is provided, then the global log |
| //! level for all modules is set to this value.** |
| //! |
| //! Some examples of valid values of `RUST_LOG` are: |
| //! |
| //! * `hello` turns on all logging for the 'hello' module |
| //! * `trace` turns on all logging for the application, regardless of its name |
| //! * `TRACE` turns on all logging for the application, regardless of its name (same as previous) |
| //! * `info` turns on all info logging |
| //! * `INFO` turns on all info logging (same as previous) |
| //! * `hello=debug` turns on debug logging for 'hello' |
| //! * `hello=DEBUG` turns on debug logging for 'hello' (same as previous) |
| //! * `hello,std::option` turns on hello, and std's option logging |
| //! * `error,hello=warn` turn on global error logging and also warn for hello |
| //! * `error,hello=off` turn on global error logging, but turn off logging for hello |
| //! * `off` turns off all logging for the application |
| //! * `OFF` turns off all logging for the application (same as previous) |
| //! |
| //! ## Filtering results |
| //! |
| //! A `RUST_LOG` directive may include a regex filter. The syntax is to append `/` |
| //! followed by a regex. Each message is checked against the regex, and is only |
| //! logged if it matches. Note that the matching is done after formatting the |
| //! log string but before adding any logging meta-data. There is a single filter |
| //! for all modules. |
| //! |
| //! Some examples: |
| //! |
| //! * `hello/foo` turns on all logging for the 'hello' module where the log |
| //! message includes 'foo'. |
| //! * `info/f.o` turns on all info logging where the log message includes 'foo', |
| //! 'f1o', 'fao', etc. |
| //! * `hello=debug/foo*foo` turns on debug logging for 'hello' where the log |
| //! message includes 'foofoo' or 'fofoo' or 'fooooooofoo', etc. |
| //! * `error,hello=warn/[0-9]scopes` turn on global error logging and also |
| //! warn for hello. In both cases the log message must include a single digit |
| //! number followed by 'scopes'. |
| //! |
| //! ## Capturing logs in tests |
| //! |
| //! Records logged during `cargo test` will not be captured by the test harness by default. |
| //! The [`Builder::is_test`] method can be used in unit tests to ensure logs will be captured: |
| //! |
| //! ``` |
| //! # #[macro_use] extern crate log; |
| //! #[cfg(test)] |
| //! mod tests { |
| //! fn init() { |
| //! let _ = env_logger::builder().is_test(true).try_init(); |
| //! } |
| //! |
| //! #[test] |
| //! fn it_works() { |
| //! init(); |
| //! |
| //! info!("This record will be captured by `cargo test`"); |
| //! |
| //! assert_eq!(2, 1 + 1); |
| //! } |
| //! } |
| //! ``` |
| //! |
| //! Enabling test capturing comes at the expense of color and other style support |
| //! and may have performance implications. |
| //! |
| //! ## Disabling colors |
| //! |
| //! Colors and other styles can be configured with the `RUST_LOG_STYLE` |
| //! environment variable. It accepts the following values: |
| //! |
| //! * `auto` (default) will attempt to print style characters, but don't force the issue. |
| //! If the console isn't available on Windows, or if TERM=dumb, for example, then don't print colors. |
| //! * `always` will always print style characters even if they aren't supported by the terminal. |
| //! This includes emitting ANSI colors on Windows if the console API is unavailable. |
| //! * `never` will never print style characters. |
| //! |
| //! ## Tweaking the default format |
| //! |
| //! Parts of the default format can be excluded from the log output using the [`Builder`]. |
| //! The following example excludes the timestamp from the log output: |
| //! |
| //! ``` |
| //! env_logger::builder() |
| //! .format_timestamp(None) |
| //! .init(); |
| //! ``` |
| //! |
| //! ### Stability of the default format |
| //! |
| //! The default format won't optimise for long-term stability, and explicitly makes no |
| //! guarantees about the stability of its output across major, minor or patch version |
| //! bumps during `0.x`. |
| //! |
| //! If you want to capture or interpret the output of `env_logger` programmatically |
| //! then you should use a custom format. |
| //! |
| //! ### Using a custom format |
| //! |
| //! Custom formats can be provided as closures to the [`Builder`]. |
| //! These closures take a [`Formatter`] and `log::Record` as arguments: |
| //! |
| //! ``` |
| //! use std::io::Write; |
| //! |
| //! env_logger::builder() |
| //! .format(|buf, record| { |
| //! writeln!(buf, "{}: {}", record.level(), record.args()) |
| //! }) |
| //! .init(); |
| //! ``` |
| //! |
| //! See the [`fmt`] module for more details about custom formats. |
| //! |
| //! ## Specifying defaults for environment variables |
| //! |
| //! `env_logger` can read configuration from environment variables. |
| //! If these variables aren't present, the default value to use can be tweaked with the [`Env`] type. |
| //! The following example defaults to log `warn` and above if the `RUST_LOG` environment variable |
| //! isn't set: |
| //! |
| //! ``` |
| //! use env_logger::Env; |
| //! |
| //! env_logger::Builder::from_env(Env::default().default_filter_or("warn")).init(); |
| //! ``` |
| //! |
| //! [gh-repo-examples]: https://github.com/env-logger-rs/env_logger/tree/main/examples |
| //! [level-enum]: https://docs.rs/log/latest/log/enum.Level.html |
| //! [log-crate-url]: https://docs.rs/log/ |
| //! [`Builder`]: struct.Builder.html |
| //! [`Builder::is_test`]: struct.Builder.html#method.is_test |
| //! [`Env`]: struct.Env.html |
| //! [`fmt`]: fmt/index.html |
| |
| </span><span class="attribute">#![doc( |
| html_logo_url = <span class="string">"https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png"</span>, |
| html_favicon_url = <span class="string">"https://www.rust-lang.org/static/images/favicon.ico" |
| </span>)] |
| </span><span class="comment">// When compiled for the rustc compiler itself we want to make sure that this is |
| // an unstable crate |
| </span><span class="attribute">#![cfg_attr(rustbuild, feature(staged_api, rustc_private))] |
| #![cfg_attr(rustbuild, unstable(feature = <span class="string">"rustc_private"</span>, issue = <span class="string">"27812"</span>))] |
