ruff/crates/red_knot/tests/file_watching.rs
Micha Reiser eb47a6634d
Add support for configuring knot in pyproject.toml files (#15493)
## Summary

This PR adds support for configuring Red Knot in the `tool.knot` section
of the project's
`pyproject.toml` section. Options specified on the CLI precede the
options in the configuration file.

This PR only supports the `environment` and the `src.root` options for
now.
Other options will be added as separate PRs.

There are also a few concerns that I intentionally ignored as part of
this PR:

* Handling of relative paths: We need to anchor paths relative to the
current working directory (CLI), or the project (`pyproject.toml` or
`knot.toml`)
* Tracking the source of a value. Diagnostics would benefit from knowing
from which configuration a value comes so that we can point the user to
the right configuration file (or CLI) if the configuration is invalid.
* Schema generation and there's a lot more; see
https://github.com/astral-sh/ruff/issues/15491

This PR changes the default for first party codes: Our existing default
was to only add the project root. Now, Red Knot adds the project root
and `src` (if such a directory exists).

Theoretically, we'd have to add a file watcher event that changes the
first-party search paths if a user later creates a `src` directory. I
think this is pretty uncommon, which is why I ignored the complexity for
now but I can be persuaded to handle it if it's considered important.

Part of https://github.com/astral-sh/ruff/issues/15491

## Test Plan

Existing tests, new file watching test demonstrating that changing the
python version and platform is correctly reflected.
2025-01-17 09:41:06 +01:00

1487 lines
47 KiB
Rust

#![allow(clippy::disallowed_names)]
use std::io::Write;
use std::time::{Duration, Instant};
use anyhow::{anyhow, Context};
use red_knot_python_semantic::{
resolve_module, ModuleName, PythonPlatform, PythonVersion, SitePackages,
};
use red_knot_workspace::db::{Db, ProjectDatabase};
use red_knot_workspace::project::options::{EnvironmentOptions, Options};
use red_knot_workspace::project::pyproject::{PyProject, Tool};
use red_knot_workspace::project::ProjectMetadata;
use red_knot_workspace::watch::{directory_watcher, ChangeEvent, ProjectWatcher};
use ruff_db::files::{system_path_to_file, File, FileError};
use ruff_db::source::source_text;
use ruff_db::system::{OsSystem, SystemPath, SystemPathBuf};
use ruff_db::Upcast;
struct TestCase {
db: ProjectDatabase,
watcher: Option<ProjectWatcher>,
changes_receiver: crossbeam::channel::Receiver<Vec<ChangeEvent>>,
/// The temporary directory that contains the test files.
/// We need to hold on to it in the test case or the temp files get deleted.
_temp_dir: tempfile::TempDir,
root_dir: SystemPathBuf,
}
impl TestCase {
fn project_path(&self, relative: impl AsRef<SystemPath>) -> SystemPathBuf {
SystemPath::absolute(relative, self.db.project().root(&self.db))
}
fn root_path(&self) -> &SystemPath {
&self.root_dir
}
fn db(&self) -> &ProjectDatabase {
&self.db
}
#[track_caller]
fn stop_watch<M>(&mut self, matcher: M) -> Vec<ChangeEvent>
where
M: MatchEvent,
{
// track_caller is unstable for lambdas -> That's why this is a fn
#[track_caller]
fn panic_with_formatted_events(events: Vec<ChangeEvent>) -> Vec<ChangeEvent> {
panic!(
"Didn't observe expected change:\n{}",
events
.into_iter()
.map(|event| format!(" - {event:?}"))
.collect::<Vec<_>>()
.join("\n")
)
}
self.try_stop_watch(matcher, Duration::from_secs(10))
.unwrap_or_else(panic_with_formatted_events)
}
fn try_stop_watch<M>(
&mut self,
mut matcher: M,
timeout: Duration,
) -> Result<Vec<ChangeEvent>, Vec<ChangeEvent>>
where
M: MatchEvent,
{
tracing::debug!("Try stopping watch with timeout {:?}", timeout);
let watcher = self
.watcher
.take()
.expect("Cannot call `stop_watch` more than once");
let start = Instant::now();
let mut all_events = Vec::new();
loop {
let events = self
.changes_receiver
.recv_timeout(Duration::from_millis(100))
.unwrap_or_default();
if events
.iter()
.any(|event| matcher.match_event(event) || event.is_rescan())
{
all_events.extend(events);
break;
}
all_events.extend(events);
if start.elapsed() > timeout {
return Err(all_events);
}
}
watcher.flush();
tracing::debug!("Flushed file watcher");
watcher.stop();
tracing::debug!("Stopping file watcher");
// Consume remaining events
for event in &self.changes_receiver {
all_events.extend(event);
}
Ok(all_events)
}
fn take_watch_changes<M: MatchEvent>(&self, matcher: M) -> Vec<ChangeEvent> {
self.try_take_watch_changes(matcher, Duration::from_secs(10))
.expect("Expected watch changes but observed none")
}
fn try_take_watch_changes<M: MatchEvent>(
&self,
mut matcher: M,
timeout: Duration,
) -> Result<Vec<ChangeEvent>, Vec<ChangeEvent>> {
let watcher = self
.watcher
.as_ref()
.expect("Cannot call `try_take_watch_changes` after `stop_watch`");
let start = Instant::now();
let mut all_events = Vec::new();
loop {
let events = self
.changes_receiver
.recv_timeout(Duration::from_millis(100))
.unwrap_or_default();
if events
.iter()
.any(|event| matcher.match_event(event) || event.is_rescan())
