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annotate src/logging.rs @ 132:0b6a17f8c894 default tip

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Get constant test working again with OpenPAM.
author Paul Fisher <paul@pfish.zone>
date Wed, 02 Jul 2025 02:34:29 -0400
parents 80c07e5ab22f
children
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rev   line source
92
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1 //! PAM logging variables and macros.
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2 //!
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3 //! PAM implementations usually include the ability to log to syslog in a way
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4 //! that is associated with the log entry itself. This module defines the enums
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5 //! and macros for logging.
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6 //!
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7 //! For more details, see [`PamShared::log`](crate::PamShared::log).
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8 //!
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9 //! We can't use [the `log` crate](https://docs.rs/log) because that requires
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10 //! that any `Log` implementors be `Sync` and `Send`, and a PAM handle
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11 //! may be neither. Furthermore, PAM handles are passed to PAM modules in
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12 //! dynamic libraries, and `log` doesn't work across dynamic linking boundaries.
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13 //!
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14 //! A `PamShared` implementation may still use the `log` crate on the backend,
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15 //! and may even itself implement `log::Log`, but that interface is not exposed
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16 //! to the generic PAM user.
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17
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18 use libpam_sys::cfg_pam_impl;
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19
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20 #[cfg_pam_impl("OpenPam")]
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21 mod levels {
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22 pub const ERROR: i32 = libpam_sys::PAM_LOG_ERROR;
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23 pub const WARN: i32 = libpam_sys::PAM_LOG_NOTICE;
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24 pub const INFO: i32 = libpam_sys::PAM_LOG_VERBOSE;
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25 pub const DEBUG: i32 = libpam_sys::PAM_LOG_DEBUG;
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26 }
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27 #[cfg_pam_impl(not("OpenPam"))]
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28 mod levels {
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29 pub const ERROR: i32 = libc::LOG_ERR;
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30 pub const WARN: i32 = libc::LOG_WARNING;
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31 pub const INFO: i32 = libc::LOG_INFO;
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32 pub const DEBUG: i32 = libc::LOG_DEBUG;
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33 }
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34
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35 /// An entry to be added to the log.
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36 ///
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37 /// The levels are in descending order of importance and correspond roughly
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38 /// to the similarly-named levels in the `log` crate.
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39 ///
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40 /// Their values are ordered monotonically, either increasing or decreasing,
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41 /// depending upon the implementation.
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42 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
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43 #[repr(i32)]
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44 pub enum Level {
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45 Error = levels::ERROR,
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46 Warning = levels::WARN,
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47 Info = levels::INFO,
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48 Debug = levels::DEBUG,
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49 }
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50
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51 /// The location of a log entry. Use [`location!`](crate::location!) to create this.
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52 #[derive(Clone, Copy, Debug, Default)]
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53 #[non_exhaustive]
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54 pub struct Location<'a> {
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55 pub file: &'a str,
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56 pub line: u32,
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57 pub function: &'a str,
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58 }
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59
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60 impl<'a> Location<'a> {
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61 /// Creates a new location. Just use [`location!`](crate::location!) instead.
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62 pub fn new(file: &'a str, line: u32, function: &'a str) -> Self {
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63 Self {
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64 file,
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65 line,
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66 function,
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67 }
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68 }
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69 }
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70
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71 /// The [`Location`] where this macro is inserted.
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72 #[doc(hidden)]
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73 #[macro_export]
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74 macro_rules! location {
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75 () => {
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76 $crate::logging::Location::new(file!(), line!(), $crate::__function!())
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77 };
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78 }
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79
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80 /// Here's the guts of the logger thingy. You shouldn't be using this!
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81 #[doc(hidden)]
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82 #[macro_export]
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83 macro_rules! __log_internal {
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84 ($handle:expr, $level:ident, $($arg:tt)+) => {
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85 $handle.log($crate::logging::Level::$level, $crate::location!(), &format!($($arg)+));
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86 }
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87 }
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88
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89 /// Ugly, hacky macro to get the current function name.
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90 ///
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91 /// [Stolen from Stack Overflow.][https://stackoverflow.com/a/40234666/39808]
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92 #[doc(hidden)]
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93 #[macro_export]
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94 macro_rules! __function {
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95 () => {{
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96 fn p() {}
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97 fn f<T>(_: T) -> &'static str {
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98 ::std::any::type_name::<T>()
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99 }
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100 f(p).trim_end_matches("::p")
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101 }};
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102 }
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103
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104 /// Logs a message at error level via the given PAM handle.
