199 lines
6.3 KiB
Rust
199 lines
6.3 KiB
Rust
// Copyright 2016 Joe Wilm, The Alacritty Project Contributors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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//! Logging for alacritty.
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//!
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//! The main executable is supposed to call `initialize()` exactly once during
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//! startup. All logging messages are written to stdout, given that their
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//! log-level is sufficient for the level configured in `cli::Options`.
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use std::env;
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use std::fs::{File, OpenOptions};
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use std::io::{self, LineWriter, Stdout, Write};
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use std::path::PathBuf;
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use std::process;
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use std::sync::atomic::{AtomicBool, Ordering};
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use std::sync::{Arc, Mutex};
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use crossbeam_channel::Sender;
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use log::{self, Level};
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use time;
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use crate::cli;
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use crate::message_bar::Message;
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use crate::term::color;
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const ALACRITTY_LOG_ENV: &str = "ALACRITTY_LOG";
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pub fn initialize(
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options: &cli::Options,
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message_tx: Sender<Message>,
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) -> Result<Option<PathBuf>, log::SetLoggerError> {
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// Use env_logger if RUST_LOG environment variable is defined. Otherwise,
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// use the alacritty-only logger.
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if ::std::env::var("RUST_LOG").is_ok() {
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::env_logger::try_init()?;
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Ok(None)
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} else {
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let logger = Logger::new(options.log_level, message_tx);
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let path = logger.file_path();
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log::set_boxed_logger(Box::new(logger))?;
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Ok(path)
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}
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}
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pub struct Logger {
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level: log::LevelFilter,
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logfile: Mutex<OnDemandLogFile>,
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stdout: Mutex<LineWriter<Stdout>>,
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message_tx: Sender<Message>,
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}
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impl Logger {
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// False positive, see: https://github.com/rust-lang-nursery/rust-clippy/issues/734
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#[allow(clippy::new_ret_no_self)]
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fn new(level: log::LevelFilter, message_tx: Sender<Message>) -> Self {
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log::set_max_level(level);
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let logfile = Mutex::new(OnDemandLogFile::new());
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let stdout = Mutex::new(LineWriter::new(io::stdout()));
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Logger { level, logfile, stdout, message_tx }
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}
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fn file_path(&self) -> Option<PathBuf> {
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if let Ok(logfile) = self.logfile.lock() {
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Some(logfile.path().clone())
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} else {
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None
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}
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}
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}
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impl log::Log for Logger {
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fn enabled(&self, metadata: &log::Metadata<'_>) -> bool {
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metadata.level() <= self.level
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}
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fn log(&self, record: &log::Record<'_>) {
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if self.enabled(record.metadata()) && record.target().starts_with("alacritty") {
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let now = time::strftime("%F %R", &time::now()).unwrap();
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let msg = if record.level() >= Level::Trace {
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format!(
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"[{}] [{}] [{}:{}] {}\n",
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now,
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record.level(),
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record.file().unwrap_or("?"),
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record.line().map(|l| l.to_string()).unwrap_or_else(|| "?".into()),
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record.args()
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)
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} else {
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format!("[{}] [{}] {}\n", now, record.level(), record.args())
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};
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if let Ok(ref mut logfile) = self.logfile.lock() {
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let _ = logfile.write_all(msg.as_ref());
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if record.level() <= Level::Warn {
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#[cfg(not(windows))]
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let env_var = format!("${}", ALACRITTY_LOG_ENV);
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#[cfg(windows)]
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let env_var = format!("%{}%", ALACRITTY_LOG_ENV);
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let msg = format!(
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"[{}] See log at {} ({}):\n{}",
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record.level(),
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logfile.path.to_string_lossy(),
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env_var,
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record.args(),
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);
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let color = match record.level() {
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Level::Error => color::RED,
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Level::Warn => color::YELLOW,
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_ => unreachable!(),
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};
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let mut message = Message::new(msg, color);
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message.set_topic(record.file().unwrap_or("?").into());
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let _ = self.message_tx.send(message);
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}
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}
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if let Ok(ref mut stdout) = self.stdout.lock() {
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let _ = stdout.write_all(msg.as_ref());
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}
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}
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}
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fn flush(&self) {}
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}
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struct OnDemandLogFile {
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file: Option<LineWriter<File>>,
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created: Arc<AtomicBool>,
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path: PathBuf,
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}
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impl OnDemandLogFile {
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fn new() -> Self {
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let mut path = env::temp_dir();
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path.push(format!("Alacritty-{}.log", process::id()));
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// Set log path as an environment variable
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env::set_var(ALACRITTY_LOG_ENV, path.as_os_str());
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OnDemandLogFile { path, file: None, created: Arc::new(AtomicBool::new(false)) }
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}
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fn file(&mut self) -> Result<&mut LineWriter<File>, io::Error> {
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// Allow to recreate the file if it has been deleted at runtime
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if self.file.is_some() && !self.path.as_path().exists() {
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self.file = None;
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}
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// Create the file if it doesn't exist yet
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if self.file.is_none() {
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let file = OpenOptions::new().append(true).create(true).open(&self.path);
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match file {
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Ok(file) => {
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self.file = Some(io::LineWriter::new(file));
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self.created.store(true, Ordering::Relaxed);
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let _ = writeln!(io::stdout(), "Created log file at {:?}", self.path);
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},
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Err(e) => {
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let _ = writeln!(io::stdout(), "Unable to create log file: {}", e);
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return Err(e);
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},
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}
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}
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Ok(self.file.as_mut().unwrap())
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}
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fn path(&self) -> &PathBuf {
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&self.path
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}
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}
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impl Write for OnDemandLogFile {
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fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error> {
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self.file()?.write(buf)
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}
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fn flush(&mut self) -> Result<(), io::Error> {
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self.file()?.flush()
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}
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}
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