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// Sonic
//
// Fast, lightweight and schema-less search backend
// Copyright: 2019, Valerian Saliou <valerian@valeriansaliou.name>
// License: Mozilla Public License v2.0 (MPL v2.0)
use crate::store::fst::StoreFSTActionBuilder;
use crate::store::item::StoreItem;
use crate::store::kv::{StoreKVAcquireMode, StoreKVActionBuilder, StoreKVPool};
pub struct ExecutorFlushB;
impl ExecutorFlushB {
pub fn execute(store: StoreItem) -> Result<u32, ()> {
if let StoreItem(collection, Some(bucket), None) = store {
// Important: acquire database access read lock, and reference it in context. This \
// prevents the database from being erased while using it in this block.
// Notice: acquire FST lock in write mode, as we will erase it.
general_kv_access_lock_read!();
general_fst_access_lock_write!();
if let Ok(kv_store) = StoreKVPool::acquire(StoreKVAcquireMode::OpenOnly, collection) {
// Important: acquire bucket store write lock
executor_kv_lock_write!(kv_store);
if kv_store.is_some() {
// Store exists, proceed erasure.
debug!(
"collection store exists, erasing: {} from {}",
bucket.as_str(),
collection.as_str()
);
let kv_action = StoreKVActionBuilder::access(bucket, kv_store);
// Notice: we cannot use the provided KV bucket erasure helper there, as \
// erasing a bucket requires a database lock, which would incur a dead-lock, \
// thus we need to perform the erasure from there.
if let Ok(erase_count) = kv_action.batch_erase_bucket() {
if StoreFSTActionBuilder::erase(collection, Some(bucket)).is_ok() {
debug!("done with bucket erasure");
return Ok(erase_count);
}
}
} else {
// Store does not exist, consider as already erased.
debug!(
"collection store does not exist, consider {} from {} already erased",
bucket.as_str(),
collection.as_str()
);
return Ok(0);
}
}
}
Err(())
}
}