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"https://github.com/instrumentisto/medea" +# documentation = "https://docs.rs/medea" +readme = "README.md" +repository = "https://github.com/instrumentisto/medea" + +[dependencies] +chrono = "0.4" +log = "0.4" +slog = { version = "2.4", features = ["max_level_info", "release_max_level_warn"] } +slog-async = "2.3" +slog-json = "2.3" +slog-scope = "4.1" diff --git a/src/log/mod.rs b/src/log/mod.rs new file mode 100644 index 000000000..12974ba5a --- /dev/null +++ b/src/log/mod.rs @@ -0,0 +1,66 @@ +//! Provides logging utilities, used by application. + +use std::io; + +use chrono::Local; +use slog::{ + o, Drain, Duplicate, FnValue, Fuse, Level, Logger, PushFnValue, Record, +}; +use slog_async::Async; +use slog_json::Json; + +pub mod prelude; + +/// Builds JSON [`Logger`] which prints all its log records to `w_out` writer, +/// but WARN level (and higher) to `w_err` writer. +/// +/// Created [`Logger`] produces log records with `lvl`, `time` and `msg` fields +/// by default. +pub fn new_dual_logger(w_out: W1, w_err: W2) -> Logger +where + W1: io::Write + Send + 'static, + W2: io::Write + Send + 'static, +{ + let drain_out = Json::new(w_out).build(); + let drain_err = Json::new(w_err).build(); + let drain = Duplicate( + drain_out.filter(|r| !r.level().is_at_least(Level::Warning)), + drain_err.filter_level(Level::Warning), + ) + .map(Fuse); + let drain = Async::new(drain).build().fuse(); + add_default_keys(Logger::root(drain, o!())) +} + +/// Builds JSON [`Logger`] which writes all its logs to the specified writer. +/// +/// Created [`Logger`] produces log records with `lvl`, `time` and `msg` fields +/// by default. +pub fn new_logger(w: W) -> Logger +where + W: io::Write + Send + 'static, +{ + let drain = Json::new(w).build().fuse(); + let drain = Async::new(drain).build().fuse(); + add_default_keys(Logger::root(drain, o!())) +} + +/// Adds default log record data (key-value pairs) to specified [`Logger`]: +/// - `time`: creation date and time of log record in [RFC 3339] format. +/// - `lvl`: logging level of log record. +/// - `msg`: log record message. +/// +/// [RFC 3339]: https://www.ietf.org/rfc/rfc3339.txt +fn add_default_keys(logger: Logger) -> Logger { + logger.new(o!( + "msg" => PushFnValue(move |record : &Record, ser| { + ser.emit(record.msg()) + }), + "time" => PushFnValue(move |_ : &Record, ser| { + ser.emit(Local::now().to_rfc3339()) + }), + "lvl" => FnValue(move |rinfo : &Record| { + rinfo.level().as_str() + }), + )) +} diff --git a/src/log/prelude.rs b/src/log/prelude.rs new file mode 100644 index 000000000..a09db6ec8 --- /dev/null +++ b/src/log/prelude.rs @@ -0,0 +1,9 @@ +//! Re-exports common definitions for logging. +//! +//! Use this module as following: +//! ```rust +//! use crate::log::prelude::*; +//! ``` + +pub use slog::{slog_debug, slog_error, slog_info, slog_trace, slog_warn}; +pub use slog_scope::{debug, error, info, trace, warn}; diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 000000000..5acb346eb --- /dev/null +++ b/src/main.rs @@ -0,0 +1,11 @@ +use crate::log::prelude::*; + +mod log; + +fn main() { + let logger = log::new_dual_logger(std::io::stdout(), std::io::stderr()); + let _scope_guard = slog_scope::set_global_logger(logger); + + info!("Hooray!"); + warn!("It works"); +}