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hbs.rs
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hbs.rs
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use heartbeats_simple_sys::*;
use std::mem;
use std::io::{self, Write};
use std::fs::File;
pub use heartbeats_simple_sys::heartbeat_context as HeartbeatContext;
pub use heartbeats_simple_sys::heartbeat_record as HeartbeatRecord;
pub use heartbeats_simple_sys::heartbeat_window_complete as HeartbeatWindowComplete;
/// Contains the Heartbeat and its window data buffer.
pub struct Heartbeat {
pub hb: HeartbeatContext,
pub hbr: Vec<HeartbeatRecord>,
pub log: Option<File>,
}
impl Heartbeat {
/// Allocate and initialize a new `Heartbeat`.
pub fn new(window_size: usize,
hwc_callback: HeartbeatWindowComplete,
mut log: Option<File>) -> Result<Heartbeat, &'static str> {
let mut hbr: Vec<HeartbeatRecord> = Vec::with_capacity(window_size);
let hb: HeartbeatContext = unsafe {
// must explicitly set size so we can read data later
// (Rust isn't aware of native code modifying the buffer)
hbr.set_len(window_size);
let mut hb = mem::uninitialized();
match heartbeat_init(&mut hb,
hbr.capacity() as u64,
hbr.as_mut_ptr(),
-1,
hwc_callback) {
0 => hb,
_ => return Err("Failed to initialize heartbeat")
}
};
// write header to log file if there is one
if let Some(ref mut l) = log {
l.write_all(format!("{:6} {:6} \
{:11} {:11} {:11} \
{:15} {:15} {:20} {:20} \
{:15} {:15} {}\n",
"HB", "Tag",
"Global_Work", "Window_Work", "Work",
"Global_Time", "Window_Time", "Start_Time", "End_Time",
"Global_Perf", "Window_Perf", "Instant_Perf").as_bytes()).unwrap()
}
Ok(Heartbeat { hb: hb, hbr: hbr, log: log, })
}
/// Issue a heartbeat
pub fn heartbeat(&mut self,
tag: u64,
work: u64,
start_time: u64,
end_time: u64) {
unsafe {
heartbeat(&mut self.hb, tag, work, start_time, end_time)
}
}
fn write_log(r: &HeartbeatRecord, l: &mut File) -> io::Result<usize> {
l.write(format!("{:<6} {:<6} \
{:<11} {:<11} {:<11} \
{:<15} {:<15} {:<20} {:<20} \
{:<15.6} {:<15.6} {:<.6}\n",
r.id, r.user_tag,
r.wd.global, r.wd.window, r.work,
r.td.global, r.td.window, r.start_time, r.end_time,
r.perf.global, r.perf.window, r.perf.instant).as_bytes())
}
/// Rust-only function that logs the buffer (up to buffer_index) to a file.
pub fn log_to_buffer_index(&mut self) -> io::Result<()> {
match self.log {
Some(ref mut l) => {
for i in 0..self.hb.ws.buffer_index {
match Heartbeat::write_log(self.hbr.get(i as usize).unwrap(), l) {
Ok(_) => (),
Err(e) => return Err(e),
}
}
l.flush()
}
None => Ok(())
}
}
pub fn get_window_size(&self) -> u64 {
unsafe {
hb_get_window_size(&self.hb)
}
}
pub fn get_user_tag(&self) -> u64 {
unsafe {
hb_get_user_tag(&self.hb)
}
}
pub fn get_global_time(&self) -> u64 {
unsafe {
hb_get_global_time(&self.hb)
}
}
pub fn get_window_time(&self) -> u64 {
unsafe {
hb_get_window_time(&self.hb)
}
}
pub fn get_global_work(&self) -> u64 {
unsafe {
hb_get_global_work(&self.hb)
}
}
pub fn get_window_work(&self) -> u64 {
unsafe {
hb_get_window_work(&self.hb)
}
}
pub fn get_global_perf(&self) -> f64 {
unsafe {
hb_get_global_perf(&self.hb)
}
}
pub fn get_window_perf(&self) -> f64 {
unsafe {
hb_get_window_perf(&self.hb)
}
}
pub fn get_instant_perf(&self) -> f64 {
unsafe {
hb_get_instant_perf(&self.hb)
}
}
}
#[cfg(test)]
mod test {
use super::*;
use std::fs::File;
#[test]
fn test_simple() {
const TIME_INC: u64 = 1000000000;
let mut hb = Heartbeat::new(5, None, None).unwrap();
let mut start_time: u64 = 0;
let mut end_time: u64 = TIME_INC;
for tag in 0..10 {
hb.heartbeat(tag, 1, start_time, end_time);
start_time = end_time;
end_time += TIME_INC;
}
}
#[test]
fn test_callback() {
static mut RECEIVED_CB: bool = false;
extern fn callback(_hb: *const HeartbeatContext) {
unsafe {
RECEIVED_CB = true;
}
}
let mut hb = Heartbeat::new(1, Some(callback), None).unwrap();
hb.heartbeat(0, 1, 0, 1000);
unsafe {
assert!(RECEIVED_CB);
}
}
#[test]
fn test_file() {
let mut hb = Heartbeat::new(5, None, Some(File::create("foo.log").unwrap())).unwrap();
hb.heartbeat(0, 1, 0, 1000);
hb.log_to_buffer_index().unwrap();
}
}