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https://github.com/neondatabase/neon.git
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84008a2560
This contains a lowest common denominator of pageserver and safekeeper log initialisation routines. It uses daemonize flag to decide where to stream log messages. In case daemonize is true log messages are forwarded to file. Otherwise streaming to stdout is used. Usage of stdout for log output is the default in docker side of things, so make it easier to browse our logs via builtin docker commands.
48 lines
1.7 KiB
Rust
48 lines
1.7 KiB
Rust
use slog::{Drain, Level};
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use std::{
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fs::{File, OpenOptions},
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path::Path,
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};
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use anyhow::{Context, Result};
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pub fn init(
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log_filename: impl AsRef<Path>,
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daemonize: bool,
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) -> Result<(slog_scope::GlobalLoggerGuard, File)> {
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// Don't open the same file for output multiple times;
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// the different fds could overwrite each other's output.
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let log_file = OpenOptions::new()
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.create(true)
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.append(true)
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.open(&log_filename)
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.with_context(|| format!("failed to open {:?}", log_filename.as_ref()))?;
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// we are cloning and returning log file in order to allow redirecting daemonized stdout and stderr to it
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// if we do not use daemonization (e.g. in docker) it is better to log to stdout directly
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// for example to be in line with docker log command which expects logs comimg from stdout
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let guard = if daemonize {
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let decorator = slog_term::PlainSyncDecorator::new(log_file.try_clone()?);
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let drain = slog_term::FullFormat::new(decorator)
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.build()
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.filter_level(Level::Info)
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.fuse();
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let logger = slog::Logger::root(drain, slog::o!());
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slog_scope::set_global_logger(logger)
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} else {
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let decorator = slog_term::TermDecorator::new().build();
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let drain = slog_term::FullFormat::new(decorator)
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.build()
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.filter_level(Level::Info)
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.fuse();
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let drain = slog_async::Async::new(drain).chan_size(1000).build().fuse();
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let logger = slog::Logger::root(drain, slog::o!());
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slog_scope::set_global_logger(logger)
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};
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// initialise forwarding of std log calls
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slog_stdlog::init()?;
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Ok((guard, log_file))
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}
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