{
all_events.extend(events);
break;
}
all_events.extend(events);
if start.elapsed() > timeout {
return Err(all_events);
}
}
while let Ok(event) = self
.changes_receiver
.recv_timeout(Duration::from_millis(10))
{
all_events.extend(event);
watcher.flush();
}
Ok(all_events)
}
fn apply_changes(&mut self, changes: Vec<ChangeEvent>) {
self.db.apply_changes(changes, None);
}
fn update_options(&mut self, options: Options) -> anyhow::Result<()> {
std::fs::write(
self.project_path("pyproject.toml").as_std_path(),
toml::to_string(&PyProject {
project: None,
tool: Some(Tool {
knot: Some(options),
}),
})
.context("Failed to serialize options")?,
)
.context("Failed to write configuration")?;
let changes = self.take_watch_changes(event_for_file("pyproject.toml"));
self.apply_changes(changes);
if let Some(watcher) = &mut self.watcher {
watcher.update(&self.db);
assert!(!watcher.has_errored_paths());
}
Ok(())
}
fn collect_project_files(&self) -> Vec<File> {
let files = self.db().project().files(self.db());
let mut collected: Vec<_> = files.into_iter().collect();
collected.sort_unstable_by_key(|file| file.path(self.db()).as_system_path().unwrap());
collected
}
fn system_file(&self, path: impl AsRef<SystemPath>) -> Result<File, FileError> {
system_path_to_file(self.db(), path.as_ref())
}
}
trait MatchEvent {
fn match_event(&mut self, event: &ChangeEvent) -> bool;
}
fn event_for_file(name: &str) -> impl MatchEvent + '_ {
|event: &ChangeEvent| event.file_name() == Some(name)
}
impl<F> MatchEvent for F
where
F: FnMut(&ChangeEvent) -> bool,
{
fn match_event(&mut self, event: &ChangeEvent) -> bool {
(*self)(event)
}
}
trait SetupFiles {
fn setup(self, root_path: &SystemPath, project_path: &SystemPath) -> anyhow::Result<()>;
}
impl<const N: usize, P> SetupFiles for [(P, &'static str); N]
where
P: AsRef<SystemPath>,
{
fn setup(self, _root_path: &SystemPath, project_path: &SystemPath) -> anyhow::Result<()> {
for (relative_path, content) in self {
let relative_path = relative_path.as_ref();
let absolute_path = project_path.join(relative_path);
if let Some(parent) = absolute_path.parent() {
std::fs::create_dir_all(parent).with_context(|| {
format!("Failed to create parent directory for file `{relative_path}`")
})?;
}
let mut file = std::fs::File::create(absolute_path.as_std_path())
.with_context(|| format!("Failed to open file `{relative_path}`"))?;
file.write_all(content.as_bytes())
.with_context(|| format!("Failed to write to file `{relative_path}`"))?;
file.sync_data()?;
}
Ok(())
}
}
impl<F> SetupFiles for F
where
F: FnOnce(&SystemPath, &SystemPath) -> anyhow::Result<()>,
{
fn setup(self, root_path: &SystemPath, project_path: &SystemPath) -> anyhow::Result<()> {
self(root_path, project_path)
}
}
fn setup<F>(setup_files: F) -> anyhow::Result<TestCase>
where
F: SetupFiles,
{
setup_with_options(setup_files, |_root, _project_path| None)
}
// TODO: Replace with configuration?
fn setup_with_options<F>(
setup_files: F,
create_options: impl FnOnce(&SystemPath, &SystemPath) -> Option<Options>,
) -> anyhow::Result<TestCase>
where
F: SetupFiles,
{
let temp_dir = tempfile::tempdir()?;
let root_path = SystemPath::from_std_path(temp_dir.path()).ok_or_else(|| {
anyhow!(
"Temporary directory `{}` is not a valid UTF-8 path.",
temp_dir.path().display()
)
})?;
let root_path = SystemPathBuf::from_utf8_path_buf(
root_path
.as_utf8_path()
.canonicalize_utf8()
.with_context(|| "Failed to canonicalize root path.")?,
)
.simplified()
.to_path_buf();
let project_path = root_path.join("project");
std::fs::create_dir_all(project_path.as_std_path())
.with_context(|| format!("Failed to create project directory `{project_path}`"))?;
setup_files
.setup(&root_path, &project_path)
.context("Failed to setup test files")?;
let system = OsSystem::new(&project_path);
if let Some(options) = create_options(&root_path, &project_path) {
std::fs::write(
project_path.join("pyproject.toml").as_std_path(),
toml::to_string(&PyProject {
project: None,
tool: Some(Tool {
knot: Some(options),
}),
})
.context("Failed to serialize options")?,
)
.context("Failed to write configuration")?;
}
let project = ProjectMetadata::discover(&project_path, &system)?;
let program_settings = project.to_program_settings(&system);
for path in program_settings
.search_paths
.extra_paths
.iter()
.chain(program_settings.search_paths.typeshed.as_ref())
.chain(program_settings.search_paths.site_packages.paths())
{
std::fs::create_dir_all(path.as_std_path())
.with_context(|| format!("Failed to create search path `{path}`"))?;
}
let db = ProjectDatabase::new(project, system)?;
let (sender, receiver) = crossbeam::channel::unbounded();
let watcher = directory_watcher(move |events| sender.send(events).unwrap())
.with_context(|| "Failed to create directory watcher")?;
let watcher = ProjectWatcher::new(watcher, &db);
assert!(!watcher.has_errored_paths());
let test_case = TestCase {
db,
changes_receiver: receiver,
watcher: Some(watcher),
_temp_dir: temp_dir,
root_dir: root_path,
};
// Sometimes the file watcher reports changes for events that happened before the watcher was started.
