rustic 0.1.9

Library for building canisters on the Internet Computer.
Documentation 
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// =============================================
// Stable Logging Module for Canisters
// =============================================
#![cfg(feature = "stable-logging")]

//! # Stable Logging Module for Canisters
//! Logs are stored in stable memory, which is persisted across canister upgrades.

use crate::memory_map::*;
#[cfg(test)]
use crate::testing::*;
use crate::types::*;
use crate::utils::*;

use candid::CandidType;
use ic_stable_structures::{storable::Blob, Log, Storable};
use serde::{Deserialize, Serialize};
use std::borrow::Cow;
use std::cell::{Cell, RefCell};
use std::collections::VecDeque;
use std::io::Write;
use tracing::Level;

// thread_local! {
//     pub static STABLE_LOG: RefCell<Log<StableLogEntry, VM, VM>> =
//         MEMORY_MANAGER.with(|mm| {
//             RefCell::new(Log::new(mm.borrow().get(STABLE_LOG_IDX_ID), mm.borrow().get(STABLE_LOG_MEM_ID)))
//     });
// }

// #[derive(CandidType, Serialize, Deserialize, Clone)]
// pub struct StableLogEntry {
//     pub timestamp: u64,
//     pub level: Level,
//     pub message: String,
// }

// impl Storable for StableLogEntry {
//     fn to_bytes(&self) -> Cow<[u8]> {
//         let mut bytes = Vec::new();
//         bytes.extend_from_slice(&self.timestamp.to_le_bytes());
//         bytes.push(self.message.len() as u8);
//         bytes.extend_from_slice(self.message.as_bytes());
//         bytes.into()
//     }

//     /// Panics if the bytes are invalid.
//     fn from_bytes(bytes: Cow<[u8]>) -> Self {
//         assert!(bytes.len() >= 8 + 1);
//         #[allow(clippy::unwrap_used)] // unwrap allowed
//         let timestamp = u64::from_le_bytes(bytes[0..8].try_into().unwrap());
//         let message_length = bytes[8] as usize;
//         let message_bytes = &bytes[9..9 + message_length];
//         let message = String::from_utf8_lossy(message_bytes).to_string();
//         Self { timestamp, message }
//     }

//     const BOUND: ic_stable_structures::storable::Bound =
//         ic_stable_structures::storable::Bound::Unbounded;
// }

// impl std::fmt::Display for StableLogEntry {
//     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
//         write!(f, "{} {:?}", self.timestamp, self.message)
//     }
// }

// /// Add a line of given log level to the debug log, only when
// /// the given level is smaller than or equal to config.debug_log_level.
// pub fn stable_log(level: Level, line: String) -> Result<(), ReturnError> {
//     let config = get_mpc_config();
//     if (level as u8) <= config.debug_log_level {
//         STABLE_LOG.with(|log| {
//             log.borrow()
//                 .append(&format!(
//                     "{} {:?} {}",
//                     canister_time() / 1_000_000,
//                     level,
//                     line
//                 ))
//                 .map(|_| ())
//                 .map_err(|_| ReturnError::OutOfMemory)
//         })
//     } else {
//         Ok(())
//     }
// }