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use crate::events::{LOG_CALL_TRACE_TOPIC, LOG_INPUT_TOPIC};
use crate::payload::pack;
use crate::{EResult, Error};
use busrt::client::AsyncClient;
use busrt::QoS;
use lazy_static::lazy_static;
use log::{Level, LevelFilter, Log};
use once_cell::sync::OnceCell;
use serde::Serialize;
use std::collections::HashMap;
use std::sync::Arc;
use uuid::Uuid;
tokio::task_local! {
pub static CALL_TRACE_ID: Option<Uuid>;
}
#[derive(Serialize)]
pub struct TraceMessage {
l: u8,
msg: String,
}
lazy_static! {
static ref LOG_TOPICS: HashMap<Level, String> = {
let mut topics = HashMap::new();
topics.insert(Level::Trace, format!("{}{}", LOG_INPUT_TOPIC, "trace"));
topics.insert(Level::Debug, format!("{}{}", LOG_INPUT_TOPIC, "debug"));
topics.insert(Level::Info, format!("{}{}", LOG_INPUT_TOPIC, "info"));
topics.insert(Level::Warn, format!("{}{}", LOG_INPUT_TOPIC, "warn"));
topics.insert(Level::Error, format!("{}{}", LOG_INPUT_TOPIC, "error"));
topics
};
static ref LOG_TX: OnceCell<async_channel::Sender<(log::Level, String)>> = <_>::default();
static ref TRACE_TX: OnceCell<async_channel::Sender<(TraceMessage, Uuid)>> = <_>::default();
}
static BUS_LOGGER: BusLogger = BusLogger {
log_filter: OnceCell::new(),
};
struct BusLogger {
log_filter: OnceCell<LevelFilter>,
}
impl Log for BusLogger {
#[inline]
fn enabled(&self, metadata: &log::Metadata) -> bool {
!metadata.target().starts_with("busrt::") && !metadata.target().starts_with("mio::")
}
#[inline]
fn log(&self, record: &log::Record) {
if self.enabled(record.metadata()) {
if let Some(tx) = LOG_TX.get() {
let level = record.level();
if level <= *self.log_filter.get().unwrap() {
let _r = tx.try_send((level, format!("{}", record.args())));
}
}
let trid: Option<Uuid> = CALL_TRACE_ID.try_with(Clone::clone).unwrap_or_default();
if let Some(trace_id) = trid {
if let Some(tx) = TRACE_TX.get() {
let _r = tx.try_send((
TraceMessage {
l: crate::log_level_code(record.level()),
msg: format!("{}", record.args()),
},
trace_id,
));
}
}
}
}
#[inline]
fn flush(&self) {}
}
async fn handle_logs<C>(
client: Arc<tokio::sync::Mutex<C>>,
rx: async_channel::Receiver<(Level, String)>,
) where
C: ?Sized + AsyncClient,
{
while let Ok((level, message)) = rx.recv().await {
if let Err(e) = client
.lock()
.await
.publish(
LOG_TOPICS.get(&level).unwrap(),
message.as_bytes().into(),
QoS::No,
)
.await
{
eprintln!("{}", e);
}
}
}
async fn handle_traces<C>(
client: Arc<tokio::sync::Mutex<C>>,
rx: async_channel::Receiver<(TraceMessage, Uuid)>,
) where
C: ?Sized + AsyncClient,
{
while let Ok((trace_message, trace_id)) = rx.recv().await {
let trace_topic = format!("{}{}", LOG_CALL_TRACE_TOPIC, trace_id);
match pack(&trace_message) {
Ok(payload) => {
if let Err(e) = client
.lock()
.await
.publish(&trace_topic, payload.into(), QoS::No)
.await
{
eprintln!("{}", e);
}
}
Err(e) => eprintln!("{}", e),
}
}
}
pub fn init_bus<C>(
client: Arc<tokio::sync::Mutex<C>>,
queue_size: usize,
filter: LevelFilter,
call_tracing: bool,
) -> EResult<()>
where
C: ?Sized + AsyncClient + 'static,
{
let (tx, rx) = async_channel::bounded(queue_size);
LOG_TX
.set(tx)
.map_err(|_| Error::failed("Unable to set LOG_TX"))?;
let cl = client.clone();
tokio::spawn(async move {
handle_logs(cl, rx).await;
});
if call_tracing {
let (tx, rx) = async_channel::bounded(queue_size);
TRACE_TX
.set(tx)
.map_err(|_| Error::failed("Unable to set TRACE_TX"))?;
tokio::spawn(async move {
handle_traces(client, rx).await;
});
}
BUS_LOGGER
.log_filter
.set(filter)
.map_err(|_| Error::failed("Unable to set BUS_LOGGER filter"))?;
log::set_logger(&BUS_LOGGER)
.map(|()| {
log::set_max_level(if call_tracing {
LevelFilter::Trace
} else {
filter
});
})
.map_err(Error::failed)?;
Ok(())
}