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
//! Rocket's logging infrastructure.

use std::{fmt, env};
use std::str::FromStr;

use log;
use yansi::Paint;

pub(crate) const COLORS_ENV: &str = "ROCKET_CLI_COLORS";

struct RocketLogger(LoggingLevel);

/// Defines the different levels for log messages.
#[derive(PartialEq, Eq, Debug, Clone, Copy)]
pub enum LoggingLevel {
    /// Only shows errors, warnings, and launch information.
    Critical,
    /// Shows everything except debug and trace information.
    Normal,
    /// Shows everything.
    Debug,
    /// Shows nothing.
    Off,
}

impl LoggingLevel {
    #[inline(always)]
    fn to_level_filter(self) -> log::LevelFilter {
        match self {
            LoggingLevel::Critical => log::LevelFilter::Warn,
            LoggingLevel::Normal => log::LevelFilter::Info,
            LoggingLevel::Debug => log::LevelFilter::Trace,
            LoggingLevel::Off => log::LevelFilter::Off
        }
    }
}

impl FromStr for LoggingLevel {
    type Err = &'static str;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let level = match s {
            "critical" => LoggingLevel::Critical,
            "normal" => LoggingLevel::Normal,
            "debug" => LoggingLevel::Debug,
            "off" => LoggingLevel::Off,
            _ => return Err("a log level (off, debug, normal, critical)")
        };

        Ok(level)
    }
}

impl fmt::Display for LoggingLevel {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let string = match *self {
            LoggingLevel::Critical => "critical",
            LoggingLevel::Normal => "normal",
            LoggingLevel::Debug => "debug",
            LoggingLevel::Off => "off"
        };

        write!(f, "{}", string)
    }
}

#[doc(hidden)] #[macro_export]
macro_rules! log_ { ($name:ident: $($args:tt)*) => { $name!(target: "_", $($args)*) }; }
#[doc(hidden)] #[macro_export]
macro_rules! launch_info { ($($args:tt)*) => { info!(target: "launch", $($args)*) } }
#[doc(hidden)] #[macro_export]
macro_rules! launch_info_ { ($($args:tt)*) => { info!(target: "launch_", $($args)*) } }
#[doc(hidden)] #[macro_export]
macro_rules! error_ { ($($args:expr),+) => { log_!(error: $($args),+) }; }
#[doc(hidden)] #[macro_export]
macro_rules! info_ { ($($args:expr),+) => { log_!(info: $($args),+) }; }
#[doc(hidden)] #[macro_export]
macro_rules! trace_ { ($($args:expr),+) => { log_!(trace: $($args),+); }; }
#[doc(hidden)] #[macro_export]
macro_rules! debug_ { ($($args:expr),+) => { log_!(debug: $($args),+); }; }
#[doc(hidden)] #[macro_export]
macro_rules! warn_ { ($($args:expr),+) => { log_!(warn: $($args),+) }; }

impl log::Log for RocketLogger {
    #[inline(always)]
    fn enabled(&self, record: &log::Metadata) -> bool {
        match self.0.to_level_filter().to_level() {
            Some(max) => record.level() <= max || record.target().starts_with("launch"),
            None => false
        }
    }

    fn log(&self, record: &log::Record) {
        // Print nothing if this level isn't enabled and this isn't launch info.
        if !self.enabled(record.metadata()) {
            return;
        }

        // Don't print Hyper or Rustls messages unless debug is enabled.
        let configged_level = self.0;
        let from_hyper = record.module_path().map_or(false, |m| m.starts_with("hyper::"));
        let from_rustls = record.module_path().map_or(false, |m| m.starts_with("rustls::"));
        if configged_level != LoggingLevel::Debug && (from_hyper || from_rustls) {
            return;
        }

        // In Rocket, we abuse targets with suffix "_" to indicate indentation.
        let is_launch = record.target().starts_with("launch");
        if record.target().ends_with('_') {
            if configged_level != LoggingLevel::Critical || is_launch {
                print!("    {} ", Paint::default("=>").bold());
            }
        }

        match record.level() {
            log::Level::Info => println!("{}", Paint::blue(record.args()).wrap()),
            log::Level::Trace => println!("{}", Paint::magenta(record.args()).wrap()),
            log::Level::Error => {
                println!("{} {}",
                         Paint::red("Error:").bold(),
                         Paint::red(record.args()).wrap())
            }
            log::Level::Warn => {
                println!("{} {}",
                         Paint::yellow("Warning:").bold(),
                         Paint::yellow(record.args()).wrap())
            }
            log::Level::Debug => {
                print!("\n{} ", Paint::blue("-->").bold());
                if let Some(file) = record.file() {
                    print!("{}", Paint::blue(file));
                }

                if let Some(line) = record.line() {
                    println!(":{}", Paint::blue(line));
                }

                println!("{}", record.args());
            }
        }
    }

    fn flush(&self) {
        // NOOP: We don't buffer any records.
    }
}

pub(crate) fn try_init(level: LoggingLevel, verbose: bool) -> bool {
    if level == LoggingLevel::Off {
        return false;
    }

    if !::atty::is(::atty::Stream::Stdout)
        || (cfg!(windows) && !Paint::enable_windows_ascii())
        || env::var_os(COLORS_ENV).map(|v| v == "0" || v == "off").unwrap_or(false)
    {
        Paint::disable();
    }

    push_max_level(level);
    if let Err(e) = log::set_boxed_logger(Box::new(RocketLogger(level))) {
        if verbose {
            eprintln!("Logger failed to initialize: {}", e);
        }

        pop_max_level();
        return false;
    }

    true
}

use std::sync::atomic::{AtomicUsize, AtomicBool, Ordering};

static PUSHED: AtomicBool = AtomicBool::new(false);
static LAST_LOG_FILTER: AtomicUsize = AtomicUsize::new(0);

fn filter_to_usize(filter: log::LevelFilter) -> usize {
    match filter {
        log::LevelFilter::Off => 0,
        log::LevelFilter::Error => 1,
        log::LevelFilter::Warn => 2,
        log::LevelFilter::Info => 3,
        log::LevelFilter::Debug => 4,
        log::LevelFilter::Trace => 5,
    }
}

fn usize_to_filter(num: usize) -> log::LevelFilter {
    match num {
        0 => log::LevelFilter::Off,
        1 => log::LevelFilter::Error,
        2 => log::LevelFilter::Warn,
        3 => log::LevelFilter::Info,
        4 => log::LevelFilter::Debug,
        5 => log::LevelFilter::Trace,
        _ => unreachable!("max num is 5 in filter_to_usize")
    }
}

pub(crate) fn push_max_level(level: LoggingLevel) {
    LAST_LOG_FILTER.store(filter_to_usize(log::max_level()), Ordering::Release);
    PUSHED.store(true, Ordering::Release);
    log::set_max_level(level.to_level_filter());
}

pub(crate) fn pop_max_level() {
    if PUSHED.load(Ordering::Acquire) {
        log::set_max_level(usize_to_filter(LAST_LOG_FILTER.load(Ordering::Acquire)));
    }
}

#[doc(hidden)]
pub fn init(level: LoggingLevel) -> bool {
    try_init(level, true)
}

// Expose logging macros as (hidden) funcions for use by core/contrib codegen.
macro_rules! external_log_function {
    ($fn_name:ident: $macro_name:ident) => (
        #[doc(hidden)] #[inline(always)]
        pub fn $fn_name(msg: &str) { $macro_name!("{}", msg); }
    )
}

external_log_function!(error: error);
external_log_function!(error_: error_);
external_log_function!(warn: warn);
external_log_function!(warn_: warn_);