PlantCtrl/Software/MainBoard/rust/src/log/interceptor.rs

use alloc::string::String;
use alloc::vec::Vec;
use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
use embassy_sync::blocking_mutex::Mutex as BlockingMutex;
use embassy_sync::mutex::Mutex;
use log::{LevelFilter, Log, Metadata, Record};

pub struct InterceptorLogger {
    // Async mutex for start/stop capture from async context
    async_capture: Mutex<CriticalSectionRawMutex, ()>,
    // Blocking mutex for the actual data to be used in sync log()
    sync_capture: BlockingMutex<CriticalSectionRawMutex, core::cell::RefCell<Option<Vec<String>>>>,
}

impl InterceptorLogger {
    pub const fn new() -> Self {
        Self {
            async_capture: Mutex::new(()),
            sync_capture: BlockingMutex::new(core::cell::RefCell::new(None)),
        }
    }

    pub async fn start_capture(&self) {
        let _guard = self.async_capture.lock().await;
        self.sync_capture.lock(|capture| {
            *capture.borrow_mut() = Some(Vec::new());
        });
    }

    pub async fn stop_capture(&self) -> Option<Vec<String>> {
        let _guard = self.async_capture.lock().await;
        self.sync_capture
            .lock(|capture| capture.borrow_mut().take())
    }

    pub fn init(&'static self) {
        log::set_logger(self)
            .map(|()| log::set_max_level(LevelFilter::Info))
            .unwrap();
    }
}

impl Log for InterceptorLogger {
    fn enabled(&self, metadata: &Metadata) -> bool {
        metadata.level() <= log::Level::Info
    }

    fn log(&self, record: &Record) {
        if self.enabled(record.metadata()) {
            let message = alloc::format!("{}", record.args());

            // Print to serial using esp_println
            esp_println::println!("{}: {}", record.level(), message);

            // Capture if active
            self.sync_capture.lock(|capture| {
                if let Some(ref mut buffer) = *capture.borrow_mut() {
                    buffer.push(alloc::format!("{}: {}", record.level(), message));
                }
            });
        }
    }

    fn flush(&self) {}
}