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extern crate lazy_static;
use std::cell::RefCell;
use std::time;
use std::fmt;
use std::mem;
use std::io::{stderr, StderrLock, Write};
use std::iter::repeat;
use std::collections::{HashSet};
use std::default::Default;
use std::iter::FromIterator;
use std::sync::RwLock;
use lazy_static::lazy_static;
type Message = (usize, u64, String);
pub struct Profiler {
desc: String,
}
pub struct Filter {
depth: usize,
allowed: Vec<String>,
}
struct ProfileStack {
starts: Vec<time::Instant>,
messages: Vec<Message>,
filter_data: FilterData,
}
impl ProfileStack {
fn new() -> ProfileStack {
ProfileStack { starts: Vec::new(), messages: Vec::new(), filter_data: Default::default() }
}
}
#[derive(Default)]
struct FilterData {
depth: usize,
version: usize,
allowed: HashSet<String>,
}
impl Clone for FilterData {
fn clone(&self) -> FilterData {
let set = HashSet::from_iter(self.allowed.iter().cloned());
FilterData { depth: self.depth, allowed: set, version: self.version }
}
}
lazy_static! {
static ref FILTER: RwLock<FilterData> = RwLock::new(Default::default());
}
thread_local!(static PROFILE_STACK: RefCell<ProfileStack> = RefCell::new(ProfileStack::new()));
pub fn set_filter(f: Filter) {
let mut old = FILTER.write().unwrap();
let set = HashSet::from_iter(f.allowed.iter().cloned());
let filter_data = FilterData { depth: f.depth, allowed: set, version: old.version + 1 };
*old = filter_data;
}
pub fn profile<T: fmt::Display>(desc: T) -> Profiler {
PROFILE_STACK.with(|stack| {
let mut stack = stack.borrow_mut();
if stack.starts.len() == 0 {
match FILTER.try_read() {
Ok(f) => {
if f.version > stack.filter_data.version {
stack.filter_data = f.clone();
}
}
Err(_) => (),
};
}
let desc_str = desc.to_string();
if desc_str.is_empty() {
Profiler { desc: desc_str }
} else if stack.starts.len() < stack.filter_data.depth
&& stack.filter_data.allowed.contains(&desc_str)
{
stack.starts.push(time::Instant::now());
Profiler { desc: desc_str }
} else {
Profiler { desc: String::new() }
}
})
}
impl Drop for Profiler {
fn drop(&mut self) {
if self.desc.is_empty() {
return;
}
PROFILE_STACK.with(|stack| {
let mut stack = stack.borrow_mut();
let start = stack.starts.pop().unwrap();
let duration = start.elapsed();
let duration_ms = duration.as_secs() * 1000 + u64::from(duration.subsec_millis());
let stack_len = stack.starts.len();
let msg = (stack_len, duration_ms, mem::replace(&mut self.desc, String::new()));
stack.messages.push(msg);
if stack_len == 0 {
let stdout = stderr();
print(0, &stack.messages, 1, &mut stdout.lock());
stack.messages.clear();
}
});
}
}
fn print(lvl: usize, msgs: &[Message], enabled: usize, stdout: &mut StderrLock<'_>) {
if lvl > enabled {
return;
}
let mut last = 0;
for (i, &(l, time, ref msg)) in msgs.iter().enumerate() {
if l != lvl {
continue;
}
writeln!(
stdout,
"{} {:6}ms - {}",
repeat(" ").take(lvl + 1).collect::<String>(),
time,
msg
)
.expect("printing profiling info to stdout");
print(lvl + 1, &msgs[last..i], enabled, stdout);
last = i;
}
}
#[cfg(test)]
mod tests {
use super::profile;
use super::set_filter;
use super::Filter;
#[test]
fn test_basic_profile() {
let s = vec!["profile1".to_string(), "profile2".to_string()];
let f = Filter { depth: 2, allowed: s };
set_filter(f);
profiling_function1();
}
fn profiling_function1() {
let _p = profile("profile1");
profiling_function2();
}
fn profiling_function2() {
let _p = profile("profile2");
}
}
|
