Struct fern::Output
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pub struct Output(_);
Configuration for a logger output.
Methods
impl Output
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pub fn file<T: Into<Cow<'static, str>>>(file: File, line_sep: T) -> Self
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Returns a file logger using a custom separator.
If the default separator of \n
is acceptable, an fs::File
instance can be passed into
Dispatch::chain
directly.
fern::Dispatch::new() .chain(std::fs::File::create("log")?)
fern::Dispatch::new() .chain(fern::log_file("log")?)
Example usage (using fern::log_file
):
fern::Dispatch::new() .chain(fern::Output::file(fern::log_file("log")?, "\r\n"))
pub fn writer<T: Into<Cow<'static, str>>>(
writer: Box<Write + Send>,
line_sep: T
) -> Self
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writer: Box<Write + Send>,
line_sep: T
) -> Self
Returns a logger using arbitrary write object and custom separator.
If the default separator of \n
is acceptable, an Box<Write + Send>
instance can be
passed into Dispatch::chain
directly.
fern::Dispatch::new() // Explicit cast to the right trait object so the `From` implementation is chosen. .chain(Box::new(std::io::Cursor::new(Vec::<u8>::new())) as Box<std::io::Write + Send>)
let writer: Box<std::io::Write + Send> = Box::new(std::io::Cursor::new(Vec::<u8>::new())); fern::Dispatch::new() .chain(fern::Output::writer(Box::new(std::io::Cursor::new(Vec::<u8>::new())), "\r\n"))
pub fn stdout<T: Into<Cow<'static, str>>>(line_sep: T) -> Self
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Returns an stdout logger using a custom separator.
If the default separator of \n
is acceptable, an io::Stdout
instance can be passed into
Dispatch::chain()
directly.
fern::Dispatch::new() .chain(std::io::stdout())
pub fn stderr<T: Into<Cow<'static, str>>>(line_sep: T) -> Self
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Returns an stderr logger using a custom separator.
If the default separator of \n
is acceptable, an io::Stderr
instance can be passed into
Dispatch::chain()
directly.
fern::Dispatch::new() .chain(std::io::stderr())
pub fn sender<T: Into<Cow<'static, str>>>(
sender: Sender<String>,
line_sep: T
) -> Self
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sender: Sender<String>,
line_sep: T
) -> Self
Returns a mpsc::Sender logger using a custom separator.
If the default separator of \n
is acceptable, an mpsc::Sender<String>
instance can be passed into
Dispatch::chain()
directly.
Each log message will be suffixed with the separator, then sent as a single String to the given sender.
use std::sync::mpsc::channel; let (tx, rx) = channel(); fern::Dispatch::new() .chain(tx)
Trait Implementations
impl From<Dispatch> for Output
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fn from(log: Dispatch) -> Self
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Creates an output logger forwarding all messages to the dispatch.
impl From<Box<Log>> for Output
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fn from(log: Box<Log>) -> Self
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Creates an output logger forwarding all messages to the custom logger.
impl From<&'static Log> for Output
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fn from(log: &'static Log) -> Self
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Creates an output logger forwarding all messages to the custom logger.
impl From<File> for Output
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fn from(file: File) -> Self
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Creates an output logger which writes all messages to the file with \n
as the separator.
File writes are buffered and flushed once per log record.
impl From<Box<Write + Send>> for Output
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fn from(writer: Box<Write + Send>) -> Self
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Creates an output logger which writes all messages to the writer with \n
as the separator.
This does no buffering and it is up to the writer to do buffering as needed (eg. wrap it in
BufWriter
). However, flush is called after each log record.
impl From<Stdout> for Output
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fn from(stream: Stdout) -> Self
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Creates an output logger which writes all messages to stdout with the given handle and \n
as the separator.
impl From<Stderr> for Output
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fn from(stream: Stderr) -> Self
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Creates an output logger which writes all messages to stderr with the given handle and \n
as the separator.
impl From<Sender<String>> for Output
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fn from(stream: Sender<String>) -> Self
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Creates an output logger which writes all messages to the given mpsc::Sender with '\n' as the separator.
All messages sent to the mpsc channel are suffixed with '\n'.
impl From<Logger> for Output
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fn from(log: Logger) -> Self
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Creates an output logger which writes all messages to the given syslog output.
Log levels are translated trace => debug, debug => debug, info => informational, warn => warning, and error => error.
impl From<Box<Logger>> for Output
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fn from(log: Box<Logger>) -> Self
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Creates an output logger which writes all messages to the given syslog output.
Log levels are translated trace => debug, debug => debug, info => informational, warn => warning, and error => error.
Note that while this takes a Boxsyslog::Logger
.
impl From<Panic> for Output
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fn from(_: Panic) -> Self
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Creates an output logger which will panic with message text for all messages.