captains_log/
config.rs

1use crate::log_impl::setup_log;
2use crate::{
3    formatter::{FormatRecord, TimeFormatter},
4    log_impl::{LogSink, LogSinkTrait},
5    time::Timer,
6};
7use log::{Level, LevelFilter, Record};
8use std::hash::{DefaultHasher, Hash, Hasher};
9use std::path::Path;
10
11/// Global config to setup logger
12/// See crate::recipe for usage
13#[derive(Default)]
14pub struct Builder {
15    /// When dynamic==true,
16    ///   Can safely re-initialize GlobalLogger even it exists,
17    ///   useful to setup different types of logger in test suits.
18    /// When dynamic==false,
19    ///   Only initialize once, logger sinks setting cannot be change afterwards.
20    ///   More efficient for production environment.
21    pub dynamic: bool,
22
23    /// Listen for signal of log-rotate
24    /// NOTE: Once logger started to listen signal, does not support dynamic reconfigure.
25    pub rotation_signals: Vec<i32>,
26
27    /// Hookup to log error when panic
28    pub panic: bool,
29
30    /// Whether to exit program after panic
31    pub continue_when_panic: bool,
32
33    /// Different types of log sink
34    pub(crate) sinks: Vec<Box<dyn SinkConfigTrait>>,
35}
36
37impl Builder {
38    pub fn new() -> Self {
39        Self::default()
40    }
41
42    /// For test cases, set dynamic=true and turn Off signal.
43    /// Call this with pre-set recipe for convenient.
44    pub fn test(mut self) -> Self {
45        self.dynamic = true;
46        self.rotation_signals.clear();
47        self
48    }
49
50    /// Add log-rotate signal
51    pub fn signal(mut self, signal: i32) -> Self {
52        self.rotation_signals.push(signal);
53        self
54    }
55
56    /// Add different types of log sink config, can be called multiple times.
57    pub fn add_sink<S: SinkConfigTrait>(mut self, config: S) -> Self {
58        self.sinks.push(Box::new(config));
59        self
60    }
61
62    /// Return the max log level in the log sinks
63    pub fn get_max_level(&self) -> LevelFilter {
64        let mut max_level = Level::Error;
65        for sink in &self.sinks {
66            let level = sink.get_level();
67            if level > max_level {
68                max_level = level;
69            }
70        }
71        return max_level.to_level_filter();
72    }
73
74    /// Calculate checksum of the setting for init() comparison
75    pub(crate) fn cal_checksum(&self) -> u64 {
76        let mut hasher = Box::new(DefaultHasher::new()) as Box<dyn Hasher>;
77        self.dynamic.hash(&mut hasher);
78        self.rotation_signals.hash(&mut hasher);
79        self.panic.hash(&mut hasher);
80        self.continue_when_panic.hash(&mut hasher);
81        for sink in &self.sinks {
82            sink.write_hash(&mut hasher);
83        }
84        hasher.finish()
85    }
86
87    pub(crate) fn build_sinks(&self) -> Result<Vec<LogSink>, ()> {
88        let mut sinks = Vec::new();
89        for config in &self.sinks {
90            let logger_sink = config.build();
91            if let Err(e) = logger_sink.open() {
92                eprintln!("failed to open log sink: {:?}", e);
93                return Err(());
94            }
95            sinks.push(logger_sink);
96        }
97        Ok(sinks)
98    }
99
100    /// Setup global logger.
101    /// Equals to setup_log(builder)
102    ///
103    /// **NOTE**: You can call this function multiple times when **builder.dynamic=true**,
104    /// but **cannot mixed used captains_log with other logger implement**, because log::set_logger()
105    /// cannot be called twice.
106    pub fn build(self) -> Result<(), ()> {
107        setup_log(self)
108    }
109}
110
111pub(crate) trait SinkConfigBuild {
112    /// Build an actual sink from config
113    fn build(&self) -> LogSink;
114}
115
116#[allow(private_bounds)]
117pub trait SinkConfigTrait: 'static + SinkConfigBuild {
118    /// get max log level of the sink
119    fn get_level(&self) -> Level;
120    /// Only file sink has path
121    #[allow(dead_code)]
122    fn get_file_path(&self) -> Option<Box<Path>>;
123    /// Calculate hash for config comparison
124    fn write_hash(&self, hasher: &mut Box<dyn Hasher>);
125}
126
127pub type FormatFunc = fn(FormatRecord) -> String;
128
129/// Custom formatter which adds into a log sink
130#[derive(Clone, Hash)]
131pub struct LogFormat {
132    time_fmt: &'static str,
133    format_fn: FormatFunc,
134}
135
136impl LogFormat {
137    /// # Arguments
138    ///
139    /// time_fmt: refer to chrono::format::strftime.
140    ///
141    /// format_fn:
142    /// Since std::fmt only support compile time format,
143    /// you have to write a static function to format the log line
144    ///
145    /// # Example
146    /// ```
147    /// use captains_log::{LogRawFile, LogFormat, FormatRecord};
148    /// fn format_f(r: FormatRecord) -> String {
149    ///     let time = r.time();
150    ///     let level = r.level();
151    ///     let msg = r.msg();
152    ///     let req_id = r.key("req_id");
153    ///     format!("[{time}][{level}] {msg}{req_id}\n").to_string()
154    /// }
155    /// let log_format = LogFormat::new("%Y-%m-%d %H:%M:%S%.6f", format_f);
156    /// let log_sink = LogRawFile::new("/tmp", "test.log", log::Level::Info, log_format);
157    /// ```
158
159    pub const fn new(time_fmt: &'static str, format_fn: FormatFunc) -> Self {
160        Self { time_fmt, format_fn }
161    }
162
163    #[inline(always)]
164    pub(crate) fn process(&self, now: &Timer, record: &Record) -> String {
165        let time = TimeFormatter { now, fmt_str: self.time_fmt };
166        let r = FormatRecord { record, time };
167        return (self.format_fn)(r);
168    }
169}
captains_log/config.rs

captains_log/
config.rs