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105 ///
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106 /// This supports `format!`-style formatting.
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107 ///
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108 /// # Example
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109 ///
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110 /// ```no_run
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111 /// # fn _test(pam_handle: impl nonstick::PamShared) {
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112 /// # let load_error = "xxx";
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113 /// nonstick::error!(
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114 /// pam_handle,
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115 /// "error loading data from data source: {load_error}"
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116 /// );
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117 /// // Will log a message like "error loading data from data source: timed out"
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118 /// // at ERROR level on syslog.
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119 /// # }
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120 /// ```
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121 #[macro_export]
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122 macro_rules! error { ($handle:expr, $($arg:tt)+) => { $crate::__log_internal!($handle, Error, $($arg)+);}}
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123
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124 /// Logs a message at warning level via the given PAM handle.
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125 ///
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126 /// This supports `format!`-style formatting.
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127 ///
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128 /// # Example
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129 ///
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130 /// ```no_run
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131 /// # fn _test(pam_handle: impl nonstick::PamShared) {
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132 /// # let (start, finish) = (0, 0);
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133 /// nonstick::warn!(
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134 /// pam_handle,
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135 /// "loading took too long: {latency_ms} ms",
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136 /// latency_ms = start - finish
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137 /// );
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138 /// // Will log a message like "loading took too long: 495 ms"
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139 /// // at WARN level on syslog.
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140 /// # }
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141 /// ```
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142 #[macro_export]
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143 macro_rules! warn { ($handle:expr, $($arg:tt)+) => { $crate::__log_internal!($handle, Warning, $($arg)+);}}
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144
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145 /// Logs a message at info level via the given PAM handle.
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146 ///
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147 /// This supports `format!`-style formatting.
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148 ///
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149 /// # Example
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150 ///
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151 /// ```no_run
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152 /// # fn _test(pam_handle: impl nonstick::PamShared) {
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153 /// nonstick::info!(pam_handle, "using remote backend to load user data");
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154 /// // Will log a message like "using remote backend to load user data"
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155 /// // at INFO level on syslog.
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156 /// # }
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157 /// ```
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158 #[macro_export]
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159 macro_rules! info { ($handle:expr, $($arg:tt)+) => { $crate::__log_internal!($handle, Info, $($arg)+);}}
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160
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161 /// Logs a message at debug level via the given PAM handle.
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162 ///
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163 /// This level specially includes file/line/column information.
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164 /// This supports `format!`-style formatting.
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165 ///
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166 /// # Example
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167 ///
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168 /// ```no_run
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169 /// # fn _test(pam_handle: impl nonstick::PamShared) {
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170 /// # let userinfo_url = "https://zombo.com/";
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171 /// nonstick::debug!(pam_handle, "making HTTP GET request to {userinfo_url}");
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172 /// // Will log a message like
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173 /// // making HTTP GET request to https://zombo.com/"
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174 /// // at DEBUG level on syslog.
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175 /// # }
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176 /// ```
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177 #[macro_export]
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178 macro_rules! debug { ($handle:expr, $($arg:tt)+) => { $crate::__log_internal!($handle, Debug, $($arg)+);}}
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179
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180 #[cfg(test)]
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181 mod tests {
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182 use super::*;
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183 use std::cell::RefCell;
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184
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185 #[test]
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186 fn test_logging() {
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187 struct Logger(RefCell<Vec<(Level, String)>>);
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188
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189 impl Logger {
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190 fn log(&self, level: Level, _: Location<'_>, text: &str) {
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191 self.0.borrow_mut().push((level, text.to_owned()))
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192 }
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193 }
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194
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195 let logger = Logger(Default::default());
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196
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197 let something = Level::Error;
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198 error!(logger, "here is another thing: {}", 99);
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199 warn!(logger, "watch out!");
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200 info!(logger, "here is some info: {info}", info = "information");
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201 debug!(logger, "here is something: {something:?}");
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202
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203 let logged = logger.0.into_inner();
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204
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205 assert_eq!(
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206 vec![
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207 (Level::Error, "here is another thing: 99".to_owned()),
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208 (Level::Warning, "watch out!".to_owned()),
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209 (Level::Info, "here is some info: information".to_owned()),
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210 (Level::Debug, "here is something: Error".to_owned()),
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211 ],
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212 logged
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213 );
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214 }
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215 }