| #![deny(missing_debug_implementations, missing_docs)] |
| |
| </span><span class="kw">use </span>std::{borrow::Cow, cell::RefCell, env, io}; |
| |
| <span class="kw">use </span>log::{LevelFilter, Log, Metadata, Record, SetLoggerError}; |
| |
| <span class="kw">pub mod </span>filter; |
| <span class="kw">pub mod </span>fmt; |
| |
| <span class="kw">pub use </span><span class="self">self</span>::fmt::glob::<span class="kw-2">*</span>; |
| |
| <span class="kw">use </span><span class="self">self</span>::filter::Filter; |
| <span class="kw">use </span><span class="self">self</span>::fmt::writer::{<span class="self">self</span>, Writer}; |
| <span class="kw">use </span><span class="self">self</span>::fmt::{FormatFn, Formatter}; |
| |
| <span class="doccomment">/// The default name for the environment variable to read filters from. |
| </span><span class="kw">pub const </span>DEFAULT_FILTER_ENV: <span class="kw-2">&</span>str = <span class="string">"RUST_LOG"</span>; |
| |
| <span class="doccomment">/// The default name for the environment variable to read style preferences from. |
| </span><span class="kw">pub const </span>DEFAULT_WRITE_STYLE_ENV: <span class="kw-2">&</span>str = <span class="string">"RUST_LOG_STYLE"</span>; |
| |
| <span class="doccomment">/// Set of environment variables to configure from. |
| /// |
| /// # Default environment variables |
| /// |
| /// By default, the `Env` will read the following environment variables: |
| /// |
| /// - `RUST_LOG`: the level filter |
| /// - `RUST_LOG_STYLE`: whether or not to print styles with records. |
| /// |
| /// These sources can be configured using the builder methods on `Env`. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Env<<span class="lifetime">'a</span>> { |
| filter: Var<<span class="lifetime">'a</span>>, |
| write_style: Var<<span class="lifetime">'a</span>>, |
| } |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">struct </span>Var<<span class="lifetime">'a</span>> { |
| name: Cow<<span class="lifetime">'a</span>, str>, |
| default: <span class="prelude-ty">Option</span><Cow<<span class="lifetime">'a</span>, str>>, |
| } |
| |
| <span class="doccomment">/// The env logger. |
| /// |
| /// This struct implements the `Log` trait from the [`log` crate][log-crate-url], |
| /// which allows it to act as a logger. |
| /// |
| /// The [`init()`], [`try_init()`], [`Builder::init()`] and [`Builder::try_init()`] |
| /// methods will each construct a `Logger` and immediately initialize it as the |
| /// default global logger. |
| /// |
| /// If you'd instead need access to the constructed `Logger`, you can use |
| /// the associated [`Builder`] and install it with the |
| /// [`log` crate][log-crate-url] directly. |
| /// |
| /// [log-crate-url]: https://docs.rs/log/ |
| /// [`init()`]: fn.init.html |
| /// [`try_init()`]: fn.try_init.html |
| /// [`Builder::init()`]: struct.Builder.html#method.init |
| /// [`Builder::try_init()`]: struct.Builder.html#method.try_init |
| /// [`Builder`]: struct.Builder.html |
| </span><span class="kw">pub struct </span>Logger { |
| writer: Writer, |
| filter: Filter, |
| format: FormatFn, |
| } |
| |
| <span class="doccomment">/// `Builder` acts as builder for initializing a `Logger`. |
| /// |
| /// It can be used to customize the log format, change the environment variable used |
| /// to provide the logging directives and also set the default log level filter. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # #[macro_use] extern crate log; |
| /// # use std::io::Write; |
| /// use env_logger::Builder; |
| /// use log::LevelFilter; |
| /// |
| /// let mut builder = Builder::from_default_env(); |
| /// |
| /// builder |
| /// .format(|buf, record| writeln!(buf, "{} - {}", record.level(), record.args())) |
| /// .filter(None, LevelFilter::Info) |
| /// .init(); |
| /// |
| /// error!("error message"); |
| /// info!("info message"); |
| /// ``` |
| </span><span class="attribute">#[derive(Default)] |
| </span><span class="kw">pub struct </span>Builder { |
| filter: filter::Builder, |
| writer: writer::Builder, |
| format: fmt::Builder, |
| built: bool, |
| } |
| |
| <span class="kw">impl </span>Builder { |
| <span class="doccomment">/// Initializes the log builder with defaults. |
| /// |
| /// **NOTE:** This method won't read from any environment variables. |
| /// Use the [`filter`] and [`write_style`] methods to configure the builder |
| /// or use [`from_env`] or [`from_default_env`] instead. |
| /// |
| /// # Examples |
| /// |
| /// Create a new builder and configure filters and style: |
| /// |
| /// ``` |
| /// use log::LevelFilter; |
| /// use env_logger::{Builder, WriteStyle}; |
| /// |
| /// let mut builder = Builder::new(); |
| /// |
| /// builder |
| /// .filter(None, LevelFilter::Info) |
| /// .write_style(WriteStyle::Always) |
| /// .init(); |
| /// ``` |
| /// |
| /// [`filter`]: #method.filter |
| /// [`write_style`]: #method.write_style |
| /// [`from_env`]: #method.from_env |
| /// [`from_default_env`]: #method.from_default_env |
| </span><span class="kw">pub fn </span>new() -> Builder { |
| Default::default() |
| } |
| |
| <span class="doccomment">/// Initializes the log builder from the environment. |
| /// |
| /// The variables used to read configuration from can be tweaked before |
| /// passing in. |
| /// |
| /// # Examples |
| /// |
| /// Initialise a logger reading the log filter from an environment variable |
| /// called `MY_LOG`: |
| /// |
| /// ``` |
| /// use env_logger::Builder; |
| /// |
| /// let mut builder = Builder::from_env("MY_LOG"); |
| /// builder.init(); |
| /// ``` |
| /// |
| /// Initialise a logger using the `MY_LOG` variable for filtering and |
| /// `MY_LOG_STYLE` for whether or not to write styles: |
| /// |
| /// ``` |
| /// use env_logger::{Builder, Env}; |
| /// |
| /// let env = Env::new().filter("MY_LOG").write_style("MY_LOG_STYLE"); |
| /// |
| /// let mut builder = Builder::from_env(env); |
| /// builder.init(); |
| /// ``` |
| </span><span class="kw">pub fn </span>from_env<<span class="lifetime">'a</span>, E>(env: E) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>E: Into<Env<<span class="lifetime">'a</span>>>, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>builder = Builder::new(); |
