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main.rs
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main.rs
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//! helper to extract span stats from a chrome trace file
//! spec: <https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview#heading=h.puwqg050lyuy>
use std::ops::Div;
use clap::Parser;
use parse::read_trace;
use regex::Regex;
use termcolor::{ColorChoice, StandardStream};
use crate::pretty::{print_spanstats, set_bold, simplify_name};
mod parse;
mod pretty;
#[derive(Parser, Debug)]
struct Args {
#[clap(short, long, value_parser, default_value_t = 0.0)]
/// Filter spans that have an average shorther than the threshold
threshold: f32,
#[clap(short, long, value_parser)]
/// Filter spans by name matching the pattern
pattern: Option<Regex>,
#[clap(short, long, value_parser)]
/// Simplify system names
short: bool,
#[clap(value_parser)]
trace: String,
/// Optional, second trace to compare
#[clap(value_parser)]
second_trace: Option<String>,
}
fn main() {
let cli = Args::parse();
// Setup stdout to support colors
let mut stdout = StandardStream::stdout(ColorChoice::Auto);
// Read the first trace file
let reference = read_trace(cli.trace);
if let Some(comparison) = cli.second_trace {
// Read the second trace file
let mut comparison = read_trace(comparison);
reference
.iter()
.filter(|(_, stats)| filter_by_threshold(stats, cli.threshold))
.filter(|(name, _)| filter_by_pattern(name, cli.pattern.as_ref()))
.for_each(|(span, reference)| {
// for each span in the first trace
set_bold(&mut stdout, true);
if cli.short {
println!("{}", simplify_name(span));
} else {
println!("{}", span);
}
set_bold(&mut stdout, false);
print!(" ");
let comparison = comparison.remove(span);
print_spanstats(&mut stdout, Some(reference), comparison.as_ref(), false);
});
comparison
.iter()
.filter(|(_, stats)| filter_by_threshold(stats, cli.threshold))
.filter(|(name, _)| filter_by_pattern(name, cli.pattern.as_ref()))
.for_each(|(span, comparison)| {
// print the spans only present in the second trace
set_bold(&mut stdout, true);
if cli.short {
println!("{}", simplify_name(span));
} else {
println!("{}", span);
}
set_bold(&mut stdout, false);
print!(" ");
print_spanstats(&mut stdout, None, Some(comparison), false);
});
} else {
// just print stats from the first trace
reference
.iter()
.filter(|(_, stats)| filter_by_threshold(stats, cli.threshold))
.filter(|(name, _)| filter_by_pattern(name, cli.pattern.as_ref()))
.for_each(|(span, reference)| {
set_bold(&mut stdout, true);
if cli.short {
println!("{}", simplify_name(span));
} else {
println!("{}", span);
}
set_bold(&mut stdout, false);
print!(" ");
print_spanstats(&mut stdout, Some(reference), None, true);
});
}
}
fn filter_by_threshold(span_stats: &SpanStats, threshold: f32) -> bool {
span_stats.avg > threshold
}
fn filter_by_pattern(name: &str, pattern: Option<&Regex>) -> bool {
if let Some(pattern) = pattern {
pattern.is_match(name)
} else {
true
}
}
#[derive(Debug)]
pub struct SpanStats {
pub count: usize,
pub avg: f32,
pub min: f32,
pub max: f32,
}
impl Default for SpanStats {
fn default() -> Self {
Self {
count: 0,
avg: 0.0,
min: f32::MAX,
max: 0.0,
}
}
}
impl SpanStats {
fn add_span(&mut self, duration: f32) {
if duration < self.min {
self.min = duration;
}
if duration > self.max {
self.max = duration;
}
self.avg = (self.avg * self.count as f32 + duration) / (self.count as f32 + 1.0);
self.count += 1;
}
}
pub struct SpanRelative {
count: f32,
avg: f32,
min: f32,
max: f32,
}
impl Div for &SpanStats {
type Output = SpanRelative;
fn div(self, rhs: Self) -> Self::Output {
Self::Output {
count: self.count as f32 / rhs.count as f32,
avg: self.avg / rhs.avg,
min: self.min / rhs.min,
max: self.max / rhs.max,
}
}
}