// Do a best effort at dropping these events.
let _ =
test_case.try_take_watch_changes(|_event: &ChangeEvent| true, Duration::from_millis(100));
Ok(test_case)
}
/// Updates the content of a file and ensures that the last modified file time is updated.
fn update_file(path: impl AsRef<SystemPath>, content: &str) -> anyhow::Result<()> {
let path = path.as_ref().as_std_path();
let metadata = path.metadata()?;
let last_modified_time = filetime::FileTime::from_last_modification_time(&metadata);
let mut file = std::fs::OpenOptions::new()
.create(false)
.write(true)
.truncate(true)
.open(path)?;
file.write_all(content.as_bytes())?;
loop {
file.sync_all()?;
let modified_time = filetime::FileTime::from_last_modification_time(&path.metadata()?);
if modified_time != last_modified_time {
break Ok(());
}
std::thread::sleep(Duration::from_nanos(10));
filetime::set_file_handle_times(&file, None, Some(filetime::FileTime::now()))?;
}
}
#[test]
fn new_file() -> anyhow::Result<()> {
let mut case = setup([("bar.py", "")])?;
let bar_path = case.project_path("bar.py");
let bar_file = case.system_file(&bar_path).unwrap();
let foo_path = case.project_path("foo.py");
assert_eq!(case.system_file(&foo_path), Err(FileError::NotFound));
assert_eq!(&case.collect_project_files(), &[bar_file]);
std::fs::write(foo_path.as_std_path(), "print('Hello')")?;
let changes = case.stop_watch(event_for_file("foo.py"));
case.apply_changes(changes);
let foo = case.system_file(&foo_path).expect("foo.py to exist.");
assert_eq!(&case.collect_project_files(), &[bar_file, foo]);
Ok(())
}
#[test]
fn new_ignored_file() -> anyhow::Result<()> {
let mut case = setup([("bar.py", ""), (".ignore", "foo.py")])?;
let bar_path = case.project_path("bar.py");
let bar_file = case.system_file(&bar_path).unwrap();
let foo_path = case.project_path("foo.py");
assert_eq!(case.system_file(&foo_path), Err(FileError::NotFound));
assert_eq!(&case.collect_project_files(), &[bar_file]);
std::fs::write(foo_path.as_std_path(), "print('Hello')")?;
let changes = case.stop_watch(event_for_file("foo.py"));
case.apply_changes(changes);
assert!(case.system_file(&foo_path).is_ok());
assert_eq!(&case.collect_project_files(), &[bar_file]);
Ok(())
}
#[test]
fn changed_file() -> anyhow::Result<()> {
let foo_source = "print('Hello, world!')";
let mut case = setup([("foo.py", foo_source)])?;
let foo_path = case.project_path("foo.py");
let foo = case.system_file(&foo_path)?;
assert_eq!(source_text(case.db(), foo).as_str(), foo_source);
assert_eq!(&case.collect_project_files(), &[foo]);
update_file(&foo_path, "print('Version 2')")?;
let changes = case.stop_watch(event_for_file("foo.py"));
assert!(!changes.is_empty());
case.apply_changes(changes);
assert_eq!(source_text(case.db(), foo).as_str(), "print('Version 2')");
assert_eq!(&case.collect_project_files(), &[foo]);
Ok(())
}
#[test]
fn deleted_file() -> anyhow::Result<()> {
let foo_source = "print('Hello, world!')";
let mut case = setup([("foo.py", foo_source)])?;
let foo_path = case.project_path("foo.py");
let foo = case.system_file(&foo_path)?;
assert!(foo.exists(case.db()));
assert_eq!(&case.collect_project_files(), &[foo]);
std::fs::remove_file(foo_path.as_std_path())?;
let changes = case.stop_watch(event_for_file("foo.py"));
case.apply_changes(changes);
assert!(!foo.exists(case.db()));
assert_eq!(&case.collect_project_files(), &[] as &[File]);
Ok(())
}
/// Tests the case where a file is moved from inside a watched directory to a directory that is not watched.
///
/// This matches the behavior of deleting a file in VS code.
#[test]
fn move_file_to_trash() -> anyhow::Result<()> {
let foo_source = "print('Hello, world!')";
let mut case = setup([("foo.py", foo_source)])?;
let foo_path = case.project_path("foo.py");
let trash_path = case.root_path().join(".trash");
std::fs::create_dir_all(trash_path.as_std_path())?;
let foo = case.system_file(&foo_path)?;
assert!(foo.exists(case.db()));
assert_eq!(&case.collect_project_files(), &[foo]);
std::fs::rename(
foo_path.as_std_path(),
trash_path.join("foo.py").as_std_path(),
)?;
let changes = case.stop_watch(event_for_file("foo.py"));
case.apply_changes(changes);
assert!(!foo.exists(case.db()));
assert_eq!(&case.collect_project_files(), &[] as &[File]);
Ok(())
}
/// Move a file from a non-project (non-watched) location into the project.
#[test]
fn move_file_to_project() -> anyhow::Result<()> {
let mut case = setup([("bar.py", "")])?;
let bar_path = case.project_path("bar.py");
let bar = case.system_file(&bar_path).unwrap();
let foo_path = case.root_path().join("foo.py");
std::fs::write(foo_path.as_std_path(), "")?;
let foo_in_project = case.project_path("foo.py");
assert!(case.system_file(&foo_path).is_ok());
assert_eq!(&case.collect_project_files(), &[bar]);
std::fs::rename(foo_path.as_std_path(), foo_in_project.as_std_path())?;
let changes = case.stop_watch(event_for_file("foo.py"));
case.apply_changes(changes);
let foo_in_project = case.system_file(&foo_in_project)?;
assert!(foo_in_project.exists(case.db()));
assert_eq!(&case.collect_project_files(), &[bar, foo_in_project]);
Ok(())
}
/// Rename a project file.
