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mod heaptrack;
mod nextjs;
mod turbopack;
use std::{
any::Any,
env,
fs::File,
io::{self, BufReader, Read, Seek, SeekFrom},
path::PathBuf,
sync::Arc,
thread::{self, JoinHandle},
time::{Duration, Instant},
};
use anyhow::Result;
use flate2::bufread::GzDecoder;
use crate::{
reader::{heaptrack::HeaptrackFormat, nextjs::NextJsFormat, turbopack::TurbopackFormat},
store_container::StoreContainer,
};
const MIN_INITIAL_REPORT_SIZE: u64 = 100 * 1024 * 1024;
trait TraceFormat {
type Reused: Default;
fn read(&mut self, buffer: &[u8], reuse: &mut Self::Reused) -> Result<usize>;
fn stats(&self) -> String {
String::new()
}
}
type ErasedReused = Box<dyn Any>;
struct ErasedTraceFormat(Box<dyn ObjectSafeTraceFormat>);
trait ObjectSafeTraceFormat {
fn create_reused(&self) -> ErasedReused;
fn read(&mut self, buffer: &[u8], reuse: &mut ErasedReused) -> Result<usize>;
fn stats(&self) -> String;
}
impl<T: TraceFormat> ObjectSafeTraceFormat for T
where
T::Reused: 'static,
{
fn create_reused(&self) -> ErasedReused {
Box::new(T::Reused::default())
}
fn read(&mut self, buffer: &[u8], reuse: &mut ErasedReused) -> Result<usize> {
let reuse = reuse.downcast_mut().expect("Type of reuse is invalid");
TraceFormat::read(self, buffer, reuse)
}
fn stats(&self) -> String {
TraceFormat::stats(self)
}
}
impl ObjectSafeTraceFormat for ErasedTraceFormat {
fn create_reused(&self) -> ErasedReused {
self.0.create_reused()
}
fn read(&mut self, buffer: &[u8], reuse: &mut ErasedReused) -> Result<usize> {
self.0.read(buffer, reuse)
}
fn stats(&self) -> String {
self.0.stats()
}
}
#[derive(Default)]
enum TraceFile {
Raw(File),
Zstd(zstd::Decoder<'static, BufReader<File>>),
Gz(GzDecoder<BufReader<File>>),
#[default]
Unloaded,
}
impl TraceFile {
fn read(&mut self, buffer: &mut [u8]) -> io::Result<usize> {
match self {
Self::Raw(file) => file.read(buffer),
Self::Zstd(decoder) => decoder.read(buffer),
Self::Gz(decoder) => decoder.read(buffer),
Self::Unloaded => unreachable!(),
}
}
fn stream_position(&mut self) -> io::Result<u64> {
match self {
Self::Raw(file) => file.stream_position(),
Self::Zstd(decoder) => decoder.get_mut().stream_position(),
Self::Gz(decoder) => decoder.get_mut().stream_position(),
Self::Unloaded => unreachable!(),
}
}
fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
match self {
Self::Raw(file) => file.seek(pos),
Self::Zstd(decoder) => decoder.get_mut().seek(pos),
Self::Gz(decoder) => decoder.get_mut().seek(pos),
Self::Unloaded => unreachable!(),
}
}
fn size(&mut self) -> io::Result<u64> {
match self {
Self::Raw(file) => file.metadata().map(|m| m.len()),
Self::Zstd(decoder) => decoder.get_mut().get_ref().metadata().map(|m| m.len()),
Self::Gz(decoder) => decoder.get_mut().get_ref().metadata().map(|m| m.len()),
Self::Unloaded => unreachable!(),
}
}
}
pub struct TraceReader {
store: Arc<StoreContainer>,
path: PathBuf,
}
impl TraceReader {
pub fn spawn(store: Arc<StoreContainer>, path: PathBuf) -> JoinHandle<()> {
let mut reader = Self { store, path };
std::thread::spawn(move || reader.run())
}
pub fn run(&mut self) {
let mut file_warning_printed = false;
loop {
let read_success = self.try_read();
if !file_warning_printed && !read_success {
println!("Unable to read trace file at {:?}, waiting...", self.path);
file_warning_printed = true;
}
thread::sleep(Duration::from_millis(500));
}
}
fn trace_file_from_file(&self, file: File) -> io::Result<TraceFile> {
let path = &self.path.to_string_lossy();
Ok(if path.ends_with(".zst") {
TraceFile::Zstd(zstd::Decoder::new(file)?)
