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metrics.rs
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metrics.rs
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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
#[derive(Default, Debug)]
pub struct Metrics {
pub ops_dispatched: u64,
pub ops_dispatched_sync: u64,
pub ops_dispatched_async: u64,
pub ops_dispatched_async_unref: u64,
pub ops_completed: u64,
pub ops_completed_sync: u64,
pub ops_completed_async: u64,
pub ops_completed_async_unref: u64,
pub bytes_sent_control: u64,
pub bytes_sent_data: u64,
pub bytes_received: u64,
}
impl Metrics {
fn op_dispatched(
&mut self,
bytes_sent_control: usize,
bytes_sent_data: usize,
) {
self.ops_dispatched += 1;
self.bytes_sent_control += bytes_sent_control as u64;
self.bytes_sent_data += bytes_sent_data as u64;
}
fn op_completed(&mut self, bytes_received: usize) {
self.ops_completed += 1;
self.bytes_received += bytes_received as u64;
}
pub fn op_sync(
&mut self,
bytes_sent_control: usize,
bytes_sent_data: usize,
bytes_received: usize,
) {
self.ops_dispatched_sync += 1;
self.op_dispatched(bytes_sent_control, bytes_sent_data);
self.ops_completed_sync += 1;
self.op_completed(bytes_received);
}
pub fn op_dispatched_async(
&mut self,
bytes_sent_control: usize,
bytes_sent_data: usize,
) {
self.ops_dispatched_async += 1;
self.op_dispatched(bytes_sent_control, bytes_sent_data)
}
pub fn op_dispatched_async_unref(
&mut self,
bytes_sent_control: usize,
bytes_sent_data: usize,
) {
self.ops_dispatched_async_unref += 1;
self.op_dispatched(bytes_sent_control, bytes_sent_data)
}
pub fn op_completed_async(&mut self, bytes_received: usize) {
self.ops_completed_async += 1;
self.op_completed(bytes_received);
}
pub fn op_completed_async_unref(&mut self, bytes_received: usize) {
self.ops_completed_async_unref += 1;
self.op_completed(bytes_received);
}
}
use deno_core::BufVec;
use deno_core::Op;
use deno_core::OpFn;
use deno_core::OpState;
use std::cell::RefCell;
use std::rc::Rc;
pub fn metrics_op(op_fn: Box<OpFn>) -> Box<OpFn> {
Box::new(move |op_state: Rc<RefCell<OpState>>, bufs: BufVec| -> Op {
// TODOs:
// * The 'bytes' metrics seem pretty useless, especially now that the
// distinction between 'control' and 'data' buffers has become blurry.
// * Tracking completion of async ops currently makes us put the boxed
// future into _another_ box. Keeping some counters may not be expensive
// in itself, but adding a heap allocation for every metric seems bad.
let mut buf_len_iter = bufs.iter().map(|buf| buf.len());
let bytes_sent_control = buf_len_iter.next().unwrap_or(0);
let bytes_sent_data = buf_len_iter.sum();
let op = (op_fn)(op_state.clone(), bufs);
let op_state_ = op_state.clone();
let mut s = op_state.borrow_mut();
let metrics = s.borrow_mut::<Metrics>();
use deno_core::futures::future::FutureExt;
match op {
Op::Sync(buf) => {
metrics.op_sync(bytes_sent_control, bytes_sent_data, buf.len());
Op::Sync(buf)
}
Op::Async(fut) => {
metrics.op_dispatched_async(bytes_sent_control, bytes_sent_data);
let fut = fut
.inspect(move |buf| {
let mut s = op_state_.borrow_mut();
let metrics = s.borrow_mut::<Metrics>();
metrics.op_completed_async(buf.len());
})
.boxed_local();
Op::Async(fut)
}
Op::AsyncUnref(fut) => {
metrics.op_dispatched_async_unref(bytes_sent_control, bytes_sent_data);
let fut = fut
.inspect(move |buf| {
let mut s = op_state_.borrow_mut();
let metrics = s.borrow_mut::<Metrics>();
metrics.op_completed_async_unref(buf.len());
})
.boxed_local();
Op::AsyncUnref(fut)
}
other => other,
}
})
}