#[test]
fn rename_file() -> anyhow::Result<()> {
let mut case = setup([("foo.py", "")])?;
let foo_path = case.project_path("foo.py");
let bar_path = case.project_path("bar.py");
let foo = case.system_file(&foo_path)?;
assert_eq!(case.collect_project_files(), [foo]);
std::fs::rename(foo_path.as_std_path(), bar_path.as_std_path())?;
let changes = case.stop_watch(event_for_file("bar.py"));
case.apply_changes(changes);
assert!(!foo.exists(case.db()));
let bar = case.system_file(&bar_path)?;
assert!(bar.exists(case.db()));
assert_eq!(case.collect_project_files(), [bar]);
Ok(())
}
#[test]
fn directory_moved_to_project() -> anyhow::Result<()> {
let mut case = setup([("bar.py", "import sub.a")])?;
let bar = case.system_file(case.project_path("bar.py")).unwrap();
let sub_original_path = case.root_path().join("sub");
let init_original_path = sub_original_path.join("__init__.py");
let a_original_path = sub_original_path.join("a.py");
std::fs::create_dir(sub_original_path.as_std_path())
.with_context(|| "Failed to create sub directory")?;
std::fs::write(init_original_path.as_std_path(), "")
.with_context(|| "Failed to create __init__.py")?;
std::fs::write(a_original_path.as_std_path(), "").with_context(|| "Failed to create a.py")?;
let sub_a_module = resolve_module(
case.db().upcast(),
&ModuleName::new_static("sub.a").unwrap(),
);
assert_eq!(sub_a_module, None);
assert_eq!(case.collect_project_files(), &[bar]);
let sub_new_path = case.project_path("sub");
std::fs::rename(sub_original_path.as_std_path(), sub_new_path.as_std_path())
.with_context(|| "Failed to move sub directory")?;
let changes = case.stop_watch(event_for_file("sub"));
case.apply_changes(changes);
let init_file = case
.system_file(sub_new_path.join("__init__.py"))
.expect("__init__.py to exist");
let a_file = case
.system_file(sub_new_path.join("a.py"))
.expect("a.py to exist");
// `import sub.a` should now resolve
assert!(resolve_module(
case.db().upcast(),
&ModuleName::new_static("sub.a").unwrap()
)
.is_some());
assert_eq!(case.collect_project_files(), &[bar, init_file, a_file]);
Ok(())
}
#[test]
fn directory_moved_to_trash() -> anyhow::Result<()> {
let mut case = setup([
("bar.py", "import sub.a"),
("sub/__init__.py", ""),
("sub/a.py", ""),
])?;
let bar = case.system_file(case.project_path("bar.py")).unwrap();
assert!(resolve_module(
case.db().upcast(),
&ModuleName::new_static("sub.a").unwrap()
)
.is_some());
let sub_path = case.project_path("sub");
let init_file = case
.system_file(sub_path.join("__init__.py"))
.expect("__init__.py to exist");
let a_file = case
.system_file(sub_path.join("a.py"))
.expect("a.py to exist");
assert_eq!(case.collect_project_files(), &[bar, init_file, a_file]);
std::fs::create_dir(case.root_path().join(".trash").as_std_path())?;
let trashed_sub = case.root_path().join(".trash/sub");
std::fs::rename(sub_path.as_std_path(), trashed_sub.as_std_path())
.with_context(|| "Failed to move the sub directory to the trash")?;
let changes = case.stop_watch(event_for_file("sub"));
case.apply_changes(changes);
// `import sub.a` should no longer resolve
assert!(resolve_module(
case.db().upcast(),
&ModuleName::new_static("sub.a").unwrap()
)
.is_none());
assert!(!init_file.exists(case.db()));
assert!(!a_file.exists(case.db()));
assert_eq!(case.collect_project_files(), &[bar]);
Ok(())
}
#[test]
fn directory_renamed() -> anyhow::Result<()> {
let mut case = setup([
("bar.py", "import sub.a"),
("sub/__init__.py", ""),
("sub/a.py", ""),
])?;
let bar = case.system_file(case.project_path("bar.py")).unwrap();
assert!(resolve_module(
case.db().upcast(),
&ModuleName::new_static("sub.a").unwrap()
)
.is_some());
assert!(resolve_module(
case.db().upcast(),
&ModuleName::new_static("foo.baz").unwrap()
)
.is_none());
let sub_path = case.project_path("sub");
let sub_init = case
.system_file(sub_path.join("__init__.py"))
.expect("__init__.py to exist");
let sub_a = case
.system_file(sub_path.join("a.py"))
.expect("a.py to exist");
assert_eq!(case.collect_project_files(), &[bar, sub_init, sub_a]);
let foo_baz = case.project_path("foo/baz");
std::fs::create_dir(case.project_path("foo").as_std_path())?;
std::fs::rename(sub_path.as_std_path(), foo_baz.as_std_path())
.with_context(|| "Failed to move the sub directory")?;
// Linux and windows only emit an event for the newly created root directory, but not for every new component.
