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//! # `android-logd-logger` //! //! This logger writes logs to the Android `logd`, a system service with //! multiple ringbuffers for logs and evens. This is normally done //! via `liblog` (a native Android lib). Instead of using `liblog`, this crate //! writes directly to the `logd` socket with the trivial protocol below. //! This logger is written in pure Rust without any need for ffi. //! //! [log]: https://docs.rs/log/*/log/ //! [`error!`]: https://docs.rs/log/*/log/macro.error.html //! [`warn!`]: https://docs.rs/log/*/log/macro.warn.html //! [`info!`]: https://docs.rs/log/*/log/macro.info.html //! [`debug!`]: https://docs.rs/log/*/log/macro.debug.html //! [`trace!`]: https://docs.rs/log/*/log/macro.trace.html //! //! On non Android system the log output is printed to stdout in the default //! format of `logcat`. //! //! # Usage //! //! Add this to your Cargo.toml //! //! ```toml //! [dependencies] //! android-logd-logger = "0.1.2" //! ``` //! Initialize the logger with a fixed `tag` and the module path included //! in the log payload. //! //! ``` //! # use log::*; //! //! fn main() { //! android_logd_logger::builder() //! .parse_filters("debug") //! .tag("log_tag") //! .prepend_module(true) //! .init(); //! //! trace!("trace message: is not logged"); //! debug!("debug message"); //! info!("info message"); //! warn!("warn message"); //! error!("error message"); //! } //! //! ``` //! //! # Configuration //! //! Writing to the logd socket is a single point of synchronization for threads. //! The `android-logd-logger` can be configured with the `tls` feature to maintain //! one socket per thread *or* use a single socket for the whole process. //! Use the features `tls` if you want less interference between threads but pay //! for one connection per thread. //! //! # License //! //! Licensed under either of //! //! * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0) //! * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT) #![deny(missing_docs)] use env_logger::filter::{Builder as FilterBuilder, Filter}; #[cfg(all(feature = "shared", not(feature = "tls"), target_os = "android"))] use lazy_static::lazy_static; use log::{LevelFilter, Log, Metadata, SetLoggerError}; use std::{fmt, io}; #[cfg(target_os = "android")] use {bytes::BufMut, std::os::unix::net::UnixDatagram}; #[cfg(target_os = "android")] const LOGDW: &str = "/dev/socket/logdw"; #[cfg(all(feature = "tls", not(feature = "shared"), target_os = "android"))] thread_local! { static SOCKET: UnixDatagram = { let socket = UnixDatagram::unbound().expect("Failed to create socket"); socket.connect(LOGDW).expect("Failed to connect to /dev/socket/logdw"); socket }; } #[cfg(all(feature = "shared", not(feature = "tls"), target_os = "android"))] lazy_static! { static ref SOCKET: UnixDatagram = { let socket = UnixDatagram::unbound().expect("Failed to create socket"); socket.connect(LOGDW).expect("Failed to connect to /dev/socket/logdw"); socket }; } mod thread { #[cfg(unix)] #[inline] pub fn id() -> usize { unsafe { libc::pthread_self() as usize } } #[cfg(windows)] #[inline] pub fn id() -> usize { unsafe { winapi::um::processthreadsapi::GetCurrentThreadId() as usize } } #[cfg(target_os = "redox")] #[inline] pub fn id() -> usize { // Each thread has a separate pid on Redox. syscall::getpid().unwrap() } } //#[cfg(target_os = "android")] /// Log priority as defined by logd #[derive(Clone, Copy, Debug)] #[repr(u8)] enum Priority { _Unknown = 0, _Default = 1, Verbose = 2, Debug = 3, Info = 4, Warn = 5, Error = 6, _Fatal = 7, _Silent = 8, } impl std::fmt::Display for Priority { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { let c = match self { Priority::_Unknown => 'U', Priority::_Default | Priority::Debug => 'D', Priority::Verbose => 'V', Priority::Info => 'I', Priority::Warn => 'W', Priority::Error => 'E', Priority::_Fatal => 'F', Priority::_Silent => 'S', }; f.write_str(&c.to_string()) } } impl From<log::Level> for Priority { fn from(l: log::Level) -> Priority { match l { log::Level::Error => Priority::Error, log::Level::Warn => Priority::Warn, log::Level::Info => Priority::Info, log::Level::Debug => Priority::Debug, log::Level::Trace => Priority::Verbose, } } } /// Log buffer ids #[derive(Clone, Copy, Debug)] #[repr(u8)] pub enum Buffer { /// Main Buffer with id 0 Main, /// Radio Buffer with id 1 Radio, /// Event Buffer with id 2 Events, /// System Buffer with id 3 System, /// Crash Buffer with id 4 Crash, /// Kernel Buffer with id 5 Kernel, /// User defined Buffer Custom(u8), } impl From<Buffer> for u8 { fn from(b: Buffer) -> u8 { match b { Buffer::Main => 0, Buffer::Radio => 1, Buffer::Events => 2, Buffer::System => 3, Buffer::Crash => 4, Buffer::Kernel => 5, Buffer::Custom(id) => id, } } } /// Builder for initializing logger /// /// The builder is used to initialize the logging framework for later use. /// It provides #[derive(Default)] pub struct Builder<'a> { filter: FilterBuilder, tag: Option<&'a str>, prepend_module: Option<bool>, buffer: Option<Buffer>, } impl<'a> Builder<'a> { /// Initializes the log builder with defaults. /// /// # Examples /// /// Create a new builder and configure filters and style: /// /// ``` /// # use log::LevelFilter; /// # use android_logd_logger::Builder; /// /// let mut builder = Builder::new(); /// /// builder.filter(None, LevelFilter::Info) /// .init(); /// ``` /// /// [`filter`]: #method.filter pub fn new() -> Builder<'a> { Builder::default() } /// Use a specific android log buffer. Defaults to the main buffer /// is used as tag (if present) /// /// # Examples /// /// ``` /// # use android_logd_logger::Builder; /// # use android_logd_logger::Buffer; /// /// let mut builder = Builder::new(); /// /// builder.buffer(Buffer::Crash) /// .init(); /// ``` pub fn buffer(&mut self, buffer: Buffer) -> &mut Self { self.buffer = Some(buffer); self } /// Use a specific log tag. If no tag is set the module path /// is used as tag (if present) /// /// # Examples /// /// ``` /// # use android_logd_logger::Builder; /// /// let mut builder = Builder::new(); /// /// builder.tag("foo") /// .init(); /// ``` pub fn tag(&mut self, tag: &'a str) -> &mut Self { self.tag = Some(tag); self } /// Prepend module to log message. If set true the Rust module path /// is prepended to the log message. /// /// # Examples /// /// ``` /// # use android_logd_logger::Builder; /// /// let mut builder = Builder::new(); /// /// builder.prepend_module(true) /// .init(); /// ``` pub fn prepend_module(&mut self, prepend: bool) -> &mut Self { self.prepend_module = Some(prepend); self } /// Adds a directive to the filter for a specific module. /// /// # Examples /// /// Only include messages for warning and above for logs in `path::to::module`: /// /// ``` /// # use log::LevelFilter; /// # use android_logd_logger::Builder; /// /// let mut builder = Builder::new(); /// /// builder.filter_module("path::to::module", LevelFilter::Info); /// ``` pub fn filter_module(&mut self, module: &str, level: LevelFilter) -> &mut Self { self.filter.filter_module(module, level); self } /// Adds a directive to the filter for all modules. /// /// # Examples /// /// Only include messages for warning and above for logs in `path::to::module`: /// /// ``` /// # use log::LevelFilter; /// # use android_logd_logger::Builder; /// /// let mut builder = Builder::new(); /// /// builder.filter_level(LevelFilter::Info); /// ``` pub fn filter_level(&mut self, level: LevelFilter) -> &mut Self { self.filter.filter_level(level); self } /// Adds filters to the logger. /// /// The given module (if any) will log at most the specified level provided. /// If no module is provided then the filter will apply to all log messages. /// /// # Examples /// /// Only include messages for warning and above for logs in `path::to::module`: /// /// ``` /// # use log::LevelFilter; /// # use android_logd_logger::Builder; /// /// let mut builder = Builder::new(); /// /// builder.filter(Some("path::to::module"), LevelFilter::Info); /// ``` pub fn filter(&mut self, module: Option<&str>, level: LevelFilter) -> &mut Self { self.filter.filter(module, level); self } /// Parses the directives string in the same form as the `RUST_LOG` /// environment variable. /// /// See the module documentation for more details. pub fn parse_filters(&mut self, filters: &str) -> &mut