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multi_writer.rs
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multi_writer.rs
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use crate::{
logger::Duplicate,
util::{eprint_err, write_buffered, ErrorCode},
writers::{FileLogWriter, FileLogWriterBuilder, FileLogWriterConfig, LogWriter},
{DeferredNow, FlexiLoggerError, FormatFunction},
};
use log::Record;
use std::{io::Write, path::PathBuf};
// The `MultiWriter` writes logs to a FileLogWriter and/or another Writer,
// and can duplicate messages to stderr or stdout.
pub(crate) struct MultiWriter {
duplicate_stderr: Duplicate,
duplicate_stdout: Duplicate,
support_capture: bool,
format_for_stderr: FormatFunction,
format_for_stdout: FormatFunction,
o_file_writer: Option<Box<FileLogWriter>>,
o_other_writer: Option<Box<dyn LogWriter>>,
}
impl MultiWriter {
pub(crate) fn new(
duplicate_stderr: Duplicate,
duplicate_stdout: Duplicate,
support_capture: bool,
format_for_stderr: FormatFunction,
format_for_stdout: FormatFunction,
o_file_writer: Option<Box<FileLogWriter>>,
o_other_writer: Option<Box<dyn LogWriter>>,
) -> Self {
MultiWriter {
duplicate_stderr,
duplicate_stdout,
support_capture,
format_for_stderr,
format_for_stdout,
o_file_writer,
o_other_writer,
}
}
pub(crate) fn reset_file_log_writer(
&self,
flwb: &FileLogWriterBuilder,
) -> Result<(), FlexiLoggerError> {
self.o_file_writer
.as_ref()
.map_or(Err(FlexiLoggerError::NoFileLogger), |flw| flw.reset(flwb))
}
pub(crate) fn flw_config(&self) -> Result<FileLogWriterConfig, FlexiLoggerError> {
self.o_file_writer
.as_ref()
.map_or(Err(FlexiLoggerError::NoFileLogger), |flw| flw.config())
}
pub(crate) fn reopen_outputfile(&self) -> Result<(), FlexiLoggerError> {
self.o_file_writer
.as_ref()
.map_or(Err(FlexiLoggerError::NoFileLogger), |flw| {
flw.reopen_outputfile()
})
}
pub(crate) fn existing_log_files(&self) -> Result<Vec<PathBuf>, FlexiLoggerError> {
if let Some(fw) = self.o_file_writer.as_ref() {
fw.existing_log_files()
} else {
Ok(Vec::new())
}
}
}
impl LogWriter for MultiWriter {
fn validate_logs(&self, expected: &[(&'static str, &'static str, &'static str)]) {
if let Some(ref writer) = self.o_file_writer {
(*writer).validate_logs(expected);
}
if let Some(ref writer) = self.o_other_writer {
(*writer).validate_logs(expected);
}
}
fn write(&self, now: &mut DeferredNow, record: &Record) -> std::io::Result<()> {
if match self.duplicate_stderr {
Duplicate::Error => record.level() == log::Level::Error,
Duplicate::Warn => record.level() <= log::Level::Warn,
Duplicate::Info => record.level() <= log::Level::Info,
Duplicate::Debug => record.level() <= log::Level::Debug,
Duplicate::Trace | Duplicate::All => true,
Duplicate::None => false,
} {
if self.support_capture {
let mut tmp_buf = Vec::<u8>::with_capacity(200);
(self.format_for_stderr)(&mut tmp_buf, now, record)
.unwrap_or_else(|e| eprint_err(ErrorCode::Format, "formatting failed", &e));
eprintln!("{}", String::from_utf8_lossy(&tmp_buf));
} else {
write_buffered(
self.format_for_stderr,
now,
record,
&mut std::io::stderr(),
#[cfg(test)]
None,
)?;
}
}
if match self.duplicate_stdout {
Duplicate::Error => record.level() == log::Level::Error,
Duplicate::Warn => record.level() <= log::Level::Warn,
Duplicate::Info => record.level() <= log::Level::Info,
Duplicate::Debug => record.level() <= log::Level::Debug,
Duplicate::Trace | Duplicate::All => true,
Duplicate::None => false,
} {
if self.support_capture {
let mut tmp_buf = Vec::<u8>::with_capacity(200);
(self.format_for_stdout)(&mut tmp_buf, now, record)
.unwrap_or_else(|e| eprint_err(ErrorCode::Format, "formatting failed", &e));
println!("{}", String::from_utf8_lossy(&tmp_buf));
} else {
write_buffered(
self.format_for_stdout,
now,
record,
&mut std::io::stdout(),
#[cfg(test)]
None,
)?;
}
}
if let Some(ref writer) = self.o_file_writer {
writer.write(now, record)?;
}
if let Some(ref writer) = self.o_other_writer {
writer.write(now, record)?;
}
Ok(())
}
/// Provides the maximum log level that is to be written.
fn max_log_level(&self) -> log::LevelFilter {
*self
.o_file_writer
.as_ref()
.map(|w| w.max_log_level())
.iter()
.chain(
self.o_other_writer
.as_ref()
.map(|w| w.max_log_level())
.iter(),
)
.max()
.unwrap(/*ok*/)
}
fn flush(&self) -> std::io::Result<()> {
if let Some(ref writer) = self.o_file_writer {
writer.flush()?;
}
if let Some(ref writer) = self.o_other_writer {
writer.flush()?;
}
if !matches!(self.duplicate_stderr, Duplicate::None) {
std::io::stderr().flush()?;
}
if !matches!(self.duplicate_stdout, Duplicate::None) {
std::io::stdout().flush()?;
}
Ok(())
}
fn shutdown(&self) {
if let Some(ref writer) = self.o_file_writer {
writer.shutdown();
}
if let Some(ref writer) = self.o_other_writer {
writer.shutdown();
}
}
}