let changes = case.stop_watch(event_for_file("sub"));
case.apply_changes(changes);
// `import sub.a` should no longer resolve
assert!(resolve_module(
case.db().upcast(),
&ModuleName::new_static("sub.a").unwrap()
)
.is_none());
// `import foo.baz` should now resolve
assert!(resolve_module(
case.db().upcast(),
&ModuleName::new_static("foo.baz").unwrap()
)
.is_some());
// The old paths are no longer tracked
assert!(!sub_init.exists(case.db()));
assert!(!sub_a.exists(case.db()));
let foo_baz_init = case
.system_file(foo_baz.join("__init__.py"))
.expect("__init__.py to exist");
let foo_baz_a = case
.system_file(foo_baz.join("a.py"))
.expect("a.py to exist");
// The new paths are synced
assert!(foo_baz_init.exists(case.db()));
assert!(foo_baz_a.exists(case.db()));
assert_eq!(
case.collect_project_files(),
&[bar, foo_baz_init, foo_baz_a]
);
Ok(())
}
#[test]
fn directory_deleted() -> anyhow::Result<()> {
let mut case = setup([
("bar.py", "import sub.a"),
("sub/__init__.py", ""),
("sub/a.py", ""),
])?;
let bar = case.system_file(case.project_path("bar.py")).unwrap();
assert!(resolve_module(
case.db().upcast(),
&ModuleName::new_static("sub.a").unwrap()
)
.is_some());
let sub_path = case.project_path("sub");
let init_file = case
.system_file(sub_path.join("__init__.py"))
.expect("__init__.py to exist");
let a_file = case
.system_file(sub_path.join("a.py"))
.expect("a.py to exist");
assert_eq!(case.collect_project_files(), &[bar, init_file, a_file]);
std::fs::remove_dir_all(sub_path.as_std_path())
.with_context(|| "Failed to remove the sub directory")?;
let changes = case.stop_watch(event_for_file("sub"));
case.apply_changes(changes);
// `import sub.a` should no longer resolve
assert!(resolve_module(
case.db().upcast(),
&ModuleName::new_static("sub.a").unwrap()
)
.is_none());
assert!(!init_file.exists(case.db()));
assert!(!a_file.exists(case.db()));
assert_eq!(case.collect_project_files(), &[bar]);
Ok(())
}
#[test]
fn search_path() -> anyhow::Result<()> {
let mut case = setup_with_options([("bar.py", "import sub.a")], |root_path, _project_path| {
Some(Options {
environment: Some(EnvironmentOptions {
venv_path: Some(SitePackages::Known(vec![root_path.join("site_packages")])),
..EnvironmentOptions::default()
}),
..Options::default()
})
})?;
let site_packages = case.root_path().join("site_packages");
assert_eq!(
resolve_module(case.db(), &ModuleName::new("a").unwrap()),
None
);
std::fs::write(site_packages.join("a.py").as_std_path(), "class A: ...")?;
let changes = case.stop_watch(event_for_file("a.py"));
case.apply_changes(changes);
assert!(resolve_module(case.db().upcast(), &ModuleName::new_static("a").unwrap()).is_some());
assert_eq!(
case.collect_project_files(),
&[case.system_file(case.project_path("bar.py")).unwrap()]
);
Ok(())
}
#[test]
fn add_search_path() -> anyhow::Result<()> {
let mut case = setup([("bar.py", "import sub.a")])?;
let site_packages = case.project_path("site_packages");
std::fs::create_dir_all(site_packages.as_std_path())?;
assert!(resolve_module(case.db().upcast(), &ModuleName::new_static("a").unwrap()).is_none());
// Register site-packages as a search path.
case.update_options(Options {
environment: Some(EnvironmentOptions {
venv_path: Some(SitePackages::Known(vec![site_packages.clone()])),
..EnvironmentOptions::default()
}),
..Options::default()
})
.expect("Search path settings to be valid");
std::fs::write(site_packages.join("a.py").as_std_path(), "class A: ...")?;
let changes = case.stop_watch(event_for_file("a.py"));
case.apply_changes(changes);
assert!(resolve_module(case.db().upcast(), &ModuleName::new_static("a").unwrap()).is_some());
Ok(())
}
#[test]
fn remove_search_path() -> anyhow::Result<()> {
let mut case = setup_with_options([("bar.py", "import sub.a")], |root_path, _project_path| {
Some(Options {
environment: Some(EnvironmentOptions {
venv_path: Some(SitePackages::Known(vec![root_path.join("site_packages")])),
..EnvironmentOptions::default()
}),
..Options::default()
})
})?;
// Remove site packages from the search path settings.
let site_packages = case.root_path().join("site_packages");
case.update_options(Options {
environment: None,
..Options::default()
})
.expect("Search path settings to be valid");
std::fs::write(site_packages.join("a.py").as_std_path(), "class A: ...")?;
let changes = case.try_stop_watch(|_: &ChangeEvent| true, Duration::from_millis(100));
assert_eq!(changes, Err(vec![]));
Ok(())
}
#[test]
fn change_python_version_and_platform() -> anyhow::Result<()> {
let mut case = setup_with_options(
// `sys.last_exc` is a Python 3.12 only feature
// `os.getegid()` is Unix only
[(
"bar.py",
r#"
import sys
import os
print(sys.last_exc, os.getegid())
"#,
)],
|_root_path, _project_path| {
Some(Options {
environment: Some(EnvironmentOptions {
python_version: Some(PythonVersion::PY311),
python_platform: Some(PythonPlatform::Identifier("win32".to_string())),
..EnvironmentOptions::default()
}),
..Options::default()
})
},
)?;
let diagnostics = case.db.check().context("Failed to check project.")?;
assert_eq!(diagnostics.len(), 2);
assert_eq!(
diagnostics[0].message(),
"Type `<module 'sys'>` has no attribute `last_exc`"
);
assert_eq!(
diagnostics[1].message(),
"Type `<module 'os'>` has no attribute `getegid`"
);
// Change the python version
case.update_options(Options {
environment: Some(EnvironmentOptions {
python_version: Some(PythonVersion::PY312),
python_platform: Some(PythonPlatform::Identifier("linux".to_string())),
..EnvironmentOptions::default()
}),
..Options::default()
})
.expect("Search path settings to be valid");
let diagnostics = case.db.check().context("Failed to check project.")?;
assert!(diagnostics.is_empty());
Ok(())
}
#[test]
fn changed_versions_file() -> anyhow::Result<()> {
let mut case = setup_with_options(
|root_path: &SystemPath, project_path: &SystemPath| {
std::fs::write(project_path.join("bar.py").as_std_path(), "import sub.a")?;
std::fs::create_dir_all(root_path.join("typeshed/stdlib").as_std_path())?;
std::fs::write(root_path.join("typeshed/stdlib/VERSIONS").as_std_path(), "")?;
std::fs::write(
root_path.join("typeshed/stdlib/os.pyi").as_std_path(),
"# not important",
)?;
Ok(())
},
|root_path, _project_path| {
Some(Options {
environment: Some(EnvironmentOptions {
typeshed: Some(root_path.join("typeshed")),
..EnvironmentOptions::default()
}),
..Options::default()
})
},
)?;
// Unset the custom typeshed directory.
