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Diffstat (limited to 'src/rust/tor_log/tor_log.rs')
| -rw-r--r-- | src/rust/tor_log/tor_log.rs | 265 |
1 files changed, 0 insertions, 265 deletions
diff --git a/src/rust/tor_log/tor_log.rs b/src/rust/tor_log/tor_log.rs deleted file mode 100644 index 391cb32ab3..0000000000 --- a/src/rust/tor_log/tor_log.rs +++ /dev/null @@ -1,265 +0,0 @@ -// Copyright (c) 2016-2019, The Tor Project, Inc. */ -// See LICENSE for licensing information */ - -// Note that these functions are untested due to the fact that there are no -// return variables to test and they are calling into a C API. - -/// The related domain which the logging message is relevant. For example, -/// log messages relevant to networking would use LogDomain::LdNet, whereas -/// general messages can use LdGeneral. -#[derive(Eq, PartialEq)] -pub enum LogDomain { - Net, - General, -} - -/// The severity level at which to log messages. -#[derive(Eq, PartialEq)] -pub enum LogSeverity { - Notice, - Warn, -} - -/// Main entry point for Rust modules to log messages. -/// -/// # Inputs -/// -/// * A `severity` of type LogSeverity, which defines the level of severity the -/// message will be logged. -/// * A `domain` of type LogDomain, which defines the domain the log message -/// will be associated with. -/// * A `function` of type &str, which defines the name of the function where -/// the message is being logged. There is a current RFC for a macro that -/// defines function names. When it is, we should use it. See -/// https://github.com/rust-lang/rfcs/pull/1719 -/// * A `message` of type &str, which is the log message itself. -#[macro_export] -macro_rules! tor_log_msg { - ($severity: path, - $domain: path, - $function: expr, - $($message:tt)*) => - { - { - let msg = format!($($message)*); - $crate::tor_log_msg_impl($severity, $domain, $function, msg) - } - }; -} - -#[inline] -pub fn tor_log_msg_impl(severity: LogSeverity, domain: LogDomain, function: &str, message: String) { - use std::ffi::CString; - - /// Default function name to log in case of errors when converting - /// a function name to a CString - const ERR_LOG_FUNCTION: &str = "tor_log_msg"; - - /// Default message to log in case of errors when converting a log - /// message to a CString - const ERR_LOG_MSG: &str = "Unable to log message from Rust \ - module due to error when converting to CString"; - - let func = match CString::new(function) { - Ok(n) => n, - Err(_) => CString::new(ERR_LOG_FUNCTION).unwrap(), - }; - - let msg = match CString::new(message) { - Ok(n) => n, - Err(_) => CString::new(ERR_LOG_MSG).unwrap(), - }; - - // Bind to a local variable to preserve ownership. This is essential so - // that ownership is guaranteed until these local variables go out of scope - let func_ptr = func.as_ptr(); - let msg_ptr = msg.as_ptr(); - - let c_severity = unsafe { log::translate_severity(severity) }; - let c_domain = unsafe { log::translate_domain(domain) }; - - unsafe { log::tor_log_string(c_severity, c_domain, func_ptr, msg_ptr) } -} - -/// This implementation is used when compiling for actual use, as opposed to -/// testing. -#[cfg(not(test))] -pub mod log { - use super::LogDomain; - use super::LogSeverity; - use libc::{c_char, c_int}; - - /// Severity log types. These mirror definitions in src/lib/log/log.h - /// C_RUST_COUPLED: src/lib/log/log.c, log domain types - extern "C" { - static LOG_WARN_: c_int; - static LOG_NOTICE_: c_int; - } - - /// Domain log types. These mirror definitions in src/lib/log/log.h - /// C_RUST_COUPLED: src/lib/log/log.c, log severity types - extern "C" { - static LD_NET_: u64; - static LD_GENERAL_: u64; - } - - /// Translate