| builder.parse_env(env); |
| builder |
| } |
| |
| <span class="doccomment">/// Applies the configuration from the environment. |
| /// |
| /// This function allows a builder to be configured with default parameters, |
| /// to be then overridden by the environment. |
| /// |
| /// # Examples |
| /// |
| /// Initialise a logger with filter level `Off`, then override the log |
| /// filter from an environment variable called `MY_LOG`: |
| /// |
| /// ``` |
| /// use log::LevelFilter; |
| /// use env_logger::Builder; |
| /// |
| /// let mut builder = Builder::new(); |
| /// |
| /// builder.filter_level(LevelFilter::Off); |
| /// builder.parse_env("MY_LOG"); |
| /// builder.init(); |
| /// ``` |
| /// |
| /// Initialise a logger with filter level `Off`, then use the `MY_LOG` |
| /// variable to override filtering and `MY_LOG_STYLE` to override whether |
| /// or not to write styles: |
| /// |
| /// ``` |
| /// use log::LevelFilter; |
| /// use env_logger::{Builder, Env}; |
| /// |
| /// let env = Env::new().filter("MY_LOG").write_style("MY_LOG_STYLE"); |
| /// |
| /// let mut builder = Builder::new(); |
| /// builder.filter_level(LevelFilter::Off); |
| /// builder.parse_env(env); |
| /// builder.init(); |
| /// ``` |
| </span><span class="kw">pub fn </span>parse_env<<span class="lifetime">'a</span>, E>(<span class="kw-2">&mut </span><span class="self">self</span>, env: E) -> <span class="kw-2">&mut </span><span class="self">Self |
| </span><span class="kw">where |
| </span>E: Into<Env<<span class="lifetime">'a</span>>>, |
| { |
| <span class="kw">let </span>env = env.into(); |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(s) = env.get_filter() { |
| <span class="self">self</span>.parse_filters(<span class="kw-2">&</span>s); |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(s) = env.get_write_style() { |
| <span class="self">self</span>.parse_write_style(<span class="kw-2">&</span>s); |
| } |
| |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Initializes the log builder from the environment using default variable names. |
| /// |
| /// This method is a convenient way to call `from_env(Env::default())` without |
| /// having to use the `Env` type explicitly. The builder will use the |
| /// [default environment variables]. |
| /// |
| /// # Examples |
| /// |
| /// Initialise a logger using the default environment variables: |
| /// |
| /// ``` |
| /// use env_logger::Builder; |
| /// |
| /// let mut builder = Builder::from_default_env(); |
| /// builder.init(); |
| /// ``` |
| /// |
| /// [default environment variables]: struct.Env.html#default-environment-variables |
| </span><span class="kw">pub fn </span>from_default_env() -> <span class="self">Self </span>{ |
| <span class="self">Self</span>::from_env(Env::default()) |
| } |
| |
| <span class="doccomment">/// Applies the configuration from the environment using default variable names. |
| /// |
| /// This method is a convenient way to call `parse_env(Env::default())` without |
| /// having to use the `Env` type explicitly. The builder will use the |
| /// [default environment variables]. |
| /// |
| /// # Examples |
| /// |
| /// Initialise a logger with filter level `Off`, then configure it using the |
| /// default environment variables: |
| /// |
| /// ``` |
| /// use log::LevelFilter; |
| /// use env_logger::Builder; |
| /// |
| /// let mut builder = Builder::new(); |
| /// builder.filter_level(LevelFilter::Off); |
| /// builder.parse_default_env(); |
| /// builder.init(); |
| /// ``` |
| /// |
| /// [default environment variables]: struct.Env.html#default-environment-variables |
| </span><span class="kw">pub fn </span>parse_default_env(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.parse_env(Env::default()) |
| } |
| |
| <span class="doccomment">/// Sets the format function for formatting the log output. |
| /// |
| /// This function is called on each record logged and should format the |
| /// log record and output it to the given [`Formatter`]. |
| /// |
| /// The format function is expected to output the string directly to the |
| /// `Formatter` so that implementations can use the [`std::fmt`] macros |
| /// to format and output without intermediate heap allocations. The default |
| /// `env_logger` formatter takes advantage of this. |
| /// |
| /// # Examples |
| /// |
| /// Use a custom format to write only the log message: |
| /// |
| /// ``` |
| /// use std::io::Write; |
| /// use env_logger::Builder; |
| /// |
| /// let mut builder = Builder::new(); |
| /// |
| /// builder.format(|buf, record| writeln!(buf, "{}", record.args())); |
| /// ``` |
| /// |
| /// [`Formatter`]: fmt/struct.Formatter.html |
| /// [`String`]: https://doc.rust-lang.org/stable/std/string/struct.String.html |
| /// [`std::fmt`]: https://doc.rust-lang.org/std/fmt/index.html |
| </span><span class="kw">pub fn </span>format<F: <span class="lifetime">'static</span>>(<span class="kw-2">&mut </span><span class="self">self</span>, format: F) -> <span class="kw-2">&mut </span><span class="self">Self |
| </span><span class="kw">where |
| </span>F: Fn(<span class="kw-2">&mut </span>Formatter, <span class="kw-2">&</span>Record) -> io::Result<()> + Sync + Send, |
| { |
| <span class="self">self</span>.format.custom_format = <span class="prelude-val">Some</span>(Box::new(format)); |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Use the default format. |
| /// |
| /// This method will clear any custom format set on the builder. |
| </span><span class="kw">pub fn </span>default_format(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.format = Default::default(); |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Whether or not to write the level in the default format. |
| </span><span class="kw">pub fn </span>format_level(<span class="kw-2">&mut </span><span class="self">self</span>, write: bool) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.format.format_level = write; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Whether or not to write the module path in the default format. |