assert_eq!(
resolve_module(case.db(), &ModuleName::new("os").unwrap()),
None
);
std::fs::write(
case.root_path()
.join("typeshed/stdlib/VERSIONS")
.as_std_path(),
"os: 3.0-",
)?;
let changes = case.stop_watch(event_for_file("VERSIONS"));
case.apply_changes(changes);
assert!(resolve_module(case.db(), &ModuleName::new("os").unwrap()).is_some());
Ok(())
}
/// Watch a project that contains two files where one file is a hardlink to another.
///
/// Setup:
/// ```text
/// - project
/// |- foo.py
/// |- bar.py (hard link to foo.py)
/// ```
///
/// # Linux
/// `inotify` only emits a single change event for the file that was changed.
/// Other files that point to the same inode (hardlinks) won't get updated.
///
/// For reference: VS Code and PyCharm have the same behavior where the results for one of the
/// files are stale.
///
/// # Windows
/// I haven't found any documentation that states the notification behavior on Windows but what
/// we're seeing is that Windows only emits a single event, similar to Linux.
#[test]
fn hard_links_in_project() -> anyhow::Result<()> {
let mut case = setup(|_root: &SystemPath, project: &SystemPath| {
let foo_path = project.join("foo.py");
std::fs::write(foo_path.as_std_path(), "print('Version 1')")?;
// Create a hardlink to `foo`
let bar_path = project.join("bar.py");
std::fs::hard_link(foo_path.as_std_path(), bar_path.as_std_path())
.context("Failed to create hard link from foo.py -> bar.py")?;
Ok(())
})?;
let foo_path = case.project_path("foo.py");
let foo = case.system_file(&foo_path).unwrap();
let bar_path = case.project_path("bar.py");
let bar = case.system_file(&bar_path).unwrap();
assert_eq!(source_text(case.db(), foo).as_str(), "print('Version 1')");
assert_eq!(source_text(case.db(), bar).as_str(), "print('Version 1')");
// Write to the hard link target.
update_file(foo_path, "print('Version 2')").context("Failed to update foo.py")?;
let changes = case.stop_watch(event_for_file("foo.py"));
case.apply_changes(changes);
assert_eq!(source_text(case.db(), foo).as_str(), "print('Version 2')");
// macOS is the only platform that emits events for every hardlink.
if cfg!(target_os = "macos") {
assert_eq!(source_text(case.db(), bar).as_str(), "print('Version 2')");
}
Ok(())
}
/// Watch a project that contains one file that is a hardlink to a file outside the project.
///
/// Setup:
/// ```text
/// - foo.py
/// - project
/// |- bar.py (hard link to /foo.py)
/// ```
///
/// # Linux
/// inotiyf doesn't support observing changes to hard linked files.
///
/// > Note: when monitoring a directory, events are not generated for
/// > the files inside the directory when the events are performed via
/// > a pathname (i.e., a link) that lies outside the monitored
/// > directory. [source](https://man7.org/linux/man-pages/man7/inotify.7.html)
///
/// # Windows
/// > Retrieves information that describes the changes within the specified directory.
///
/// [source](https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-readdirectorychangesw)
///
/// My interpretation of this is that Windows doesn't support observing changes made to
/// hard linked files outside the project.
#[test]
#[cfg_attr(
target_os = "linux",
ignore = "inotify doesn't support observing changes to hard linked files."
)]
#[cfg_attr(
target_os = "windows",
ignore = "windows doesn't support observing changes to hard linked files."
)]
fn hard_links_to_target_outside_project() -> anyhow::Result<()> {
let mut case = setup(|root: &SystemPath, project: &SystemPath| {
let foo_path = root.join("foo.py");
std::fs::write(foo_path.as_std_path(), "print('Version 1')")?;
// Create a hardlink to `foo`
let bar_path = project.join("bar.py");
std::fs::hard_link(foo_path.as_std_path(), bar_path.as_std_path())
.context("Failed to create hard link from foo.py -> bar.py")?;
Ok(())
})?;
let foo_path = case.root_path().join("foo.py");
let foo = case.system_file(&foo_path).unwrap();
let bar_path = case.project_path("bar.py");
let bar = case.system_file(&bar_path).unwrap();
assert_eq!(source_text(case.db(), foo).as_str(), "print('Version 1')");
assert_eq!(source_text(case.db(), bar).as_str(), "print('Version 1')");
// Write to the hard link target.
update_file(foo_path, "print('Version 2')").context("Failed to update foo.py")?;
let changes = case.stop_watch(ChangeEvent::is_changed);
case.apply_changes(changes);
assert_eq!(source_text(case.db(), bar).as_str(), "print('Version 2')");
Ok(())
}
#[cfg(unix)]
mod unix {
//! Tests that make use of unix specific file-system features.
use super::*;
/// Changes the metadata of the only file in the project.