Self { self.filter.parse(filters); self } /// Initializes the global logger with the built logd logger. /// /// This should be called early in the execution of a Rust program. Any log /// events that occur before initialization will be ignored. /// /// # Errors /// /// This function will fail if it is called more than once, or if another /// library has already initialized a global logger. pub fn try_init(&mut self) -> Result<(), SetLoggerError> { let logger = self.build(); let max_level = logger.filter.filter(); let r = log::set_boxed_logger(Box::new(logger)); if r.is_ok() { log::set_max_level(max_level); } r } /// Initializes the global logger with the built logger. /// /// This should be called early in the execution of a Rust program. Any log /// events that occur before initialization will be ignored. /// /// # Panics /// /// This function will panic if it is called more than once, or if another /// library has already initialized a global logger. pub fn init(&mut self) { self.try_init() .expect("Builder::init should not be called after logger initialized"); } fn build(&mut self) -> Logger { let buffer = self.buffer.unwrap_or(Buffer::Main); let filter = self.filter.build(); let prepend_module = self.prepend_module.unwrap_or(false); Logger::new(buffer, filter, self.tag.map(str::to_string), prepend_module).expect("Failed to build logger") } } struct Logger { filter: Filter, tag: Option<String>, prepend_module: bool, _buffer_id: Buffer, } impl Logger { pub fn new(buffer_id: Buffer, filter: Filter, tag: Option<String>, prepend_module: bool) -> Result<Logger, io::Error> { Ok(Logger { filter, tag, prepend_module, _buffer_id: buffer_id, }) } } impl Log for Logger { fn enabled(&self, metadata: &Metadata) -> bool { self.filter.enabled(metadata) } fn log(&self, record: &log::Record) { if !self.filter.matches(record) { return; } let args = record.args().to_string(); let message = if let Some(module_path) = record.module_path() { if self.prepend_module { let mut message = String::with_capacity(module_path.len() + args.len()); message.push_str(module_path); message.push_str(": "); message.push_str(&args); message } else { args } } else { args }; let priority: Priority = record.metadata().level().into(); #[cfg(target_os = "android")] { let timestamp = std::time::SystemTime::now(); let tag = if let Some(ref tag) = self.tag { tag } else { record.module_path().unwrap_or_default() }; let tag_len = tag.bytes().len() + 1; let message_len = message.bytes().len() + 1; let mut buffer = bytes::BytesMut::with_capacity(12 + tag_len + message_len); buffer.put_u8(self._buffer_id.into()); buffer.put_u16_le(thread::id() as u16); let timestamp = timestamp .duration_since(std::time::UNIX_EPOCH) .expect("Failed to aquire time"); buffer.put_u32_le(timestamp.as_secs() as u32); buffer.put_u32_le(timestamp.subsec_nanos()); buffer.put_u8(priority as u8); buffer.put(tag.as_bytes()); buffer.put_u8(0); buffer.put(message.as_bytes()); buffer.put_u8(0); #[cfg(all(feature = "tls", not(feature = "shared"), target_os = "android"))] SOCKET.with(|f| f.send(&buffer).expect("Logd socket error")); #[cfg(all(feature = "shared", not(feature = "tls"), target_os = "android"))] SOCKET.send(&buffer).expect("Logd socket error"); } #[cfg(not(target_os = "android"))] { let datetime = ::time::OffsetDateTime::now_utc(); let tag = if let Some(ref tag) = self.tag { tag } else { record.module_path().unwrap_or_default() }; println!( "{}.{} {} {} {} {}: {}", datetime.format("%Y-%m-%d %T"), &datetime.format("%N")[..3], std::process::id(), thread::id(), priority, tag, message ); } } #[cfg(not(target_os = "android"))] fn flush(&self) { use std::io::Write; io::stdout().flush().ok(); } #[cfg(target_os = "android")] fn flush(&self) {} } /// Returns a default [`Builder`] for configuration and initialization of logging. /// /// With the help of the [`Builder`] the logging is configured. /// The tag, filter and buffer can be set. /// Additionally it is possible to set whether the modul path appears in a log message. /// /// After a call to [`init`](Builder::init) the global logger is initialized with the configuration. pub fn builder<'a>() -> Builder<'a> { Builder::default() }