} else if path.ends_with(".gz") {
TraceFile::Gz(GzDecoder::new(BufReader::new(file)))
} else {
TraceFile::Raw(file)
})
}
fn try_read(&mut self) -> bool {
let Ok(mut file) = File::open(&self.path) else {
return false;
};
println!("Trace file opened");
let stop_at = env::var("STOP_AT")
.unwrap_or_default()
.parse()
.map_or(u64::MAX, |v: u64| v * 1024 * 1024);
if stop_at != u64::MAX {
println!("Will stop reading file at {} MB", stop_at / 1024 / 1024)
}
{
let mut store = self.store.write();
store.reset();
}
let mut format: Option<(ErasedTraceFormat, ErasedReused)> = None;
let mut current_read = 0;
let mut initial_read = file
.seek(SeekFrom::End(0))
.ok()
.map(|total| (total, Instant::now()));
if file.seek(SeekFrom::Start(0)).is_err() {
return false;
}
let mut file = match self.trace_file_from_file(file) {
Ok(f) => f,
Err(err) => {
println!("Error creating zstd decoder: {err}");
return false;
}
};
let mut buffer = Vec::new();
let mut index = 0;
let mut chunk = vec![0; 64 * 1024 * 1024];
loop {
match file.read(&mut chunk) {
Ok(bytes_read) => {
if bytes_read == 0 {
if let Some(value) = self.wait_for_more_data(
&mut file,
&mut initial_read,
format.as_ref().map(|(f, _)| f),
) {
return value;
}
} else {
// If we have partially consumed some data, and we are at buffer capacity,
// remove the consumed data to make more space.
if index > 0 && buffer.len() + bytes_read > buffer.capacity() {
buffer.splice(..index, std::iter::empty());
index = 0;
}
buffer.extend_from_slice(&chunk[..bytes_read]);
if format.is_none() && buffer.len() >= 8 {
let erased_format = if buffer.starts_with(b"TRACEv0") {
index = 7;
ErasedTraceFormat(Box::new(TurbopackFormat::new(
self.store.clone(),
)))
} else if buffer.starts_with(b"[{\"name\"") {
ErasedTraceFormat(Box::new(NextJsFormat::new(self.store.clone())))
} else if buffer.starts_with(b"v ") {
ErasedTraceFormat(Box::new(HeaptrackFormat::new(
self.store.clone(),
)))
} else {
// Fallback to the format without magic bytes
// TODO Remove this after a while and show an error instead
ErasedTraceFormat(Box::new(TurbopackFormat::new(
self.store.clone(),
)))
};
let reuse = erased_format.create_reused();
format = Some((erased_format, reuse));
}
if let Some((format, reuse)) = &mut format {
match format.read(&buffer[index..], reuse) {
Ok(bytes_read) => {
index += bytes_read;
}
Err(err) => {
println!("Trace file error: {err}");
return true;
}
}
if self.store.want_to_read() {
thread::yield_now();
}
let prev_read = current_read;
current_read += bytes_read as u64;
if let Some((total, start)) = &mut initial_read {
let old_mbs = prev_read / (97 * 1024 * 1024);
let new_mbs = current_read / (97 * 1024 * 1024);
if old_mbs != new_mbs {
let pos = file.stream_position().unwrap_or(current_read);
if pos > *total {
*total = file.size().unwrap_or(pos);
}
*total = (*total).max(pos);
let percentage = pos * 100 / *total;
let read = pos / (1024 * 1024);
let uncompressed = current_read / (1024 * 1024);
let total = *total / (1024 * 1024);
let stats = format.stats();
print!(
"{}% read ({}/{} MB, {} MB/s)",
percentage,
read,
total,
read * 1000 / (start.elapsed().as_millis() + 1) as u64
);
if uncompressed != read {
print!(" ({uncompressed} MB uncompressed)");
}
if stats.is_empty() {
println!();
} else {
println!(" - {stats}");
}
}
}
if current_read >= stop_at {
println!(
"Stopped reading file as requested by STOP_AT env var. \
Waiting for new file..."
);
self.wait_for_new_file(&mut file);
return true;
}
}
}
}
Err(err) => {
if err.kind() == io::ErrorKind::UnexpectedEof {
if let Some(value) = self.wait_for_more_data(
&mut file,
&mut initial_read,
format.as_ref().map(|(f, _)| f),
) {
return value;
}
} else {
// Error reading file, maybe it was removed
println!("Error reading trace file: {err:?}");
return true;
}
}
}
}
}
fn wait_for_more_data(
&mut self,
file: &mut TraceFile,
initial_read: &mut Option<(u64, Instant)>,
format: Option<&ErasedTraceFormat>,
) -> Option<bool> {
let Ok(pos) = file.stream_position() else {
return Some(true);
};
if let Some((total, start)) = initial_read.take() {
if let Some(format) = format {
let stats = format.stats();
println!("{stats}");
}
if total > MIN_INITIAL_REPORT_SIZE {
println!(
"Initial read completed ({} MB, {}s)",
total / (1024 * 1024),
(start.elapsed().as_millis() / 100) as f32 / 10.0
);
}
}
loop {
// No more data to read, sleep for a while to wait for more data
thread::sleep(Duration::from_millis(100));
let Ok(mut real_file) = File::open(&self.path) else {
return Some(true);
};
let Ok(end) = real_file.seek(SeekFrom::End(0)) else {
return Some(true);
};
if end < pos {
// new file
return Some(true);
} else if end != pos {
// file has more data
return None;
}
}
}
fn wait_for_new_file(&self, file: &mut TraceFile) {
let Ok(pos) = file.stream_position() else {
return;
};
loop {
thread::sleep(Duration::from_millis(1000));
let Ok(end) = file.seek(SeekFrom::End(0)) else {
return;
};
if end < pos {
return;
}
}
}
}
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