fluentbase_runtime/syscall_handler/host/
debug_log.rs

1use crate::RuntimeContext;
2use core::cell::Cell;
3use rwasm::{StoreTr, TrapCode, Value};
4
5thread_local! {
6    pub static LAST_LOG_TIME: Cell<u128> = const { Cell::new(0) };
7}
8
9pub fn syscall_debug_log_handler(
10    caller: &mut impl StoreTr<RuntimeContext>,
11    params: &[Value],
12    _result: &mut [Value],
13) -> Result<(), TrapCode> {
14    let (message_ptr, message_len) = (
15        params[0].i32().unwrap() as usize,
16        params[1].i32().unwrap() as usize,
17    );
18    let mut buffer = vec![0u8; message_len];
19    caller.memory_read(message_ptr, &mut buffer)?;
20    syscall_debug_log_impl(&buffer);
21    Ok(())
22}
23
24#[cfg(feature = "debug-print")]
25pub fn syscall_debug_log_impl(mut msg: &[u8]) {
26    use std::time::SystemTime;
27    let curr_time = SystemTime::now()
28        .duration_since(SystemTime::UNIX_EPOCH)
29        .unwrap()
30        .as_micros();
31    let last_time = LAST_LOG_TIME.get();
32    let time_diff = if last_time > 0 {
33        curr_time - last_time
34    } else {
35        0
36    };
37    LAST_LOG_TIME.set(curr_time);
38    const DEBUG_LOG_MAXIMUM_LEN: usize = 1_000;
39    if msg.len() > DEBUG_LOG_MAXIMUM_LEN {
40        msg = &msg[..DEBUG_LOG_MAXIMUM_LEN]
41    }
42    println!(
43        "debug_log (diff {}us): {}",
44        time_diff,
45        std::str::from_utf8(msg)
46            .map(|s| s.to_string())
47            .unwrap_or("non utf-8 message".to_string())
48    );
49}
50
51#[cfg(not(feature = "debug-print"))]
52pub fn syscall_debug_log_impl(_msg: &[u8]) {}
fluentbase_runtime/syscall_handler/host/debug_log.rs

fluentbase_runtime/syscall_handler/host/
debug_log.rs
