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denoland-deno/ext/webstorage/lib.rs

253 lines
6.1 KiB
Rust

// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
// NOTE to all: use **cached** prepared statements when interfacing with SQLite.
use deno_core::error::AnyError;
use deno_core::include_js_files;
use deno_core::op;
use deno_core::Extension;
use deno_core::OpState;
use rusqlite::params;
use rusqlite::Connection;
use rusqlite::OptionalExtension;
use std::fmt;
use std::path::PathBuf;
pub use rusqlite;
#[derive(Clone)]
struct OriginStorageDir(PathBuf);
const MAX_STORAGE_BYTES: u32 = 10 * 1024 * 1024;
pub fn init(origin_storage_dir: Option<PathBuf>) -> Extension {
Extension::builder()
.js(include_js_files!(
prefix "deno:ext/webstorage",
"01_webstorage.js",
))
.ops(vec![
op_webstorage_length::decl(),
op_webstorage_key::decl(),
op_webstorage_set::decl(),
op_webstorage_get::decl(),
op_webstorage_remove::decl(),
op_webstorage_clear::decl(),
op_webstorage_iterate_keys::decl(),
])
.state(move |state| {
if let Some(origin_storage_dir) = &origin_storage_dir {
state.put(OriginStorageDir(origin_storage_dir.clone()));
}
Ok(())
})
.build()
}
pub fn get_declaration() -> PathBuf {
PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("lib.deno_webstorage.d.ts")
}
struct LocalStorage(Connection);
struct SessionStorage(Connection);
fn get_webstorage(
state: &mut OpState,
persistent: bool,
) -> Result<&Connection, AnyError> {
let conn = if persistent {
if state.try_borrow::<LocalStorage>().is_none() {
let path = state.try_borrow::<OriginStorageDir>().ok_or_else(|| {
DomExceptionNotSupportedError::new(
"LocalStorage is not supported in this context.",
)
})?;
std::fs::create_dir_all(&path.0)?;
let conn = Connection::open(path.0.join("local_storage"))?;
// Enable write-ahead-logging and tweak some other stuff.
let initial_pragmas = "
-- enable write-ahead-logging mode
PRAGMA journal_mode=WAL;
PRAGMA synchronous=NORMAL;
PRAGMA temp_store=memory;
PRAGMA page_size=4096;
PRAGMA mmap_size=6000000;
PRAGMA optimize;
";
conn.execute_batch(initial_pragmas)?;
conn.set_prepared_statement_cache_capacity(128);
{
let mut stmt = conn.prepare_cached(
"CREATE TABLE IF NOT EXISTS data (key VARCHAR UNIQUE, value VARCHAR)",
)?;
stmt.execute(params![])?;
}
state.put(LocalStorage(conn));
}
&state.borrow::<LocalStorage>().0
} else {
if state.try_borrow::<SessionStorage>().is_none() {
let conn = Connection::open_in_memory()?;
{
let mut stmt = conn.prepare_cached(
"CREATE TABLE data (key VARCHAR UNIQUE, value VARCHAR)",
)?;
stmt.execute(params![])?;
}
state.put(SessionStorage(conn));
}
&state.borrow::<SessionStorage>().0
};
Ok(conn)
}
#[op]
pub fn op_webstorage_length(
state: &mut OpState,
persistent: bool,
) -> Result<u32, AnyError> {
let conn = get_webstorage(state, persistent)?;
let mut stmt = conn.prepare_cached("SELECT COUNT(*) FROM data")?;
let length: u32 = stmt.query_row(params![], |row| row.get(0))?;
Ok(length)
}
#[op]
pub fn op_webstorage_key(
state: &mut OpState,
index: u32,
persistent: bool,
) -> Result<Option<String>, AnyError> {
let conn = get_webstorage(state, persistent)?;
let mut stmt =
conn.prepare_cached("SELECT key FROM data LIMIT 1 OFFSET ?")?;
let key: Option<String> = stmt
.query_row(params![index], |row| row.get(0))
.optional()?;
Ok(key)
}
#[op]
pub fn op_webstorage_set(
state: &mut OpState,
key: String,
value: String,
persistent: bool,
) -> Result<(), AnyError> {
let conn = get_webstorage(state, persistent)?;
let mut stmt = conn
.prepare_cached("SELECT SUM(pgsize) FROM dbstat WHERE name = 'data'")?;
let size: u32 = stmt.query_row(params![], |row| row.get(0))?;
if size >= MAX_STORAGE_BYTES {
return Err(
deno_web::DomExceptionQuotaExceededError::new(
"Exceeded maximum storage size",
)
.into(),
);
}
let mut stmt = conn
.prepare_cached("INSERT OR REPLACE INTO data (key, value) VALUES (?, ?)")?;
stmt.execute(params![key, value])?;
Ok(())
}
#[op]
pub fn op_webstorage_get(
state: &mut OpState,
key_name: String,
persistent: bool,
) -> Result<Option<String>, AnyError> {
let conn = get_webstorage(state, persistent)?;
let mut stmt = conn.prepare_cached("SELECT value FROM data WHERE key = ?")?;
let val = stmt
.query_row(params![key_name], |row| row.get(0))
.optional()?;
Ok(val)
}
#[op]
pub fn op_webstorage_remove(
state: &mut OpState,
key_name: String,
persistent: bool,
) -> Result<(), AnyError> {
let conn = get_webstorage(state, persistent)?;
let mut stmt = conn.prepare_cached("DELETE FROM data WHERE key = ?")?;
stmt.execute(params![key_name])?;
Ok(())
}
#[op]
pub fn op_webstorage_clear(
state: &mut OpState,
persistent: bool,
) -> Result<(), AnyError> {
let conn = get_webstorage(state, persistent)?;
let mut stmt = conn.prepare_cached("DELETE FROM data")?;
stmt.execute(params![])?;
Ok(())
}
#[op]
pub fn op_webstorage_iterate_keys(
state: &mut OpState,
persistent: bool,
) -> Result<Vec<String>, AnyError> {
let conn = get_webstorage(state, persistent)?;
let mut stmt = conn.prepare_cached("SELECT key FROM data")?;
let keys = stmt
.query_map(params![], |row| row.get::<_, String>(0))?
.map(|r| r.unwrap())
.collect();
Ok(keys)
}
#[derive(Debug)]
pub struct DomExceptionNotSupportedError {
pub msg: String,
}
impl DomExceptionNotSupportedError {
pub fn new(msg: &str) -> Self {
DomExceptionNotSupportedError {
msg: msg.to_string(),
}
}
}
impl fmt::Display for DomExceptionNotSupportedError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.pad(&self.msg)
}
}
impl std::error::Error for DomExceptionNotSupportedError {}
pub fn get_not_supported_error_class_name(
e: &AnyError,
) -> Option<&'static str> {
e.downcast_ref::<DomExceptionNotSupportedError>()
.map(|_| "DOMExceptionNotSupportedError")
}