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--git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..92523b9 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,17 @@ +[package] +name = "gifboy-loadtester" +version = "0.1.0" +edition = "2021" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +prometheus_exporter = "0.8" +crossterm = "0.23" +tui = "0.18.0" +tokio = { version = "1", features = ["full"] } +anyhow = "1.0" +reqwest = { version = "0.11", features = ["stream"] } +futures-util = {version = "0.3"} +num_cpus = "1.13.1" +bytesize = "1.1.0" \ No newline at end of file diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..987a75b --- /dev/null +++ b/src/main.rs @@ -0,0 +1,195 @@ +use std::{io, sync::{Arc, atomic::{AtomicU32, Ordering, AtomicBool, AtomicUsize}}, time::Duration}; +use futures_util::{StreamExt, future}; +use tui::{backend::CrosstermBackend, Terminal}; +use tokio::{sync::{mpsc, Mutex}, task::JoinHandle}; +use tokio::join; + +mod ui; +use tui::{ + backend::Backend, + layout::{Constraint, Direction, Layout}, + widgets::{Block, Borders}, + Frame, +}; + +#[derive(Clone)] +pub struct State { + // should contain only arcs or things that we don't expect to change. the ui clones it + num_requests: Arc, + num_tasks: Arc, + num_connections_open: Arc, + num_tasks_errored: Arc, + num_bytes_downloaded: Arc, + shutting_down: Arc, + url: String, + log_send: mpsc::Sender, +} + +fn main() { + tokio::runtime::Builder::new_current_thread() + .worker_threads(num_cpus::get_physical() - 1) // leave a core free + .enable_all() + .build() + .unwrap() + .block_on(async_main()) +} + +async fn async_main() { + // Some simple CLI args requirements... + let url = match std::env::args().nth(1) { + Some(url) => url, + None => { + println!("No CLI URL provided, exiting."); + return; + } + }; + + let (log_send, log_recv) = mpsc::channel::(32); + + let state = State { + num_requests: Default::default(), + num_tasks: Default::default(), + num_connections_open: Default::default(), + num_tasks_errored: Default::default(), + num_bytes_downloaded: Default::default(), + shutting_down: Default::default(), + url, + log_send + }; + + let tui_handle = tokio::task::spawn(ui::tui(state.clone(), log_recv)); + + let download_task_manager = tokio::task::spawn(download_task_manager(state.clone())); + + download_task_manager.await.unwrap(); + // if something happened here then we are shutting down. + state.shutting_down.store(true, Ordering::Relaxed); + tui_handle.await.unwrap(); +} + +async fn download_task_manager(state: State) -> anyhow::Result<()> { + let download_tasks = Arc::new(tokio::sync::RwLock::new(vec![])); + + // Two tasks - one adds new download tasks if there aren't enough, one clears out finished ones. + + let create_download_tasks = download_tasks.clone(); + let create_state = state.clone(); + let create = tokio::spawn(async { + let download_tasks = create_download_tasks; + let state = create_state; + + while !state.shutting_down.load(Ordering::Relaxed) { + let num_download_tasks = { + download_tasks.read().await.len() + }; + if num_download_tasks < state.num_requests.load(Ordering::Relaxed) { + // take the write lock then iterate until we have enough + let mut download_tasks = download_tasks.write().await; + + while download_tasks.len() < state.num_requests.load(Ordering::Relaxed) { + let new_id = download_tasks.len(); + download_tasks.push(tokio::task::spawn(download_task(state.clone(), new_id))); + state.num_tasks.store(download_tasks.len(), Ordering::Release); + } + } + tokio::time::sleep(Duration::from_secs(1)).await; + } + }); + + let destroy_download_tasks = download_tasks.clone(); + let destroy_state = state.clone(); + let destroy = tokio::spawn(async { + let download_tasks = destroy_download_tasks; + let state = destroy_state; + let log_send = state.log_send.clone(); + + while !state.shutting_down.load(Ordering::Relaxed) { + { + // take a write lock to await them all + let mut download_tasks = download_tasks.write().await; + + // create a timeout task for how long we want to spend clearing out threads, total. + let mut timeout_task_vec = vec![tokio::spawn(async { + tokio::time::sleep(Duration::from_millis(500)).await; + Ok::(TaskKind::TimeoutTask) + })]; + + loop { + let download_tasks_and_timeout: Vec<&mut JoinHandle>> = download_tasks.iter_mut().chain(timeout_task_vec.iter_mut()).collect(); + match future::select_all(download_tasks_and_timeout).await { + (Ok(Ok(TaskKind::DownloadTask)), index, remaining) => { + // no problem just clean up the task + download_tasks.remove(index); + }, + (Ok(Err(e_inner)), index, remaining) => { + // clean up the task and log its error + download_tasks.remove(index); + log_send.send(format!("Unhandled error in a download task (index {}): {}", index, e_inner)).await.unwrap(); + state.num_tasks_errored.fetch_add(1, Ordering::SeqCst); + }, + (Err(e), index, remaining) => { + log_send.send(format!("Error waiting for any download tasks to finish: {} (index {}?)", e, index)).await.unwrap(); + + }, + (Ok(Ok(TaskKind::TimeoutTask)), _, _) => { + // time's up, give up the write lock. + break; + } + } + state.num_tasks.store(download_tasks.len(), Ordering::Release); + } + } + // Do this outside of the section we hold the write lock + tokio::time::sleep(Duration::from_secs(1)).await; + } + }); + + let (create_res, destroy_res) = join!(create, destroy); + create_res?; + destroy_res?; + //future::select_all(iter) + //state.num_tasks.store(download_tasks.len(), Ordering::Relaxed); + Ok::<(), anyhow::Error>(()) +} + + +async fn download_task(state: State, load_id: usize) -> anyhow::Result { + let log_send = state.log_send.clone(); + match reqwest::get(&state.url).await { + Ok(response) => { + state.num_connections_open.fetch_add(1, Ordering::SeqCst); + let mut stream = response.bytes_stream(); + while load_id < state.num_requests.load(Ordering::Relaxed) && !state.shutting_down.load(Ordering::Relaxed) { + match stream.next().await { + Some(Ok(bytes)) => { + state.num_bytes_downloaded.fetch_add(bytes.len().try_into()?, Ordering::Relaxed); + }, + Some(Err(e)) => { + log_send.send(format!("Task id {} errored while reading: {}", load_id, e)).await?; + // do this second just in case the await fails. if the await fails or we otherwise exit, we'll add this *outside* + state.num_tasks_errored.fetch_add(1, Ordering::SeqCst); + break; + }, + None => { + state.num_tasks_errored.fetch_add(1, Ordering::SeqCst); + log_send.send(format!("Task id {} ran out of data.", load_id)).await?; + break; + } + } + } + state.num_connections_open.fetch_sub(1, Ordering::SeqCst); + log_send.send(format!("Task id {} exiting normally.", load_id)).await?; + }, + Err(e) => { + state.num_tasks_errored.fetch_add(1, Ordering::SeqCst); + log_send.send(format!("Task id {} couldn't connect: {}", load_id, e)).await?; + tokio::time::sleep(Duration::from_secs(1)).await; + }, + } + Ok::(TaskKind::DownloadTask) +} + +enum TaskKind { + DownloadTask, + TimeoutTask +} \ No newline at end of file diff --git a/src/ui.rs b/src/ui.rs new file mode 100644 index 0000000..021aa67 --- /dev/null +++ b/src/ui.rs @@ -0,0 +1,130 @@ +use bytesize::ByteSize; +use crossterm::{ + event::{self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode, poll}, + execute, + terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen}, +}; +use