Rust definitions of log domain levels to C. This exposes a 1:1 - /// mapping between types. - #[inline] - pub unsafe fn translate_domain(domain: LogDomain) -> u64 { - match domain { - LogDomain::Net => LD_NET_, - LogDomain::General => LD_GENERAL_, - } - } - - /// Translate Rust definitions of log severity levels to C. This exposes a - /// 1:1 mapping between types. - #[inline] - pub unsafe fn translate_severity(severity: LogSeverity) -> c_int { - match severity { - LogSeverity::Warn => LOG_WARN_, - LogSeverity::Notice => LOG_NOTICE_, - } - } - - /// The main entry point into Tor's logger. When in non-test mode, this - /// will link directly with `tor_log_string` in torlog.c - extern "C" { - pub fn tor_log_string( - severity: c_int, - domain: u64, - function: *const c_char, - string: *const c_char, - ); - } -} - -/// This module exposes no-op functionality for testing other Rust modules -/// without linking to C. -#[cfg(test)] -pub mod log { - use super::LogDomain; - use super::LogSeverity; - use libc::{c_char, c_int}; - - pub static mut LAST_LOGGED_FUNCTION: *mut String = 0 as *mut String; - pub static mut LAST_LOGGED_MESSAGE: *mut String = 0 as *mut String; - - pub unsafe fn tor_log_string( - _severity: c_int, - _domain: u32, - function: *const c_char, - message: *const c_char, - ) { - use std::ffi::CStr; - - let f = CStr::from_ptr(function); - let fct = match f.to_str() { - Ok(n) => n, - Err(_) => "", - }; - LAST_LOGGED_FUNCTION = Box::into_raw(Box::new(String::from(fct))); - - let m = CStr::from_ptr(message); - let msg = match m.to_str() { - Ok(n) => n, - Err(_) => "", - }; - LAST_LOGGED_MESSAGE = Box::into_raw(Box::new(String::from(msg))); - } - - pub unsafe fn translate_domain(_domain: LogDomain) -> u32 { - 1 - } - - pub unsafe fn translate_severity(_severity: LogSeverity) -> c_int { - 1 - } -} - -#[cfg(test)] -mod test { - use tor_log::log::{LAST_LOGGED_FUNCTION, LAST_LOGGED_MESSAGE}; - use tor_log::*; - - #[test] - fn test_get_log_message() { - { - fn test_macro() { - tor_log_msg!( - LogSeverity::Warn, - LogDomain::Net, - "test_macro", - "test log message {}", - "a", - ); - } - - test_macro(); - - let function = unsafe { Box::from_raw(LAST_LOGGED_FUNCTION) }; - assert_eq!("test_macro", *function); - - let message = unsafe { Box::from_raw(LAST_LOGGED_MESSAGE) }; - assert_eq!("test log message a", *message); - } - - // test multiple inputs into the log message - { - fn test_macro() { - tor_log_msg!( - LogSeverity::Warn, - LogDomain::Net, - "next_test_macro", - "test log message {} {} {} {} {}", - 1, - 2, - 3, - 4, - 5 - ); - } - - test_macro(); - - let function = unsafe { Box::from_raw(LAST_LOGGED_FUNCTION) }; - assert_eq!("next_test_macro", *function); - - let message = unsafe { Box::from_raw(LAST_LOGGED_MESSAGE) }; - assert_eq!("test log message 1 2 3 4 5", *message); - } - - // test how a long log message will be formatted - { - fn test_macro() { - tor_log_msg!( - LogSeverity::Warn, - LogDomain::Net, - "test_macro", - "{}", - "All the world's a stage, and all the men and women \ - merely players: they have their exits and their \ - entrances; and one man in his time plays many parts, his \ - acts being seven ages." - ); - } - - test_macro(); - - let expected_string = "All the world's a \ - stage, and all the men \ - and women merely players: \ - they have their exits and \ - their entrances; and one man \ - in his time plays many parts, \ - his acts being seven ages."; - - let function = unsafe { Box::from_raw(LAST_LOGGED_FUNCTION) }; - assert_eq!("test_macro", *function); - - let message = unsafe { Box::from_raw(LAST_LOGGED_MESSAGE) }; - assert_eq!(expected_string, *message); - } - } -} |