#[test]
fn changed_metadata() -> anyhow::Result<()> {
use std::os::unix::fs::PermissionsExt;
let mut case = setup([("foo.py", "")])?;
let foo_path = case.project_path("foo.py");
let foo = case.system_file(&foo_path)?;
assert_eq!(
foo.permissions(case.db()),
Some(
std::fs::metadata(foo_path.as_std_path())
.unwrap()
.permissions()
.mode()
)
);
std::fs::set_permissions(
foo_path.as_std_path(),
std::fs::Permissions::from_mode(0o777),
)
.with_context(|| "Failed to set file permissions.")?;
let changes = case.stop_watch(event_for_file("foo.py"));
case.apply_changes(changes);
assert_eq!(
foo.permissions(case.db()),
Some(
std::fs::metadata(foo_path.as_std_path())
.unwrap()
.permissions()
.mode()
)
);
Ok(())
}
/// A project path is a symlink to a file outside the project.
///
/// Setup:
/// ```text
/// - bar
/// |- baz.py
///
/// - project
/// |- bar -> /bar
/// ```
///
/// # macOS
/// This test case isn't supported on macOS.
/// macOS uses `FSEvents` and `FSEvents` doesn't emit an event if a file in a symlinked directory is changed.
///
/// > Generally speaking, when working with file system event notifications, you will probably want to use lstat,
/// > because changes to the underlying file will not result in a change notification for the directory containing
/// > the symbolic link to that file. However, if you are working with a controlled file structure in
/// > which symbolic links always point within your watched tree, you might have reason to use stat.
///
/// [source](https://developer.apple.com/library/archive/documentation/Darwin/Conceptual/FSEvents_ProgGuide/UsingtheFSEventsFramework/UsingtheFSEventsFramework.html#//apple_ref/doc/uid/TP40005289-CH4-SW4)
///
/// Pyright also does not support this case.
#[test]
#[cfg_attr(
target_os = "macos",
ignore = "FSEvents doesn't emit change events for symlinked directories outside of the watched paths."
)]
fn symlink_target_outside_watched_paths() -> anyhow::Result<()> {
let mut case = setup(|root: &SystemPath, project: &SystemPath| {
// Set up the symlink target.
let link_target = root.join("bar");
std::fs::create_dir_all(link_target.as_std_path())
.context("Failed to create link target directory")?;
let baz_original = link_target.join("baz.py");
std::fs::write(baz_original.as_std_path(), "def baz(): ...")
.context("Failed to write link target file")?;
// Create a symlink inside the project
let bar = project.join("bar");
std::os::unix::fs::symlink(link_target.as_std_path(), bar.as_std_path())
.context("Failed to create symlink to bar package")?;
Ok(())
})?;
let baz = resolve_module(
case.db().upcast(),
&ModuleName::new_static("bar.baz").unwrap(),
)
.expect("Expected bar.baz to exist in site-packages.");
let baz_project = case.project_path("bar/baz.py");
assert_eq!(
source_text(case.db(), baz.file()).as_str(),
"def baz(): ..."
);
assert_eq!(
baz.file().path(case.db()).as_system_path(),
Some(&*baz_project)
);
let baz_original = case.root_path().join("bar/baz.py");
// Write to the symlink target.
update_file(baz_original, "def baz(): print('Version 2')")
.context("Failed to update bar/baz.py")?;
let changes = case.take_watch_changes(event_for_file("baz.py"));
case.apply_changes(changes);
assert_eq!(
source_text(case.db(), baz.file()).as_str(),
"def baz(): print('Version 2')"
);
// Write to the symlink source.
update_file(baz_project, "def baz(): print('Version 3')")
.context("Failed to update bar/baz.py")?;
let changes = case.stop_watch(event_for_file("baz.py"));
case.apply_changes(changes);
assert_eq!(
source_text(case.db(), baz.file()).as_str(),
"def baz(): print('Version 3')"
);
Ok(())
}
/// Project contains a symlink to another directory inside the project.
/// Changes to files in the symlinked directory should be reflected
/// to all files.
///
/// Setup:
/// ```text
/// - project
/// | - bar -> /project/patched/bar
/// |
/// | - patched
/// | |-- bar
/// | | |- baz.py
/// |
/// |-- foo.py
/// ```
#[test]
fn symlink_inside_project() -> anyhow::Result<()> {
let mut case = setup(|_root: &SystemPath, project: &SystemPath| {
// Set up the symlink target.
let link_target = project.join("patched/bar");
std::fs::create_dir_all(link_target.as_std_path())
.context("Failed to create link target directory")?;
let baz_original = link_target.join("baz.py");
std::fs::write(baz_original.as_std_path(), "def baz(): ...")
.context("Failed to write link target file")?;
// Create a symlink inside site-packages
let bar_in_project = project.join("bar");
std::os::unix::fs::symlink(link_target.as_std_path(), bar_in_project.as_std_path())
.context("Failed to create symlink to bar package")?;
Ok(())
})?;
let baz = resolve_module(
case.db().upcast(),
&ModuleName::new_static("bar.baz").unwrap(),
)
.expect("Expected bar.baz to exist in site-packages.");
let bar_baz = case.project_path("bar/baz.py");
let patched_bar_baz = case.project_path("patched/bar/baz.py");
let patched_bar_baz_file = case.system_file(&patched_bar_baz).unwrap();
assert_eq!(
source_text(case.db(), patched_bar_baz_file).as_str(),
"def baz(): ..."
);
assert_eq!(
source_text(case.db(), baz.file()).as_str(),
"def baz(): ..."