tokio::sync::mpsc; +use std::{error::Error, io::{self, Write}, sync::atomic::Ordering, time::Duration, collections::VecDeque}; +use tui::{ + backend::{Backend, CrosstermBackend}, + layout::{Constraint, Direction, Layout, Corner}, + style::{Color, Modifier, Style}, + text::{Span, Spans, Text}, + widgets::{Block, Borders, List, ListItem, Paragraph}, + Frame, Terminal, terminal, +}; +//use unicode_width::UnicodeWidthStr; + +use crate::State; + +struct UiState { + state: State, + log_messages: VecDeque, +} + +pub async fn tui(state: State, log_recv: mpsc::Receiver) -> anyhow::Result<()> { + + enable_raw_mode()?; + let mut stdout = io::stdout(); + execute!(stdout, EnterAlternateScreen)?; + let backend = CrosstermBackend::new(stdout); + let mut terminal = Terminal::new(backend)?; + + let ui_state = UiState { + state: state, + log_messages: Default::default() + }; + let res = tokio::task::spawn_blocking(move || run_app_outer(terminal, ui_state, log_recv)).await?; + + if let Err(err) = res { + println!("{:?}", err) + } + + Ok::<(), anyhow::Error>(()) +} + +fn run_app_outer(mut terminal: Terminal, mut ui_state: UiState, mut log_recv: mpsc::Receiver) -> anyhow::Result<()> { + let result = run_app(&mut terminal, ui_state, log_recv); + + // restore terminal + disable_raw_mode().unwrap(); + execute!( + terminal.backend_mut(), + LeaveAlternateScreen, + DisableMouseCapture + ).unwrap(); + terminal.show_cursor().unwrap(); + result +} + +fn run_app(terminal: &mut Terminal, mut ui_state: UiState, mut log_recv: mpsc::Receiver) -> anyhow::Result<()> { + while !ui_state.state.shutting_down.load(Ordering::Relaxed) { + while let Ok(msg) = log_recv.try_recv() { + ui_state.log_messages.push_front(msg); + } + + terminal.draw(|f| ui(f, &ui_state))?; + + if poll(Duration::from_millis(50))? { + if let Event::Key(key) = event::read()? { + match key.code { + KeyCode::Char('q') => { + ui_state.state.shutting_down.store(true, Ordering::Relaxed); + }, + KeyCode::Up => { + ui_state.state.num_requests.fetch_add(1, Ordering::Relaxed); + }, + KeyCode::Down => { + let current = ui_state.state.num_requests.load(Ordering::Relaxed); + if current > 0 { + ui_state.state.num_requests.store(current - 1, Ordering::Relaxed); + } + }, + KeyCode::PageUp => { + ui_state.state.num_requests.fetch_add(10, Ordering::Relaxed); + }, + KeyCode::PageDown => { + let current = ui_state.state.num_requests.load(Ordering::Relaxed); + if current > 10 { + ui_state.state.num_requests.store(current - 10, Ordering::Relaxed); + } + }, + _ => () + } + } + } + } + Ok(()) + +} + +fn ui(f: &mut Frame, ui_state: &UiState) { + let layout = Layout::default() + .direction(Direction::Vertical) + .margin(2) + .constraints( + [ + Constraint::Length(2), + Constraint::Min(10), + ] + .as_ref(), + ) + .split(f.size()); + + let mut text = Text::from(Spans::from( + format!("target # requests: {} | {} tasks have {} open conns | errors: {} | received: {} (q: quit, up/down: add/remove requests, pageup/down: more)", + ui_state.state.num_requests.load(Ordering::Relaxed), + ui_state.state.num_tasks.load(Ordering::Relaxed), + ui_state.state.num_connections_open.load(Ordering::Relaxed), + ui_state.state.num_tasks_errored.load(Ordering::Relaxed), + ByteSize::b(ui_state.state.num_bytes_downloaded.load(Ordering::Relaxed).into()), + ))); + f.render_widget(Paragraph::new(text), layout[0]); + + let log_list_items: Vec = ui_state.log_messages.iter().map(|msg| ListItem::new(Spans::from(msg.as_ref()))).collect(); + let log_list = List::new(log_list_items) + .block(Block::default().borders(Borders::ALL).title("Log")) + .start_corner(Corner::BottomLeft); + f.render_widget(log_list, layout[1]); +} \ No newline at end of file