| </span><span class="kw">pub fn </span>format_module_path(<span class="kw-2">&mut </span><span class="self">self</span>, write: bool) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.format.format_module_path = write; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Whether or not to write the target in the default format. |
| </span><span class="kw">pub fn </span>format_target(<span class="kw-2">&mut </span><span class="self">self</span>, write: bool) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.format.format_target = write; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Configures the amount of spaces to use to indent multiline log records. |
| /// A value of `None` disables any kind of indentation. |
| </span><span class="kw">pub fn </span>format_indent(<span class="kw-2">&mut </span><span class="self">self</span>, indent: <span class="prelude-ty">Option</span><usize>) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.format.format_indent = indent; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Configures if timestamp should be included and in what precision. |
| </span><span class="kw">pub fn </span>format_timestamp(<span class="kw-2">&mut </span><span class="self">self</span>, timestamp: <span class="prelude-ty">Option</span><fmt::TimestampPrecision>) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.format.format_timestamp = timestamp; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Configures the timestamp to use second precision. |
| </span><span class="kw">pub fn </span>format_timestamp_secs(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.format_timestamp(<span class="prelude-val">Some</span>(fmt::TimestampPrecision::Seconds)) |
| } |
| |
| <span class="doccomment">/// Configures the timestamp to use millisecond precision. |
| </span><span class="kw">pub fn </span>format_timestamp_millis(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.format_timestamp(<span class="prelude-val">Some</span>(fmt::TimestampPrecision::Millis)) |
| } |
| |
| <span class="doccomment">/// Configures the timestamp to use microsecond precision. |
| </span><span class="kw">pub fn </span>format_timestamp_micros(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.format_timestamp(<span class="prelude-val">Some</span>(fmt::TimestampPrecision::Micros)) |
| } |
| |
| <span class="doccomment">/// Configures the timestamp to use nanosecond precision. |
| </span><span class="kw">pub fn </span>format_timestamp_nanos(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.format_timestamp(<span class="prelude-val">Some</span>(fmt::TimestampPrecision::Nanos)) |
| } |
| |
| <span class="doccomment">/// Configures the end of line suffix. |
| </span><span class="kw">pub fn </span>format_suffix(<span class="kw-2">&mut </span><span class="self">self</span>, suffix: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.format.format_suffix = suffix; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Adds a directive to the filter for a specific module. |
| /// |
| /// # Examples |
| /// |
| /// Only include messages for info and above for logs in `path::to::module`: |
| /// |
| /// ``` |
| /// use env_logger::Builder; |
| /// use log::LevelFilter; |
| /// |
| /// let mut builder = Builder::new(); |
| /// |
| /// builder.filter_module("path::to::module", LevelFilter::Info); |
| /// ``` |
| </span><span class="kw">pub fn </span>filter_module(<span class="kw-2">&mut </span><span class="self">self</span>, module: <span class="kw-2">&</span>str, level: LevelFilter) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.filter.filter_module(module, level); |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Adds a directive to the filter for all modules. |
| /// |
| /// # Examples |
| /// |
| /// Only include messages for info and above for logs globally: |
| /// |
| /// ``` |
| /// use env_logger::Builder; |
| /// use log::LevelFilter; |
| /// |
| /// let mut builder = Builder::new(); |
| /// |
| /// builder.filter_level(LevelFilter::Info); |
| /// ``` |
| </span><span class="kw">pub fn </span>filter_level(<span class="kw-2">&mut </span><span class="self">self</span>, level: LevelFilter) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.filter.filter_level(level); |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Adds filters to the logger. |
| /// |
| /// The given module (if any) will log at most the specified level provided. |
| /// If no module is provided then the filter will apply to all log messages. |
| /// |
| /// # Examples |
| /// |
| /// Only include messages for info and above for logs in `path::to::module`: |
| /// |
| /// ``` |
| /// use env_logger::Builder; |
| /// use log::LevelFilter; |
| /// |
| /// let mut builder = Builder::new(); |
| /// |
| /// builder.filter(Some("path::to::module"), LevelFilter::Info); |
| /// ``` |
| </span><span class="kw">pub fn </span>filter(<span class="kw-2">&mut </span><span class="self">self</span>, module: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>str>, level: LevelFilter) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.filter.filter(module, level); |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Parses the directives string in the same form as the `RUST_LOG` |
| /// environment variable. |
| /// |
| /// See the module documentation for more details. |
| </span><span class="kw">pub fn </span>parse_filters(<span class="kw-2">&mut </span><span class="self">self</span>, filters: <span class="kw-2">&</span>str) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.filter.parse(filters); |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Sets the target for the log output. |
| /// |
| /// Env logger can log to either stdout, stderr or a custom pipe. The default is stderr. |
| /// |
| /// The custom pipe can be used to send the log messages to a custom sink (for example a file). |
| /// Do note that direct writes to a file can become a bottleneck due to IO operation times. |
| /// |
| /// # Examples |
| /// |
| /// Write log message to `stdout`: |
| /// |
| /// ``` |
| /// use env_logger::{Builder, Target}; |
| /// |
| /// let mut builder = Builder::new(); |
| /// |
| /// builder.target(Target::Stdout); |
| /// ``` |
