145 lines
3.8 KiB
Rust
145 lines
3.8 KiB
Rust
// SPDX-License-Identifier: GPL-3.0-only
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#[cfg(feature = "debug")]
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use std::{
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collections::VecDeque,
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sync::{
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atomic::{AtomicBool, Ordering},
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Arc, Mutex,
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},
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};
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use anyhow::Result;
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use slog::Drain;
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#[cfg(feature = "debug")]
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mod serializer;
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#[cfg(feature = "debug")]
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const MAX_RECORDS: usize = 1000;
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#[cfg(feature = "debug")]
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pub type LogBuffer = Arc<Mutex<VecDeque<OwnedRecord>>>;
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#[cfg(feature = "debug")]
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#[derive(Clone)]
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struct DebugDrain {
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buffer: LogBuffer,
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dirty_flag: Arc<AtomicBool>,
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}
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pub struct LogState {
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_guard: slog_scope::GlobalLoggerGuard,
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#[cfg(feature = "debug")]
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pub dirty_flag: Arc<AtomicBool>,
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#[cfg(feature = "debug")]
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pub debug_buffer: LogBuffer,
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}
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#[cfg(feature = "debug")]
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pub struct OwnedRecord {
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pub message: String,
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pub level: slog::Level,
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pub kv: serde_json::map::Map<String, serde_json::Value>,
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}
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#[cfg(feature = "debug")]
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impl DebugDrain {
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fn new() -> (DebugDrain, LogBuffer, Arc<AtomicBool>) {
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let dirty_flag = Arc::new(AtomicBool::new(false));
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let buffer = Arc::new(Mutex::new(VecDeque::new()));
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(
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DebugDrain {
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buffer: buffer.clone(),
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dirty_flag: dirty_flag.clone(),
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},
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buffer,
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dirty_flag,
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)
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}
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}
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#[cfg(feature = "debug")]
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impl Drain for DebugDrain {
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type Ok = ();
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type Err = slog::Error;
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fn log(
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&self,
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record: &slog::Record<'_>,
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values: &slog::OwnedKVList,
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) -> Result<Self::Ok, Self::Err> {
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use serde_json::value::{Serializer as ValueSerializer, Value};
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use serializer::SerdeSerializer;
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use slog::KV;
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let mut serializer = SerdeSerializer::start(ValueSerializer, None)?;
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values.serialize(record, &mut serializer)?;
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record.kv().serialize(record, &mut serializer)?;
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let value = match serializer.end().map_err(|_| slog::Error::Other)? {
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Value::Object(map) => map,
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_ => unreachable!(),
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};
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let mut buffer = self.buffer.lock().unwrap();
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buffer.push_front(OwnedRecord {
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message: format!("{}", record.msg()),
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level: record.level(),
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kv: value,
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});
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buffer.truncate(MAX_RECORDS);
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self.dirty_flag.store(true, Ordering::SeqCst);
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Ok(())
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}
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}
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pub fn init_logger() -> Result<LogState> {
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let decorator = slog_term::TermDecorator::new().stderr().build();
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// usually we would not want to use a Mutex here, but this is usefull for a prototype,
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// to make sure we do not miss any in-flight messages, when we crash.
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#[cfg(not(feature = "debug"))]
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let logger = slog::Logger::root(
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std::sync::Mutex::new(
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slog_term::CompactFormat::new(decorator)
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.build()
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.ignore_res(),
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)
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.fuse(),
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slog::o!(),
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);
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#[cfg(feature = "debug")]
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let (debug_drain, debug_buffer, dirty_flag) = DebugDrain::new();
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#[cfg(feature = "debug")]
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let logger = slog::Logger::root(
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slog::Duplicate::new(
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std::sync::Mutex::new(
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slog_term::CompactFormat::new(decorator)
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.build()
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.ignore_res(),
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),
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debug_drain,
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)
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.fuse(),
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slog::o!(),
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);
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let _guard = slog_scope::set_global_logger(logger);
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slog_stdlog::init().unwrap();
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slog_scope::info!("Version: {}", std::env!("CARGO_PKG_VERSION"));
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if cfg!(feature = "debug") {
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slog_scope::debug!(
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"Debug build ({})",
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std::option_env!("GIT_HASH").unwrap_or("Unknown")
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);
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}
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Ok(LogState {
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_guard,
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#[cfg(feature = "debug")]
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debug_buffer,
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#[cfg(feature = "debug")]
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dirty_flag,
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})
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}
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