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#![deny(missing_docs)]
mod error;
mod indexed_db;
use kvdb::{DBTransaction, DBValue};
use kvdb_memorydb::{self as in_memory, InMemory};
use send_wrapper::SendWrapper;
use std::io;
pub use error::Error;
pub use kvdb::KeyValueDB;
use futures::prelude::*;
use web_sys::IdbDatabase;
pub struct Database {
name: String,
version: u32,
columns: u32,
in_memory: InMemory,
indexed_db: SendWrapper<IdbDatabase>,
}
parity_util_mem::malloc_size_of_is_0!(Database);
impl Database {
pub async fn open(name: String, columns: u32) -> Result<Database, error::Error> {
let name_clone = name.clone();
let db = indexed_db::open(name.as_str(), None, columns).await?;
let db = if columns + 1 > db.columns {
let next_version = db.version + 1;
drop(db);
indexed_db::open(name.as_str(), Some(next_version), columns).await?
} else {
db
};
let indexed_db::IndexedDB { version, inner, .. } = db;
let in_memory = in_memory::create(columns);
for column in 0..columns {
let mut txn = DBTransaction::new();
let mut stream = indexed_db::idb_cursor(&*inner, column);
while let Some((key, value)) = stream.next().await {
txn.put_vec(column, key.as_ref(), value);
}
in_memory.write_buffered(txn);
}
Ok(Database { name: name_clone, version, columns, in_memory, indexed_db: inner })
}
pub fn name(&self) -> &str {
self.name.as_str()
}
pub fn version(&self) -> u32 {
self.version
}
}
impl Drop for Database {
fn drop(&mut self) {
self.indexed_db.close();
}
}
impl KeyValueDB for Database {
fn get(&self, col: u32, key: &[u8]) -> io::Result<Option<DBValue>> {
self.in_memory.get(col, key)
}
fn get_by_prefix(&self, col: u32, prefix: &[u8]) -> Option<Box<[u8]>> {
self.in_memory.get_by_prefix(col, prefix)
}
fn write_buffered(&self, transaction: DBTransaction) {
let _ = indexed_db::idb_commit_transaction(&*self.indexed_db, &transaction, self.columns);
self.in_memory.write_buffered(transaction);
}
fn flush(&self) -> io::Result<()> {
Ok(())
}
fn iter<'a>(&'a self, col: u32) -> Box<dyn Iterator<Item = (Box<[u8]>, Box<[u8]>)> + 'a> {
self.in_memory.iter(col)
}
fn iter_from_prefix<'a>(
&'a self,
col: u32,
prefix: &'a [u8],
) -> Box<dyn Iterator<Item = (Box<[u8]>, Box<[u8]>)> + 'a> {
self.in_memory.iter_from_prefix(col, prefix)
}
fn restore(&self, _new_db: &str) -> std::io::Result<()> {
Err(io::Error::new(io::ErrorKind::Other, "Not supported yet"))
}
}