| </span><span class="kw">pub fn </span>target(<span class="kw-2">&mut </span><span class="self">self</span>, target: fmt::Target) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.writer.target(target); |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Sets whether or not styles will be written. |
| /// |
| /// This can be useful in environments that don't support control characters |
| /// for setting colors. |
| /// |
| /// # Examples |
| /// |
| /// Never attempt to write styles: |
| /// |
| /// ``` |
| /// use env_logger::{Builder, WriteStyle}; |
| /// |
| /// let mut builder = Builder::new(); |
| /// |
| /// builder.write_style(WriteStyle::Never); |
| /// ``` |
| </span><span class="kw">pub fn </span>write_style(<span class="kw-2">&mut </span><span class="self">self</span>, write_style: fmt::WriteStyle) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.writer.write_style(write_style); |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Parses whether or not to write styles in the same form as the `RUST_LOG_STYLE` |
| /// environment variable. |
| /// |
| /// See the module documentation for more details. |
| </span><span class="kw">pub fn </span>parse_write_style(<span class="kw-2">&mut </span><span class="self">self</span>, write_style: <span class="kw-2">&</span>str) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.writer.parse_write_style(write_style); |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Sets whether or not the logger will be used in unit tests. |
| /// |
| /// If `is_test` is `true` then the logger will allow the testing framework to |
| /// capture log records rather than printing them to the terminal directly. |
| </span><span class="kw">pub fn </span>is_test(<span class="kw-2">&mut </span><span class="self">self</span>, is_test: bool) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self</span>.writer.is_test(is_test); |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Initializes the global logger with the built env logger. |
| /// |
| /// This should be called early in the execution of a Rust program. Any log |
| /// events that occur before initialization will be ignored. |
| /// |
| /// # Errors |
| /// |
| /// This function will fail if it is called more than once, or if another |
| /// library has already initialized a global logger. |
| </span><span class="kw">pub fn </span>try_init(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><(), SetLoggerError> { |
| <span class="kw">let </span>logger = <span class="self">self</span>.build(); |
| |
| <span class="kw">let </span>max_level = logger.filter(); |
| <span class="kw">let </span>r = log::set_boxed_logger(Box::new(logger)); |
| |
| <span class="kw">if </span>r.is_ok() { |
| log::set_max_level(max_level); |
| } |
| |
| r |
| } |
| |
| <span class="doccomment">/// Initializes the global logger with the built env logger. |
| /// |
| /// This should be called early in the execution of a Rust program. Any log |
| /// events that occur before initialization will be ignored. |
| /// |
| /// # Panics |
| /// |
| /// This function will panic if it is called more than once, or if another |
| /// library has already initialized a global logger. |
| </span><span class="kw">pub fn </span>init(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.try_init() |
| .expect(<span class="string">"Builder::init should not be called after logger initialized"</span>); |
| } |
| |
| <span class="doccomment">/// Build an env logger. |
| /// |
| /// The returned logger implements the `Log` trait and can be installed manually |
| /// or nested within another logger. |
| </span><span class="kw">pub fn </span>build(<span class="kw-2">&mut </span><span class="self">self</span>) -> Logger { |
| <span class="macro">assert!</span>(!<span class="self">self</span>.built, <span class="string">"attempt to re-use consumed builder"</span>); |
| <span class="self">self</span>.built = <span class="bool-val">true</span>; |
| |
| Logger { |
| writer: <span class="self">self</span>.writer.build(), |
| filter: <span class="self">self</span>.filter.build(), |
| format: <span class="self">self</span>.format.build(), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Logger { |
| <span class="doccomment">/// Creates the logger from the environment. |
| /// |
| /// The variables used to read configuration from can be tweaked before |
| /// passing in. |
| /// |
| /// # Examples |
| /// |
| /// Create a logger reading the log filter from an environment variable |
| /// called `MY_LOG`: |
| /// |
| /// ``` |
| /// use env_logger::Logger; |
| /// |
| /// let logger = Logger::from_env("MY_LOG"); |
| /// ``` |
| /// |
| /// Create a logger using the `MY_LOG` variable for filtering and |
| /// `MY_LOG_STYLE` for whether or not to write styles: |
| /// |
| /// ``` |
| /// use env_logger::{Logger, Env}; |
| /// |
| /// let env = Env::new().filter_or("MY_LOG", "info").write_style_or("MY_LOG_STYLE", "always"); |
| /// |
| /// let logger = Logger::from_env(env); |
| /// ``` |
| </span><span class="kw">pub fn </span>from_env<<span class="lifetime">'a</span>, E>(env: E) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>E: Into<Env<<span class="lifetime">'a</span>>>, |
| { |
| Builder::from_env(env).build() |
| } |
| |
| <span class="doccomment">/// Creates the logger from the environment using default variable names. |
| /// |
| /// This method is a convenient way to call `from_env(Env::default())` without |
| /// having to use the `Env` type explicitly. The logger will use the |
| /// [default environment variables]. |
| /// |
| /// # Examples |
| /// |
| /// Creates a logger using the default environment variables: |
| /// |
| /// ``` |
| /// use env_logger::Logger; |
| /// |
| /// let logger = Logger::from_default_env(); |
| /// ``` |
| /// |
| /// [default environment variables]: struct.Env.html#default-environment-variables |
| </span><span class="kw">pub fn </span>from_default_env() -> <span class="self">Self </span>{ |
| Builder::from_default_env().build() |
| } |
| |
| <span class="doccomment">/// Returns the maximum `LevelFilter` that this env logger instance is |
| /// configured to output. |
