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Optimize reading and writing the state file

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This commit is contained in:
mo8it 2024-08-29 01:56:45 +02:00
parent 789492d1a9
commit fc1f9f0124
1 changed files with 76 additions and 62 deletions
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138
src/app_state.rs
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@ -1,8 +1,8 @@
use anyhow::{bail, Context, Result};
use std::{
env,
fs::{self, File},
io::{self, Read, StdoutLock, Write},
fs::{File, OpenOptions},
io::{self, Read, Seek, StdoutLock, Write},
path::Path,
process::{Command, Stdio},
thread,
@ -18,7 +18,6 @@ use crate::{
};
const STATE_FILE_NAME: &str = ".rustlings-state.txt";
const BAD_INDEX_ERR: &str = "The current exercise index is higher than the number of exercises";
#[must_use]
pub enum ExercisesProgress {
@ -47,6 +46,7 @@ pub struct AppState {
// Caches the number of done exercises to avoid iterating over all exercises every time.
n_done: u16,
final_message: String,
state_file: File,
// Preallocated buffer for reading and writing the state file.
file_buf: Vec<u8>,
official_exercises: bool,
@ -56,59 +56,22 @@ pub struct AppState {
}
impl AppState {
// Update the app state from the state file.
fn update_from_file(&mut self) -> StateFileStatus {
self.file_buf.clear();
self.n_done = 0;
if File::open(STATE_FILE_NAME)
.and_then(|mut file| file.read_to_end(&mut self.file_buf))
.is_err()
{
return StateFileStatus::NotRead;
}
// See `Self::write` for more information about the file format.
let mut lines = self.file_buf.split(|c| *c == b'\n').skip(2);
let Some(current_exercise_name) = lines.next() else {
return StateFileStatus::NotRead;
};
if current_exercise_name.is_empty() || lines.next().is_none() {
return StateFileStatus::NotRead;
}
let mut done_exercises = hash_set_with_capacity(self.exercises.len());
for done_exerise_name in lines {
if done_exerise_name.is_empty() {
break;
}
done_exercises.insert(done_exerise_name);
}
for (ind, exercise) in self.exercises.iter_mut().enumerate() {
if done_exercises.contains(exercise.name.as_bytes()) {
exercise.done = true;
self.n_done += 1;
}
if exercise.name.as_bytes() == current_exercise_name {
self.current_exercise_ind = ind;
}
}
StateFileStatus::Read
}
pub fn new(
exercise_infos: Vec<ExerciseInfo>,
final_message: String,
) -> Result<(Self, StateFileStatus)> {
let cmd_runner = CmdRunner::build()?;
let mut state_file = OpenOptions::new()
.create(true)
.read(true)
.write(true)
.truncate(false)
.open(STATE_FILE_NAME)
.with_context(|| {
format!("Failed to open or create the state file {STATE_FILE_NAME}")
})?;
let exercises = exercise_infos
let mut exercises = exercise_infos
.into_iter()
.map(|exercise_info| {
// Leaking to be able to borrow in the watch mode `Table`.
@ -126,25 +89,69 @@ impl AppState {
test: exercise_info.test,
strict_clippy: exercise_info.strict_clippy,
hint,
// Updated in `Self::update_from_file`.
// Updated below.
done: false,
}
})
.collect::<Vec<_>>();
let mut slf = Self {
current_exercise_ind: 0,
let mut current_exercise_ind = 0;
let mut n_done = 0;
let mut file_buf = Vec::with_capacity(2048);
let state_file_status = 'block: {
if state_file.read_to_end(&mut file_buf).is_err() {
break 'block StateFileStatus::NotRead;
}
// See `Self::write` for more information about the file format.
let mut lines = file_buf.split(|c| *c == b'\n').skip(2);
let Some(current_exercise_name) = lines.next() else {
break 'block StateFileStatus::NotRead;
};
if current_exercise_name.is_empty() || lines.next().is_none() {
break 'block StateFileStatus::NotRead;
}
let mut done_exercises = hash_set_with_capacity(exercises.len());
for done_exerise_name in lines {
if done_exerise_name.is_empty() {
break;
}
done_exercises.insert(done_exerise_name);
}
for (ind, exercise) in exercises.iter_mut().enumerate() {
if done_exercises.contains(exercise.name.as_bytes()) {
exercise.done = true;
n_done += 1;
}
if exercise.name.as_bytes() == current_exercise_name {
current_exercise_ind = ind;
}
}
StateFileStatus::Read
};
file_buf.clear();
file_buf.extend_from_slice(STATE_FILE_HEADER);
let slf = Self {
current_exercise_ind,
exercises,
n_done: 0,
n_done,
final_message,
file_buf: Vec::with_capacity(2048),
state_file,
file_buf,
official_exercises: !Path::new("info.toml").exists(),
cmd_runner,
vs_code: env::var_os("TERM_PROGRAM").is_some_and(|v| v == "vscode"),
};
let state_file_status = slf.update_from_file();
Ok((slf, state_file_status))
}
@ -187,10 +194,8 @@ impl AppState {
// - The fourth line is an empty line.
// - All remaining lines are the names of done exercises.
fn write(&mut self) -> Result<()> {
self.file_buf.clear();
self.file_buf.truncate(STATE_FILE_HEADER.len());
self.file_buf
.extend_from_slice(b"DON'T EDIT THIS FILE!\n\n");
self.file_buf
.extend_from_slice(self.current_exercise().name.as_bytes());
self.file_buf.push(b'\n');
@ -202,7 +207,14 @@ impl AppState {
}
}
fs::write(STATE_FILE_NAME, &self.file_buf)
self.state_file
.rewind()
.with_context(|| format!("Failed to rewind the state file {STATE_FILE_NAME}"))?;
self.state_file
.set_len(0)
.with_context(|| format!("Failed to truncate the state file {STATE_FILE_NAME}"))?;
self.state_file
.write_all(&self.file_buf)
.with_context(|| format!("Failed to write the state file {STATE_FILE_NAME}"))?;
Ok(())
@ -440,11 +452,12 @@ impl AppState {
}
}
const BAD_INDEX_ERR: &str = "The current exercise index is higher than the number of exercises";
const STATE_FILE_HEADER: &[u8] = b"DON'T EDIT THIS FILE!\n\n";
const RERUNNING_ALL_EXERCISES_MSG: &[u8] = b"
All exercises seem to be done.
Recompiling and running all exercises to make sure that all of them are actually done.
";
const FENISH_LINE: &str = "+----------------------------------------------------+
| You made it to the Fe-nish line! |
+-------------------------- ------------------------+
@ -490,6 +503,7 @@ mod tests {
exercises: vec![dummy_exercise(), dummy_exercise(), dummy_exercise()],
n_done: 0,
final_message: String::new(),
state_file: tempfile::tempfile().unwrap(),
file_buf: Vec::new(),
official_exercises: true,
cmd_runner: CmdRunner::build().unwrap(),