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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
use std::cell::RefCell;
use std::collections::HashMap;
use std::env::current_dir;
use std::io::ErrorKind;
use std::marker::PhantomData;
use std::path::Path;
use std::path::PathBuf;
use std::rc::Rc;
use std::sync::Mutex;
use std::sync::OnceLock;
use async_trait::async_trait;
use deno_core::error::type_error;
use deno_core::error::AnyError;
use deno_core::unsync::spawn_blocking;
use deno_core::OpState;
use deno_node::PathClean;
pub use denokv_sqlite::SqliteBackendError;
use denokv_sqlite::SqliteNotifier;
use rand::RngCore;
use rand::SeedableRng;
use rusqlite::OpenFlags;
use crate::DatabaseHandler;
static SQLITE_NOTIFIERS_MAP: OnceLock<Mutex<HashMap<PathBuf, SqliteNotifier>>> =
OnceLock::new();
pub struct SqliteDbHandler<P: SqliteDbHandlerPermissions + 'static> {
pub default_storage_dir: Option<PathBuf>,
versionstamp_rng_seed: Option<u64>,
_permissions: PhantomData<P>,
}
pub trait SqliteDbHandlerPermissions {
fn check_read(&mut self, p: &Path, api_name: &str) -> Result<(), AnyError>;
fn check_write(&mut self, p: &Path, api_name: &str) -> Result<(), AnyError>;
}
impl<P: SqliteDbHandlerPermissions> SqliteDbHandler<P> {
pub fn new(
default_storage_dir: Option<PathBuf>,
versionstamp_rng_seed: Option<u64>,
) -> Self {
Self {
default_storage_dir,
versionstamp_rng_seed,
_permissions: PhantomData,
}
}
}
#[async_trait(?Send)]
impl<P: SqliteDbHandlerPermissions> DatabaseHandler for SqliteDbHandler<P> {
type DB = denokv_sqlite::Sqlite;
async fn open(
&self,
state: Rc<RefCell<OpState>>,
path: Option<String>,
) -> Result<Self::DB, AnyError> {
// Validate path
if let Some(path) = &path {
if path != ":memory:" {
if path.is_empty() {
return Err(type_error("Filename cannot be empty"));
}
if path.starts_with(':') {
return Err(type_error(
"Filename cannot start with ':' unless prefixed with './'",
));
}
let path = Path::new(path);
{
let mut state = state.borrow_mut();
let permissions = state.borrow_mut::<P>();
permissions.check_read(path, "Deno.openKv")?;
permissions.check_write(path, "Deno.openKv")?;
}
}
}
let path = path.clone();
let default_storage_dir = self.default_storage_dir.clone();
let (conn, notifier_key) = spawn_blocking(move || {
denokv_sqlite::sqlite_retry_loop(|| {
let (conn, notifier_key) = match (path.as_deref(), &default_storage_dir)
{
(Some(":memory:"), _) | (None, None) => {
(rusqlite::Connection::open_in_memory()?, None)
}
(Some(path), _) => {
let flags =
OpenFlags::default().difference(OpenFlags::SQLITE_OPEN_URI);
let resolved_path = canonicalize_path(&PathBuf::from(path))
.map_err(anyhow::Error::from)?;
(
rusqlite::Connection::open_with_flags(path, flags)?,
Some(resolved_path),
)
}
(None, Some(path)) => {
std::fs::create_dir_all(path).map_err(anyhow::Error::from)?;
let path = path.join("kv.sqlite3");
(rusqlite::Connection::open(path.clone())?, Some(path))
}
};
conn.pragma_update(None, "journal_mode", "wal")?;
Ok::<_, SqliteBackendError>((conn, notifier_key))
})
})
.await
.unwrap()?;
let notifier = if let Some(notifier_key) = notifier_key {
SQLITE_NOTIFIERS_MAP
.get_or_init(Default::default)
.lock()
.unwrap()
.entry(notifier_key)
.or_default()
.clone()
} else {
SqliteNotifier::default()
};
let versionstamp_rng: Box<dyn RngCore + Send> =
match &self.versionstamp_rng_seed {
Some(seed) => Box::new(rand::rngs::StdRng::seed_from_u64(*seed)),
None => Box::new(rand::rngs::StdRng::from_entropy()),
};
denokv_sqlite::Sqlite::new(conn, notifier, versionstamp_rng)
}
}
/// Same as Path::canonicalize, but also handles non-existing paths.
fn canonicalize_path(path: &Path) -> Result<PathBuf, AnyError> {
let path = path.to_path_buf().clean();
let mut path = path;
let mut names_stack = Vec::new();
loop {
match path.canonicalize() {
Ok(mut canonicalized_path) => {
for name in names_stack.into_iter().rev() {
canonicalized_path = canonicalized_path.join(name);
}
return Ok(canonicalized_path);
}
Err(err) if err.kind() == ErrorKind::NotFound => {
let file_name = path.file_name().map(|os_str| os_str.to_os_string());
if let Some(file_name) = file_name {
names_stack.push(file_name.to_str().unwrap().to_string());
path = path.parent().unwrap().to_path_buf();
} else {
names_stack.push(path.to_str().unwrap().to_string());
let current_dir = current_dir()?;
path = current_dir.clone();
}
}
Err(err) => return Err(err.into()),
}
}
}
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