| </span><span class="kw">pub fn </span>filter(<span class="kw-2">&</span><span class="self">self</span>) -> LevelFilter { |
| <span class="self">self</span>.filter.filter() |
| } |
| |
| <span class="doccomment">/// Checks if this record matches the configured filter. |
| </span><span class="kw">pub fn </span>matches(<span class="kw-2">&</span><span class="self">self</span>, record: <span class="kw-2">&</span>Record) -> bool { |
| <span class="self">self</span>.filter.matches(record) |
| } |
| } |
| |
| <span class="kw">impl </span>Log <span class="kw">for </span>Logger { |
| <span class="kw">fn </span>enabled(<span class="kw-2">&</span><span class="self">self</span>, metadata: <span class="kw-2">&</span>Metadata) -> bool { |
| <span class="self">self</span>.filter.enabled(metadata) |
| } |
| |
| <span class="kw">fn </span>log(<span class="kw-2">&</span><span class="self">self</span>, record: <span class="kw-2">&</span>Record) { |
| <span class="kw">if </span><span class="self">self</span>.matches(record) { |
| <span class="comment">// Log records are written to a thread-local buffer before being printed |
| // to the terminal. We clear these buffers afterwards, but they aren't shrinked |
| // so will always at least have capacity for the largest log record formatted |
| // on that thread. |
| // |
| // If multiple `Logger`s are used by the same threads then the thread-local |
| // formatter might have different color support. If this is the case the |
| // formatter and its buffer are discarded and recreated. |
| |
| </span><span class="macro">thread_local! </span>{ |
| <span class="kw">static </span>FORMATTER: RefCell<<span class="prelude-ty">Option</span><Formatter>> = RefCell::new(<span class="prelude-val">None</span>); |
| } |
| |
| <span class="kw">let </span>print = |formatter: <span class="kw-2">&mut </span>Formatter, record: <span class="kw-2">&</span>Record| { |
| <span class="kw">let _ </span>= |
| (<span class="self">self</span>.format)(formatter, record).and_then(|<span class="kw">_</span>| formatter.print(<span class="kw-2">&</span><span class="self">self</span>.writer)); |
| |
| <span class="comment">// Always clear the buffer afterwards |
| </span>formatter.clear(); |
| }; |
| |
| <span class="kw">let </span>printed = FORMATTER |
| .try_with(|tl_buf| { |
| <span class="kw">match </span>tl_buf.try_borrow_mut() { |
| <span class="comment">// There are no active borrows of the buffer |
| </span><span class="prelude-val">Ok</span>(<span class="kw-2">mut </span>tl_buf) => <span class="kw">match </span><span class="kw-2">*</span>tl_buf { |
| <span class="comment">// We have a previously set formatter |
| </span><span class="prelude-val">Some</span>(<span class="kw-2">ref mut </span>formatter) => { |
| <span class="comment">// Check the buffer style. If it's different from the logger's |
| // style then drop the buffer and recreate it. |
| </span><span class="kw">if </span>formatter.write_style() != <span class="self">self</span>.writer.write_style() { |
| <span class="kw-2">*</span>formatter = Formatter::new(<span class="kw-2">&</span><span class="self">self</span>.writer); |
| } |
| |
| print(formatter, record); |
| } |
| <span class="comment">// We don't have a previously set formatter |
| </span><span class="prelude-val">None </span>=> { |
| <span class="kw">let </span><span class="kw-2">mut </span>formatter = Formatter::new(<span class="kw-2">&</span><span class="self">self</span>.writer); |
| print(<span class="kw-2">&mut </span>formatter, record); |
| |
| <span class="kw-2">*</span>tl_buf = <span class="prelude-val">Some</span>(formatter); |
| } |
| }, |
| <span class="comment">// There's already an active borrow of the buffer (due to re-entrancy) |
| </span><span class="prelude-val">Err</span>(<span class="kw">_</span>) => { |
| print(<span class="kw-2">&mut </span>Formatter::new(<span class="kw-2">&</span><span class="self">self</span>.writer), record); |
| } |
| } |
| }) |
| .is_ok(); |
| |
| <span class="kw">if </span>!printed { |
| <span class="comment">// The thread-local storage was not available (because its |
| // destructor has already run). Create a new single-use |
| // Formatter on the stack for this call. |
| </span>print(<span class="kw-2">&mut </span>Formatter::new(<span class="kw-2">&</span><span class="self">self</span>.writer), record); |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>flush(<span class="kw-2">&</span><span class="self">self</span>) {} |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Env<<span class="lifetime">'a</span>> { |
| <span class="doccomment">/// Get a default set of environment variables. |
| </span><span class="kw">pub fn </span>new() -> <span class="self">Self </span>{ |
| <span class="self">Self</span>::default() |
| } |
| |
| <span class="doccomment">/// Specify an environment variable to read the filter from. |
| </span><span class="kw">pub fn </span>filter<E>(<span class="kw-2">mut </span><span class="self">self</span>, filter_env: E) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>E: Into<Cow<<span class="lifetime">'a</span>, str>>, |
| { |
| <span class="self">self</span>.filter = Var::new(filter_env); |
| |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Specify an environment variable to read the filter from. |
| /// |
| /// If the variable is not set, the default value will be used. |
| </span><span class="kw">pub fn </span>filter_or<E, V>(<span class="kw-2">mut </span><span class="self">self</span>, filter_env: E, default: V) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>E: Into<Cow<<span class="lifetime">'a</span>, str>>, |
| V: Into<Cow<<span class="lifetime">'a</span>, str>>, |
| { |
| <span class="self">self</span>.filter = Var::new_with_default(filter_env, default); |
| |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Use the default environment variable to read the filter from. |
| /// |
| /// If the variable is not set, the default value will be used. |
| </span><span class="kw">pub fn </span>default_filter_or<V>(<span class="kw-2">mut </span><span class="self">self</span>, default: V) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>V: Into<Cow<<span class="lifetime">'a</span>, str>>, |
| { |
