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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.use crate::serde::Serialize;use crate::OpId;use std::cell::RefCell;use std::cell::RefMut;
// TODO(@AaronO): split into AggregateMetrics & PerOpMetrics#[derive(Clone, Default, Debug, Serialize)]#[serde(rename_all = "camelCase")]pub struct OpMetrics {  pub ops_dispatched: u64,  pub ops_dispatched_sync: u64,  pub ops_dispatched_async: u64,  // TODO(bartlomieju): this field is never updated  pub ops_dispatched_async_unref: u64,  pub ops_completed: u64,  pub ops_completed_sync: u64,  pub ops_completed_async: u64,  // TODO(bartlomieju): this field is never updated  pub ops_completed_async_unref: u64,  pub bytes_sent_control: u64,  pub bytes_sent_data: u64,  pub bytes_received: u64,}
// TODO(@AaronO): track errors#[derive(Default, Debug)]pub struct OpsTracker {  pub ops: RefCell<Vec<OpMetrics>>,}
impl OpsTracker {  pub fn per_op(&self) -> Vec<OpMetrics> {    self.ops.borrow().clone()  }
  pub fn aggregate(&self) -> OpMetrics {    let mut sum = OpMetrics::default();
    for metrics in self.ops.borrow().iter() {      sum.ops_dispatched += metrics.ops_dispatched;      sum.ops_dispatched_sync += metrics.ops_dispatched_sync;      sum.ops_dispatched_async += metrics.ops_dispatched_async;      sum.ops_dispatched_async_unref += metrics.ops_dispatched_async_unref;      sum.ops_completed += metrics.ops_completed;      sum.ops_completed_sync += metrics.ops_completed_sync;      sum.ops_completed_async += metrics.ops_completed_async;      sum.ops_completed_async_unref += metrics.ops_completed_async_unref;      sum.bytes_sent_control += metrics.bytes_sent_control;      sum.bytes_sent_data += metrics.bytes_sent_data;      sum.bytes_received += metrics.bytes_received;    }
    sum  }
  fn ensure_capacity(&self, op_id: OpId) {    let ops = &mut self.ops.borrow_mut();    if op_id >= ops.len() {      let delta_len = 1 + op_id - ops.len();      ops.extend(vec![OpMetrics::default(); delta_len])    }  }
  fn metrics_mut(&self, id: OpId) -> RefMut<OpMetrics> {    self.ensure_capacity(id);    RefMut::map(self.ops.borrow_mut(), |ops| ops.get_mut(id).unwrap())  }
  pub fn track_sync(&self, id: OpId) {    let metrics = &mut self.metrics_mut(id);    metrics.ops_dispatched += 1;    metrics.ops_completed += 1;    metrics.ops_dispatched_sync += 1;    metrics.ops_completed_sync += 1;  }
  pub fn track_async(&self, id: OpId) {    let metrics = &mut self.metrics_mut(id);    metrics.ops_dispatched += 1;    metrics.ops_dispatched_async += 1;  }
  pub fn track_async_completed(&self, id: OpId) {    let metrics = &mut self.metrics_mut(id);    metrics.ops_completed += 1;    metrics.ops_completed_async += 1;  }}