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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
use std::cell::RefCell;
use std::rc::Rc;
use crate::remote::RemoteDbHandlerPermissions;
use crate::sqlite::SqliteDbHandler;
use crate::sqlite::SqliteDbHandlerPermissions;
use crate::AtomicWrite;
use crate::Database;
use crate::DatabaseHandler;
use crate::QueueMessageHandle;
use crate::ReadRange;
use crate::SnapshotReadOptions;
use async_trait::async_trait;
use deno_core::error::type_error;
use deno_core::error::AnyError;
use deno_core::OpState;
use denokv_proto::CommitResult;
use denokv_proto::ReadRangeOutput;
use denokv_proto::WatchStream;
pub struct MultiBackendDbHandler {
backends: Vec<(&'static [&'static str], Box<dyn DynamicDbHandler>)>,
}
impl MultiBackendDbHandler {
pub fn new(
backends: Vec<(&'static [&'static str], Box<dyn DynamicDbHandler>)>,
) -> Self {
Self { backends }
}
pub fn remote_or_sqlite<
P: SqliteDbHandlerPermissions + RemoteDbHandlerPermissions + 'static,
>(
default_storage_dir: Option<std::path::PathBuf>,
versionstamp_rng_seed: Option<u64>,
http_options: crate::remote::HttpOptions,
) -> Self {
Self::new(vec![
(
&["https://", "http://"],
Box::new(crate::remote::RemoteDbHandler::<P>::new(http_options)),
),
(
&[""],
Box::new(SqliteDbHandler::<P>::new(
default_storage_dir,
versionstamp_rng_seed,
)),
),
])
}
}
#[async_trait(?Send)]
impl DatabaseHandler for MultiBackendDbHandler {
type DB = RcDynamicDb;
async fn open(
&self,
state: Rc<RefCell<OpState>>,
path: Option<String>,
) -> Result<Self::DB, AnyError> {
for (prefixes, handler) in &self.backends {
for &prefix in *prefixes {
if prefix.is_empty() {
return handler.dyn_open(state.clone(), path.clone()).await;
}
let Some(path) = &path else {
continue;
};
if path.starts_with(prefix) {
return handler.dyn_open(state.clone(), Some(path.clone())).await;
}
}
}
Err(type_error(format!(
"No backend supports the given path: {:?}",
path
)))
}
}
#[async_trait(?Send)]
pub trait DynamicDbHandler {
async fn dyn_open(
&self,
state: Rc<RefCell<OpState>>,
path: Option<String>,
) -> Result<RcDynamicDb, AnyError>;
}
#[async_trait(?Send)]
impl DatabaseHandler for Box<dyn DynamicDbHandler> {
type DB = RcDynamicDb;
async fn open(
&self,
state: Rc<RefCell<OpState>>,
path: Option<String>,
) -> Result<Self::DB, AnyError> {
(**self).dyn_open(state, path).await
}
}
#[async_trait(?Send)]
impl<T, DB> DynamicDbHandler for T
where
T: DatabaseHandler<DB = DB>,
DB: Database + 'static,
{
async fn dyn_open(
&self,
state: Rc<RefCell<OpState>>,
path: Option<String>,
) -> Result<RcDynamicDb, AnyError> {
Ok(RcDynamicDb(Rc::new(self.open(state, path).await?)))
}
}
#[async_trait(?Send)]
pub trait DynamicDb {
async fn dyn_snapshot_read(
&self,
requests: Vec<ReadRange>,
options: SnapshotReadOptions,
) -> Result<Vec<ReadRangeOutput>, AnyError>;
async fn dyn_atomic_write(
&self,
write: AtomicWrite,
) -> Result<Option<CommitResult>, AnyError>;
async fn dyn_dequeue_next_message(
&self,
) -> Result<Option<Box<dyn QueueMessageHandle>>, AnyError>;
fn dyn_watch(&self, keys: Vec<Vec<u8>>) -> WatchStream;
fn dyn_close(&self);
}
#[derive(Clone)]
pub struct RcDynamicDb(Rc<dyn DynamicDb>);
#[async_trait(?Send)]
impl Database for RcDynamicDb {
type QMH = Box<dyn QueueMessageHandle>;
async fn snapshot_read(
&self,
requests: Vec<ReadRange>,
options: SnapshotReadOptions,
) -> Result<Vec<ReadRangeOutput>, AnyError> {
(*self.0).dyn_snapshot_read(requests, options).await
}
async fn atomic_write(
&self,
write: AtomicWrite,
) -> Result<Option<CommitResult>, AnyError> {
(*self.0).dyn_atomic_write(write).await
}
async fn dequeue_next_message(
&self,
) -> Result<Option<Box<dyn QueueMessageHandle>>, AnyError> {
(*self.0).dyn_dequeue_next_message().await
}
fn watch(&self, keys: Vec<Vec<u8>>) -> WatchStream {
(*self.0).dyn_watch(keys)
}
fn close(&self) {
(*self.0).dyn_close()
}
}
#[async_trait(?Send)]
impl<T, QMH> DynamicDb for T
where
T: Database<QMH = QMH>,
QMH: QueueMessageHandle + 'static,
{
async fn dyn_snapshot_read(
&self,
requests: Vec<ReadRange>,
options: SnapshotReadOptions,
) -> Result<Vec<ReadRangeOutput>, AnyError> {
Ok(self.snapshot_read(requests, options).await?)
}
async fn dyn_atomic_write(
&self,
write: AtomicWrite,
) -> Result<Option<CommitResult>, AnyError> {
Ok(self.atomic_write(write).await?)
}
async fn dyn_dequeue_next_message(
&self,
) -> Result<Option<Box<dyn QueueMessageHandle>>, AnyError> {
Ok(
self
.dequeue_next_message()
.await?
.map(|x| Box::new(x) as Box<dyn QueueMessageHandle>),
)
}
fn dyn_watch(&self, keys: Vec<Vec<u8>>) -> WatchStream {
self.watch(keys)
}
fn dyn_close(&self) {
self.close()
}
}
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