| <span class="self">self</span>.filter = Var::new_with_default(DEFAULT_FILTER_ENV, default); |
| |
| <span class="self">self |
| </span>} |
| |
| <span class="kw">fn </span>get_filter(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><String> { |
| <span class="self">self</span>.filter.get() |
| } |
| |
| <span class="doccomment">/// Specify an environment variable to read the style from. |
| </span><span class="kw">pub fn </span>write_style<E>(<span class="kw-2">mut </span><span class="self">self</span>, write_style_env: E) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>E: Into<Cow<<span class="lifetime">'a</span>, str>>, |
| { |
| <span class="self">self</span>.write_style = Var::new(write_style_env); |
| |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Specify an environment variable to read the style from. |
| /// |
| /// If the variable is not set, the default value will be used. |
| </span><span class="kw">pub fn </span>write_style_or<E, V>(<span class="kw-2">mut </span><span class="self">self</span>, write_style_env: E, default: V) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>E: Into<Cow<<span class="lifetime">'a</span>, str>>, |
| V: Into<Cow<<span class="lifetime">'a</span>, str>>, |
| { |
| <span class="self">self</span>.write_style = Var::new_with_default(write_style_env, default); |
| |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Use the default environment variable to read the style from. |
| /// |
| /// If the variable is not set, the default value will be used. |
| </span><span class="kw">pub fn </span>default_write_style_or<V>(<span class="kw-2">mut </span><span class="self">self</span>, default: V) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>V: Into<Cow<<span class="lifetime">'a</span>, str>>, |
| { |
| <span class="self">self</span>.write_style = Var::new_with_default(DEFAULT_WRITE_STYLE_ENV, default); |
| |
| <span class="self">self |
| </span>} |
| |
| <span class="kw">fn </span>get_write_style(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><String> { |
| <span class="self">self</span>.write_style.get() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Var<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>new<E>(name: E) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>E: Into<Cow<<span class="lifetime">'a</span>, str>>, |
| { |
| Var { |
| name: name.into(), |
| default: <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="kw">fn </span>new_with_default<E, V>(name: E, default: V) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>E: Into<Cow<<span class="lifetime">'a</span>, str>>, |
| V: Into<Cow<<span class="lifetime">'a</span>, str>>, |
| { |
| Var { |
| name: name.into(), |
| default: <span class="prelude-val">Some</span>(default.into()), |
| } |
| } |
| |
| <span class="kw">fn </span>get(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><String> { |
| env::var(<span class="kw-2">&*</span><span class="self">self</span>.name) |
| .ok() |
| .or_else(|| <span class="self">self</span>.default.to_owned().map(|v| v.into_owned())) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> From<T> <span class="kw">for </span>Env<<span class="lifetime">'a</span>> |
| <span class="kw">where |
| </span>T: Into<Cow<<span class="lifetime">'a</span>, str>>, |
| { |
| <span class="kw">fn </span>from(filter_env: T) -> <span class="self">Self </span>{ |
| Env::default().filter(filter_env.into()) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Default <span class="kw">for </span>Env<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| Env { |
| filter: Var::new(DEFAULT_FILTER_ENV), |
| write_style: Var::new(DEFAULT_WRITE_STYLE_ENV), |
| } |
| } |
| } |
| |
| <span class="kw">mod </span>std_fmt_impls { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span>std::fmt; |
| |
| <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Logger { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| f.debug_struct(<span class="string">"Logger"</span>) |
| .field(<span class="string">"filter"</span>, <span class="kw-2">&</span><span class="self">self</span>.filter) |
| .finish() |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Builder { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">if </span><span class="self">self</span>.built { |
| f.debug_struct(<span class="string">"Logger"</span>).field(<span class="string">"built"</span>, <span class="kw-2">&</span><span class="bool-val">true</span>).finish() |
| } <span class="kw">else </span>{ |
| f.debug_struct(<span class="string">"Logger"</span>) |
| .field(<span class="string">"filter"</span>, <span class="kw-2">&</span><span class="self">self</span>.filter) |
| .field(<span class="string">"writer"</span>, <span class="kw-2">&</span><span class="self">self</span>.writer) |
| .finish() |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Attempts to initialize the global logger with an env logger. |
| /// |
| /// This should be called early in the execution of a Rust program. Any log |
| /// events that occur before initialization will be ignored. |
| /// |
| /// # Errors |
| /// |
| /// This function will fail if it is called more than once, or if another |
| /// library has already initialized a global logger. |
| </span><span class="kw">pub fn </span>try_init() -> <span class="prelude-ty">Result</span><(), SetLoggerError> { |
| try_init_from_env(Env::default()) |
| } |
| |
| <span class="doccomment">/// Initializes the global logger with an env logger. |
| /// |
| /// This should be called early in the execution of a Rust program. Any log |
| /// events that occur before initialization will be ignored. |
| /// |
| /// # Panics |
| /// |
| /// This function will panic if it is called more than once, or if another |
| /// library has already initialized a global logger. |
| </span><span class="kw">pub fn </span>init() { |
| try_init().expect(<span class="string">"env_logger::init should not be called after logger initialized"</span>); |
| } |
| |
| <span class="doccomment">/// Attempts to initialize the global logger with an env logger from the given |
| /// environment variables. |
| /// |
| /// This should be called early in the execution of a Rust program. Any log |