);
assert_eq!(baz.file().path(case.db()).as_system_path(), Some(&*bar_baz));
// Write to the symlink target.
update_file(&patched_bar_baz, "def baz(): print('Version 2')")
.context("Failed to update bar/baz.py")?;
let changes = case.stop_watch(event_for_file("baz.py"));
case.apply_changes(changes);
// The file watcher is guaranteed to emit one event for the changed file, but it isn't specified
// if the event is emitted for the "original" or linked path because both paths are watched.
// The best we can assert here is that one of the files should have been updated.
//
// In a perfect world, the file watcher would emit two events, one for the original file and
// one for the symlink. I tried parcel/watcher, node's `fs.watch` and `chokidar` and
// only `chokidar seems to support it (used by Pyright).
//
// I further tested how good editor support is for symlinked files and it is not good ;)
// * VS Code doesn't update the file content if a file gets changed through a symlink
// * PyCharm doesn't update diagnostics if a symlinked module is changed (same as red knot).
//
// That's why I think it's fine to not support this case for now.
let patched_baz_text = source_text(case.db(), patched_bar_baz_file);
let did_update_patched_baz = patched_baz_text.as_str() == "def baz(): print('Version 2')";
let bar_baz_text = source_text(case.db(), baz.file());
let did_update_bar_baz = bar_baz_text.as_str() == "def baz(): print('Version 2')";
assert!(
did_update_patched_baz || did_update_bar_baz,
"Expected one of the files to be updated but neither file was updated.\nOriginal: {patched_baz_text}\nSymlinked: {bar_baz_text}",
patched_baz_text = patched_baz_text.as_str(),
bar_baz_text = bar_baz_text.as_str()
);
Ok(())
}
/// A module search path is a symlink.
///
/// Setup:
/// ```text
/// - site-packages
/// | - bar/baz.py
///
/// - project
/// |-- .venv/lib/python3.12/site-packages -> /site-packages
/// |
/// |-- foo.py
/// ```
#[test]
fn symlinked_module_search_path() -> anyhow::Result<()> {
let mut case = setup_with_options(
|root: &SystemPath, project: &SystemPath| {
// Set up the symlink target.
let site_packages = root.join("site-packages");
let bar = site_packages.join("bar");
std::fs::create_dir_all(bar.as_std_path())
.context("Failed to create bar directory")?;
let baz_original = bar.join("baz.py");
std::fs::write(baz_original.as_std_path(), "def baz(): ...")
.context("Failed to write baz.py")?;
// Symlink the site packages in the venv to the global site packages
let venv_site_packages = project.join(".venv/lib/python3.12/site-packages");
std::fs::create_dir_all(venv_site_packages.parent().unwrap())
.context("Failed to create .venv directory")?;
std::os::unix::fs::symlink(
site_packages.as_std_path(),
venv_site_packages.as_std_path(),
)
.context("Failed to create symlink to site-packages")?;
Ok(())
},
|_root, project| {
Some(Options {
environment: Some(EnvironmentOptions {
venv_path: Some(SitePackages::Known(vec![
project.join(".venv/lib/python3.12/site-packages")
])),
..EnvironmentOptions::default()
}),
..Options::default()
})
},
)?;
let baz = resolve_module(
case.db().upcast(),
&ModuleName::new_static("bar.baz").unwrap(),
)
.expect("Expected bar.baz to exist in site-packages.");
let baz_site_packages_path =
case.project_path(".venv/lib/python3.12/site-packages/bar/baz.py");
let baz_site_packages = case.system_file(&baz_site_packages_path).unwrap();
let baz_original = case.root_path().join("site-packages/bar/baz.py");
let baz_original_file = case.system_file(&baz_original).unwrap();
assert_eq!(
source_text(case.db(), baz_original_file).as_str(),
"def baz(): ..."
);
assert_eq!(
source_text(case.db(), baz_site_packages).as_str(),
"def baz(): ..."
);
assert_eq!(
baz.file().path(case.db()).as_system_path(),
Some(&*baz_original)
);
// Write to the symlink target.
update_file(&baz_original, "def baz(): print('Version 2')")
.context("Failed to update bar/baz.py")?;
let changes = case.stop_watch(event_for_file("baz.py"));
case.apply_changes(changes);
assert_eq!(
source_text(case.db(), baz_original_file).as_str(),
"def baz(): print('Version 2')"
);
// It would be nice if this is supported but the underlying file system watchers
// only emit a single event. For reference
// * VS Code doesn't update the file content if a file gets changed through a symlink
// * PyCharm doesn't update diagnostics if a symlinked module is changed (same as red knot).
// We could add support for it by keeping a reverse map from `real_path` to symlinked path but
// it doesn't seem worth doing considering that as prominent tools like PyCharm don't support it.
// Pyright does support it, thanks to chokidar.
assert_ne!(
source_text(case.db(), baz_site_packages).as_str(),
"def baz(): print('Version 2')"
);
Ok(())
}
}
#[test]
fn nested_projects_delete_root() -> anyhow::Result<()> {
let mut case = setup(|root: &SystemPath, project_root: &SystemPath| {
std::fs::write(
project_root.join("pyproject.toml").as_std_path(),
r#"
[project]
name = "inner"
[tool.knot]
"#,
)?;
std::fs::write(
root.join("pyproject.toml").as_std_path(),
r#"
[project]
name = "outer"
[tool.knot]
"#,
)?;
Ok(())
})?;
assert_eq!(case.db().project().root(case.db()), &*case.project_path(""));
std::fs::remove_file(case.project_path("pyproject.toml").as_std_path())?;
let changes = case.stop_watch(ChangeEvent::is_deleted);
case.apply_changes(changes);
// It should now pick up the outer project.
assert_eq!(case.db().project().root(case.db()), case.root_path());
Ok(())
}