| /// events that occur before initialization will be ignored. |
| /// |
| /// # Examples |
| /// |
| /// Initialise a logger using the `MY_LOG` environment variable for filters |
| /// and `MY_LOG_STYLE` for writing colors: |
| /// |
| /// ``` |
| /// use env_logger::{Builder, Env}; |
| /// |
| /// # fn run() -> Result<(), Box<::std::error::Error>> { |
| /// let env = Env::new().filter("MY_LOG").write_style("MY_LOG_STYLE"); |
| /// |
| /// env_logger::try_init_from_env(env)?; |
| /// |
| /// Ok(()) |
| /// # } |
| /// # run().unwrap(); |
| /// ``` |
| /// |
| /// # Errors |
| /// |
| /// This function will fail if it is called more than once, or if another |
| /// library has already initialized a global logger. |
| </span><span class="kw">pub fn </span>try_init_from_env<<span class="lifetime">'a</span>, E>(env: E) -> <span class="prelude-ty">Result</span><(), SetLoggerError> |
| <span class="kw">where |
| </span>E: Into<Env<<span class="lifetime">'a</span>>>, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>builder = Builder::from_env(env); |
| |
| builder.try_init() |
| } |
| |
| <span class="doccomment">/// Initializes the global logger with an env logger from the given environment |
| /// variables. |
| /// |
| /// This should be called early in the execution of a Rust program. Any log |
| /// events that occur before initialization will be ignored. |
| /// |
| /// # Examples |
| /// |
| /// Initialise a logger using the `MY_LOG` environment variable for filters |
| /// and `MY_LOG_STYLE` for writing colors: |
| /// |
| /// ``` |
| /// use env_logger::{Builder, Env}; |
| /// |
| /// let env = Env::new().filter("MY_LOG").write_style("MY_LOG_STYLE"); |
| /// |
| /// env_logger::init_from_env(env); |
| /// ``` |
| /// |
| /// # Panics |
| /// |
| /// This function will panic if it is called more than once, or if another |
| /// library has already initialized a global logger. |
| </span><span class="kw">pub fn </span>init_from_env<<span class="lifetime">'a</span>, E>(env: E) |
| <span class="kw">where |
| </span>E: Into<Env<<span class="lifetime">'a</span>>>, |
| { |
| try_init_from_env(env) |
| .expect(<span class="string">"env_logger::init_from_env should not be called after logger initialized"</span>); |
| } |
| |
| <span class="doccomment">/// Create a new builder with the default environment variables. |
| /// |
| /// The builder can be configured before being initialized. |
| /// This is a convenient way of calling [`Builder::from_default_env`]. |
| /// |
| /// [`Builder::from_default_env`]: struct.Builder.html#method.from_default_env |
| </span><span class="kw">pub fn </span>builder() -> Builder { |
| Builder::from_default_env() |
| } |
| |
| <span class="doccomment">/// Create a builder from the given environment variables. |
| /// |
| /// The builder can be configured before being initialized. |
| </span><span class="attribute">#[deprecated( |
| since = <span class="string">"0.8.0"</span>, |
| note = <span class="string">"Prefer `env_logger::Builder::from_env()` instead." |
| </span>)] |
| </span><span class="kw">pub fn </span>from_env<<span class="lifetime">'a</span>, E>(env: E) -> Builder |
| <span class="kw">where |
| </span>E: Into<Env<<span class="lifetime">'a</span>>>, |
| { |
| Builder::from_env(env) |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>env_get_filter_reads_from_var_if_set() { |
| env::set_var(<span class="string">"env_get_filter_reads_from_var_if_set"</span>, <span class="string">"from var"</span>); |
| |
| <span class="kw">let </span>env = Env::new().filter_or(<span class="string">"env_get_filter_reads_from_var_if_set"</span>, <span class="string">"from default"</span>); |
| |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">"from var"</span>.to_owned()), env.get_filter()); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>env_get_filter_reads_from_default_if_var_not_set() { |
| env::remove_var(<span class="string">"env_get_filter_reads_from_default_if_var_not_set"</span>); |
| |
| <span class="kw">let </span>env = Env::new().filter_or( |
| <span class="string">"env_get_filter_reads_from_default_if_var_not_set"</span>, |
| <span class="string">"from default"</span>, |
| ); |
| |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">"from default"</span>.to_owned()), env.get_filter()); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>env_get_write_style_reads_from_var_if_set() { |
| env::set_var(<span class="string">"env_get_write_style_reads_from_var_if_set"</span>, <span class="string">"from var"</span>); |
| |
| <span class="kw">let </span>env = |
| Env::new().write_style_or(<span class="string">"env_get_write_style_reads_from_var_if_set"</span>, <span class="string">"from default"</span>); |
| |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">"from var"</span>.to_owned()), env.get_write_style()); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>env_get_write_style_reads_from_default_if_var_not_set() { |
| env::remove_var(<span class="string">"env_get_write_style_reads_from_default_if_var_not_set"</span>); |
| |
| <span class="kw">let </span>env = Env::new().write_style_or( |
| <span class="string">"env_get_write_style_reads_from_default_if_var_not_set"</span>, |
| <span class="string">"from default"</span>, |
| ); |
| |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">"from default"</span>.to_owned()), env.get_write_style()); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>builder_parse_env_overrides_existing_filters() { |
| env::set_var( |
| <span class="string">"builder_parse_default_env_overrides_existing_filters"</span>, |
| <span class="string">"debug"</span>, |
| ); |
| <span class="kw">let </span>env = Env::new().filter(<span class="string">"builder_parse_default_env_overrides_existing_filters"</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>builder = Builder::new(); |
| builder.filter_level(LevelFilter::Trace); |
| <span class="comment">// Overrides global level to debug |
| </span>builder.parse_env(env); |
| |
| <span class="macro">assert_eq!</span>(builder.filter.build().filter(), LevelFilter::Debug); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="env_logger" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |